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4568 lines
122 KiB
4568 lines
122 KiB
// SPDX-License-Identifier: GPL-2.0 |
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#include <linux/ceph/ceph_debug.h> |
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|
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#include <linux/fs.h> |
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#include <linux/kernel.h> |
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#include <linux/sched/signal.h> |
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#include <linux/slab.h> |
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#include <linux/vmalloc.h> |
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#include <linux/wait.h> |
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#include <linux/writeback.h> |
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#include <linux/iversion.h> |
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|
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#include "super.h" |
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#include "mds_client.h" |
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#include "cache.h" |
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#include <linux/ceph/decode.h> |
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#include <linux/ceph/messenger.h> |
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|
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/* |
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* Capability management |
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* |
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* The Ceph metadata servers control client access to inode metadata |
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* and file data by issuing capabilities, granting clients permission |
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* to read and/or write both inode field and file data to OSDs |
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* (storage nodes). Each capability consists of a set of bits |
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* indicating which operations are allowed. |
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* |
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* If the client holds a *_SHARED cap, the client has a coherent value |
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* that can be safely read from the cached inode. |
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* |
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* In the case of a *_EXCL (exclusive) or FILE_WR capabilities, the |
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* client is allowed to change inode attributes (e.g., file size, |
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* mtime), note its dirty state in the ceph_cap, and asynchronously |
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* flush that metadata change to the MDS. |
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* |
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* In the event of a conflicting operation (perhaps by another |
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* client), the MDS will revoke the conflicting client capabilities. |
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* |
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* In order for a client to cache an inode, it must hold a capability |
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* with at least one MDS server. When inodes are released, release |
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* notifications are batched and periodically sent en masse to the MDS |
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* cluster to release server state. |
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*/ |
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|
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static u64 __get_oldest_flush_tid(struct ceph_mds_client *mdsc); |
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static void __kick_flushing_caps(struct ceph_mds_client *mdsc, |
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struct ceph_mds_session *session, |
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struct ceph_inode_info *ci, |
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u64 oldest_flush_tid); |
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|
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/* |
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* Generate readable cap strings for debugging output. |
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*/ |
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#define MAX_CAP_STR 20 |
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static char cap_str[MAX_CAP_STR][40]; |
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static DEFINE_SPINLOCK(cap_str_lock); |
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static int last_cap_str; |
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|
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static char *gcap_string(char *s, int c) |
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{ |
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if (c & CEPH_CAP_GSHARED) |
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*s++ = 's'; |
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if (c & CEPH_CAP_GEXCL) |
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*s++ = 'x'; |
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if (c & CEPH_CAP_GCACHE) |
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*s++ = 'c'; |
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if (c & CEPH_CAP_GRD) |
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*s++ = 'r'; |
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if (c & CEPH_CAP_GWR) |
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*s++ = 'w'; |
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if (c & CEPH_CAP_GBUFFER) |
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*s++ = 'b'; |
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if (c & CEPH_CAP_GWREXTEND) |
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*s++ = 'a'; |
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if (c & CEPH_CAP_GLAZYIO) |
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*s++ = 'l'; |
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return s; |
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} |
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|
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const char *ceph_cap_string(int caps) |
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{ |
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int i; |
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char *s; |
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int c; |
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|
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spin_lock(&cap_str_lock); |
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i = last_cap_str++; |
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if (last_cap_str == MAX_CAP_STR) |
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last_cap_str = 0; |
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spin_unlock(&cap_str_lock); |
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|
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s = cap_str[i]; |
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|
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if (caps & CEPH_CAP_PIN) |
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*s++ = 'p'; |
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|
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c = (caps >> CEPH_CAP_SAUTH) & 3; |
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if (c) { |
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*s++ = 'A'; |
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s = gcap_string(s, c); |
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} |
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|
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c = (caps >> CEPH_CAP_SLINK) & 3; |
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if (c) { |
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*s++ = 'L'; |
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s = gcap_string(s, c); |
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} |
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|
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c = (caps >> CEPH_CAP_SXATTR) & 3; |
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if (c) { |
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*s++ = 'X'; |
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s = gcap_string(s, c); |
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} |
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|
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c = caps >> CEPH_CAP_SFILE; |
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if (c) { |
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*s++ = 'F'; |
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s = gcap_string(s, c); |
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} |
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|
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if (s == cap_str[i]) |
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*s++ = '-'; |
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*s = 0; |
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return cap_str[i]; |
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} |
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|
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void ceph_caps_init(struct ceph_mds_client *mdsc) |
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{ |
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INIT_LIST_HEAD(&mdsc->caps_list); |
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spin_lock_init(&mdsc->caps_list_lock); |
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} |
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|
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void ceph_caps_finalize(struct ceph_mds_client *mdsc) |
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{ |
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struct ceph_cap *cap; |
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|
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spin_lock(&mdsc->caps_list_lock); |
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while (!list_empty(&mdsc->caps_list)) { |
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cap = list_first_entry(&mdsc->caps_list, |
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struct ceph_cap, caps_item); |
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list_del(&cap->caps_item); |
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kmem_cache_free(ceph_cap_cachep, cap); |
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} |
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mdsc->caps_total_count = 0; |
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mdsc->caps_avail_count = 0; |
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mdsc->caps_use_count = 0; |
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mdsc->caps_reserve_count = 0; |
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mdsc->caps_min_count = 0; |
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spin_unlock(&mdsc->caps_list_lock); |
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} |
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|
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void ceph_adjust_caps_max_min(struct ceph_mds_client *mdsc, |
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struct ceph_mount_options *fsopt) |
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{ |
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spin_lock(&mdsc->caps_list_lock); |
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mdsc->caps_min_count = fsopt->max_readdir; |
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if (mdsc->caps_min_count < 1024) |
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mdsc->caps_min_count = 1024; |
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mdsc->caps_use_max = fsopt->caps_max; |
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if (mdsc->caps_use_max > 0 && |
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mdsc->caps_use_max < mdsc->caps_min_count) |
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mdsc->caps_use_max = mdsc->caps_min_count; |
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spin_unlock(&mdsc->caps_list_lock); |
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} |
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|
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static void __ceph_unreserve_caps(struct ceph_mds_client *mdsc, int nr_caps) |
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{ |
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struct ceph_cap *cap; |
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int i; |
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|
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if (nr_caps) { |
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BUG_ON(mdsc->caps_reserve_count < nr_caps); |
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mdsc->caps_reserve_count -= nr_caps; |
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if (mdsc->caps_avail_count >= |
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mdsc->caps_reserve_count + mdsc->caps_min_count) { |
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mdsc->caps_total_count -= nr_caps; |
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for (i = 0; i < nr_caps; i++) { |
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cap = list_first_entry(&mdsc->caps_list, |
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struct ceph_cap, caps_item); |
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list_del(&cap->caps_item); |
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kmem_cache_free(ceph_cap_cachep, cap); |
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} |
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} else { |
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mdsc->caps_avail_count += nr_caps; |
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} |
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|
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dout("%s: caps %d = %d used + %d resv + %d avail\n", |
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__func__, |
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mdsc->caps_total_count, mdsc->caps_use_count, |
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mdsc->caps_reserve_count, mdsc->caps_avail_count); |
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BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count + |
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mdsc->caps_reserve_count + |
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mdsc->caps_avail_count); |
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} |
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} |
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|
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/* |
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* Called under mdsc->mutex. |
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*/ |
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int ceph_reserve_caps(struct ceph_mds_client *mdsc, |
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struct ceph_cap_reservation *ctx, int need) |
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{ |
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int i, j; |
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struct ceph_cap *cap; |
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int have; |
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int alloc = 0; |
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int max_caps; |
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int err = 0; |
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bool trimmed = false; |
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struct ceph_mds_session *s; |
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LIST_HEAD(newcaps); |
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|
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dout("reserve caps ctx=%p need=%d\n", ctx, need); |
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|
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/* first reserve any caps that are already allocated */ |
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spin_lock(&mdsc->caps_list_lock); |
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if (mdsc->caps_avail_count >= need) |
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have = need; |
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else |
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have = mdsc->caps_avail_count; |
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mdsc->caps_avail_count -= have; |
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mdsc->caps_reserve_count += have; |
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BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count + |
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mdsc->caps_reserve_count + |
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mdsc->caps_avail_count); |
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spin_unlock(&mdsc->caps_list_lock); |
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|
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for (i = have; i < need; ) { |
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cap = kmem_cache_alloc(ceph_cap_cachep, GFP_NOFS); |
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if (cap) { |
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list_add(&cap->caps_item, &newcaps); |
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alloc++; |
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i++; |
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continue; |
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} |
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|
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if (!trimmed) { |
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for (j = 0; j < mdsc->max_sessions; j++) { |
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s = __ceph_lookup_mds_session(mdsc, j); |
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if (!s) |
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continue; |
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mutex_unlock(&mdsc->mutex); |
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|
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mutex_lock(&s->s_mutex); |
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max_caps = s->s_nr_caps - (need - i); |
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ceph_trim_caps(mdsc, s, max_caps); |
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mutex_unlock(&s->s_mutex); |
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|
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ceph_put_mds_session(s); |
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mutex_lock(&mdsc->mutex); |
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} |
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trimmed = true; |
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|
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spin_lock(&mdsc->caps_list_lock); |
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if (mdsc->caps_avail_count) { |
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int more_have; |
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if (mdsc->caps_avail_count >= need - i) |
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more_have = need - i; |
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else |
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more_have = mdsc->caps_avail_count; |
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|
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i += more_have; |
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have += more_have; |
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mdsc->caps_avail_count -= more_have; |
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mdsc->caps_reserve_count += more_have; |
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|
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} |
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spin_unlock(&mdsc->caps_list_lock); |
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|
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continue; |
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} |
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|
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pr_warn("reserve caps ctx=%p ENOMEM need=%d got=%d\n", |
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ctx, need, have + alloc); |
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err = -ENOMEM; |
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break; |
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} |
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|
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if (!err) { |
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BUG_ON(have + alloc != need); |
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ctx->count = need; |
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ctx->used = 0; |
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} |
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|
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spin_lock(&mdsc->caps_list_lock); |
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mdsc->caps_total_count += alloc; |
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mdsc->caps_reserve_count += alloc; |
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list_splice(&newcaps, &mdsc->caps_list); |
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|
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BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count + |
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mdsc->caps_reserve_count + |
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mdsc->caps_avail_count); |
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|
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if (err) |
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__ceph_unreserve_caps(mdsc, have + alloc); |
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|
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spin_unlock(&mdsc->caps_list_lock); |
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|
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dout("reserve caps ctx=%p %d = %d used + %d resv + %d avail\n", |
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ctx, mdsc->caps_total_count, mdsc->caps_use_count, |
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mdsc->caps_reserve_count, mdsc->caps_avail_count); |
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return err; |
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} |
|
|
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void ceph_unreserve_caps(struct ceph_mds_client *mdsc, |
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struct ceph_cap_reservation *ctx) |
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{ |
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bool reclaim = false; |
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if (!ctx->count) |
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return; |
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|
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dout("unreserve caps ctx=%p count=%d\n", ctx, ctx->count); |
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spin_lock(&mdsc->caps_list_lock); |
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__ceph_unreserve_caps(mdsc, ctx->count); |
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ctx->count = 0; |
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|
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if (mdsc->caps_use_max > 0 && |
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mdsc->caps_use_count > mdsc->caps_use_max) |
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reclaim = true; |
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spin_unlock(&mdsc->caps_list_lock); |
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|
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if (reclaim) |
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ceph_reclaim_caps_nr(mdsc, ctx->used); |
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} |
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|
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struct ceph_cap *ceph_get_cap(struct ceph_mds_client *mdsc, |
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struct ceph_cap_reservation *ctx) |
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{ |
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struct ceph_cap *cap = NULL; |
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|
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/* temporary, until we do something about cap import/export */ |
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if (!ctx) { |
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cap = kmem_cache_alloc(ceph_cap_cachep, GFP_NOFS); |
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if (cap) { |
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spin_lock(&mdsc->caps_list_lock); |
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mdsc->caps_use_count++; |
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mdsc->caps_total_count++; |
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spin_unlock(&mdsc->caps_list_lock); |
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} else { |
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spin_lock(&mdsc->caps_list_lock); |
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if (mdsc->caps_avail_count) { |
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BUG_ON(list_empty(&mdsc->caps_list)); |
|
|
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mdsc->caps_avail_count--; |
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mdsc->caps_use_count++; |
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cap = list_first_entry(&mdsc->caps_list, |
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struct ceph_cap, caps_item); |
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list_del(&cap->caps_item); |
|
|
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BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count + |
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mdsc->caps_reserve_count + mdsc->caps_avail_count); |
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} |
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spin_unlock(&mdsc->caps_list_lock); |
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} |
|
|
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return cap; |
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} |
|
|
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spin_lock(&mdsc->caps_list_lock); |
|
dout("get_cap ctx=%p (%d) %d = %d used + %d resv + %d avail\n", |
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ctx, ctx->count, mdsc->caps_total_count, mdsc->caps_use_count, |
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mdsc->caps_reserve_count, mdsc->caps_avail_count); |
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BUG_ON(!ctx->count); |
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BUG_ON(ctx->count > mdsc->caps_reserve_count); |
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BUG_ON(list_empty(&mdsc->caps_list)); |
|
|
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ctx->count--; |
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ctx->used++; |
|
mdsc->caps_reserve_count--; |
|
mdsc->caps_use_count++; |
|
|
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cap = list_first_entry(&mdsc->caps_list, struct ceph_cap, caps_item); |
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list_del(&cap->caps_item); |
|
|
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BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count + |
|
mdsc->caps_reserve_count + mdsc->caps_avail_count); |
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spin_unlock(&mdsc->caps_list_lock); |
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return cap; |
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} |
|
|
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void ceph_put_cap(struct ceph_mds_client *mdsc, struct ceph_cap *cap) |
|
{ |
|
spin_lock(&mdsc->caps_list_lock); |
|
dout("put_cap %p %d = %d used + %d resv + %d avail\n", |
|
cap, mdsc->caps_total_count, mdsc->caps_use_count, |
|
mdsc->caps_reserve_count, mdsc->caps_avail_count); |
|
mdsc->caps_use_count--; |
|
/* |
|
* Keep some preallocated caps around (ceph_min_count), to |
|
* avoid lots of free/alloc churn. |
|
*/ |
|
if (mdsc->caps_avail_count >= mdsc->caps_reserve_count + |
|
mdsc->caps_min_count) { |
|
mdsc->caps_total_count--; |
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kmem_cache_free(ceph_cap_cachep, cap); |
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} else { |
|
mdsc->caps_avail_count++; |
|
list_add(&cap->caps_item, &mdsc->caps_list); |
|
} |
|
|
|
BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count + |
|
mdsc->caps_reserve_count + mdsc->caps_avail_count); |
|
spin_unlock(&mdsc->caps_list_lock); |
|
} |
|
|
|
void ceph_reservation_status(struct ceph_fs_client *fsc, |
|
int *total, int *avail, int *used, int *reserved, |
|
int *min) |
|
{ |
|
struct ceph_mds_client *mdsc = fsc->mdsc; |
|
|
|
spin_lock(&mdsc->caps_list_lock); |
|
|
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if (total) |
|
*total = mdsc->caps_total_count; |
|
if (avail) |
|
*avail = mdsc->caps_avail_count; |
|
if (used) |
|
*used = mdsc->caps_use_count; |
|
if (reserved) |
|
*reserved = mdsc->caps_reserve_count; |
|
if (min) |
|
*min = mdsc->caps_min_count; |
|
|
|
spin_unlock(&mdsc->caps_list_lock); |
|
} |
|
|
|
/* |
|
* Find ceph_cap for given mds, if any. |
|
* |
|
* Called with i_ceph_lock held. |
|
*/ |
|
static struct ceph_cap *__get_cap_for_mds(struct ceph_inode_info *ci, int mds) |
|
{ |
|
struct ceph_cap *cap; |
|
struct rb_node *n = ci->i_caps.rb_node; |
|
|
|
while (n) { |
|
cap = rb_entry(n, struct ceph_cap, ci_node); |
|
if (mds < cap->mds) |
|
n = n->rb_left; |
|
else if (mds > cap->mds) |
|
n = n->rb_right; |
|
else |
|
return cap; |
|
} |
|
return NULL; |
|
} |
|
|
|
struct ceph_cap *ceph_get_cap_for_mds(struct ceph_inode_info *ci, int mds) |
|
{ |
|
struct ceph_cap *cap; |
|
|
|
spin_lock(&ci->i_ceph_lock); |
|
cap = __get_cap_for_mds(ci, mds); |
|
spin_unlock(&ci->i_ceph_lock); |
|
return cap; |
|
} |
|
|
|
/* |
|
* Called under i_ceph_lock. |
|
*/ |
|
static void __insert_cap_node(struct ceph_inode_info *ci, |
|
struct ceph_cap *new) |
|
{ |
|
struct rb_node **p = &ci->i_caps.rb_node; |
|
struct rb_node *parent = NULL; |
|
struct ceph_cap *cap = NULL; |
|
|
|
while (*p) { |
|
parent = *p; |
|
cap = rb_entry(parent, struct ceph_cap, ci_node); |
|
if (new->mds < cap->mds) |
|
p = &(*p)->rb_left; |
|
else if (new->mds > cap->mds) |
|
p = &(*p)->rb_right; |
|
else |
|
BUG(); |
|
} |
|
|
|
rb_link_node(&new->ci_node, parent, p); |
|
rb_insert_color(&new->ci_node, &ci->i_caps); |
|
} |
|
|
|
/* |
|
* (re)set cap hold timeouts, which control the delayed release |
|
* of unused caps back to the MDS. Should be called on cap use. |
|
*/ |
|
static void __cap_set_timeouts(struct ceph_mds_client *mdsc, |
|
struct ceph_inode_info *ci) |
|
{ |
|
struct ceph_mount_options *opt = mdsc->fsc->mount_options; |
|
ci->i_hold_caps_max = round_jiffies(jiffies + |
|
opt->caps_wanted_delay_max * HZ); |
|
dout("__cap_set_timeouts %p %lu\n", &ci->vfs_inode, |
|
ci->i_hold_caps_max - jiffies); |
|
} |
|
|
|
/* |
|
* (Re)queue cap at the end of the delayed cap release list. |
|
* |
|
* If I_FLUSH is set, leave the inode at the front of the list. |
|
* |
|
* Caller holds i_ceph_lock |
|
* -> we take mdsc->cap_delay_lock |
|
*/ |
|
static void __cap_delay_requeue(struct ceph_mds_client *mdsc, |
|
struct ceph_inode_info *ci) |
|
{ |
|
dout("__cap_delay_requeue %p flags 0x%lx at %lu\n", &ci->vfs_inode, |
|
ci->i_ceph_flags, ci->i_hold_caps_max); |
|
if (!mdsc->stopping) { |
|
spin_lock(&mdsc->cap_delay_lock); |
|
if (!list_empty(&ci->i_cap_delay_list)) { |
|
if (ci->i_ceph_flags & CEPH_I_FLUSH) |
|
goto no_change; |
|
list_del_init(&ci->i_cap_delay_list); |
|
} |
|
__cap_set_timeouts(mdsc, ci); |
|
list_add_tail(&ci->i_cap_delay_list, &mdsc->cap_delay_list); |
|
no_change: |
|
spin_unlock(&mdsc->cap_delay_lock); |
|
} |
|
} |
|
|
|
/* |
|
* Queue an inode for immediate writeback. Mark inode with I_FLUSH, |
|
* indicating we should send a cap message to flush dirty metadata |
|
* asap, and move to the front of the delayed cap list. |
|
*/ |
|
static void __cap_delay_requeue_front(struct ceph_mds_client *mdsc, |
|
struct ceph_inode_info *ci) |
|
{ |
|
dout("__cap_delay_requeue_front %p\n", &ci->vfs_inode); |
|
spin_lock(&mdsc->cap_delay_lock); |
|
ci->i_ceph_flags |= CEPH_I_FLUSH; |
|
if (!list_empty(&ci->i_cap_delay_list)) |
|
list_del_init(&ci->i_cap_delay_list); |
|
list_add(&ci->i_cap_delay_list, &mdsc->cap_delay_list); |
|
spin_unlock(&mdsc->cap_delay_lock); |
|
} |
|
|
|
/* |
|
* Cancel delayed work on cap. |
|
* |
|
* Caller must hold i_ceph_lock. |
|
*/ |
|
static void __cap_delay_cancel(struct ceph_mds_client *mdsc, |
|
struct ceph_inode_info *ci) |
|
{ |
|
dout("__cap_delay_cancel %p\n", &ci->vfs_inode); |
|
if (list_empty(&ci->i_cap_delay_list)) |
|
return; |
|
spin_lock(&mdsc->cap_delay_lock); |
|
list_del_init(&ci->i_cap_delay_list); |
|
spin_unlock(&mdsc->cap_delay_lock); |
|
} |
|
|
|
/* Common issue checks for add_cap, handle_cap_grant. */ |
|
static void __check_cap_issue(struct ceph_inode_info *ci, struct ceph_cap *cap, |
|
unsigned issued) |
|
{ |
|
unsigned had = __ceph_caps_issued(ci, NULL); |
|
|
|
lockdep_assert_held(&ci->i_ceph_lock); |
|
|
|
/* |
|
* Each time we receive FILE_CACHE anew, we increment |
|
* i_rdcache_gen. |
|
*/ |
|
if (S_ISREG(ci->vfs_inode.i_mode) && |
|
(issued & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) && |
|
(had & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) == 0) { |
|
ci->i_rdcache_gen++; |
|
} |
|
|
|
/* |
|
* If FILE_SHARED is newly issued, mark dir not complete. We don't |
|
* know what happened to this directory while we didn't have the cap. |
|
* If FILE_SHARED is being revoked, also mark dir not complete. It |
|
* stops on-going cached readdir. |
|
*/ |
|
if ((issued & CEPH_CAP_FILE_SHARED) != (had & CEPH_CAP_FILE_SHARED)) { |
|
if (issued & CEPH_CAP_FILE_SHARED) |
|
atomic_inc(&ci->i_shared_gen); |
|
if (S_ISDIR(ci->vfs_inode.i_mode)) { |
|
dout(" marking %p NOT complete\n", &ci->vfs_inode); |
|
__ceph_dir_clear_complete(ci); |
|
} |
|
} |
|
|
|
/* Wipe saved layout if we're losing DIR_CREATE caps */ |
|
if (S_ISDIR(ci->vfs_inode.i_mode) && (had & CEPH_CAP_DIR_CREATE) && |
|
!(issued & CEPH_CAP_DIR_CREATE)) { |
|
ceph_put_string(rcu_dereference_raw(ci->i_cached_layout.pool_ns)); |
|
memset(&ci->i_cached_layout, 0, sizeof(ci->i_cached_layout)); |
|
} |
|
} |
|
|
|
/** |
|
* change_auth_cap_ses - move inode to appropriate lists when auth caps change |
|
* @ci: inode to be moved |
|
* @session: new auth caps session |
|
*/ |
|
static void change_auth_cap_ses(struct ceph_inode_info *ci, |
|
struct ceph_mds_session *session) |
|
{ |
|
lockdep_assert_held(&ci->i_ceph_lock); |
|
|
|
if (list_empty(&ci->i_dirty_item) && list_empty(&ci->i_flushing_item)) |
|
return; |
|
|
|
spin_lock(&session->s_mdsc->cap_dirty_lock); |
|
if (!list_empty(&ci->i_dirty_item)) |
|
list_move(&ci->i_dirty_item, &session->s_cap_dirty); |
|
if (!list_empty(&ci->i_flushing_item)) |
|
list_move_tail(&ci->i_flushing_item, &session->s_cap_flushing); |
|
spin_unlock(&session->s_mdsc->cap_dirty_lock); |
|
} |
|
|
|
/* |
|
* Add a capability under the given MDS session. |
|
* |
|
* Caller should hold session snap_rwsem (read) and ci->i_ceph_lock |
|
* |
|
* @fmode is the open file mode, if we are opening a file, otherwise |
|
* it is < 0. (This is so we can atomically add the cap and add an |
|
* open file reference to it.) |
|
*/ |
|
void ceph_add_cap(struct inode *inode, |
|
struct ceph_mds_session *session, u64 cap_id, |
|
unsigned issued, unsigned wanted, |
|
unsigned seq, unsigned mseq, u64 realmino, int flags, |
|
struct ceph_cap **new_cap) |
|
{ |
|
struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc; |
|
struct ceph_inode_info *ci = ceph_inode(inode); |
|
struct ceph_cap *cap; |
|
int mds = session->s_mds; |
|
int actual_wanted; |
|
u32 gen; |
|
|
|
lockdep_assert_held(&ci->i_ceph_lock); |
|
|
|
dout("add_cap %p mds%d cap %llx %s seq %d\n", inode, |
|
session->s_mds, cap_id, ceph_cap_string(issued), seq); |
|
|
|
gen = atomic_read(&session->s_cap_gen); |
|
|
|
cap = __get_cap_for_mds(ci, mds); |
|
if (!cap) { |
|
cap = *new_cap; |
|
*new_cap = NULL; |
|
|
|
cap->issued = 0; |
|
cap->implemented = 0; |
|
cap->mds = mds; |
|
cap->mds_wanted = 0; |
|
cap->mseq = 0; |
|
|
|
cap->ci = ci; |
|
__insert_cap_node(ci, cap); |
|
|
|
/* add to session cap list */ |
|
cap->session = session; |
|
spin_lock(&session->s_cap_lock); |
|
list_add_tail(&cap->session_caps, &session->s_caps); |
|
session->s_nr_caps++; |
|
atomic64_inc(&mdsc->metric.total_caps); |
|
spin_unlock(&session->s_cap_lock); |
|
} else { |
|
spin_lock(&session->s_cap_lock); |
|
list_move_tail(&cap->session_caps, &session->s_caps); |
|
spin_unlock(&session->s_cap_lock); |
|
|
|
if (cap->cap_gen < gen) |
|
cap->issued = cap->implemented = CEPH_CAP_PIN; |
|
|
|
/* |
|
* auth mds of the inode changed. we received the cap export |
|
* message, but still haven't received the cap import message. |
|
* handle_cap_export() updated the new auth MDS' cap. |
|
* |
|
* "ceph_seq_cmp(seq, cap->seq) <= 0" means we are processing |
|
* a message that was send before the cap import message. So |
|
* don't remove caps. |
|
*/ |
|
if (ceph_seq_cmp(seq, cap->seq) <= 0) { |
|
WARN_ON(cap != ci->i_auth_cap); |
|
WARN_ON(cap->cap_id != cap_id); |
|
seq = cap->seq; |
|
mseq = cap->mseq; |
|
issued |= cap->issued; |
|
flags |= CEPH_CAP_FLAG_AUTH; |
|
} |
|
} |
|
|
|
if (!ci->i_snap_realm || |
|
((flags & CEPH_CAP_FLAG_AUTH) && |
|
realmino != (u64)-1 && ci->i_snap_realm->ino != realmino)) { |
|
/* |
|
* add this inode to the appropriate snap realm |
|
*/ |
|
struct ceph_snap_realm *realm = ceph_lookup_snap_realm(mdsc, |
|
realmino); |
|
if (realm) |
|
ceph_change_snap_realm(inode, realm); |
|
else |
|
WARN(1, "%s: couldn't find snap realm 0x%llx (ino 0x%llx oldrealm 0x%llx)\n", |
|
__func__, realmino, ci->i_vino.ino, |
|
ci->i_snap_realm ? ci->i_snap_realm->ino : 0); |
|
} |
|
|
|
__check_cap_issue(ci, cap, issued); |
|
|
|
/* |
|
* If we are issued caps we don't want, or the mds' wanted |
|
* value appears to be off, queue a check so we'll release |
|
* later and/or update the mds wanted value. |
|
*/ |
|
actual_wanted = __ceph_caps_wanted(ci); |
|
if ((wanted & ~actual_wanted) || |
|
(issued & ~actual_wanted & CEPH_CAP_ANY_WR)) { |
|
dout(" issued %s, mds wanted %s, actual %s, queueing\n", |
|
ceph_cap_string(issued), ceph_cap_string(wanted), |
|
ceph_cap_string(actual_wanted)); |
|
__cap_delay_requeue(mdsc, ci); |
|
} |
|
|
|
if (flags & CEPH_CAP_FLAG_AUTH) { |
|
if (!ci->i_auth_cap || |
|
ceph_seq_cmp(ci->i_auth_cap->mseq, mseq) < 0) { |
|
if (ci->i_auth_cap && |
|
ci->i_auth_cap->session != cap->session) |
|
change_auth_cap_ses(ci, cap->session); |
|
ci->i_auth_cap = cap; |
|
cap->mds_wanted = wanted; |
|
} |
|
} else { |
|
WARN_ON(ci->i_auth_cap == cap); |
|
} |
|
|
|
dout("add_cap inode %p (%llx.%llx) cap %p %s now %s seq %d mds%d\n", |
|
inode, ceph_vinop(inode), cap, ceph_cap_string(issued), |
|
ceph_cap_string(issued|cap->issued), seq, mds); |
|
cap->cap_id = cap_id; |
|
cap->issued = issued; |
|
cap->implemented |= issued; |
|
if (ceph_seq_cmp(mseq, cap->mseq) > 0) |
|
cap->mds_wanted = wanted; |
|
else |
|
cap->mds_wanted |= wanted; |
|
cap->seq = seq; |
|
cap->issue_seq = seq; |
|
cap->mseq = mseq; |
|
cap->cap_gen = gen; |
|
} |
|
|
|
/* |
|
* Return true if cap has not timed out and belongs to the current |
|
* generation of the MDS session (i.e. has not gone 'stale' due to |
|
* us losing touch with the mds). |
|
*/ |
|
static int __cap_is_valid(struct ceph_cap *cap) |
|
{ |
|
unsigned long ttl; |
|
u32 gen; |
|
|
|
gen = atomic_read(&cap->session->s_cap_gen); |
|
ttl = cap->session->s_cap_ttl; |
|
|
|
if (cap->cap_gen < gen || time_after_eq(jiffies, ttl)) { |
|
dout("__cap_is_valid %p cap %p issued %s " |
|
"but STALE (gen %u vs %u)\n", &cap->ci->vfs_inode, |
|
cap, ceph_cap_string(cap->issued), cap->cap_gen, gen); |
|
return 0; |
|
} |
|
|
|
return 1; |
|
} |
|
|
|
/* |
|
* Return set of valid cap bits issued to us. Note that caps time |
|
* out, and may be invalidated in bulk if the client session times out |
|
* and session->s_cap_gen is bumped. |
|
*/ |
|
int __ceph_caps_issued(struct ceph_inode_info *ci, int *implemented) |
|
{ |
|
int have = ci->i_snap_caps; |
|
struct ceph_cap *cap; |
|
struct rb_node *p; |
|
|
|
if (implemented) |
|
*implemented = 0; |
|
for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) { |
|
cap = rb_entry(p, struct ceph_cap, ci_node); |
|
if (!__cap_is_valid(cap)) |
|
continue; |
|
dout("__ceph_caps_issued %p cap %p issued %s\n", |
|
&ci->vfs_inode, cap, ceph_cap_string(cap->issued)); |
|
have |= cap->issued; |
|
if (implemented) |
|
*implemented |= cap->implemented; |
|
} |
|
/* |
|
* exclude caps issued by non-auth MDS, but are been revoking |
|
* by the auth MDS. The non-auth MDS should be revoking/exporting |
|
* these caps, but the message is delayed. |
|
*/ |
|
if (ci->i_auth_cap) { |
|
cap = ci->i_auth_cap; |
|
have &= ~cap->implemented | cap->issued; |
|
} |
|
return have; |
|
} |
|
|
|
/* |
|
* Get cap bits issued by caps other than @ocap |
|
*/ |
|
int __ceph_caps_issued_other(struct ceph_inode_info *ci, struct ceph_cap *ocap) |
|
{ |
|
int have = ci->i_snap_caps; |
|
struct ceph_cap *cap; |
|
struct rb_node *p; |
|
|
|
for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) { |
|
cap = rb_entry(p, struct ceph_cap, ci_node); |
|
if (cap == ocap) |
|
continue; |
|
if (!__cap_is_valid(cap)) |
|
continue; |
|
have |= cap->issued; |
|
} |
|
return have; |
|
} |
|
|
|
/* |
|
* Move a cap to the end of the LRU (oldest caps at list head, newest |
|
* at list tail). |
|
*/ |
|
static void __touch_cap(struct ceph_cap *cap) |
|
{ |
|
struct ceph_mds_session *s = cap->session; |
|
|
|
spin_lock(&s->s_cap_lock); |
|
if (!s->s_cap_iterator) { |
|
dout("__touch_cap %p cap %p mds%d\n", &cap->ci->vfs_inode, cap, |
|
s->s_mds); |
|
list_move_tail(&cap->session_caps, &s->s_caps); |
|
} else { |
|
dout("__touch_cap %p cap %p mds%d NOP, iterating over caps\n", |
|
&cap->ci->vfs_inode, cap, s->s_mds); |
|
} |
|
spin_unlock(&s->s_cap_lock); |
|
} |
|
|
|
/* |
|
* Check if we hold the given mask. If so, move the cap(s) to the |
|
* front of their respective LRUs. (This is the preferred way for |
|
* callers to check for caps they want.) |
|
*/ |
|
int __ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, int touch) |
|
{ |
|
struct ceph_cap *cap; |
|
struct rb_node *p; |
|
int have = ci->i_snap_caps; |
|
|
|
if ((have & mask) == mask) { |
|
dout("__ceph_caps_issued_mask ino 0x%llx snap issued %s" |
|
" (mask %s)\n", ceph_ino(&ci->vfs_inode), |
|
ceph_cap_string(have), |
|
ceph_cap_string(mask)); |
|
return 1; |
|
} |
|
|
|
for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) { |
|
cap = rb_entry(p, struct ceph_cap, ci_node); |
|
if (!__cap_is_valid(cap)) |
|
continue; |
|
if ((cap->issued & mask) == mask) { |
|
dout("__ceph_caps_issued_mask ino 0x%llx cap %p issued %s" |
|
" (mask %s)\n", ceph_ino(&ci->vfs_inode), cap, |
|
ceph_cap_string(cap->issued), |
|
ceph_cap_string(mask)); |
|
if (touch) |
|
__touch_cap(cap); |
|
return 1; |
|
} |
|
|
|
/* does a combination of caps satisfy mask? */ |
|
have |= cap->issued; |
|
if ((have & mask) == mask) { |
|
dout("__ceph_caps_issued_mask ino 0x%llx combo issued %s" |
|
" (mask %s)\n", ceph_ino(&ci->vfs_inode), |
|
ceph_cap_string(cap->issued), |
|
ceph_cap_string(mask)); |
|
if (touch) { |
|
struct rb_node *q; |
|
|
|
/* touch this + preceding caps */ |
|
__touch_cap(cap); |
|
for (q = rb_first(&ci->i_caps); q != p; |
|
q = rb_next(q)) { |
|
cap = rb_entry(q, struct ceph_cap, |
|
ci_node); |
|
if (!__cap_is_valid(cap)) |
|
continue; |
|
if (cap->issued & mask) |
|
__touch_cap(cap); |
|
} |
|
} |
|
return 1; |
|
} |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
int __ceph_caps_issued_mask_metric(struct ceph_inode_info *ci, int mask, |
|
int touch) |
|
{ |
|
struct ceph_fs_client *fsc = ceph_sb_to_client(ci->vfs_inode.i_sb); |
|
int r; |
|
|
|
r = __ceph_caps_issued_mask(ci, mask, touch); |
|
if (r) |
|
ceph_update_cap_hit(&fsc->mdsc->metric); |
|
else |
|
ceph_update_cap_mis(&fsc->mdsc->metric); |
|
return r; |
|
} |
|
|
|
/* |
|
* Return true if mask caps are currently being revoked by an MDS. |
|
*/ |
|
int __ceph_caps_revoking_other(struct ceph_inode_info *ci, |
|
struct ceph_cap *ocap, int mask) |
|
{ |
|
struct ceph_cap *cap; |
|
struct rb_node *p; |
|
|
|
for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) { |
|
cap = rb_entry(p, struct ceph_cap, ci_node); |
|
if (cap != ocap && |
|
(cap->implemented & ~cap->issued & mask)) |
|
return 1; |
|
} |
|
return 0; |
|
} |
|
|
|
int ceph_caps_revoking(struct ceph_inode_info *ci, int mask) |
|
{ |
|
struct inode *inode = &ci->vfs_inode; |
|
int ret; |
|
|
|
spin_lock(&ci->i_ceph_lock); |
|
ret = __ceph_caps_revoking_other(ci, NULL, mask); |
|
spin_unlock(&ci->i_ceph_lock); |
|
dout("ceph_caps_revoking %p %s = %d\n", inode, |
|
ceph_cap_string(mask), ret); |
|
return ret; |
|
} |
|
|
|
int __ceph_caps_used(struct ceph_inode_info *ci) |
|
{ |
|
int used = 0; |
|
if (ci->i_pin_ref) |
|
used |= CEPH_CAP_PIN; |
|
if (ci->i_rd_ref) |
|
used |= CEPH_CAP_FILE_RD; |
|
if (ci->i_rdcache_ref || |
|
(S_ISREG(ci->vfs_inode.i_mode) && |
|
ci->vfs_inode.i_data.nrpages)) |
|
used |= CEPH_CAP_FILE_CACHE; |
|
if (ci->i_wr_ref) |
|
used |= CEPH_CAP_FILE_WR; |
|
if (ci->i_wb_ref || ci->i_wrbuffer_ref) |
|
used |= CEPH_CAP_FILE_BUFFER; |
|
if (ci->i_fx_ref) |
|
used |= CEPH_CAP_FILE_EXCL; |
|
return used; |
|
} |
|
|
|
#define FMODE_WAIT_BIAS 1000 |
|
|
|
/* |
|
* wanted, by virtue of open file modes |
|
*/ |
|
int __ceph_caps_file_wanted(struct ceph_inode_info *ci) |
|
{ |
|
const int PIN_SHIFT = ffs(CEPH_FILE_MODE_PIN); |
|
const int RD_SHIFT = ffs(CEPH_FILE_MODE_RD); |
|
const int WR_SHIFT = ffs(CEPH_FILE_MODE_WR); |
|
const int LAZY_SHIFT = ffs(CEPH_FILE_MODE_LAZY); |
|
struct ceph_mount_options *opt = |
|
ceph_inode_to_client(&ci->vfs_inode)->mount_options; |
|
unsigned long used_cutoff = jiffies - opt->caps_wanted_delay_max * HZ; |
|
unsigned long idle_cutoff = jiffies - opt->caps_wanted_delay_min * HZ; |
|
|
|
if (S_ISDIR(ci->vfs_inode.i_mode)) { |
|
int want = 0; |
|
|
|
/* use used_cutoff here, to keep dir's wanted caps longer */ |
|
if (ci->i_nr_by_mode[RD_SHIFT] > 0 || |
|
time_after(ci->i_last_rd, used_cutoff)) |
|
want |= CEPH_CAP_ANY_SHARED; |
|
|
|
if (ci->i_nr_by_mode[WR_SHIFT] > 0 || |
|
time_after(ci->i_last_wr, used_cutoff)) { |
|
want |= CEPH_CAP_ANY_SHARED | CEPH_CAP_FILE_EXCL; |
|
if (opt->flags & CEPH_MOUNT_OPT_ASYNC_DIROPS) |
|
want |= CEPH_CAP_ANY_DIR_OPS; |
|
} |
|
|
|
if (want || ci->i_nr_by_mode[PIN_SHIFT] > 0) |
|
want |= CEPH_CAP_PIN; |
|
|
|
return want; |
|
} else { |
|
int bits = 0; |
|
|
|
if (ci->i_nr_by_mode[RD_SHIFT] > 0) { |
|
if (ci->i_nr_by_mode[RD_SHIFT] >= FMODE_WAIT_BIAS || |
|
time_after(ci->i_last_rd, used_cutoff)) |
|
bits |= 1 << RD_SHIFT; |
|
} else if (time_after(ci->i_last_rd, idle_cutoff)) { |
|
bits |= 1 << RD_SHIFT; |
|
} |
|
|
|
if (ci->i_nr_by_mode[WR_SHIFT] > 0) { |
|
if (ci->i_nr_by_mode[WR_SHIFT] >= FMODE_WAIT_BIAS || |
|
time_after(ci->i_last_wr, used_cutoff)) |
|
bits |= 1 << WR_SHIFT; |
|
} else if (time_after(ci->i_last_wr, idle_cutoff)) { |
|
bits |= 1 << WR_SHIFT; |
|
} |
|
|
|
/* check lazyio only when read/write is wanted */ |
|
if ((bits & (CEPH_FILE_MODE_RDWR << 1)) && |
|
ci->i_nr_by_mode[LAZY_SHIFT] > 0) |
|
bits |= 1 << LAZY_SHIFT; |
|
|
|
return bits ? ceph_caps_for_mode(bits >> 1) : 0; |
|
} |
|
} |
|
|
|
/* |
|
* wanted, by virtue of open file modes AND cap refs (buffered/cached data) |
|
*/ |
|
int __ceph_caps_wanted(struct ceph_inode_info *ci) |
|
{ |
|
int w = __ceph_caps_file_wanted(ci) | __ceph_caps_used(ci); |
|
if (S_ISDIR(ci->vfs_inode.i_mode)) { |
|
/* we want EXCL if holding caps of dir ops */ |
|
if (w & CEPH_CAP_ANY_DIR_OPS) |
|
w |= CEPH_CAP_FILE_EXCL; |
|
} else { |
|
/* we want EXCL if dirty data */ |
|
if (w & CEPH_CAP_FILE_BUFFER) |
|
w |= CEPH_CAP_FILE_EXCL; |
|
} |
|
return w; |
|
} |
|
|
|
/* |
|
* Return caps we have registered with the MDS(s) as 'wanted'. |
|
*/ |
|
int __ceph_caps_mds_wanted(struct ceph_inode_info *ci, bool check) |
|
{ |
|
struct ceph_cap *cap; |
|
struct rb_node *p; |
|
int mds_wanted = 0; |
|
|
|
for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) { |
|
cap = rb_entry(p, struct ceph_cap, ci_node); |
|
if (check && !__cap_is_valid(cap)) |
|
continue; |
|
if (cap == ci->i_auth_cap) |
|
mds_wanted |= cap->mds_wanted; |
|
else |
|
mds_wanted |= (cap->mds_wanted & ~CEPH_CAP_ANY_FILE_WR); |
|
} |
|
return mds_wanted; |
|
} |
|
|
|
int ceph_is_any_caps(struct inode *inode) |
|
{ |
|
struct ceph_inode_info *ci = ceph_inode(inode); |
|
int ret; |
|
|
|
spin_lock(&ci->i_ceph_lock); |
|
ret = __ceph_is_any_real_caps(ci); |
|
spin_unlock(&ci->i_ceph_lock); |
|
|
|
return ret; |
|
} |
|
|
|
/* |
|
* Remove a cap. Take steps to deal with a racing iterate_session_caps. |
|
* |
|
* caller should hold i_ceph_lock. |
|
* caller will not hold session s_mutex if called from destroy_inode. |
|
*/ |
|
void __ceph_remove_cap(struct ceph_cap *cap, bool queue_release) |
|
{ |
|
struct ceph_mds_session *session = cap->session; |
|
struct ceph_inode_info *ci = cap->ci; |
|
struct ceph_mds_client *mdsc; |
|
int removed = 0; |
|
|
|
/* 'ci' being NULL means the remove have already occurred */ |
|
if (!ci) { |
|
dout("%s: cap inode is NULL\n", __func__); |
|
return; |
|
} |
|
|
|
lockdep_assert_held(&ci->i_ceph_lock); |
|
|
|
dout("__ceph_remove_cap %p from %p\n", cap, &ci->vfs_inode); |
|
|
|
mdsc = ceph_inode_to_client(&ci->vfs_inode)->mdsc; |
|
|
|
/* remove from inode's cap rbtree, and clear auth cap */ |
|
rb_erase(&cap->ci_node, &ci->i_caps); |
|
if (ci->i_auth_cap == cap) |
|
ci->i_auth_cap = NULL; |
|
|
|
/* remove from session list */ |
|
spin_lock(&session->s_cap_lock); |
|
if (session->s_cap_iterator == cap) { |
|
/* not yet, we are iterating over this very cap */ |
|
dout("__ceph_remove_cap delaying %p removal from session %p\n", |
|
cap, cap->session); |
|
} else { |
|
list_del_init(&cap->session_caps); |
|
session->s_nr_caps--; |
|
atomic64_dec(&mdsc->metric.total_caps); |
|
cap->session = NULL; |
|
removed = 1; |
|
} |
|
/* protect backpointer with s_cap_lock: see iterate_session_caps */ |
|
cap->ci = NULL; |
|
|
|
/* |
|
* s_cap_reconnect is protected by s_cap_lock. no one changes |
|
* s_cap_gen while session is in the reconnect state. |
|
*/ |
|
if (queue_release && |
|
(!session->s_cap_reconnect || |
|
cap->cap_gen == atomic_read(&session->s_cap_gen))) { |
|
cap->queue_release = 1; |
|
if (removed) { |
|
__ceph_queue_cap_release(session, cap); |
|
removed = 0; |
|
} |
|
} else { |
|
cap->queue_release = 0; |
|
} |
|
cap->cap_ino = ci->i_vino.ino; |
|
|
|
spin_unlock(&session->s_cap_lock); |
|
|
|
if (removed) |
|
ceph_put_cap(mdsc, cap); |
|
|
|
if (!__ceph_is_any_real_caps(ci)) { |
|
/* when reconnect denied, we remove session caps forcibly, |
|
* i_wr_ref can be non-zero. If there are ongoing write, |
|
* keep i_snap_realm. |
|
*/ |
|
if (ci->i_wr_ref == 0 && ci->i_snap_realm) |
|
ceph_change_snap_realm(&ci->vfs_inode, NULL); |
|
|
|
__cap_delay_cancel(mdsc, ci); |
|
} |
|
} |
|
|
|
void ceph_remove_cap(struct ceph_cap *cap, bool queue_release) |
|
{ |
|
struct ceph_inode_info *ci = cap->ci; |
|
struct ceph_fs_client *fsc; |
|
|
|
/* 'ci' being NULL means the remove have already occurred */ |
|
if (!ci) { |
|
dout("%s: cap inode is NULL\n", __func__); |
|
return; |
|
} |
|
|
|
lockdep_assert_held(&ci->i_ceph_lock); |
|
|
|
fsc = ceph_sb_to_client(ci->vfs_inode.i_sb); |
|
WARN_ON_ONCE(ci->i_auth_cap == cap && |
|
!list_empty(&ci->i_dirty_item) && |
|
!fsc->blocklisted && |
|
READ_ONCE(fsc->mount_state) != CEPH_MOUNT_SHUTDOWN); |
|
|
|
__ceph_remove_cap(cap, queue_release); |
|
} |
|
|
|
struct cap_msg_args { |
|
struct ceph_mds_session *session; |
|
u64 ino, cid, follows; |
|
u64 flush_tid, oldest_flush_tid, size, max_size; |
|
u64 xattr_version; |
|
u64 change_attr; |
|
struct ceph_buffer *xattr_buf; |
|
struct ceph_buffer *old_xattr_buf; |
|
struct timespec64 atime, mtime, ctime, btime; |
|
int op, caps, wanted, dirty; |
|
u32 seq, issue_seq, mseq, time_warp_seq; |
|
u32 flags; |
|
kuid_t uid; |
|
kgid_t gid; |
|
umode_t mode; |
|
bool inline_data; |
|
bool wake; |
|
}; |
|
|
|
/* |
|
* cap struct size + flock buffer size + inline version + inline data size + |
|
* osd_epoch_barrier + oldest_flush_tid |
|
*/ |
|
#define CAP_MSG_SIZE (sizeof(struct ceph_mds_caps) + \ |
|
4 + 8 + 4 + 4 + 8 + 4 + 4 + 4 + 8 + 8 + 4) |
|
|
|
/* Marshal up the cap msg to the MDS */ |
|
static void encode_cap_msg(struct ceph_msg *msg, struct cap_msg_args *arg) |
|
{ |
|
struct ceph_mds_caps *fc; |
|
void *p; |
|
struct ceph_osd_client *osdc = &arg->session->s_mdsc->fsc->client->osdc; |
|
|
|
dout("%s %s %llx %llx caps %s wanted %s dirty %s seq %u/%u tid %llu/%llu mseq %u follows %lld size %llu/%llu xattr_ver %llu xattr_len %d\n", |
|
__func__, ceph_cap_op_name(arg->op), arg->cid, arg->ino, |
|
ceph_cap_string(arg->caps), ceph_cap_string(arg->wanted), |
|
ceph_cap_string(arg->dirty), arg->seq, arg->issue_seq, |
|
arg->flush_tid, arg->oldest_flush_tid, arg->mseq, arg->follows, |
|
arg->size, arg->max_size, arg->xattr_version, |
|
arg->xattr_buf ? (int)arg->xattr_buf->vec.iov_len : 0); |
|
|
|
msg->hdr.version = cpu_to_le16(10); |
|
msg->hdr.tid = cpu_to_le64(arg->flush_tid); |
|
|
|
fc = msg->front.iov_base; |
|
memset(fc, 0, sizeof(*fc)); |
|
|
|
fc->cap_id = cpu_to_le64(arg->cid); |
|
fc->op = cpu_to_le32(arg->op); |
|
fc->seq = cpu_to_le32(arg->seq); |
|
fc->issue_seq = cpu_to_le32(arg->issue_seq); |
|
fc->migrate_seq = cpu_to_le32(arg->mseq); |
|
fc->caps = cpu_to_le32(arg->caps); |
|
fc->wanted = cpu_to_le32(arg->wanted); |
|
fc->dirty = cpu_to_le32(arg->dirty); |
|
fc->ino = cpu_to_le64(arg->ino); |
|
fc->snap_follows = cpu_to_le64(arg->follows); |
|
|
|
fc->size = cpu_to_le64(arg->size); |
|
fc->max_size = cpu_to_le64(arg->max_size); |
|
ceph_encode_timespec64(&fc->mtime, &arg->mtime); |
|
ceph_encode_timespec64(&fc->atime, &arg->atime); |
|
ceph_encode_timespec64(&fc->ctime, &arg->ctime); |
|
fc->time_warp_seq = cpu_to_le32(arg->time_warp_seq); |
|
|
|
fc->uid = cpu_to_le32(from_kuid(&init_user_ns, arg->uid)); |
|
fc->gid = cpu_to_le32(from_kgid(&init_user_ns, arg->gid)); |
|
fc->mode = cpu_to_le32(arg->mode); |
|
|
|
fc->xattr_version = cpu_to_le64(arg->xattr_version); |
|
if (arg->xattr_buf) { |
|
msg->middle = ceph_buffer_get(arg->xattr_buf); |
|
fc->xattr_len = cpu_to_le32(arg->xattr_buf->vec.iov_len); |
|
msg->hdr.middle_len = cpu_to_le32(arg->xattr_buf->vec.iov_len); |
|
} |
|
|
|
p = fc + 1; |
|
/* flock buffer size (version 2) */ |
|
ceph_encode_32(&p, 0); |
|
/* inline version (version 4) */ |
|
ceph_encode_64(&p, arg->inline_data ? 0 : CEPH_INLINE_NONE); |
|
/* inline data size */ |
|
ceph_encode_32(&p, 0); |
|
/* |
|
* osd_epoch_barrier (version 5) |
|
* The epoch_barrier is protected osdc->lock, so READ_ONCE here in |
|
* case it was recently changed |
|
*/ |
|
ceph_encode_32(&p, READ_ONCE(osdc->epoch_barrier)); |
|
/* oldest_flush_tid (version 6) */ |
|
ceph_encode_64(&p, arg->oldest_flush_tid); |
|
|
|
/* |
|
* caller_uid/caller_gid (version 7) |
|
* |
|
* Currently, we don't properly track which caller dirtied the caps |
|
* last, and force a flush of them when there is a conflict. For now, |
|
* just set this to 0:0, to emulate how the MDS has worked up to now. |
|
*/ |
|
ceph_encode_32(&p, 0); |
|
ceph_encode_32(&p, 0); |
|
|
|
/* pool namespace (version 8) (mds always ignores this) */ |
|
ceph_encode_32(&p, 0); |
|
|
|
/* btime and change_attr (version 9) */ |
|
ceph_encode_timespec64(p, &arg->btime); |
|
p += sizeof(struct ceph_timespec); |
|
ceph_encode_64(&p, arg->change_attr); |
|
|
|
/* Advisory flags (version 10) */ |
|
ceph_encode_32(&p, arg->flags); |
|
} |
|
|
|
/* |
|
* Queue cap releases when an inode is dropped from our cache. |
|
*/ |
|
void __ceph_remove_caps(struct ceph_inode_info *ci) |
|
{ |
|
struct rb_node *p; |
|
|
|
/* lock i_ceph_lock, because ceph_d_revalidate(..., LOOKUP_RCU) |
|
* may call __ceph_caps_issued_mask() on a freeing inode. */ |
|
spin_lock(&ci->i_ceph_lock); |
|
p = rb_first(&ci->i_caps); |
|
while (p) { |
|
struct ceph_cap *cap = rb_entry(p, struct ceph_cap, ci_node); |
|
p = rb_next(p); |
|
ceph_remove_cap(cap, true); |
|
} |
|
spin_unlock(&ci->i_ceph_lock); |
|
} |
|
|
|
/* |
|
* Prepare to send a cap message to an MDS. Update the cap state, and populate |
|
* the arg struct with the parameters that will need to be sent. This should |
|
* be done under the i_ceph_lock to guard against changes to cap state. |
|
* |
|
* Make note of max_size reported/requested from mds, revoked caps |
|
* that have now been implemented. |
|
*/ |
|
static void __prep_cap(struct cap_msg_args *arg, struct ceph_cap *cap, |
|
int op, int flags, int used, int want, int retain, |
|
int flushing, u64 flush_tid, u64 oldest_flush_tid) |
|
{ |
|
struct ceph_inode_info *ci = cap->ci; |
|
struct inode *inode = &ci->vfs_inode; |
|
int held, revoking; |
|
|
|
lockdep_assert_held(&ci->i_ceph_lock); |
|
|
|
held = cap->issued | cap->implemented; |
|
revoking = cap->implemented & ~cap->issued; |
|
retain &= ~revoking; |
|
|
|
dout("%s %p cap %p session %p %s -> %s (revoking %s)\n", |
|
__func__, inode, cap, cap->session, |
|
ceph_cap_string(held), ceph_cap_string(held & retain), |
|
ceph_cap_string(revoking)); |
|
BUG_ON((retain & CEPH_CAP_PIN) == 0); |
|
|
|
ci->i_ceph_flags &= ~CEPH_I_FLUSH; |
|
|
|
cap->issued &= retain; /* drop bits we don't want */ |
|
/* |
|
* Wake up any waiters on wanted -> needed transition. This is due to |
|
* the weird transition from buffered to sync IO... we need to flush |
|
* dirty pages _before_ allowing sync writes to avoid reordering. |
|
*/ |
|
arg->wake = cap->implemented & ~cap->issued; |
|
cap->implemented &= cap->issued | used; |
|
cap->mds_wanted = want; |
|
|
|
arg->session = cap->session; |
|
arg->ino = ceph_vino(inode).ino; |
|
arg->cid = cap->cap_id; |
|
arg->follows = flushing ? ci->i_head_snapc->seq : 0; |
|
arg->flush_tid = flush_tid; |
|
arg->oldest_flush_tid = oldest_flush_tid; |
|
|
|
arg->size = i_size_read(inode); |
|
ci->i_reported_size = arg->size; |
|
arg->max_size = ci->i_wanted_max_size; |
|
if (cap == ci->i_auth_cap) { |
|
if (want & CEPH_CAP_ANY_FILE_WR) |
|
ci->i_requested_max_size = arg->max_size; |
|
else |
|
ci->i_requested_max_size = 0; |
|
} |
|
|
|
if (flushing & CEPH_CAP_XATTR_EXCL) { |
|
arg->old_xattr_buf = __ceph_build_xattrs_blob(ci); |
|
arg->xattr_version = ci->i_xattrs.version; |
|
arg->xattr_buf = ci->i_xattrs.blob; |
|
} else { |
|
arg->xattr_buf = NULL; |
|
arg->old_xattr_buf = NULL; |
|
} |
|
|
|
arg->mtime = inode->i_mtime; |
|
arg->atime = inode->i_atime; |
|
arg->ctime = inode->i_ctime; |
|
arg->btime = ci->i_btime; |
|
arg->change_attr = inode_peek_iversion_raw(inode); |
|
|
|
arg->op = op; |
|
arg->caps = cap->implemented; |
|
arg->wanted = want; |
|
arg->dirty = flushing; |
|
|
|
arg->seq = cap->seq; |
|
arg->issue_seq = cap->issue_seq; |
|
arg->mseq = cap->mseq; |
|
arg->time_warp_seq = ci->i_time_warp_seq; |
|
|
|
arg->uid = inode->i_uid; |
|
arg->gid = inode->i_gid; |
|
arg->mode = inode->i_mode; |
|
|
|
arg->inline_data = ci->i_inline_version != CEPH_INLINE_NONE; |
|
if (!(flags & CEPH_CLIENT_CAPS_PENDING_CAPSNAP) && |
|
!list_empty(&ci->i_cap_snaps)) { |
|
struct ceph_cap_snap *capsnap; |
|
list_for_each_entry_reverse(capsnap, &ci->i_cap_snaps, ci_item) { |
|
if (capsnap->cap_flush.tid) |
|
break; |
|
if (capsnap->need_flush) { |
|
flags |= CEPH_CLIENT_CAPS_PENDING_CAPSNAP; |
|
break; |
|
} |
|
} |
|
} |
|
arg->flags = flags; |
|
} |
|
|
|
/* |
|
* Send a cap msg on the given inode. |
|
* |
|
* Caller should hold snap_rwsem (read), s_mutex. |
|
*/ |
|
static void __send_cap(struct cap_msg_args *arg, struct ceph_inode_info *ci) |
|
{ |
|
struct ceph_msg *msg; |
|
struct inode *inode = &ci->vfs_inode; |
|
|
|
msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPS, CAP_MSG_SIZE, GFP_NOFS, false); |
|
if (!msg) { |
|
pr_err("error allocating cap msg: ino (%llx.%llx) flushing %s tid %llu, requeuing cap.\n", |
|
ceph_vinop(inode), ceph_cap_string(arg->dirty), |
|
arg->flush_tid); |
|
spin_lock(&ci->i_ceph_lock); |
|
__cap_delay_requeue(arg->session->s_mdsc, ci); |
|
spin_unlock(&ci->i_ceph_lock); |
|
return; |
|
} |
|
|
|
encode_cap_msg(msg, arg); |
|
ceph_con_send(&arg->session->s_con, msg); |
|
ceph_buffer_put(arg->old_xattr_buf); |
|
if (arg->wake) |
|
wake_up_all(&ci->i_cap_wq); |
|
} |
|
|
|
static inline int __send_flush_snap(struct inode *inode, |
|
struct ceph_mds_session *session, |
|
struct ceph_cap_snap *capsnap, |
|
u32 mseq, u64 oldest_flush_tid) |
|
{ |
|
struct cap_msg_args arg; |
|
struct ceph_msg *msg; |
|
|
|
msg = ceph_msg_new(CEPH_MSG_CLIENT_CAPS, CAP_MSG_SIZE, GFP_NOFS, false); |
|
if (!msg) |
|
return -ENOMEM; |
|
|
|
arg.session = session; |
|
arg.ino = ceph_vino(inode).ino; |
|
arg.cid = 0; |
|
arg.follows = capsnap->follows; |
|
arg.flush_tid = capsnap->cap_flush.tid; |
|
arg.oldest_flush_tid = oldest_flush_tid; |
|
|
|
arg.size = capsnap->size; |
|
arg.max_size = 0; |
|
arg.xattr_version = capsnap->xattr_version; |
|
arg.xattr_buf = capsnap->xattr_blob; |
|
arg.old_xattr_buf = NULL; |
|
|
|
arg.atime = capsnap->atime; |
|
arg.mtime = capsnap->mtime; |
|
arg.ctime = capsnap->ctime; |
|
arg.btime = capsnap->btime; |
|
arg.change_attr = capsnap->change_attr; |
|
|
|
arg.op = CEPH_CAP_OP_FLUSHSNAP; |
|
arg.caps = capsnap->issued; |
|
arg.wanted = 0; |
|
arg.dirty = capsnap->dirty; |
|
|
|
arg.seq = 0; |
|
arg.issue_seq = 0; |
|
arg.mseq = mseq; |
|
arg.time_warp_seq = capsnap->time_warp_seq; |
|
|
|
arg.uid = capsnap->uid; |
|
arg.gid = capsnap->gid; |
|
arg.mode = capsnap->mode; |
|
|
|
arg.inline_data = capsnap->inline_data; |
|
arg.flags = 0; |
|
arg.wake = false; |
|
|
|
encode_cap_msg(msg, &arg); |
|
ceph_con_send(&arg.session->s_con, msg); |
|
return 0; |
|
} |
|
|
|
/* |
|
* When a snapshot is taken, clients accumulate dirty metadata on |
|
* inodes with capabilities in ceph_cap_snaps to describe the file |
|
* state at the time the snapshot was taken. This must be flushed |
|
* asynchronously back to the MDS once sync writes complete and dirty |
|
* data is written out. |
|
* |
|
* Called under i_ceph_lock. |
|
*/ |
|
static void __ceph_flush_snaps(struct ceph_inode_info *ci, |
|
struct ceph_mds_session *session) |
|
__releases(ci->i_ceph_lock) |
|
__acquires(ci->i_ceph_lock) |
|
{ |
|
struct inode *inode = &ci->vfs_inode; |
|
struct ceph_mds_client *mdsc = session->s_mdsc; |
|
struct ceph_cap_snap *capsnap; |
|
u64 oldest_flush_tid = 0; |
|
u64 first_tid = 1, last_tid = 0; |
|
|
|
dout("__flush_snaps %p session %p\n", inode, session); |
|
|
|
list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) { |
|
/* |
|
* we need to wait for sync writes to complete and for dirty |
|
* pages to be written out. |
|
*/ |
|
if (capsnap->dirty_pages || capsnap->writing) |
|
break; |
|
|
|
/* should be removed by ceph_try_drop_cap_snap() */ |
|
BUG_ON(!capsnap->need_flush); |
|
|
|
/* only flush each capsnap once */ |
|
if (capsnap->cap_flush.tid > 0) { |
|
dout(" already flushed %p, skipping\n", capsnap); |
|
continue; |
|
} |
|
|
|
spin_lock(&mdsc->cap_dirty_lock); |
|
capsnap->cap_flush.tid = ++mdsc->last_cap_flush_tid; |
|
list_add_tail(&capsnap->cap_flush.g_list, |
|
&mdsc->cap_flush_list); |
|
if (oldest_flush_tid == 0) |
|
oldest_flush_tid = __get_oldest_flush_tid(mdsc); |
|
if (list_empty(&ci->i_flushing_item)) { |
|
list_add_tail(&ci->i_flushing_item, |
|
&session->s_cap_flushing); |
|
} |
|
spin_unlock(&mdsc->cap_dirty_lock); |
|
|
|
list_add_tail(&capsnap->cap_flush.i_list, |
|
&ci->i_cap_flush_list); |
|
|
|
if (first_tid == 1) |
|
first_tid = capsnap->cap_flush.tid; |
|
last_tid = capsnap->cap_flush.tid; |
|
} |
|
|
|
ci->i_ceph_flags &= ~CEPH_I_FLUSH_SNAPS; |
|
|
|
while (first_tid <= last_tid) { |
|
struct ceph_cap *cap = ci->i_auth_cap; |
|
struct ceph_cap_flush *cf; |
|
int ret; |
|
|
|
if (!(cap && cap->session == session)) { |
|
dout("__flush_snaps %p auth cap %p not mds%d, " |
|
"stop\n", inode, cap, session->s_mds); |
|
break; |
|
} |
|
|
|
ret = -ENOENT; |
|
list_for_each_entry(cf, &ci->i_cap_flush_list, i_list) { |
|
if (cf->tid >= first_tid) { |
|
ret = 0; |
|
break; |
|
} |
|
} |
|
if (ret < 0) |
|
break; |
|
|
|
first_tid = cf->tid + 1; |
|
|
|
capsnap = container_of(cf, struct ceph_cap_snap, cap_flush); |
|
refcount_inc(&capsnap->nref); |
|
spin_unlock(&ci->i_ceph_lock); |
|
|
|
dout("__flush_snaps %p capsnap %p tid %llu %s\n", |
|
inode, capsnap, cf->tid, ceph_cap_string(capsnap->dirty)); |
|
|
|
ret = __send_flush_snap(inode, session, capsnap, cap->mseq, |
|
oldest_flush_tid); |
|
if (ret < 0) { |
|
pr_err("__flush_snaps: error sending cap flushsnap, " |
|
"ino (%llx.%llx) tid %llu follows %llu\n", |
|
ceph_vinop(inode), cf->tid, capsnap->follows); |
|
} |
|
|
|
ceph_put_cap_snap(capsnap); |
|
spin_lock(&ci->i_ceph_lock); |
|
} |
|
} |
|
|
|
void ceph_flush_snaps(struct ceph_inode_info *ci, |
|
struct ceph_mds_session **psession) |
|
{ |
|
struct inode *inode = &ci->vfs_inode; |
|
struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc; |
|
struct ceph_mds_session *session = NULL; |
|
int mds; |
|
|
|
dout("ceph_flush_snaps %p\n", inode); |
|
if (psession) |
|
session = *psession; |
|
retry: |
|
spin_lock(&ci->i_ceph_lock); |
|
if (!(ci->i_ceph_flags & CEPH_I_FLUSH_SNAPS)) { |
|
dout(" no capsnap needs flush, doing nothing\n"); |
|
goto out; |
|
} |
|
if (!ci->i_auth_cap) { |
|
dout(" no auth cap (migrating?), doing nothing\n"); |
|
goto out; |
|
} |
|
|
|
mds = ci->i_auth_cap->session->s_mds; |
|
if (session && session->s_mds != mds) { |
|
dout(" oops, wrong session %p mutex\n", session); |
|
ceph_put_mds_session(session); |
|
session = NULL; |
|
} |
|
if (!session) { |
|
spin_unlock(&ci->i_ceph_lock); |
|
mutex_lock(&mdsc->mutex); |
|
session = __ceph_lookup_mds_session(mdsc, mds); |
|
mutex_unlock(&mdsc->mutex); |
|
goto retry; |
|
} |
|
|
|
// make sure flushsnap messages are sent in proper order. |
|
if (ci->i_ceph_flags & CEPH_I_KICK_FLUSH) |
|
__kick_flushing_caps(mdsc, session, ci, 0); |
|
|
|
__ceph_flush_snaps(ci, session); |
|
out: |
|
spin_unlock(&ci->i_ceph_lock); |
|
|
|
if (psession) |
|
*psession = session; |
|
else |
|
ceph_put_mds_session(session); |
|
/* we flushed them all; remove this inode from the queue */ |
|
spin_lock(&mdsc->snap_flush_lock); |
|
list_del_init(&ci->i_snap_flush_item); |
|
spin_unlock(&mdsc->snap_flush_lock); |
|
} |
|
|
|
/* |
|
* Mark caps dirty. If inode is newly dirty, return the dirty flags. |
|
* Caller is then responsible for calling __mark_inode_dirty with the |
|
* returned flags value. |
|
*/ |
|
int __ceph_mark_dirty_caps(struct ceph_inode_info *ci, int mask, |
|
struct ceph_cap_flush **pcf) |
|
{ |
|
struct ceph_mds_client *mdsc = |
|
ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc; |
|
struct inode *inode = &ci->vfs_inode; |
|
int was = ci->i_dirty_caps; |
|
int dirty = 0; |
|
|
|
lockdep_assert_held(&ci->i_ceph_lock); |
|
|
|
if (!ci->i_auth_cap) { |
|
pr_warn("__mark_dirty_caps %p %llx mask %s, " |
|
"but no auth cap (session was closed?)\n", |
|
inode, ceph_ino(inode), ceph_cap_string(mask)); |
|
return 0; |
|
} |
|
|
|
dout("__mark_dirty_caps %p %s dirty %s -> %s\n", &ci->vfs_inode, |
|
ceph_cap_string(mask), ceph_cap_string(was), |
|
ceph_cap_string(was | mask)); |
|
ci->i_dirty_caps |= mask; |
|
if (was == 0) { |
|
struct ceph_mds_session *session = ci->i_auth_cap->session; |
|
|
|
WARN_ON_ONCE(ci->i_prealloc_cap_flush); |
|
swap(ci->i_prealloc_cap_flush, *pcf); |
|
|
|
if (!ci->i_head_snapc) { |
|
WARN_ON_ONCE(!rwsem_is_locked(&mdsc->snap_rwsem)); |
|
ci->i_head_snapc = ceph_get_snap_context( |
|
ci->i_snap_realm->cached_context); |
|
} |
|
dout(" inode %p now dirty snapc %p auth cap %p\n", |
|
&ci->vfs_inode, ci->i_head_snapc, ci->i_auth_cap); |
|
BUG_ON(!list_empty(&ci->i_dirty_item)); |
|
spin_lock(&mdsc->cap_dirty_lock); |
|
list_add(&ci->i_dirty_item, &session->s_cap_dirty); |
|
spin_unlock(&mdsc->cap_dirty_lock); |
|
if (ci->i_flushing_caps == 0) { |
|
ihold(inode); |
|
dirty |= I_DIRTY_SYNC; |
|
} |
|
} else { |
|
WARN_ON_ONCE(!ci->i_prealloc_cap_flush); |
|
} |
|
BUG_ON(list_empty(&ci->i_dirty_item)); |
|
if (((was | ci->i_flushing_caps) & CEPH_CAP_FILE_BUFFER) && |
|
(mask & CEPH_CAP_FILE_BUFFER)) |
|
dirty |= I_DIRTY_DATASYNC; |
|
__cap_delay_requeue(mdsc, ci); |
|
return dirty; |
|
} |
|
|
|
struct ceph_cap_flush *ceph_alloc_cap_flush(void) |
|
{ |
|
struct ceph_cap_flush *cf; |
|
|
|
cf = kmem_cache_alloc(ceph_cap_flush_cachep, GFP_KERNEL); |
|
if (!cf) |
|
return NULL; |
|
|
|
cf->is_capsnap = false; |
|
return cf; |
|
} |
|
|
|
void ceph_free_cap_flush(struct ceph_cap_flush *cf) |
|
{ |
|
if (cf) |
|
kmem_cache_free(ceph_cap_flush_cachep, cf); |
|
} |
|
|
|
static u64 __get_oldest_flush_tid(struct ceph_mds_client *mdsc) |
|
{ |
|
if (!list_empty(&mdsc->cap_flush_list)) { |
|
struct ceph_cap_flush *cf = |
|
list_first_entry(&mdsc->cap_flush_list, |
|
struct ceph_cap_flush, g_list); |
|
return cf->tid; |
|
} |
|
return 0; |
|
} |
|
|
|
/* |
|
* Remove cap_flush from the mdsc's or inode's flushing cap list. |
|
* Return true if caller needs to wake up flush waiters. |
|
*/ |
|
static bool __detach_cap_flush_from_mdsc(struct ceph_mds_client *mdsc, |
|
struct ceph_cap_flush *cf) |
|
{ |
|
struct ceph_cap_flush *prev; |
|
bool wake = cf->wake; |
|
|
|
if (wake && cf->g_list.prev != &mdsc->cap_flush_list) { |
|
prev = list_prev_entry(cf, g_list); |
|
prev->wake = true; |
|
wake = false; |
|
} |
|
list_del_init(&cf->g_list); |
|
return wake; |
|
} |
|
|
|
static bool __detach_cap_flush_from_ci(struct ceph_inode_info *ci, |
|
struct ceph_cap_flush *cf) |
|
{ |
|
struct ceph_cap_flush *prev; |
|
bool wake = cf->wake; |
|
|
|
if (wake && cf->i_list.prev != &ci->i_cap_flush_list) { |
|
prev = list_prev_entry(cf, i_list); |
|
prev->wake = true; |
|
wake = false; |
|
} |
|
list_del_init(&cf->i_list); |
|
return wake; |
|
} |
|
|
|
/* |
|
* Add dirty inode to the flushing list. Assigned a seq number so we |
|
* can wait for caps to flush without starving. |
|
* |
|
* Called under i_ceph_lock. Returns the flush tid. |
|
*/ |
|
static u64 __mark_caps_flushing(struct inode *inode, |
|
struct ceph_mds_session *session, bool wake, |
|
u64 *oldest_flush_tid) |
|
{ |
|
struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc; |
|
struct ceph_inode_info *ci = ceph_inode(inode); |
|
struct ceph_cap_flush *cf = NULL; |
|
int flushing; |
|
|
|
lockdep_assert_held(&ci->i_ceph_lock); |
|
BUG_ON(ci->i_dirty_caps == 0); |
|
BUG_ON(list_empty(&ci->i_dirty_item)); |
|
BUG_ON(!ci->i_prealloc_cap_flush); |
|
|
|
flushing = ci->i_dirty_caps; |
|
dout("__mark_caps_flushing flushing %s, flushing_caps %s -> %s\n", |
|
ceph_cap_string(flushing), |
|
ceph_cap_string(ci->i_flushing_caps), |
|
ceph_cap_string(ci->i_flushing_caps | flushing)); |
|
ci->i_flushing_caps |= flushing; |
|
ci->i_dirty_caps = 0; |
|
dout(" inode %p now !dirty\n", inode); |
|
|
|
swap(cf, ci->i_prealloc_cap_flush); |
|
cf->caps = flushing; |
|
cf->wake = wake; |
|
|
|
spin_lock(&mdsc->cap_dirty_lock); |
|
list_del_init(&ci->i_dirty_item); |
|
|
|
cf->tid = ++mdsc->last_cap_flush_tid; |
|
list_add_tail(&cf->g_list, &mdsc->cap_flush_list); |
|
*oldest_flush_tid = __get_oldest_flush_tid(mdsc); |
|
|
|
if (list_empty(&ci->i_flushing_item)) { |
|
list_add_tail(&ci->i_flushing_item, &session->s_cap_flushing); |
|
mdsc->num_cap_flushing++; |
|
} |
|
spin_unlock(&mdsc->cap_dirty_lock); |
|
|
|
list_add_tail(&cf->i_list, &ci->i_cap_flush_list); |
|
|
|
return cf->tid; |
|
} |
|
|
|
/* |
|
* try to invalidate mapping pages without blocking. |
|
*/ |
|
static int try_nonblocking_invalidate(struct inode *inode) |
|
__releases(ci->i_ceph_lock) |
|
__acquires(ci->i_ceph_lock) |
|
{ |
|
struct ceph_inode_info *ci = ceph_inode(inode); |
|
u32 invalidating_gen = ci->i_rdcache_gen; |
|
|
|
spin_unlock(&ci->i_ceph_lock); |
|
ceph_fscache_invalidate(inode); |
|
invalidate_mapping_pages(&inode->i_data, 0, -1); |
|
spin_lock(&ci->i_ceph_lock); |
|
|
|
if (inode->i_data.nrpages == 0 && |
|
invalidating_gen == ci->i_rdcache_gen) { |
|
/* success. */ |
|
dout("try_nonblocking_invalidate %p success\n", inode); |
|
/* save any racing async invalidate some trouble */ |
|
ci->i_rdcache_revoking = ci->i_rdcache_gen - 1; |
|
return 0; |
|
} |
|
dout("try_nonblocking_invalidate %p failed\n", inode); |
|
return -1; |
|
} |
|
|
|
bool __ceph_should_report_size(struct ceph_inode_info *ci) |
|
{ |
|
loff_t size = i_size_read(&ci->vfs_inode); |
|
/* mds will adjust max size according to the reported size */ |
|
if (ci->i_flushing_caps & CEPH_CAP_FILE_WR) |
|
return false; |
|
if (size >= ci->i_max_size) |
|
return true; |
|
/* half of previous max_size increment has been used */ |
|
if (ci->i_max_size > ci->i_reported_size && |
|
(size << 1) >= ci->i_max_size + ci->i_reported_size) |
|
return true; |
|
return false; |
|
} |
|
|
|
/* |
|
* Swiss army knife function to examine currently used and wanted |
|
* versus held caps. Release, flush, ack revoked caps to mds as |
|
* appropriate. |
|
* |
|
* CHECK_CAPS_AUTHONLY - we should only check the auth cap |
|
* CHECK_CAPS_FLUSH - we should flush any dirty caps immediately, without |
|
* further delay. |
|
*/ |
|
void ceph_check_caps(struct ceph_inode_info *ci, int flags, |
|
struct ceph_mds_session *session) |
|
{ |
|
struct inode *inode = &ci->vfs_inode; |
|
struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb); |
|
struct ceph_cap *cap; |
|
u64 flush_tid, oldest_flush_tid; |
|
int file_wanted, used, cap_used; |
|
int issued, implemented, want, retain, revoking, flushing = 0; |
|
int mds = -1; /* keep track of how far we've gone through i_caps list |
|
to avoid an infinite loop on retry */ |
|
struct rb_node *p; |
|
bool queue_invalidate = false; |
|
bool tried_invalidate = false; |
|
|
|
if (session) |
|
ceph_get_mds_session(session); |
|
|
|
spin_lock(&ci->i_ceph_lock); |
|
if (ci->i_ceph_flags & CEPH_I_FLUSH) |
|
flags |= CHECK_CAPS_FLUSH; |
|
retry: |
|
/* Caps wanted by virtue of active open files. */ |
|
file_wanted = __ceph_caps_file_wanted(ci); |
|
|
|
/* Caps which have active references against them */ |
|
used = __ceph_caps_used(ci); |
|
|
|
/* |
|
* "issued" represents the current caps that the MDS wants us to have. |
|
* "implemented" is the set that we have been granted, and includes the |
|
* ones that have not yet been returned to the MDS (the "revoking" set, |
|
* usually because they have outstanding references). |
|
*/ |
|
issued = __ceph_caps_issued(ci, &implemented); |
|
revoking = implemented & ~issued; |
|
|
|
want = file_wanted; |
|
|
|
/* The ones we currently want to retain (may be adjusted below) */ |
|
retain = file_wanted | used | CEPH_CAP_PIN; |
|
if (!mdsc->stopping && inode->i_nlink > 0) { |
|
if (file_wanted) { |
|
retain |= CEPH_CAP_ANY; /* be greedy */ |
|
} else if (S_ISDIR(inode->i_mode) && |
|
(issued & CEPH_CAP_FILE_SHARED) && |
|
__ceph_dir_is_complete(ci)) { |
|
/* |
|
* If a directory is complete, we want to keep |
|
* the exclusive cap. So that MDS does not end up |
|
* revoking the shared cap on every create/unlink |
|
* operation. |
|
*/ |
|
if (IS_RDONLY(inode)) { |
|
want = CEPH_CAP_ANY_SHARED; |
|
} else { |
|
want |= CEPH_CAP_ANY_SHARED | CEPH_CAP_FILE_EXCL; |
|
} |
|
retain |= want; |
|
} else { |
|
|
|
retain |= CEPH_CAP_ANY_SHARED; |
|
/* |
|
* keep RD only if we didn't have the file open RW, |
|
* because then the mds would revoke it anyway to |
|
* journal max_size=0. |
|
*/ |
|
if (ci->i_max_size == 0) |
|
retain |= CEPH_CAP_ANY_RD; |
|
} |
|
} |
|
|
|
dout("check_caps %p file_want %s used %s dirty %s flushing %s" |
|
" issued %s revoking %s retain %s %s%s\n", inode, |
|
ceph_cap_string(file_wanted), |
|
ceph_cap_string(used), ceph_cap_string(ci->i_dirty_caps), |
|
ceph_cap_string(ci->i_flushing_caps), |
|
ceph_cap_string(issued), ceph_cap_string(revoking), |
|
ceph_cap_string(retain), |
|
(flags & CHECK_CAPS_AUTHONLY) ? " AUTHONLY" : "", |
|
(flags & CHECK_CAPS_FLUSH) ? " FLUSH" : ""); |
|
|
|
/* |
|
* If we no longer need to hold onto old our caps, and we may |
|
* have cached pages, but don't want them, then try to invalidate. |
|
* If we fail, it's because pages are locked.... try again later. |
|
*/ |
|
if ((!(flags & CHECK_CAPS_NOINVAL) || mdsc->stopping) && |
|
S_ISREG(inode->i_mode) && |
|
!(ci->i_wb_ref || ci->i_wrbuffer_ref) && /* no dirty pages... */ |
|
inode->i_data.nrpages && /* have cached pages */ |
|
(revoking & (CEPH_CAP_FILE_CACHE| |
|
CEPH_CAP_FILE_LAZYIO)) && /* or revoking cache */ |
|
!tried_invalidate) { |
|
dout("check_caps trying to invalidate on %p\n", inode); |
|
if (try_nonblocking_invalidate(inode) < 0) { |
|
dout("check_caps queuing invalidate\n"); |
|
queue_invalidate = true; |
|
ci->i_rdcache_revoking = ci->i_rdcache_gen; |
|
} |
|
tried_invalidate = true; |
|
goto retry; |
|
} |
|
|
|
for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) { |
|
int mflags = 0; |
|
struct cap_msg_args arg; |
|
|
|
cap = rb_entry(p, struct ceph_cap, ci_node); |
|
|
|
/* avoid looping forever */ |
|
if (mds >= cap->mds || |
|
((flags & CHECK_CAPS_AUTHONLY) && cap != ci->i_auth_cap)) |
|
continue; |
|
|
|
/* |
|
* If we have an auth cap, we don't need to consider any |
|
* overlapping caps as used. |
|
*/ |
|
cap_used = used; |
|
if (ci->i_auth_cap && cap != ci->i_auth_cap) |
|
cap_used &= ~ci->i_auth_cap->issued; |
|
|
|
revoking = cap->implemented & ~cap->issued; |
|
dout(" mds%d cap %p used %s issued %s implemented %s revoking %s\n", |
|
cap->mds, cap, ceph_cap_string(cap_used), |
|
ceph_cap_string(cap->issued), |
|
ceph_cap_string(cap->implemented), |
|
ceph_cap_string(revoking)); |
|
|
|
if (cap == ci->i_auth_cap && |
|
(cap->issued & CEPH_CAP_FILE_WR)) { |
|
/* request larger max_size from MDS? */ |
|
if (ci->i_wanted_max_size > ci->i_max_size && |
|
ci->i_wanted_max_size > ci->i_requested_max_size) { |
|
dout("requesting new max_size\n"); |
|
goto ack; |
|
} |
|
|
|
/* approaching file_max? */ |
|
if (__ceph_should_report_size(ci)) { |
|
dout("i_size approaching max_size\n"); |
|
goto ack; |
|
} |
|
} |
|
/* flush anything dirty? */ |
|
if (cap == ci->i_auth_cap) { |
|
if ((flags & CHECK_CAPS_FLUSH) && ci->i_dirty_caps) { |
|
dout("flushing dirty caps\n"); |
|
goto ack; |
|
} |
|
if (ci->i_ceph_flags & CEPH_I_FLUSH_SNAPS) { |
|
dout("flushing snap caps\n"); |
|
goto ack; |
|
} |
|
} |
|
|
|
/* completed revocation? going down and there are no caps? */ |
|
if (revoking && (revoking & cap_used) == 0) { |
|
dout("completed revocation of %s\n", |
|
ceph_cap_string(cap->implemented & ~cap->issued)); |
|
goto ack; |
|
} |
|
|
|
/* want more caps from mds? */ |
|
if (want & ~cap->mds_wanted) { |
|
if (want & ~(cap->mds_wanted | cap->issued)) |
|
goto ack; |
|
if (!__cap_is_valid(cap)) |
|
goto ack; |
|
} |
|
|
|
/* things we might delay */ |
|
if ((cap->issued & ~retain) == 0) |
|
continue; /* nope, all good */ |
|
|
|
ack: |
|
ceph_put_mds_session(session); |
|
session = ceph_get_mds_session(cap->session); |
|
|
|
/* kick flushing and flush snaps before sending normal |
|
* cap message */ |
|
if (cap == ci->i_auth_cap && |
|
(ci->i_ceph_flags & |
|
(CEPH_I_KICK_FLUSH | CEPH_I_FLUSH_SNAPS))) { |
|
if (ci->i_ceph_flags & CEPH_I_KICK_FLUSH) |
|
__kick_flushing_caps(mdsc, session, ci, 0); |
|
if (ci->i_ceph_flags & CEPH_I_FLUSH_SNAPS) |
|
__ceph_flush_snaps(ci, session); |
|
|
|
goto retry; |
|
} |
|
|
|
if (cap == ci->i_auth_cap && ci->i_dirty_caps) { |
|
flushing = ci->i_dirty_caps; |
|
flush_tid = __mark_caps_flushing(inode, session, false, |
|
&oldest_flush_tid); |
|
if (flags & CHECK_CAPS_FLUSH && |
|
list_empty(&session->s_cap_dirty)) |
|
mflags |= CEPH_CLIENT_CAPS_SYNC; |
|
} else { |
|
flushing = 0; |
|
flush_tid = 0; |
|
spin_lock(&mdsc->cap_dirty_lock); |
|
oldest_flush_tid = __get_oldest_flush_tid(mdsc); |
|
spin_unlock(&mdsc->cap_dirty_lock); |
|
} |
|
|
|
mds = cap->mds; /* remember mds, so we don't repeat */ |
|
|
|
__prep_cap(&arg, cap, CEPH_CAP_OP_UPDATE, mflags, cap_used, |
|
want, retain, flushing, flush_tid, oldest_flush_tid); |
|
|
|
spin_unlock(&ci->i_ceph_lock); |
|
__send_cap(&arg, ci); |
|
spin_lock(&ci->i_ceph_lock); |
|
|
|
goto retry; /* retake i_ceph_lock and restart our cap scan. */ |
|
} |
|
|
|
/* periodically re-calculate caps wanted by open files */ |
|
if (__ceph_is_any_real_caps(ci) && |
|
list_empty(&ci->i_cap_delay_list) && |
|
(file_wanted & ~CEPH_CAP_PIN) && |
|
!(used & (CEPH_CAP_FILE_RD | CEPH_CAP_ANY_FILE_WR))) { |
|
__cap_delay_requeue(mdsc, ci); |
|
} |
|
|
|
spin_unlock(&ci->i_ceph_lock); |
|
|
|
ceph_put_mds_session(session); |
|
if (queue_invalidate) |
|
ceph_queue_invalidate(inode); |
|
} |
|
|
|
/* |
|
* Try to flush dirty caps back to the auth mds. |
|
*/ |
|
static int try_flush_caps(struct inode *inode, u64 *ptid) |
|
{ |
|
struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc; |
|
struct ceph_inode_info *ci = ceph_inode(inode); |
|
int flushing = 0; |
|
u64 flush_tid = 0, oldest_flush_tid = 0; |
|
|
|
spin_lock(&ci->i_ceph_lock); |
|
retry_locked: |
|
if (ci->i_dirty_caps && ci->i_auth_cap) { |
|
struct ceph_cap *cap = ci->i_auth_cap; |
|
struct cap_msg_args arg; |
|
struct ceph_mds_session *session = cap->session; |
|
|
|
if (session->s_state < CEPH_MDS_SESSION_OPEN) { |
|
spin_unlock(&ci->i_ceph_lock); |
|
goto out; |
|
} |
|
|
|
if (ci->i_ceph_flags & |
|
(CEPH_I_KICK_FLUSH | CEPH_I_FLUSH_SNAPS)) { |
|
if (ci->i_ceph_flags & CEPH_I_KICK_FLUSH) |
|
__kick_flushing_caps(mdsc, session, ci, 0); |
|
if (ci->i_ceph_flags & CEPH_I_FLUSH_SNAPS) |
|
__ceph_flush_snaps(ci, session); |
|
goto retry_locked; |
|
} |
|
|
|
flushing = ci->i_dirty_caps; |
|
flush_tid = __mark_caps_flushing(inode, session, true, |
|
&oldest_flush_tid); |
|
|
|
__prep_cap(&arg, cap, CEPH_CAP_OP_FLUSH, CEPH_CLIENT_CAPS_SYNC, |
|
__ceph_caps_used(ci), __ceph_caps_wanted(ci), |
|
(cap->issued | cap->implemented), |
|
flushing, flush_tid, oldest_flush_tid); |
|
spin_unlock(&ci->i_ceph_lock); |
|
|
|
__send_cap(&arg, ci); |
|
} else { |
|
if (!list_empty(&ci->i_cap_flush_list)) { |
|
struct ceph_cap_flush *cf = |
|
list_last_entry(&ci->i_cap_flush_list, |
|
struct ceph_cap_flush, i_list); |
|
cf->wake = true; |
|
flush_tid = cf->tid; |
|
} |
|
flushing = ci->i_flushing_caps; |
|
spin_unlock(&ci->i_ceph_lock); |
|
} |
|
out: |
|
*ptid = flush_tid; |
|
return flushing; |
|
} |
|
|
|
/* |
|
* Return true if we've flushed caps through the given flush_tid. |
|
*/ |
|
static int caps_are_flushed(struct inode *inode, u64 flush_tid) |
|
{ |
|
struct ceph_inode_info *ci = ceph_inode(inode); |
|
int ret = 1; |
|
|
|
spin_lock(&ci->i_ceph_lock); |
|
if (!list_empty(&ci->i_cap_flush_list)) { |
|
struct ceph_cap_flush * cf = |
|
list_first_entry(&ci->i_cap_flush_list, |
|
struct ceph_cap_flush, i_list); |
|
if (cf->tid <= flush_tid) |
|
ret = 0; |
|
} |
|
spin_unlock(&ci->i_ceph_lock); |
|
return ret; |
|
} |
|
|
|
/* |
|
* wait for any unsafe requests to complete. |
|
*/ |
|
static int unsafe_request_wait(struct inode *inode) |
|
{ |
|
struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc; |
|
struct ceph_inode_info *ci = ceph_inode(inode); |
|
struct ceph_mds_request *req1 = NULL, *req2 = NULL; |
|
int ret, err = 0; |
|
|
|
spin_lock(&ci->i_unsafe_lock); |
|
if (S_ISDIR(inode->i_mode) && !list_empty(&ci->i_unsafe_dirops)) { |
|
req1 = list_last_entry(&ci->i_unsafe_dirops, |
|
struct ceph_mds_request, |
|
r_unsafe_dir_item); |
|
ceph_mdsc_get_request(req1); |
|
} |
|
if (!list_empty(&ci->i_unsafe_iops)) { |
|
req2 = list_last_entry(&ci->i_unsafe_iops, |
|
struct ceph_mds_request, |
|
r_unsafe_target_item); |
|
ceph_mdsc_get_request(req2); |
|
} |
|
spin_unlock(&ci->i_unsafe_lock); |
|
|
|
/* |
|
* Trigger to flush the journal logs in all the relevant MDSes |
|
* manually, or in the worst case we must wait at most 5 seconds |
|
* to wait the journal logs to be flushed by the MDSes periodically. |
|
*/ |
|
if (req1 || req2) { |
|
struct ceph_mds_session **sessions = NULL; |
|
struct ceph_mds_session *s; |
|
struct ceph_mds_request *req; |
|
unsigned int max; |
|
int i; |
|
|
|
/* |
|
* The mdsc->max_sessions is unlikely to be changed |
|
* mostly, here we will retry it by reallocating the |
|
* sessions arrary memory to get rid of the mdsc->mutex |
|
* lock. |
|
*/ |
|
retry: |
|
max = mdsc->max_sessions; |
|
sessions = krealloc(sessions, max * sizeof(s), __GFP_ZERO); |
|
if (!sessions) |
|
return -ENOMEM; |
|
|
|
spin_lock(&ci->i_unsafe_lock); |
|
if (req1) { |
|
list_for_each_entry(req, &ci->i_unsafe_dirops, |
|
r_unsafe_dir_item) { |
|
s = req->r_session; |
|
if (unlikely(s->s_mds >= max)) { |
|
spin_unlock(&ci->i_unsafe_lock); |
|
goto retry; |
|
} |
|
if (!sessions[s->s_mds]) { |
|
s = ceph_get_mds_session(s); |
|
sessions[s->s_mds] = s; |
|
} |
|
} |
|
} |
|
if (req2) { |
|
list_for_each_entry(req, &ci->i_unsafe_iops, |
|
r_unsafe_target_item) { |
|
s = req->r_session; |
|
if (unlikely(s->s_mds >= max)) { |
|
spin_unlock(&ci->i_unsafe_lock); |
|
goto retry; |
|
} |
|
if (!sessions[s->s_mds]) { |
|
s = ceph_get_mds_session(s); |
|
sessions[s->s_mds] = s; |
|
} |
|
} |
|
} |
|
spin_unlock(&ci->i_unsafe_lock); |
|
|
|
/* the auth MDS */ |
|
spin_lock(&ci->i_ceph_lock); |
|
if (ci->i_auth_cap) { |
|
s = ci->i_auth_cap->session; |
|
if (!sessions[s->s_mds]) |
|
sessions[s->s_mds] = ceph_get_mds_session(s); |
|
} |
|
spin_unlock(&ci->i_ceph_lock); |
|
|
|
/* send flush mdlog request to MDSes */ |
|
for (i = 0; i < max; i++) { |
|
s = sessions[i]; |
|
if (s) { |
|
send_flush_mdlog(s); |
|
ceph_put_mds_session(s); |
|
} |
|
} |
|
kfree(sessions); |
|
} |
|
|
|
dout("unsafe_request_wait %p wait on tid %llu %llu\n", |
|
inode, req1 ? req1->r_tid : 0ULL, req2 ? req2->r_tid : 0ULL); |
|
if (req1) { |
|
ret = !wait_for_completion_timeout(&req1->r_safe_completion, |
|
ceph_timeout_jiffies(req1->r_timeout)); |
|
if (ret) |
|
err = -EIO; |
|
ceph_mdsc_put_request(req1); |
|
} |
|
if (req2) { |
|
ret = !wait_for_completion_timeout(&req2->r_safe_completion, |
|
ceph_timeout_jiffies(req2->r_timeout)); |
|
if (ret) |
|
err = -EIO; |
|
ceph_mdsc_put_request(req2); |
|
} |
|
return err; |
|
} |
|
|
|
int ceph_fsync(struct file *file, loff_t start, loff_t end, int datasync) |
|
{ |
|
struct ceph_file_info *fi = file->private_data; |
|
struct inode *inode = file->f_mapping->host; |
|
struct ceph_inode_info *ci = ceph_inode(inode); |
|
u64 flush_tid; |
|
int ret, err; |
|
int dirty; |
|
|
|
dout("fsync %p%s\n", inode, datasync ? " datasync" : ""); |
|
|
|
ret = file_write_and_wait_range(file, start, end); |
|
if (datasync) |
|
goto out; |
|
|
|
ret = ceph_wait_on_async_create(inode); |
|
if (ret) |
|
goto out; |
|
|
|
dirty = try_flush_caps(inode, &flush_tid); |
|
dout("fsync dirty caps are %s\n", ceph_cap_string(dirty)); |
|
|
|
err = unsafe_request_wait(inode); |
|
|
|
/* |
|
* only wait on non-file metadata writeback (the mds |
|
* can recover size and mtime, so we don't need to |
|
* wait for that) |
|
*/ |
|
if (!err && (dirty & ~CEPH_CAP_ANY_FILE_WR)) { |
|
err = wait_event_interruptible(ci->i_cap_wq, |
|
caps_are_flushed(inode, flush_tid)); |
|
} |
|
|
|
if (err < 0) |
|
ret = err; |
|
|
|
if (errseq_check(&ci->i_meta_err, READ_ONCE(fi->meta_err))) { |
|
spin_lock(&file->f_lock); |
|
err = errseq_check_and_advance(&ci->i_meta_err, |
|
&fi->meta_err); |
|
spin_unlock(&file->f_lock); |
|
if (err < 0) |
|
ret = err; |
|
} |
|
out: |
|
dout("fsync %p%s result=%d\n", inode, datasync ? " datasync" : "", ret); |
|
return ret; |
|
} |
|
|
|
/* |
|
* Flush any dirty caps back to the mds. If we aren't asked to wait, |
|
* queue inode for flush but don't do so immediately, because we can |
|
* get by with fewer MDS messages if we wait for data writeback to |
|
* complete first. |
|
*/ |
|
int ceph_write_inode(struct inode *inode, struct writeback_control *wbc) |
|
{ |
|
struct ceph_inode_info *ci = ceph_inode(inode); |
|
u64 flush_tid; |
|
int err = 0; |
|
int dirty; |
|
int wait = (wbc->sync_mode == WB_SYNC_ALL && !wbc->for_sync); |
|
|
|
dout("write_inode %p wait=%d\n", inode, wait); |
|
if (wait) { |
|
dirty = try_flush_caps(inode, &flush_tid); |
|
if (dirty) |
|
err = wait_event_interruptible(ci->i_cap_wq, |
|
caps_are_flushed(inode, flush_tid)); |
|
} else { |
|
struct ceph_mds_client *mdsc = |
|
ceph_sb_to_client(inode->i_sb)->mdsc; |
|
|
|
spin_lock(&ci->i_ceph_lock); |
|
if (__ceph_caps_dirty(ci)) |
|
__cap_delay_requeue_front(mdsc, ci); |
|
spin_unlock(&ci->i_ceph_lock); |
|
} |
|
return err; |
|
} |
|
|
|
static void __kick_flushing_caps(struct ceph_mds_client *mdsc, |
|
struct ceph_mds_session *session, |
|
struct ceph_inode_info *ci, |
|
u64 oldest_flush_tid) |
|
__releases(ci->i_ceph_lock) |
|
__acquires(ci->i_ceph_lock) |
|
{ |
|
struct inode *inode = &ci->vfs_inode; |
|
struct ceph_cap *cap; |
|
struct ceph_cap_flush *cf; |
|
int ret; |
|
u64 first_tid = 0; |
|
u64 last_snap_flush = 0; |
|
|
|
ci->i_ceph_flags &= ~CEPH_I_KICK_FLUSH; |
|
|
|
list_for_each_entry_reverse(cf, &ci->i_cap_flush_list, i_list) { |
|
if (cf->is_capsnap) { |
|
last_snap_flush = cf->tid; |
|
break; |
|
} |
|
} |
|
|
|
list_for_each_entry(cf, &ci->i_cap_flush_list, i_list) { |
|
if (cf->tid < first_tid) |
|
continue; |
|
|
|
cap = ci->i_auth_cap; |
|
if (!(cap && cap->session == session)) { |
|
pr_err("%p auth cap %p not mds%d ???\n", |
|
inode, cap, session->s_mds); |
|
break; |
|
} |
|
|
|
first_tid = cf->tid + 1; |
|
|
|
if (!cf->is_capsnap) { |
|
struct cap_msg_args arg; |
|
|
|
dout("kick_flushing_caps %p cap %p tid %llu %s\n", |
|
inode, cap, cf->tid, ceph_cap_string(cf->caps)); |
|
__prep_cap(&arg, cap, CEPH_CAP_OP_FLUSH, |
|
(cf->tid < last_snap_flush ? |
|
CEPH_CLIENT_CAPS_PENDING_CAPSNAP : 0), |
|
__ceph_caps_used(ci), |
|
__ceph_caps_wanted(ci), |
|
(cap->issued | cap->implemented), |
|
cf->caps, cf->tid, oldest_flush_tid); |
|
spin_unlock(&ci->i_ceph_lock); |
|
__send_cap(&arg, ci); |
|
} else { |
|
struct ceph_cap_snap *capsnap = |
|
container_of(cf, struct ceph_cap_snap, |
|
cap_flush); |
|
dout("kick_flushing_caps %p capsnap %p tid %llu %s\n", |
|
inode, capsnap, cf->tid, |
|
ceph_cap_string(capsnap->dirty)); |
|
|
|
refcount_inc(&capsnap->nref); |
|
spin_unlock(&ci->i_ceph_lock); |
|
|
|
ret = __send_flush_snap(inode, session, capsnap, cap->mseq, |
|
oldest_flush_tid); |
|
if (ret < 0) { |
|
pr_err("kick_flushing_caps: error sending " |
|
"cap flushsnap, ino (%llx.%llx) " |
|
"tid %llu follows %llu\n", |
|
ceph_vinop(inode), cf->tid, |
|
capsnap->follows); |
|
} |
|
|
|
ceph_put_cap_snap(capsnap); |
|
} |
|
|
|
spin_lock(&ci->i_ceph_lock); |
|
} |
|
} |
|
|
|
void ceph_early_kick_flushing_caps(struct ceph_mds_client *mdsc, |
|
struct ceph_mds_session *session) |
|
{ |
|
struct ceph_inode_info *ci; |
|
struct ceph_cap *cap; |
|
u64 oldest_flush_tid; |
|
|
|
dout("early_kick_flushing_caps mds%d\n", session->s_mds); |
|
|
|
spin_lock(&mdsc->cap_dirty_lock); |
|
oldest_flush_tid = __get_oldest_flush_tid(mdsc); |
|
spin_unlock(&mdsc->cap_dirty_lock); |
|
|
|
list_for_each_entry(ci, &session->s_cap_flushing, i_flushing_item) { |
|
spin_lock(&ci->i_ceph_lock); |
|
cap = ci->i_auth_cap; |
|
if (!(cap && cap->session == session)) { |
|
pr_err("%p auth cap %p not mds%d ???\n", |
|
&ci->vfs_inode, cap, session->s_mds); |
|
spin_unlock(&ci->i_ceph_lock); |
|
continue; |
|
} |
|
|
|
|
|
/* |
|
* if flushing caps were revoked, we re-send the cap flush |
|
* in client reconnect stage. This guarantees MDS * processes |
|
* the cap flush message before issuing the flushing caps to |
|
* other client. |
|
*/ |
|
if ((cap->issued & ci->i_flushing_caps) != |
|
ci->i_flushing_caps) { |
|
/* encode_caps_cb() also will reset these sequence |
|
* numbers. make sure sequence numbers in cap flush |
|
* message match later reconnect message */ |
|
cap->seq = 0; |
|
cap->issue_seq = 0; |
|
cap->mseq = 0; |
|
__kick_flushing_caps(mdsc, session, ci, |
|
oldest_flush_tid); |
|
} else { |
|
ci->i_ceph_flags |= CEPH_I_KICK_FLUSH; |
|
} |
|
|
|
spin_unlock(&ci->i_ceph_lock); |
|
} |
|
} |
|
|
|
void ceph_kick_flushing_caps(struct ceph_mds_client *mdsc, |
|
struct ceph_mds_session *session) |
|
{ |
|
struct ceph_inode_info *ci; |
|
struct ceph_cap *cap; |
|
u64 oldest_flush_tid; |
|
|
|
lockdep_assert_held(&session->s_mutex); |
|
|
|
dout("kick_flushing_caps mds%d\n", session->s_mds); |
|
|
|
spin_lock(&mdsc->cap_dirty_lock); |
|
oldest_flush_tid = __get_oldest_flush_tid(mdsc); |
|
spin_unlock(&mdsc->cap_dirty_lock); |
|
|
|
list_for_each_entry(ci, &session->s_cap_flushing, i_flushing_item) { |
|
spin_lock(&ci->i_ceph_lock); |
|
cap = ci->i_auth_cap; |
|
if (!(cap && cap->session == session)) { |
|
pr_err("%p auth cap %p not mds%d ???\n", |
|
&ci->vfs_inode, cap, session->s_mds); |
|
spin_unlock(&ci->i_ceph_lock); |
|
continue; |
|
} |
|
if (ci->i_ceph_flags & CEPH_I_KICK_FLUSH) { |
|
__kick_flushing_caps(mdsc, session, ci, |
|
oldest_flush_tid); |
|
} |
|
spin_unlock(&ci->i_ceph_lock); |
|
} |
|
} |
|
|
|
void ceph_kick_flushing_inode_caps(struct ceph_mds_session *session, |
|
struct ceph_inode_info *ci) |
|
{ |
|
struct ceph_mds_client *mdsc = session->s_mdsc; |
|
struct ceph_cap *cap = ci->i_auth_cap; |
|
|
|
lockdep_assert_held(&ci->i_ceph_lock); |
|
|
|
dout("%s %p flushing %s\n", __func__, &ci->vfs_inode, |
|
ceph_cap_string(ci->i_flushing_caps)); |
|
|
|
if (!list_empty(&ci->i_cap_flush_list)) { |
|
u64 oldest_flush_tid; |
|
spin_lock(&mdsc->cap_dirty_lock); |
|
list_move_tail(&ci->i_flushing_item, |
|
&cap->session->s_cap_flushing); |
|
oldest_flush_tid = __get_oldest_flush_tid(mdsc); |
|
spin_unlock(&mdsc->cap_dirty_lock); |
|
|
|
__kick_flushing_caps(mdsc, session, ci, oldest_flush_tid); |
|
} |
|
} |
|
|
|
|
|
/* |
|
* Take references to capabilities we hold, so that we don't release |
|
* them to the MDS prematurely. |
|
*/ |
|
void ceph_take_cap_refs(struct ceph_inode_info *ci, int got, |
|
bool snap_rwsem_locked) |
|
{ |
|
lockdep_assert_held(&ci->i_ceph_lock); |
|
|
|
if (got & CEPH_CAP_PIN) |
|
ci->i_pin_ref++; |
|
if (got & CEPH_CAP_FILE_RD) |
|
ci->i_rd_ref++; |
|
if (got & CEPH_CAP_FILE_CACHE) |
|
ci->i_rdcache_ref++; |
|
if (got & CEPH_CAP_FILE_EXCL) |
|
ci->i_fx_ref++; |
|
if (got & CEPH_CAP_FILE_WR) { |
|
if (ci->i_wr_ref == 0 && !ci->i_head_snapc) { |
|
BUG_ON(!snap_rwsem_locked); |
|
ci->i_head_snapc = ceph_get_snap_context( |
|
ci->i_snap_realm->cached_context); |
|
} |
|
ci->i_wr_ref++; |
|
} |
|
if (got & CEPH_CAP_FILE_BUFFER) { |
|
if (ci->i_wb_ref == 0) |
|
ihold(&ci->vfs_inode); |
|
ci->i_wb_ref++; |
|
dout("%s %p wb %d -> %d (?)\n", __func__, |
|
&ci->vfs_inode, ci->i_wb_ref-1, ci->i_wb_ref); |
|
} |
|
} |
|
|
|
/* |
|
* Try to grab cap references. Specify those refs we @want, and the |
|
* minimal set we @need. Also include the larger offset we are writing |
|
* to (when applicable), and check against max_size here as well. |
|
* Note that caller is responsible for ensuring max_size increases are |
|
* requested from the MDS. |
|
* |
|
* Returns 0 if caps were not able to be acquired (yet), 1 if succeed, |
|
* or a negative error code. There are 3 speical error codes: |
|
* -EAGAIN: need to sleep but non-blocking is specified |
|
* -EFBIG: ask caller to call check_max_size() and try again. |
|
* -ESTALE: ask caller to call ceph_renew_caps() and try again. |
|
*/ |
|
enum { |
|
/* first 8 bits are reserved for CEPH_FILE_MODE_FOO */ |
|
NON_BLOCKING = (1 << 8), |
|
CHECK_FILELOCK = (1 << 9), |
|
}; |
|
|
|
static int try_get_cap_refs(struct inode *inode, int need, int want, |
|
loff_t endoff, int flags, int *got) |
|
{ |
|
struct ceph_inode_info *ci = ceph_inode(inode); |
|
struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc; |
|
int ret = 0; |
|
int have, implemented; |
|
bool snap_rwsem_locked = false; |
|
|
|
dout("get_cap_refs %p need %s want %s\n", inode, |
|
ceph_cap_string(need), ceph_cap_string(want)); |
|
|
|
again: |
|
spin_lock(&ci->i_ceph_lock); |
|
|
|
if ((flags & CHECK_FILELOCK) && |
|
(ci->i_ceph_flags & CEPH_I_ERROR_FILELOCK)) { |
|
dout("try_get_cap_refs %p error filelock\n", inode); |
|
ret = -EIO; |
|
goto out_unlock; |
|
} |
|
|
|
/* finish pending truncate */ |
|
while (ci->i_truncate_pending) { |
|
spin_unlock(&ci->i_ceph_lock); |
|
if (snap_rwsem_locked) { |
|
up_read(&mdsc->snap_rwsem); |
|
snap_rwsem_locked = false; |
|
} |
|
__ceph_do_pending_vmtruncate(inode); |
|
spin_lock(&ci->i_ceph_lock); |
|
} |
|
|
|
have = __ceph_caps_issued(ci, &implemented); |
|
|
|
if (have & need & CEPH_CAP_FILE_WR) { |
|
if (endoff >= 0 && endoff > (loff_t)ci->i_max_size) { |
|
dout("get_cap_refs %p endoff %llu > maxsize %llu\n", |
|
inode, endoff, ci->i_max_size); |
|
if (endoff > ci->i_requested_max_size) |
|
ret = ci->i_auth_cap ? -EFBIG : -ESTALE; |
|
goto out_unlock; |
|
} |
|
/* |
|
* If a sync write is in progress, we must wait, so that we |
|
* can get a final snapshot value for size+mtime. |
|
*/ |
|
if (__ceph_have_pending_cap_snap(ci)) { |
|
dout("get_cap_refs %p cap_snap_pending\n", inode); |
|
goto out_unlock; |
|
} |
|
} |
|
|
|
if ((have & need) == need) { |
|
/* |
|
* Look at (implemented & ~have & not) so that we keep waiting |
|
* on transition from wanted -> needed caps. This is needed |
|
* for WRBUFFER|WR -> WR to avoid a new WR sync write from |
|
* going before a prior buffered writeback happens. |
|
*/ |
|
int not = want & ~(have & need); |
|
int revoking = implemented & ~have; |
|
dout("get_cap_refs %p have %s but not %s (revoking %s)\n", |
|
inode, ceph_cap_string(have), ceph_cap_string(not), |
|
ceph_cap_string(revoking)); |
|
if ((revoking & not) == 0) { |
|
if (!snap_rwsem_locked && |
|
!ci->i_head_snapc && |
|
(need & CEPH_CAP_FILE_WR)) { |
|
if (!down_read_trylock(&mdsc->snap_rwsem)) { |
|
/* |
|
* we can not call down_read() when |
|
* task isn't in TASK_RUNNING state |
|
*/ |
|
if (flags & NON_BLOCKING) { |
|
ret = -EAGAIN; |
|
goto out_unlock; |
|
} |
|
|
|
spin_unlock(&ci->i_ceph_lock); |
|
down_read(&mdsc->snap_rwsem); |
|
snap_rwsem_locked = true; |
|
goto again; |
|
} |
|
snap_rwsem_locked = true; |
|
} |
|
if ((have & want) == want) |
|
*got = need | want; |
|
else |
|
*got = need; |
|
ceph_take_cap_refs(ci, *got, true); |
|
ret = 1; |
|
} |
|
} else { |
|
int session_readonly = false; |
|
int mds_wanted; |
|
if (ci->i_auth_cap && |
|
(need & (CEPH_CAP_FILE_WR | CEPH_CAP_FILE_EXCL))) { |
|
struct ceph_mds_session *s = ci->i_auth_cap->session; |
|
spin_lock(&s->s_cap_lock); |
|
session_readonly = s->s_readonly; |
|
spin_unlock(&s->s_cap_lock); |
|
} |
|
if (session_readonly) { |
|
dout("get_cap_refs %p need %s but mds%d readonly\n", |
|
inode, ceph_cap_string(need), ci->i_auth_cap->mds); |
|
ret = -EROFS; |
|
goto out_unlock; |
|
} |
|
|
|
if (READ_ONCE(mdsc->fsc->mount_state) >= CEPH_MOUNT_SHUTDOWN) { |
|
dout("get_cap_refs %p forced umount\n", inode); |
|
ret = -EIO; |
|
goto out_unlock; |
|
} |
|
mds_wanted = __ceph_caps_mds_wanted(ci, false); |
|
if (need & ~mds_wanted) { |
|
dout("get_cap_refs %p need %s > mds_wanted %s\n", |
|
inode, ceph_cap_string(need), |
|
ceph_cap_string(mds_wanted)); |
|
ret = -ESTALE; |
|
goto out_unlock; |
|
} |
|
|
|
dout("get_cap_refs %p have %s need %s\n", inode, |
|
ceph_cap_string(have), ceph_cap_string(need)); |
|
} |
|
out_unlock: |
|
|
|
__ceph_touch_fmode(ci, mdsc, flags); |
|
|
|
spin_unlock(&ci->i_ceph_lock); |
|
if (snap_rwsem_locked) |
|
up_read(&mdsc->snap_rwsem); |
|
|
|
if (!ret) |
|
ceph_update_cap_mis(&mdsc->metric); |
|
else if (ret == 1) |
|
ceph_update_cap_hit(&mdsc->metric); |
|
|
|
dout("get_cap_refs %p ret %d got %s\n", inode, |
|
ret, ceph_cap_string(*got)); |
|
return ret; |
|
} |
|
|
|
/* |
|
* Check the offset we are writing up to against our current |
|
* max_size. If necessary, tell the MDS we want to write to |
|
* a larger offset. |
|
*/ |
|
static void check_max_size(struct inode *inode, loff_t endoff) |
|
{ |
|
struct ceph_inode_info *ci = ceph_inode(inode); |
|
int check = 0; |
|
|
|
/* do we need to explicitly request a larger max_size? */ |
|
spin_lock(&ci->i_ceph_lock); |
|
if (endoff >= ci->i_max_size && endoff > ci->i_wanted_max_size) { |
|
dout("write %p at large endoff %llu, req max_size\n", |
|
inode, endoff); |
|
ci->i_wanted_max_size = endoff; |
|
} |
|
/* duplicate ceph_check_caps()'s logic */ |
|
if (ci->i_auth_cap && |
|
(ci->i_auth_cap->issued & CEPH_CAP_FILE_WR) && |
|
ci->i_wanted_max_size > ci->i_max_size && |
|
ci->i_wanted_max_size > ci->i_requested_max_size) |
|
check = 1; |
|
spin_unlock(&ci->i_ceph_lock); |
|
if (check) |
|
ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL); |
|
} |
|
|
|
static inline int get_used_fmode(int caps) |
|
{ |
|
int fmode = 0; |
|
if (caps & CEPH_CAP_FILE_RD) |
|
fmode |= CEPH_FILE_MODE_RD; |
|
if (caps & CEPH_CAP_FILE_WR) |
|
fmode |= CEPH_FILE_MODE_WR; |
|
return fmode; |
|
} |
|
|
|
int ceph_try_get_caps(struct inode *inode, int need, int want, |
|
bool nonblock, int *got) |
|
{ |
|
int ret, flags; |
|
|
|
BUG_ON(need & ~CEPH_CAP_FILE_RD); |
|
BUG_ON(want & ~(CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO | |
|
CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_EXCL | |
|
CEPH_CAP_ANY_DIR_OPS)); |
|
if (need) { |
|
ret = ceph_pool_perm_check(inode, need); |
|
if (ret < 0) |
|
return ret; |
|
} |
|
|
|
flags = get_used_fmode(need | want); |
|
if (nonblock) |
|
flags |= NON_BLOCKING; |
|
|
|
ret = try_get_cap_refs(inode, need, want, 0, flags, got); |
|
/* three special error codes */ |
|
if (ret == -EAGAIN || ret == -EFBIG || ret == -ESTALE) |
|
ret = 0; |
|
return ret; |
|
} |
|
|
|
/* |
|
* Wait for caps, and take cap references. If we can't get a WR cap |
|
* due to a small max_size, make sure we check_max_size (and possibly |
|
* ask the mds) so we don't get hung up indefinitely. |
|
*/ |
|
int ceph_get_caps(struct file *filp, int need, int want, loff_t endoff, int *got) |
|
{ |
|
struct ceph_file_info *fi = filp->private_data; |
|
struct inode *inode = file_inode(filp); |
|
struct ceph_inode_info *ci = ceph_inode(inode); |
|
struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
|
int ret, _got, flags; |
|
|
|
ret = ceph_pool_perm_check(inode, need); |
|
if (ret < 0) |
|
return ret; |
|
|
|
if ((fi->fmode & CEPH_FILE_MODE_WR) && |
|
fi->filp_gen != READ_ONCE(fsc->filp_gen)) |
|
return -EBADF; |
|
|
|
flags = get_used_fmode(need | want); |
|
|
|
while (true) { |
|
flags &= CEPH_FILE_MODE_MASK; |
|
if (atomic_read(&fi->num_locks)) |
|
flags |= CHECK_FILELOCK; |
|
_got = 0; |
|
ret = try_get_cap_refs(inode, need, want, endoff, |
|
flags, &_got); |
|
WARN_ON_ONCE(ret == -EAGAIN); |
|
if (!ret) { |
|
struct ceph_mds_client *mdsc = fsc->mdsc; |
|
struct cap_wait cw; |
|
DEFINE_WAIT_FUNC(wait, woken_wake_function); |
|
|
|
cw.ino = ceph_ino(inode); |
|
cw.tgid = current->tgid; |
|
cw.need = need; |
|
cw.want = want; |
|
|
|
spin_lock(&mdsc->caps_list_lock); |
|
list_add(&cw.list, &mdsc->cap_wait_list); |
|
spin_unlock(&mdsc->caps_list_lock); |
|
|
|
/* make sure used fmode not timeout */ |
|
ceph_get_fmode(ci, flags, FMODE_WAIT_BIAS); |
|
add_wait_queue(&ci->i_cap_wq, &wait); |
|
|
|
flags |= NON_BLOCKING; |
|
while (!(ret = try_get_cap_refs(inode, need, want, |
|
endoff, flags, &_got))) { |
|
if (signal_pending(current)) { |
|
ret = -ERESTARTSYS; |
|
break; |
|
} |
|
wait_woken(&wait, TASK_INTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT); |
|
} |
|
|
|
remove_wait_queue(&ci->i_cap_wq, &wait); |
|
ceph_put_fmode(ci, flags, FMODE_WAIT_BIAS); |
|
|
|
spin_lock(&mdsc->caps_list_lock); |
|
list_del(&cw.list); |
|
spin_unlock(&mdsc->caps_list_lock); |
|
|
|
if (ret == -EAGAIN) |
|
continue; |
|
} |
|
|
|
if ((fi->fmode & CEPH_FILE_MODE_WR) && |
|
fi->filp_gen != READ_ONCE(fsc->filp_gen)) { |
|
if (ret >= 0 && _got) |
|
ceph_put_cap_refs(ci, _got); |
|
return -EBADF; |
|
} |
|
|
|
if (ret < 0) { |
|
if (ret == -EFBIG || ret == -ESTALE) { |
|
int ret2 = ceph_wait_on_async_create(inode); |
|
if (ret2 < 0) |
|
return ret2; |
|
} |
|
if (ret == -EFBIG) { |
|
check_max_size(inode, endoff); |
|
continue; |
|
} |
|
if (ret == -ESTALE) { |
|
/* session was killed, try renew caps */ |
|
ret = ceph_renew_caps(inode, flags); |
|
if (ret == 0) |
|
continue; |
|
} |
|
return ret; |
|
} |
|
|
|
if (S_ISREG(ci->vfs_inode.i_mode) && |
|
ci->i_inline_version != CEPH_INLINE_NONE && |
|
(_got & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO)) && |
|
i_size_read(inode) > 0) { |
|
struct page *page = |
|
find_get_page(inode->i_mapping, 0); |
|
if (page) { |
|
bool uptodate = PageUptodate(page); |
|
|
|
put_page(page); |
|
if (uptodate) |
|
break; |
|
} |
|
/* |
|
* drop cap refs first because getattr while |
|
* holding * caps refs can cause deadlock. |
|
*/ |
|
ceph_put_cap_refs(ci, _got); |
|
_got = 0; |
|
|
|
/* |
|
* getattr request will bring inline data into |
|
* page cache |
|
*/ |
|
ret = __ceph_do_getattr(inode, NULL, |
|
CEPH_STAT_CAP_INLINE_DATA, |
|
true); |
|
if (ret < 0) |
|
return ret; |
|
continue; |
|
} |
|
break; |
|
} |
|
*got = _got; |
|
return 0; |
|
} |
|
|
|
/* |
|
* Take cap refs. Caller must already know we hold at least one ref |
|
* on the caps in question or we don't know this is safe. |
|
*/ |
|
void ceph_get_cap_refs(struct ceph_inode_info *ci, int caps) |
|
{ |
|
spin_lock(&ci->i_ceph_lock); |
|
ceph_take_cap_refs(ci, caps, false); |
|
spin_unlock(&ci->i_ceph_lock); |
|
} |
|
|
|
|
|
/* |
|
* drop cap_snap that is not associated with any snapshot. |
|
* we don't need to send FLUSHSNAP message for it. |
|
*/ |
|
static int ceph_try_drop_cap_snap(struct ceph_inode_info *ci, |
|
struct ceph_cap_snap *capsnap) |
|
{ |
|
if (!capsnap->need_flush && |
|
!capsnap->writing && !capsnap->dirty_pages) { |
|
dout("dropping cap_snap %p follows %llu\n", |
|
capsnap, capsnap->follows); |
|
BUG_ON(capsnap->cap_flush.tid > 0); |
|
ceph_put_snap_context(capsnap->context); |
|
if (!list_is_last(&capsnap->ci_item, &ci->i_cap_snaps)) |
|
ci->i_ceph_flags |= CEPH_I_FLUSH_SNAPS; |
|
|
|
list_del(&capsnap->ci_item); |
|
ceph_put_cap_snap(capsnap); |
|
return 1; |
|
} |
|
return 0; |
|
} |
|
|
|
enum put_cap_refs_mode { |
|
PUT_CAP_REFS_SYNC = 0, |
|
PUT_CAP_REFS_NO_CHECK, |
|
PUT_CAP_REFS_ASYNC, |
|
}; |
|
|
|
/* |
|
* Release cap refs. |
|
* |
|
* If we released the last ref on any given cap, call ceph_check_caps |
|
* to release (or schedule a release). |
|
* |
|
* If we are releasing a WR cap (from a sync write), finalize any affected |
|
* cap_snap, and wake up any waiters. |
|
*/ |
|
static void __ceph_put_cap_refs(struct ceph_inode_info *ci, int had, |
|
enum put_cap_refs_mode mode) |
|
{ |
|
struct inode *inode = &ci->vfs_inode; |
|
int last = 0, put = 0, flushsnaps = 0, wake = 0; |
|
bool check_flushsnaps = false; |
|
|
|
spin_lock(&ci->i_ceph_lock); |
|
if (had & CEPH_CAP_PIN) |
|
--ci->i_pin_ref; |
|
if (had & CEPH_CAP_FILE_RD) |
|
if (--ci->i_rd_ref == 0) |
|
last++; |
|
if (had & CEPH_CAP_FILE_CACHE) |
|
if (--ci->i_rdcache_ref == 0) |
|
last++; |
|
if (had & CEPH_CAP_FILE_EXCL) |
|
if (--ci->i_fx_ref == 0) |
|
last++; |
|
if (had & CEPH_CAP_FILE_BUFFER) { |
|
if (--ci->i_wb_ref == 0) { |
|
last++; |
|
/* put the ref held by ceph_take_cap_refs() */ |
|
put++; |
|
check_flushsnaps = true; |
|
} |
|
dout("put_cap_refs %p wb %d -> %d (?)\n", |
|
inode, ci->i_wb_ref+1, ci->i_wb_ref); |
|
} |
|
if (had & CEPH_CAP_FILE_WR) { |
|
if (--ci->i_wr_ref == 0) { |
|
last++; |
|
check_flushsnaps = true; |
|
if (ci->i_wrbuffer_ref_head == 0 && |
|
ci->i_dirty_caps == 0 && |
|
ci->i_flushing_caps == 0) { |
|
BUG_ON(!ci->i_head_snapc); |
|
ceph_put_snap_context(ci->i_head_snapc); |
|
ci->i_head_snapc = NULL; |
|
} |
|
/* see comment in __ceph_remove_cap() */ |
|
if (!__ceph_is_any_real_caps(ci) && ci->i_snap_realm) |
|
ceph_change_snap_realm(inode, NULL); |
|
} |
|
} |
|
if (check_flushsnaps && __ceph_have_pending_cap_snap(ci)) { |
|
struct ceph_cap_snap *capsnap = |
|
list_last_entry(&ci->i_cap_snaps, |
|
struct ceph_cap_snap, |
|
ci_item); |
|
|
|
capsnap->writing = 0; |
|
if (ceph_try_drop_cap_snap(ci, capsnap)) |
|
/* put the ref held by ceph_queue_cap_snap() */ |
|
put++; |
|
else if (__ceph_finish_cap_snap(ci, capsnap)) |
|
flushsnaps = 1; |
|
wake = 1; |
|
} |
|
spin_unlock(&ci->i_ceph_lock); |
|
|
|
dout("put_cap_refs %p had %s%s%s\n", inode, ceph_cap_string(had), |
|
last ? " last" : "", put ? " put" : ""); |
|
|
|
switch (mode) { |
|
case PUT_CAP_REFS_SYNC: |
|
if (last) |
|
ceph_check_caps(ci, 0, NULL); |
|
else if (flushsnaps) |
|
ceph_flush_snaps(ci, NULL); |
|
break; |
|
case PUT_CAP_REFS_ASYNC: |
|
if (last) |
|
ceph_queue_check_caps(inode); |
|
else if (flushsnaps) |
|
ceph_queue_flush_snaps(inode); |
|
break; |
|
default: |
|
break; |
|
} |
|
if (wake) |
|
wake_up_all(&ci->i_cap_wq); |
|
while (put-- > 0) |
|
iput(inode); |
|
} |
|
|
|
void ceph_put_cap_refs(struct ceph_inode_info *ci, int had) |
|
{ |
|
__ceph_put_cap_refs(ci, had, PUT_CAP_REFS_SYNC); |
|
} |
|
|
|
void ceph_put_cap_refs_async(struct ceph_inode_info *ci, int had) |
|
{ |
|
__ceph_put_cap_refs(ci, had, PUT_CAP_REFS_ASYNC); |
|
} |
|
|
|
void ceph_put_cap_refs_no_check_caps(struct ceph_inode_info *ci, int had) |
|
{ |
|
__ceph_put_cap_refs(ci, had, PUT_CAP_REFS_NO_CHECK); |
|
} |
|
|
|
/* |
|
* Release @nr WRBUFFER refs on dirty pages for the given @snapc snap |
|
* context. Adjust per-snap dirty page accounting as appropriate. |
|
* Once all dirty data for a cap_snap is flushed, flush snapped file |
|
* metadata back to the MDS. If we dropped the last ref, call |
|
* ceph_check_caps. |
|
*/ |
|
void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr, |
|
struct ceph_snap_context *snapc) |
|
{ |
|
struct inode *inode = &ci->vfs_inode; |
|
struct ceph_cap_snap *capsnap = NULL; |
|
int put = 0; |
|
bool last = false; |
|
bool found = false; |
|
bool flush_snaps = false; |
|
bool complete_capsnap = false; |
|
|
|
spin_lock(&ci->i_ceph_lock); |
|
ci->i_wrbuffer_ref -= nr; |
|
if (ci->i_wrbuffer_ref == 0) { |
|
last = true; |
|
put++; |
|
} |
|
|
|
if (ci->i_head_snapc == snapc) { |
|
ci->i_wrbuffer_ref_head -= nr; |
|
if (ci->i_wrbuffer_ref_head == 0 && |
|
ci->i_wr_ref == 0 && |
|
ci->i_dirty_caps == 0 && |
|
ci->i_flushing_caps == 0) { |
|
BUG_ON(!ci->i_head_snapc); |
|
ceph_put_snap_context(ci->i_head_snapc); |
|
ci->i_head_snapc = NULL; |
|
} |
|
dout("put_wrbuffer_cap_refs on %p head %d/%d -> %d/%d %s\n", |
|
inode, |
|
ci->i_wrbuffer_ref+nr, ci->i_wrbuffer_ref_head+nr, |
|
ci->i_wrbuffer_ref, ci->i_wrbuffer_ref_head, |
|
last ? " LAST" : ""); |
|
} else { |
|
list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) { |
|
if (capsnap->context == snapc) { |
|
found = true; |
|
break; |
|
} |
|
} |
|
|
|
if (!found) { |
|
/* |
|
* The capsnap should already be removed when removing |
|
* auth cap in the case of a forced unmount. |
|
*/ |
|
WARN_ON_ONCE(ci->i_auth_cap); |
|
goto unlock; |
|
} |
|
|
|
capsnap->dirty_pages -= nr; |
|
if (capsnap->dirty_pages == 0) { |
|
complete_capsnap = true; |
|
if (!capsnap->writing) { |
|
if (ceph_try_drop_cap_snap(ci, capsnap)) { |
|
put++; |
|
} else { |
|
ci->i_ceph_flags |= CEPH_I_FLUSH_SNAPS; |
|
flush_snaps = true; |
|
} |
|
} |
|
} |
|
dout("put_wrbuffer_cap_refs on %p cap_snap %p " |
|
" snap %lld %d/%d -> %d/%d %s%s\n", |
|
inode, capsnap, capsnap->context->seq, |
|
ci->i_wrbuffer_ref+nr, capsnap->dirty_pages + nr, |
|
ci->i_wrbuffer_ref, capsnap->dirty_pages, |
|
last ? " (wrbuffer last)" : "", |
|
complete_capsnap ? " (complete capsnap)" : ""); |
|
} |
|
|
|
unlock: |
|
spin_unlock(&ci->i_ceph_lock); |
|
|
|
if (last) { |
|
ceph_check_caps(ci, 0, NULL); |
|
} else if (flush_snaps) { |
|
ceph_flush_snaps(ci, NULL); |
|
} |
|
if (complete_capsnap) |
|
wake_up_all(&ci->i_cap_wq); |
|
while (put-- > 0) { |
|
iput(inode); |
|
} |
|
} |
|
|
|
/* |
|
* Invalidate unlinked inode's aliases, so we can drop the inode ASAP. |
|
*/ |
|
static void invalidate_aliases(struct inode *inode) |
|
{ |
|
struct dentry *dn, *prev = NULL; |
|
|
|
dout("invalidate_aliases inode %p\n", inode); |
|
d_prune_aliases(inode); |
|
/* |
|
* For non-directory inode, d_find_alias() only returns |
|
* hashed dentry. After calling d_invalidate(), the |
|
* dentry becomes unhashed. |
|
* |
|
* For directory inode, d_find_alias() can return |
|
* unhashed dentry. But directory inode should have |
|
* one alias at most. |
|
*/ |
|
while ((dn = d_find_alias(inode))) { |
|
if (dn == prev) { |
|
dput(dn); |
|
break; |
|
} |
|
d_invalidate(dn); |
|
if (prev) |
|
dput(prev); |
|
prev = dn; |
|
} |
|
if (prev) |
|
dput(prev); |
|
} |
|
|
|
struct cap_extra_info { |
|
struct ceph_string *pool_ns; |
|
/* inline data */ |
|
u64 inline_version; |
|
void *inline_data; |
|
u32 inline_len; |
|
/* dirstat */ |
|
bool dirstat_valid; |
|
u64 nfiles; |
|
u64 nsubdirs; |
|
u64 change_attr; |
|
/* currently issued */ |
|
int issued; |
|
struct timespec64 btime; |
|
}; |
|
|
|
/* |
|
* Handle a cap GRANT message from the MDS. (Note that a GRANT may |
|
* actually be a revocation if it specifies a smaller cap set.) |
|
* |
|
* caller holds s_mutex and i_ceph_lock, we drop both. |
|
*/ |
|
static void handle_cap_grant(struct inode *inode, |
|
struct ceph_mds_session *session, |
|
struct ceph_cap *cap, |
|
struct ceph_mds_caps *grant, |
|
struct ceph_buffer *xattr_buf, |
|
struct cap_extra_info *extra_info) |
|
__releases(ci->i_ceph_lock) |
|
__releases(session->s_mdsc->snap_rwsem) |
|
{ |
|
struct ceph_inode_info *ci = ceph_inode(inode); |
|
int seq = le32_to_cpu(grant->seq); |
|
int newcaps = le32_to_cpu(grant->caps); |
|
int used, wanted, dirty; |
|
u64 size = le64_to_cpu(grant->size); |
|
u64 max_size = le64_to_cpu(grant->max_size); |
|
unsigned char check_caps = 0; |
|
bool was_stale = cap->cap_gen < atomic_read(&session->s_cap_gen); |
|
bool wake = false; |
|
bool writeback = false; |
|
bool queue_trunc = false; |
|
bool queue_invalidate = false; |
|
bool deleted_inode = false; |
|
bool fill_inline = false; |
|
|
|
dout("handle_cap_grant inode %p cap %p mds%d seq %d %s\n", |
|
inode, cap, session->s_mds, seq, ceph_cap_string(newcaps)); |
|
dout(" size %llu max_size %llu, i_size %llu\n", size, max_size, |
|
i_size_read(inode)); |
|
|
|
|
|
/* |
|
* If CACHE is being revoked, and we have no dirty buffers, |
|
* try to invalidate (once). (If there are dirty buffers, we |
|
* will invalidate _after_ writeback.) |
|
*/ |
|
if (S_ISREG(inode->i_mode) && /* don't invalidate readdir cache */ |
|
((cap->issued & ~newcaps) & CEPH_CAP_FILE_CACHE) && |
|
(newcaps & CEPH_CAP_FILE_LAZYIO) == 0 && |
|
!(ci->i_wrbuffer_ref || ci->i_wb_ref)) { |
|
if (try_nonblocking_invalidate(inode)) { |
|
/* there were locked pages.. invalidate later |
|
in a separate thread. */ |
|
if (ci->i_rdcache_revoking != ci->i_rdcache_gen) { |
|
queue_invalidate = true; |
|
ci->i_rdcache_revoking = ci->i_rdcache_gen; |
|
} |
|
} |
|
} |
|
|
|
if (was_stale) |
|
cap->issued = cap->implemented = CEPH_CAP_PIN; |
|
|
|
/* |
|
* auth mds of the inode changed. we received the cap export message, |
|
* but still haven't received the cap import message. handle_cap_export |
|
* updated the new auth MDS' cap. |
|
* |
|
* "ceph_seq_cmp(seq, cap->seq) <= 0" means we are processing a message |
|
* that was sent before the cap import message. So don't remove caps. |
|
*/ |
|
if (ceph_seq_cmp(seq, cap->seq) <= 0) { |
|
WARN_ON(cap != ci->i_auth_cap); |
|
WARN_ON(cap->cap_id != le64_to_cpu(grant->cap_id)); |
|
seq = cap->seq; |
|
newcaps |= cap->issued; |
|
} |
|
|
|
/* side effects now are allowed */ |
|
cap->cap_gen = atomic_read(&session->s_cap_gen); |
|
cap->seq = seq; |
|
|
|
__check_cap_issue(ci, cap, newcaps); |
|
|
|
inode_set_max_iversion_raw(inode, extra_info->change_attr); |
|
|
|
if ((newcaps & CEPH_CAP_AUTH_SHARED) && |
|
(extra_info->issued & CEPH_CAP_AUTH_EXCL) == 0) { |
|
umode_t mode = le32_to_cpu(grant->mode); |
|
|
|
if (inode_wrong_type(inode, mode)) |
|
pr_warn_once("inode type changed! (ino %llx.%llx is 0%o, mds says 0%o)\n", |
|
ceph_vinop(inode), inode->i_mode, mode); |
|
else |
|
inode->i_mode = mode; |
|
inode->i_uid = make_kuid(&init_user_ns, le32_to_cpu(grant->uid)); |
|
inode->i_gid = make_kgid(&init_user_ns, le32_to_cpu(grant->gid)); |
|
ci->i_btime = extra_info->btime; |
|
dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode, |
|
from_kuid(&init_user_ns, inode->i_uid), |
|
from_kgid(&init_user_ns, inode->i_gid)); |
|
} |
|
|
|
if ((newcaps & CEPH_CAP_LINK_SHARED) && |
|
(extra_info->issued & CEPH_CAP_LINK_EXCL) == 0) { |
|
set_nlink(inode, le32_to_cpu(grant->nlink)); |
|
if (inode->i_nlink == 0 && |
|
(newcaps & (CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL))) |
|
deleted_inode = true; |
|
} |
|
|
|
if ((extra_info->issued & CEPH_CAP_XATTR_EXCL) == 0 && |
|
grant->xattr_len) { |
|
int len = le32_to_cpu(grant->xattr_len); |
|
u64 version = le64_to_cpu(grant->xattr_version); |
|
|
|
if (version > ci->i_xattrs.version) { |
|
dout(" got new xattrs v%llu on %p len %d\n", |
|
version, inode, len); |
|
if (ci->i_xattrs.blob) |
|
ceph_buffer_put(ci->i_xattrs.blob); |
|
ci->i_xattrs.blob = ceph_buffer_get(xattr_buf); |
|
ci->i_xattrs.version = version; |
|
ceph_forget_all_cached_acls(inode); |
|
ceph_security_invalidate_secctx(inode); |
|
} |
|
} |
|
|
|
if (newcaps & CEPH_CAP_ANY_RD) { |
|
struct timespec64 mtime, atime, ctime; |
|
/* ctime/mtime/atime? */ |
|
ceph_decode_timespec64(&mtime, &grant->mtime); |
|
ceph_decode_timespec64(&atime, &grant->atime); |
|
ceph_decode_timespec64(&ctime, &grant->ctime); |
|
ceph_fill_file_time(inode, extra_info->issued, |
|
le32_to_cpu(grant->time_warp_seq), |
|
&ctime, &mtime, &atime); |
|
} |
|
|
|
if ((newcaps & CEPH_CAP_FILE_SHARED) && extra_info->dirstat_valid) { |
|
ci->i_files = extra_info->nfiles; |
|
ci->i_subdirs = extra_info->nsubdirs; |
|
} |
|
|
|
if (newcaps & (CEPH_CAP_ANY_FILE_RD | CEPH_CAP_ANY_FILE_WR)) { |
|
/* file layout may have changed */ |
|
s64 old_pool = ci->i_layout.pool_id; |
|
struct ceph_string *old_ns; |
|
|
|
ceph_file_layout_from_legacy(&ci->i_layout, &grant->layout); |
|
old_ns = rcu_dereference_protected(ci->i_layout.pool_ns, |
|
lockdep_is_held(&ci->i_ceph_lock)); |
|
rcu_assign_pointer(ci->i_layout.pool_ns, extra_info->pool_ns); |
|
|
|
if (ci->i_layout.pool_id != old_pool || |
|
extra_info->pool_ns != old_ns) |
|
ci->i_ceph_flags &= ~CEPH_I_POOL_PERM; |
|
|
|
extra_info->pool_ns = old_ns; |
|
|
|
/* size/truncate_seq? */ |
|
queue_trunc = ceph_fill_file_size(inode, extra_info->issued, |
|
le32_to_cpu(grant->truncate_seq), |
|
le64_to_cpu(grant->truncate_size), |
|
size); |
|
} |
|
|
|
if (ci->i_auth_cap == cap && (newcaps & CEPH_CAP_ANY_FILE_WR)) { |
|
if (max_size != ci->i_max_size) { |
|
dout("max_size %lld -> %llu\n", |
|
ci->i_max_size, max_size); |
|
ci->i_max_size = max_size; |
|
if (max_size >= ci->i_wanted_max_size) { |
|
ci->i_wanted_max_size = 0; /* reset */ |
|
ci->i_requested_max_size = 0; |
|
} |
|
wake = true; |
|
} |
|
} |
|
|
|
/* check cap bits */ |
|
wanted = __ceph_caps_wanted(ci); |
|
used = __ceph_caps_used(ci); |
|
dirty = __ceph_caps_dirty(ci); |
|
dout(" my wanted = %s, used = %s, dirty %s\n", |
|
ceph_cap_string(wanted), |
|
ceph_cap_string(used), |
|
ceph_cap_string(dirty)); |
|
|
|
if ((was_stale || le32_to_cpu(grant->op) == CEPH_CAP_OP_IMPORT) && |
|
(wanted & ~(cap->mds_wanted | newcaps))) { |
|
/* |
|
* If mds is importing cap, prior cap messages that update |
|
* 'wanted' may get dropped by mds (migrate seq mismatch). |
|
* |
|
* We don't send cap message to update 'wanted' if what we |
|
* want are already issued. If mds revokes caps, cap message |
|
* that releases caps also tells mds what we want. But if |
|
* caps got revoked by mds forcedly (session stale). We may |
|
* haven't told mds what we want. |
|
*/ |
|
check_caps = 1; |
|
} |
|
|
|
/* revocation, grant, or no-op? */ |
|
if (cap->issued & ~newcaps) { |
|
int revoking = cap->issued & ~newcaps; |
|
|
|
dout("revocation: %s -> %s (revoking %s)\n", |
|
ceph_cap_string(cap->issued), |
|
ceph_cap_string(newcaps), |
|
ceph_cap_string(revoking)); |
|
if (S_ISREG(inode->i_mode) && |
|
(revoking & used & CEPH_CAP_FILE_BUFFER)) |
|
writeback = true; /* initiate writeback; will delay ack */ |
|
else if (queue_invalidate && |
|
revoking == CEPH_CAP_FILE_CACHE && |
|
(newcaps & CEPH_CAP_FILE_LAZYIO) == 0) |
|
; /* do nothing yet, invalidation will be queued */ |
|
else if (cap == ci->i_auth_cap) |
|
check_caps = 1; /* check auth cap only */ |
|
else |
|
check_caps = 2; /* check all caps */ |
|
cap->issued = newcaps; |
|
cap->implemented |= newcaps; |
|
} else if (cap->issued == newcaps) { |
|
dout("caps unchanged: %s -> %s\n", |
|
ceph_cap_string(cap->issued), ceph_cap_string(newcaps)); |
|
} else { |
|
dout("grant: %s -> %s\n", ceph_cap_string(cap->issued), |
|
ceph_cap_string(newcaps)); |
|
/* non-auth MDS is revoking the newly grant caps ? */ |
|
if (cap == ci->i_auth_cap && |
|
__ceph_caps_revoking_other(ci, cap, newcaps)) |
|
check_caps = 2; |
|
|
|
cap->issued = newcaps; |
|
cap->implemented |= newcaps; /* add bits only, to |
|
* avoid stepping on a |
|
* pending revocation */ |
|
wake = true; |
|
} |
|
BUG_ON(cap->issued & ~cap->implemented); |
|
|
|
if (extra_info->inline_version > 0 && |
|
extra_info->inline_version >= ci->i_inline_version) { |
|
ci->i_inline_version = extra_info->inline_version; |
|
if (ci->i_inline_version != CEPH_INLINE_NONE && |
|
(newcaps & (CEPH_CAP_FILE_CACHE|CEPH_CAP_FILE_LAZYIO))) |
|
fill_inline = true; |
|
} |
|
|
|
if (ci->i_auth_cap == cap && |
|
le32_to_cpu(grant->op) == CEPH_CAP_OP_IMPORT) { |
|
if (newcaps & ~extra_info->issued) |
|
wake = true; |
|
|
|
if (ci->i_requested_max_size > max_size || |
|
!(le32_to_cpu(grant->wanted) & CEPH_CAP_ANY_FILE_WR)) { |
|
/* re-request max_size if necessary */ |
|
ci->i_requested_max_size = 0; |
|
wake = true; |
|
} |
|
|
|
ceph_kick_flushing_inode_caps(session, ci); |
|
spin_unlock(&ci->i_ceph_lock); |
|
up_read(&session->s_mdsc->snap_rwsem); |
|
} else { |
|
spin_unlock(&ci->i_ceph_lock); |
|
} |
|
|
|
if (fill_inline) |
|
ceph_fill_inline_data(inode, NULL, extra_info->inline_data, |
|
extra_info->inline_len); |
|
|
|
if (queue_trunc) |
|
ceph_queue_vmtruncate(inode); |
|
|
|
if (writeback) |
|
/* |
|
* queue inode for writeback: we can't actually call |
|
* filemap_write_and_wait, etc. from message handler |
|
* context. |
|
*/ |
|
ceph_queue_writeback(inode); |
|
if (queue_invalidate) |
|
ceph_queue_invalidate(inode); |
|
if (deleted_inode) |
|
invalidate_aliases(inode); |
|
if (wake) |
|
wake_up_all(&ci->i_cap_wq); |
|
|
|
mutex_unlock(&session->s_mutex); |
|
if (check_caps == 1) |
|
ceph_check_caps(ci, CHECK_CAPS_AUTHONLY | CHECK_CAPS_NOINVAL, |
|
session); |
|
else if (check_caps == 2) |
|
ceph_check_caps(ci, CHECK_CAPS_NOINVAL, session); |
|
} |
|
|
|
/* |
|
* Handle FLUSH_ACK from MDS, indicating that metadata we sent to the |
|
* MDS has been safely committed. |
|
*/ |
|
static void handle_cap_flush_ack(struct inode *inode, u64 flush_tid, |
|
struct ceph_mds_caps *m, |
|
struct ceph_mds_session *session, |
|
struct ceph_cap *cap) |
|
__releases(ci->i_ceph_lock) |
|
{ |
|
struct ceph_inode_info *ci = ceph_inode(inode); |
|
struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc; |
|
struct ceph_cap_flush *cf, *tmp_cf; |
|
LIST_HEAD(to_remove); |
|
unsigned seq = le32_to_cpu(m->seq); |
|
int dirty = le32_to_cpu(m->dirty); |
|
int cleaned = 0; |
|
bool drop = false; |
|
bool wake_ci = false; |
|
bool wake_mdsc = false; |
|
|
|
list_for_each_entry_safe(cf, tmp_cf, &ci->i_cap_flush_list, i_list) { |
|
/* Is this the one that was flushed? */ |
|
if (cf->tid == flush_tid) |
|
cleaned = cf->caps; |
|
|
|
/* Is this a capsnap? */ |
|
if (cf->is_capsnap) |
|
continue; |
|
|
|
if (cf->tid <= flush_tid) { |
|
/* |
|
* An earlier or current tid. The FLUSH_ACK should |
|
* represent a superset of this flush's caps. |
|
*/ |
|
wake_ci |= __detach_cap_flush_from_ci(ci, cf); |
|
list_add_tail(&cf->i_list, &to_remove); |
|
} else { |
|
/* |
|
* This is a later one. Any caps in it are still dirty |
|
* so don't count them as cleaned. |
|
*/ |
|
cleaned &= ~cf->caps; |
|
if (!cleaned) |
|
break; |
|
} |
|
} |
|
|
|
dout("handle_cap_flush_ack inode %p mds%d seq %d on %s cleaned %s," |
|
" flushing %s -> %s\n", |
|
inode, session->s_mds, seq, ceph_cap_string(dirty), |
|
ceph_cap_string(cleaned), ceph_cap_string(ci->i_flushing_caps), |
|
ceph_cap_string(ci->i_flushing_caps & ~cleaned)); |
|
|
|
if (list_empty(&to_remove) && !cleaned) |
|
goto out; |
|
|
|
ci->i_flushing_caps &= ~cleaned; |
|
|
|
spin_lock(&mdsc->cap_dirty_lock); |
|
|
|
list_for_each_entry(cf, &to_remove, i_list) |
|
wake_mdsc |= __detach_cap_flush_from_mdsc(mdsc, cf); |
|
|
|
if (ci->i_flushing_caps == 0) { |
|
if (list_empty(&ci->i_cap_flush_list)) { |
|
list_del_init(&ci->i_flushing_item); |
|
if (!list_empty(&session->s_cap_flushing)) { |
|
dout(" mds%d still flushing cap on %p\n", |
|
session->s_mds, |
|
&list_first_entry(&session->s_cap_flushing, |
|
struct ceph_inode_info, |
|
i_flushing_item)->vfs_inode); |
|
} |
|
} |
|
mdsc->num_cap_flushing--; |
|
dout(" inode %p now !flushing\n", inode); |
|
|
|
if (ci->i_dirty_caps == 0) { |
|
dout(" inode %p now clean\n", inode); |
|
BUG_ON(!list_empty(&ci->i_dirty_item)); |
|
drop = true; |
|
if (ci->i_wr_ref == 0 && |
|
ci->i_wrbuffer_ref_head == 0) { |
|
BUG_ON(!ci->i_head_snapc); |
|
ceph_put_snap_context(ci->i_head_snapc); |
|
ci->i_head_snapc = NULL; |
|
} |
|
} else { |
|
BUG_ON(list_empty(&ci->i_dirty_item)); |
|
} |
|
} |
|
spin_unlock(&mdsc->cap_dirty_lock); |
|
|
|
out: |
|
spin_unlock(&ci->i_ceph_lock); |
|
|
|
while (!list_empty(&to_remove)) { |
|
cf = list_first_entry(&to_remove, |
|
struct ceph_cap_flush, i_list); |
|
list_del_init(&cf->i_list); |
|
if (!cf->is_capsnap) |
|
ceph_free_cap_flush(cf); |
|
} |
|
|
|
if (wake_ci) |
|
wake_up_all(&ci->i_cap_wq); |
|
if (wake_mdsc) |
|
wake_up_all(&mdsc->cap_flushing_wq); |
|
if (drop) |
|
iput(inode); |
|
} |
|
|
|
void __ceph_remove_capsnap(struct inode *inode, struct ceph_cap_snap *capsnap, |
|
bool *wake_ci, bool *wake_mdsc) |
|
{ |
|
struct ceph_inode_info *ci = ceph_inode(inode); |
|
struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc; |
|
bool ret; |
|
|
|
lockdep_assert_held(&ci->i_ceph_lock); |
|
|
|
dout("removing capsnap %p, inode %p ci %p\n", capsnap, inode, ci); |
|
|
|
list_del_init(&capsnap->ci_item); |
|
ret = __detach_cap_flush_from_ci(ci, &capsnap->cap_flush); |
|
if (wake_ci) |
|
*wake_ci = ret; |
|
|
|
spin_lock(&mdsc->cap_dirty_lock); |
|
if (list_empty(&ci->i_cap_flush_list)) |
|
list_del_init(&ci->i_flushing_item); |
|
|
|
ret = __detach_cap_flush_from_mdsc(mdsc, &capsnap->cap_flush); |
|
if (wake_mdsc) |
|
*wake_mdsc = ret; |
|
spin_unlock(&mdsc->cap_dirty_lock); |
|
} |
|
|
|
void ceph_remove_capsnap(struct inode *inode, struct ceph_cap_snap *capsnap, |
|
bool *wake_ci, bool *wake_mdsc) |
|
{ |
|
struct ceph_inode_info *ci = ceph_inode(inode); |
|
|
|
lockdep_assert_held(&ci->i_ceph_lock); |
|
|
|
WARN_ON_ONCE(capsnap->dirty_pages || capsnap->writing); |
|
__ceph_remove_capsnap(inode, capsnap, wake_ci, wake_mdsc); |
|
} |
|
|
|
/* |
|
* Handle FLUSHSNAP_ACK. MDS has flushed snap data to disk and we can |
|
* throw away our cap_snap. |
|
* |
|
* Caller hold s_mutex. |
|
*/ |
|
static void handle_cap_flushsnap_ack(struct inode *inode, u64 flush_tid, |
|
struct ceph_mds_caps *m, |
|
struct ceph_mds_session *session) |
|
{ |
|
struct ceph_inode_info *ci = ceph_inode(inode); |
|
struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc; |
|
u64 follows = le64_to_cpu(m->snap_follows); |
|
struct ceph_cap_snap *capsnap; |
|
bool flushed = false; |
|
bool wake_ci = false; |
|
bool wake_mdsc = false; |
|
|
|
dout("handle_cap_flushsnap_ack inode %p ci %p mds%d follows %lld\n", |
|
inode, ci, session->s_mds, follows); |
|
|
|
spin_lock(&ci->i_ceph_lock); |
|
list_for_each_entry(capsnap, &ci->i_cap_snaps, ci_item) { |
|
if (capsnap->follows == follows) { |
|
if (capsnap->cap_flush.tid != flush_tid) { |
|
dout(" cap_snap %p follows %lld tid %lld !=" |
|
" %lld\n", capsnap, follows, |
|
flush_tid, capsnap->cap_flush.tid); |
|
break; |
|
} |
|
flushed = true; |
|
break; |
|
} else { |
|
dout(" skipping cap_snap %p follows %lld\n", |
|
capsnap, capsnap->follows); |
|
} |
|
} |
|
if (flushed) |
|
ceph_remove_capsnap(inode, capsnap, &wake_ci, &wake_mdsc); |
|
spin_unlock(&ci->i_ceph_lock); |
|
|
|
if (flushed) { |
|
ceph_put_snap_context(capsnap->context); |
|
ceph_put_cap_snap(capsnap); |
|
if (wake_ci) |
|
wake_up_all(&ci->i_cap_wq); |
|
if (wake_mdsc) |
|
wake_up_all(&mdsc->cap_flushing_wq); |
|
iput(inode); |
|
} |
|
} |
|
|
|
/* |
|
* Handle TRUNC from MDS, indicating file truncation. |
|
* |
|
* caller hold s_mutex. |
|
*/ |
|
static bool handle_cap_trunc(struct inode *inode, |
|
struct ceph_mds_caps *trunc, |
|
struct ceph_mds_session *session) |
|
{ |
|
struct ceph_inode_info *ci = ceph_inode(inode); |
|
int mds = session->s_mds; |
|
int seq = le32_to_cpu(trunc->seq); |
|
u32 truncate_seq = le32_to_cpu(trunc->truncate_seq); |
|
u64 truncate_size = le64_to_cpu(trunc->truncate_size); |
|
u64 size = le64_to_cpu(trunc->size); |
|
int implemented = 0; |
|
int dirty = __ceph_caps_dirty(ci); |
|
int issued = __ceph_caps_issued(ceph_inode(inode), &implemented); |
|
bool queue_trunc = false; |
|
|
|
lockdep_assert_held(&ci->i_ceph_lock); |
|
|
|
issued |= implemented | dirty; |
|
|
|
dout("handle_cap_trunc inode %p mds%d seq %d to %lld seq %d\n", |
|
inode, mds, seq, truncate_size, truncate_seq); |
|
queue_trunc = ceph_fill_file_size(inode, issued, |
|
truncate_seq, truncate_size, size); |
|
return queue_trunc; |
|
} |
|
|
|
/* |
|
* Handle EXPORT from MDS. Cap is being migrated _from_ this mds to a |
|
* different one. If we are the most recent migration we've seen (as |
|
* indicated by mseq), make note of the migrating cap bits for the |
|
* duration (until we see the corresponding IMPORT). |
|
* |
|
* caller holds s_mutex |
|
*/ |
|
static void handle_cap_export(struct inode *inode, struct ceph_mds_caps *ex, |
|
struct ceph_mds_cap_peer *ph, |
|
struct ceph_mds_session *session) |
|
{ |
|
struct ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc; |
|
struct ceph_mds_session *tsession = NULL; |
|
struct ceph_cap *cap, *tcap, *new_cap = NULL; |
|
struct ceph_inode_info *ci = ceph_inode(inode); |
|
u64 t_cap_id; |
|
unsigned mseq = le32_to_cpu(ex->migrate_seq); |
|
unsigned t_seq, t_mseq; |
|
int target, issued; |
|
int mds = session->s_mds; |
|
|
|
if (ph) { |
|
t_cap_id = le64_to_cpu(ph->cap_id); |
|
t_seq = le32_to_cpu(ph->seq); |
|
t_mseq = le32_to_cpu(ph->mseq); |
|
target = le32_to_cpu(ph->mds); |
|
} else { |
|
t_cap_id = t_seq = t_mseq = 0; |
|
target = -1; |
|
} |
|
|
|
dout("handle_cap_export inode %p ci %p mds%d mseq %d target %d\n", |
|
inode, ci, mds, mseq, target); |
|
retry: |
|
spin_lock(&ci->i_ceph_lock); |
|
cap = __get_cap_for_mds(ci, mds); |
|
if (!cap || cap->cap_id != le64_to_cpu(ex->cap_id)) |
|
goto out_unlock; |
|
|
|
if (target < 0) { |
|
ceph_remove_cap(cap, false); |
|
goto out_unlock; |
|
} |
|
|
|
/* |
|
* now we know we haven't received the cap import message yet |
|
* because the exported cap still exist. |
|
*/ |
|
|
|
issued = cap->issued; |
|
if (issued != cap->implemented) |
|
pr_err_ratelimited("handle_cap_export: issued != implemented: " |
|
"ino (%llx.%llx) mds%d seq %d mseq %d " |
|
"issued %s implemented %s\n", |
|
ceph_vinop(inode), mds, cap->seq, cap->mseq, |
|
ceph_cap_string(issued), |
|
ceph_cap_string(cap->implemented)); |
|
|
|
|
|
tcap = __get_cap_for_mds(ci, target); |
|
if (tcap) { |
|
/* already have caps from the target */ |
|
if (tcap->cap_id == t_cap_id && |
|
ceph_seq_cmp(tcap->seq, t_seq) < 0) { |
|
dout(" updating import cap %p mds%d\n", tcap, target); |
|
tcap->cap_id = t_cap_id; |
|
tcap->seq = t_seq - 1; |
|
tcap->issue_seq = t_seq - 1; |
|
tcap->issued |= issued; |
|
tcap->implemented |= issued; |
|
if (cap == ci->i_auth_cap) { |
|
ci->i_auth_cap = tcap; |
|
change_auth_cap_ses(ci, tcap->session); |
|
} |
|
} |
|
ceph_remove_cap(cap, false); |
|
goto out_unlock; |
|
} else if (tsession) { |
|
/* add placeholder for the export tagert */ |
|
int flag = (cap == ci->i_auth_cap) ? CEPH_CAP_FLAG_AUTH : 0; |
|
tcap = new_cap; |
|
ceph_add_cap(inode, tsession, t_cap_id, issued, 0, |
|
t_seq - 1, t_mseq, (u64)-1, flag, &new_cap); |
|
|
|
if (!list_empty(&ci->i_cap_flush_list) && |
|
ci->i_auth_cap == tcap) { |
|
spin_lock(&mdsc->cap_dirty_lock); |
|
list_move_tail(&ci->i_flushing_item, |
|
&tcap->session->s_cap_flushing); |
|
spin_unlock(&mdsc->cap_dirty_lock); |
|
} |
|
|
|
ceph_remove_cap(cap, false); |
|
goto out_unlock; |
|
} |
|
|
|
spin_unlock(&ci->i_ceph_lock); |
|
mutex_unlock(&session->s_mutex); |
|
|
|
/* open target session */ |
|
tsession = ceph_mdsc_open_export_target_session(mdsc, target); |
|
if (!IS_ERR(tsession)) { |
|
if (mds > target) { |
|
mutex_lock(&session->s_mutex); |
|
mutex_lock_nested(&tsession->s_mutex, |
|
SINGLE_DEPTH_NESTING); |
|
} else { |
|
mutex_lock(&tsession->s_mutex); |
|
mutex_lock_nested(&session->s_mutex, |
|
SINGLE_DEPTH_NESTING); |
|
} |
|
new_cap = ceph_get_cap(mdsc, NULL); |
|
} else { |
|
WARN_ON(1); |
|
tsession = NULL; |
|
target = -1; |
|
mutex_lock(&session->s_mutex); |
|
} |
|
goto retry; |
|
|
|
out_unlock: |
|
spin_unlock(&ci->i_ceph_lock); |
|
mutex_unlock(&session->s_mutex); |
|
if (tsession) { |
|
mutex_unlock(&tsession->s_mutex); |
|
ceph_put_mds_session(tsession); |
|
} |
|
if (new_cap) |
|
ceph_put_cap(mdsc, new_cap); |
|
} |
|
|
|
/* |
|
* Handle cap IMPORT. |
|
* |
|
* caller holds s_mutex. acquires i_ceph_lock |
|
*/ |
|
static void handle_cap_import(struct ceph_mds_client *mdsc, |
|
struct inode *inode, struct ceph_mds_caps *im, |
|
struct ceph_mds_cap_peer *ph, |
|
struct ceph_mds_session *session, |
|
struct ceph_cap **target_cap, int *old_issued) |
|
{ |
|
struct ceph_inode_info *ci = ceph_inode(inode); |
|
struct ceph_cap *cap, *ocap, *new_cap = NULL; |
|
int mds = session->s_mds; |
|
int issued; |
|
unsigned caps = le32_to_cpu(im->caps); |
|
unsigned wanted = le32_to_cpu(im->wanted); |
|
unsigned seq = le32_to_cpu(im->seq); |
|
unsigned mseq = le32_to_cpu(im->migrate_seq); |
|
u64 realmino = le64_to_cpu(im->realm); |
|
u64 cap_id = le64_to_cpu(im->cap_id); |
|
u64 p_cap_id; |
|
int peer; |
|
|
|
if (ph) { |
|
p_cap_id = le64_to_cpu(ph->cap_id); |
|
peer = le32_to_cpu(ph->mds); |
|
} else { |
|
p_cap_id = 0; |
|
peer = -1; |
|
} |
|
|
|
dout("handle_cap_import inode %p ci %p mds%d mseq %d peer %d\n", |
|
inode, ci, mds, mseq, peer); |
|
retry: |
|
cap = __get_cap_for_mds(ci, mds); |
|
if (!cap) { |
|
if (!new_cap) { |
|
spin_unlock(&ci->i_ceph_lock); |
|
new_cap = ceph_get_cap(mdsc, NULL); |
|
spin_lock(&ci->i_ceph_lock); |
|
goto retry; |
|
} |
|
cap = new_cap; |
|
} else { |
|
if (new_cap) { |
|
ceph_put_cap(mdsc, new_cap); |
|
new_cap = NULL; |
|
} |
|
} |
|
|
|
__ceph_caps_issued(ci, &issued); |
|
issued |= __ceph_caps_dirty(ci); |
|
|
|
ceph_add_cap(inode, session, cap_id, caps, wanted, seq, mseq, |
|
realmino, CEPH_CAP_FLAG_AUTH, &new_cap); |
|
|
|
ocap = peer >= 0 ? __get_cap_for_mds(ci, peer) : NULL; |
|
if (ocap && ocap->cap_id == p_cap_id) { |
|
dout(" remove export cap %p mds%d flags %d\n", |
|
ocap, peer, ph->flags); |
|
if ((ph->flags & CEPH_CAP_FLAG_AUTH) && |
|
(ocap->seq != le32_to_cpu(ph->seq) || |
|
ocap->mseq != le32_to_cpu(ph->mseq))) { |
|
pr_err_ratelimited("handle_cap_import: " |
|
"mismatched seq/mseq: ino (%llx.%llx) " |
|
"mds%d seq %d mseq %d importer mds%d " |
|
"has peer seq %d mseq %d\n", |
|
ceph_vinop(inode), peer, ocap->seq, |
|
ocap->mseq, mds, le32_to_cpu(ph->seq), |
|
le32_to_cpu(ph->mseq)); |
|
} |
|
ceph_remove_cap(ocap, (ph->flags & CEPH_CAP_FLAG_RELEASE)); |
|
} |
|
|
|
*old_issued = issued; |
|
*target_cap = cap; |
|
} |
|
|
|
/* |
|
* Handle a caps message from the MDS. |
|
* |
|
* Identify the appropriate session, inode, and call the right handler |
|
* based on the cap op. |
|
*/ |
|
void ceph_handle_caps(struct ceph_mds_session *session, |
|
struct ceph_msg *msg) |
|
{ |
|
struct ceph_mds_client *mdsc = session->s_mdsc; |
|
struct inode *inode; |
|
struct ceph_inode_info *ci; |
|
struct ceph_cap *cap; |
|
struct ceph_mds_caps *h; |
|
struct ceph_mds_cap_peer *peer = NULL; |
|
struct ceph_snap_realm *realm = NULL; |
|
int op; |
|
int msg_version = le16_to_cpu(msg->hdr.version); |
|
u32 seq, mseq; |
|
struct ceph_vino vino; |
|
void *snaptrace; |
|
size_t snaptrace_len; |
|
void *p, *end; |
|
struct cap_extra_info extra_info = {}; |
|
bool queue_trunc; |
|
|
|
dout("handle_caps from mds%d\n", session->s_mds); |
|
|
|
/* decode */ |
|
end = msg->front.iov_base + msg->front.iov_len; |
|
if (msg->front.iov_len < sizeof(*h)) |
|
goto bad; |
|
h = msg->front.iov_base; |
|
op = le32_to_cpu(h->op); |
|
vino.ino = le64_to_cpu(h->ino); |
|
vino.snap = CEPH_NOSNAP; |
|
seq = le32_to_cpu(h->seq); |
|
mseq = le32_to_cpu(h->migrate_seq); |
|
|
|
snaptrace = h + 1; |
|
snaptrace_len = le32_to_cpu(h->snap_trace_len); |
|
p = snaptrace + snaptrace_len; |
|
|
|
if (msg_version >= 2) { |
|
u32 flock_len; |
|
ceph_decode_32_safe(&p, end, flock_len, bad); |
|
if (p + flock_len > end) |
|
goto bad; |
|
p += flock_len; |
|
} |
|
|
|
if (msg_version >= 3) { |
|
if (op == CEPH_CAP_OP_IMPORT) { |
|
if (p + sizeof(*peer) > end) |
|
goto bad; |
|
peer = p; |
|
p += sizeof(*peer); |
|
} else if (op == CEPH_CAP_OP_EXPORT) { |
|
/* recorded in unused fields */ |
|
peer = (void *)&h->size; |
|
} |
|
} |
|
|
|
if (msg_version >= 4) { |
|
ceph_decode_64_safe(&p, end, extra_info.inline_version, bad); |
|
ceph_decode_32_safe(&p, end, extra_info.inline_len, bad); |
|
if (p + extra_info.inline_len > end) |
|
goto bad; |
|
extra_info.inline_data = p; |
|
p += extra_info.inline_len; |
|
} |
|
|
|
if (msg_version >= 5) { |
|
struct ceph_osd_client *osdc = &mdsc->fsc->client->osdc; |
|
u32 epoch_barrier; |
|
|
|
ceph_decode_32_safe(&p, end, epoch_barrier, bad); |
|
ceph_osdc_update_epoch_barrier(osdc, epoch_barrier); |
|
} |
|
|
|
if (msg_version >= 8) { |
|
u32 pool_ns_len; |
|
|
|
/* version >= 6 */ |
|
ceph_decode_skip_64(&p, end, bad); // flush_tid |
|
/* version >= 7 */ |
|
ceph_decode_skip_32(&p, end, bad); // caller_uid |
|
ceph_decode_skip_32(&p, end, bad); // caller_gid |
|
/* version >= 8 */ |
|
ceph_decode_32_safe(&p, end, pool_ns_len, bad); |
|
if (pool_ns_len > 0) { |
|
ceph_decode_need(&p, end, pool_ns_len, bad); |
|
extra_info.pool_ns = |
|
ceph_find_or_create_string(p, pool_ns_len); |
|
p += pool_ns_len; |
|
} |
|
} |
|
|
|
if (msg_version >= 9) { |
|
struct ceph_timespec *btime; |
|
|
|
if (p + sizeof(*btime) > end) |
|
goto bad; |
|
btime = p; |
|
ceph_decode_timespec64(&extra_info.btime, btime); |
|
p += sizeof(*btime); |
|
ceph_decode_64_safe(&p, end, extra_info.change_attr, bad); |
|
} |
|
|
|
if (msg_version >= 11) { |
|
/* version >= 10 */ |
|
ceph_decode_skip_32(&p, end, bad); // flags |
|
/* version >= 11 */ |
|
extra_info.dirstat_valid = true; |
|
ceph_decode_64_safe(&p, end, extra_info.nfiles, bad); |
|
ceph_decode_64_safe(&p, end, extra_info.nsubdirs, bad); |
|
} |
|
|
|
/* lookup ino */ |
|
inode = ceph_find_inode(mdsc->fsc->sb, vino); |
|
ci = ceph_inode(inode); |
|
dout(" op %s ino %llx.%llx inode %p\n", ceph_cap_op_name(op), vino.ino, |
|
vino.snap, inode); |
|
|
|
mutex_lock(&session->s_mutex); |
|
inc_session_sequence(session); |
|
dout(" mds%d seq %lld cap seq %u\n", session->s_mds, session->s_seq, |
|
(unsigned)seq); |
|
|
|
if (!inode) { |
|
dout(" i don't have ino %llx\n", vino.ino); |
|
|
|
if (op == CEPH_CAP_OP_IMPORT) { |
|
cap = ceph_get_cap(mdsc, NULL); |
|
cap->cap_ino = vino.ino; |
|
cap->queue_release = 1; |
|
cap->cap_id = le64_to_cpu(h->cap_id); |
|
cap->mseq = mseq; |
|
cap->seq = seq; |
|
cap->issue_seq = seq; |
|
spin_lock(&session->s_cap_lock); |
|
__ceph_queue_cap_release(session, cap); |
|
spin_unlock(&session->s_cap_lock); |
|
} |
|
goto flush_cap_releases; |
|
} |
|
|
|
/* these will work even if we don't have a cap yet */ |
|
switch (op) { |
|
case CEPH_CAP_OP_FLUSHSNAP_ACK: |
|
handle_cap_flushsnap_ack(inode, le64_to_cpu(msg->hdr.tid), |
|
h, session); |
|
goto done; |
|
|
|
case CEPH_CAP_OP_EXPORT: |
|
handle_cap_export(inode, h, peer, session); |
|
goto done_unlocked; |
|
|
|
case CEPH_CAP_OP_IMPORT: |
|
realm = NULL; |
|
if (snaptrace_len) { |
|
down_write(&mdsc->snap_rwsem); |
|
ceph_update_snap_trace(mdsc, snaptrace, |
|
snaptrace + snaptrace_len, |
|
false, &realm); |
|
downgrade_write(&mdsc->snap_rwsem); |
|
} else { |
|
down_read(&mdsc->snap_rwsem); |
|
} |
|
spin_lock(&ci->i_ceph_lock); |
|
handle_cap_import(mdsc, inode, h, peer, session, |
|
&cap, &extra_info.issued); |
|
handle_cap_grant(inode, session, cap, |
|
h, msg->middle, &extra_info); |
|
if (realm) |
|
ceph_put_snap_realm(mdsc, realm); |
|
goto done_unlocked; |
|
} |
|
|
|
/* the rest require a cap */ |
|
spin_lock(&ci->i_ceph_lock); |
|
cap = __get_cap_for_mds(ceph_inode(inode), session->s_mds); |
|
if (!cap) { |
|
dout(" no cap on %p ino %llx.%llx from mds%d\n", |
|
inode, ceph_ino(inode), ceph_snap(inode), |
|
session->s_mds); |
|
spin_unlock(&ci->i_ceph_lock); |
|
goto flush_cap_releases; |
|
} |
|
|
|
/* note that each of these drops i_ceph_lock for us */ |
|
switch (op) { |
|
case CEPH_CAP_OP_REVOKE: |
|
case CEPH_CAP_OP_GRANT: |
|
__ceph_caps_issued(ci, &extra_info.issued); |
|
extra_info.issued |= __ceph_caps_dirty(ci); |
|
handle_cap_grant(inode, session, cap, |
|
h, msg->middle, &extra_info); |
|
goto done_unlocked; |
|
|
|
case CEPH_CAP_OP_FLUSH_ACK: |
|
handle_cap_flush_ack(inode, le64_to_cpu(msg->hdr.tid), |
|
h, session, cap); |
|
break; |
|
|
|
case CEPH_CAP_OP_TRUNC: |
|
queue_trunc = handle_cap_trunc(inode, h, session); |
|
spin_unlock(&ci->i_ceph_lock); |
|
if (queue_trunc) |
|
ceph_queue_vmtruncate(inode); |
|
break; |
|
|
|
default: |
|
spin_unlock(&ci->i_ceph_lock); |
|
pr_err("ceph_handle_caps: unknown cap op %d %s\n", op, |
|
ceph_cap_op_name(op)); |
|
} |
|
|
|
done: |
|
mutex_unlock(&session->s_mutex); |
|
done_unlocked: |
|
iput(inode); |
|
out: |
|
ceph_put_string(extra_info.pool_ns); |
|
return; |
|
|
|
flush_cap_releases: |
|
/* |
|
* send any cap release message to try to move things |
|
* along for the mds (who clearly thinks we still have this |
|
* cap). |
|
*/ |
|
ceph_flush_cap_releases(mdsc, session); |
|
goto done; |
|
|
|
bad: |
|
pr_err("ceph_handle_caps: corrupt message\n"); |
|
ceph_msg_dump(msg); |
|
goto out; |
|
} |
|
|
|
/* |
|
* Delayed work handler to process end of delayed cap release LRU list. |
|
* |
|
* If new caps are added to the list while processing it, these won't get |
|
* processed in this run. In this case, the ci->i_hold_caps_max will be |
|
* returned so that the work can be scheduled accordingly. |
|
*/ |
|
unsigned long ceph_check_delayed_caps(struct ceph_mds_client *mdsc) |
|
{ |
|
struct inode *inode; |
|
struct ceph_inode_info *ci; |
|
struct ceph_mount_options *opt = mdsc->fsc->mount_options; |
|
unsigned long delay_max = opt->caps_wanted_delay_max * HZ; |
|
unsigned long loop_start = jiffies; |
|
unsigned long delay = 0; |
|
|
|
dout("check_delayed_caps\n"); |
|
spin_lock(&mdsc->cap_delay_lock); |
|
while (!list_empty(&mdsc->cap_delay_list)) { |
|
ci = list_first_entry(&mdsc->cap_delay_list, |
|
struct ceph_inode_info, |
|
i_cap_delay_list); |
|
if (time_before(loop_start, ci->i_hold_caps_max - delay_max)) { |
|
dout("%s caps added recently. Exiting loop", __func__); |
|
delay = ci->i_hold_caps_max; |
|
break; |
|
} |
|
if ((ci->i_ceph_flags & CEPH_I_FLUSH) == 0 && |
|
time_before(jiffies, ci->i_hold_caps_max)) |
|
break; |
|
list_del_init(&ci->i_cap_delay_list); |
|
|
|
inode = igrab(&ci->vfs_inode); |
|
if (inode) { |
|
spin_unlock(&mdsc->cap_delay_lock); |
|
dout("check_delayed_caps on %p\n", inode); |
|
ceph_check_caps(ci, 0, NULL); |
|
iput(inode); |
|
spin_lock(&mdsc->cap_delay_lock); |
|
} |
|
} |
|
spin_unlock(&mdsc->cap_delay_lock); |
|
|
|
return delay; |
|
} |
|
|
|
/* |
|
* Flush all dirty caps to the mds |
|
*/ |
|
static void flush_dirty_session_caps(struct ceph_mds_session *s) |
|
{ |
|
struct ceph_mds_client *mdsc = s->s_mdsc; |
|
struct ceph_inode_info *ci; |
|
struct inode *inode; |
|
|
|
dout("flush_dirty_caps\n"); |
|
spin_lock(&mdsc->cap_dirty_lock); |
|
while (!list_empty(&s->s_cap_dirty)) { |
|
ci = list_first_entry(&s->s_cap_dirty, struct ceph_inode_info, |
|
i_dirty_item); |
|
inode = &ci->vfs_inode; |
|
ihold(inode); |
|
dout("flush_dirty_caps %p\n", inode); |
|
spin_unlock(&mdsc->cap_dirty_lock); |
|
ceph_check_caps(ci, CHECK_CAPS_FLUSH, NULL); |
|
iput(inode); |
|
spin_lock(&mdsc->cap_dirty_lock); |
|
} |
|
spin_unlock(&mdsc->cap_dirty_lock); |
|
dout("flush_dirty_caps done\n"); |
|
} |
|
|
|
void ceph_flush_dirty_caps(struct ceph_mds_client *mdsc) |
|
{ |
|
ceph_mdsc_iterate_sessions(mdsc, flush_dirty_session_caps, true); |
|
} |
|
|
|
void __ceph_touch_fmode(struct ceph_inode_info *ci, |
|
struct ceph_mds_client *mdsc, int fmode) |
|
{ |
|
unsigned long now = jiffies; |
|
if (fmode & CEPH_FILE_MODE_RD) |
|
ci->i_last_rd = now; |
|
if (fmode & CEPH_FILE_MODE_WR) |
|
ci->i_last_wr = now; |
|
/* queue periodic check */ |
|
if (fmode && |
|
__ceph_is_any_real_caps(ci) && |
|
list_empty(&ci->i_cap_delay_list)) |
|
__cap_delay_requeue(mdsc, ci); |
|
} |
|
|
|
void ceph_get_fmode(struct ceph_inode_info *ci, int fmode, int count) |
|
{ |
|
struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(ci->vfs_inode.i_sb); |
|
int bits = (fmode << 1) | 1; |
|
bool is_opened = false; |
|
int i; |
|
|
|
if (count == 1) |
|
atomic64_inc(&mdsc->metric.opened_files); |
|
|
|
spin_lock(&ci->i_ceph_lock); |
|
for (i = 0; i < CEPH_FILE_MODE_BITS; i++) { |
|
if (bits & (1 << i)) |
|
ci->i_nr_by_mode[i] += count; |
|
|
|
/* |
|
* If any of the mode ref is larger than 1, |
|
* that means it has been already opened by |
|
* others. Just skip checking the PIN ref. |
|
*/ |
|
if (i && ci->i_nr_by_mode[i] > 1) |
|
is_opened = true; |
|
} |
|
|
|
if (!is_opened) |
|
percpu_counter_inc(&mdsc->metric.opened_inodes); |
|
spin_unlock(&ci->i_ceph_lock); |
|
} |
|
|
|
/* |
|
* Drop open file reference. If we were the last open file, |
|
* we may need to release capabilities to the MDS (or schedule |
|
* their delayed release). |
|
*/ |
|
void ceph_put_fmode(struct ceph_inode_info *ci, int fmode, int count) |
|
{ |
|
struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(ci->vfs_inode.i_sb); |
|
int bits = (fmode << 1) | 1; |
|
bool is_closed = true; |
|
int i; |
|
|
|
if (count == 1) |
|
atomic64_dec(&mdsc->metric.opened_files); |
|
|
|
spin_lock(&ci->i_ceph_lock); |
|
for (i = 0; i < CEPH_FILE_MODE_BITS; i++) { |
|
if (bits & (1 << i)) { |
|
BUG_ON(ci->i_nr_by_mode[i] < count); |
|
ci->i_nr_by_mode[i] -= count; |
|
} |
|
|
|
/* |
|
* If any of the mode ref is not 0 after |
|
* decreased, that means it is still opened |
|
* by others. Just skip checking the PIN ref. |
|
*/ |
|
if (i && ci->i_nr_by_mode[i]) |
|
is_closed = false; |
|
} |
|
|
|
if (is_closed) |
|
percpu_counter_dec(&mdsc->metric.opened_inodes); |
|
spin_unlock(&ci->i_ceph_lock); |
|
} |
|
|
|
/* |
|
* For a soon-to-be unlinked file, drop the LINK caps. If it |
|
* looks like the link count will hit 0, drop any other caps (other |
|
* than PIN) we don't specifically want (due to the file still being |
|
* open). |
|
*/ |
|
int ceph_drop_caps_for_unlink(struct inode *inode) |
|
{ |
|
struct ceph_inode_info *ci = ceph_inode(inode); |
|
int drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL; |
|
|
|
spin_lock(&ci->i_ceph_lock); |
|
if (inode->i_nlink == 1) { |
|
drop |= ~(__ceph_caps_wanted(ci) | CEPH_CAP_PIN); |
|
|
|
if (__ceph_caps_dirty(ci)) { |
|
struct ceph_mds_client *mdsc = |
|
ceph_inode_to_client(inode)->mdsc; |
|
__cap_delay_requeue_front(mdsc, ci); |
|
} |
|
} |
|
spin_unlock(&ci->i_ceph_lock); |
|
return drop; |
|
} |
|
|
|
/* |
|
* Helpers for embedding cap and dentry lease releases into mds |
|
* requests. |
|
* |
|
* @force is used by dentry_release (below) to force inclusion of a |
|
* record for the directory inode, even when there aren't any caps to |
|
* drop. |
|
*/ |
|
int ceph_encode_inode_release(void **p, struct inode *inode, |
|
int mds, int drop, int unless, int force) |
|
{ |
|
struct ceph_inode_info *ci = ceph_inode(inode); |
|
struct ceph_cap *cap; |
|
struct ceph_mds_request_release *rel = *p; |
|
int used, dirty; |
|
int ret = 0; |
|
|
|
spin_lock(&ci->i_ceph_lock); |
|
used = __ceph_caps_used(ci); |
|
dirty = __ceph_caps_dirty(ci); |
|
|
|
dout("encode_inode_release %p mds%d used|dirty %s drop %s unless %s\n", |
|
inode, mds, ceph_cap_string(used|dirty), ceph_cap_string(drop), |
|
ceph_cap_string(unless)); |
|
|
|
/* only drop unused, clean caps */ |
|
drop &= ~(used | dirty); |
|
|
|
cap = __get_cap_for_mds(ci, mds); |
|
if (cap && __cap_is_valid(cap)) { |
|
unless &= cap->issued; |
|
if (unless) { |
|
if (unless & CEPH_CAP_AUTH_EXCL) |
|
drop &= ~CEPH_CAP_AUTH_SHARED; |
|
if (unless & CEPH_CAP_LINK_EXCL) |
|
drop &= ~CEPH_CAP_LINK_SHARED; |
|
if (unless & CEPH_CAP_XATTR_EXCL) |
|
drop &= ~CEPH_CAP_XATTR_SHARED; |
|
if (unless & CEPH_CAP_FILE_EXCL) |
|
drop &= ~CEPH_CAP_FILE_SHARED; |
|
} |
|
|
|
if (force || (cap->issued & drop)) { |
|
if (cap->issued & drop) { |
|
int wanted = __ceph_caps_wanted(ci); |
|
dout("encode_inode_release %p cap %p " |
|
"%s -> %s, wanted %s -> %s\n", inode, cap, |
|
ceph_cap_string(cap->issued), |
|
ceph_cap_string(cap->issued & ~drop), |
|
ceph_cap_string(cap->mds_wanted), |
|
ceph_cap_string(wanted)); |
|
|
|
cap->issued &= ~drop; |
|
cap->implemented &= ~drop; |
|
cap->mds_wanted = wanted; |
|
if (cap == ci->i_auth_cap && |
|
!(wanted & CEPH_CAP_ANY_FILE_WR)) |
|
ci->i_requested_max_size = 0; |
|
} else { |
|
dout("encode_inode_release %p cap %p %s" |
|
" (force)\n", inode, cap, |
|
ceph_cap_string(cap->issued)); |
|
} |
|
|
|
rel->ino = cpu_to_le64(ceph_ino(inode)); |
|
rel->cap_id = cpu_to_le64(cap->cap_id); |
|
rel->seq = cpu_to_le32(cap->seq); |
|
rel->issue_seq = cpu_to_le32(cap->issue_seq); |
|
rel->mseq = cpu_to_le32(cap->mseq); |
|
rel->caps = cpu_to_le32(cap->implemented); |
|
rel->wanted = cpu_to_le32(cap->mds_wanted); |
|
rel->dname_len = 0; |
|
rel->dname_seq = 0; |
|
*p += sizeof(*rel); |
|
ret = 1; |
|
} else { |
|
dout("encode_inode_release %p cap %p %s (noop)\n", |
|
inode, cap, ceph_cap_string(cap->issued)); |
|
} |
|
} |
|
spin_unlock(&ci->i_ceph_lock); |
|
return ret; |
|
} |
|
|
|
int ceph_encode_dentry_release(void **p, struct dentry *dentry, |
|
struct inode *dir, |
|
int mds, int drop, int unless) |
|
{ |
|
struct dentry *parent = NULL; |
|
struct ceph_mds_request_release *rel = *p; |
|
struct ceph_dentry_info *di = ceph_dentry(dentry); |
|
int force = 0; |
|
int ret; |
|
|
|
/* |
|
* force an record for the directory caps if we have a dentry lease. |
|
* this is racy (can't take i_ceph_lock and d_lock together), but it |
|
* doesn't have to be perfect; the mds will revoke anything we don't |
|
* release. |
|
*/ |
|
spin_lock(&dentry->d_lock); |
|
if (di->lease_session && di->lease_session->s_mds == mds) |
|
force = 1; |
|
if (!dir) { |
|
parent = dget(dentry->d_parent); |
|
dir = d_inode(parent); |
|
} |
|
spin_unlock(&dentry->d_lock); |
|
|
|
ret = ceph_encode_inode_release(p, dir, mds, drop, unless, force); |
|
dput(parent); |
|
|
|
spin_lock(&dentry->d_lock); |
|
if (ret && di->lease_session && di->lease_session->s_mds == mds) { |
|
dout("encode_dentry_release %p mds%d seq %d\n", |
|
dentry, mds, (int)di->lease_seq); |
|
rel->dname_len = cpu_to_le32(dentry->d_name.len); |
|
memcpy(*p, dentry->d_name.name, dentry->d_name.len); |
|
*p += dentry->d_name.len; |
|
rel->dname_seq = cpu_to_le32(di->lease_seq); |
|
__ceph_mdsc_drop_dentry_lease(dentry); |
|
} |
|
spin_unlock(&dentry->d_lock); |
|
return ret; |
|
}
|
|
|