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576 lines
17 KiB
576 lines
17 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _FS_CEPH_MDS_CLIENT_H |
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#define _FS_CEPH_MDS_CLIENT_H |
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#include <linux/completion.h> |
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#include <linux/kref.h> |
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#include <linux/list.h> |
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#include <linux/mutex.h> |
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#include <linux/rbtree.h> |
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#include <linux/spinlock.h> |
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#include <linux/refcount.h> |
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#include <linux/utsname.h> |
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#include <linux/ktime.h> |
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#include <linux/ceph/types.h> |
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#include <linux/ceph/messenger.h> |
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#include <linux/ceph/mdsmap.h> |
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#include <linux/ceph/auth.h> |
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#include "metric.h" |
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#include "super.h" |
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/* The first 8 bits are reserved for old ceph releases */ |
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enum ceph_feature_type { |
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CEPHFS_FEATURE_MIMIC = 8, |
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CEPHFS_FEATURE_REPLY_ENCODING, |
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CEPHFS_FEATURE_RECLAIM_CLIENT, |
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CEPHFS_FEATURE_LAZY_CAP_WANTED, |
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CEPHFS_FEATURE_MULTI_RECONNECT, |
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CEPHFS_FEATURE_DELEG_INO, |
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CEPHFS_FEATURE_METRIC_COLLECT, |
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CEPHFS_FEATURE_MAX = CEPHFS_FEATURE_METRIC_COLLECT, |
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}; |
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/* |
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* This will always have the highest feature bit value |
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* as the last element of the array. |
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*/ |
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#define CEPHFS_FEATURES_CLIENT_SUPPORTED { \ |
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0, 1, 2, 3, 4, 5, 6, 7, \ |
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CEPHFS_FEATURE_MIMIC, \ |
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CEPHFS_FEATURE_REPLY_ENCODING, \ |
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CEPHFS_FEATURE_LAZY_CAP_WANTED, \ |
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CEPHFS_FEATURE_MULTI_RECONNECT, \ |
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CEPHFS_FEATURE_DELEG_INO, \ |
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CEPHFS_FEATURE_METRIC_COLLECT, \ |
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\ |
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CEPHFS_FEATURE_MAX, \ |
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} |
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#define CEPHFS_FEATURES_CLIENT_REQUIRED {} |
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/* |
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* Some lock dependencies: |
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* |
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* session->s_mutex |
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* mdsc->mutex |
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* |
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* mdsc->snap_rwsem |
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* |
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* ci->i_ceph_lock |
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* mdsc->snap_flush_lock |
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* mdsc->cap_delay_lock |
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* |
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*/ |
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struct ceph_fs_client; |
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struct ceph_cap; |
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/* |
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* parsed info about a single inode. pointers are into the encoded |
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* on-wire structures within the mds reply message payload. |
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*/ |
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struct ceph_mds_reply_info_in { |
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struct ceph_mds_reply_inode *in; |
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struct ceph_dir_layout dir_layout; |
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u32 symlink_len; |
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char *symlink; |
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u32 xattr_len; |
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char *xattr_data; |
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u64 inline_version; |
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u32 inline_len; |
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char *inline_data; |
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u32 pool_ns_len; |
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char *pool_ns_data; |
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u64 max_bytes; |
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u64 max_files; |
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s32 dir_pin; |
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struct ceph_timespec btime; |
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struct ceph_timespec snap_btime; |
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u64 change_attr; |
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}; |
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struct ceph_mds_reply_dir_entry { |
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char *name; |
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u32 name_len; |
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struct ceph_mds_reply_lease *lease; |
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struct ceph_mds_reply_info_in inode; |
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loff_t offset; |
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}; |
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/* |
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* parsed info about an mds reply, including information about |
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* either: 1) the target inode and/or its parent directory and dentry, |
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* and directory contents (for readdir results), or |
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* 2) the file range lock info (for fcntl F_GETLK results). |
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*/ |
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struct ceph_mds_reply_info_parsed { |
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struct ceph_mds_reply_head *head; |
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/* trace */ |
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struct ceph_mds_reply_info_in diri, targeti; |
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struct ceph_mds_reply_dirfrag *dirfrag; |
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char *dname; |
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u32 dname_len; |
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struct ceph_mds_reply_lease *dlease; |
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/* extra */ |
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union { |
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/* for fcntl F_GETLK results */ |
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struct ceph_filelock *filelock_reply; |
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/* for readdir results */ |
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struct { |
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struct ceph_mds_reply_dirfrag *dir_dir; |
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size_t dir_buf_size; |
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int dir_nr; |
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bool dir_end; |
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bool dir_complete; |
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bool hash_order; |
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bool offset_hash; |
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struct ceph_mds_reply_dir_entry *dir_entries; |
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}; |
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/* for create results */ |
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struct { |
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bool has_create_ino; |
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u64 ino; |
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}; |
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}; |
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/* encoded blob describing snapshot contexts for certain |
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operations (e.g., open) */ |
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void *snapblob; |
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int snapblob_len; |
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}; |
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/* |
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* cap releases are batched and sent to the MDS en masse. |
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* |
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* Account for per-message overhead of mds_cap_release header |
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* and __le32 for osd epoch barrier trailing field. |
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*/ |
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#define CEPH_CAPS_PER_RELEASE ((PAGE_SIZE - sizeof(u32) - \ |
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sizeof(struct ceph_mds_cap_release)) / \ |
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sizeof(struct ceph_mds_cap_item)) |
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/* |
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* state associated with each MDS<->client session |
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*/ |
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enum { |
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CEPH_MDS_SESSION_NEW = 1, |
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CEPH_MDS_SESSION_OPENING = 2, |
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CEPH_MDS_SESSION_OPEN = 3, |
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CEPH_MDS_SESSION_HUNG = 4, |
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CEPH_MDS_SESSION_RESTARTING = 5, |
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CEPH_MDS_SESSION_RECONNECTING = 6, |
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CEPH_MDS_SESSION_CLOSING = 7, |
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CEPH_MDS_SESSION_CLOSED = 8, |
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CEPH_MDS_SESSION_REJECTED = 9, |
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}; |
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struct ceph_mds_session { |
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struct ceph_mds_client *s_mdsc; |
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int s_mds; |
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int s_state; |
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unsigned long s_ttl; /* time until mds kills us */ |
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unsigned long s_features; |
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u64 s_seq; /* incoming msg seq # */ |
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struct mutex s_mutex; /* serialize session messages */ |
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struct ceph_connection s_con; |
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struct ceph_auth_handshake s_auth; |
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/* protected by s_gen_ttl_lock */ |
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spinlock_t s_gen_ttl_lock; |
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u32 s_cap_gen; /* inc each time we get mds stale msg */ |
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unsigned long s_cap_ttl; /* when session caps expire */ |
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/* protected by s_cap_lock */ |
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spinlock_t s_cap_lock; |
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refcount_t s_ref; |
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struct list_head s_caps; /* all caps issued by this session */ |
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struct ceph_cap *s_cap_iterator; |
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int s_nr_caps; |
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int s_num_cap_releases; |
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int s_cap_reconnect; |
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int s_readonly; |
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struct list_head s_cap_releases; /* waiting cap_release messages */ |
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struct work_struct s_cap_release_work; |
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/* See ceph_inode_info->i_dirty_item. */ |
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struct list_head s_cap_dirty; /* inodes w/ dirty caps */ |
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/* See ceph_inode_info->i_flushing_item. */ |
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struct list_head s_cap_flushing; /* inodes w/ flushing caps */ |
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unsigned long s_renew_requested; /* last time we sent a renew req */ |
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u64 s_renew_seq; |
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struct list_head s_waiting; /* waiting requests */ |
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struct list_head s_unsafe; /* unsafe requests */ |
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struct xarray s_delegated_inos; |
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}; |
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/* |
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* modes of choosing which MDS to send a request to |
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*/ |
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enum { |
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USE_ANY_MDS, |
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USE_RANDOM_MDS, |
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USE_AUTH_MDS, /* prefer authoritative mds for this metadata item */ |
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}; |
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struct ceph_mds_request; |
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struct ceph_mds_client; |
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/* |
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* request completion callback |
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*/ |
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typedef void (*ceph_mds_request_callback_t) (struct ceph_mds_client *mdsc, |
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struct ceph_mds_request *req); |
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/* |
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* wait for request completion callback |
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*/ |
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typedef int (*ceph_mds_request_wait_callback_t) (struct ceph_mds_client *mdsc, |
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struct ceph_mds_request *req); |
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/* |
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* an in-flight mds request |
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*/ |
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struct ceph_mds_request { |
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u64 r_tid; /* transaction id */ |
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struct rb_node r_node; |
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struct ceph_mds_client *r_mdsc; |
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struct kref r_kref; |
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int r_op; /* mds op code */ |
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/* operation on what? */ |
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struct inode *r_inode; /* arg1 */ |
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struct dentry *r_dentry; /* arg1 */ |
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struct dentry *r_old_dentry; /* arg2: rename from or link from */ |
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struct inode *r_old_dentry_dir; /* arg2: old dentry's parent dir */ |
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char *r_path1, *r_path2; |
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struct ceph_vino r_ino1, r_ino2; |
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struct inode *r_parent; /* parent dir inode */ |
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struct inode *r_target_inode; /* resulting inode */ |
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#define CEPH_MDS_R_DIRECT_IS_HASH (1) /* r_direct_hash is valid */ |
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#define CEPH_MDS_R_ABORTED (2) /* call was aborted */ |
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#define CEPH_MDS_R_GOT_UNSAFE (3) /* got an unsafe reply */ |
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#define CEPH_MDS_R_GOT_SAFE (4) /* got a safe reply */ |
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#define CEPH_MDS_R_GOT_RESULT (5) /* got a result */ |
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#define CEPH_MDS_R_DID_PREPOPULATE (6) /* prepopulated readdir */ |
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#define CEPH_MDS_R_PARENT_LOCKED (7) /* is r_parent->i_rwsem wlocked? */ |
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#define CEPH_MDS_R_ASYNC (8) /* async request */ |
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unsigned long r_req_flags; |
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struct mutex r_fill_mutex; |
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union ceph_mds_request_args r_args; |
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int r_fmode; /* file mode, if expecting cap */ |
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const struct cred *r_cred; |
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int r_request_release_offset; |
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struct timespec64 r_stamp; |
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/* for choosing which mds to send this request to */ |
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int r_direct_mode; |
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u32 r_direct_hash; /* choose dir frag based on this dentry hash */ |
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/* data payload is used for xattr ops */ |
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struct ceph_pagelist *r_pagelist; |
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/* what caps shall we drop? */ |
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int r_inode_drop, r_inode_unless; |
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int r_dentry_drop, r_dentry_unless; |
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int r_old_dentry_drop, r_old_dentry_unless; |
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struct inode *r_old_inode; |
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int r_old_inode_drop, r_old_inode_unless; |
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struct ceph_msg *r_request; /* original request */ |
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struct ceph_msg *r_reply; |
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struct ceph_mds_reply_info_parsed r_reply_info; |
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int r_err; |
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struct page *r_locked_page; |
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int r_dir_caps; |
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int r_num_caps; |
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u32 r_readdir_offset; |
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unsigned long r_timeout; /* optional. jiffies, 0 is "wait forever" */ |
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unsigned long r_started; /* start time to measure timeout against */ |
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unsigned long r_start_latency; /* start time to measure latency */ |
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unsigned long r_end_latency; /* finish time to measure latency */ |
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unsigned long r_request_started; /* start time for mds request only, |
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used to measure lease durations */ |
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/* link unsafe requests to parent directory, for fsync */ |
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struct inode *r_unsafe_dir; |
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struct list_head r_unsafe_dir_item; |
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/* unsafe requests that modify the target inode */ |
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struct list_head r_unsafe_target_item; |
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struct ceph_mds_session *r_session; |
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int r_attempts; /* resend attempts */ |
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int r_num_fwd; /* number of forward attempts */ |
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int r_resend_mds; /* mds to resend to next, if any*/ |
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u32 r_sent_on_mseq; /* cap mseq request was sent at*/ |
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u64 r_deleg_ino; |
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struct list_head r_wait; |
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struct completion r_completion; |
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struct completion r_safe_completion; |
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ceph_mds_request_callback_t r_callback; |
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ceph_mds_request_wait_callback_t r_wait_for_completion; |
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struct list_head r_unsafe_item; /* per-session unsafe list item */ |
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long long r_dir_release_cnt; |
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long long r_dir_ordered_cnt; |
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int r_readdir_cache_idx; |
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struct ceph_cap_reservation r_caps_reservation; |
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}; |
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struct ceph_pool_perm { |
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struct rb_node node; |
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int perm; |
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s64 pool; |
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size_t pool_ns_len; |
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char pool_ns[]; |
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}; |
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struct ceph_snapid_map { |
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struct rb_node node; |
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struct list_head lru; |
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atomic_t ref; |
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u64 snap; |
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dev_t dev; |
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unsigned long last_used; |
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}; |
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/* |
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* node for list of quotarealm inodes that are not visible from the filesystem |
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* mountpoint, but required to handle, e.g. quotas. |
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*/ |
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struct ceph_quotarealm_inode { |
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struct rb_node node; |
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u64 ino; |
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unsigned long timeout; /* last time a lookup failed for this inode */ |
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struct mutex mutex; |
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struct inode *inode; |
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}; |
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struct cap_wait { |
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struct list_head list; |
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u64 ino; |
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pid_t tgid; |
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int need; |
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int want; |
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}; |
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/* |
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* mds client state |
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*/ |
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struct ceph_mds_client { |
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struct ceph_fs_client *fsc; |
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struct mutex mutex; /* all nested structures */ |
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struct ceph_mdsmap *mdsmap; |
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struct completion safe_umount_waiters; |
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wait_queue_head_t session_close_wq; |
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struct list_head waiting_for_map; |
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int mdsmap_err; |
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struct ceph_mds_session **sessions; /* NULL for mds if no session */ |
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atomic_t num_sessions; |
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int max_sessions; /* len of sessions array */ |
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int stopping; /* true if shutting down */ |
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atomic64_t quotarealms_count; /* # realms with quota */ |
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/* |
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* We keep a list of inodes we don't see in the mountpoint but that we |
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* need to track quota realms. |
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*/ |
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struct rb_root quotarealms_inodes; |
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struct mutex quotarealms_inodes_mutex; |
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/* |
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* snap_rwsem will cover cap linkage into snaprealms, and |
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* realm snap contexts. (later, we can do per-realm snap |
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* contexts locks..) the empty list contains realms with no |
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* references (implying they contain no inodes with caps) that |
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* should be destroyed. |
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*/ |
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u64 last_snap_seq; |
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struct rw_semaphore snap_rwsem; |
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struct rb_root snap_realms; |
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struct list_head snap_empty; |
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int num_snap_realms; |
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spinlock_t snap_empty_lock; /* protect snap_empty */ |
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u64 last_tid; /* most recent mds request */ |
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u64 oldest_tid; /* oldest incomplete mds request, |
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excluding setfilelock requests */ |
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struct rb_root request_tree; /* pending mds requests */ |
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struct delayed_work delayed_work; /* delayed work */ |
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unsigned long last_renew_caps; /* last time we renewed our caps */ |
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struct list_head cap_delay_list; /* caps with delayed release */ |
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spinlock_t cap_delay_lock; /* protects cap_delay_list */ |
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struct list_head snap_flush_list; /* cap_snaps ready to flush */ |
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spinlock_t snap_flush_lock; |
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u64 last_cap_flush_tid; |
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struct list_head cap_flush_list; |
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struct list_head cap_dirty_migrating; /* ...that are migration... */ |
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int num_cap_flushing; /* # caps we are flushing */ |
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spinlock_t cap_dirty_lock; /* protects above items */ |
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wait_queue_head_t cap_flushing_wq; |
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struct work_struct cap_reclaim_work; |
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atomic_t cap_reclaim_pending; |
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/* |
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* Cap reservations |
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* |
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* Maintain a global pool of preallocated struct ceph_caps, referenced |
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* by struct ceph_caps_reservations. This ensures that we preallocate |
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* memory needed to successfully process an MDS response. (If an MDS |
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* sends us cap information and we fail to process it, we will have |
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* problems due to the client and MDS being out of sync.) |
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* |
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* Reservations are 'owned' by a ceph_cap_reservation context. |
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*/ |
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spinlock_t caps_list_lock; |
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struct list_head caps_list; /* unused (reserved or |
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unreserved) */ |
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struct list_head cap_wait_list; |
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int caps_total_count; /* total caps allocated */ |
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int caps_use_count; /* in use */ |
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int caps_use_max; /* max used caps */ |
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int caps_reserve_count; /* unused, reserved */ |
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int caps_avail_count; /* unused, unreserved */ |
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int caps_min_count; /* keep at least this many |
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(unreserved) */ |
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spinlock_t dentry_list_lock; |
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struct list_head dentry_leases; /* fifo list */ |
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struct list_head dentry_dir_leases; /* lru list */ |
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struct ceph_client_metric metric; |
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spinlock_t snapid_map_lock; |
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struct rb_root snapid_map_tree; |
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struct list_head snapid_map_lru; |
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struct rw_semaphore pool_perm_rwsem; |
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struct rb_root pool_perm_tree; |
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char nodename[__NEW_UTS_LEN + 1]; |
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}; |
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extern const char *ceph_mds_op_name(int op); |
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extern bool check_session_state(struct ceph_mds_session *s); |
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void inc_session_sequence(struct ceph_mds_session *s); |
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|
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extern struct ceph_mds_session * |
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__ceph_lookup_mds_session(struct ceph_mds_client *, int mds); |
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extern const char *ceph_session_state_name(int s); |
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|
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extern struct ceph_mds_session * |
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ceph_get_mds_session(struct ceph_mds_session *s); |
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extern void ceph_put_mds_session(struct ceph_mds_session *s); |
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extern int ceph_send_msg_mds(struct ceph_mds_client *mdsc, |
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struct ceph_msg *msg, int mds); |
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extern int ceph_mdsc_init(struct ceph_fs_client *fsc); |
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extern void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc); |
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extern void ceph_mdsc_force_umount(struct ceph_mds_client *mdsc); |
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extern void ceph_mdsc_destroy(struct ceph_fs_client *fsc); |
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extern void ceph_mdsc_sync(struct ceph_mds_client *mdsc); |
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extern void ceph_invalidate_dir_request(struct ceph_mds_request *req); |
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extern int ceph_alloc_readdir_reply_buffer(struct ceph_mds_request *req, |
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struct inode *dir); |
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extern struct ceph_mds_request * |
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ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode); |
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extern int ceph_mdsc_submit_request(struct ceph_mds_client *mdsc, |
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struct inode *dir, |
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struct ceph_mds_request *req); |
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extern int ceph_mdsc_do_request(struct ceph_mds_client *mdsc, |
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struct inode *dir, |
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struct ceph_mds_request *req); |
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extern void ceph_mdsc_release_dir_caps(struct ceph_mds_request *req); |
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extern void ceph_mdsc_release_dir_caps_no_check(struct ceph_mds_request *req); |
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static inline void ceph_mdsc_get_request(struct ceph_mds_request *req) |
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{ |
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kref_get(&req->r_kref); |
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} |
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extern void ceph_mdsc_release_request(struct kref *kref); |
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static inline void ceph_mdsc_put_request(struct ceph_mds_request *req) |
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{ |
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kref_put(&req->r_kref, ceph_mdsc_release_request); |
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} |
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|
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extern void __ceph_queue_cap_release(struct ceph_mds_session *session, |
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struct ceph_cap *cap); |
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extern void ceph_flush_cap_releases(struct ceph_mds_client *mdsc, |
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struct ceph_mds_session *session); |
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extern void ceph_queue_cap_reclaim_work(struct ceph_mds_client *mdsc); |
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extern void ceph_reclaim_caps_nr(struct ceph_mds_client *mdsc, int nr); |
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extern int ceph_iterate_session_caps(struct ceph_mds_session *session, |
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int (*cb)(struct inode *, |
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struct ceph_cap *, void *), |
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void *arg); |
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extern void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc); |
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static inline void ceph_mdsc_free_path(char *path, int len) |
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{ |
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if (!IS_ERR_OR_NULL(path)) |
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__putname(path - (PATH_MAX - 1 - len)); |
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} |
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extern char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *base, |
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int stop_on_nosnap); |
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extern void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry); |
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extern void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session, |
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struct dentry *dentry, char action, |
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u32 seq); |
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extern void ceph_mdsc_handle_mdsmap(struct ceph_mds_client *mdsc, |
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struct ceph_msg *msg); |
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extern void ceph_mdsc_handle_fsmap(struct ceph_mds_client *mdsc, |
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struct ceph_msg *msg); |
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|
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extern struct ceph_mds_session * |
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ceph_mdsc_open_export_target_session(struct ceph_mds_client *mdsc, int target); |
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extern void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc, |
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struct ceph_mds_session *session); |
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|
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extern int ceph_trim_caps(struct ceph_mds_client *mdsc, |
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struct ceph_mds_session *session, |
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int max_caps); |
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|
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static inline int ceph_wait_on_async_create(struct inode *inode) |
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{ |
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struct ceph_inode_info *ci = ceph_inode(inode); |
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|
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return wait_on_bit(&ci->i_ceph_flags, CEPH_ASYNC_CREATE_BIT, |
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TASK_INTERRUPTIBLE); |
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} |
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|
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extern u64 ceph_get_deleg_ino(struct ceph_mds_session *session); |
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extern int ceph_restore_deleg_ino(struct ceph_mds_session *session, u64 ino); |
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#endif
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