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1976 lines
51 KiB
1976 lines
51 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/spinlock.h> |
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#include <linux/namei.h> |
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#include <linux/slab.h> |
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#include <linux/sched.h> |
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#include <linux/xattr.h> |
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|
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#include "super.h" |
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#include "mds_client.h" |
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|
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/* |
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* Directory operations: readdir, lookup, create, link, unlink, |
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* rename, etc. |
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*/ |
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|
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/* |
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* Ceph MDS operations are specified in terms of a base ino and |
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* relative path. Thus, the client can specify an operation on a |
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* specific inode (e.g., a getattr due to fstat(2)), or as a path |
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* relative to, say, the root directory. |
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* |
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* Normally, we limit ourselves to strict inode ops (no path component) |
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* or dentry operations (a single path component relative to an ino). The |
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* exception to this is open_root_dentry(), which will open the mount |
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* point by name. |
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*/ |
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const struct dentry_operations ceph_dentry_ops; |
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static bool __dentry_lease_is_valid(struct ceph_dentry_info *di); |
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static int __dir_lease_try_check(const struct dentry *dentry); |
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|
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/* |
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* Initialize ceph dentry state. |
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*/ |
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static int ceph_d_init(struct dentry *dentry) |
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{ |
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struct ceph_dentry_info *di; |
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struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dentry->d_sb); |
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di = kmem_cache_zalloc(ceph_dentry_cachep, GFP_KERNEL); |
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if (!di) |
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return -ENOMEM; /* oh well */ |
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di->dentry = dentry; |
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di->lease_session = NULL; |
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di->time = jiffies; |
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dentry->d_fsdata = di; |
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INIT_LIST_HEAD(&di->lease_list); |
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atomic64_inc(&mdsc->metric.total_dentries); |
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return 0; |
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} |
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/* |
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* for f_pos for readdir: |
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* - hash order: |
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* (0xff << 52) | ((24 bits hash) << 28) | |
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* (the nth entry has hash collision); |
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* - frag+name order; |
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* ((frag value) << 28) | (the nth entry in frag); |
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*/ |
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#define OFFSET_BITS 28 |
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#define OFFSET_MASK ((1 << OFFSET_BITS) - 1) |
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#define HASH_ORDER (0xffull << (OFFSET_BITS + 24)) |
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loff_t ceph_make_fpos(unsigned high, unsigned off, bool hash_order) |
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{ |
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loff_t fpos = ((loff_t)high << 28) | (loff_t)off; |
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if (hash_order) |
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fpos |= HASH_ORDER; |
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return fpos; |
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} |
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|
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static bool is_hash_order(loff_t p) |
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{ |
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return (p & HASH_ORDER) == HASH_ORDER; |
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} |
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static unsigned fpos_frag(loff_t p) |
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{ |
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return p >> OFFSET_BITS; |
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} |
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static unsigned fpos_hash(loff_t p) |
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{ |
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return ceph_frag_value(fpos_frag(p)); |
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} |
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static unsigned fpos_off(loff_t p) |
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{ |
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return p & OFFSET_MASK; |
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} |
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static int fpos_cmp(loff_t l, loff_t r) |
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{ |
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int v = ceph_frag_compare(fpos_frag(l), fpos_frag(r)); |
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if (v) |
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return v; |
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return (int)(fpos_off(l) - fpos_off(r)); |
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} |
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/* |
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* make note of the last dentry we read, so we can |
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* continue at the same lexicographical point, |
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* regardless of what dir changes take place on the |
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* server. |
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*/ |
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static int note_last_dentry(struct ceph_dir_file_info *dfi, const char *name, |
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int len, unsigned next_offset) |
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{ |
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char *buf = kmalloc(len+1, GFP_KERNEL); |
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if (!buf) |
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return -ENOMEM; |
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kfree(dfi->last_name); |
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dfi->last_name = buf; |
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memcpy(dfi->last_name, name, len); |
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dfi->last_name[len] = 0; |
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dfi->next_offset = next_offset; |
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dout("note_last_dentry '%s'\n", dfi->last_name); |
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return 0; |
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} |
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static struct dentry * |
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__dcache_find_get_entry(struct dentry *parent, u64 idx, |
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struct ceph_readdir_cache_control *cache_ctl) |
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{ |
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struct inode *dir = d_inode(parent); |
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struct dentry *dentry; |
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unsigned idx_mask = (PAGE_SIZE / sizeof(struct dentry *)) - 1; |
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loff_t ptr_pos = idx * sizeof(struct dentry *); |
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pgoff_t ptr_pgoff = ptr_pos >> PAGE_SHIFT; |
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if (ptr_pos >= i_size_read(dir)) |
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return NULL; |
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if (!cache_ctl->page || ptr_pgoff != page_index(cache_ctl->page)) { |
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ceph_readdir_cache_release(cache_ctl); |
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cache_ctl->page = find_lock_page(&dir->i_data, ptr_pgoff); |
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if (!cache_ctl->page) { |
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dout(" page %lu not found\n", ptr_pgoff); |
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return ERR_PTR(-EAGAIN); |
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} |
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/* reading/filling the cache are serialized by |
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i_mutex, no need to use page lock */ |
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unlock_page(cache_ctl->page); |
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cache_ctl->dentries = kmap(cache_ctl->page); |
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} |
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cache_ctl->index = idx & idx_mask; |
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rcu_read_lock(); |
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spin_lock(&parent->d_lock); |
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/* check i_size again here, because empty directory can be |
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* marked as complete while not holding the i_mutex. */ |
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if (ceph_dir_is_complete_ordered(dir) && ptr_pos < i_size_read(dir)) |
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dentry = cache_ctl->dentries[cache_ctl->index]; |
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else |
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dentry = NULL; |
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spin_unlock(&parent->d_lock); |
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if (dentry && !lockref_get_not_dead(&dentry->d_lockref)) |
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dentry = NULL; |
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rcu_read_unlock(); |
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return dentry ? : ERR_PTR(-EAGAIN); |
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} |
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/* |
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* When possible, we try to satisfy a readdir by peeking at the |
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* dcache. We make this work by carefully ordering dentries on |
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* d_child when we initially get results back from the MDS, and |
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* falling back to a "normal" sync readdir if any dentries in the dir |
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* are dropped. |
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* |
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* Complete dir indicates that we have all dentries in the dir. It is |
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* defined IFF we hold CEPH_CAP_FILE_SHARED (which will be revoked by |
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* the MDS if/when the directory is modified). |
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*/ |
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static int __dcache_readdir(struct file *file, struct dir_context *ctx, |
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int shared_gen) |
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{ |
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struct ceph_dir_file_info *dfi = file->private_data; |
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struct dentry *parent = file->f_path.dentry; |
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struct inode *dir = d_inode(parent); |
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struct dentry *dentry, *last = NULL; |
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struct ceph_dentry_info *di; |
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struct ceph_readdir_cache_control cache_ctl = {}; |
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u64 idx = 0; |
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int err = 0; |
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dout("__dcache_readdir %p v%u at %llx\n", dir, (unsigned)shared_gen, ctx->pos); |
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/* search start position */ |
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if (ctx->pos > 2) { |
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u64 count = div_u64(i_size_read(dir), sizeof(struct dentry *)); |
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while (count > 0) { |
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u64 step = count >> 1; |
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dentry = __dcache_find_get_entry(parent, idx + step, |
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&cache_ctl); |
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if (!dentry) { |
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/* use linar search */ |
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idx = 0; |
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break; |
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} |
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if (IS_ERR(dentry)) { |
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err = PTR_ERR(dentry); |
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goto out; |
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} |
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di = ceph_dentry(dentry); |
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spin_lock(&dentry->d_lock); |
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if (fpos_cmp(di->offset, ctx->pos) < 0) { |
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idx += step + 1; |
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count -= step + 1; |
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} else { |
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count = step; |
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} |
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spin_unlock(&dentry->d_lock); |
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dput(dentry); |
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} |
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dout("__dcache_readdir %p cache idx %llu\n", dir, idx); |
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} |
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for (;;) { |
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bool emit_dentry = false; |
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dentry = __dcache_find_get_entry(parent, idx++, &cache_ctl); |
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if (!dentry) { |
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dfi->file_info.flags |= CEPH_F_ATEND; |
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err = 0; |
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break; |
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} |
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if (IS_ERR(dentry)) { |
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err = PTR_ERR(dentry); |
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goto out; |
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} |
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spin_lock(&dentry->d_lock); |
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di = ceph_dentry(dentry); |
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if (d_unhashed(dentry) || |
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d_really_is_negative(dentry) || |
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di->lease_shared_gen != shared_gen) { |
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spin_unlock(&dentry->d_lock); |
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dput(dentry); |
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err = -EAGAIN; |
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goto out; |
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} |
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if (fpos_cmp(ctx->pos, di->offset) <= 0) { |
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__ceph_dentry_dir_lease_touch(di); |
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emit_dentry = true; |
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} |
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spin_unlock(&dentry->d_lock); |
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if (emit_dentry) { |
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dout(" %llx dentry %p %pd %p\n", di->offset, |
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dentry, dentry, d_inode(dentry)); |
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ctx->pos = di->offset; |
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if (!dir_emit(ctx, dentry->d_name.name, |
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dentry->d_name.len, ceph_present_inode(d_inode(dentry)), |
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d_inode(dentry)->i_mode >> 12)) { |
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dput(dentry); |
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err = 0; |
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break; |
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} |
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ctx->pos++; |
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if (last) |
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dput(last); |
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last = dentry; |
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} else { |
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dput(dentry); |
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} |
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} |
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out: |
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ceph_readdir_cache_release(&cache_ctl); |
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if (last) { |
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int ret; |
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di = ceph_dentry(last); |
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ret = note_last_dentry(dfi, last->d_name.name, last->d_name.len, |
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fpos_off(di->offset) + 1); |
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if (ret < 0) |
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err = ret; |
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dput(last); |
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/* last_name no longer match cache index */ |
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if (dfi->readdir_cache_idx >= 0) { |
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dfi->readdir_cache_idx = -1; |
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dfi->dir_release_count = 0; |
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} |
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} |
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return err; |
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} |
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static bool need_send_readdir(struct ceph_dir_file_info *dfi, loff_t pos) |
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{ |
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if (!dfi->last_readdir) |
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return true; |
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if (is_hash_order(pos)) |
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return !ceph_frag_contains_value(dfi->frag, fpos_hash(pos)); |
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else |
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return dfi->frag != fpos_frag(pos); |
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} |
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static int ceph_readdir(struct file *file, struct dir_context *ctx) |
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{ |
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struct ceph_dir_file_info *dfi = file->private_data; |
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struct inode *inode = file_inode(file); |
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struct ceph_inode_info *ci = ceph_inode(inode); |
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struct ceph_fs_client *fsc = ceph_inode_to_client(inode); |
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struct ceph_mds_client *mdsc = fsc->mdsc; |
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int i; |
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int err; |
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unsigned frag = -1; |
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struct ceph_mds_reply_info_parsed *rinfo; |
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dout("readdir %p file %p pos %llx\n", inode, file, ctx->pos); |
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if (dfi->file_info.flags & CEPH_F_ATEND) |
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return 0; |
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/* always start with . and .. */ |
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if (ctx->pos == 0) { |
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dout("readdir off 0 -> '.'\n"); |
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if (!dir_emit(ctx, ".", 1, ceph_present_inode(inode), |
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inode->i_mode >> 12)) |
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return 0; |
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ctx->pos = 1; |
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} |
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if (ctx->pos == 1) { |
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u64 ino; |
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struct dentry *dentry = file->f_path.dentry; |
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spin_lock(&dentry->d_lock); |
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ino = ceph_present_inode(dentry->d_parent->d_inode); |
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spin_unlock(&dentry->d_lock); |
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dout("readdir off 1 -> '..'\n"); |
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if (!dir_emit(ctx, "..", 2, ino, inode->i_mode >> 12)) |
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return 0; |
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ctx->pos = 2; |
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} |
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spin_lock(&ci->i_ceph_lock); |
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/* request Fx cap. if have Fx, we don't need to release Fs cap |
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* for later create/unlink. */ |
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__ceph_touch_fmode(ci, mdsc, CEPH_FILE_MODE_WR); |
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/* can we use the dcache? */ |
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if (ceph_test_mount_opt(fsc, DCACHE) && |
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!ceph_test_mount_opt(fsc, NOASYNCREADDIR) && |
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ceph_snap(inode) != CEPH_SNAPDIR && |
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__ceph_dir_is_complete_ordered(ci) && |
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__ceph_caps_issued_mask_metric(ci, CEPH_CAP_FILE_SHARED, 1)) { |
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int shared_gen = atomic_read(&ci->i_shared_gen); |
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spin_unlock(&ci->i_ceph_lock); |
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err = __dcache_readdir(file, ctx, shared_gen); |
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if (err != -EAGAIN) |
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return err; |
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} else { |
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spin_unlock(&ci->i_ceph_lock); |
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} |
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|
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/* proceed with a normal readdir */ |
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more: |
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/* do we have the correct frag content buffered? */ |
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if (need_send_readdir(dfi, ctx->pos)) { |
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struct ceph_mds_request *req; |
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int op = ceph_snap(inode) == CEPH_SNAPDIR ? |
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CEPH_MDS_OP_LSSNAP : CEPH_MDS_OP_READDIR; |
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|
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/* discard old result, if any */ |
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if (dfi->last_readdir) { |
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ceph_mdsc_put_request(dfi->last_readdir); |
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dfi->last_readdir = NULL; |
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} |
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if (is_hash_order(ctx->pos)) { |
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/* fragtree isn't always accurate. choose frag |
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* based on previous reply when possible. */ |
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if (frag == (unsigned)-1) |
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frag = ceph_choose_frag(ci, fpos_hash(ctx->pos), |
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NULL, NULL); |
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} else { |
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frag = fpos_frag(ctx->pos); |
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} |
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dout("readdir fetching %llx.%llx frag %x offset '%s'\n", |
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ceph_vinop(inode), frag, dfi->last_name); |
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req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); |
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if (IS_ERR(req)) |
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return PTR_ERR(req); |
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err = ceph_alloc_readdir_reply_buffer(req, inode); |
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if (err) { |
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ceph_mdsc_put_request(req); |
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return err; |
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} |
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/* hints to request -> mds selection code */ |
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req->r_direct_mode = USE_AUTH_MDS; |
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if (op == CEPH_MDS_OP_READDIR) { |
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req->r_direct_hash = ceph_frag_value(frag); |
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__set_bit(CEPH_MDS_R_DIRECT_IS_HASH, &req->r_req_flags); |
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req->r_inode_drop = CEPH_CAP_FILE_EXCL; |
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} |
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if (dfi->last_name) { |
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req->r_path2 = kstrdup(dfi->last_name, GFP_KERNEL); |
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if (!req->r_path2) { |
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ceph_mdsc_put_request(req); |
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return -ENOMEM; |
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} |
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} else if (is_hash_order(ctx->pos)) { |
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req->r_args.readdir.offset_hash = |
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cpu_to_le32(fpos_hash(ctx->pos)); |
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} |
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req->r_dir_release_cnt = dfi->dir_release_count; |
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req->r_dir_ordered_cnt = dfi->dir_ordered_count; |
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req->r_readdir_cache_idx = dfi->readdir_cache_idx; |
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req->r_readdir_offset = dfi->next_offset; |
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req->r_args.readdir.frag = cpu_to_le32(frag); |
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req->r_args.readdir.flags = |
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cpu_to_le16(CEPH_READDIR_REPLY_BITFLAGS); |
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req->r_inode = inode; |
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ihold(inode); |
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req->r_dentry = dget(file->f_path.dentry); |
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err = ceph_mdsc_do_request(mdsc, NULL, req); |
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if (err < 0) { |
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ceph_mdsc_put_request(req); |
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return err; |
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} |
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dout("readdir got and parsed readdir result=%d on " |
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"frag %x, end=%d, complete=%d, hash_order=%d\n", |
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err, frag, |
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(int)req->r_reply_info.dir_end, |
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(int)req->r_reply_info.dir_complete, |
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(int)req->r_reply_info.hash_order); |
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rinfo = &req->r_reply_info; |
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if (le32_to_cpu(rinfo->dir_dir->frag) != frag) { |
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frag = le32_to_cpu(rinfo->dir_dir->frag); |
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if (!rinfo->hash_order) { |
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dfi->next_offset = req->r_readdir_offset; |
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/* adjust ctx->pos to beginning of frag */ |
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ctx->pos = ceph_make_fpos(frag, |
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dfi->next_offset, |
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false); |
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} |
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} |
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|
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dfi->frag = frag; |
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dfi->last_readdir = req; |
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|
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if (test_bit(CEPH_MDS_R_DID_PREPOPULATE, &req->r_req_flags)) { |
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dfi->readdir_cache_idx = req->r_readdir_cache_idx; |
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if (dfi->readdir_cache_idx < 0) { |
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/* preclude from marking dir ordered */ |
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dfi->dir_ordered_count = 0; |
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} else if (ceph_frag_is_leftmost(frag) && |
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dfi->next_offset == 2) { |
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/* note dir version at start of readdir so |
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* we can tell if any dentries get dropped */ |
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dfi->dir_release_count = req->r_dir_release_cnt; |
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dfi->dir_ordered_count = req->r_dir_ordered_cnt; |
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} |
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} else { |
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dout("readdir !did_prepopulate\n"); |
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/* disable readdir cache */ |
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dfi->readdir_cache_idx = -1; |
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/* preclude from marking dir complete */ |
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dfi->dir_release_count = 0; |
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} |
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|
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/* note next offset and last dentry name */ |
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if (rinfo->dir_nr > 0) { |
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struct ceph_mds_reply_dir_entry *rde = |
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rinfo->dir_entries + (rinfo->dir_nr-1); |
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unsigned next_offset = req->r_reply_info.dir_end ? |
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2 : (fpos_off(rde->offset) + 1); |
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err = note_last_dentry(dfi, rde->name, rde->name_len, |
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next_offset); |
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if (err) |
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return err; |
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} else if (req->r_reply_info.dir_end) { |
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dfi->next_offset = 2; |
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/* keep last name */ |
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} |
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} |
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|
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rinfo = &dfi->last_readdir->r_reply_info; |
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dout("readdir frag %x num %d pos %llx chunk first %llx\n", |
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dfi->frag, rinfo->dir_nr, ctx->pos, |
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rinfo->dir_nr ? rinfo->dir_entries[0].offset : 0LL); |
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|
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i = 0; |
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/* search start position */ |
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if (rinfo->dir_nr > 0) { |
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int step, nr = rinfo->dir_nr; |
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while (nr > 0) { |
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step = nr >> 1; |
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if (rinfo->dir_entries[i + step].offset < ctx->pos) { |
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i += step + 1; |
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nr -= step + 1; |
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} else { |
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nr = step; |
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} |
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} |
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} |
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for (; i < rinfo->dir_nr; i++) { |
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struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i; |
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|
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BUG_ON(rde->offset < ctx->pos); |
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|
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ctx->pos = rde->offset; |
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dout("readdir (%d/%d) -> %llx '%.*s' %p\n", |
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i, rinfo->dir_nr, ctx->pos, |
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rde->name_len, rde->name, &rde->inode.in); |
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|
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BUG_ON(!rde->inode.in); |
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|
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if (!dir_emit(ctx, rde->name, rde->name_len, |
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ceph_present_ino(inode->i_sb, le64_to_cpu(rde->inode.in->ino)), |
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le32_to_cpu(rde->inode.in->mode) >> 12)) { |
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dout("filldir stopping us...\n"); |
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return 0; |
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} |
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ctx->pos++; |
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} |
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|
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ceph_mdsc_put_request(dfi->last_readdir); |
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dfi->last_readdir = NULL; |
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|
|
if (dfi->next_offset > 2) { |
|
frag = dfi->frag; |
|
goto more; |
|
} |
|
|
|
/* more frags? */ |
|
if (!ceph_frag_is_rightmost(dfi->frag)) { |
|
frag = ceph_frag_next(dfi->frag); |
|
if (is_hash_order(ctx->pos)) { |
|
loff_t new_pos = ceph_make_fpos(ceph_frag_value(frag), |
|
dfi->next_offset, true); |
|
if (new_pos > ctx->pos) |
|
ctx->pos = new_pos; |
|
/* keep last_name */ |
|
} else { |
|
ctx->pos = ceph_make_fpos(frag, dfi->next_offset, |
|
false); |
|
kfree(dfi->last_name); |
|
dfi->last_name = NULL; |
|
} |
|
dout("readdir next frag is %x\n", frag); |
|
goto more; |
|
} |
|
dfi->file_info.flags |= CEPH_F_ATEND; |
|
|
|
/* |
|
* if dir_release_count still matches the dir, no dentries |
|
* were released during the whole readdir, and we should have |
|
* the complete dir contents in our cache. |
|
*/ |
|
if (atomic64_read(&ci->i_release_count) == |
|
dfi->dir_release_count) { |
|
spin_lock(&ci->i_ceph_lock); |
|
if (dfi->dir_ordered_count == |
|
atomic64_read(&ci->i_ordered_count)) { |
|
dout(" marking %p complete and ordered\n", inode); |
|
/* use i_size to track number of entries in |
|
* readdir cache */ |
|
BUG_ON(dfi->readdir_cache_idx < 0); |
|
i_size_write(inode, dfi->readdir_cache_idx * |
|
sizeof(struct dentry*)); |
|
} else { |
|
dout(" marking %p complete\n", inode); |
|
} |
|
__ceph_dir_set_complete(ci, dfi->dir_release_count, |
|
dfi->dir_ordered_count); |
|
spin_unlock(&ci->i_ceph_lock); |
|
} |
|
|
|
dout("readdir %p file %p done.\n", inode, file); |
|
return 0; |
|
} |
|
|
|
static void reset_readdir(struct ceph_dir_file_info *dfi) |
|
{ |
|
if (dfi->last_readdir) { |
|
ceph_mdsc_put_request(dfi->last_readdir); |
|
dfi->last_readdir = NULL; |
|
} |
|
kfree(dfi->last_name); |
|
dfi->last_name = NULL; |
|
dfi->dir_release_count = 0; |
|
dfi->readdir_cache_idx = -1; |
|
dfi->next_offset = 2; /* compensate for . and .. */ |
|
dfi->file_info.flags &= ~CEPH_F_ATEND; |
|
} |
|
|
|
/* |
|
* discard buffered readdir content on seekdir(0), or seek to new frag, |
|
* or seek prior to current chunk |
|
*/ |
|
static bool need_reset_readdir(struct ceph_dir_file_info *dfi, loff_t new_pos) |
|
{ |
|
struct ceph_mds_reply_info_parsed *rinfo; |
|
loff_t chunk_offset; |
|
if (new_pos == 0) |
|
return true; |
|
if (is_hash_order(new_pos)) { |
|
/* no need to reset last_name for a forward seek when |
|
* dentries are sotred in hash order */ |
|
} else if (dfi->frag != fpos_frag(new_pos)) { |
|
return true; |
|
} |
|
rinfo = dfi->last_readdir ? &dfi->last_readdir->r_reply_info : NULL; |
|
if (!rinfo || !rinfo->dir_nr) |
|
return true; |
|
chunk_offset = rinfo->dir_entries[0].offset; |
|
return new_pos < chunk_offset || |
|
is_hash_order(new_pos) != is_hash_order(chunk_offset); |
|
} |
|
|
|
static loff_t ceph_dir_llseek(struct file *file, loff_t offset, int whence) |
|
{ |
|
struct ceph_dir_file_info *dfi = file->private_data; |
|
struct inode *inode = file->f_mapping->host; |
|
loff_t retval; |
|
|
|
inode_lock(inode); |
|
retval = -EINVAL; |
|
switch (whence) { |
|
case SEEK_CUR: |
|
offset += file->f_pos; |
|
case SEEK_SET: |
|
break; |
|
case SEEK_END: |
|
retval = -EOPNOTSUPP; |
|
default: |
|
goto out; |
|
} |
|
|
|
if (offset >= 0) { |
|
if (need_reset_readdir(dfi, offset)) { |
|
dout("dir_llseek dropping %p content\n", file); |
|
reset_readdir(dfi); |
|
} else if (is_hash_order(offset) && offset > file->f_pos) { |
|
/* for hash offset, we don't know if a forward seek |
|
* is within same frag */ |
|
dfi->dir_release_count = 0; |
|
dfi->readdir_cache_idx = -1; |
|
} |
|
|
|
if (offset != file->f_pos) { |
|
file->f_pos = offset; |
|
file->f_version = 0; |
|
dfi->file_info.flags &= ~CEPH_F_ATEND; |
|
} |
|
retval = offset; |
|
} |
|
out: |
|
inode_unlock(inode); |
|
return retval; |
|
} |
|
|
|
/* |
|
* Handle lookups for the hidden .snap directory. |
|
*/ |
|
int ceph_handle_snapdir(struct ceph_mds_request *req, |
|
struct dentry *dentry, int err) |
|
{ |
|
struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb); |
|
struct inode *parent = d_inode(dentry->d_parent); /* we hold i_mutex */ |
|
|
|
/* .snap dir? */ |
|
if (err == -ENOENT && |
|
ceph_snap(parent) == CEPH_NOSNAP && |
|
strcmp(dentry->d_name.name, |
|
fsc->mount_options->snapdir_name) == 0) { |
|
struct inode *inode = ceph_get_snapdir(parent); |
|
dout("ENOENT on snapdir %p '%pd', linking to snapdir %p\n", |
|
dentry, dentry, inode); |
|
BUG_ON(!d_unhashed(dentry)); |
|
d_add(dentry, inode); |
|
err = 0; |
|
} |
|
return err; |
|
} |
|
|
|
/* |
|
* Figure out final result of a lookup/open request. |
|
* |
|
* Mainly, make sure we return the final req->r_dentry (if it already |
|
* existed) in place of the original VFS-provided dentry when they |
|
* differ. |
|
* |
|
* Gracefully handle the case where the MDS replies with -ENOENT and |
|
* no trace (which it may do, at its discretion, e.g., if it doesn't |
|
* care to issue a lease on the negative dentry). |
|
*/ |
|
struct dentry *ceph_finish_lookup(struct ceph_mds_request *req, |
|
struct dentry *dentry, int err) |
|
{ |
|
if (err == -ENOENT) { |
|
/* no trace? */ |
|
err = 0; |
|
if (!req->r_reply_info.head->is_dentry) { |
|
dout("ENOENT and no trace, dentry %p inode %p\n", |
|
dentry, d_inode(dentry)); |
|
if (d_really_is_positive(dentry)) { |
|
d_drop(dentry); |
|
err = -ENOENT; |
|
} else { |
|
d_add(dentry, NULL); |
|
} |
|
} |
|
} |
|
if (err) |
|
dentry = ERR_PTR(err); |
|
else if (dentry != req->r_dentry) |
|
dentry = dget(req->r_dentry); /* we got spliced */ |
|
else |
|
dentry = NULL; |
|
return dentry; |
|
} |
|
|
|
static bool is_root_ceph_dentry(struct inode *inode, struct dentry *dentry) |
|
{ |
|
return ceph_ino(inode) == CEPH_INO_ROOT && |
|
strncmp(dentry->d_name.name, ".ceph", 5) == 0; |
|
} |
|
|
|
/* |
|
* Look up a single dir entry. If there is a lookup intent, inform |
|
* the MDS so that it gets our 'caps wanted' value in a single op. |
|
*/ |
|
static struct dentry *ceph_lookup(struct inode *dir, struct dentry *dentry, |
|
unsigned int flags) |
|
{ |
|
struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
|
struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb); |
|
struct ceph_mds_request *req; |
|
int op; |
|
int mask; |
|
int err; |
|
|
|
dout("lookup %p dentry %p '%pd'\n", |
|
dir, dentry, dentry); |
|
|
|
if (dentry->d_name.len > NAME_MAX) |
|
return ERR_PTR(-ENAMETOOLONG); |
|
|
|
/* can we conclude ENOENT locally? */ |
|
if (d_really_is_negative(dentry)) { |
|
struct ceph_inode_info *ci = ceph_inode(dir); |
|
struct ceph_dentry_info *di = ceph_dentry(dentry); |
|
|
|
spin_lock(&ci->i_ceph_lock); |
|
dout(" dir %p flags are 0x%lx\n", dir, ci->i_ceph_flags); |
|
if (strncmp(dentry->d_name.name, |
|
fsc->mount_options->snapdir_name, |
|
dentry->d_name.len) && |
|
!is_root_ceph_dentry(dir, dentry) && |
|
ceph_test_mount_opt(fsc, DCACHE) && |
|
__ceph_dir_is_complete(ci) && |
|
__ceph_caps_issued_mask_metric(ci, CEPH_CAP_FILE_SHARED, 1)) { |
|
__ceph_touch_fmode(ci, mdsc, CEPH_FILE_MODE_RD); |
|
spin_unlock(&ci->i_ceph_lock); |
|
dout(" dir %p complete, -ENOENT\n", dir); |
|
d_add(dentry, NULL); |
|
di->lease_shared_gen = atomic_read(&ci->i_shared_gen); |
|
return NULL; |
|
} |
|
spin_unlock(&ci->i_ceph_lock); |
|
} |
|
|
|
op = ceph_snap(dir) == CEPH_SNAPDIR ? |
|
CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP; |
|
req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS); |
|
if (IS_ERR(req)) |
|
return ERR_CAST(req); |
|
req->r_dentry = dget(dentry); |
|
req->r_num_caps = 2; |
|
|
|
mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED; |
|
if (ceph_security_xattr_wanted(dir)) |
|
mask |= CEPH_CAP_XATTR_SHARED; |
|
req->r_args.getattr.mask = cpu_to_le32(mask); |
|
|
|
req->r_parent = dir; |
|
set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags); |
|
err = ceph_mdsc_do_request(mdsc, NULL, req); |
|
err = ceph_handle_snapdir(req, dentry, err); |
|
dentry = ceph_finish_lookup(req, dentry, err); |
|
ceph_mdsc_put_request(req); /* will dput(dentry) */ |
|
dout("lookup result=%p\n", dentry); |
|
return dentry; |
|
} |
|
|
|
/* |
|
* If we do a create but get no trace back from the MDS, follow up with |
|
* a lookup (the VFS expects us to link up the provided dentry). |
|
*/ |
|
int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry) |
|
{ |
|
struct dentry *result = ceph_lookup(dir, dentry, 0); |
|
|
|
if (result && !IS_ERR(result)) { |
|
/* |
|
* We created the item, then did a lookup, and found |
|
* it was already linked to another inode we already |
|
* had in our cache (and thus got spliced). To not |
|
* confuse VFS (especially when inode is a directory), |
|
* we don't link our dentry to that inode, return an |
|
* error instead. |
|
* |
|
* This event should be rare and it happens only when |
|
* we talk to old MDS. Recent MDS does not send traceless |
|
* reply for request that creates new inode. |
|
*/ |
|
d_drop(result); |
|
return -ESTALE; |
|
} |
|
return PTR_ERR(result); |
|
} |
|
|
|
static int ceph_mknod(struct user_namespace *mnt_userns, struct inode *dir, |
|
struct dentry *dentry, umode_t mode, dev_t rdev) |
|
{ |
|
struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb); |
|
struct ceph_mds_request *req; |
|
struct ceph_acl_sec_ctx as_ctx = {}; |
|
int err; |
|
|
|
if (ceph_snap(dir) != CEPH_NOSNAP) |
|
return -EROFS; |
|
|
|
if (ceph_quota_is_max_files_exceeded(dir)) { |
|
err = -EDQUOT; |
|
goto out; |
|
} |
|
|
|
err = ceph_pre_init_acls(dir, &mode, &as_ctx); |
|
if (err < 0) |
|
goto out; |
|
err = ceph_security_init_secctx(dentry, mode, &as_ctx); |
|
if (err < 0) |
|
goto out; |
|
|
|
dout("mknod in dir %p dentry %p mode 0%ho rdev %d\n", |
|
dir, dentry, mode, rdev); |
|
req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_MKNOD, USE_AUTH_MDS); |
|
if (IS_ERR(req)) { |
|
err = PTR_ERR(req); |
|
goto out; |
|
} |
|
req->r_dentry = dget(dentry); |
|
req->r_num_caps = 2; |
|
req->r_parent = dir; |
|
set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags); |
|
req->r_args.mknod.mode = cpu_to_le32(mode); |
|
req->r_args.mknod.rdev = cpu_to_le32(rdev); |
|
req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_AUTH_EXCL; |
|
req->r_dentry_unless = CEPH_CAP_FILE_EXCL; |
|
if (as_ctx.pagelist) { |
|
req->r_pagelist = as_ctx.pagelist; |
|
as_ctx.pagelist = NULL; |
|
} |
|
err = ceph_mdsc_do_request(mdsc, dir, req); |
|
if (!err && !req->r_reply_info.head->is_dentry) |
|
err = ceph_handle_notrace_create(dir, dentry); |
|
ceph_mdsc_put_request(req); |
|
out: |
|
if (!err) |
|
ceph_init_inode_acls(d_inode(dentry), &as_ctx); |
|
else |
|
d_drop(dentry); |
|
ceph_release_acl_sec_ctx(&as_ctx); |
|
return err; |
|
} |
|
|
|
static int ceph_create(struct user_namespace *mnt_userns, struct inode *dir, |
|
struct dentry *dentry, umode_t mode, bool excl) |
|
{ |
|
return ceph_mknod(mnt_userns, dir, dentry, mode, 0); |
|
} |
|
|
|
static int ceph_symlink(struct user_namespace *mnt_userns, struct inode *dir, |
|
struct dentry *dentry, const char *dest) |
|
{ |
|
struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb); |
|
struct ceph_mds_request *req; |
|
struct ceph_acl_sec_ctx as_ctx = {}; |
|
int err; |
|
|
|
if (ceph_snap(dir) != CEPH_NOSNAP) |
|
return -EROFS; |
|
|
|
if (ceph_quota_is_max_files_exceeded(dir)) { |
|
err = -EDQUOT; |
|
goto out; |
|
} |
|
|
|
err = ceph_security_init_secctx(dentry, S_IFLNK | 0777, &as_ctx); |
|
if (err < 0) |
|
goto out; |
|
|
|
dout("symlink in dir %p dentry %p to '%s'\n", dir, dentry, dest); |
|
req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SYMLINK, USE_AUTH_MDS); |
|
if (IS_ERR(req)) { |
|
err = PTR_ERR(req); |
|
goto out; |
|
} |
|
req->r_path2 = kstrdup(dest, GFP_KERNEL); |
|
if (!req->r_path2) { |
|
err = -ENOMEM; |
|
ceph_mdsc_put_request(req); |
|
goto out; |
|
} |
|
req->r_parent = dir; |
|
set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags); |
|
req->r_dentry = dget(dentry); |
|
req->r_num_caps = 2; |
|
req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_AUTH_EXCL; |
|
req->r_dentry_unless = CEPH_CAP_FILE_EXCL; |
|
if (as_ctx.pagelist) { |
|
req->r_pagelist = as_ctx.pagelist; |
|
as_ctx.pagelist = NULL; |
|
} |
|
err = ceph_mdsc_do_request(mdsc, dir, req); |
|
if (!err && !req->r_reply_info.head->is_dentry) |
|
err = ceph_handle_notrace_create(dir, dentry); |
|
ceph_mdsc_put_request(req); |
|
out: |
|
if (err) |
|
d_drop(dentry); |
|
ceph_release_acl_sec_ctx(&as_ctx); |
|
return err; |
|
} |
|
|
|
static int ceph_mkdir(struct user_namespace *mnt_userns, struct inode *dir, |
|
struct dentry *dentry, umode_t mode) |
|
{ |
|
struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb); |
|
struct ceph_mds_request *req; |
|
struct ceph_acl_sec_ctx as_ctx = {}; |
|
int err = -EROFS; |
|
int op; |
|
|
|
if (ceph_snap(dir) == CEPH_SNAPDIR) { |
|
/* mkdir .snap/foo is a MKSNAP */ |
|
op = CEPH_MDS_OP_MKSNAP; |
|
dout("mksnap dir %p snap '%pd' dn %p\n", dir, |
|
dentry, dentry); |
|
} else if (ceph_snap(dir) == CEPH_NOSNAP) { |
|
dout("mkdir dir %p dn %p mode 0%ho\n", dir, dentry, mode); |
|
op = CEPH_MDS_OP_MKDIR; |
|
} else { |
|
goto out; |
|
} |
|
|
|
if (op == CEPH_MDS_OP_MKDIR && |
|
ceph_quota_is_max_files_exceeded(dir)) { |
|
err = -EDQUOT; |
|
goto out; |
|
} |
|
|
|
mode |= S_IFDIR; |
|
err = ceph_pre_init_acls(dir, &mode, &as_ctx); |
|
if (err < 0) |
|
goto out; |
|
err = ceph_security_init_secctx(dentry, mode, &as_ctx); |
|
if (err < 0) |
|
goto out; |
|
|
|
req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); |
|
if (IS_ERR(req)) { |
|
err = PTR_ERR(req); |
|
goto out; |
|
} |
|
|
|
req->r_dentry = dget(dentry); |
|
req->r_num_caps = 2; |
|
req->r_parent = dir; |
|
set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags); |
|
req->r_args.mkdir.mode = cpu_to_le32(mode); |
|
req->r_dentry_drop = CEPH_CAP_FILE_SHARED | CEPH_CAP_AUTH_EXCL; |
|
req->r_dentry_unless = CEPH_CAP_FILE_EXCL; |
|
if (as_ctx.pagelist) { |
|
req->r_pagelist = as_ctx.pagelist; |
|
as_ctx.pagelist = NULL; |
|
} |
|
err = ceph_mdsc_do_request(mdsc, dir, req); |
|
if (!err && |
|
!req->r_reply_info.head->is_target && |
|
!req->r_reply_info.head->is_dentry) |
|
err = ceph_handle_notrace_create(dir, dentry); |
|
ceph_mdsc_put_request(req); |
|
out: |
|
if (!err) |
|
ceph_init_inode_acls(d_inode(dentry), &as_ctx); |
|
else |
|
d_drop(dentry); |
|
ceph_release_acl_sec_ctx(&as_ctx); |
|
return err; |
|
} |
|
|
|
static int ceph_link(struct dentry *old_dentry, struct inode *dir, |
|
struct dentry *dentry) |
|
{ |
|
struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(dir->i_sb); |
|
struct ceph_mds_request *req; |
|
int err; |
|
|
|
if (ceph_snap(dir) != CEPH_NOSNAP) |
|
return -EROFS; |
|
|
|
dout("link in dir %p old_dentry %p dentry %p\n", dir, |
|
old_dentry, dentry); |
|
req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_LINK, USE_AUTH_MDS); |
|
if (IS_ERR(req)) { |
|
d_drop(dentry); |
|
return PTR_ERR(req); |
|
} |
|
req->r_dentry = dget(dentry); |
|
req->r_num_caps = 2; |
|
req->r_old_dentry = dget(old_dentry); |
|
req->r_parent = dir; |
|
set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags); |
|
req->r_dentry_drop = CEPH_CAP_FILE_SHARED; |
|
req->r_dentry_unless = CEPH_CAP_FILE_EXCL; |
|
/* release LINK_SHARED on source inode (mds will lock it) */ |
|
req->r_old_inode_drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL; |
|
err = ceph_mdsc_do_request(mdsc, dir, req); |
|
if (err) { |
|
d_drop(dentry); |
|
} else if (!req->r_reply_info.head->is_dentry) { |
|
ihold(d_inode(old_dentry)); |
|
d_instantiate(dentry, d_inode(old_dentry)); |
|
} |
|
ceph_mdsc_put_request(req); |
|
return err; |
|
} |
|
|
|
static void ceph_async_unlink_cb(struct ceph_mds_client *mdsc, |
|
struct ceph_mds_request *req) |
|
{ |
|
int result = req->r_err ? req->r_err : |
|
le32_to_cpu(req->r_reply_info.head->result); |
|
|
|
if (result == -EJUKEBOX) |
|
goto out; |
|
|
|
/* If op failed, mark everyone involved for errors */ |
|
if (result) { |
|
int pathlen = 0; |
|
u64 base = 0; |
|
char *path = ceph_mdsc_build_path(req->r_dentry, &pathlen, |
|
&base, 0); |
|
|
|
/* mark error on parent + clear complete */ |
|
mapping_set_error(req->r_parent->i_mapping, result); |
|
ceph_dir_clear_complete(req->r_parent); |
|
|
|
/* drop the dentry -- we don't know its status */ |
|
if (!d_unhashed(req->r_dentry)) |
|
d_drop(req->r_dentry); |
|
|
|
/* mark inode itself for an error (since metadata is bogus) */ |
|
mapping_set_error(req->r_old_inode->i_mapping, result); |
|
|
|
pr_warn("ceph: async unlink failure path=(%llx)%s result=%d!\n", |
|
base, IS_ERR(path) ? "<<bad>>" : path, result); |
|
ceph_mdsc_free_path(path, pathlen); |
|
} |
|
out: |
|
iput(req->r_old_inode); |
|
ceph_mdsc_release_dir_caps(req); |
|
} |
|
|
|
static int get_caps_for_async_unlink(struct inode *dir, struct dentry *dentry) |
|
{ |
|
struct ceph_inode_info *ci = ceph_inode(dir); |
|
struct ceph_dentry_info *di; |
|
int got = 0, want = CEPH_CAP_FILE_EXCL | CEPH_CAP_DIR_UNLINK; |
|
|
|
spin_lock(&ci->i_ceph_lock); |
|
if ((__ceph_caps_issued(ci, NULL) & want) == want) { |
|
ceph_take_cap_refs(ci, want, false); |
|
got = want; |
|
} |
|
spin_unlock(&ci->i_ceph_lock); |
|
|
|
/* If we didn't get anything, return 0 */ |
|
if (!got) |
|
return 0; |
|
|
|
spin_lock(&dentry->d_lock); |
|
di = ceph_dentry(dentry); |
|
/* |
|
* - We are holding Fx, which implies Fs caps. |
|
* - Only support async unlink for primary linkage |
|
*/ |
|
if (atomic_read(&ci->i_shared_gen) != di->lease_shared_gen || |
|
!(di->flags & CEPH_DENTRY_PRIMARY_LINK)) |
|
want = 0; |
|
spin_unlock(&dentry->d_lock); |
|
|
|
/* Do we still want what we've got? */ |
|
if (want == got) |
|
return got; |
|
|
|
ceph_put_cap_refs(ci, got); |
|
return 0; |
|
} |
|
|
|
/* |
|
* rmdir and unlink are differ only by the metadata op code |
|
*/ |
|
static int ceph_unlink(struct inode *dir, struct dentry *dentry) |
|
{ |
|
struct ceph_fs_client *fsc = ceph_sb_to_client(dir->i_sb); |
|
struct ceph_mds_client *mdsc = fsc->mdsc; |
|
struct inode *inode = d_inode(dentry); |
|
struct ceph_mds_request *req; |
|
bool try_async = ceph_test_mount_opt(fsc, ASYNC_DIROPS); |
|
int err = -EROFS; |
|
int op; |
|
|
|
if (ceph_snap(dir) == CEPH_SNAPDIR) { |
|
/* rmdir .snap/foo is RMSNAP */ |
|
dout("rmsnap dir %p '%pd' dn %p\n", dir, dentry, dentry); |
|
op = CEPH_MDS_OP_RMSNAP; |
|
} else if (ceph_snap(dir) == CEPH_NOSNAP) { |
|
dout("unlink/rmdir dir %p dn %p inode %p\n", |
|
dir, dentry, inode); |
|
op = d_is_dir(dentry) ? |
|
CEPH_MDS_OP_RMDIR : CEPH_MDS_OP_UNLINK; |
|
} else |
|
goto out; |
|
retry: |
|
req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); |
|
if (IS_ERR(req)) { |
|
err = PTR_ERR(req); |
|
goto out; |
|
} |
|
req->r_dentry = dget(dentry); |
|
req->r_num_caps = 2; |
|
req->r_parent = dir; |
|
req->r_dentry_drop = CEPH_CAP_FILE_SHARED; |
|
req->r_dentry_unless = CEPH_CAP_FILE_EXCL; |
|
req->r_inode_drop = ceph_drop_caps_for_unlink(inode); |
|
|
|
if (try_async && op == CEPH_MDS_OP_UNLINK && |
|
(req->r_dir_caps = get_caps_for_async_unlink(dir, dentry))) { |
|
dout("async unlink on %llu/%.*s caps=%s", ceph_ino(dir), |
|
dentry->d_name.len, dentry->d_name.name, |
|
ceph_cap_string(req->r_dir_caps)); |
|
set_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags); |
|
req->r_callback = ceph_async_unlink_cb; |
|
req->r_old_inode = d_inode(dentry); |
|
ihold(req->r_old_inode); |
|
err = ceph_mdsc_submit_request(mdsc, dir, req); |
|
if (!err) { |
|
/* |
|
* We have enough caps, so we assume that the unlink |
|
* will succeed. Fix up the target inode and dcache. |
|
*/ |
|
drop_nlink(inode); |
|
d_delete(dentry); |
|
} else if (err == -EJUKEBOX) { |
|
try_async = false; |
|
ceph_mdsc_put_request(req); |
|
goto retry; |
|
} |
|
} else { |
|
set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags); |
|
err = ceph_mdsc_do_request(mdsc, dir, req); |
|
if (!err && !req->r_reply_info.head->is_dentry) |
|
d_delete(dentry); |
|
} |
|
|
|
ceph_mdsc_put_request(req); |
|
out: |
|
return err; |
|
} |
|
|
|
static int ceph_rename(struct user_namespace *mnt_userns, struct inode *old_dir, |
|
struct dentry *old_dentry, struct inode *new_dir, |
|
struct dentry *new_dentry, unsigned int flags) |
|
{ |
|
struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(old_dir->i_sb); |
|
struct ceph_mds_request *req; |
|
int op = CEPH_MDS_OP_RENAME; |
|
int err; |
|
|
|
if (flags) |
|
return -EINVAL; |
|
|
|
if (ceph_snap(old_dir) != ceph_snap(new_dir)) |
|
return -EXDEV; |
|
if (ceph_snap(old_dir) != CEPH_NOSNAP) { |
|
if (old_dir == new_dir && ceph_snap(old_dir) == CEPH_SNAPDIR) |
|
op = CEPH_MDS_OP_RENAMESNAP; |
|
else |
|
return -EROFS; |
|
} |
|
/* don't allow cross-quota renames */ |
|
if ((old_dir != new_dir) && |
|
(!ceph_quota_is_same_realm(old_dir, new_dir))) |
|
return -EXDEV; |
|
|
|
dout("rename dir %p dentry %p to dir %p dentry %p\n", |
|
old_dir, old_dentry, new_dir, new_dentry); |
|
req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); |
|
if (IS_ERR(req)) |
|
return PTR_ERR(req); |
|
ihold(old_dir); |
|
req->r_dentry = dget(new_dentry); |
|
req->r_num_caps = 2; |
|
req->r_old_dentry = dget(old_dentry); |
|
req->r_old_dentry_dir = old_dir; |
|
req->r_parent = new_dir; |
|
set_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags); |
|
req->r_old_dentry_drop = CEPH_CAP_FILE_SHARED; |
|
req->r_old_dentry_unless = CEPH_CAP_FILE_EXCL; |
|
req->r_dentry_drop = CEPH_CAP_FILE_SHARED; |
|
req->r_dentry_unless = CEPH_CAP_FILE_EXCL; |
|
/* release LINK_RDCACHE on source inode (mds will lock it) */ |
|
req->r_old_inode_drop = CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL; |
|
if (d_really_is_positive(new_dentry)) { |
|
req->r_inode_drop = |
|
ceph_drop_caps_for_unlink(d_inode(new_dentry)); |
|
} |
|
err = ceph_mdsc_do_request(mdsc, old_dir, req); |
|
if (!err && !req->r_reply_info.head->is_dentry) { |
|
/* |
|
* Normally d_move() is done by fill_trace (called by |
|
* do_request, above). If there is no trace, we need |
|
* to do it here. |
|
*/ |
|
d_move(old_dentry, new_dentry); |
|
} |
|
ceph_mdsc_put_request(req); |
|
return err; |
|
} |
|
|
|
/* |
|
* Move dentry to tail of mdsc->dentry_leases list when lease is updated. |
|
* Leases at front of the list will expire first. (Assume all leases have |
|
* similar duration) |
|
* |
|
* Called under dentry->d_lock. |
|
*/ |
|
void __ceph_dentry_lease_touch(struct ceph_dentry_info *di) |
|
{ |
|
struct dentry *dn = di->dentry; |
|
struct ceph_mds_client *mdsc; |
|
|
|
dout("dentry_lease_touch %p %p '%pd'\n", di, dn, dn); |
|
|
|
di->flags |= CEPH_DENTRY_LEASE_LIST; |
|
if (di->flags & CEPH_DENTRY_SHRINK_LIST) { |
|
di->flags |= CEPH_DENTRY_REFERENCED; |
|
return; |
|
} |
|
|
|
mdsc = ceph_sb_to_client(dn->d_sb)->mdsc; |
|
spin_lock(&mdsc->dentry_list_lock); |
|
list_move_tail(&di->lease_list, &mdsc->dentry_leases); |
|
spin_unlock(&mdsc->dentry_list_lock); |
|
} |
|
|
|
static void __dentry_dir_lease_touch(struct ceph_mds_client* mdsc, |
|
struct ceph_dentry_info *di) |
|
{ |
|
di->flags &= ~(CEPH_DENTRY_LEASE_LIST | CEPH_DENTRY_REFERENCED); |
|
di->lease_gen = 0; |
|
di->time = jiffies; |
|
list_move_tail(&di->lease_list, &mdsc->dentry_dir_leases); |
|
} |
|
|
|
/* |
|
* When dir lease is used, add dentry to tail of mdsc->dentry_dir_leases |
|
* list if it's not in the list, otherwise set 'referenced' flag. |
|
* |
|
* Called under dentry->d_lock. |
|
*/ |
|
void __ceph_dentry_dir_lease_touch(struct ceph_dentry_info *di) |
|
{ |
|
struct dentry *dn = di->dentry; |
|
struct ceph_mds_client *mdsc; |
|
|
|
dout("dentry_dir_lease_touch %p %p '%pd' (offset 0x%llx)\n", |
|
di, dn, dn, di->offset); |
|
|
|
if (!list_empty(&di->lease_list)) { |
|
if (di->flags & CEPH_DENTRY_LEASE_LIST) { |
|
/* don't remove dentry from dentry lease list |
|
* if its lease is valid */ |
|
if (__dentry_lease_is_valid(di)) |
|
return; |
|
} else { |
|
di->flags |= CEPH_DENTRY_REFERENCED; |
|
return; |
|
} |
|
} |
|
|
|
if (di->flags & CEPH_DENTRY_SHRINK_LIST) { |
|
di->flags |= CEPH_DENTRY_REFERENCED; |
|
di->flags &= ~CEPH_DENTRY_LEASE_LIST; |
|
return; |
|
} |
|
|
|
mdsc = ceph_sb_to_client(dn->d_sb)->mdsc; |
|
spin_lock(&mdsc->dentry_list_lock); |
|
__dentry_dir_lease_touch(mdsc, di), |
|
spin_unlock(&mdsc->dentry_list_lock); |
|
} |
|
|
|
static void __dentry_lease_unlist(struct ceph_dentry_info *di) |
|
{ |
|
struct ceph_mds_client *mdsc; |
|
if (di->flags & CEPH_DENTRY_SHRINK_LIST) |
|
return; |
|
if (list_empty(&di->lease_list)) |
|
return; |
|
|
|
mdsc = ceph_sb_to_client(di->dentry->d_sb)->mdsc; |
|
spin_lock(&mdsc->dentry_list_lock); |
|
list_del_init(&di->lease_list); |
|
spin_unlock(&mdsc->dentry_list_lock); |
|
} |
|
|
|
enum { |
|
KEEP = 0, |
|
DELETE = 1, |
|
TOUCH = 2, |
|
STOP = 4, |
|
}; |
|
|
|
struct ceph_lease_walk_control { |
|
bool dir_lease; |
|
bool expire_dir_lease; |
|
unsigned long nr_to_scan; |
|
unsigned long dir_lease_ttl; |
|
}; |
|
|
|
static unsigned long |
|
__dentry_leases_walk(struct ceph_mds_client *mdsc, |
|
struct ceph_lease_walk_control *lwc, |
|
int (*check)(struct dentry*, void*)) |
|
{ |
|
struct ceph_dentry_info *di, *tmp; |
|
struct dentry *dentry, *last = NULL; |
|
struct list_head* list; |
|
LIST_HEAD(dispose); |
|
unsigned long freed = 0; |
|
int ret = 0; |
|
|
|
list = lwc->dir_lease ? &mdsc->dentry_dir_leases : &mdsc->dentry_leases; |
|
spin_lock(&mdsc->dentry_list_lock); |
|
list_for_each_entry_safe(di, tmp, list, lease_list) { |
|
if (!lwc->nr_to_scan) |
|
break; |
|
--lwc->nr_to_scan; |
|
|
|
dentry = di->dentry; |
|
if (last == dentry) |
|
break; |
|
|
|
if (!spin_trylock(&dentry->d_lock)) |
|
continue; |
|
|
|
if (__lockref_is_dead(&dentry->d_lockref)) { |
|
list_del_init(&di->lease_list); |
|
goto next; |
|
} |
|
|
|
ret = check(dentry, lwc); |
|
if (ret & TOUCH) { |
|
/* move it into tail of dir lease list */ |
|
__dentry_dir_lease_touch(mdsc, di); |
|
if (!last) |
|
last = dentry; |
|
} |
|
if (ret & DELETE) { |
|
/* stale lease */ |
|
di->flags &= ~CEPH_DENTRY_REFERENCED; |
|
if (dentry->d_lockref.count > 0) { |
|
/* update_dentry_lease() will re-add |
|
* it to lease list, or |
|
* ceph_d_delete() will return 1 when |
|
* last reference is dropped */ |
|
list_del_init(&di->lease_list); |
|
} else { |
|
di->flags |= CEPH_DENTRY_SHRINK_LIST; |
|
list_move_tail(&di->lease_list, &dispose); |
|
dget_dlock(dentry); |
|
} |
|
} |
|
next: |
|
spin_unlock(&dentry->d_lock); |
|
if (ret & STOP) |
|
break; |
|
} |
|
spin_unlock(&mdsc->dentry_list_lock); |
|
|
|
while (!list_empty(&dispose)) { |
|
di = list_first_entry(&dispose, struct ceph_dentry_info, |
|
lease_list); |
|
dentry = di->dentry; |
|
spin_lock(&dentry->d_lock); |
|
|
|
list_del_init(&di->lease_list); |
|
di->flags &= ~CEPH_DENTRY_SHRINK_LIST; |
|
if (di->flags & CEPH_DENTRY_REFERENCED) { |
|
spin_lock(&mdsc->dentry_list_lock); |
|
if (di->flags & CEPH_DENTRY_LEASE_LIST) { |
|
list_add_tail(&di->lease_list, |
|
&mdsc->dentry_leases); |
|
} else { |
|
__dentry_dir_lease_touch(mdsc, di); |
|
} |
|
spin_unlock(&mdsc->dentry_list_lock); |
|
} else { |
|
freed++; |
|
} |
|
|
|
spin_unlock(&dentry->d_lock); |
|
/* ceph_d_delete() does the trick */ |
|
dput(dentry); |
|
} |
|
return freed; |
|
} |
|
|
|
static int __dentry_lease_check(struct dentry *dentry, void *arg) |
|
{ |
|
struct ceph_dentry_info *di = ceph_dentry(dentry); |
|
int ret; |
|
|
|
if (__dentry_lease_is_valid(di)) |
|
return STOP; |
|
ret = __dir_lease_try_check(dentry); |
|
if (ret == -EBUSY) |
|
return KEEP; |
|
if (ret > 0) |
|
return TOUCH; |
|
return DELETE; |
|
} |
|
|
|
static int __dir_lease_check(struct dentry *dentry, void *arg) |
|
{ |
|
struct ceph_lease_walk_control *lwc = arg; |
|
struct ceph_dentry_info *di = ceph_dentry(dentry); |
|
|
|
int ret = __dir_lease_try_check(dentry); |
|
if (ret == -EBUSY) |
|
return KEEP; |
|
if (ret > 0) { |
|
if (time_before(jiffies, di->time + lwc->dir_lease_ttl)) |
|
return STOP; |
|
/* Move dentry to tail of dir lease list if we don't want |
|
* to delete it. So dentries in the list are checked in a |
|
* round robin manner */ |
|
if (!lwc->expire_dir_lease) |
|
return TOUCH; |
|
if (dentry->d_lockref.count > 0 || |
|
(di->flags & CEPH_DENTRY_REFERENCED)) |
|
return TOUCH; |
|
/* invalidate dir lease */ |
|
di->lease_shared_gen = 0; |
|
} |
|
return DELETE; |
|
} |
|
|
|
int ceph_trim_dentries(struct ceph_mds_client *mdsc) |
|
{ |
|
struct ceph_lease_walk_control lwc; |
|
unsigned long count; |
|
unsigned long freed; |
|
|
|
spin_lock(&mdsc->caps_list_lock); |
|
if (mdsc->caps_use_max > 0 && |
|
mdsc->caps_use_count > mdsc->caps_use_max) |
|
count = mdsc->caps_use_count - mdsc->caps_use_max; |
|
else |
|
count = 0; |
|
spin_unlock(&mdsc->caps_list_lock); |
|
|
|
lwc.dir_lease = false; |
|
lwc.nr_to_scan = CEPH_CAPS_PER_RELEASE * 2; |
|
freed = __dentry_leases_walk(mdsc, &lwc, __dentry_lease_check); |
|
if (!lwc.nr_to_scan) /* more invalid leases */ |
|
return -EAGAIN; |
|
|
|
if (lwc.nr_to_scan < CEPH_CAPS_PER_RELEASE) |
|
lwc.nr_to_scan = CEPH_CAPS_PER_RELEASE; |
|
|
|
lwc.dir_lease = true; |
|
lwc.expire_dir_lease = freed < count; |
|
lwc.dir_lease_ttl = mdsc->fsc->mount_options->caps_wanted_delay_max * HZ; |
|
freed +=__dentry_leases_walk(mdsc, &lwc, __dir_lease_check); |
|
if (!lwc.nr_to_scan) /* more to check */ |
|
return -EAGAIN; |
|
|
|
return freed > 0 ? 1 : 0; |
|
} |
|
|
|
/* |
|
* Ensure a dentry lease will no longer revalidate. |
|
*/ |
|
void ceph_invalidate_dentry_lease(struct dentry *dentry) |
|
{ |
|
struct ceph_dentry_info *di = ceph_dentry(dentry); |
|
spin_lock(&dentry->d_lock); |
|
di->time = jiffies; |
|
di->lease_shared_gen = 0; |
|
di->flags &= ~CEPH_DENTRY_PRIMARY_LINK; |
|
__dentry_lease_unlist(di); |
|
spin_unlock(&dentry->d_lock); |
|
} |
|
|
|
/* |
|
* Check if dentry lease is valid. If not, delete the lease. Try to |
|
* renew if the least is more than half up. |
|
*/ |
|
static bool __dentry_lease_is_valid(struct ceph_dentry_info *di) |
|
{ |
|
struct ceph_mds_session *session; |
|
|
|
if (!di->lease_gen) |
|
return false; |
|
|
|
session = di->lease_session; |
|
if (session) { |
|
u32 gen; |
|
unsigned long ttl; |
|
|
|
spin_lock(&session->s_gen_ttl_lock); |
|
gen = session->s_cap_gen; |
|
ttl = session->s_cap_ttl; |
|
spin_unlock(&session->s_gen_ttl_lock); |
|
|
|
if (di->lease_gen == gen && |
|
time_before(jiffies, ttl) && |
|
time_before(jiffies, di->time)) |
|
return true; |
|
} |
|
di->lease_gen = 0; |
|
return false; |
|
} |
|
|
|
static int dentry_lease_is_valid(struct dentry *dentry, unsigned int flags) |
|
{ |
|
struct ceph_dentry_info *di; |
|
struct ceph_mds_session *session = NULL; |
|
u32 seq = 0; |
|
int valid = 0; |
|
|
|
spin_lock(&dentry->d_lock); |
|
di = ceph_dentry(dentry); |
|
if (di && __dentry_lease_is_valid(di)) { |
|
valid = 1; |
|
|
|
if (di->lease_renew_after && |
|
time_after(jiffies, di->lease_renew_after)) { |
|
/* |
|
* We should renew. If we're in RCU walk mode |
|
* though, we can't do that so just return |
|
* -ECHILD. |
|
*/ |
|
if (flags & LOOKUP_RCU) { |
|
valid = -ECHILD; |
|
} else { |
|
session = ceph_get_mds_session(di->lease_session); |
|
seq = di->lease_seq; |
|
di->lease_renew_after = 0; |
|
di->lease_renew_from = jiffies; |
|
} |
|
} |
|
} |
|
spin_unlock(&dentry->d_lock); |
|
|
|
if (session) { |
|
ceph_mdsc_lease_send_msg(session, dentry, |
|
CEPH_MDS_LEASE_RENEW, seq); |
|
ceph_put_mds_session(session); |
|
} |
|
dout("dentry_lease_is_valid - dentry %p = %d\n", dentry, valid); |
|
return valid; |
|
} |
|
|
|
/* |
|
* Called under dentry->d_lock. |
|
*/ |
|
static int __dir_lease_try_check(const struct dentry *dentry) |
|
{ |
|
struct ceph_dentry_info *di = ceph_dentry(dentry); |
|
struct inode *dir; |
|
struct ceph_inode_info *ci; |
|
int valid = 0; |
|
|
|
if (!di->lease_shared_gen) |
|
return 0; |
|
if (IS_ROOT(dentry)) |
|
return 0; |
|
|
|
dir = d_inode(dentry->d_parent); |
|
ci = ceph_inode(dir); |
|
|
|
if (spin_trylock(&ci->i_ceph_lock)) { |
|
if (atomic_read(&ci->i_shared_gen) == di->lease_shared_gen && |
|
__ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 0)) |
|
valid = 1; |
|
spin_unlock(&ci->i_ceph_lock); |
|
} else { |
|
valid = -EBUSY; |
|
} |
|
|
|
if (!valid) |
|
di->lease_shared_gen = 0; |
|
return valid; |
|
} |
|
|
|
/* |
|
* Check if directory-wide content lease/cap is valid. |
|
*/ |
|
static int dir_lease_is_valid(struct inode *dir, struct dentry *dentry, |
|
struct ceph_mds_client *mdsc) |
|
{ |
|
struct ceph_inode_info *ci = ceph_inode(dir); |
|
int valid; |
|
int shared_gen; |
|
|
|
spin_lock(&ci->i_ceph_lock); |
|
valid = __ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1); |
|
if (valid) { |
|
__ceph_touch_fmode(ci, mdsc, CEPH_FILE_MODE_RD); |
|
shared_gen = atomic_read(&ci->i_shared_gen); |
|
} |
|
spin_unlock(&ci->i_ceph_lock); |
|
if (valid) { |
|
struct ceph_dentry_info *di; |
|
spin_lock(&dentry->d_lock); |
|
di = ceph_dentry(dentry); |
|
if (dir == d_inode(dentry->d_parent) && |
|
di && di->lease_shared_gen == shared_gen) |
|
__ceph_dentry_dir_lease_touch(di); |
|
else |
|
valid = 0; |
|
spin_unlock(&dentry->d_lock); |
|
} |
|
dout("dir_lease_is_valid dir %p v%u dentry %p = %d\n", |
|
dir, (unsigned)atomic_read(&ci->i_shared_gen), dentry, valid); |
|
return valid; |
|
} |
|
|
|
/* |
|
* Check if cached dentry can be trusted. |
|
*/ |
|
static int ceph_d_revalidate(struct dentry *dentry, unsigned int flags) |
|
{ |
|
int valid = 0; |
|
struct dentry *parent; |
|
struct inode *dir, *inode; |
|
struct ceph_mds_client *mdsc; |
|
|
|
if (flags & LOOKUP_RCU) { |
|
parent = READ_ONCE(dentry->d_parent); |
|
dir = d_inode_rcu(parent); |
|
if (!dir) |
|
return -ECHILD; |
|
inode = d_inode_rcu(dentry); |
|
} else { |
|
parent = dget_parent(dentry); |
|
dir = d_inode(parent); |
|
inode = d_inode(dentry); |
|
} |
|
|
|
dout("d_revalidate %p '%pd' inode %p offset 0x%llx\n", dentry, |
|
dentry, inode, ceph_dentry(dentry)->offset); |
|
|
|
mdsc = ceph_sb_to_client(dir->i_sb)->mdsc; |
|
|
|
/* always trust cached snapped dentries, snapdir dentry */ |
|
if (ceph_snap(dir) != CEPH_NOSNAP) { |
|
dout("d_revalidate %p '%pd' inode %p is SNAPPED\n", dentry, |
|
dentry, inode); |
|
valid = 1; |
|
} else if (inode && ceph_snap(inode) == CEPH_SNAPDIR) { |
|
valid = 1; |
|
} else { |
|
valid = dentry_lease_is_valid(dentry, flags); |
|
if (valid == -ECHILD) |
|
return valid; |
|
if (valid || dir_lease_is_valid(dir, dentry, mdsc)) { |
|
if (inode) |
|
valid = ceph_is_any_caps(inode); |
|
else |
|
valid = 1; |
|
} |
|
} |
|
|
|
if (!valid) { |
|
struct ceph_mds_request *req; |
|
int op, err; |
|
u32 mask; |
|
|
|
if (flags & LOOKUP_RCU) |
|
return -ECHILD; |
|
|
|
percpu_counter_inc(&mdsc->metric.d_lease_mis); |
|
|
|
op = ceph_snap(dir) == CEPH_SNAPDIR ? |
|
CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP; |
|
req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS); |
|
if (!IS_ERR(req)) { |
|
req->r_dentry = dget(dentry); |
|
req->r_num_caps = 2; |
|
req->r_parent = dir; |
|
|
|
mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED; |
|
if (ceph_security_xattr_wanted(dir)) |
|
mask |= CEPH_CAP_XATTR_SHARED; |
|
req->r_args.getattr.mask = cpu_to_le32(mask); |
|
|
|
err = ceph_mdsc_do_request(mdsc, NULL, req); |
|
switch (err) { |
|
case 0: |
|
if (d_really_is_positive(dentry) && |
|
d_inode(dentry) == req->r_target_inode) |
|
valid = 1; |
|
break; |
|
case -ENOENT: |
|
if (d_really_is_negative(dentry)) |
|
valid = 1; |
|
fallthrough; |
|
default: |
|
break; |
|
} |
|
ceph_mdsc_put_request(req); |
|
dout("d_revalidate %p lookup result=%d\n", |
|
dentry, err); |
|
} |
|
} else { |
|
percpu_counter_inc(&mdsc->metric.d_lease_hit); |
|
} |
|
|
|
dout("d_revalidate %p %s\n", dentry, valid ? "valid" : "invalid"); |
|
if (!valid) |
|
ceph_dir_clear_complete(dir); |
|
|
|
if (!(flags & LOOKUP_RCU)) |
|
dput(parent); |
|
return valid; |
|
} |
|
|
|
/* |
|
* Delete unused dentry that doesn't have valid lease |
|
* |
|
* Called under dentry->d_lock. |
|
*/ |
|
static int ceph_d_delete(const struct dentry *dentry) |
|
{ |
|
struct ceph_dentry_info *di; |
|
|
|
/* won't release caps */ |
|
if (d_really_is_negative(dentry)) |
|
return 0; |
|
if (ceph_snap(d_inode(dentry)) != CEPH_NOSNAP) |
|
return 0; |
|
/* vaild lease? */ |
|
di = ceph_dentry(dentry); |
|
if (di) { |
|
if (__dentry_lease_is_valid(di)) |
|
return 0; |
|
if (__dir_lease_try_check(dentry)) |
|
return 0; |
|
} |
|
return 1; |
|
} |
|
|
|
/* |
|
* Release our ceph_dentry_info. |
|
*/ |
|
static void ceph_d_release(struct dentry *dentry) |
|
{ |
|
struct ceph_dentry_info *di = ceph_dentry(dentry); |
|
struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb); |
|
|
|
dout("d_release %p\n", dentry); |
|
|
|
atomic64_dec(&fsc->mdsc->metric.total_dentries); |
|
|
|
spin_lock(&dentry->d_lock); |
|
__dentry_lease_unlist(di); |
|
dentry->d_fsdata = NULL; |
|
spin_unlock(&dentry->d_lock); |
|
|
|
if (di->lease_session) |
|
ceph_put_mds_session(di->lease_session); |
|
kmem_cache_free(ceph_dentry_cachep, di); |
|
} |
|
|
|
/* |
|
* When the VFS prunes a dentry from the cache, we need to clear the |
|
* complete flag on the parent directory. |
|
* |
|
* Called under dentry->d_lock. |
|
*/ |
|
static void ceph_d_prune(struct dentry *dentry) |
|
{ |
|
struct ceph_inode_info *dir_ci; |
|
struct ceph_dentry_info *di; |
|
|
|
dout("ceph_d_prune %pd %p\n", dentry, dentry); |
|
|
|
/* do we have a valid parent? */ |
|
if (IS_ROOT(dentry)) |
|
return; |
|
|
|
/* we hold d_lock, so d_parent is stable */ |
|
dir_ci = ceph_inode(d_inode(dentry->d_parent)); |
|
if (dir_ci->i_vino.snap == CEPH_SNAPDIR) |
|
return; |
|
|
|
/* who calls d_delete() should also disable dcache readdir */ |
|
if (d_really_is_negative(dentry)) |
|
return; |
|
|
|
/* d_fsdata does not get cleared until d_release */ |
|
if (!d_unhashed(dentry)) { |
|
__ceph_dir_clear_complete(dir_ci); |
|
return; |
|
} |
|
|
|
/* Disable dcache readdir just in case that someone called d_drop() |
|
* or d_invalidate(), but MDS didn't revoke CEPH_CAP_FILE_SHARED |
|
* properly (dcache readdir is still enabled) */ |
|
di = ceph_dentry(dentry); |
|
if (di->offset > 0 && |
|
di->lease_shared_gen == atomic_read(&dir_ci->i_shared_gen)) |
|
__ceph_dir_clear_ordered(dir_ci); |
|
} |
|
|
|
/* |
|
* read() on a dir. This weird interface hack only works if mounted |
|
* with '-o dirstat'. |
|
*/ |
|
static ssize_t ceph_read_dir(struct file *file, char __user *buf, size_t size, |
|
loff_t *ppos) |
|
{ |
|
struct ceph_dir_file_info *dfi = file->private_data; |
|
struct inode *inode = file_inode(file); |
|
struct ceph_inode_info *ci = ceph_inode(inode); |
|
int left; |
|
const int bufsize = 1024; |
|
|
|
if (!ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb), DIRSTAT)) |
|
return -EISDIR; |
|
|
|
if (!dfi->dir_info) { |
|
dfi->dir_info = kmalloc(bufsize, GFP_KERNEL); |
|
if (!dfi->dir_info) |
|
return -ENOMEM; |
|
dfi->dir_info_len = |
|
snprintf(dfi->dir_info, bufsize, |
|
"entries: %20lld\n" |
|
" files: %20lld\n" |
|
" subdirs: %20lld\n" |
|
"rentries: %20lld\n" |
|
" rfiles: %20lld\n" |
|
" rsubdirs: %20lld\n" |
|
"rbytes: %20lld\n" |
|
"rctime: %10lld.%09ld\n", |
|
ci->i_files + ci->i_subdirs, |
|
ci->i_files, |
|
ci->i_subdirs, |
|
ci->i_rfiles + ci->i_rsubdirs, |
|
ci->i_rfiles, |
|
ci->i_rsubdirs, |
|
ci->i_rbytes, |
|
ci->i_rctime.tv_sec, |
|
ci->i_rctime.tv_nsec); |
|
} |
|
|
|
if (*ppos >= dfi->dir_info_len) |
|
return 0; |
|
size = min_t(unsigned, size, dfi->dir_info_len-*ppos); |
|
left = copy_to_user(buf, dfi->dir_info + *ppos, size); |
|
if (left == size) |
|
return -EFAULT; |
|
*ppos += (size - left); |
|
return size - left; |
|
} |
|
|
|
|
|
|
|
/* |
|
* Return name hash for a given dentry. This is dependent on |
|
* the parent directory's hash function. |
|
*/ |
|
unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn) |
|
{ |
|
struct ceph_inode_info *dci = ceph_inode(dir); |
|
unsigned hash; |
|
|
|
switch (dci->i_dir_layout.dl_dir_hash) { |
|
case 0: /* for backward compat */ |
|
case CEPH_STR_HASH_LINUX: |
|
return dn->d_name.hash; |
|
|
|
default: |
|
spin_lock(&dn->d_lock); |
|
hash = ceph_str_hash(dci->i_dir_layout.dl_dir_hash, |
|
dn->d_name.name, dn->d_name.len); |
|
spin_unlock(&dn->d_lock); |
|
return hash; |
|
} |
|
} |
|
|
|
const struct file_operations ceph_dir_fops = { |
|
.read = ceph_read_dir, |
|
.iterate = ceph_readdir, |
|
.llseek = ceph_dir_llseek, |
|
.open = ceph_open, |
|
.release = ceph_release, |
|
.unlocked_ioctl = ceph_ioctl, |
|
.compat_ioctl = compat_ptr_ioctl, |
|
.fsync = ceph_fsync, |
|
.lock = ceph_lock, |
|
.flock = ceph_flock, |
|
}; |
|
|
|
const struct file_operations ceph_snapdir_fops = { |
|
.iterate = ceph_readdir, |
|
.llseek = ceph_dir_llseek, |
|
.open = ceph_open, |
|
.release = ceph_release, |
|
}; |
|
|
|
const struct inode_operations ceph_dir_iops = { |
|
.lookup = ceph_lookup, |
|
.permission = ceph_permission, |
|
.getattr = ceph_getattr, |
|
.setattr = ceph_setattr, |
|
.listxattr = ceph_listxattr, |
|
.get_acl = ceph_get_acl, |
|
.set_acl = ceph_set_acl, |
|
.mknod = ceph_mknod, |
|
.symlink = ceph_symlink, |
|
.mkdir = ceph_mkdir, |
|
.link = ceph_link, |
|
.unlink = ceph_unlink, |
|
.rmdir = ceph_unlink, |
|
.rename = ceph_rename, |
|
.create = ceph_create, |
|
.atomic_open = ceph_atomic_open, |
|
}; |
|
|
|
const struct inode_operations ceph_snapdir_iops = { |
|
.lookup = ceph_lookup, |
|
.permission = ceph_permission, |
|
.getattr = ceph_getattr, |
|
.mkdir = ceph_mkdir, |
|
.rmdir = ceph_unlink, |
|
.rename = ceph_rename, |
|
}; |
|
|
|
const struct dentry_operations ceph_dentry_ops = { |
|
.d_revalidate = ceph_d_revalidate, |
|
.d_delete = ceph_d_delete, |
|
.d_release = ceph_d_release, |
|
.d_prune = ceph_d_prune, |
|
.d_init = ceph_d_init, |
|
};
|
|
|