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/linux-4.4.14/Documentation/filesystems/
Dpath-lookup.txt94 These members are also protected by d_seq seqlock, although this offers
96 using d_seq for synchronisation (see seqcount based lookups, below).
184 dentry seqlock (d_seq) is used to take a "coherent snapshot" of what the dentry
186 the next part of the path walk. When loading the coherent snapshot under d_seq,
201 provided that d_seq is rechecked after that operation is complete.
226 path string, rcu-walk uses a d_seq protected snapshot. When looking up a
227 child of this parent snapshot, we open d_seq critical section on the child
228 before closing d_seq critical section on the parent. This gives an interlocking
246 +---------------------+ rcu-walk begins here, we note d_seq, check the
254 | name: "home" | hash lookup, then note d_seq and compare name
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/linux-4.4.14/fs/
Ddcache.c322 write_seqcount_invalidate(&dentry->d_seq); in dentry_rcuwalk_invalidate()
361 raw_write_seqcount_begin(&dentry->d_seq); in dentry_unlink_inode()
364 raw_write_seqcount_end(&dentry->d_seq); in dentry_unlink_inode()
1589 seqcount_init(&dentry->d_seq); in __d_alloc()
1752 raw_write_seqcount_begin(&dentry->d_seq); in __d_instantiate()
1754 raw_write_seqcount_end(&dentry->d_seq); in __d_instantiate()
2108 if (read_seqcount_retry(&dentry->d_seq, seq)) { in slow_dentry_cmp()
2194 seq = raw_seqcount_begin(&dentry->d_seq); in __d_lookup_rcu()
2460 write_seqcount_begin(&dentry->d_seq); in dentry_update_name_case()
2462 write_seqcount_end(&dentry->d_seq); in dentry_update_name_case()
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Dnamei.c639 return !read_seqcount_retry(&path->dentry->d_seq, seq); in legitimize_path()
706 if (read_seqcount_retry(&parent->d_seq, nd->seq)) in unlazy_walk()
712 if (read_seqcount_retry(&dentry->d_seq, seq)) in unlazy_walk()
821 nd->root_seq = __read_seqcount_begin(&nd->root.dentry->d_seq); in set_root_rcu()
1026 if (unlikely(read_seqcount_retry(&d->d_seq, nd->seq))) in get_link()
1282 *seqp = read_seqcount_begin(&path->dentry->d_seq); in __follow_mount_rcu()
1309 seq = read_seqcount_begin(&parent->d_seq); in follow_dotdot_rcu()
1310 if (unlikely(read_seqcount_retry(&old->d_seq, nd->seq))) in follow_dotdot_rcu()
1322 unsigned seq = read_seqcount_begin(&mountpoint->d_seq); in follow_dotdot_rcu()
1344 nd->seq = read_seqcount_begin(&nd->path.dentry->d_seq); in follow_dotdot_rcu()
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/linux-4.4.14/include/linux/
Ddcache.h111 seqcount_t d_seq; /* per dentry seqlock */ member