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/Linux-v5.4/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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Dpath-lookup.rst744 ``dentry->d_seq`` and ``nd->seq``
748 the per-dentry ``d_seq`` seqlock, and stores the sequence number in the
758 When not at a mount point, ``d_parent`` is followed and its ``d_seq`` is
761 ``d_seq``. Then, after finally finding a ``d_parent`` to follow, we must
831 handled immediately, such as ``mount_lock`` or one of the ``d_seq``
/Linux-v5.4/fs/
Ddcache.c363 raw_write_seqcount_begin(&dentry->d_seq); in dentry_unlink_inode()
366 raw_write_seqcount_end(&dentry->d_seq); in dentry_unlink_inode()
499 write_seqcount_invalidate(&dentry->d_seq); in __d_drop()
1728 seqcount_init(&dentry->d_seq); in __d_alloc()
1926 raw_write_seqcount_begin(&dentry->d_seq); in __d_instantiate()
1928 raw_write_seqcount_end(&dentry->d_seq); in __d_instantiate()
2263 seq = raw_seqcount_begin(&dentry->d_seq); in __d_lookup_rcu()
2277 if (read_seqcount_retry(&dentry->d_seq, seq)) { in __d_lookup_rcu()
2521 unsigned seq, r_seq, d_seq; in d_alloc_parallel() local
2530 dentry = __d_lookup_rcu(parent, name, &d_seq); in d_alloc_parallel()
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Dnamei.c625 return !read_seqcount_retry(&path->dentry->d_seq, seq); in legitimize_path()
731 if (unlikely(read_seqcount_retry(&dentry->d_seq, seq))) in unlazy_child()
811 nd->root_seq = __read_seqcount_begin(&nd->root.dentry->d_seq); in set_root()
846 if (unlikely(read_seqcount_retry(&d->d_seq, nd->seq))) in nd_jump_root()
1331 *seqp = read_seqcount_begin(&path->dentry->d_seq); in __follow_mount_rcu()
1356 seq = read_seqcount_begin(&parent->d_seq); in follow_dotdot_rcu()
1357 if (unlikely(read_seqcount_retry(&old->d_seq, nd->seq))) in follow_dotdot_rcu()
1369 unsigned seq = read_seqcount_begin(&mountpoint->d_seq); in follow_dotdot_rcu()
1391 nd->seq = read_seqcount_begin(&nd->path.dentry->d_seq); in follow_dotdot_rcu()
1576 if (unlikely(read_seqcount_retry(&dentry->d_seq, seq))) in lookup_fast()
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/Linux-v5.4/include/linux/
Ddcache.h92 seqcount_t d_seq; /* per dentry seqlock */ member