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/linux-6.1.9/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.rst759 ``dentry->d_seq`` and ``nd->seq``
763 the per-dentry ``d_seq`` seqlock, and stores the sequence number in the
773 When not at a mount point, ``d_parent`` is followed and its ``d_seq`` is
776 ``d_seq``. Then, after finally finding a ``d_parent`` to follow, we must
846 handled immediately, such as ``mount_lock`` or one of the ``d_seq``
/linux-6.1.9/fs/
Ddcache.c390 raw_write_seqcount_begin(&dentry->d_seq); in dentry_unlink_inode()
393 raw_write_seqcount_end(&dentry->d_seq); in dentry_unlink_inode()
509 write_seqcount_invalidate(&dentry->d_seq); in __d_drop()
967 seq = raw_seqcount_begin(&dentry->d_seq); in dget_parent()
972 if (!read_seqcount_retry(&dentry->d_seq, seq)) in dget_parent()
1810 seqcount_spinlock_init(&dentry->d_seq, &dentry->d_lock); in __d_alloc()
2008 raw_write_seqcount_begin(&dentry->d_seq); in __d_instantiate()
2010 raw_write_seqcount_end(&dentry->d_seq); in __d_instantiate()
2293 seq = raw_seqcount_begin(&dentry->d_seq); in __d_lookup_rcu_op_compare()
2303 if (read_seqcount_retry(&dentry->d_seq, seq)) { in __d_lookup_rcu_op_compare()
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Dnamei.c709 return !read_seqcount_retry(&path->dentry->d_seq, seq); in __legitimize_path()
829 if (read_seqcount_retry(&dentry->d_seq, nd->next_seq)) in try_to_unlazy_next()
944 nd->root_seq = __read_seqcount_begin(&nd->root.dentry->d_seq); in set_root()
973 if (read_seqcount_retry(&d->d_seq, nd->seq)) in nd_jump_root()
1303 *seqp = read_seqcount_begin(&mountpoint->d_seq); in choose_mountpoint_rcu()
1506 nd->next_seq = read_seqcount_begin(&dentry->d_seq); in __follow_mount_rcu()
1631 if (read_seqcount_retry(&parent->d_seq, nd->seq)) in lookup_fast()
1841 if (read_seqcount_retry(&path.dentry->d_seq, nd->next_seq)) in step_into()
1857 if (read_seqcount_retry(&path.dentry->d_seq, nd->next_seq)) in step_into()
1890 nd->next_seq = read_seqcount_begin(&parent->d_seq); in follow_dotdot_rcu()
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/linux-6.1.9/include/linux/
Ddcache.h85 seqcount_spinlock_t d_seq; /* per dentry seqlock */ member