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| author | Eric W. Biederman <ebiederm@xmission.com> | 2014-02-12 16:08:06 -0800 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2014-10-09 02:38:53 -0400 |
| commit | 3ccb354d641d910309b916b9c856e2a82ced7237 (patch) | |
| tree | 7439690ff7654285fd1f50a0e6e44705ae8cabed /fs/dcache.c | |
| parent | 9ea459e110df32e60a762f311f7939eaa879601d (diff) | |
| download | lwn-3ccb354d641d910309b916b9c856e2a82ced7237.tar.gz lwn-3ccb354d641d910309b916b9c856e2a82ced7237.zip | |
vfs: Document the effect of d_revalidate on d_find_alias
d_drop or check_submounts_and_drop called from d_revalidate can result
in renamed directories with child dentries being unhashed. These
renamed and drop directory dentries can be rehashed after
d_materialise_unique uses d_find_alias to find them.
Reviewed-by: Miklos Szeredi <miklos@szeredi.hu>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/dcache.c')
| -rw-r--r-- | fs/dcache.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/dcache.c b/fs/dcache.c index 4858d2e5cf2e..1f8e6acb0ea4 100644 --- a/fs/dcache.c +++ b/fs/dcache.c @@ -761,7 +761,8 @@ EXPORT_SYMBOL(dget_parent); * acquire the reference to alias and return it. Otherwise return NULL. * Notice that if inode is a directory there can be only one alias and * it can be unhashed only if it has no children, or if it is the root - * of a filesystem. + * of a filesystem, or if the directory was renamed and d_revalidate + * was the first vfs operation to notice. * * If the inode has an IS_ROOT, DCACHE_DISCONNECTED alias, then prefer * any other hashed alias over that one. |