summaryrefslogtreecommitdiffstats
path: root/Documentation/filesystems/vfs.txt
diff options
context:
space:
mode:
authorEric Biggers <ebiggers@google.com>2019-04-12 01:16:28 +0200
committerAl Viro <viro@zeniv.linux.org.uk>2019-05-01 05:59:25 +0200
commitdcb2cb1f26f91df486492e2f2c2d62fe751fd21a (patch)
tree90d33b68a636396a61e8f7f57db225be1c2188b5 /Documentation/filesystems/vfs.txt
parentDocumentation/filesystems/vfs.txt: remove bogus "Last updated" date (diff)
downloadlinux-dcb2cb1f26f91df486492e2f2c2d62fe751fd21a.tar.xz
linux-dcb2cb1f26f91df486492e2f2c2d62fe751fd21a.zip
Documentation/filesystems/vfs.txt: document how ->i_link works
Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'Documentation/filesystems/vfs.txt')
-rw-r--r--Documentation/filesystems/vfs.txt6
1 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/filesystems/vfs.txt b/Documentation/filesystems/vfs.txt
index 33120f220f86..57fc576b1f3e 100644
--- a/Documentation/filesystems/vfs.txt
+++ b/Documentation/filesystems/vfs.txt
@@ -463,6 +463,12 @@ otherwise noted.
argument. If request can't be handled without leaving RCU mode,
have it return ERR_PTR(-ECHILD).
+ If the filesystem stores the symlink target in ->i_link, the
+ VFS may use it directly without calling ->get_link(); however,
+ ->get_link() must still be provided. ->i_link must not be
+ freed until after an RCU grace period. Writing to ->i_link
+ post-iget() time requires a 'release' memory barrier.
+
readlink: this is now just an override for use by readlink(2) for the
cases when ->get_link uses nd_jump_link() or object is not in
fact a symlink. Normally filesystems should only implement