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authorNeilBrown <neilb@suse.de>2015-03-23 05:37:40 +0300
committerAl Viro <viro@zeniv.linux.org.uk>2015-05-15 08:06:27 +0300
commit8fa9dd24667f2d6997ec21341019657342859d31 (patch)
treecb7dcfaa0346a06e527cd4d095d7305eda6686ad /include
parentbc40aee053be1c2c443e812034f41e1a3cf34752 (diff)
downloadlinux-8fa9dd24667f2d6997ec21341019657342859d31.tar.xz
VFS/namei: make the use of touch_atime() in get_link() RCU-safe.
touch_atime is not RCU-safe, and so cannot be called on an RCU walk. However, in situations where RCU-walk makes a difference, the symlink will likely to accessed much more often than it is useful to update the atime. So split out the test of "Does the atime actually need to be updated" into atime_needs_update(), and have get_link() unlazy if it finds that it will need to do that update. Signed-off-by: NeilBrown <neilb@suse.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'include')
-rw-r--r--include/linux/fs.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 8f738512c874..1426c435d455 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1880,6 +1880,7 @@ enum file_time_flags {
S_VERSION = 8,
};
+extern bool atime_needs_update(const struct path *, struct inode *);
extern void touch_atime(const struct path *);
static inline void file_accessed(struct file *file)
{