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fs: Skip atime update on frozen filesystem 

It is unexpected to block reading of frozen filesystem because of atime update.
Also handling blocking on frozen filesystem because of atime update would make
locking more complex than it already is. So just skip atime update when
filesystem is frozen like we skip it when filesystem is remounted read-only.

BugLink: https://bugs.launchpad.net/bugs/897421
Tested-by: Kamal Mostafa <kamal@canonical.com>
Tested-by: Peter M. Petrakis <peter.petrakis@canonical.com>
Tested-by: Dann Frazier <dann.frazier@canonical.com>
Tested-by: Massimo Morana <massimo.morana@canonical.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Jan Kara 2012-06-12 16:20:36 +02:00 committed by Al Viro
parent eb04c28288
commit 5d37e9e6de
1 changed files with 6 additions and 2 deletions
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8
fs/inode.c
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@ -1542,9 +1542,11 @@ void touch_atime(struct path *path)
if (timespec_equal(&inode->i_atime, &now))
return;
if (mnt_want_write(mnt))
if (!sb_start_write_trylock(inode->i_sb))
return;
if (__mnt_want_write(mnt))
goto skip_update;
/*
* File systems can error out when updating inodes if they need to
* allocate new space to modify an inode (such is the case for
@ -1553,7 +1555,9 @@ void touch_atime(struct path *path)
* so just ignore the return value.
*/
update_time(inode, &now, S_ATIME);
mnt_drop_write(mnt);
__mnt_drop_write(mnt);
skip_update:
sb_end_write(inode->i_sb);
}
EXPORT_SYMBOL(touch_atime);