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| author | Daeho Jeong <daeho.jeong@samsung.com> | 2016-04-26 05:22:35 +0200 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2016-04-26 05:22:35 +0200 |
| commit | c8585c6fcaf2011de54c3592e80a634a2b9e1a7f (patch) | |
| tree | 66b440a3e710ab4b63ae20200735a594bffb74cd /kernel/sys_ni.c | |
| parent | ext4: handle unwritten or delalloc buffers before enabling data journaling (diff) | |
| download | linux-c8585c6fcaf2011de54c3592e80a634a2b9e1a7f.tar.xz linux-c8585c6fcaf2011de54c3592e80a634a2b9e1a7f.zip | |
ext4: fix races between changing inode journal mode and ext4_writepages
In ext4, there is a race condition between changing inode journal mode
and ext4_writepages(). While ext4_writepages() is executed on a
non-journalled mode inode, the inode's journal mode could be enabled
by ioctl() and then, some pages dirtied after switching the journal
mode will be still exposed to ext4_writepages() in non-journaled mode.
To resolve this problem, we use fs-wide per-cpu rw semaphore by Jan
Kara's suggestion because we don't want to waste ext4_inode_info's
space for this extra rare case.
Signed-off-by: Daeho Jeong <daeho.jeong@samsung.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'kernel/sys_ni.c')
0 files changed, 0 insertions, 0 deletions