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f2fs: atomically set inode->i_flags in f2fs_set_inode_flags()

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Use set_mask_bits() to atomically set i_flags instead of clearing out the
S_IMMUTABLE, S_APPEND, etc. flags and then setting them from the
FS_IMMUTABLE_FL, FS_APPEND_FL, etc. flags, since this opens up a race
where an immutable file has the immutable flag cleared for a brief
window of time.

Signed-off-by: Zhang Zhen <zhenzhang.zhang@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
This commit is contained in:
Zhang Zhen 2014-04-15 14:19:38 +08:00 committed by Jaegeuk Kim
parent b156d54241
commit 8abfb36ab3
1 changed files with 9 additions and 8 deletions
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17
fs/f2fs/inode.c
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@ -12,6 +12,7 @@
#include <linux/f2fs_fs.h>
#include <linux/buffer_head.h>
#include <linux/writeback.h>
#include <linux/bitops.h>
#include "f2fs.h"
#include "node.h"
@ -21,20 +22,20 @@
void f2fs_set_inode_flags(struct inode *inode)
{
unsigned int flags = F2FS_I(inode)->i_flags;
inode->i_flags &= ~(S_SYNC | S_APPEND | S_IMMUTABLE |
S_NOATIME | S_DIRSYNC);
unsigned int new_fl = 0;
if (flags & FS_SYNC_FL)
inode->i_flags |= S_SYNC;
new_fl |= S_SYNC;
if (flags & FS_APPEND_FL)
inode->i_flags |= S_APPEND;
new_fl |= S_APPEND;
if (flags & FS_IMMUTABLE_FL)
inode->i_flags |= S_IMMUTABLE;
new_fl |= S_IMMUTABLE;
if (flags & FS_NOATIME_FL)
inode->i_flags |= S_NOATIME;
new_fl |= S_NOATIME;
if (flags & FS_DIRSYNC_FL)
inode->i_flags |= S_DIRSYNC;
new_fl |= S_DIRSYNC;
set_mask_bits(&inode->i_flags,
S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC, new_fl);
}
static void __get_inode_rdev(struct inode *inode, struct f2fs_inode *ri)