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| author | Zhang Zhen <zhenzhang.zhang@huawei.com> | 2014-04-15 14:19:38 +0800 |
|---|---|---|
| committer | Jaegeuk Kim <jaegeuk.kim@samsung.com> | 2014-05-07 10:21:54 +0900 |
| commit | 8abfb36ab396377ea712cd640c525fd5535d1dc9 (patch) | |
| tree | 89e5bd1f683cc4428b95a66aa01303417249c8f8 /fs | |
| parent | b156d542415d88c265a0a579448a93e66aa18e33 (diff) | |
| download | talos-obmc-linux-8abfb36ab396377ea712cd640c525fd5535d1dc9.tar.gz talos-obmc-linux-8abfb36ab396377ea712cd640c525fd5535d1dc9.zip | |
f2fs: atomically set inode->i_flags in f2fs_set_inode_flags()
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>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/f2fs/inode.c | 17 |
1 files changed, 9 insertions, 8 deletions
diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c index ee829d360468..f7a655373c46 100644 --- a/fs/f2fs/inode.c +++ b/fs/f2fs/inode.c @@ -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) |
