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authorRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>2015-04-16 12:46:50 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2015-04-17 09:04:04 -0400
commitfaea2c5311e162f5ceda8e0a261a9f9ece6f921d (patch)
tree20d2aac1037c83c46e62e6d6bca4393a019780f6
parent0ce187c4f32d77eae077f249aa10656b5eef5f28 (diff)
downloadlinux-faea2c5311e162f5ceda8e0a261a9f9ece6f921d.tar.bz2
nilfs2: use inode_set_flags() in nilfs_set_inode_flags()
Use inode_set_flags() 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 flags to avoid a race where an immutable file has the immutable flag cleared for a brief window of time. This is a similar fix to commit 5f16f3225b06 ("ext4: atomically set inode->i_flags in ext4_set_inode_flags()"). Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> Cc: "Theodore Ts'o" <tytso@mit.edu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--fs/nilfs2/inode.c15
1 files changed, 8 insertions, 7 deletions
diff --git a/fs/nilfs2/inode.c b/fs/nilfs2/inode.c
index 8138b1176867..766cb85fe2f1 100644
--- a/fs/nilfs2/inode.c
+++ b/fs/nilfs2/inode.c
@@ -443,19 +443,20 @@ struct inode *nilfs_new_inode(struct inode *dir, umode_t mode)
void nilfs_set_inode_flags(struct inode *inode)
{
unsigned int flags = NILFS_I(inode)->i_flags;
+ unsigned int new_fl = 0;
- inode->i_flags &= ~(S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME |
- S_DIRSYNC);
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;
+ inode_set_flags(inode, new_fl, S_SYNC | S_APPEND | S_IMMUTABLE |
+ S_NOATIME | S_DIRSYNC);
}
int nilfs_read_inode_common(struct inode *inode,