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| author | Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> | 2015-04-16 12:46:50 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-04-17 09:04:04 -0400 |
| commit | faea2c5311e162f5ceda8e0a261a9f9ece6f921d (patch) | |
| tree | 20d2aac1037c83c46e62e6d6bca4393a019780f6 | |
| parent | 0ce187c4f32d77eae077f249aa10656b5eef5f28 (diff) | |
| download | linux-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.c | 15 |
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, |