From: Ryusuke Konishi Date: Thu, 16 Apr 2015 19:46:50 +0000 (-0700) Subject: nilfs2: use inode_set_flags() in nilfs_set_inode_flags() X-Git-Tag: v4.1-rc1~102^2~59 X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=faea2c5311e162f5ceda8e0a261a9f9ece6f921d;p=linux.git 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 Cc: "Theodore Ts'o" Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- 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,