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| author | Andi Kleen <ak@suse.de> | 2008-01-27 16:58:51 -0600 |
|---|---|---|
| committer | Dave Kleikamp <shaggy@linux.vnet.ibm.com> | 2008-02-07 13:33:58 -0600 |
| commit | baab81fa518ecfac597402b462631f5593926623 (patch) | |
| tree | de6339ce964d91959a93401117992df409280812 /fs/jfs/ioctl.c | |
| parent | 0afc2edfada50980bec999f94dcea26ebad3dda6 (diff) | |
| download | linux-baab81fa518ecfac597402b462631f5593926623.tar.gz linux-baab81fa518ecfac597402b462631f5593926623.tar.bz2 linux-baab81fa518ecfac597402b462631f5593926623.zip | |
BKL-removal: Use unlocked_ioctl for jfs
Convert jfs_ioctl over to not use the BKL. The only potential race
I could see was with two ioctls in parallel changing the flags
and losing the updates. Use the i_mutex to protect against this.
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Dave Kleikamp <shaggy@linux.vnet.ibm.com>
Diffstat (limited to 'fs/jfs/ioctl.c')
| -rw-r--r-- | fs/jfs/ioctl.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/fs/jfs/ioctl.c b/fs/jfs/ioctl.c index dfda12a073e1..fc82eccf408a 100644 --- a/fs/jfs/ioctl.c +++ b/fs/jfs/ioctl.c @@ -51,9 +51,9 @@ static long jfs_map_ext2(unsigned long flags, int from) } -int jfs_ioctl(struct inode * inode, struct file * filp, unsigned int cmd, - unsigned long arg) +long jfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) { + struct inode *inode = filp->f_dentry->d_inode; struct jfs_inode_info *jfs_inode = JFS_IP(inode); unsigned int flags; @@ -82,6 +82,10 @@ int jfs_ioctl(struct inode * inode, struct file * filp, unsigned int cmd, /* Is it quota file? Do not allow user to mess with it */ if (IS_NOQUOTA(inode)) return -EPERM; + + /* Lock against other parallel changes of flags */ + mutex_lock(&inode->i_mutex); + jfs_get_inode_flags(jfs_inode); oldflags = jfs_inode->mode2; @@ -92,8 +96,10 @@ int jfs_ioctl(struct inode * inode, struct file * filp, unsigned int cmd, if ((oldflags & JFS_IMMUTABLE_FL) || ((flags ^ oldflags) & (JFS_APPEND_FL | JFS_IMMUTABLE_FL))) { - if (!capable(CAP_LINUX_IMMUTABLE)) + if (!capable(CAP_LINUX_IMMUTABLE)) { + mutex_unlock(&inode->i_mutex); return -EPERM; + } } flags = flags & JFS_FL_USER_MODIFIABLE; @@ -101,6 +107,7 @@ int jfs_ioctl(struct inode * inode, struct file * filp, unsigned int cmd, jfs_inode->mode2 = flags; jfs_set_inode_flags(inode); + mutex_unlock(&inode->i_mutex); inode->i_ctime = CURRENT_TIME_SEC; mark_inode_dirty(inode); return 0; |