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.
Cc: shaggy@xxxxxxxxxxxxxx
Signed-off-by: Andi Kleen <ak@xxxxxxx>
---
fs/jfs/file.c | 2 +-
fs/jfs/ioctl.c | 13 ++++++++++---
fs/jfs/jfs_inode.h | 3 +--
fs/jfs/namei.c | 2 +-
4 files changed, 13 insertions(+), 7 deletions(-)
Index: linux/fs/jfs/ioctl.c
===================================================================
--- linux.orig/fs/jfs/ioctl.c
+++ linux/fs/jfs/ioctl.c
@@ -51,9 +51,9 @@ static long jfs_map_ext2(unsigned long f
}
-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, stru
/* 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, stru
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, stru
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;
Index: linux/fs/jfs/file.c
===================================================================
--- linux.orig/fs/jfs/file.c
+++ linux/fs/jfs/file.c
@@ -112,5 +112,5 @@ const struct file_operations jfs_file_op
.splice_write = generic_file_splice_write,
.fsync = jfs_fsync,
.release = jfs_release,
- .ioctl = jfs_ioctl,
+ .unlocked_ioctl = jfs_ioctl,
};
Index: linux/fs/jfs/jfs_inode.h
===================================================================
--- linux.orig/fs/jfs/jfs_inode.h
+++ linux/fs/jfs/jfs_inode.h
@@ -22,8 +22,7 @@ struct fid;
extern struct inode *ialloc(struct inode *, umode_t);
extern int jfs_fsync(struct file *, struct dentry *, int);
-extern int jfs_ioctl(struct inode *, struct file *,
- unsigned int, unsigned long);
+extern long jfs_ioctl(struct file *, unsigned int, unsigned long);
extern void jfs_read_inode(struct inode *);
extern int jfs_commit_inode(struct inode *, int);
extern int jfs_write_inode(struct inode*, int);
Index: linux/fs/jfs/namei.c
===================================================================
--- linux.orig/fs/jfs/namei.c
+++ linux/fs/jfs/namei.c
@@ -1562,7 +1562,7 @@ const struct file_operations jfs_dir_ope
.read = generic_read_dir,
.readdir = jfs_readdir,
.fsync = jfs_fsync,
- .ioctl = jfs_ioctl,
+ .unlocked_ioctl = jfs_ioctl,
};
static int jfs_ci_hash(struct dentry *dir, struct qstr *this)
-
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