From baab81fa518ecfac597402b462631f5593926623 Mon Sep 17 00:00:00 2001 From: Andi Kleen Date: Sun, 27 Jan 2008 16:58:51 -0600 Subject: [PATCH 1/2] 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 Signed-off-by: Dave Kleikamp --- 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(-) diff --git a/fs/jfs/file.c b/fs/jfs/file.c index 87eb93694af7..713ff4c2f807 100644 --- a/fs/jfs/file.c +++ b/fs/jfs/file.c @@ -112,5 +112,5 @@ const struct file_operations jfs_file_operations = { .splice_write = generic_file_splice_write, .fsync = jfs_fsync, .release = jfs_release, - .ioctl = jfs_ioctl, + .unlocked_ioctl = jfs_ioctl, }; 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; diff --git a/fs/jfs/jfs_inode.h b/fs/jfs/jfs_inode.h index 95a6a11425e5..570fd5e3ef61 100644 --- a/fs/jfs/jfs_inode.h +++ b/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 struct inode *jfs_iget(struct super_block *, unsigned long); extern int jfs_commit_inode(struct inode *, int); extern int jfs_write_inode(struct inode*, int); diff --git a/fs/jfs/namei.c b/fs/jfs/namei.c index 403cfc24c6fe..6440904a051c 100644 --- a/fs/jfs/namei.c +++ b/fs/jfs/namei.c @@ -1556,7 +1556,7 @@ const struct file_operations jfs_dir_operations = { .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) From ef1fc2f01e02951a0d8520ec3aa0b38606d74b55 Mon Sep 17 00:00:00 2001 From: Andi Kleen Date: Sun, 27 Jan 2008 17:02:02 -0600 Subject: [PATCH 2/2] BKL-removal: Implement a compat_ioctl handler for JFS The ioctls were already compatible except for the actual values so this was fairly easy to do. Signed-off-by: Andi Kleen Signed-off-by: Dave Kleikamp --- fs/jfs/file.c | 3 +++ fs/jfs/ioctl.c | 18 ++++++++++++++++++ fs/jfs/jfs_dinode.h | 2 ++ fs/jfs/jfs_inode.h | 1 + fs/jfs/namei.c | 3 +++ 5 files changed, 27 insertions(+) diff --git a/fs/jfs/file.c b/fs/jfs/file.c index 713ff4c2f807..7f6063acaa3b 100644 --- a/fs/jfs/file.c +++ b/fs/jfs/file.c @@ -113,4 +113,7 @@ const struct file_operations jfs_file_operations = { .fsync = jfs_fsync, .release = jfs_release, .unlocked_ioctl = jfs_ioctl, +#ifdef CONFIG_COMPAT + .compat_ioctl = jfs_compat_ioctl, +#endif }; diff --git a/fs/jfs/ioctl.c b/fs/jfs/ioctl.c index fc82eccf408a..a1f8e375ad21 100644 --- a/fs/jfs/ioctl.c +++ b/fs/jfs/ioctl.c @@ -117,3 +117,21 @@ long jfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) } } +#ifdef CONFIG_COMPAT +long jfs_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) +{ + /* While these ioctl numbers defined with 'long' and have different + * numbers than the 64bit ABI, + * the actual implementation only deals with ints and is compatible. + */ + switch (cmd) { + case JFS_IOC_GETFLAGS32: + cmd = JFS_IOC_GETFLAGS; + break; + case JFS_IOC_SETFLAGS32: + cmd = JFS_IOC_SETFLAGS; + break; + } + return jfs_ioctl(filp, cmd, arg); +} +#endif diff --git a/fs/jfs/jfs_dinode.h b/fs/jfs/jfs_dinode.h index c387540d3425..395c4c0d0f06 100644 --- a/fs/jfs/jfs_dinode.h +++ b/fs/jfs/jfs_dinode.h @@ -170,5 +170,7 @@ struct dinode { #define JFS_IOC_GETFLAGS _IOR('f', 1, long) #define JFS_IOC_SETFLAGS _IOW('f', 2, long) +#define JFS_IOC_GETFLAGS32 _IOR('f', 1, int) +#define JFS_IOC_SETFLAGS32 _IOW('f', 2, int) #endif /*_H_JFS_DINODE */ diff --git a/fs/jfs/jfs_inode.h b/fs/jfs/jfs_inode.h index 570fd5e3ef61..adb2fafcc544 100644 --- a/fs/jfs/jfs_inode.h +++ b/fs/jfs/jfs_inode.h @@ -23,6 +23,7 @@ struct fid; extern struct inode *ialloc(struct inode *, umode_t); extern int jfs_fsync(struct file *, struct dentry *, int); extern long jfs_ioctl(struct file *, unsigned int, unsigned long); +extern long jfs_compat_ioctl(struct file *, unsigned int, unsigned long); extern struct inode *jfs_iget(struct super_block *, unsigned long); extern int jfs_commit_inode(struct inode *, int); extern int jfs_write_inode(struct inode*, int); diff --git a/fs/jfs/namei.c b/fs/jfs/namei.c index 6440904a051c..0ba6778edaa2 100644 --- a/fs/jfs/namei.c +++ b/fs/jfs/namei.c @@ -1557,6 +1557,9 @@ const struct file_operations jfs_dir_operations = { .readdir = jfs_readdir, .fsync = jfs_fsync, .unlocked_ioctl = jfs_ioctl, +#ifdef CONFIG_COMPAT + .compat_ioctl = jfs_compat_ioctl, +#endif }; static int jfs_ci_hash(struct dentry *dir, struct qstr *this)