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| author | Christoph Hellwig <hch@lst.de> | 2010-10-01 05:41:35 +0200 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2010-10-01 05:41:35 +0200 |
| commit | 6333816ade7e04a96ec0a34a8378c455e4f7c4dd (patch) | |
| tree | bd6f3fc3d929b44cffea4319f6bda828b6704269 | |
| parent | 94744567fef9602c3d8218a1d8f58c04cce354f6 (diff) | |
| download | kernel_samsung_smdk4412-6333816ade7e04a96ec0a34a8378c455e4f7c4dd.zip kernel_samsung_smdk4412-6333816ade7e04a96ec0a34a8378c455e4f7c4dd.tar.gz kernel_samsung_smdk4412-6333816ade7e04a96ec0a34a8378c455e4f7c4dd.tar.bz2 | |
hfsplus: protect setflags using i_mutex
Use i_mutex for protecting against concurrent setflags ioctls like in
other filesystems and get rid of the BKL in hfsplus_ioctl.
Signed-off-by: Christoph Hellwig <hch@tuxera.com>
| -rw-r--r-- | fs/hfsplus/ioctl.c | 15 |
1 files changed, 8 insertions, 7 deletions
diff --git a/fs/hfsplus/ioctl.c b/fs/hfsplus/ioctl.c index 0e359c3..906bd3d 100644 --- a/fs/hfsplus/ioctl.c +++ b/fs/hfsplus/ioctl.c @@ -17,7 +17,6 @@ #include <linux/mount.h> #include <linux/sched.h> #include <linux/xattr.h> -#include <linux/smp_lock.h> #include <asm/uaccess.h> #include "hfsplus_fs.h" @@ -42,10 +41,9 @@ static int hfsplus_ioctl_setflags(struct file *file, int __user *user_flags) unsigned int flags; int err = 0; - lock_kernel(); err = mnt_want_write(file->f_path.mnt); if (err) - goto out_unlock_kernel; + goto out; if (!is_owner_or_cap(inode)) { err = -EACCES; @@ -57,18 +55,20 @@ static int hfsplus_ioctl_setflags(struct file *file, int __user *user_flags) goto out_drop_write; } + mutex_lock(&inode->i_mutex); + if (flags & (FS_IMMUTABLE_FL|FS_APPEND_FL) || HFSPLUS_I(inode).rootflags & (HFSPLUS_FLG_IMMUTABLE|HFSPLUS_FLG_APPEND)) { if (!capable(CAP_LINUX_IMMUTABLE)) { err = -EPERM; - goto out_drop_write; + goto out_unlock_inode; } } /* don't silently ignore unsupported ext2 flags */ if (flags & ~(FS_IMMUTABLE_FL|FS_APPEND_FL|FS_NODUMP_FL)) { err = -EOPNOTSUPP; - goto out_drop_write; + goto out_unlock_inode; } if (flags & FS_IMMUTABLE_FL) { inode->i_flags |= S_IMMUTABLE; @@ -92,10 +92,11 @@ static int hfsplus_ioctl_setflags(struct file *file, int __user *user_flags) inode->i_ctime = CURRENT_TIME_SEC; mark_inode_dirty(inode); +out_unlock_inode: + mutex_lock(&inode->i_mutex); out_drop_write: mnt_drop_write(file->f_path.mnt); -out_unlock_kernel: - unlock_kernel(); +out: return err; } |