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hfsplus: protect setflags using i_mutex

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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>
This commit is contained in:
Christoph Hellwig 2010-10-01 05:41:35 +02:00
parent 94744567fe
commit 6333816ade
1 changed files with 8 additions and 7 deletions
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15
fs/hfsplus/ioctl.c
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@ -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;
}