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f2fs: move mnt_want_write_file after arguments checking 

It's needless of mnt_want_write_file for arguments checking.

Signed-off-by: Kinglong Mee <kinglongmee@gmail.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Kinglong Mee 2017-03-10 17:55:07 +08:00 committed by Jaegeuk Kim
parent 46e82fb1b5
commit d756386172
1 changed files with 21 additions and 29 deletions
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50
fs/f2fs/file.c
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@ -2037,45 +2037,37 @@ static int f2fs_ioc_defragment(struct file *filp, unsigned long arg)
if (!S_ISREG(inode->i_mode))
return -EINVAL;
if (f2fs_readonly(sbi->sb))
return -EROFS;
if (copy_from_user(&range, (struct f2fs_defragment __user *)arg,
sizeof(range)))
return -EFAULT;
/* verify alignment of offset & size */
if (range.start & (F2FS_BLKSIZE - 1) || range.len & (F2FS_BLKSIZE - 1))
return -EINVAL;
if (unlikely((range.start + range.len) >> PAGE_SHIFT >
sbi->max_file_blocks))
return -EINVAL;
err = mnt_want_write_file(filp);
if (err)
return err;
if (f2fs_readonly(sbi->sb)) {
err = -EROFS;
goto out;
}
if (copy_from_user(&range, (struct f2fs_defragment __user *)arg,
sizeof(range))) {
err = -EFAULT;
goto out;
}
/* verify alignment of offset & size */
if (range.start & (F2FS_BLKSIZE - 1) ||
range.len & (F2FS_BLKSIZE - 1)) {
err = -EINVAL;
goto out;
}
if (unlikely((range.start + range.len) >> PAGE_SHIFT >
sbi->max_file_blocks)) {
err = -EINVAL;
goto out;
}
err = f2fs_defragment_range(sbi, filp, &range);
mnt_drop_write_file(filp);
f2fs_update_time(sbi, REQ_TIME);
if (err < 0)
goto out;
return err;
if (copy_to_user((struct f2fs_defragment __user *)arg, &range,
sizeof(range)))
err = -EFAULT;
out:
mnt_drop_write_file(filp);
return err;
return -EFAULT;
return 0;
}
static int f2fs_move_file_range(struct file *file_in, loff_t pos_in,