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fat: Push mnt_want_write() outside of i_mutex 

When mnt_want_write() starts to handle freezing it will get a full lock
semantics requiring proper lock ordering. So push mnt_want_write() call
outside of i_mutex as in other places.

CC: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Jan Kara 2012-06-12 16:20:31 +02:00 committed by Al Viro
parent c30dabfe5d
commit e24f17da35
1 changed files with 7 additions and 8 deletions
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15
fs/fat/file.c
View File

@ -43,10 +43,10 @@ static int fat_ioctl_set_attributes(struct file *file, u32 __user *user_attr)
if (err)
goto out;
mutex_lock(&inode->i_mutex);
err = mnt_want_write_file(file);
if (err)
goto out_unlock_inode;
goto out;
mutex_lock(&inode->i_mutex);
/*
* ATTR_VOLUME and ATTR_DIR cannot be changed; this also
@ -73,14 +73,14 @@ static int fat_ioctl_set_attributes(struct file *file, u32 __user *user_attr)
/* The root directory has no attributes */
if (inode->i_ino == MSDOS_ROOT_INO && attr != ATTR_DIR) {
err = -EINVAL;
goto out_drop_write;
goto out_unlock_inode;
}
if (sbi->options.sys_immutable &&
((attr | oldattr) & ATTR_SYS) &&
!capable(CAP_LINUX_IMMUTABLE)) {
err = -EPERM;
goto out_drop_write;
goto out_unlock_inode;
}
/*
@ -90,12 +90,12 @@ static int fat_ioctl_set_attributes(struct file *file, u32 __user *user_attr)
*/
err = security_inode_setattr(file->f_path.dentry, &ia);
if (err)
goto out_drop_write;
goto out_unlock_inode;
/* This MUST be done before doing anything irreversible... */
err = fat_setattr(file->f_path.dentry, &ia);
if (err)
goto out_drop_write;
goto out_unlock_inode;
fsnotify_change(file->f_path.dentry, ia.ia_valid);
if (sbi->options.sys_immutable) {
@ -107,10 +107,9 @@ static int fat_ioctl_set_attributes(struct file *file, u32 __user *user_attr)
fat_save_attrs(inode, attr);
mark_inode_dirty(inode);
out_drop_write:
mnt_drop_write_file(file);
out_unlock_inode:
mutex_unlock(&inode->i_mutex);
mnt_drop_write_file(file);
out:
return err;
}