adulau/aha
1
0
Fork 0
mirror of https://github.com/adulau/aha.git synced 2024-12-28 03:36:19 +00:00
Code Issues Projects Releases Packages Wiki Activity

kill-the-bkl/reiserfs: always lock the ioctl path

Browse source 
Reiserfs uses the ioctl callback for its file operations, which means
that its ioctl path is still locked by the bkl, this was synchronizing
with the rest of the filsystem operations. We have changed that by
locking it with the new reiserfs lock but we do that only from the
compat_ioctl callback.

Fix that by locking reiserfs_ioctl() everytime.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jeff Mahoney <jeffm@suse.com>
Cc: Chris Mason <chris.mason@oracle.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Alexander Beregalov <a.beregalov@gmail.com>
Cc: Laurent Riffard <laurent.riffard@free.fr>
Cc: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Frederic Weisbecker 2009-10-14 23:08:43 +02:00
parent 48f6ba5e69
commit ac78a07893
1 changed files with 39 additions and 27 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

66
fs/reiserfs/ioctl.c
View file

@ -13,44 +13,52 @@
#include <linux/compat.h>
/*
** reiserfs_ioctl - handler for ioctl for inode
** supported commands:
** 1) REISERFS_IOC_UNPACK - try to unpack tail from direct item into indirect
** and prevent packing file (argument arg has to be non-zero)
** 2) REISERFS_IOC_[GS]ETFLAGS, REISERFS_IOC_[GS]ETVERSION
** 3) That's all for a while ...
*/
* reiserfs_ioctl - handler for ioctl for inode
* supported commands:
* 1) REISERFS_IOC_UNPACK - try to unpack tail from direct item into indirect
* and prevent packing file (argument arg has to be non-zero)
* 2) REISERFS_IOC_[GS]ETFLAGS, REISERFS_IOC_[GS]ETVERSION
* 3) That's all for a while ...
*/
int reiserfs_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
unsigned long arg)
{
unsigned int flags;
int err = 0;
reiserfs_write_lock(inode->i_sb);
switch (cmd) {
case REISERFS_IOC_UNPACK:
if (S_ISREG(inode->i_mode)) {
if (arg)
return reiserfs_unpack(inode, filp);
else
return 0;
err = reiserfs_unpack(inode, filp);
} else
return -ENOTTY;
/* following two cases are taken from fs/ext2/ioctl.c by Remy
Card (card@masi.ibp.fr) */
err = -ENOTTY;
break;
/*
* following two cases are taken from fs/ext2/ioctl.c by Remy
* Card (card@masi.ibp.fr)
*/
case REISERFS_IOC_GETFLAGS:
if (!reiserfs_attrs(inode->i_sb))
return -ENOTTY;
if (!reiserfs_attrs(inode->i_sb)) {
err = -ENOTTY;
break;
}
flags = REISERFS_I(inode)->i_attrs;
i_attrs_to_sd_attrs(inode, (__u16 *) & flags);
return put_user(flags, (int __user *)arg);
err = put_user(flags, (int __user *)arg);
break;
case REISERFS_IOC_SETFLAGS:{
if (!reiserfs_attrs(inode->i_sb))
return -ENOTTY;
if (!reiserfs_attrs(inode->i_sb)) {
err = -ENOTTY;
break;
}
err = mnt_want_write(filp->f_path.mnt);
if (err)
return err;
break;
if (!is_owner_or_cap(inode)) {
err = -EPERM;
@ -90,16 +98,18 @@ int reiserfs_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
mark_inode_dirty(inode);
setflags_out:
mnt_drop_write(filp->f_path.mnt);
return err;
break;
}
case REISERFS_IOC_GETVERSION:
return put_user(inode->i_generation, (int __user *)arg);
err = put_user(inode->i_generation, (int __user *)arg);
break;
case REISERFS_IOC_SETVERSION:
if (!is_owner_or_cap(inode))
return -EPERM;
err = -EPERM;
break;
err = mnt_want_write(filp->f_path.mnt);
if (err)
return err;
break;
if (get_user(inode->i_generation, (int __user *)arg)) {
err = -EFAULT;
goto setversion_out;
@ -108,10 +118,14 @@ setflags_out:
mark_inode_dirty(inode);
setversion_out:
mnt_drop_write(filp->f_path.mnt);
return err;
break;
default:
return -ENOTTY;
err = -ENOTTY;
}
reiserfs_write_unlock(inode->i_sb);
return err;
}
#ifdef CONFIG_COMPAT
@ -142,9 +156,7 @@ long reiserfs_compat_ioctl(struct file *file, unsigned int cmd,
return -ENOIOCTLCMD;
}
reiserfs_write_lock(inode->i_sb);
ret = reiserfs_ioctl(inode, file, cmd, (unsigned long) compat_ptr(arg));
reiserfs_write_unlock(inode->i_sb);
return ret;
}