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authorFrederic Weisbecker <fweisbec@gmail.com>2009-10-14 23:08:43 +0200
committerFrederic Weisbecker <fweisbec@gmail.com>2009-10-14 23:27:57 +0200
commitac78a07893d24d95ff5f39d0433c25210f224f07 (patch)
treeac48d2a828ef6daa62d5f5373cc14ba658b2a945
parent48f6ba5e691948caba2e7bc362153fb28e4f1e09 (diff)
downloadtalos-op-linux-ac78a07893d24d95ff5f39d0433c25210f224f07.tar.gz
talos-op-linux-ac78a07893d24d95ff5f39d0433c25210f224f07.zip
kill-the-bkl/reiserfs: always lock the ioctl path
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>
-rw-r--r--fs/reiserfs/ioctl.c66
1 files changed, 39 insertions, 27 deletions
diff --git a/fs/reiserfs/ioctl.c b/fs/reiserfs/ioctl.c
index 5e40b0cd4c3d..e30e8be09179 100644
--- a/fs/reiserfs/ioctl.c
+++ b/fs/reiserfs/ioctl.c
@@ -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;
}
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