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Message-Id: <20081203185917.95F8B49044@coco.kroah.org>
Date: Wed, 03 Dec 2008 10:55:52 -0800
From: <gregkh@...e.de>
To: aneesh.kumar@...ux.vnet.ibm.com, gregkh@...e.de,
linux-ext4@...r.kernel.org, tytso@....edu
Cc: <stable@...nel.org>, <stable-commits@...r.kernel.org>
Subject: patch ext4-elevate-write-count-for-migrate-ioctl.patch added to 2.6.27-stable tree
This is a note to let you know that we have just queued up the patch titled
Subject: ext4: elevate write count for migrate ioctl
to the 2.6.27-stable tree. Its filename is
ext4-elevate-write-count-for-migrate-ioctl.patch
A git repo of this tree can be found at
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
>From tytso@....edu Wed Dec 3 09:58:51 2008
From: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>
Date: Sun, 16 Nov 2008 11:05:25 -0500
Subject: ext4: elevate write count for migrate ioctl
To: stable@...nel.org
Cc: Ext4 Developers List <linux-ext4@...r.kernel.org>, "Theodore Ts'o" <tytso@....edu>, "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Message-ID: <1226851540-8032-6-git-send-email-tytso@....edu>
From: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>
(cherry picked from commit 2a43a878001cc5cb7c3c7be2e8dad0a1aeb939b0)
The migrate ioctl writes to the filsystem, so we need to elevate the
write count.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@....edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
---
fs/ext4/ext4.h | 3 +--
fs/ext4/ioctl.c | 21 ++++++++++++++++++++-
fs/ext4/migrate.c | 10 +---------
3 files changed, 22 insertions(+), 12 deletions(-)
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -1083,8 +1083,7 @@ extern long ext4_ioctl(struct file *, un
extern long ext4_compat_ioctl (struct file *, unsigned int, unsigned long);
/* migrate.c */
-extern int ext4_ext_migrate(struct inode *, struct file *, unsigned int,
- unsigned long);
+extern int ext4_ext_migrate(struct inode *);
/* namei.c */
extern int ext4_orphan_add(handle_t *, struct inode *);
extern int ext4_orphan_del(handle_t *, struct inode *);
--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c
@@ -267,7 +267,26 @@ setversion_out:
}
case EXT4_IOC_MIGRATE:
- return ext4_ext_migrate(inode, filp, cmd, arg);
+ {
+ int err;
+ if (!is_owner_or_cap(inode))
+ return -EACCES;
+
+ err = mnt_want_write(filp->f_path.mnt);
+ if (err)
+ return err;
+ /*
+ * inode_mutex prevent write and truncate on the file.
+ * Read still goes through. We take i_data_sem in
+ * ext4_ext_swap_inode_data before we switch the
+ * inode format to prevent read.
+ */
+ mutex_lock(&(inode->i_mutex));
+ err = ext4_ext_migrate(inode);
+ mutex_unlock(&(inode->i_mutex));
+ mnt_drop_write(filp->f_path.mnt);
+ return err;
+ }
default:
return -ENOTTY;
--- a/fs/ext4/migrate.c
+++ b/fs/ext4/migrate.c
@@ -447,8 +447,7 @@ static int free_ext_block(handle_t *hand
}
-int ext4_ext_migrate(struct inode *inode, struct file *filp,
- unsigned int cmd, unsigned long arg)
+int ext4_ext_migrate(struct inode *inode)
{
handle_t *handle;
int retval = 0, i;
@@ -516,12 +515,6 @@ int ext4_ext_migrate(struct inode *inode
* when we add extents we extent the journal
*/
/*
- * inode_mutex prevent write and truncate on the file. Read still goes
- * through. We take i_data_sem in ext4_ext_swap_inode_data before we
- * switch the inode format to prevent read.
- */
- mutex_lock(&(inode->i_mutex));
- /*
* Even though we take i_mutex we can still cause block allocation
* via mmap write to holes. If we have allocated new blocks we fail
* migrate. New block allocation will clear EXT4_EXT_MIGRATE flag.
@@ -623,7 +616,6 @@ err_out:
tmp_inode->i_nlink = 0;
ext4_journal_stop(handle);
- mutex_unlock(&(inode->i_mutex));
if (tmp_inode)
iput(tmp_inode);
Patches currently in stable-queue which might be from aneesh.kumar@...ux.vnet.ibm.com are
queue-2.6.27/ext4-elevate-write-count-for-migrate-ioctl.patch
queue-2.6.27/ext4-free-ext4_prealloc_space-using-kmem_cache_free.patch
queue-2.6.27/ext4-do-mballoc-init-before-doing-filesystem-recovery.patch
queue-2.6.27/ext4-convert-to-host-order-before-using-the-values.patch
queue-2.6.27/ext4-mark-the-buffer_heads-as-dirty-and-uptodate-after-prepare_write.patch
--
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