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authorAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>2008-09-13 12:52:26 -0400
committerTheodore Ts'o <tytso@mit.edu>2008-09-13 12:52:26 -0400
commit2a43a878001cc5cb7c3c7be2e8dad0a1aeb939b0 (patch)
treea0653e45baefbbe3d4de74087525d1b86292a101 /fs/ext4
parent7ee1ec4ca30c6df8e989615cdaacb75f2af4fa6b (diff)
ext4: elevate write count for migrate ioctl
The migrate ioctl writes to the filsystem, so we need to elevate the write count. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/ext4')
-rw-r--r--fs/ext4/ext4.h3
-rw-r--r--fs/ext4/ioctl.c21
-rw-r--r--fs/ext4/migrate.c10
3 files changed, 22 insertions, 12 deletions
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 3e47b99a763c..9b6ad8f19bc9 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -1084,8 +1084,7 @@ extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
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 *);
diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
index ca09dd1039ec..9f3044ac6994 100644
--- 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;
diff --git a/fs/ext4/migrate.c b/fs/ext4/migrate.c
index 46fc0b5b12ba..f2a9cf498ecd 100644
--- a/fs/ext4/migrate.c
+++ b/fs/ext4/migrate.c
@@ -447,8 +447,7 @@ static int free_ext_block(handle_t *handle, struct inode *inode)
}
-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, struct file *filp,
* 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);