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| author | Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> | 2008-01-28 23:58:27 -0500 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2008-01-28 23:58:27 -0500 |
| commit | c278bfecebfb1ed67c326ef472660878baa745cd (patch) | |
| tree | 7207594cef5bd04ea7333a8321d78aefee01a540 /fs/ext4/extents.c | |
| parent | 01f4adc04480a4e0395906d0268c056cf09c39c0 (diff) | |
| download | linux-c278bfecebfb1ed67c326ef472660878baa745cd.tar.bz2 | |
ext4: Make ext4_get_blocks_wrap take the truncate_mutex early.
When doing a migrate from ext3 to ext4 inode we need to make sure the test
for inode type and walking inode data happens inside lock. To make this
happen move truncate_mutex early before checking the i_flags.
This actually should enable us to remove the verify_chain().
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Diffstat (limited to 'fs/ext4/extents.c')
| -rw-r--r-- | fs/ext4/extents.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c index 8593e59020fe..ec5019fa552f 100644 --- a/fs/ext4/extents.c +++ b/fs/ext4/extents.c @@ -2129,6 +2129,10 @@ out: return err ? err : allocated; } +/* + * Need to be called with + * mutex_lock(&EXT4_I(inode)->truncate_mutex); + */ int ext4_ext_get_blocks(handle_t *handle, struct inode *inode, ext4_lblk_t iblock, unsigned long max_blocks, struct buffer_head *bh_result, @@ -2144,7 +2148,6 @@ int ext4_ext_get_blocks(handle_t *handle, struct inode *inode, __clear_bit(BH_New, &bh_result->b_state); ext_debug("blocks %u/%lu requested for inode %u\n", iblock, max_blocks, inode->i_ino); - mutex_lock(&EXT4_I(inode)->truncate_mutex); /* check in cache */ goal = ext4_ext_in_cache(inode, iblock, &newex); @@ -2318,8 +2321,6 @@ out2: ext4_ext_drop_refs(path); kfree(path); } - mutex_unlock(&EXT4_I(inode)->truncate_mutex); - return err ? err : allocated; } @@ -2449,6 +2450,7 @@ long ext4_fallocate(struct inode *inode, int mode, loff_t offset, loff_t len) * modify 1 super block, 1 block bitmap and 1 group descriptor. */ credits = EXT4_DATA_TRANS_BLOCKS(inode->i_sb) + 3; + mutex_lock(&EXT4_I(inode)->truncate_mutex) retry: while (ret >= 0 && ret < max_blocks) { block = block + ret; @@ -2505,6 +2507,7 @@ retry: if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries)) goto retry; + mutex_unlock(&EXT4_I(inode)->truncate_mutex) /* * Time to update the file size. * Update only when preallocation was requested beyond the file size. |