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| author | Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> | 2009-12-29 23:39:06 -0500 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2009-12-29 23:39:06 -0500 |
| commit | 515f41c33a9d44a964264c9511ad2c869af1fac3 (patch) | |
| tree | bd1790a9787ec171168a87268d3218122e087f2e | |
| parent | 2faf2e19dd0e060eeb32442858ef495ac3083277 (diff) | |
| download | op-kernel-dev-515f41c33a9d44a964264c9511ad2c869af1fac3.zip op-kernel-dev-515f41c33a9d44a964264c9511ad2c869af1fac3.tar.gz | |
ext4: Ensure zeroout blocks have no dirty metadata
This fixes a bug (found by Curt Wohlgemuth) in which new blocks
returned from an extent created with ext4_ext_zeroout() can have dirty
metadata still associated with them.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Curt Wohlgemuth <curtw@google.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
| -rw-r--r-- | fs/ext4/extents.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c index 8fd6c56..91ae460 100644 --- a/fs/ext4/extents.c +++ b/fs/ext4/extents.c @@ -3023,6 +3023,14 @@ out: return err; } +static void unmap_underlying_metadata_blocks(struct block_device *bdev, + sector_t block, int count) +{ + int i; + for (i = 0; i < count; i++) + unmap_underlying_metadata(bdev, block + i); +} + static int ext4_ext_handle_uninitialized_extents(handle_t *handle, struct inode *inode, ext4_lblk_t iblock, unsigned int max_blocks, @@ -3098,6 +3106,18 @@ out: } else allocated = ret; set_buffer_new(bh_result); + /* + * if we allocated more blocks than requested + * we need to make sure we unmap the extra block + * allocated. The actual needed block will get + * unmapped later when we find the buffer_head marked + * new. + */ + if (allocated > max_blocks) { + unmap_underlying_metadata_blocks(inode->i_sb->s_bdev, + newblock + max_blocks, + allocated - max_blocks); + } map_out: set_buffer_mapped(bh_result); out1: |
