From 786ec7915e530936b9eb2e3d12274145cab7aa7d Mon Sep 17 00:00:00 2001 From: Theodore Ts'o Date: Mon, 17 May 2010 00:00:00 -0400 Subject: [PATCH] ext4: Clear the EXT4_EOFBLOCKS_FL flag only when warranted Dimitry Monakhov discovered an edge case where it was possible for the EXT4_EOFBLOCKS_FL flag could get cleared unnecessarily. This is true; I have a test case that can be exercised via downloading and decompressing the file: wget ftp://ftp.kernel.org/pub/linux/kernel/people/tytso/ext4-testcases/eofblocks-fl-test-case.img.bz2 bunzip2 eofblocks-fl-test-case.img dd if=/dev/zero of=eofblocks-fl-test-case.img bs=1k seek=17925 bs=1k count=1 conv=notrunc However, triggering it in real life is highly unlikely since it requires an extremely fragmented sparse file with a hole in exactly the right place in the extent tree. (It actually took quite a bit of work to generate this test case.) Still, it's nice to get even extreme corner cases to be correct, so this patch makes sure that we don't clear the EXT4_EOFBLOCKS_FL incorrectly even in this corner case. Signed-off-by: "Theodore Ts'o" --- fs/ext4/extents.c | 18 +++++++++++++++--- 1 file changed, 15 insertions(+), 3 deletions(-) diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c index e40d2b793f2d..ffcaa1137def 100644 --- a/fs/ext4/extents.c +++ b/fs/ext4/extents.c @@ -3319,7 +3319,7 @@ int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, struct ext4_extent_header *eh; struct ext4_extent newex, *ex, *last_ex; ext4_fsblk_t newblock; - int err = 0, depth, ret, cache_type; + int i, err = 0, depth, ret, cache_type; unsigned int allocated = 0; struct ext4_allocation_request ar; ext4_io_end_t *io = EXT4_I(inode)->cur_aio_dio; @@ -3508,8 +3508,20 @@ int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, goto out2; } last_ex = EXT_LAST_EXTENT(eh); - if (map->m_lblk + ar.len > le32_to_cpu(last_ex->ee_block) - + ext4_ext_get_actual_len(last_ex)) + /* + * If the current leaf block was reached by looking at + * the last index block all the way down the tree, and + * we are extending the inode beyond the last extent + * in the current leaf block, then clear the + * EOFBLOCKS_FL flag. + */ + for (i = depth-1; i >= 0; i--) { + if (path[i].p_idx != EXT_LAST_INDEX(path[i].p_hdr)) + break; + } + if ((i < 0) && + (map->m_lblk + ar.len > le32_to_cpu(last_ex->ee_block) + + ext4_ext_get_actual_len(last_ex))) ext4_clear_inode_flag(inode, EXT4_INODE_EOFBLOCKS); } err = ext4_ext_insert_extent(handle, inode, path, &newex, flags); -- 2.20.1