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author | Dmitry Monakhov <dmonakhov@openvz.org> | 2013-03-11 01:01:03 (GMT) |
---|---|---|
committer | Theodore Ts'o <tytso@mit.edu> | 2013-03-11 01:01:03 (GMT) |
commit | 921f266bc6bfe6ebb599c559f10443af314c19ec (patch) | |
tree | 270647b58f430887b9f510693b73c88a157bdb56 /fs/ext4/inode.c | |
parent | bd384364c1185ecb01f3b8242c915ccb5921c60d (diff) | |
download | linux-fsl-qoriq-921f266bc6bfe6ebb599c559f10443af314c19ec.tar.xz |
ext4: add self-testing infrastructure to do a sanity check
This commit adds a self-testing infrastructure like extent tree does to
do a sanity check for extent status tree. After status tree is as a
extent cache, we'd better to make sure that it caches right result.
After applied this commit, we will get a lot of messages when we run
xfstests as below.
...
kernel: ES len assertation failed for inode: 230 retval 1 != map->m_len
3 in ext4_map_blocks (allocation)
...
kernel: ES cache assertation failed for inode: 230 es_cached ex
[974/2/4781/20] != found ex [974/1/4781/1000]
...
kernel: ES insert assertation failed for inode: 635 ex_status
[0/45/21388/w] != es_status [44/1/21432/u]
...
Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org>
Signed-off-by: Zheng Liu <wenqing.lz@taobao.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/inode.c')
-rw-r--r-- | fs/ext4/inode.c | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index 95a0c62..3186a43 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -482,6 +482,58 @@ static pgoff_t ext4_num_dirty_pages(struct inode *inode, pgoff_t idx, return num; } +#ifdef ES_AGGRESSIVE_TEST +static void ext4_map_blocks_es_recheck(handle_t *handle, + struct inode *inode, + struct ext4_map_blocks *es_map, + struct ext4_map_blocks *map, + int flags) +{ + int retval; + + map->m_flags = 0; + /* + * There is a race window that the result is not the same. + * e.g. xfstests #223 when dioread_nolock enables. The reason + * is that we lookup a block mapping in extent status tree with + * out taking i_data_sem. So at the time the unwritten extent + * could be converted. + */ + if (!(flags & EXT4_GET_BLOCKS_NO_LOCK)) + down_read((&EXT4_I(inode)->i_data_sem)); + if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) { + retval = ext4_ext_map_blocks(handle, inode, map, flags & + EXT4_GET_BLOCKS_KEEP_SIZE); + } else { + retval = ext4_ind_map_blocks(handle, inode, map, flags & + EXT4_GET_BLOCKS_KEEP_SIZE); + } + if (!(flags & EXT4_GET_BLOCKS_NO_LOCK)) + up_read((&EXT4_I(inode)->i_data_sem)); + /* + * Clear EXT4_MAP_FROM_CLUSTER and EXT4_MAP_BOUNDARY flag + * because it shouldn't be marked in es_map->m_flags. + */ + map->m_flags &= ~(EXT4_MAP_FROM_CLUSTER | EXT4_MAP_BOUNDARY); + + /* + * We don't check m_len because extent will be collpased in status + * tree. So the m_len might not equal. + */ + if (es_map->m_lblk != map->m_lblk || + es_map->m_flags != map->m_flags || + es_map->m_pblk != map->m_pblk) { + printk("ES cache assertation failed for inode: %lu " + "es_cached ex [%d/%d/%llu/%x] != " + "found ex [%d/%d/%llu/%x] retval %d flags %x\n", + inode->i_ino, es_map->m_lblk, es_map->m_len, + es_map->m_pblk, es_map->m_flags, map->m_lblk, + map->m_len, map->m_pblk, map->m_flags, + retval, flags); + } +} +#endif /* ES_AGGRESSIVE_TEST */ + /* * The ext4_map_blocks() function tries to look up the requested blocks, * and returns if the blocks are already mapped. @@ -509,6 +561,11 @@ int ext4_map_blocks(handle_t *handle, struct inode *inode, { struct extent_status es; int retval; +#ifdef ES_AGGRESSIVE_TEST + struct ext4_map_blocks orig_map; + + memcpy(&orig_map, map, sizeof(*map)); +#endif map->m_flags = 0; ext_debug("ext4_map_blocks(): inode %lu, flag %d, max_blocks %u," @@ -531,6 +588,10 @@ int ext4_map_blocks(handle_t *handle, struct inode *inode, } else { BUG_ON(1); } +#ifdef ES_AGGRESSIVE_TEST + ext4_map_blocks_es_recheck(handle, inode, map, + &orig_map, flags); +#endif goto found; } @@ -551,6 +612,15 @@ int ext4_map_blocks(handle_t *handle, struct inode *inode, int ret; unsigned long long status; +#ifdef ES_AGGRESSIVE_TEST + if (retval != map->m_len) { + printk("ES len assertation failed for inode: %lu " + "retval %d != map->m_len %d " + "in %s (lookup)\n", inode->i_ino, retval, + map->m_len, __func__); + } +#endif + status = map->m_flags & EXT4_MAP_UNWRITTEN ? EXTENT_STATUS_UNWRITTEN : EXTENT_STATUS_WRITTEN; if (!(flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE) && @@ -643,6 +713,15 @@ found: int ret; unsigned long long status; +#ifdef ES_AGGRESSIVE_TEST + if (retval != map->m_len) { + printk("ES len assertation failed for inode: %lu " + "retval %d != map->m_len %d " + "in %s (allocation)\n", inode->i_ino, retval, + map->m_len, __func__); + } +#endif + status = map->m_flags & EXT4_MAP_UNWRITTEN ? EXTENT_STATUS_UNWRITTEN : EXTENT_STATUS_WRITTEN; if (!(flags & EXT4_GET_BLOCKS_DELALLOC_RESERVE) && @@ -1768,6 +1847,11 @@ static int ext4_da_map_blocks(struct inode *inode, sector_t iblock, struct extent_status es; int retval; sector_t invalid_block = ~((sector_t) 0xffff); +#ifdef ES_AGGRESSIVE_TEST + struct ext4_map_blocks orig_map; + + memcpy(&orig_map, map, sizeof(*map)); +#endif if (invalid_block < ext4_blocks_count(EXT4_SB(inode->i_sb)->s_es)) invalid_block = ~0; @@ -1809,6 +1893,9 @@ static int ext4_da_map_blocks(struct inode *inode, sector_t iblock, else BUG_ON(1); +#ifdef ES_AGGRESSIVE_TEST + ext4_map_blocks_es_recheck(NULL, inode, map, &orig_map, 0); +#endif return retval; } @@ -1873,6 +1960,15 @@ add_delayed: int ret; unsigned long long status; +#ifdef ES_AGGRESSIVE_TEST + if (retval != map->m_len) { + printk("ES len assertation failed for inode: %lu " + "retval %d != map->m_len %d " + "in %s (lookup)\n", inode->i_ino, retval, + map->m_len, __func__); + } +#endif + status = map->m_flags & EXT4_MAP_UNWRITTEN ? EXTENT_STATUS_UNWRITTEN : EXTENT_STATUS_WRITTEN; ret = ext4_es_insert_extent(inode, map->m_lblk, map->m_len, |