From 8cbe63802ddac6b242e4a4293fc338fa7808272c Mon Sep 17 00:00:00 2001 From: Forrest Liu Date: Mon, 17 Dec 2012 09:55:39 -0500 Subject: [PATCH] ext4: fix extent tree corruption caused by hole punch commit c36575e663e302dbaa4d16b9c72d2c9a913a9aef upstream. When depth of extent tree is greater than 1, logical start value of interior node is not correctly updated in ext4_ext_rm_idx. Signed-off-by: Forrest Liu Signed-off-by: "Theodore Ts'o" Reviewed-by: Ashish Sangwan Signed-off-by: Greg Kroah-Hartman --- fs/ext4/extents.c | 22 ++++++++++++++++++---- 1 file changed, 18 insertions(+), 4 deletions(-) diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c index 611647b28a4d..680df5dd0c54 100644 --- a/fs/ext4/extents.c +++ b/fs/ext4/extents.c @@ -2140,13 +2140,14 @@ ext4_ext_in_cache(struct inode *inode, ext4_lblk_t block, * last index in the block only. */ static int ext4_ext_rm_idx(handle_t *handle, struct inode *inode, - struct ext4_ext_path *path) + struct ext4_ext_path *path, int depth) { int err; ext4_fsblk_t leaf; /* free index block */ - path--; + depth--; + path = path + depth; leaf = ext4_idx_pblock(path->p_idx); if (unlikely(path->p_hdr->eh_entries == 0)) { EXT4_ERROR_INODE(inode, "path->p_hdr->eh_entries == 0"); @@ -2162,6 +2163,19 @@ static int ext4_ext_rm_idx(handle_t *handle, struct inode *inode, ext_debug("index is empty, remove it, free block %llu\n", leaf); ext4_free_blocks(handle, inode, NULL, leaf, 1, EXT4_FREE_BLOCKS_METADATA | EXT4_FREE_BLOCKS_FORGET); + + while (--depth >= 0) { + if (path->p_idx != EXT_FIRST_INDEX(path->p_hdr)) + break; + path--; + err = ext4_ext_get_access(handle, inode, path); + if (err) + break; + path->p_idx->ei_block = (path+1)->p_idx->ei_block; + err = ext4_ext_dirty(handle, inode, path); + if (err) + break; + } return err; } @@ -2509,7 +2523,7 @@ ext4_ext_rm_leaf(handle_t *handle, struct inode *inode, /* if this leaf is free, then we should * remove it from index block above */ if (err == 0 && eh->eh_entries == 0 && path[depth].p_bh != NULL) - err = ext4_ext_rm_idx(handle, inode, path + depth); + err = ext4_ext_rm_idx(handle, inode, path, depth); out: return err; @@ -2639,7 +2653,7 @@ again: /* index is empty, remove it; * handle must be already prepared by the * truncatei_leaf() */ - err = ext4_ext_rm_idx(handle, inode, path + i); + err = ext4_ext_rm_idx(handle, inode, path, i); } /* root level has p_bh == NULL, brelse() eats this */ brelse(path[i].p_bh); -- 2.34.1