diff options
Diffstat (limited to 'fs/ext4/extents.c')
| -rw-r--r-- | fs/ext4/extents.c | 46 |
1 files changed, 37 insertions, 9 deletions
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c index 74bc2d549c58..96a1ce159f51 100644 --- a/fs/ext4/extents.c +++ b/fs/ext4/extents.c @@ -74,8 +74,7 @@ static int ext4_extent_block_csum_verify(struct inode *inode, { struct ext4_extent_tail *et; - if (!EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb, - EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) + if (!ext4_has_metadata_csum(inode->i_sb)) return 1; et = find_ext4_extent_tail(eh); @@ -89,8 +88,7 @@ static void ext4_extent_block_csum_set(struct inode *inode, { struct ext4_extent_tail *et; - if (!EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb, - EXT4_FEATURE_RO_COMPAT_METADATA_CSUM)) + if (!ext4_has_metadata_csum(inode->i_sb)) return; et = find_ext4_extent_tail(eh); @@ -2585,6 +2583,27 @@ ext4_ext_rm_leaf(handle_t *handle, struct inode *inode, ex_ee_block = le32_to_cpu(ex->ee_block); ex_ee_len = ext4_ext_get_actual_len(ex); + /* + * If we're starting with an extent other than the last one in the + * node, we need to see if it shares a cluster with the extent to + * the right (towards the end of the file). If its leftmost cluster + * is this extent's rightmost cluster and it is not cluster aligned, + * we'll mark it as a partial that is not to be deallocated. + */ + + if (ex != EXT_LAST_EXTENT(eh)) { + ext4_fsblk_t current_pblk, right_pblk; + long long current_cluster, right_cluster; + + current_pblk = ext4_ext_pblock(ex) + ex_ee_len - 1; + current_cluster = (long long)EXT4_B2C(sbi, current_pblk); + right_pblk = ext4_ext_pblock(ex + 1); + right_cluster = (long long)EXT4_B2C(sbi, right_pblk); + if (current_cluster == right_cluster && + EXT4_PBLK_COFF(sbi, right_pblk)) + *partial_cluster = -right_cluster; + } + trace_ext4_ext_rm_leaf(inode, start, ex, *partial_cluster); while (ex >= EXT_FIRST_EXTENT(eh) && @@ -2710,10 +2729,15 @@ ext4_ext_rm_leaf(handle_t *handle, struct inode *inode, err = ext4_ext_correct_indexes(handle, inode, path); /* - * Free the partial cluster only if the current extent does not - * reference it. Otherwise we might free used cluster. + * If there's a partial cluster and at least one extent remains in + * the leaf, free the partial cluster if it isn't shared with the + * current extent. If there's a partial cluster and no extents + * remain in the leaf, it can't be freed here. It can only be + * freed when it's possible to determine if it's not shared with + * any other extent - when the next leaf is processed or when space + * removal is complete. */ - if (*partial_cluster > 0 && + if (*partial_cluster > 0 && eh->eh_entries && (EXT4_B2C(sbi, ext4_ext_pblock(ex) + ex_ee_len - 1) != *partial_cluster)) { int flags = get_default_free_blocks_flags(inode); @@ -4128,7 +4152,7 @@ int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, struct ext4_extent newex, *ex, *ex2; struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); ext4_fsblk_t newblock = 0; - int free_on_err = 0, err = 0, depth; + int free_on_err = 0, err = 0, depth, ret; unsigned int allocated = 0, offset = 0; unsigned int allocated_clusters = 0; struct ext4_allocation_request ar; @@ -4189,9 +4213,13 @@ int ext4_ext_map_blocks(handle_t *handle, struct inode *inode, if (!ext4_ext_is_uninitialized(ex)) goto out; - allocated = ext4_ext_handle_uninitialized_extents( + ret = ext4_ext_handle_uninitialized_extents( handle, inode, map, path, flags, allocated, newblock); + if (ret < 0) + err = ret; + else + allocated = ret; goto out3; } } |