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Merge branch 'for-chris-4.9' of git://git.kernel.org/pub/scm/linux/kernel/git/fdmanana/linux into for-linus-4.9

This commit is contained in:
Chris Mason 2016-10-18 06:51:33 -07:00
parent d9ed71e545 d5e84fd8d0
commit 112a3edf4b
1 changed files with 58 additions and 0 deletions
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58
fs/btrfs/send.c
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@ -5805,6 +5805,64 @@ static int changed_extent(struct send_ctx *sctx,
int ret = 0;
if (sctx->cur_ino != sctx->cmp_key->objectid) {
if (result == BTRFS_COMPARE_TREE_CHANGED) {
struct extent_buffer *leaf_l;
struct extent_buffer *leaf_r;
struct btrfs_file_extent_item *ei_l;
struct btrfs_file_extent_item *ei_r;
leaf_l = sctx->left_path->nodes[0];
leaf_r = sctx->right_path->nodes[0];
ei_l = btrfs_item_ptr(leaf_l,
sctx->left_path->slots[0],
struct btrfs_file_extent_item);
ei_r = btrfs_item_ptr(leaf_r,
sctx->right_path->slots[0],
struct btrfs_file_extent_item);
/*
* We may have found an extent item that has changed
* only its disk_bytenr field and the corresponding
* inode item was not updated. This case happens due to
* very specific timings during relocation when a leaf
* that contains file extent items is COWed while
* relocation is ongoing and its in the stage where it
* updates data pointers. So when this happens we can
* safely ignore it since we know it's the same extent,
* but just at different logical and physical locations
* (when an extent is fully replaced with a new one, we
* know the generation number must have changed too,
* since snapshot creation implies committing the current
* transaction, and the inode item must have been updated
* as well).
* This replacement of the disk_bytenr happens at
* relocation.c:replace_file_extents() through
* relocation.c:btrfs_reloc_cow_block().
*/
if (btrfs_file_extent_generation(leaf_l, ei_l) ==
btrfs_file_extent_generation(leaf_r, ei_r) &&
btrfs_file_extent_ram_bytes(leaf_l, ei_l) ==
btrfs_file_extent_ram_bytes(leaf_r, ei_r) &&
btrfs_file_extent_compression(leaf_l, ei_l) ==
btrfs_file_extent_compression(leaf_r, ei_r) &&
btrfs_file_extent_encryption(leaf_l, ei_l) ==
btrfs_file_extent_encryption(leaf_r, ei_r) &&
btrfs_file_extent_other_encoding(leaf_l, ei_l) ==
btrfs_file_extent_other_encoding(leaf_r, ei_r) &&
btrfs_file_extent_type(leaf_l, ei_l) ==
btrfs_file_extent_type(leaf_r, ei_r) &&
btrfs_file_extent_disk_bytenr(leaf_l, ei_l) !=
btrfs_file_extent_disk_bytenr(leaf_r, ei_r) &&
btrfs_file_extent_disk_num_bytes(leaf_l, ei_l) ==
btrfs_file_extent_disk_num_bytes(leaf_r, ei_r) &&
btrfs_file_extent_offset(leaf_l, ei_l) ==
btrfs_file_extent_offset(leaf_r, ei_r) &&
btrfs_file_extent_num_bytes(leaf_l, ei_l) ==
btrfs_file_extent_num_bytes(leaf_r, ei_r))
return 0;
}
inconsistent_snapshot_error(sctx, result, "extent");
return -EIO;
}