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Btrfs: fix send to deal with sparse files properly

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Send was just sending everything it found, even if the extent was a hole.  This
is unpleasant for users, so just skip holes when we are sending.  This will also
skip sending prealloc extents since the send spec doesn't have a prealloc
command.  Eventually we will add a prealloc command and rev the send version so
we can send down the prealloc info.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
This commit is contained in:
Josef Bacik 2013-08-20 15:55:39 -04:00 committed by Chris Mason
parent bdab49d760
commit 57cfd46270
1 changed files with 31 additions and 3 deletions
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34
fs/btrfs/send.c
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@ -3920,7 +3920,8 @@ static int is_extent_unchanged(struct send_ctx *sctx,
btrfs_item_key_to_cpu(eb, &found_key, slot);
if (found_key.objectid != key.objectid ||
found_key.type != key.type) {
ret = 0;
/* If we're a hole then just pretend nothing changed */
ret = (left_disknr) ? 0 : 1;
goto out;
}
@ -3946,7 +3947,8 @@ static int is_extent_unchanged(struct send_ctx *sctx,
* This may only happen on the first iteration.
*/
if (found_key.offset + right_len <= ekey->offset) {
ret = 0;
/* If we're a hole just pretend nothing changed */
ret = (left_disknr) ? 0 : 1;
goto out;
}
@ -4011,8 +4013,8 @@ static int process_extent(struct send_ctx *sctx,
struct btrfs_path *path,
struct btrfs_key *key)
{
int ret = 0;
struct clone_root *found_clone = NULL;
int ret = 0;
if (S_ISLNK(sctx->cur_inode_mode))
return 0;
@ -4025,6 +4027,32 @@ static int process_extent(struct send_ctx *sctx,
ret = 0;
goto out;
}
} else {
struct btrfs_file_extent_item *ei;
u8 type;
ei = btrfs_item_ptr(path->nodes[0], path->slots[0],
struct btrfs_file_extent_item);
type = btrfs_file_extent_type(path->nodes[0], ei);
if (type == BTRFS_FILE_EXTENT_PREALLOC ||
type == BTRFS_FILE_EXTENT_REG) {
/*
* The send spec does not have a prealloc command yet,
* so just leave a hole for prealloc'ed extents until
* we have enough commands queued up to justify rev'ing
* the send spec.
*/
if (type == BTRFS_FILE_EXTENT_PREALLOC) {
ret = 0;
goto out;
}
/* Have a hole, just skip it. */
if (btrfs_file_extent_disk_bytenr(path->nodes[0], ei) == 0) {
ret = 0;
goto out;
}
}
}
ret = find_extent_clone(sctx, path, key->objectid, key->offset,