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btrfs: send: remove stale code when checking for shared extents

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After commit 040ee6120c ("Btrfs: send, improve clone range") we do not
use anymore the data_offset field of struct backref_ctx, as after that we
do all the necessary checks for the data offset of file extent items at
clone_range(). Since there are no more users of data_offset from that
structure, remove it.

Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Filipe Manana 2021-01-11 11:42:32 +00:00 committed by David Sterba
parent 7056bf69e5
commit 9c4a062a94
1 changed files with 0 additions and 16 deletions
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16
fs/btrfs/send.c
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@ -1191,9 +1191,6 @@ struct backref_ctx {
/* may be truncated in case it's the last extent in a file */
u64 extent_len;
/* data offset in the file extent item */
u64 data_offset;
/* Just to check for bugs in backref resolving */
int found_itself;
};
@ -1401,19 +1398,6 @@ static int find_extent_clone(struct send_ctx *sctx,
backref_ctx->cur_offset = data_offset;
backref_ctx->found_itself = 0;
backref_ctx->extent_len = num_bytes;
/*
* For non-compressed extents iterate_extent_inodes() gives us extent
* offsets that already take into account the data offset, but not for
* compressed extents, since the offset is logical and not relative to
* the physical extent locations. We must take this into account to
* avoid sending clone offsets that go beyond the source file's size,
* which would result in the clone ioctl failing with -EINVAL on the
* receiving end.
*/
if (compressed == BTRFS_COMPRESS_NONE)
backref_ctx->data_offset = 0;
else
backref_ctx->data_offset = btrfs_file_extent_offset(eb, fi);
/*
* The last extent of a file may be too large due to page alignment.