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btrfs: send: update comment at find_extent_clone()

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We have this unclear comment at find_extent_clone() about extents starting
at a file offset greater than or equals to the i_size of the inode. It's
not really informative and it's misleading, since it mentions the author
found such extents with snapshots and large files.

Such extents are a result of fallocate with FALLOC_FL_KEEP_SIZE and there
is no relation to snapshots or large files (all write paths update the
i_size before inserting a new file extent item). So update the comment to
be precise about it and why we don't bother looking for clone sources in
that case.

Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Filipe Manana
2022-11-01 16:15:42 +00:00
committed by David Sterba
parent 61ce908a3c
commit d3f41317f0
1 changed files with 7 additions and 7 deletions
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14
fs/btrfs/send.c
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@@ -1365,14 +1365,14 @@ static int find_extent_clone(struct send_ctx *sctx,
int compressed; int compressed;
u32 i; u32 i;
if (data_offset >= ino_size) { /*
/* * With fallocate we can get prealloc extents beyond the inode's i_size,
* There may be extents that lie behind the file's size. * so we don't do anything here because clone operations can not clone
* I at least had this in combination with snapshotting while * to a range beyond i_size without increasing the i_size of the
* writing large files. * destination inode.
*/ */
if (data_offset >= ino_size)
return 0; return 0;
}
fi = btrfs_item_ptr(eb, path->slots[0], struct btrfs_file_extent_item); fi = btrfs_item_ptr(eb, path->slots[0], struct btrfs_file_extent_item);
extent_type = btrfs_file_extent_type(eb, fi); extent_type = btrfs_file_extent_type(eb, fi);