btrfs: reduce type width of btrfs_io_contexts

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That structure is our ultimate object for all __btrfs_map_block()
related functions.  We have some hard to understand members, like
tgtdev_map, but without any comments.

This patch will improve the situation:

- Add extra comments for num_stripes, mirror_num, num_tgtdevs and
  tgtdev_map[]
  Especially for the last two members, add a dedicated (thus very long)
  comments for them, with example to explain it.

- Shrink those int members to u16.
  In fact our on-disk format is only using u16 for num_stripes, thus
  no need to use int at all.

Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

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This commit is contained in:

Qu Wenruo 2023-02-07 12:26:13 +08:00 • committed by David Sterba

parent be5c7edbfd

commit 4ced85f81a

2 changed files with 58 additions and 12 deletions

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16

fs/btrfs/volumes.c

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54

fs/btrfs/volumes.h

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