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btrfs: embed extent_changeset::range_changed to the structure

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We can embed range_changed to the extent changeset to address following
problems:

- no need to allocate ulist dynamically, we also get rid of the GFP_NOFS
  for free
- fix lack of allocation failure checking in btrfs_qgroup_reserve_data

The stack consuption where extent_changeset is used slightly increases:

before: 16
after: 16 - 8 (for pointer) + 32 (sizeof ulist) = 40

Which is bearable.

Reviewed-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba
2017-02-13 13:42:29 +01:00
parent 9d03793386
commit 53d3235995
3 changed files with 11 additions and 17 deletions
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2
fs/btrfs/extent_io.h
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@@ -193,7 +193,7 @@ struct extent_changeset {
u64 bytes_changed;
/* Changed ranges */
struct ulist *range_changed;
struct ulist range_changed;
};
static inline void extent_set_compress_type(unsigned long *bio_flags,