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| author | Qu Wenruo <wqu@suse.com> | 2021-08-17 12:38:49 +0300 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2021-10-25 22:17:16 +0300 |
| commit | fdf250db89b65167891a73327f8cd4f58a323612 (patch) | |
| tree | c394000630daf9ae83589d38b4d59457a9d9e01d /fs | |
| parent | 9675ea8c9d0e397b9db723cd37dc5873e597cab2 (diff) | |
| download | linux-fdf250db89b65167891a73327f8cd4f58a323612.tar.xz | |
btrfs: subpage: only call btrfs_alloc_subpage() when sectorsize is smaller than PAGE_SIZE
There are two call sites of btrfs_alloc_subpage():
- btrfs_attach_subpage()
We have ensured sectorsize is smaller than PAGE_SIZE
- alloc_extent_buffer()
We call btrfs_alloc_subpage() unconditionally.
The alloc_extent_buffer() forces us to check the sectorsize size against
page size inside btrfs_alloc_subpage().
Since the function name, btrfs_alloc_subpage(), already indicates it
should only get called for subpage cases, do the check in
alloc_extent_buffer() and add an ASSERT() in btrfs_alloc_subpage().
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/btrfs/extent_io.c | 16 | ||||
| -rw-r--r-- | fs/btrfs/subpage.c | 3 |
2 files changed, 10 insertions, 9 deletions
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index aaddd7225348..19889dbfcf15 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -6137,13 +6137,15 @@ struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info, * page, but it may change in the future for 16K page size * support, so we still preallocate the memory in the loop. */ - ret = btrfs_alloc_subpage(fs_info, &prealloc, - BTRFS_SUBPAGE_METADATA); - if (ret < 0) { - unlock_page(p); - put_page(p); - exists = ERR_PTR(ret); - goto free_eb; + if (fs_info->sectorsize < PAGE_SIZE) { + ret = btrfs_alloc_subpage(fs_info, &prealloc, + BTRFS_SUBPAGE_METADATA); + if (ret < 0) { + unlock_page(p); + put_page(p); + exists = ERR_PTR(ret); + goto free_eb; + } } spin_lock(&mapping->private_lock); diff --git a/fs/btrfs/subpage.c b/fs/btrfs/subpage.c index cb10e56ee31e..ff1c6ba34a4d 100644 --- a/fs/btrfs/subpage.c +++ b/fs/btrfs/subpage.c @@ -104,8 +104,7 @@ int btrfs_alloc_subpage(const struct btrfs_fs_info *fs_info, struct btrfs_subpage **ret, enum btrfs_subpage_type type) { - if (fs_info->sectorsize == PAGE_SIZE) - return 0; + ASSERT(fs_info->sectorsize < PAGE_SIZE); *ret = kzalloc(sizeof(struct btrfs_subpage), GFP_NOFS); if (!*ret) |