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btrfs: subpage: make btrfs_alloc_subpage() return btrfs_subpage directly

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The existing calling convention of btrfs_alloc_subpage() is pretty
awful.  Change it to a more common pattern by returning struct
btrfs_subpage directly and let the caller to determine if the call
succeeded.

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>
This commit is contained in:
Qu Wenruo
2021-08-17 17:38:50 +08:00
committed by David Sterba
parent fdf250db89
commit 651fb41927
3 changed files with 24 additions and 22 deletions
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6
fs/btrfs/extent_io.c
View File

@@ -6138,9 +6138,9 @@ struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
* support, so we still preallocate the memory in the loop. * support, so we still preallocate the memory in the loop.
*/ */
if (fs_info->sectorsize < PAGE_SIZE) { if (fs_info->sectorsize < PAGE_SIZE) {
ret = btrfs_alloc_subpage(fs_info, &prealloc, prealloc = btrfs_alloc_subpage(fs_info, BTRFS_SUBPAGE_METADATA);
BTRFS_SUBPAGE_METADATA); if (IS_ERR(prealloc)) {
if (ret < 0) { ret = PTR_ERR(prealloc);
unlock_page(p); unlock_page(p);
put_page(p); put_page(p);
exists = ERR_PTR(ret); exists = ERR_PTR(ret);

33
fs/btrfs/subpage.c
View File

@@ -66,8 +66,7 @@
int btrfs_attach_subpage(const struct btrfs_fs_info *fs_info, int btrfs_attach_subpage(const struct btrfs_fs_info *fs_info,
struct page *page, enum btrfs_subpage_type type) struct page *page, enum btrfs_subpage_type type)
{ {
struct btrfs_subpage *subpage = NULL; struct btrfs_subpage *subpage;
int ret;
/* /*
* We have cases like a dummy extent buffer page, which is not mappped * We have cases like a dummy extent buffer page, which is not mappped
@@ -75,13 +74,15 @@ int btrfs_attach_subpage(const struct btrfs_fs_info *fs_info,
*/ */
if (page->mapping) if (page->mapping)
ASSERT(PageLocked(page)); ASSERT(PageLocked(page));
/* Either not subpage, or the page already has private attached */ /* Either not subpage, or the page already has private attached */
if (fs_info->sectorsize == PAGE_SIZE || PagePrivate(page)) if (fs_info->sectorsize == PAGE_SIZE || PagePrivate(page))
return 0; return 0;
ret = btrfs_alloc_subpage(fs_info, &subpage, type); subpage = btrfs_alloc_subpage(fs_info, type);
if (ret < 0) if (IS_ERR(subpage))
return ret; return PTR_ERR(subpage);
attach_page_private(page, subpage); attach_page_private(page, subpage);
return 0; return 0;
} }
@@ -100,23 +101,25 @@ void btrfs_detach_subpage(const struct btrfs_fs_info *fs_info,
btrfs_free_subpage(subpage); btrfs_free_subpage(subpage);
} }
int btrfs_alloc_subpage(const struct btrfs_fs_info *fs_info, struct btrfs_subpage *btrfs_alloc_subpage(const struct btrfs_fs_info *fs_info,
struct btrfs_subpage **ret,
enum btrfs_subpage_type type) enum btrfs_subpage_type type)
{ {
struct btrfs_subpage *ret;
ASSERT(fs_info->sectorsize < PAGE_SIZE); ASSERT(fs_info->sectorsize < PAGE_SIZE);
*ret = kzalloc(sizeof(struct btrfs_subpage), GFP_NOFS); ret = kzalloc(sizeof(struct btrfs_subpage), GFP_NOFS);
if (!*ret) if (!ret)
return -ENOMEM; return ERR_PTR(-ENOMEM);
spin_lock_init(&(*ret)->lock);
spin_lock_init(&ret->lock);
if (type == BTRFS_SUBPAGE_METADATA) { if (type == BTRFS_SUBPAGE_METADATA) {
atomic_set(&(*ret)->eb_refs, 0); atomic_set(&ret->eb_refs, 0);
} else { } else {
atomic_set(&(*ret)->readers, 0); atomic_set(&ret->readers, 0);
atomic_set(&(*ret)->writers, 0); atomic_set(&ret->writers, 0);
} }
return 0; return ret;
} }
void btrfs_free_subpage(struct btrfs_subpage *subpage) void btrfs_free_subpage(struct btrfs_subpage *subpage)

3
fs/btrfs/subpage.h
View File

@@ -59,8 +59,7 @@ void btrfs_detach_subpage(const struct btrfs_fs_info *fs_info,
struct page *page); struct page *page);
/* Allocate additional data where page represents more than one sector */ /* Allocate additional data where page represents more than one sector */
int btrfs_alloc_subpage(const struct btrfs_fs_info *fs_info, struct btrfs_subpage *btrfs_alloc_subpage(const struct btrfs_fs_info *fs_info,
struct btrfs_subpage **ret,
enum btrfs_subpage_type type); enum btrfs_subpage_type type);
void btrfs_free_subpage(struct btrfs_subpage *subpage); void btrfs_free_subpage(struct btrfs_subpage *subpage);