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btrfs: make btrfs_is_subpage() to return false directly for 4K page size

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Btrfs only supports sectorsize 4K, 8K, 16K, 32K, 64K for now, thus for
systems with 4K page size, there is no way the fs is subpage (sectorsize
< PAGE_SIZE).

So here we define btrfs_is_subpage() different according to the
PAGE_SIZE:

- PAGE_SIZE > 4K
  We may hit real subpage cases, define btrfs_is_subpage() as a regular
  function and do the usual checks.

- PAGE_SIZE == 4K (no smaller PAGE_SIZE support AFAIK)
  There is no way the fs is subpage, so just define btrfs_is_subpage()
  as an inline function which always return false.

This saves about 7K bytes for x86_64 debug builds:

	   text	   data	    bss	    dec	    hex	filename
Before:	1484452	 168693	  25776	1678921	 199e49	fs/btrfs/btrfs.ko
After:	1476605	 168445	  25776	1670826	 197eaa	fs/btrfs/btrfs.ko

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 2024-08-05 15:02:54 +09:30 committed by David Sterba
parent 0c749585fc
commit efffb803bf
2 changed files with 11 additions and 0 deletions
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2
fs/btrfs/subpage.c
View File

@ -64,6 +64,7 @@
* This means a slightly higher tree locking latency.
*/
#if PAGE_SIZE > SZ_4K
bool btrfs_is_subpage(const struct btrfs_fs_info *fs_info, struct address_space *mapping)
{
if (fs_info->sectorsize >= PAGE_SIZE)
@ -85,6 +86,7 @@ bool btrfs_is_subpage(const struct btrfs_fs_info *fs_info, struct address_space
return true;
return false;
}
#endif
void btrfs_init_subpage_info(struct btrfs_subpage_info *subpage_info, u32 sectorsize)
{

9
fs/btrfs/subpage.h
View File

@ -5,6 +5,7 @@
#include <linux/spinlock.h>
#include <linux/atomic.h>
#include <linux/sizes.h>
struct address_space;
struct folio;
@ -88,7 +89,15 @@ enum btrfs_subpage_type {
BTRFS_SUBPAGE_DATA,
};
#if PAGE_SIZE > SZ_4K
bool btrfs_is_subpage(const struct btrfs_fs_info *fs_info, struct address_space *mapping);
#else
static inline bool btrfs_is_subpage(const struct btrfs_fs_info *fs_info,
struct address_space *mapping)
{
return false;
}
#endif
void btrfs_init_subpage_info(struct btrfs_subpage_info *subpage_info, u32 sectorsize);
int btrfs_attach_subpage(const struct btrfs_fs_info *fs_info,