diff options
Diffstat (limited to 'fs/btrfs')
| -rw-r--r-- | fs/btrfs/ctree.h | 15 | ||||
| -rw-r--r-- | fs/btrfs/struct-funcs.c | 51 |
2 files changed, 55 insertions, 11 deletions
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index 292e21b23217..8e18fb062215 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -1335,17 +1335,10 @@ u##bits btrfs_get_token_##bits(const struct extent_buffer *eb, \ void btrfs_set_token_##bits(struct extent_buffer *eb, const void *ptr, \ unsigned long off, u##bits val, \ struct btrfs_map_token *token); \ -static inline u##bits btrfs_get_##bits(const struct extent_buffer *eb, \ - const void *ptr, \ - unsigned long off) \ -{ \ - return btrfs_get_token_##bits(eb, ptr, off, NULL); \ -} \ -static inline void btrfs_set_##bits(struct extent_buffer *eb, void *ptr,\ - unsigned long off, u##bits val) \ -{ \ - btrfs_set_token_##bits(eb, ptr, off, val, NULL); \ -} +u##bits btrfs_get_##bits(const struct extent_buffer *eb, \ + const void *ptr, unsigned long off); \ +void btrfs_set_##bits(struct extent_buffer *eb, void *ptr, \ + unsigned long off, u##bits val); DECLARE_BTRFS_SETGET_BITS(8) DECLARE_BTRFS_SETGET_BITS(16) diff --git a/fs/btrfs/struct-funcs.c b/fs/btrfs/struct-funcs.c index 4c13b737f568..e63936e4c1e0 100644 --- a/fs/btrfs/struct-funcs.c +++ b/fs/btrfs/struct-funcs.c @@ -33,6 +33,8 @@ static inline void put_unaligned_le8(u8 val, void *p) * * The extent buffer api is used to do the page spanning work required to * have a metadata blocksize different from the page size. + * + * There are 2 variants defined, one with a token pointer and one without. */ #define DEFINE_BTRFS_SETGET_BITS(bits) \ @@ -75,6 +77,31 @@ u##bits btrfs_get_token_##bits(const struct extent_buffer *eb, \ } \ return res; \ } \ +u##bits btrfs_get_##bits(const struct extent_buffer *eb, \ + const void *ptr, unsigned long off) \ +{ \ + unsigned long part_offset = (unsigned long)ptr; \ + unsigned long offset = part_offset + off; \ + void *p; \ + int err; \ + char *kaddr; \ + unsigned long map_start; \ + unsigned long map_len; \ + int size = sizeof(u##bits); \ + u##bits res; \ + \ + err = map_private_extent_buffer(eb, offset, size, \ + &kaddr, &map_start, &map_len); \ + if (err) { \ + __le##bits leres; \ + \ + read_extent_buffer(eb, &leres, offset, size); \ + return le##bits##_to_cpu(leres); \ + } \ + p = kaddr + part_offset - map_start; \ + res = get_unaligned_le##bits(p + off); \ + return res; \ +} \ void btrfs_set_token_##bits(struct extent_buffer *eb, \ const void *ptr, unsigned long off, \ u##bits val, \ @@ -113,6 +140,30 @@ void btrfs_set_token_##bits(struct extent_buffer *eb, \ token->offset = map_start; \ token->eb = eb; \ } \ +} \ +void btrfs_set_##bits(struct extent_buffer *eb, void *ptr, \ + unsigned long off, u##bits val) \ +{ \ + unsigned long part_offset = (unsigned long)ptr; \ + unsigned long offset = part_offset + off; \ + void *p; \ + int err; \ + char *kaddr; \ + unsigned long map_start; \ + unsigned long map_len; \ + int size = sizeof(u##bits); \ + \ + err = map_private_extent_buffer(eb, offset, size, \ + &kaddr, &map_start, &map_len); \ + if (err) { \ + __le##bits val2; \ + \ + val2 = cpu_to_le##bits(val); \ + write_extent_buffer(eb, &val2, offset, size); \ + return; \ + } \ + p = kaddr + part_offset - map_start; \ + put_unaligned_le##bits(val, p + off); \ } DEFINE_BTRFS_SETGET_BITS(8) |