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Btrfs: Cache extent buffer mappings

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Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
2007-10-15 16:16:28 -04:00
parent db94535db7
commit 14048ed0c4
2 changed files with 49 additions and 6 deletions
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40
fs/btrfs/ctree.h
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@@ -436,10 +436,18 @@ static inline u##bits btrfs_##name(struct extent_buffer *eb, \
unsigned long map_len; \
unsigned long offset = (unsigned long)s + \
offsetof(type, member); \
err = map_extent_buffer(eb, offset, \
if (eb->map_token && offset >= eb->map_start && \
offset + sizeof(((type *)0)->member) <= eb->map_start + \
eb->map_len) { \
kaddr = eb->kaddr; \
map_start = eb->map_start; \
err = 0; \
} else { \
err = map_extent_buffer(eb, offset, \
sizeof(((type *)0)->member), \
&map_token, &kaddr, \
&map_start, &map_len, KM_USER1); \
} \
if (!err) { \
__le##bits *tmp = (__le##bits *)(kaddr + offset - \
map_start); \
@@ -464,10 +472,18 @@ static inline void btrfs_set_##name(struct extent_buffer *eb, \
int unmap_on_exit = (eb->map_token == NULL); \
unsigned long offset = (unsigned long)s + \
offsetof(type, member); \
err = map_extent_buffer(eb, offset, \
if (eb->map_token && offset >= eb->map_start && \
offset + sizeof(((type *)0)->member) <= eb->map_start + \
eb->map_len) { \
kaddr = eb->kaddr; \
map_start = eb->map_start; \
err = 0; \
} else { \
err = map_extent_buffer(eb, offset, \
sizeof(((type *)0)->member), \
&map_token, &kaddr, \
&map_start, &map_len, KM_USER1); \
} \
if (!err) { \
__le##bits *tmp = (__le##bits *)(kaddr + offset - \
map_start); \
@@ -490,10 +506,18 @@ static inline u##bits btrfs_##name(struct extent_buffer *eb) \
unsigned long map_len; \
unsigned long offset = offsetof(type, member); \
int unmap_on_exit = (eb->map_token == NULL); \
err = map_extent_buffer(eb, offset, \
if (eb->map_token && offset >= eb->map_start && \
offset + sizeof(((type *)0)->member) <= eb->map_start + \
eb->map_len) { \
kaddr = eb->kaddr; \
map_start = eb->map_start; \
err = 0; \
} else { \
err = map_extent_buffer(eb, offset, \
sizeof(((type *)0)->member), \
&map_token, &kaddr, \
&map_start, &map_len, KM_USER1); \
} \
if (!err) { \
__le##bits *tmp = (__le##bits *)(kaddr + offset - \
map_start); \
@@ -517,10 +541,18 @@ static inline void btrfs_set_##name(struct extent_buffer *eb, \
unsigned long map_len; \
unsigned long offset = offsetof(type, member); \
int unmap_on_exit = (eb->map_token == NULL); \
err = map_extent_buffer(eb, offset, \
if (eb->map_token && offset >= eb->map_start && \
offset + sizeof(((type *)0)->member) <= eb->map_start + \
eb->map_len) { \
kaddr = eb->kaddr; \
map_start = eb->map_start; \
err = 0; \
} else { \
err = map_extent_buffer(eb, offset, \
sizeof(((type *)0)->member), \
&map_token, &kaddr, \
&map_start, &map_len, KM_USER1); \
} \
if (!err) { \
__le##bits *tmp = (__le##bits *)(kaddr + offset - \
map_start); \