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Btrfs: Go back to kmaps instead of page_address in extent_buffers 

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2007-10-15 16:14:41 -04:00
parent 6d36dcd48f
commit ae5252bd51
1 changed files with 19 additions and 31 deletions
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50
fs/btrfs/extent_map.c
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@ -1867,7 +1867,6 @@ sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
if (!em || IS_ERR(em))
return 0;
// XXX(hch): block 0 is valid in some cases, e.g. XFS RT device
if (em->block_start == EXTENT_MAP_INLINE ||
em->block_start == EXTENT_MAP_HOLE)
return 0;
@ -2199,10 +2198,9 @@ void read_extent_buffer(struct extent_buffer *eb, void *dstv,
WARN_ON(!PageUptodate(page));
cur = min(len, (PAGE_CACHE_SIZE - offset));
// kaddr = kmap_atomic(page, KM_USER0);
kaddr = page_address(page);
kaddr = kmap_atomic(page, KM_USER0);
memcpy(dst, kaddr + offset, cur);
// kunmap_atomic(kaddr, KM_USER0);
kunmap_atomic(kaddr, KM_USER0);
dst += cur;
len -= cur;
@ -2237,8 +2235,7 @@ int map_extent_buffer(struct extent_buffer *eb, unsigned long start,
*map_start = (i << PAGE_CACHE_SHIFT) - start_offset;
}
// kaddr = kmap_atomic(eb->pages[i], km);
kaddr = page_address(extent_buffer_page(eb, i));
kaddr = kmap_atomic(extent_buffer_page(eb, i), km);
*token = kaddr;
*map = kaddr + offset;
*map_len = PAGE_CACHE_SIZE - offset;
@ -2248,7 +2245,7 @@ EXPORT_SYMBOL(map_extent_buffer);
void unmap_extent_buffer(struct extent_buffer *eb, char *token, int km)
{
// kunmap_atomic(token, km);
kunmap_atomic(token, km);
}
EXPORT_SYMBOL(unmap_extent_buffer);
@ -2278,10 +2275,9 @@ int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
cur = min(len, (PAGE_CACHE_SIZE - offset));
// kaddr = kmap_atomic(page, KM_USER0);
kaddr = page_address(page);
kaddr = kmap_atomic(page, KM_USER0);
ret = memcmp(ptr, kaddr + offset, cur);
// kunmap_atomic(kaddr, KM_USER0);
kunmap_atomic(kaddr, KM_USER0);
if (ret)
break;
@ -2317,10 +2313,9 @@ void write_extent_buffer(struct extent_buffer *eb, const void *srcv,
WARN_ON(!PageUptodate(page));
cur = min(len, PAGE_CACHE_SIZE - offset);
// kaddr = kmap_atomic(page, KM_USER0);
kaddr = page_address(page);
kaddr = kmap_atomic(page, KM_USER0);
memcpy(kaddr + offset, src, cur);
// kunmap_atomic(kaddr, KM_USER0);
kunmap_atomic(kaddr, KM_USER0);
src += cur;
len -= cur;
@ -2352,10 +2347,9 @@ void memset_extent_buffer(struct extent_buffer *eb, char c,
WARN_ON(!PageUptodate(page));
cur = min(len, PAGE_CACHE_SIZE - offset);
// kaddr = kmap_atomic(page, KM_USER0);
kaddr = page_address(page);
kaddr = kmap_atomic(page, KM_USER0);
memset(kaddr + offset, c, cur);
// kunmap_atomic(kaddr, KM_USER0);
kunmap_atomic(kaddr, KM_USER0);
len -= cur;
offset = 0;
@ -2388,10 +2382,9 @@ void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
cur = min(len, (unsigned long)(PAGE_CACHE_SIZE - offset));
// kaddr = kmap_atomic(page, KM_USER1);
kaddr = page_address(page);
kaddr = kmap_atomic(page, KM_USER1);
read_extent_buffer(src, kaddr + offset, src_offset, cur);
// kunmap_atomic(kaddr, KM_USER1);
kunmap_atomic(kaddr, KM_USER1);
src_offset += cur;
len -= cur;
@ -2405,43 +2398,38 @@ static void move_pages(struct page *dst_page, struct page *src_page,
unsigned long dst_off, unsigned long src_off,
unsigned long len)
{
// char *dst_kaddr = kmap_atomic(dst_page, KM_USER0);
char *dst_kaddr = page_address(dst_page);
char *dst_kaddr = kmap_atomic(dst_page, KM_USER0);
if (dst_page == src_page) {
memmove(dst_kaddr + dst_off, dst_kaddr + src_off, len);
} else {
// char *src_kaddr = kmap_atomic(src_page, KM_USER1);
char *src_kaddr = page_address(src_page);
char *src_kaddr = kmap_atomic(src_page, KM_USER1);
char *p = dst_kaddr + dst_off + len;
char *s = src_kaddr + src_off + len;
while (len--)
*--p = *--s;
// kunmap_atomic(src_kaddr, KM_USER1);
kunmap_atomic(src_kaddr, KM_USER1);
}
// kunmap_atomic(dst_kaddr, KM_USER0);
kunmap_atomic(dst_kaddr, KM_USER0);
}
static void copy_pages(struct page *dst_page, struct page *src_page,
unsigned long dst_off, unsigned long src_off,
unsigned long len)
{
//kmap_atomic(dst_page, KM_USER0);
char *dst_kaddr = page_address(dst_page);
char *dst_kaddr = kmap_atomic(dst_page, KM_USER0);
char *src_kaddr;
if (dst_page != src_page)
src_kaddr = page_address(src_page); // kmap_atomic(src_page, KM_USER1);
src_kaddr = kmap_atomic(src_page, KM_USER1);
else
src_kaddr = dst_kaddr;
memcpy(dst_kaddr + dst_off, src_kaddr + src_off, len);
/*
kunmap_atomic(dst_kaddr, KM_USER0);
if (dst_page != src_page)
kunmap_atomic(src_kaddr, KM_USER1);
*/
}
void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
@ -2537,7 +2525,7 @@ void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
cur = min(len, src_off_in_page + 1);
cur = min(cur, dst_off_in_page + 1);
// printk("move pages orig dst %lu src %lu len %lu, this %lu %lu %lu\n", dst_offset, src_offset, len, dst_off_in_page - cur + 1, src_off_in_page - cur + 1, cur);
move_pages(extent_buffer_page(dst, dst_i),
extent_buffer_page(dst, src_i),
dst_off_in_page - cur + 1,