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Btrfs: Allow tree blocks larger than the page size
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
parent
1a5bc167f6
commit
db94535db7
15 changed files with 738 additions and 497 deletions
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@ -1963,18 +1963,27 @@ static inline struct page *extent_buffer_page(struct extent_buffer *eb, int i)
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struct page *p;
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if (i == 0)
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return eb->first_page;
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i += eb->start >> PAGE_CACHE_SHIFT;
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if (eb->last_page && eb->last_page->index == i)
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return eb->last_page;
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p = find_get_page(eb->first_page->mapping, i);
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page_cache_release(p);
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eb->last_page = p;
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return p;
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}
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static inline unsigned long num_extent_pages(u64 start, u64 len)
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{
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return ((start + len + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT) -
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(start >> PAGE_CACHE_SHIFT);
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}
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struct extent_buffer *alloc_extent_buffer(struct extent_map_tree *tree,
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u64 start, unsigned long len,
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gfp_t mask)
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{
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unsigned long num_pages = ((start + len - 1) >> PAGE_CACHE_SHIFT) -
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(start >> PAGE_CACHE_SHIFT) + 1;
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unsigned long num_pages = num_extent_pages(start, len);
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unsigned long i;
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unsigned long index = start >> PAGE_CACHE_SHIFT;
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struct extent_buffer *eb;
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@ -1986,7 +1995,7 @@ struct extent_buffer *alloc_extent_buffer(struct extent_map_tree *tree,
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if (!eb || IS_ERR(eb))
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return NULL;
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eb->alloc_addr = __builtin_return_address(0);
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eb->alloc_addr = (unsigned long)__builtin_return_address(0);
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eb->start = start;
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eb->len = len;
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atomic_set(&eb->refs, 1);
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@ -1994,6 +2003,7 @@ struct extent_buffer *alloc_extent_buffer(struct extent_map_tree *tree,
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for (i = 0; i < num_pages; i++, index++) {
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p = find_or_create_page(mapping, index, mask | __GFP_HIGHMEM);
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if (!p) {
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WARN_ON(1);
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/* make sure the free only frees the pages we've
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* grabbed a reference on
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*/
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@ -2021,8 +2031,7 @@ struct extent_buffer *find_extent_buffer(struct extent_map_tree *tree,
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u64 start, unsigned long len,
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gfp_t mask)
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{
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unsigned long num_pages = ((start + len - 1) >> PAGE_CACHE_SHIFT) -
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(start >> PAGE_CACHE_SHIFT) + 1;
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unsigned long num_pages = num_extent_pages(start, len);
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unsigned long i;
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unsigned long index = start >> PAGE_CACHE_SHIFT;
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struct extent_buffer *eb;
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@ -2033,7 +2042,7 @@ struct extent_buffer *find_extent_buffer(struct extent_map_tree *tree,
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if (!eb || IS_ERR(eb))
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return NULL;
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eb->alloc_addr = __builtin_return_address(0);
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eb->alloc_addr = (unsigned long)__builtin_return_address(0);
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eb->start = start;
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eb->len = len;
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atomic_set(&eb->refs, 1);
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@ -2070,8 +2079,7 @@ void free_extent_buffer(struct extent_buffer *eb)
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if (!atomic_dec_and_test(&eb->refs))
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return;
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num_pages = ((eb->start + eb->len - 1) >> PAGE_CACHE_SHIFT) -
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(eb->start >> PAGE_CACHE_SHIFT) + 1;
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num_pages = num_extent_pages(eb->start, eb->len);
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if (eb->first_page)
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page_cache_release(eb->first_page);
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@ -2094,8 +2102,7 @@ int clear_extent_buffer_dirty(struct extent_map_tree *tree,
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u64 end = start + eb->len - 1;
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set = clear_extent_dirty(tree, start, end, GFP_NOFS);
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num_pages = ((eb->start + eb->len - 1) >> PAGE_CACHE_SHIFT) -
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(eb->start >> PAGE_CACHE_SHIFT) + 1;
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num_pages = num_extent_pages(eb->start, eb->len);
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for (i = 0; i < num_pages; i++) {
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page = extent_buffer_page(eb, i);
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@ -2145,8 +2152,7 @@ int set_extent_buffer_uptodate(struct extent_map_tree *tree,
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struct page *page;
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unsigned long num_pages;
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num_pages = ((eb->start + eb->len - 1) >> PAGE_CACHE_SHIFT) -
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(eb->start >> PAGE_CACHE_SHIFT) + 1;
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num_pages = num_extent_pages(eb->start, eb->len);
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set_extent_uptodate(tree, eb->start, eb->start + eb->len - 1,
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GFP_NOFS);
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@ -2191,8 +2197,7 @@ int read_extent_buffer_pages(struct extent_map_tree *tree,
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return 0;
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}
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num_pages = ((eb->start + eb->len - 1) >> PAGE_CACHE_SHIFT) -
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(eb->start >> PAGE_CACHE_SHIFT) + 1;
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num_pages = num_extent_pages(eb->start, eb->len);
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for (i = 0; i < num_pages; i++) {
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page = extent_buffer_page(eb, i);
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if (PageUptodate(page)) {
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@ -2267,14 +2272,14 @@ void read_extent_buffer(struct extent_buffer *eb, void *dstv,
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}
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EXPORT_SYMBOL(read_extent_buffer);
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int map_extent_buffer(struct extent_buffer *eb, unsigned long start,
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unsigned long min_len,
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char **token, char **map,
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unsigned long *map_start,
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unsigned long *map_len, int km)
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static int __map_extent_buffer(struct extent_buffer *eb, unsigned long start,
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unsigned long min_len, char **token, char **map,
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unsigned long *map_start,
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unsigned long *map_len, int km)
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{
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size_t offset = start & (PAGE_CACHE_SIZE - 1);
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char *kaddr;
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struct page *p;
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size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1);
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unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT;
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unsigned long end_i = (start_offset + start + min_len) >>
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@ -2283,21 +2288,59 @@ int map_extent_buffer(struct extent_buffer *eb, unsigned long start,
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if (i != end_i)
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return -EINVAL;
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WARN_ON(start > eb->len);
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if (start >= eb->len) {
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printk("bad start in map eb start %Lu len %lu caller start %lu min %lu\n", eb->start, eb->len, start, min_len);
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WARN_ON(1);
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}
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if (i == 0) {
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offset = start_offset;
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*map_start = 0;
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} else {
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offset = 0;
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*map_start = (i << PAGE_CACHE_SHIFT) - start_offset;
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}
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kaddr = kmap_atomic(extent_buffer_page(eb, i), km);
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p = extent_buffer_page(eb, i);
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WARN_ON(!PageUptodate(p));
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kaddr = kmap_atomic(p, km);
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*token = kaddr;
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*map = kaddr + offset;
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*map_len = PAGE_CACHE_SIZE - offset;
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return 0;
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}
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int map_extent_buffer(struct extent_buffer *eb, unsigned long start,
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unsigned long min_len,
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char **token, char **map,
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unsigned long *map_start,
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unsigned long *map_len, int km)
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{
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int err;
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int save = 0;
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if (eb->map_token) {
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if (start >= eb->map_start &&
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start + min_len <= eb->map_start + eb->map_len) {
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*token = eb->map_token;
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*map = eb->kaddr;
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*map_start = eb->map_start;
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*map_len = eb->map_len;
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return 0;
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}
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unmap_extent_buffer(eb, eb->map_token, km);
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eb->map_token = NULL;
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save = 1;
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}
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err = __map_extent_buffer(eb, start, min_len, token, map,
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map_start, map_len, km);
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if (!err && save) {
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eb->map_token = *token;
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eb->kaddr = *map;
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eb->map_start = *map_start;
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eb->map_len = *map_len;
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}
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return err;
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}
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EXPORT_SYMBOL(map_extent_buffer);
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void unmap_extent_buffer(struct extent_buffer *eb, char *token, int km)
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@ -2574,7 +2617,6 @@ void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
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((unsigned long)PAGE_CACHE_SIZE - 1);
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src_off_in_page = src_end &
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((unsigned long)PAGE_CACHE_SIZE - 1);
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if (src_i == 0)
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src_off_in_page += start_offset;
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if (dst_i == 0)
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@ -2582,14 +2624,13 @@ void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
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cur = min(len, src_off_in_page + 1);
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cur = min(cur, dst_off_in_page + 1);
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move_pages(extent_buffer_page(dst, dst_i),
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extent_buffer_page(dst, src_i),
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dst_off_in_page - cur + 1,
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src_off_in_page - cur + 1, cur);
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dst_end -= cur - 1;
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src_end -= cur - 1;
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dst_end -= cur;
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src_end -= cur;
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len -= cur;
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}
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}
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