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Diffstat (limited to 'fs/btrfs/extent_io.c')
-rw-r--r--fs/btrfs/extent_io.c95
1 files changed, 51 insertions, 44 deletions
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 7073cbb..d2d0368 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -2,7 +2,6 @@
#include <linux/slab.h>
#include <linux/bio.h>
#include <linux/mm.h>
-#include <linux/gfp.h>
#include <linux/pagemap.h>
#include <linux/page-flags.h>
#include <linux/module.h>
@@ -513,7 +512,10 @@ int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
u64 last_end;
int err;
int set = 0;
+ int clear = 0;
+ if (bits & (EXTENT_IOBITS | EXTENT_BOUNDARY))
+ clear = 1;
again:
if (!prealloc && (mask & __GFP_WAIT)) {
prealloc = alloc_extent_state(mask);
@@ -524,14 +526,20 @@ again:
spin_lock(&tree->lock);
if (cached_state) {
cached = *cached_state;
- *cached_state = NULL;
- cached_state = NULL;
+
+ if (clear) {
+ *cached_state = NULL;
+ cached_state = NULL;
+ }
+
if (cached && cached->tree && cached->start == start) {
- atomic_dec(&cached->refs);
+ if (clear)
+ atomic_dec(&cached->refs);
state = cached;
goto hit_next;
}
- free_extent_state(cached);
+ if (clear)
+ free_extent_state(cached);
}
/*
* this search will find the extents that end after
@@ -946,11 +954,11 @@ int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
}
int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
- gfp_t mask)
+ struct extent_state **cached_state, gfp_t mask)
{
return set_extent_bit(tree, start, end,
EXTENT_DELALLOC | EXTENT_DIRTY | EXTENT_UPTODATE,
- 0, NULL, NULL, mask);
+ 0, NULL, cached_state, mask);
}
int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
@@ -984,10 +992,11 @@ int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
}
static int clear_extent_uptodate(struct extent_io_tree *tree, u64 start,
- u64 end, gfp_t mask)
+ u64 end, struct extent_state **cached_state,
+ gfp_t mask)
{
return clear_extent_bit(tree, start, end, EXTENT_UPTODATE, 0, 0,
- NULL, mask);
+ cached_state, mask);
}
int wait_on_extent_writeback(struct extent_io_tree *tree, u64 start, u64 end)
@@ -1171,7 +1180,8 @@ out:
* 1 is returned if we find something, 0 if nothing was in the tree
*/
static noinline u64 find_delalloc_range(struct extent_io_tree *tree,
- u64 *start, u64 *end, u64 max_bytes)
+ u64 *start, u64 *end, u64 max_bytes,
+ struct extent_state **cached_state)
{
struct rb_node *node;
struct extent_state *state;
@@ -1203,8 +1213,11 @@ static noinline u64 find_delalloc_range(struct extent_io_tree *tree,
*end = state->end;
goto out;
}
- if (!found)
+ if (!found) {
*start = state->start;
+ *cached_state = state;
+ atomic_inc(&state->refs);
+ }
found++;
*end = state->end;
cur_start = state->end + 1;
@@ -1336,10 +1349,11 @@ again:
delalloc_start = *start;
delalloc_end = 0;
found = find_delalloc_range(tree, &delalloc_start, &delalloc_end,
- max_bytes);
+ max_bytes, &cached_state);
if (!found || delalloc_end <= *start) {
*start = delalloc_start;
*end = delalloc_end;
+ free_extent_state(cached_state);
return found;
}
@@ -1722,7 +1736,7 @@ static void end_bio_extent_writepage(struct bio *bio, int err)
}
if (!uptodate) {
- clear_extent_uptodate(tree, start, end, GFP_NOFS);
+ clear_extent_uptodate(tree, start, end, NULL, GFP_NOFS);
ClearPageUptodate(page);
SetPageError(page);
}
@@ -1750,7 +1764,8 @@ static void end_bio_extent_writepage(struct bio *bio, int err)
static void end_bio_extent_readpage(struct bio *bio, int err)
{
int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
- struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1;
+ struct bio_vec *bvec_end = bio->bi_io_vec + bio->bi_vcnt - 1;
+ struct bio_vec *bvec = bio->bi_io_vec;
struct extent_io_tree *tree;
u64 start;
u64 end;
@@ -1773,7 +1788,7 @@ static void end_bio_extent_readpage(struct bio *bio, int err)
else
whole_page = 0;
- if (--bvec >= bio->bi_io_vec)
+ if (++bvec <= bvec_end)
prefetchw(&bvec->bv_page->flags);
if (uptodate && tree->ops && tree->ops->readpage_end_io_hook) {
@@ -1818,7 +1833,7 @@ static void end_bio_extent_readpage(struct bio *bio, int err)
}
check_page_locked(tree, page);
}
- } while (bvec >= bio->bi_io_vec);
+ } while (bvec <= bvec_end);
bio_put(bio);
}
@@ -2663,33 +2678,20 @@ int extent_readpages(struct extent_io_tree *tree,
{
struct bio *bio = NULL;
unsigned page_idx;
- struct pagevec pvec;
unsigned long bio_flags = 0;
- pagevec_init(&pvec, 0);
for (page_idx = 0; page_idx < nr_pages; page_idx++) {
struct page *page = list_entry(pages->prev, struct page, lru);
prefetchw(&page->flags);
list_del(&page->lru);
- /*
- * what we want to do here is call add_to_page_cache_lru,
- * but that isn't exported, so we reproduce it here
- */
- if (!add_to_page_cache(page, mapping,
+ if (!add_to_page_cache_lru(page, mapping,
page->index, GFP_KERNEL)) {
-
- /* open coding of lru_cache_add, also not exported */
- page_cache_get(page);
- if (!pagevec_add(&pvec, page))
- __pagevec_lru_add_file(&pvec);
__extent_read_full_page(tree, page, get_extent,
&bio, 0, &bio_flags);
}
page_cache_release(page);
}
- if (pagevec_count(&pvec))
- __pagevec_lru_add_file(&pvec);
BUG_ON(!list_empty(pages));
if (bio)
submit_one_bio(READ, bio, 0, bio_flags);
@@ -2704,6 +2706,7 @@ int extent_readpages(struct extent_io_tree *tree,
int extent_invalidatepage(struct extent_io_tree *tree,
struct page *page, unsigned long offset)
{
+ struct extent_state *cached_state = NULL;
u64 start = ((u64)page->index << PAGE_CACHE_SHIFT);
u64 end = start + PAGE_CACHE_SIZE - 1;
size_t blocksize = page->mapping->host->i_sb->s_blocksize;
@@ -2712,12 +2715,12 @@ int extent_invalidatepage(struct extent_io_tree *tree,
if (start > end)
return 0;
- lock_extent(tree, start, end, GFP_NOFS);
+ lock_extent_bits(tree, start, end, 0, &cached_state, GFP_NOFS);
wait_on_page_writeback(page);
clear_extent_bit(tree, start, end,
EXTENT_LOCKED | EXTENT_DIRTY | EXTENT_DELALLOC |
EXTENT_DO_ACCOUNTING,
- 1, 1, NULL, GFP_NOFS);
+ 1, 1, &cached_state, GFP_NOFS);
return 0;
}
@@ -2920,16 +2923,17 @@ sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
get_extent_t *get_extent)
{
struct inode *inode = mapping->host;
+ struct extent_state *cached_state = NULL;
u64 start = iblock << inode->i_blkbits;
sector_t sector = 0;
size_t blksize = (1 << inode->i_blkbits);
struct extent_map *em;
- lock_extent(&BTRFS_I(inode)->io_tree, start, start + blksize - 1,
- GFP_NOFS);
+ lock_extent_bits(&BTRFS_I(inode)->io_tree, start, start + blksize - 1,
+ 0, &cached_state, GFP_NOFS);
em = get_extent(inode, NULL, 0, start, blksize, 0);
- unlock_extent(&BTRFS_I(inode)->io_tree, start, start + blksize - 1,
- GFP_NOFS);
+ unlock_extent_cached(&BTRFS_I(inode)->io_tree, start,
+ start + blksize - 1, &cached_state, GFP_NOFS);
if (!em || IS_ERR(em))
return 0;
@@ -2951,6 +2955,7 @@ int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
u32 flags = 0;
u64 disko = 0;
struct extent_map *em = NULL;
+ struct extent_state *cached_state = NULL;
int end = 0;
u64 em_start = 0, em_len = 0;
unsigned long emflags;
@@ -2959,8 +2964,8 @@ int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
if (len == 0)
return -EINVAL;
- lock_extent(&BTRFS_I(inode)->io_tree, start, start + len,
- GFP_NOFS);
+ lock_extent_bits(&BTRFS_I(inode)->io_tree, start, start + len, 0,
+ &cached_state, GFP_NOFS);
em = get_extent(inode, NULL, 0, off, max - off, 0);
if (!em)
goto out;
@@ -3023,8 +3028,8 @@ int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
out_free:
free_extent_map(em);
out:
- unlock_extent(&BTRFS_I(inode)->io_tree, start, start + len,
- GFP_NOFS);
+ unlock_extent_cached(&BTRFS_I(inode)->io_tree, start, start + len,
+ &cached_state, GFP_NOFS);
return ret;
}
@@ -3264,7 +3269,8 @@ int set_extent_buffer_dirty(struct extent_io_tree *tree,
}
int clear_extent_buffer_uptodate(struct extent_io_tree *tree,
- struct extent_buffer *eb)
+ struct extent_buffer *eb,
+ struct extent_state **cached_state)
{
unsigned long i;
struct page *page;
@@ -3274,7 +3280,7 @@ int clear_extent_buffer_uptodate(struct extent_io_tree *tree,
clear_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags);
clear_extent_uptodate(tree, eb->start, eb->start + eb->len - 1,
- GFP_NOFS);
+ cached_state, GFP_NOFS);
for (i = 0; i < num_pages; i++) {
page = extent_buffer_page(eb, i);
if (page)
@@ -3334,7 +3340,8 @@ int extent_range_uptodate(struct extent_io_tree *tree,
}
int extent_buffer_uptodate(struct extent_io_tree *tree,
- struct extent_buffer *eb)
+ struct extent_buffer *eb,
+ struct extent_state *cached_state)
{
int ret = 0;
unsigned long num_pages;
@@ -3346,7 +3353,7 @@ int extent_buffer_uptodate(struct extent_io_tree *tree,
return 1;
ret = test_range_bit(tree, eb->start, eb->start + eb->len - 1,
- EXTENT_UPTODATE, 1, NULL);
+ EXTENT_UPTODATE, 1, cached_state);
if (ret)
return ret;
generated by cgit v1.1 at 2024-12-24 00:30:01 +0000