* [RFC PATCH V2 0/8] Btrfs: Subpagesize-blocksize: Get rid of whole page I/O
@ 2014-06-11 11:32 Chandan Rajendra
2014-06-11 11:32 ` [RFC PATCH V2 1/8] Btrfs: subpagesize-blocksize: Get rid of whole page reads Chandan Rajendra
` (7 more replies)
0 siblings, 8 replies; 9+ messages in thread
From: Chandan Rajendra @ 2014-06-11 11:32 UTC (permalink / raw)
To: clm, jbacik, bo.li.liu, dsterba
Cc: Chandan Rajendra, linux-btrfs, aneesh.kumar
This patchset continues with the work posted earlier at
https://www.mail-archive.com/linux-btrfs@vger.kernel.org/msg34036.html.
Changes from V1:
1. Remove usage of bio_vec->bv_{len,offset} in end_bio_extent_readpage()
and end_bio_extent_writepage().
Xfstests' generic tests were run on an x86_64 machine with the patches
applied.
On multiple runs of the tests with 4k blocksize, 'umount' process would
sometimes get blocked indefinitely causing 'hung task detector' to print the
function call trace. Also, there are occasional instances where warning
messages from btree_invalidatepage() is being printed to indicate that
PG_private flag of a page is still set.
For 2k blocksize only a few Xfstests' generic tests pass.
The following is a list of known TODO items which will be implemented in
future revisions of this patchset:
1. Remove usage of bvec->{bv_offset, bv_len} from btrfs_csum_one_bio.
2. Get __extent_writepage() to write dirty blocks that don't start at
page_offset(page). In such a scenario and with the current
patchset, brfs_csum_one_bio() hits a BUG_ON() when searching for a
non-existant ordered extent that would begin at file offset mapped by
the first byte of the corresponding page.
3. Remove PAGE_CACHE_SIZE delalloc reservation in btrfs_writepage_fixup_worker().
4. Create separate slab caches for 'extent buffer head' and 'extent buffer'.
5. Add 'leak list' tracking for 'extent buffer' instances.
6. Rename EXTENT_BUFFER_TREE_REF and EXTENT_BUFFER_IN_TREE to
EXTENT_BUFFER_HEAD_TREE_REF and EXTENT_BUFFER_HEAD_IN_TREE respectively.
7. Get Xfstests' generic tests to successfully run on both 4k and 2k
blocksizes.
Chandan Rajendra (6):
Btrfs: subpagesize-blocksize: Get rid of whole page reads.
Btrfs: subpagesize-blocksize: Get rid of whole page writes.
Btrfs: subpagesize-blocksize: __btrfs_buffered_write: Reserve/release
extents aligned to block size.
Btrfs: subpagesize-blocksize: Read tree blocks whose size is
<PAGE_CACHE_SIZE.
Btrfs: subpagesize-blocksize: Write only dirty extent buffers
belonging to a page
Btrfs: subpagesize-blocksize: Compute and look up csums based on
sectorsized blocks.
Chandra Seetharaman (2):
Btrfs: subpagesize-blocksize: Define extent_buffer_head.
Btrfs: subpagesize-blocksize: Allow mounting filesystems where
sectorsize != PAGE_SIZE
fs/btrfs/backref.c | 2 +-
fs/btrfs/ctree.c | 2 +-
fs/btrfs/ctree.h | 6 +-
fs/btrfs/disk-io.c | 117 +++--
fs/btrfs/disk-io.h | 3 +
fs/btrfs/extent-tree.c | 6 +-
fs/btrfs/extent_io.c | 1131 +++++++++++++++++++++++++++++-------------
fs/btrfs/extent_io.h | 48 +-
fs/btrfs/file-item.c | 85 ++--
fs/btrfs/file.c | 32 +-
fs/btrfs/inode.c | 45 +-
fs/btrfs/volumes.c | 2 +-
fs/btrfs/volumes.h | 3 +
include/trace/events/btrfs.h | 2 +-
14 files changed, 1004 insertions(+), 480 deletions(-)
--
1.8.3.1
^ permalink raw reply [flat|nested] 9+ messages in thread
* [RFC PATCH V2 1/8] Btrfs: subpagesize-blocksize: Get rid of whole page reads.
2014-06-11 11:32 [RFC PATCH V2 0/8] Btrfs: Subpagesize-blocksize: Get rid of whole page I/O Chandan Rajendra
@ 2014-06-11 11:32 ` Chandan Rajendra
2014-06-11 11:32 ` [RFC PATCH V2 2/8] Btrfs: subpagesize-blocksize: Get rid of whole page writes Chandan Rajendra
` (6 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: Chandan Rajendra @ 2014-06-11 11:32 UTC (permalink / raw)
To: clm, jbacik, bo.li.liu, dsterba
Cc: Chandan Rajendra, linux-btrfs, aneesh.kumar
Based on original patch from Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
bio_vec->{bv_offset, bv_len} cannot be relied upon by the end bio functions
to track the file offset range operated on by the bio. Hence this patch adds
two new members to 'struct btrfs_io_bio' to track the file offset range.
This patch also brings back check_page_locked() to reliably unlock pages in
readpage's end bio function.
Signed-off-by: Chandan Rajendra <chandan@linux.vnet.ibm.com>
---
fs/btrfs/extent_io.c | 200 ++++++++++++++++++++++-----------------------------
fs/btrfs/volumes.h | 3 +
2 files changed, 90 insertions(+), 113 deletions(-)
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index fbe501d..fa28545 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -1943,15 +1943,29 @@ int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
* helper function to set a given page up to date if all the
* extents in the tree for that page are up to date
*/
-static void check_page_uptodate(struct extent_io_tree *tree, struct page *page)
+static void check_page_uptodate(struct extent_io_tree *tree, struct page *page,
+ struct extent_state *cached)
{
u64 start = page_offset(page);
u64 end = start + PAGE_CACHE_SIZE - 1;
- if (test_range_bit(tree, start, end, EXTENT_UPTODATE, 1, NULL))
+ if (test_range_bit(tree, start, end, EXTENT_UPTODATE, 1, cached))
SetPageUptodate(page);
}
/*
+ * helper function to unlock a page if all the extents in the tree
+ * for that page are unlocked
+ */
+static void check_page_locked(struct extent_io_tree *tree, struct page *page)
+{
+ u64 start = page_offset(page);
+ u64 end = start + PAGE_CACHE_SIZE - 1;
+
+ if (!test_range_bit(tree, start, end, EXTENT_LOCKED, 0, NULL)) {
+ unlock_page(page);
+ }
+}
+
* When IO fails, either with EIO or csum verification fails, we
* try other mirrors that might have a good copy of the data. This
* io_failure_record is used to record state as we go through all the
@@ -2173,6 +2187,7 @@ static int bio_readpage_error(struct bio *failed_bio, u64 phy_offset,
struct bio *bio;
struct btrfs_io_bio *btrfs_failed_bio;
struct btrfs_io_bio *btrfs_bio;
+ int nr_sectors;
int num_copies;
int ret;
int read_mode;
@@ -2267,7 +2282,8 @@ static int bio_readpage_error(struct bio *failed_bio, u64 phy_offset,
* a) deliver good data to the caller
* b) correct the bad sectors on disk
*/
- if (failed_bio->bi_vcnt > 1) {
+ nr_sectors = btrfs_io_bio(failed_bio)->len >> inode->i_sb->s_blocksize_bits;
+ if (nr_sectors > 1) {
/*
* to fulfill b), we need to know the exact failing sectors, as
* we don't want to rewrite any more than the failed ones. thus,
@@ -2314,6 +2330,8 @@ static int bio_readpage_error(struct bio *failed_bio, u64 phy_offset,
bio->bi_sector = failrec->logical >> 9;
bio->bi_bdev = BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev;
bio->bi_size = 0;
+ btrfs_io_bio(bio)->start_offset = start;
+ btrfs_io_bio(bio)->len = end - start + 1;
btrfs_failed_bio = btrfs_io_bio(failed_bio);
if (btrfs_failed_bio->csum) {
@@ -2414,18 +2432,6 @@ static void end_bio_extent_writepage(struct bio *bio, int err)
bio_put(bio);
}
-static void
-endio_readpage_release_extent(struct extent_io_tree *tree, u64 start, u64 len,
- int uptodate)
-{
- struct extent_state *cached = NULL;
- u64 end = start + len - 1;
-
- if (uptodate && tree->track_uptodate)
- set_extent_uptodate(tree, start, end, &cached, GFP_ATOMIC);
- unlock_extent_cached(tree, start, end, &cached, GFP_ATOMIC);
-}
-
/*
* after a readpage IO is done, we need to:
* clear the uptodate bits on error
@@ -2440,76 +2446,50 @@ endio_readpage_release_extent(struct extent_io_tree *tree, u64 start, u64 len,
static void end_bio_extent_readpage(struct bio *bio, int err)
{
int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
- struct bio_vec *bvec_end = bio->bi_io_vec + bio->bi_vcnt - 1;
- struct bio_vec *bvec = bio->bi_io_vec;
struct btrfs_io_bio *io_bio = btrfs_io_bio(bio);
+ struct bio_vec *bvec = bio->bi_io_vec;
+ struct bio_vec *bvec_end = bio->bi_io_vec + bio->bi_vcnt - 1;
+ struct address_space *mapping;
+ struct extent_state *cached = NULL;
struct extent_io_tree *tree;
- u64 offset = 0;
+ struct btrfs_root *root;
+ struct inode *inode;
+ struct page *page;
u64 start;
- u64 end;
+ u64 offset = 0;
u64 len;
- u64 extent_start = 0;
- u64 extent_len = 0;
+ int nr_sectors;
int mirror;
int ret;
- if (err)
- uptodate = 0;
+ mapping = bio->bi_io_vec->bv_page->mapping;
+ inode = mapping->host;
+ root = BTRFS_I(inode)->root;
+ tree = &BTRFS_I(inode)->io_tree;
- do {
- struct page *page = bvec->bv_page;
- struct inode *inode = page->mapping->host;
-
- pr_debug("end_bio_extent_readpage: bi_sector=%llu, err=%d, "
- "mirror=%lu\n", (u64)bio->bi_sector, err,
- io_bio->mirror_num);
- tree = &BTRFS_I(inode)->io_tree;
-
- /* We always issue full-page reads, but if some block
- * in a page fails to read, blk_update_request() will
- * advance bv_offset and adjust bv_len to compensate.
- * Print a warning for nonzero offsets, and an error
- * if they don't add up to a full page. */
- if (bvec->bv_offset || bvec->bv_len != PAGE_CACHE_SIZE) {
- if (bvec->bv_offset + bvec->bv_len != PAGE_CACHE_SIZE)
- btrfs_err(BTRFS_I(page->mapping->host)->root->fs_info,
- "partial page read in btrfs with offset %u and length %u",
- bvec->bv_offset, bvec->bv_len);
- else
- btrfs_info(BTRFS_I(page->mapping->host)->root->fs_info,
- "incomplete page read in btrfs with offset %u and "
- "length %u",
- bvec->bv_offset, bvec->bv_len);
- }
+ start = btrfs_io_bio(bio)->start_offset;
+ len = btrfs_io_bio(bio)->len;
+ mirror = io_bio->mirror_num;
- start = page_offset(page);
- end = start + bvec->bv_offset + bvec->bv_len - 1;
- len = bvec->bv_len;
+ nr_sectors = len >> inode->i_sb->s_blocksize_bits;
+ BUG_ON(!nr_sectors);
- if (++bvec <= bvec_end)
- prefetchw(&bvec->bv_page->flags);
+ do {
+ BUG_ON(bvec > bvec_end);
+ page = bvec->bv_page;
- mirror = io_bio->mirror_num;
- if (likely(uptodate && tree->ops &&
- tree->ops->readpage_end_io_hook)) {
+ if (uptodate) {
ret = tree->ops->readpage_end_io_hook(io_bio, offset,
- page, start, end,
- mirror);
+ page, start,
+ start + root->sectorsize - 1,
+ mirror);
if (ret)
uptodate = 0;
else
clean_io_failure(start, page);
}
- if (likely(uptodate))
- goto readpage_ok;
-
- if (tree->ops && tree->ops->readpage_io_failed_hook) {
- ret = tree->ops->readpage_io_failed_hook(page, mirror);
- if (!ret && !err &&
- test_bit(BIO_UPTODATE, &bio->bi_flags))
- uptodate = 1;
- } else {
+ if (!uptodate) {
/*
* The generic bio_readpage_error handles errors the
* following way: If possible, new read requests are
@@ -2520,63 +2500,38 @@ static void end_bio_extent_readpage(struct bio *bio, int err)
* can't handle the error it will return -EIO and we
* remain responsible for that page.
*/
- ret = bio_readpage_error(bio, offset, page, start, end,
- mirror);
+ ret = bio_readpage_error(bio, offset, page,
+ start, start + root->sectorsize - 1,
+ mirror);
if (ret == 0) {
- uptodate =
- test_bit(BIO_UPTODATE, &bio->bi_flags);
+ uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
if (err)
uptodate = 0;
- continue;
+ goto next_block;
}
}
-readpage_ok:
- if (likely(uptodate)) {
- loff_t i_size = i_size_read(inode);
- pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT;
- unsigned offset;
-
- /* Zero out the end if this page straddles i_size */
- offset = i_size & (PAGE_CACHE_SIZE-1);
- if (page->index == end_index && offset)
- zero_user_segment(page, offset, PAGE_CACHE_SIZE);
- SetPageUptodate(page);
+
+ if (uptodate) {
+ set_extent_uptodate(tree, start,
+ start + root->sectorsize - 1,
+ &cached, GFP_ATOMIC);
+ check_page_uptodate(tree, page, cached);
} else {
ClearPageUptodate(page);
SetPageError(page);
}
- unlock_page(page);
- offset += len;
-
- if (unlikely(!uptodate)) {
- if (extent_len) {
- endio_readpage_release_extent(tree,
- extent_start,
- extent_len, 1);
- extent_start = 0;
- extent_len = 0;
- }
- endio_readpage_release_extent(tree, start,
- end - start + 1, 0);
- } else if (!extent_len) {
- extent_start = start;
- extent_len = end + 1 - start;
- } else if (extent_start + extent_len == start) {
- extent_len += end + 1 - start;
- } else {
- endio_readpage_release_extent(tree, extent_start,
- extent_len, uptodate);
- extent_start = start;
- extent_len = end + 1 - start;
- }
- } while (bvec <= bvec_end);
- if (extent_len)
- endio_readpage_release_extent(tree, extent_start, extent_len,
- uptodate);
+ unlock_extent(tree, start, start + root->sectorsize - 1);
+ check_page_locked(tree, page);
+next_block:
+ offset += root->sectorsize;
+ start += root->sectorsize;
+ if ((page_offset(page) + PAGE_CACHE_SIZE) == start)
+ ++bvec;
+ } while (--nr_sectors);
+
if (io_bio->end_io)
io_bio->end_io(io_bio, err);
- bio_put(bio);
}
/*
@@ -2700,6 +2655,18 @@ static int submit_extent_page(int rw, struct extent_io_tree *tree,
else
contig = bio_end_sector(bio) == sector;
+ if (contig) {
+ /*
+ * Check whether we are contig if file offsets.
+ * We should mostly be for readpage/readpages
+ * We need to do this because we use btrfs_io_bio
+ * start_offset and len to unlock in endio routines.
+ */
+ if ((page_offset(page) + offset) !=
+ (btrfs_io_bio(bio)->start_offset +
+ btrfs_io_bio(bio)->len))
+ contig = 0;
+ }
if (prev_bio_flags != bio_flags || !contig ||
merge_bio(rw, tree, page, offset, page_size, bio, bio_flags) ||
bio_add_page(bio, page, page_size, offset) < page_size) {
@@ -2709,6 +2676,11 @@ static int submit_extent_page(int rw, struct extent_io_tree *tree,
return ret;
bio = NULL;
} else {
+ /*
+ * update btrfs_io_bio len. So that we can unlock
+ * correctly in end_io callback.
+ */
+ btrfs_io_bio(bio)->len += page_size;
return 0;
}
}
@@ -2724,6 +2696,8 @@ static int submit_extent_page(int rw, struct extent_io_tree *tree,
bio_add_page(bio, page, page_size, offset);
bio->bi_end_io = end_io_func;
bio->bi_private = tree;
+ btrfs_io_bio(bio)->start_offset = page_offset(page) + offset;
+ btrfs_io_bio(bio)->len = page_size;
if (bio_ret)
*bio_ret = bio;
@@ -2914,7 +2888,7 @@ static int __do_readpage(struct extent_io_tree *tree,
/* the get_extent function already copied into the page */
if (test_range_bit(tree, cur, cur_end,
EXTENT_UPTODATE, 1, NULL)) {
- check_page_uptodate(tree, page);
+ check_page_uptodate(tree, page, NULL);
if (!parent_locked)
unlock_extent(tree, cur, cur + iosize - 1);
cur = cur + iosize;
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
index 80754f9..fb2dbdc 100644
--- a/fs/btrfs/volumes.h
+++ b/fs/btrfs/volumes.h
@@ -173,6 +173,9 @@ struct btrfs_io_bio {
u8 csum_inline[BTRFS_BIO_INLINE_CSUM_SIZE];
u8 *csum_allocated;
btrfs_io_bio_end_io_t *end_io;
+ /* Track file offset range operated on by the bio.*/
+ u64 start_offset;
+ u64 len;
struct bio bio;
};
--
1.8.3.1
^ permalink raw reply related [flat|nested] 9+ messages in thread
* [RFC PATCH V2 2/8] Btrfs: subpagesize-blocksize: Get rid of whole page writes.
2014-06-11 11:32 [RFC PATCH V2 0/8] Btrfs: Subpagesize-blocksize: Get rid of whole page I/O Chandan Rajendra
2014-06-11 11:32 ` [RFC PATCH V2 1/8] Btrfs: subpagesize-blocksize: Get rid of whole page reads Chandan Rajendra
@ 2014-06-11 11:32 ` Chandan Rajendra
2014-06-11 11:32 ` [RFC PATCH V2 3/8] Btrfs: subpagesize-blocksize: __btrfs_buffered_write: Reserve/release extents aligned to block size Chandan Rajendra
` (5 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: Chandan Rajendra @ 2014-06-11 11:32 UTC (permalink / raw)
To: clm, jbacik, bo.li.liu, dsterba
Cc: Chandan Rajendra, linux-btrfs, aneesh.kumar
This commit brings back functions that set/clear EXTENT_WRITEBACK bits. These
are required to reliably clear PG_writeback page flag.
Signed-off-by: Chandan Rajendra <chandan@linux.vnet.ibm.com>
---
fs/btrfs/extent_io.c | 147 +++++++++++++++++++++++++++++++++++----------------
fs/btrfs/extent_io.h | 2 +-
fs/btrfs/inode.c | 45 ++++++++++++----
3 files changed, 136 insertions(+), 58 deletions(-)
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index fa28545..20d8bdc 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -1293,6 +1293,20 @@ int clear_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
cached_state, mask);
}
+static int set_extent_writeback(struct extent_io_tree *tree, u64 start, u64 end,
+ struct extent_state **cached_state, gfp_t mask)
+{
+ return set_extent_bit(tree, start, end, EXTENT_WRITEBACK, NULL,
+ cached_state, mask);
+}
+
+static int clear_extent_writeback(struct extent_io_tree *tree, u64 start, u64 end,
+ struct extent_state **cached_state, gfp_t mask)
+{
+ return clear_extent_bit(tree, start, end, EXTENT_WRITEBACK, 1, 0,
+ cached_state, mask);
+}
+
/*
* either insert or lock state struct between start and end use mask to tell
* us if waiting is desired.
@@ -1399,6 +1413,7 @@ static int set_range_writeback(struct extent_io_tree *tree, u64 start, u64 end)
page_cache_release(page);
index++;
}
+ set_extent_writeback(tree, start, end, NULL, GFP_NOFS);
return 0;
}
@@ -1966,6 +1981,16 @@ static void check_page_locked(struct extent_io_tree *tree, struct page *page)
}
}
+static void check_page_writeback(struct extent_io_tree *tree, struct page *page)
+{
+ u64 start = page_offset(page);
+ u64 end = start + PAGE_CACHE_SIZE - 1;
+
+ if (!test_range_bit(tree, start, end, EXTENT_WRITEBACK, 0, NULL))
+ end_page_writeback(page);
+}
+
+/*
* When IO fails, either with EIO or csum verification fails, we
* try other mirrors that might have a good copy of the data. This
* io_failure_record is used to record state as we go through all the
@@ -2359,27 +2384,69 @@ static int bio_readpage_error(struct bio *failed_bio, u64 phy_offset,
}
/* lots and lots of room for performance fixes in the end_bio funcs */
-
-int end_extent_writepage(struct page *page, int err, u64 start, u64 end)
+void end_extents_write(struct inode *inode, int err, u64 start, u64 end)
{
+ struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree;
int uptodate = (err == 0);
- struct extent_io_tree *tree;
+ pgoff_t index, end_index;
+ u64 page_start, page_end;
+ struct page *page;
int ret;
- tree = &BTRFS_I(page->mapping->host)->io_tree;
+ index = start >> PAGE_CACHE_SHIFT;
+ end_index = end >> PAGE_CACHE_SHIFT;
- if (tree->ops && tree->ops->writepage_end_io_hook) {
- ret = tree->ops->writepage_end_io_hook(page, start,
- end, NULL, uptodate);
- if (ret)
- uptodate = 0;
+ page_start = start;
+
+ while (index <= end_index) {
+ page = find_get_page(inode->i_mapping, index);
+ BUG_ON(!page);
+
+ page_end = min_t(u64, end, page_offset(page) + PAGE_CACHE_SIZE - 1);
+
+ if (tree->ops && tree->ops->writepage_end_io_hook) {
+ ret = tree->ops->writepage_end_io_hook(page,
+ page_start, page_end,
+ NULL, uptodate);
+ if (ret)
+ uptodate = 0;
+ }
+
+ page_start = page_end + 1;
+
+ ++index;
+
+ if (!uptodate) {
+ ClearPageUptodate(page);
+ SetPageError(page);
+ }
+
+ page_cache_release(page);
}
+}
+
+static void clear_extent_and_page_writeback(struct address_space *mapping,
+ struct extent_io_tree *tree,
+ struct btrfs_io_bio *io_bio)
+{
+ struct page *page;
+ pgoff_t index;
+ u64 offset, len;
- if (!uptodate) {
- ClearPageUptodate(page);
- SetPageError(page);
+ offset = io_bio->start_offset;
+ len = io_bio->len;
+
+ clear_extent_writeback(tree, offset, offset + len - 1, NULL,
+ GFP_ATOMIC);
+
+ index = offset >> PAGE_CACHE_SHIFT;
+ while (offset < io_bio->start_offset + len) {
+ page = find_get_page(mapping, index);
+ check_page_writeback(tree, page);
+ page_cache_release(page);
+ index++;
+ offset += page_offset(page) + PAGE_CACHE_SIZE - offset;
}
- return 0;
}
/*
@@ -2393,41 +2460,14 @@ int end_extent_writepage(struct page *page, int err, u64 start, u64 end)
*/
static void end_bio_extent_writepage(struct bio *bio, int err)
{
- struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1;
- u64 start;
- u64 end;
-
- do {
- struct page *page = bvec->bv_page;
-
- /* We always issue full-page reads, but if some block
- * in a page fails to read, blk_update_request() will
- * advance bv_offset and adjust bv_len to compensate.
- * Print a warning for nonzero offsets, and an error
- * if they don't add up to a full page. */
- if (bvec->bv_offset || bvec->bv_len != PAGE_CACHE_SIZE) {
- if (bvec->bv_offset + bvec->bv_len != PAGE_CACHE_SIZE)
- btrfs_err(BTRFS_I(page->mapping->host)->root->fs_info,
- "partial page write in btrfs with offset %u and length %u",
- bvec->bv_offset, bvec->bv_len);
- else
- btrfs_info(BTRFS_I(page->mapping->host)->root->fs_info,
- "incomplete page write in btrfs with offset %u and "
- "length %u",
- bvec->bv_offset, bvec->bv_len);
- }
-
- start = page_offset(page);
- end = start + bvec->bv_offset + bvec->bv_len - 1;
-
- if (--bvec >= bio->bi_io_vec)
- prefetchw(&bvec->bv_page->flags);
+ struct address_space *mapping = bio->bi_io_vec->bv_page->mapping;
+ struct extent_io_tree *tree = &BTRFS_I(mapping->host)->io_tree;
+ struct btrfs_io_bio *io_bio = btrfs_io_bio(bio);
- if (end_extent_writepage(page, err, start, end))
- continue;
+ end_extents_write(mapping->host, err, io_bio->start_offset,
+ io_bio->start_offset + io_bio->len - 1);
- end_page_writeback(page);
- } while (bvec >= bio->bi_io_vec);
+ clear_extent_and_page_writeback(mapping, tree, io_bio);
bio_put(bio);
}
@@ -3091,6 +3131,7 @@ static int __extent_writepage(struct page *page, struct writeback_control *wbc,
u64 last_byte = i_size_read(inode);
u64 block_start;
u64 iosize;
+ u64 unlock_start = start;
sector_t sector;
struct extent_state *cached_state = NULL;
struct extent_map *em;
@@ -3173,6 +3214,7 @@ static int __extent_writepage(struct page *page, struct writeback_control *wbc,
/* File system has been set read-only */
if (ret) {
SetPageError(page);
+ unlock_start = page_end + 1;
goto done;
}
/*
@@ -3208,10 +3250,14 @@ static int __extent_writepage(struct page *page, struct writeback_control *wbc,
goto done_unlocked;
}
}
+
+ lock_extent(tree, start, page_end);
+
if (tree->ops && tree->ops->writepage_start_hook) {
ret = tree->ops->writepage_start_hook(page, start,
page_end);
if (ret) {
+ unlock_extent(tree, start, page_end);
/* Fixup worker will requeue */
if (ret == -EBUSY)
wbc->pages_skipped++;
@@ -3232,9 +3278,11 @@ static int __extent_writepage(struct page *page, struct writeback_control *wbc,
end = page_end;
if (last_byte <= start) {
+ unlock_extent(tree, start, page_end);
if (tree->ops && tree->ops->writepage_end_io_hook)
tree->ops->writepage_end_io_hook(page, start,
page_end, NULL, 1);
+ unlock_start = page_end + 1;
goto done;
}
@@ -3242,9 +3290,11 @@ static int __extent_writepage(struct page *page, struct writeback_control *wbc,
while (cur <= end) {
if (cur >= last_byte) {
+ unlock_extent(tree, unlock_start, page_end);
if (tree->ops && tree->ops->writepage_end_io_hook)
tree->ops->writepage_end_io_hook(page, cur,
page_end, NULL, 1);
+ unlock_start = page_end + 1;
break;
}
em = epd->get_extent(inode, page, pg_offset, cur,
@@ -3272,6 +3322,7 @@ static int __extent_writepage(struct page *page, struct writeback_control *wbc,
*/
if (compressed || block_start == EXTENT_MAP_HOLE ||
block_start == EXTENT_MAP_INLINE) {
+ unlock_extent(tree, unlock_start, cur + iosize - 1);
/*
* end_io notification does not happen here for
* compressed extents
@@ -3291,6 +3342,7 @@ static int __extent_writepage(struct page *page, struct writeback_control *wbc,
cur += iosize;
pg_offset += iosize;
+ unlock_start = cur;
continue;
}
/* leave this out until we have a page_mkwrite call */
@@ -3337,6 +3389,9 @@ done:
set_page_writeback(page);
end_page_writeback(page);
}
+ if (unlock_start <= page_end)
+ unlock_extent(tree, unlock_start, page_end);
+
unlock_page(page);
done_unlocked:
diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h
index 58b27e5..42d0b74 100644
--- a/fs/btrfs/extent_io.h
+++ b/fs/btrfs/extent_io.h
@@ -341,7 +341,7 @@ struct btrfs_fs_info;
int repair_io_failure(struct btrfs_fs_info *fs_info, u64 start,
u64 length, u64 logical, struct page *page,
int mirror_num);
-int end_extent_writepage(struct page *page, int err, u64 start, u64 end);
+void end_extents_write(struct inode *inode, int err, u64 start, u64 end);
int repair_eb_io_failure(struct btrfs_root *root, struct extent_buffer *eb,
int mirror_num);
#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 8dba152..16da8e3a 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -1797,7 +1797,7 @@ again:
ret = btrfs_delalloc_reserve_space(inode, PAGE_CACHE_SIZE);
if (ret) {
mapping_set_error(page->mapping, ret);
- end_extent_writepage(page, ret, page_start, page_end);
+ end_extents_write(page->mapping->host, ret, page_start, page_end);
ClearPageChecked(page);
goto out;
}
@@ -2766,23 +2766,46 @@ static int btrfs_writepage_end_io_hook(struct page *page, u64 start, u64 end,
struct btrfs_root *root = BTRFS_I(inode)->root;
struct btrfs_ordered_extent *ordered_extent = NULL;
struct btrfs_workers *workers;
+ u64 ordered_start, ordered_end;
+ int done;
trace_btrfs_writepage_end_io_hook(page, start, end, uptodate);
ClearPagePrivate2(page);
- if (!btrfs_dec_test_ordered_pending(inode, &ordered_extent, start,
- end - start + 1, uptodate))
- return 0;
+loop:
+ ordered_extent = btrfs_lookup_ordered_range(inode, start,
+ start + end - 1);
+ if (!ordered_extent)
+ goto out;
- ordered_extent->work.func = finish_ordered_fn;
- ordered_extent->work.flags = 0;
+ ordered_start = max_t(u64, start, ordered_extent->file_offset);
+ ordered_end = min_t(u64, end,
+ ordered_extent->file_offset + ordered_extent->len - 1);
- if (btrfs_is_free_space_inode(inode))
- workers = &root->fs_info->endio_freespace_worker;
- else
- workers = &root->fs_info->endio_write_workers;
- btrfs_queue_worker(workers, &ordered_extent->work);
+ done = btrfs_dec_test_ordered_pending(inode, &ordered_extent,
+ ordered_start,
+ ordered_end - ordered_start + 1,
+ uptodate);
+ if (done) {
+ ordered_extent->work.func = finish_ordered_fn;
+ ordered_extent->work.flags = 0;
+ if (btrfs_is_free_space_inode(inode))
+ workers = &root->fs_info->endio_freespace_worker;
+ else
+ workers = &root->fs_info->endio_write_workers;
+
+ btrfs_queue_worker(workers, &ordered_extent->work);
+ }
+
+ btrfs_put_ordered_extent(ordered_extent);
+
+ start = ordered_end + 1;
+
+ if (start < end)
+ goto loop;
+
+out:
return 0;
}
--
1.8.3.1
^ permalink raw reply related [flat|nested] 9+ messages in thread
* [RFC PATCH V2 3/8] Btrfs: subpagesize-blocksize: __btrfs_buffered_write: Reserve/release extents aligned to block size.
2014-06-11 11:32 [RFC PATCH V2 0/8] Btrfs: Subpagesize-blocksize: Get rid of whole page I/O Chandan Rajendra
2014-06-11 11:32 ` [RFC PATCH V2 1/8] Btrfs: subpagesize-blocksize: Get rid of whole page reads Chandan Rajendra
2014-06-11 11:32 ` [RFC PATCH V2 2/8] Btrfs: subpagesize-blocksize: Get rid of whole page writes Chandan Rajendra
@ 2014-06-11 11:32 ` Chandan Rajendra
2014-06-11 11:32 ` [RFC PATCH V2 4/8] Btrfs: subpagesize-blocksize: Define extent_buffer_head Chandan Rajendra
` (4 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: Chandan Rajendra @ 2014-06-11 11:32 UTC (permalink / raw)
To: clm, jbacik, bo.li.liu, dsterba
Cc: Chandan Rajendra, linux-btrfs, aneesh.kumar
Currently, the code reserves/releases extents in multiples of PAGE_CACHE_SIZE
units. Fix this.
Signed-off-by: Chandan Rajendra <chandan@linux.vnet.ibm.com>
---
fs/btrfs/file.c | 32 ++++++++++++++++++++------------
1 file changed, 20 insertions(+), 12 deletions(-)
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 006af2f..541e227 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -1339,18 +1339,21 @@ fail:
static noinline int
lock_and_cleanup_extent_if_need(struct inode *inode, struct page **pages,
size_t num_pages, loff_t pos,
+ size_t write_bytes,
u64 *lockstart, u64 *lockend,
struct extent_state **cached_state)
{
+ struct btrfs_root *root = BTRFS_I(inode)->root;
u64 start_pos;
u64 last_pos;
int i;
int ret = 0;
- start_pos = pos & ~((u64)PAGE_CACHE_SIZE - 1);
- last_pos = start_pos + ((u64)num_pages << PAGE_CACHE_SHIFT) - 1;
+ start_pos = pos & ~((u64)root->sectorsize - 1);
+ last_pos = start_pos
+ + ALIGN(pos + write_bytes - start_pos, root->sectorsize) - 1;
- if (start_pos < inode->i_size) {
+ if (start_pos < inode->i_size) {
struct btrfs_ordered_extent *ordered;
lock_extent_bits(&BTRFS_I(inode)->io_tree,
start_pos, last_pos, 0, cached_state);
@@ -1468,6 +1471,7 @@ static noinline ssize_t __btrfs_buffered_write(struct file *file,
while (iov_iter_count(i) > 0) {
size_t offset = pos & (PAGE_CACHE_SIZE - 1);
+ size_t sector_offset;
size_t write_bytes = min(iov_iter_count(i),
nrptrs * (size_t)PAGE_CACHE_SIZE -
offset);
@@ -1488,7 +1492,9 @@ static noinline ssize_t __btrfs_buffered_write(struct file *file,
break;
}
- reserve_bytes = num_pages << PAGE_CACHE_SHIFT;
+ sector_offset = pos & (root->sectorsize - 1);
+ reserve_bytes = ALIGN(write_bytes + sector_offset, root->sectorsize);
+
ret = btrfs_check_data_free_space(inode, reserve_bytes);
if (ret == -ENOSPC &&
(BTRFS_I(inode)->flags & (BTRFS_INODE_NODATACOW |
@@ -1503,7 +1509,9 @@ static noinline ssize_t __btrfs_buffered_write(struct file *file,
num_pages = (write_bytes + offset +
PAGE_CACHE_SIZE - 1) >>
PAGE_CACHE_SHIFT;
- reserve_bytes = num_pages << PAGE_CACHE_SHIFT;
+
+ reserve_bytes = ALIGN(write_bytes + sector_offset,
+ root->sectorsize);
ret = 0;
} else {
ret = -ENOSPC;
@@ -1536,8 +1544,8 @@ again:
break;
ret = lock_and_cleanup_extent_if_need(inode, pages, num_pages,
- pos, &lockstart, &lockend,
- &cached_state);
+ pos, write_bytes, &lockstart, &lockend,
+ &cached_state);
if (ret < 0) {
if (ret == -EAGAIN)
goto again;
@@ -1574,9 +1582,9 @@ again:
* we still have an outstanding extent for the chunk we actually
* managed to copy.
*/
- if (num_pages > dirty_pages) {
- release_bytes = (num_pages - dirty_pages) <<
- PAGE_CACHE_SHIFT;
+ if (write_bytes > copied) {
+ release_bytes = (write_bytes - copied)
+ & ~((u64)root->sectorsize - 1);
if (copied > 0) {
spin_lock(&BTRFS_I(inode)->lock);
BTRFS_I(inode)->outstanding_extents++;
@@ -1590,7 +1598,7 @@ again:
release_bytes);
}
- release_bytes = dirty_pages << PAGE_CACHE_SHIFT;
+ release_bytes = ALIGN(copied + sector_offset, root->sectorsize);
if (copied > 0)
ret = btrfs_dirty_pages(root, inode, pages,
@@ -1609,7 +1617,7 @@ again:
if (only_release_metadata && copied > 0) {
u64 lockstart = round_down(pos, root->sectorsize);
u64 lockend = lockstart +
- (dirty_pages << PAGE_CACHE_SHIFT) - 1;
+ ALIGN(copied, root->sectorsize) - 1;
set_extent_bit(&BTRFS_I(inode)->io_tree, lockstart,
lockend, EXTENT_NORESERVE, NULL,
--
1.8.3.1
^ permalink raw reply related [flat|nested] 9+ messages in thread
* [RFC PATCH V2 4/8] Btrfs: subpagesize-blocksize: Define extent_buffer_head.
2014-06-11 11:32 [RFC PATCH V2 0/8] Btrfs: Subpagesize-blocksize: Get rid of whole page I/O Chandan Rajendra
` (2 preceding siblings ...)
2014-06-11 11:32 ` [RFC PATCH V2 3/8] Btrfs: subpagesize-blocksize: __btrfs_buffered_write: Reserve/release extents aligned to block size Chandan Rajendra
@ 2014-06-11 11:32 ` Chandan Rajendra
2014-06-11 11:32 ` [RFC PATCH V2 5/8] Btrfs: subpagesize-blocksize: Read tree blocks whose size is <PAGE_CACHE_SIZE Chandan Rajendra
` (3 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: Chandan Rajendra @ 2014-06-11 11:32 UTC (permalink / raw)
To: clm, jbacik, bo.li.liu, dsterba
Cc: Chandra Seetharaman, linux-btrfs, aneesh.kumar, Chandan Rajendra
From: Chandra Seetharaman <sekharan@us.ibm.com>
In order to handle multiple extent buffers per page, first we need to create a
way to handle all the extent buffers that are attached to a page.
This patch creates a new data structure 'struct extent_buffer_head', and moves
fields that are common to all extent buffers in a page from 'struct extent
buffer' to 'struct extent_buffer_head'
Also, this patch moves EXTENT_BUFFER_TREE_REF, EXTENT_BUFFER_DUMMY and
EXTENT_BUFFER_IN_TREE flags from extent_buffer->ebflags to
extent_buffer_head->bflags.
Signed-off-by: Chandra Seetharaman <sekharan@us.ibm.com>
Signed-off-by: Chandan Rajendra <chandan@linux.vnet.ibm.com>
---
fs/btrfs/backref.c | 2 +-
fs/btrfs/ctree.c | 2 +-
fs/btrfs/ctree.h | 6 +-
fs/btrfs/disk-io.c | 46 ++++--
fs/btrfs/extent-tree.c | 6 +-
fs/btrfs/extent_io.c | 372 +++++++++++++++++++++++++++++--------------
fs/btrfs/extent_io.h | 46 ++++--
fs/btrfs/volumes.c | 2 +-
include/trace/events/btrfs.h | 2 +-
9 files changed, 326 insertions(+), 158 deletions(-)
diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c
index a88da72..603ae44 100644
--- a/fs/btrfs/backref.c
+++ b/fs/btrfs/backref.c
@@ -1272,7 +1272,7 @@ char *btrfs_ref_to_path(struct btrfs_root *fs_root, struct btrfs_path *path,
eb = path->nodes[0];
/* make sure we can use eb after releasing the path */
if (eb != eb_in) {
- atomic_inc(&eb->refs);
+ atomic_inc(&eb_head(eb)->refs);
btrfs_tree_read_lock(eb);
btrfs_set_lock_blocking_rw(eb, BTRFS_READ_LOCK);
}
diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index cbd3a7d..0d4ad91 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -169,7 +169,7 @@ struct extent_buffer *btrfs_root_node(struct btrfs_root *root)
* the inc_not_zero dance and if it doesn't work then
* synchronize_rcu and try again.
*/
- if (atomic_inc_not_zero(&eb->refs)) {
+ if (atomic_inc_not_zero(&eb_head(eb)->refs)) {
rcu_read_unlock();
break;
}
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index dac6653..901ada2 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -2138,14 +2138,16 @@ static inline void btrfs_set_token_##name(struct extent_buffer *eb, \
#define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \
static inline u##bits btrfs_##name(struct extent_buffer *eb) \
{ \
- type *p = page_address(eb->pages[0]); \
+ type *p = page_address(eb_head(eb)->pages[0]) + \
+ (eb->start & (PAGE_CACHE_SIZE -1)); \
u##bits res = le##bits##_to_cpu(p->member); \
return res; \
} \
static inline void btrfs_set_##name(struct extent_buffer *eb, \
u##bits val) \
{ \
- type *p = page_address(eb->pages[0]); \
+ type *p = page_address(eb_head(eb)->pages[0]) + \
+ (eb->start & (PAGE_CACHE_SIZE -1)); \
p->member = cpu_to_le##bits(val); \
}
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index cc1b423..bda2157 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -1018,13 +1018,21 @@ static int btree_set_page_dirty(struct page *page)
{
#ifdef DEBUG
struct extent_buffer *eb;
+ int i, dirty = 0;
BUG_ON(!PagePrivate(page));
eb = (struct extent_buffer *)page->private;
BUG_ON(!eb);
- BUG_ON(!test_bit(EXTENT_BUFFER_DIRTY, &eb->bflags));
- BUG_ON(!atomic_read(&eb->refs));
- btrfs_assert_tree_locked(eb);
+
+ do {
+ dirty = test_bit(EXTENT_BUFFER_DIRTY, &eb->ebflags);
+ if (dirty)
+ break;
+ } while ((eb = eb->eb_next) != NULL);
+
+ BUG_ON(!dirty);
+ BUG_ON(!atomic_read(&(eb_head(eb)->refs)));
+ btrfs_assert_tree_locked(&ebh->eb);
#endif
return __set_page_dirty_nobuffers(page);
}
@@ -1068,7 +1076,7 @@ int reada_tree_block_flagged(struct btrfs_root *root, u64 bytenr, u32 blocksize,
if (!buf)
return 0;
- set_bit(EXTENT_BUFFER_READAHEAD, &buf->bflags);
+ set_bit(EXTENT_BUFFER_READAHEAD, &buf->ebflags);
ret = read_extent_buffer_pages(io_tree, buf, 0, WAIT_PAGE_LOCK,
btree_get_extent, mirror_num);
@@ -1077,7 +1085,7 @@ int reada_tree_block_flagged(struct btrfs_root *root, u64 bytenr, u32 blocksize,
return ret;
}
- if (test_bit(EXTENT_BUFFER_CORRUPT, &buf->bflags)) {
+ if (test_bit(EXTENT_BUFFER_CORRUPT, &buf->ebflags)) {
free_extent_buffer(buf);
return -EIO;
} else if (extent_buffer_uptodate(buf)) {
@@ -1103,14 +1111,16 @@ struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root,
int btrfs_write_tree_block(struct extent_buffer *buf)
{
- return filemap_fdatawrite_range(buf->pages[0]->mapping, buf->start,
+ return filemap_fdatawrite_range(eb_head(buf)->pages[0]->mapping,
+ buf->start,
buf->start + buf->len - 1);
}
int btrfs_wait_tree_block_writeback(struct extent_buffer *buf)
{
- return filemap_fdatawait_range(buf->pages[0]->mapping,
- buf->start, buf->start + buf->len - 1);
+ return filemap_fdatawait_range(eb_head(buf)->pages[0]->mapping,
+ buf->start,
+ buf->start + buf->len - 1);
}
struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
@@ -1141,7 +1151,8 @@ void clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
fs_info->running_transaction->transid) {
btrfs_assert_tree_locked(buf);
- if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &buf->bflags)) {
+ if (test_and_clear_bit(EXTENT_BUFFER_DIRTY,
+ &buf->ebflags)) {
__percpu_counter_add(&fs_info->dirty_metadata_bytes,
-buf->len,
fs_info->dirty_metadata_batch);
@@ -2613,7 +2624,8 @@ int open_ctree(struct super_block *sb,
btrfs_super_chunk_root(disk_super),
blocksize, generation);
if (!chunk_root->node ||
- !test_bit(EXTENT_BUFFER_UPTODATE, &chunk_root->node->bflags)) {
+ !test_bit(EXTENT_BUFFER_UPTODATE,
+ &chunk_root->node->ebflags)) {
printk(KERN_WARNING "BTRFS: failed to read chunk root on %s\n",
sb->s_id);
goto fail_tree_roots;
@@ -2652,7 +2664,8 @@ retry_root_backup:
btrfs_super_root(disk_super),
blocksize, generation);
if (!tree_root->node ||
- !test_bit(EXTENT_BUFFER_UPTODATE, &tree_root->node->bflags)) {
+ !test_bit(EXTENT_BUFFER_UPTODATE,
+ &tree_root->node->ebflags)) {
printk(KERN_WARNING "BTRFS: failed to read tree root on %s\n",
sb->s_id);
@@ -3642,7 +3655,7 @@ int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid,
int atomic)
{
int ret;
- struct inode *btree_inode = buf->pages[0]->mapping->host;
+ struct inode *btree_inode = eb_head(buf)->pages[0]->mapping->host;
ret = extent_buffer_uptodate(buf);
if (!ret)
@@ -3672,10 +3685,10 @@ void btrfs_mark_buffer_dirty(struct extent_buffer *buf)
* enabled. Normal people shouldn't be marking dummy buffers as dirty
* outside of the sanity tests.
*/
- if (unlikely(test_bit(EXTENT_BUFFER_DUMMY, &buf->bflags)))
+ if (unlikely(test_bit(EXTENT_BUFFER_DUMMY, &eb_head(buf)->bflags)))
return;
#endif
- root = BTRFS_I(buf->pages[0]->mapping->host)->root;
+ root = BTRFS_I(eb_head(buf)->pages[0]->mapping->host)->root;
btrfs_assert_tree_locked(buf);
if (transid != root->fs_info->generation)
WARN(1, KERN_CRIT "btrfs transid mismatch buffer %llu, "
@@ -3724,7 +3737,8 @@ void btrfs_btree_balance_dirty_nodelay(struct btrfs_root *root)
int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid)
{
- struct btrfs_root *root = BTRFS_I(buf->pages[0]->mapping->host)->root;
+ struct btrfs_root *root =
+ BTRFS_I(eb_head(buf)->pages[0]->mapping->host)->root;
return btree_read_extent_buffer_pages(root, buf, 0, parent_transid);
}
@@ -3962,7 +3976,7 @@ static int btrfs_destroy_marked_extents(struct btrfs_root *root,
wait_on_extent_buffer_writeback(eb);
if (test_and_clear_bit(EXTENT_BUFFER_DIRTY,
- &eb->bflags))
+ &eb->ebflags))
clear_extent_buffer_dirty(eb);
free_extent_buffer_stale(eb);
}
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 32312e0..232d0a3 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -5984,7 +5984,7 @@ void btrfs_free_tree_block(struct btrfs_trans_handle *trans,
goto out;
}
- WARN_ON(test_bit(EXTENT_BUFFER_DIRTY, &buf->bflags));
+ WARN_ON(test_bit(EXTENT_BUFFER_DIRTY, &buf->ebflags));
btrfs_add_free_space(cache, buf->start, buf->len);
btrfs_update_reserved_bytes(cache, buf->len, RESERVE_FREE);
@@ -6001,7 +6001,7 @@ out:
* Deleting the buffer, clear the corrupt flag since it doesn't matter
* anymore.
*/
- clear_bit(EXTENT_BUFFER_CORRUPT, &buf->bflags);
+ clear_bit(EXTENT_BUFFER_CORRUPT, &buf->ebflags);
btrfs_put_block_group(cache);
}
@@ -6887,7 +6887,7 @@ btrfs_init_new_buffer(struct btrfs_trans_handle *trans, struct btrfs_root *root,
btrfs_set_buffer_lockdep_class(root->root_key.objectid, buf, level);
btrfs_tree_lock(buf);
clean_tree_block(trans, root, buf);
- clear_bit(EXTENT_BUFFER_STALE, &buf->bflags);
+ clear_bit(EXTENT_BUFFER_STALE, &buf->ebflags);
btrfs_set_lock_blocking(buf);
btrfs_set_buffer_uptodate(buf);
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 20d8bdc..fdc06a6 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -56,6 +56,7 @@ void btrfs_leak_debug_check(void)
{
struct extent_state *state;
struct extent_buffer *eb;
+ struct extent_buffer_head *ebh;
while (!list_empty(&states)) {
state = list_entry(states.next, struct extent_state, leak_list);
@@ -68,12 +69,17 @@ void btrfs_leak_debug_check(void)
}
while (!list_empty(&buffers)) {
- eb = list_entry(buffers.next, struct extent_buffer, leak_list);
- printk(KERN_ERR "BTRFS: buffer leak start %llu len %lu "
- "refs %d\n",
- eb->start, eb->len, atomic_read(&eb->refs));
- list_del(&eb->leak_list);
- kmem_cache_free(extent_buffer_cache, eb);
+ ebh = list_entry(buffers.next, struct extent_buffer_head, leak_list);
+ printk(KERN_ERR "btrfs buffer leak ");
+
+ eb = &ebh->eb;
+ do {
+ printk(KERN_ERR "eb %p %llu:%lu ", eb, eb->start, eb->len);
+ } while ((eb = eb->eb_next) != NULL);
+
+ printk(KERN_ERR "refs %d\n", atomic_read(&ebh->refs));
+ list_del(&ebh->leak_list);
+ kmem_cache_free(extent_buffer_cache, ebh);
}
}
@@ -144,7 +150,7 @@ int __init extent_io_init(void)
return -ENOMEM;
extent_buffer_cache = kmem_cache_create("btrfs_extent_buffer",
- sizeof(struct extent_buffer), 0,
+ sizeof(struct extent_buffer_head), 0,
SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL);
if (!extent_buffer_cache)
goto free_state_cache;
@@ -3409,7 +3415,7 @@ static int eb_wait(void *word)
void wait_on_extent_buffer_writeback(struct extent_buffer *eb)
{
- wait_on_bit(&eb->bflags, EXTENT_BUFFER_WRITEBACK, eb_wait,
+ wait_on_bit(&eb->ebflags, EXTENT_BUFFER_WRITEBACK, eb_wait,
TASK_UNINTERRUPTIBLE);
}
@@ -4335,29 +4341,47 @@ out:
return ret;
}
-static void __free_extent_buffer(struct extent_buffer *eb)
+static void __free_extent_buffer(struct extent_buffer_head *ebh)
{
- btrfs_leak_debug_del(&eb->leak_list);
- kmem_cache_free(extent_buffer_cache, eb);
+ struct extent_buffer *eb, *next_eb;
+
+ btrfs_leak_debug_del(&ebh->leak_list);
+
+ eb = ebh->eb.eb_next;
+ while (eb) {
+ next_eb = eb->eb_next;
+ kfree(eb);
+ eb = next_eb;
+ }
+
+ kmem_cache_free(extent_buffer_cache, ebh);
}
static int extent_buffer_under_io(struct extent_buffer *eb)
{
- return (atomic_read(&eb->io_pages) ||
- test_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags) ||
- test_bit(EXTENT_BUFFER_DIRTY, &eb->bflags));
+ struct extent_buffer_head *ebh = eb->ebh;
+ int dirty_or_writeback = 0;
+
+ for (eb = &ebh->eb; eb; eb = eb->eb_next) {
+ if (test_bit(EXTENT_BUFFER_WRITEBACK, &eb->ebflags)
+ || test_bit(EXTENT_BUFFER_DIRTY, &eb->ebflags))
+ dirty_or_writeback = 1;
+ }
+
+ return (atomic_read(&ebh->io_bvecs) || dirty_or_writeback);
}
/*
* Helper for releasing extent buffer page.
*/
-static void btrfs_release_extent_buffer_page(struct extent_buffer *eb,
+static noinline void btrfs_release_extent_buffer_page(struct extent_buffer *eb,
unsigned long start_idx)
{
unsigned long index;
unsigned long num_pages;
struct page *page;
- int mapped = !test_bit(EXTENT_BUFFER_DUMMY, &eb->bflags);
+ struct extent_buffer_head *ebh = eb_head(eb);
+ int mapped = !test_bit(EXTENT_BUFFER_DUMMY, &ebh->bflags);
BUG_ON(extent_buffer_under_io(eb));
@@ -4367,6 +4391,8 @@ static void btrfs_release_extent_buffer_page(struct extent_buffer *eb,
return;
do {
+ struct extent_buffer *e;
+
index--;
page = extent_buffer_page(eb, index);
if (page && mapped) {
@@ -4379,8 +4405,10 @@ static void btrfs_release_extent_buffer_page(struct extent_buffer *eb,
* this eb.
*/
if (PagePrivate(page) &&
- page->private == (unsigned long)eb) {
- BUG_ON(test_bit(EXTENT_BUFFER_DIRTY, &eb->bflags));
+ page->private == (unsigned long)(&ebh->eb)) {
+ for (e = &ebh->eb; !e; e = e->eb_next)
+ BUG_ON(test_bit(EXTENT_BUFFER_DIRTY,
+ &e->ebflags));
BUG_ON(PageDirty(page));
BUG_ON(PageWriteback(page));
/*
@@ -4408,22 +4436,18 @@ static void btrfs_release_extent_buffer_page(struct extent_buffer *eb,
static inline void btrfs_release_extent_buffer(struct extent_buffer *eb)
{
btrfs_release_extent_buffer_page(eb, 0);
- __free_extent_buffer(eb);
+ __free_extent_buffer(eb_head(eb));
}
-static struct extent_buffer *
-__alloc_extent_buffer(struct btrfs_fs_info *fs_info, u64 start,
- unsigned long len, gfp_t mask)
+static void __init_extent_buffer(struct extent_buffer *eb,
+ struct extent_buffer_head *ebh,
+ u64 start,
+ unsigned long len)
{
- struct extent_buffer *eb = NULL;
-
- eb = kmem_cache_zalloc(extent_buffer_cache, mask);
- if (eb == NULL)
- return NULL;
eb->start = start;
eb->len = len;
- eb->fs_info = fs_info;
- eb->bflags = 0;
+ eb->ebh = ebh;
+ eb->eb_next = NULL;
rwlock_init(&eb->lock);
atomic_set(&eb->write_locks, 0);
atomic_set(&eb->read_locks, 0);
@@ -4434,12 +4458,26 @@ __alloc_extent_buffer(struct btrfs_fs_info *fs_info, u64 start,
eb->lock_nested = 0;
init_waitqueue_head(&eb->write_lock_wq);
init_waitqueue_head(&eb->read_lock_wq);
+}
+
+static struct extent_buffer *__alloc_extent_buffer(struct btrfs_fs_info *fs_info,
+ u64 start, unsigned long len,
+ gfp_t mask)
+{
+ struct extent_buffer_head *ebh = NULL;
+ struct extent_buffer *eb = NULL;
+ int i;
- btrfs_leak_debug_add(&eb->leak_list, &buffers);
+ ebh = kmem_cache_zalloc(extent_buffer_cache, mask);
+ if (ebh == NULL)
+ return NULL;
+ ebh->fs_info = fs_info;
+ ebh->bflags = 0;
+ btrfs_leak_debug_add(&ebh->leak_list, &buffers);
- spin_lock_init(&eb->refs_lock);
- atomic_set(&eb->refs, 1);
- atomic_set(&eb->io_pages, 0);
+ spin_lock_init(&ebh->refs_lock);
+ atomic_set(&ebh->refs, 1);
+ atomic_set(&ebh->io_bvecs, 0);
/*
* Sanity checks, currently the maximum is 64k covered by 16x 4k pages
@@ -4448,6 +4486,29 @@ __alloc_extent_buffer(struct btrfs_fs_info *fs_info, u64 start,
> MAX_INLINE_EXTENT_BUFFER_SIZE);
BUG_ON(len > MAX_INLINE_EXTENT_BUFFER_SIZE);
+ if (len < PAGE_CACHE_SIZE) {
+ struct extent_buffer *cur_eb, *prev_eb;
+ int ebs_per_page = PAGE_CACHE_SIZE / len;
+ u64 st = start & ~(PAGE_CACHE_SIZE - 1);
+
+ prev_eb = NULL;
+ cur_eb = &ebh->eb;
+ for (i = 0; i < ebs_per_page; i++, st += len) {
+ if (prev_eb) {
+ cur_eb = kzalloc(sizeof(*eb), mask);
+ prev_eb->eb_next = cur_eb;
+ }
+ __init_extent_buffer(cur_eb, ebh, st, len);
+ prev_eb = cur_eb;
+ if (st == start)
+ eb = cur_eb;
+ }
+ BUG_ON(!eb);
+ } else {
+ eb = &ebh->eb;
+ __init_extent_buffer(eb, ebh, start, len);
+ }
+
return eb;
}
@@ -4468,15 +4529,16 @@ struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src)
btrfs_release_extent_buffer(new);
return NULL;
}
- attach_extent_buffer_page(new, p);
+ attach_extent_buffer_page(&(eb_head(new)->eb), p);
WARN_ON(PageDirty(p));
SetPageUptodate(p);
- new->pages[i] = p;
+ eb_head(new)->pages[i] = p;
}
+ set_bit(EXTENT_BUFFER_UPTODATE, &new->ebflags);
+ set_bit(EXTENT_BUFFER_DUMMY, &eb_head(new)->bflags);
+
copy_extent_buffer(new, src, 0, 0, src->len);
- set_bit(EXTENT_BUFFER_UPTODATE, &new->bflags);
- set_bit(EXTENT_BUFFER_DUMMY, &new->bflags);
return new;
}
@@ -4492,19 +4554,19 @@ struct extent_buffer *alloc_dummy_extent_buffer(u64 start, unsigned long len)
return NULL;
for (i = 0; i < num_pages; i++) {
- eb->pages[i] = alloc_page(GFP_NOFS);
- if (!eb->pages[i])
+ eb_head(eb)->pages[i] = alloc_page(GFP_NOFS);
+ if (!eb_head(eb)->pages[i])
goto err;
}
set_extent_buffer_uptodate(eb);
btrfs_set_header_nritems(eb, 0);
- set_bit(EXTENT_BUFFER_DUMMY, &eb->bflags);
+ set_bit(EXTENT_BUFFER_DUMMY, &eb_head(eb)->bflags);
return eb;
err:
for (; i > 0; i--)
- __free_page(eb->pages[i - 1]);
- __free_extent_buffer(eb);
+ __free_page(eb_head(eb)->pages[i - 1]);
+ __free_extent_buffer(eb_head(eb));
return NULL;
}
@@ -4531,14 +4593,15 @@ static void check_buffer_tree_ref(struct extent_buffer *eb)
* So bump the ref count first, then set the bit. If someone
* beat us to it, drop the ref we added.
*/
- refs = atomic_read(&eb->refs);
- if (refs >= 2 && test_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags))
+ refs = atomic_read(&eb_head(eb)->refs);
+ if (refs >= 2 && test_bit(EXTENT_BUFFER_TREE_REF,
+ &eb_head(eb)->bflags))
return;
- spin_lock(&eb->refs_lock);
- if (!test_and_set_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags))
- atomic_inc(&eb->refs);
- spin_unlock(&eb->refs_lock);
+ spin_lock(&eb_head(eb)->refs_lock);
+ if (!test_and_set_bit(EXTENT_BUFFER_TREE_REF, &eb_head(eb)->bflags))
+ atomic_inc(&eb_head(eb)->refs);
+ spin_unlock(&eb_head(eb)->refs_lock);
}
static void mark_extent_buffer_accessed(struct extent_buffer *eb)
@@ -4557,15 +4620,24 @@ static void mark_extent_buffer_accessed(struct extent_buffer *eb)
struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info,
u64 start)
{
+ struct extent_buffer_head *ebh;
struct extent_buffer *eb;
rcu_read_lock();
- eb = radix_tree_lookup(&fs_info->buffer_radix,
- start >> PAGE_CACHE_SHIFT);
- if (eb && atomic_inc_not_zero(&eb->refs)) {
+ ebh = radix_tree_lookup(&fs_info->buffer_radix,
+ start >> PAGE_CACHE_SHIFT);
+ if (ebh && atomic_inc_not_zero(&ebh->refs)) {
rcu_read_unlock();
- mark_extent_buffer_accessed(eb);
- return eb;
+
+ eb = &ebh->eb;
+ do {
+ if (eb->start == start) {
+ mark_extent_buffer_accessed(eb);
+ return eb;
+ }
+ } while ((eb = eb->eb_next) != NULL);
+
+ BUG();
}
rcu_read_unlock();
@@ -4578,7 +4650,7 @@ struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
unsigned long num_pages = num_extent_pages(start, len);
unsigned long i;
unsigned long index = start >> PAGE_CACHE_SHIFT;
- struct extent_buffer *eb;
+ struct extent_buffer *eb, *cur_eb;
struct extent_buffer *exists = NULL;
struct page *p;
struct address_space *mapping = fs_info->btree_inode->i_mapping;
@@ -4608,12 +4680,18 @@ struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
* overwrite page->private.
*/
exists = (struct extent_buffer *)p->private;
- if (atomic_inc_not_zero(&exists->refs)) {
+ if (atomic_inc_not_zero(&eb_head(exists)->refs)) {
spin_unlock(&mapping->private_lock);
unlock_page(p);
page_cache_release(p);
- mark_extent_buffer_accessed(exists);
- goto free_eb;
+ do {
+ if (exists->start == start) {
+ mark_extent_buffer_accessed(exists);
+ goto free_eb;
+ }
+ } while ((exists = exists->eb_next) != NULL);
+
+ BUG();
}
/*
@@ -4624,11 +4702,11 @@ struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
WARN_ON(PageDirty(p));
page_cache_release(p);
}
- attach_extent_buffer_page(eb, p);
+ attach_extent_buffer_page(&(eb_head(eb)->eb), p);
spin_unlock(&mapping->private_lock);
WARN_ON(PageDirty(p));
mark_page_accessed(p);
- eb->pages[i] = p;
+ eb_head(eb)->pages[i] = p;
if (!PageUptodate(p))
uptodate = 0;
@@ -4637,16 +4715,22 @@ struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info,
* and why we unlock later
*/
}
- if (uptodate)
- set_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags);
+ if (uptodate) {
+ cur_eb = &(eb_head(eb)->eb);
+ do {
+ set_bit(EXTENT_BUFFER_UPTODATE, &cur_eb->ebflags);
+ } while ((cur_eb = cur_eb->eb_next) != NULL);
+ }
again:
ret = radix_tree_preload(GFP_NOFS & ~__GFP_HIGHMEM);
- if (ret)
+ if (ret) {
+ exists = NULL;
goto free_eb;
+ }
spin_lock(&fs_info->buffer_lock);
ret = radix_tree_insert(&fs_info->buffer_radix,
- start >> PAGE_CACHE_SHIFT, eb);
+ start >> PAGE_CACHE_SHIFT, eb_head(eb));
spin_unlock(&fs_info->buffer_lock);
radix_tree_preload_end();
if (ret == -EEXIST) {
@@ -4658,7 +4742,7 @@ again:
}
/* add one reference for the tree */
check_buffer_tree_ref(eb);
- set_bit(EXTENT_BUFFER_IN_TREE, &eb->bflags);
+ set_bit(EXTENT_BUFFER_IN_TREE, &eb_head(eb)->bflags);
/*
* there is a race where release page may have
@@ -4669,108 +4753,125 @@ again:
* after the extent buffer is in the radix tree so
* it doesn't get lost
*/
- SetPageChecked(eb->pages[0]);
+ SetPageChecked(eb_head(eb)->pages[0]);
for (i = 1; i < num_pages; i++) {
p = extent_buffer_page(eb, i);
ClearPageChecked(p);
unlock_page(p);
}
- unlock_page(eb->pages[0]);
+ unlock_page(eb_head(eb)->pages[0]);
return eb;
free_eb:
for (i = 0; i < num_pages; i++) {
- if (eb->pages[i])
- unlock_page(eb->pages[i]);
+ if (eb_head(eb)->pages[i])
+ unlock_page(eb_head(eb)->pages[i]);
}
- WARN_ON(!atomic_dec_and_test(&eb->refs));
+ WARN_ON(!atomic_dec_and_test(&eb_head(eb)->refs));
btrfs_release_extent_buffer(eb);
return exists;
}
static inline void btrfs_release_extent_buffer_rcu(struct rcu_head *head)
{
- struct extent_buffer *eb =
- container_of(head, struct extent_buffer, rcu_head);
+ struct extent_buffer_head *ebh =
+ container_of(head, struct extent_buffer_head, rcu_head);
- __free_extent_buffer(eb);
+ __free_extent_buffer(ebh);
}
/* Expects to have eb->eb_lock already held */
-static int release_extent_buffer(struct extent_buffer *eb)
+static int release_extent_buffer(struct extent_buffer_head *ebh)
{
- WARN_ON(atomic_read(&eb->refs) == 0);
- if (atomic_dec_and_test(&eb->refs)) {
- if (test_and_clear_bit(EXTENT_BUFFER_IN_TREE, &eb->bflags)) {
- struct btrfs_fs_info *fs_info = eb->fs_info;
+ WARN_ON(atomic_read(&ebh->refs) == 0);
+ if (atomic_dec_and_test(&ebh->refs)) {
+ if (test_and_clear_bit(EXTENT_BUFFER_IN_TREE, &ebh->bflags)) {
+ struct btrfs_fs_info *fs_info = ebh->fs_info;
- spin_unlock(&eb->refs_lock);
+ spin_unlock(&ebh->refs_lock);
spin_lock(&fs_info->buffer_lock);
radix_tree_delete(&fs_info->buffer_radix,
- eb->start >> PAGE_CACHE_SHIFT);
+ ebh->eb.start >> PAGE_CACHE_SHIFT);
spin_unlock(&fs_info->buffer_lock);
} else {
- spin_unlock(&eb->refs_lock);
+ spin_unlock(&ebh->refs_lock);
}
/* Should be safe to release our pages at this point */
- btrfs_release_extent_buffer_page(eb, 0);
- call_rcu(&eb->rcu_head, btrfs_release_extent_buffer_rcu);
+ btrfs_release_extent_buffer_page(&ebh->eb, 0);
+ call_rcu(&ebh->rcu_head, btrfs_release_extent_buffer_rcu);
return 1;
}
- spin_unlock(&eb->refs_lock);
+ spin_unlock(&ebh->refs_lock);
return 0;
}
void free_extent_buffer(struct extent_buffer *eb)
{
+ struct extent_buffer_head *ebh;
int refs;
int old;
if (!eb)
return;
+ ebh = eb_head(eb);
while (1) {
- refs = atomic_read(&eb->refs);
+ refs = atomic_read(&ebh->refs);
if (refs <= 3)
break;
- old = atomic_cmpxchg(&eb->refs, refs, refs - 1);
+ old = atomic_cmpxchg(&ebh->refs, refs, refs - 1);
if (old == refs)
return;
}
- spin_lock(&eb->refs_lock);
- if (atomic_read(&eb->refs) == 2 &&
- test_bit(EXTENT_BUFFER_DUMMY, &eb->bflags))
- atomic_dec(&eb->refs);
+ spin_lock(&ebh->refs_lock);
+ if (atomic_read(&ebh->refs) == 2 &&
+ test_bit(EXTENT_BUFFER_DUMMY, &ebh->bflags))
+ atomic_dec(&ebh->refs);
- if (atomic_read(&eb->refs) == 2 &&
- test_bit(EXTENT_BUFFER_STALE, &eb->bflags) &&
+ if (atomic_read(&ebh->refs) == 2 &&
+ test_bit(EXTENT_BUFFER_STALE, &eb->ebflags) &&
!extent_buffer_under_io(eb) &&
- test_and_clear_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags))
- atomic_dec(&eb->refs);
+ test_and_clear_bit(EXTENT_BUFFER_TREE_REF, &ebh->bflags))
+ atomic_dec(&ebh->refs);
/*
* I know this is terrible, but it's temporary until we stop tracking
* the uptodate bits and such for the extent buffers.
*/
- release_extent_buffer(eb);
+ release_extent_buffer(ebh);
}
void free_extent_buffer_stale(struct extent_buffer *eb)
{
+ struct extent_buffer_head *ebh;
if (!eb)
return;
- spin_lock(&eb->refs_lock);
- set_bit(EXTENT_BUFFER_STALE, &eb->bflags);
+ ebh = eb_head(eb);
+ spin_lock(&ebh->refs_lock);
+
+ set_bit(EXTENT_BUFFER_STALE, &eb->ebflags);
+ if (atomic_read(&ebh->refs) == 2 && !extent_buffer_under_io(eb) &&
+ test_and_clear_bit(EXTENT_BUFFER_TREE_REF, &ebh->bflags))
+ atomic_dec(&ebh->refs);
+
+ release_extent_buffer(ebh);
+}
+
+static int page_ebs_clean(struct extent_buffer_head *ebh)
+{
+ struct extent_buffer *eb = &ebh->eb;;
+
+ do {
+ if (test_bit(EXTENT_BUFFER_DIRTY, &eb->ebflags))
+ return 0;
+ } while ((eb = eb->eb_next) != NULL);
- if (atomic_read(&eb->refs) == 2 && !extent_buffer_under_io(eb) &&
- test_and_clear_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags))
- atomic_dec(&eb->refs);
- release_extent_buffer(eb);
+ return 1;
}
void clear_extent_buffer_dirty(struct extent_buffer *eb)
@@ -4781,6 +4882,9 @@ void clear_extent_buffer_dirty(struct extent_buffer *eb)
num_pages = num_extent_pages(eb->start, eb->len);
+ if (eb->len < PAGE_CACHE_SIZE && !page_ebs_clean(eb_head(eb)))
+ return;
+
for (i = 0; i < num_pages; i++) {
page = extent_buffer_page(eb, i);
if (!PageDirty(page))
@@ -4800,7 +4904,7 @@ void clear_extent_buffer_dirty(struct extent_buffer *eb)
ClearPageError(page);
unlock_page(page);
}
- WARN_ON(atomic_read(&eb->refs) == 0);
+ WARN_ON(atomic_read(&eb_head(eb)->refs) == 0);
}
int set_extent_buffer_dirty(struct extent_buffer *eb)
@@ -4811,11 +4915,11 @@ int set_extent_buffer_dirty(struct extent_buffer *eb)
check_buffer_tree_ref(eb);
- was_dirty = test_and_set_bit(EXTENT_BUFFER_DIRTY, &eb->bflags);
+ was_dirty = test_and_set_bit(EXTENT_BUFFER_DIRTY, &eb->ebflags);
num_pages = num_extent_pages(eb->start, eb->len);
- WARN_ON(atomic_read(&eb->refs) == 0);
- WARN_ON(!test_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags));
+ WARN_ON(atomic_read(&eb_head(eb)->refs) == 0);
+ WARN_ON(!test_bit(EXTENT_BUFFER_TREE_REF, &eb_head(eb)->bflags));
for (i = 0; i < num_pages; i++)
set_page_dirty(extent_buffer_page(eb, i));
@@ -4828,7 +4932,9 @@ int clear_extent_buffer_uptodate(struct extent_buffer *eb)
struct page *page;
unsigned long num_pages;
- clear_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags);
+ if (!eb || !eb_head(eb))
+ return 0;
+ clear_bit(EXTENT_BUFFER_UPTODATE, &eb->ebflags);
num_pages = num_extent_pages(eb->start, eb->len);
for (i = 0; i < num_pages; i++) {
page = extent_buffer_page(eb, i);
@@ -4840,22 +4946,43 @@ int clear_extent_buffer_uptodate(struct extent_buffer *eb)
int set_extent_buffer_uptodate(struct extent_buffer *eb)
{
+ struct extent_buffer_head *ebh;
unsigned long i;
struct page *page;
unsigned long num_pages;
+ int uptodate;
- set_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags);
- num_pages = num_extent_pages(eb->start, eb->len);
- for (i = 0; i < num_pages; i++) {
- page = extent_buffer_page(eb, i);
- SetPageUptodate(page);
+ ebh = eb->ebh;
+
+ set_bit(EXTENT_BUFFER_UPTODATE, &eb->ebflags);
+ if (eb->len < PAGE_CACHE_SIZE) {
+ eb = &(eb_head(eb)->eb);
+ uptodate = 1;
+ do {
+ if (!test_bit(EXTENT_BUFFER_UPTODATE, &eb->ebflags)) {
+ uptodate = 0;
+ break;
+ }
+ } while ((eb = eb->eb_next) != NULL);
+
+ if (uptodate) {
+ page = extent_buffer_page(&ebh->eb, 0);
+ SetPageUptodate(page);
+ }
+ } else {
+ num_pages = num_extent_pages(eb->start, eb->len);
+ for (i = 0; i < num_pages; i++) {
+ page = extent_buffer_page(eb, i);
+ SetPageUptodate(page);
+ }
}
+
return 0;
}
int extent_buffer_uptodate(struct extent_buffer *eb)
{
- return test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags);
+ return test_bit(EXTENT_BUFFER_UPTODATE, &eb->ebflags);
}
int read_extent_buffer_pages(struct extent_io_tree *tree,
@@ -5075,9 +5202,10 @@ void write_extent_buffer(struct extent_buffer *eb, const void *srcv,
offset = (start_offset + start) & (PAGE_CACHE_SIZE - 1);
+ WARN_ON(!test_bit(EXTENT_BUFFER_UPTODATE, &eb->ebflags));
+
while (len > 0) {
page = extent_buffer_page(eb, i);
- WARN_ON(!PageUptodate(page));
cur = min(len, PAGE_CACHE_SIZE - offset);
kaddr = page_address(page);
@@ -5102,12 +5230,12 @@ void memset_extent_buffer(struct extent_buffer *eb, char c,
WARN_ON(start > eb->len);
WARN_ON(start + len > eb->start + eb->len);
+ WARN_ON(!test_bit(EXTENT_BUFFER_UPTODATE, &eb->ebflags));
offset = (start_offset + start) & (PAGE_CACHE_SIZE - 1);
while (len > 0) {
page = extent_buffer_page(eb, i);
- WARN_ON(!PageUptodate(page));
cur = min(len, PAGE_CACHE_SIZE - offset);
kaddr = page_address(page);
@@ -5136,9 +5264,10 @@ void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
offset = (start_offset + dst_offset) &
(PAGE_CACHE_SIZE - 1);
+ WARN_ON(!test_bit(EXTENT_BUFFER_UPTODATE, &dst->ebflags));
+
while (len > 0) {
page = extent_buffer_page(dst, i);
- WARN_ON(!PageUptodate(page));
cur = min(len, (unsigned long)(PAGE_CACHE_SIZE - offset));
@@ -5275,6 +5404,7 @@ void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
int try_release_extent_buffer(struct page *page)
{
+ struct extent_buffer_head *ebh;
struct extent_buffer *eb;
/*
@@ -5290,14 +5420,15 @@ int try_release_extent_buffer(struct page *page)
eb = (struct extent_buffer *)page->private;
BUG_ON(!eb);
+ ebh = eb->ebh;
/*
* This is a little awful but should be ok, we need to make sure that
* the eb doesn't disappear out from under us while we're looking at
* this page.
*/
- spin_lock(&eb->refs_lock);
- if (atomic_read(&eb->refs) != 1 || extent_buffer_under_io(eb)) {
- spin_unlock(&eb->refs_lock);
+ spin_lock(&ebh->refs_lock);
+ if (atomic_read(&ebh->refs) != 1 || extent_buffer_under_io(eb)) {
+ spin_unlock(&ebh->refs_lock);
spin_unlock(&page->mapping->private_lock);
return 0;
}
@@ -5307,10 +5438,11 @@ int try_release_extent_buffer(struct page *page)
* If tree ref isn't set then we know the ref on this eb is a real ref,
* so just return, this page will likely be freed soon anyway.
*/
- if (!test_and_clear_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) {
- spin_unlock(&eb->refs_lock);
+ if (!test_and_clear_bit(EXTENT_BUFFER_TREE_REF, &ebh->bflags)) {
+ spin_unlock(&ebh->refs_lock);
return 0;
}
- return release_extent_buffer(eb);
+ return release_extent_buffer(ebh);
}
+
diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h
index 42d0b74..75a01fd 100644
--- a/fs/btrfs/extent_io.h
+++ b/fs/btrfs/extent_io.h
@@ -123,19 +123,17 @@ struct extent_state {
#define INLINE_EXTENT_BUFFER_PAGES 16
#define MAX_INLINE_EXTENT_BUFFER_SIZE (INLINE_EXTENT_BUFFER_PAGES * PAGE_CACHE_SIZE)
+
+/* Forward declaration */
+struct extent_buffer_head;
+
struct extent_buffer {
u64 start;
unsigned long len;
- unsigned long map_start;
- unsigned long map_len;
- unsigned long bflags;
- struct btrfs_fs_info *fs_info;
- spinlock_t refs_lock;
- atomic_t refs;
- atomic_t io_pages;
+ unsigned long ebflags;
+ struct extent_buffer_head *ebh;
+ struct extent_buffer *eb_next;
int read_mirror;
- struct rcu_head rcu_head;
- pid_t lock_owner;
/* count of read lock holders on the extent buffer */
atomic_t write_locks;
@@ -146,6 +144,8 @@ struct extent_buffer {
atomic_t spinning_writers;
int lock_nested;
+ pid_t lock_owner;
+
/* protects write locks */
rwlock_t lock;
@@ -159,7 +159,19 @@ struct extent_buffer {
*/
wait_queue_head_t read_lock_wq;
wait_queue_head_t lock_wq;
+};
+
+struct extent_buffer_head {
+ unsigned long bflags;
+ struct btrfs_fs_info *fs_info;
+ spinlock_t refs_lock;
+ atomic_t refs;
+ atomic_t io_bvecs;
+ struct rcu_head rcu_head;
+
struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
+
+ struct extent_buffer eb;
#ifdef CONFIG_BTRFS_DEBUG
struct list_head leak_list;
#endif
@@ -176,6 +188,14 @@ static inline int extent_compress_type(unsigned long bio_flags)
return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
}
+/*
+ * return the extent_buffer_head that contains the extent buffer provided.
+ */
+static inline struct extent_buffer_head *eb_head(struct extent_buffer *eb)
+{
+ return eb->ebh;
+
+}
struct extent_map_tree;
typedef struct extent_map *(get_extent_t)(struct inode *inode,
@@ -287,15 +307,15 @@ static inline unsigned long num_extent_pages(u64 start, u64 len)
(start >> PAGE_CACHE_SHIFT);
}
-static inline struct page *extent_buffer_page(struct extent_buffer *eb,
- unsigned long i)
+static inline struct page *extent_buffer_page(
+ struct extent_buffer *eb, unsigned long i)
{
- return eb->pages[i];
+ return eb_head(eb)->pages[i];
}
static inline void extent_buffer_get(struct extent_buffer *eb)
{
- atomic_inc(&eb->refs);
+ atomic_inc(&eb_head(eb)->refs);
}
int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 07629e9..1ec359b 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -5936,7 +5936,7 @@ int btrfs_read_sys_array(struct btrfs_root *root)
* to silence the warning eg. on PowerPC 64.
*/
if (PAGE_CACHE_SIZE > BTRFS_SUPER_INFO_SIZE)
- SetPageUptodate(sb->pages[0]);
+ SetPageUptodate(eb_head(sb)->pages[0]);
write_extent_buffer(sb, super_copy, 0, BTRFS_SUPER_INFO_SIZE);
array_size = btrfs_super_sys_array_size(super_copy);
diff --git a/include/trace/events/btrfs.h b/include/trace/events/btrfs.h
index 3176cdc..5b79ac2 100644
--- a/include/trace/events/btrfs.h
+++ b/include/trace/events/btrfs.h
@@ -695,7 +695,7 @@ TRACE_EVENT(btrfs_cow_block,
TP_fast_assign(
__entry->root_objectid = root->root_key.objectid;
__entry->buf_start = buf->start;
- __entry->refs = atomic_read(&buf->refs);
+ __entry->refs = atomic_read(&eb_head(buf)->refs);
__entry->cow_start = cow->start;
__entry->buf_level = btrfs_header_level(buf);
__entry->cow_level = btrfs_header_level(cow);
--
1.8.3.1
^ permalink raw reply related [flat|nested] 9+ messages in thread
* [RFC PATCH V2 5/8] Btrfs: subpagesize-blocksize: Read tree blocks whose size is <PAGE_CACHE_SIZE.
2014-06-11 11:32 [RFC PATCH V2 0/8] Btrfs: Subpagesize-blocksize: Get rid of whole page I/O Chandan Rajendra
` (3 preceding siblings ...)
2014-06-11 11:32 ` [RFC PATCH V2 4/8] Btrfs: subpagesize-blocksize: Define extent_buffer_head Chandan Rajendra
@ 2014-06-11 11:32 ` Chandan Rajendra
2014-06-11 11:32 ` [RFC PATCH V2 6/8] Btrfs: subpagesize-blocksize: Write only dirty extent buffers belonging to a page Chandan Rajendra
` (2 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: Chandan Rajendra @ 2014-06-11 11:32 UTC (permalink / raw)
To: clm, jbacik, bo.li.liu, dsterba
Cc: Chandan Rajendra, linux-btrfs, aneesh.kumar
In the case of subpagesize-blocksize, this patch makes it possible to read
only a single metadata block from the disk instead of all the metadata blocks
that map into a page.
Signed-off-by: Chandan Rajendra <chandan@linux.vnet.ibm.com>
---
fs/btrfs/disk-io.c | 45 ++++++++---------
fs/btrfs/disk-io.h | 3 ++
fs/btrfs/extent_io.c | 135 +++++++++++++++++++++++++++++++++++++++++++--------
3 files changed, 137 insertions(+), 46 deletions(-)
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index bda2157..b2c4e9d 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -413,7 +413,7 @@ static int btree_read_extent_buffer_pages(struct btrfs_root *root,
int mirror_num = 0;
int failed_mirror = 0;
- clear_bit(EXTENT_BUFFER_CORRUPT, &eb->bflags);
+ clear_bit(EXTENT_BUFFER_CORRUPT, &eb->ebflags);
io_tree = &BTRFS_I(root->fs_info->btree_inode)->io_tree;
while (1) {
ret = read_extent_buffer_pages(io_tree, eb, start,
@@ -432,7 +432,7 @@ static int btree_read_extent_buffer_pages(struct btrfs_root *root,
* there is no reason to read the other copies, they won't be
* any less wrong.
*/
- if (test_bit(EXTENT_BUFFER_CORRUPT, &eb->bflags))
+ if (test_bit(EXTENT_BUFFER_CORRUPT, &eb->ebflags))
break;
num_copies = btrfs_num_copies(root->fs_info,
@@ -564,12 +564,13 @@ static noinline int check_leaf(struct btrfs_root *root,
return 0;
}
-static int btree_readpage_end_io_hook(struct btrfs_io_bio *io_bio,
- u64 phy_offset, struct page *page,
- u64 start, u64 end, int mirror)
+int verify_extent_buffer_read(struct btrfs_io_bio *io_bio,
+ struct page *page,
+ u64 start, u64 end, int mirror)
{
u64 found_start;
int found_level;
+ struct extent_buffer_head *ebh;
struct extent_buffer *eb;
struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
int ret = 0;
@@ -579,18 +580,26 @@ static int btree_readpage_end_io_hook(struct btrfs_io_bio *io_bio,
goto out;
eb = (struct extent_buffer *)page->private;
+ do {
+ if ((eb->start <= start) && (eb->start + eb->len - 1 > start))
+ break;
+ } while ((eb = eb->eb_next) != NULL);
+
+ BUG_ON(!eb);
+
+ ebh = eb_head(eb);
/* the pending IO might have been the only thing that kept this buffer
* in memory. Make sure we have a ref for all this other checks
*/
extent_buffer_get(eb);
- reads_done = atomic_dec_and_test(&eb->io_pages);
+ reads_done = atomic_dec_and_test(&ebh->io_bvecs);
if (!reads_done)
goto err;
eb->read_mirror = mirror;
- if (test_bit(EXTENT_BUFFER_IOERR, &eb->bflags)) {
+ if (test_bit(EXTENT_BUFFER_IOERR, &eb->ebflags)) {
ret = -EIO;
goto err;
}
@@ -632,7 +641,7 @@ static int btree_readpage_end_io_hook(struct btrfs_io_bio *io_bio,
* return -EIO.
*/
if (found_level == 0 && check_leaf(root, eb)) {
- set_bit(EXTENT_BUFFER_CORRUPT, &eb->bflags);
+ set_bit(EXTENT_BUFFER_CORRUPT, &eb->ebflags);
ret = -EIO;
}
@@ -640,7 +649,7 @@ static int btree_readpage_end_io_hook(struct btrfs_io_bio *io_bio,
set_extent_buffer_uptodate(eb);
err:
if (reads_done &&
- test_and_clear_bit(EXTENT_BUFFER_READAHEAD, &eb->bflags))
+ test_and_clear_bit(EXTENT_BUFFER_READAHEAD, &eb->ebflags))
btree_readahead_hook(root, eb, eb->start, ret);
if (ret) {
@@ -649,7 +658,7 @@ err:
* again, we have to make sure it has something
* to decrement
*/
- atomic_inc(&eb->io_pages);
+ atomic_inc(&eb_head(eb)->io_bvecs);
clear_extent_buffer_uptodate(eb);
}
free_extent_buffer(eb);
@@ -657,20 +666,6 @@ out:
return ret;
}
-static int btree_io_failed_hook(struct page *page, int failed_mirror)
-{
- struct extent_buffer *eb;
- struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
-
- eb = (struct extent_buffer *)page->private;
- set_bit(EXTENT_BUFFER_IOERR, &eb->bflags);
- eb->read_mirror = failed_mirror;
- atomic_dec(&eb->io_pages);
- if (test_and_clear_bit(EXTENT_BUFFER_READAHEAD, &eb->bflags))
- btree_readahead_hook(root, eb, eb->start, -EIO);
- return -EIO; /* we fixed nothing */
-}
-
static void end_workqueue_bio(struct bio *bio, int err)
{
struct end_io_wq *end_io_wq = bio->bi_private;
@@ -4109,8 +4104,6 @@ static int btrfs_cleanup_transaction(struct btrfs_root *root)
}
static struct extent_io_ops btree_extent_io_ops = {
- .readpage_end_io_hook = btree_readpage_end_io_hook,
- .readpage_io_failed_hook = btree_io_failed_hook,
.submit_bio_hook = btree_submit_bio_hook,
/* note we're sharing with inode.c for the merge bio hook */
.merge_bio_hook = btrfs_merge_bio_hook,
diff --git a/fs/btrfs/disk-io.h b/fs/btrfs/disk-io.h
index 53059df..678a09b 100644
--- a/fs/btrfs/disk-io.h
+++ b/fs/btrfs/disk-io.h
@@ -110,6 +110,9 @@ static inline void btrfs_put_fs_root(struct btrfs_root *root)
kfree(root);
}
+int verify_extent_buffer_read(struct btrfs_io_bio *io_bio,
+ struct page *page,
+ u64 start, u64 end, int mirror);
void btrfs_mark_buffer_dirty(struct extent_buffer *buf);
int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid,
int atomic);
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index fdc06a6..c095575 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -14,6 +14,7 @@
#include "extent_io.h"
#include "extent_map.h"
#include "ctree.h"
+#include "disk-io.h"
#include "btrfs_inode.h"
#include "volumes.h"
#include "check-integrity.h"
@@ -2120,7 +2121,7 @@ int repair_eb_io_failure(struct btrfs_root *root, struct extent_buffer *eb,
for (i = 0; i < num_pages; i++) {
struct page *p = extent_buffer_page(eb, i);
- ret = repair_io_failure(root->fs_info, start, PAGE_CACHE_SIZE,
+ ret = repair_io_failure(root->fs_info, start, eb->len,
start, p, mirror_num);
if (ret)
break;
@@ -3476,17 +3477,88 @@ static int lock_extent_buffer_for_io(struct extent_buffer *eb,
num_pages = num_extent_pages(eb->start, eb->len);
for (i = 0; i < num_pages; i++) {
struct page *p = extent_buffer_page(eb, i);
+static void end_bio_extent_buffer_readpage(struct bio *bio, int err)
+{
+ struct address_space *mapping = bio->bi_io_vec->bv_page->mapping;
+ struct extent_io_tree *tree = &BTRFS_I(mapping->host)->io_tree;
+ struct btrfs_io_bio *io_bio = btrfs_io_bio(bio);
+ struct bio_vec *bvec_end = bio->bi_io_vec + bio->bi_vcnt - 1;
+ struct bio_vec *bvec = bio->bi_io_vec;
+ struct extent_buffer *eb;
+ struct page *page = bvec->bv_page;
+ struct btrfs_root *root;
+ int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
+ u64 start;
+ u64 end;
+ int mirror;
+ int ret;
- if (!trylock_page(p)) {
- if (!flush) {
- flush_write_bio(epd);
- flush = 1;
- }
- lock_page(p);
+ root = BTRFS_I(page->mapping->host)->root;
+
+ if (err)
+ uptodate = 0;
+
+ do {
+ page = bvec->bv_page;
+
+ if (!page->private) {
+ SetPageUptodate(page);
+ goto unlock;
}
- }
- return ret;
+ eb = (struct extent_buffer *)page->private;
+
+ start = io_bio->start_offset;
+ end = start + io_bio->len - 1;
+
+ do {
+ /*
+ read_extent_buffer_pages() does not start
+ I/O on PG_uptodate pages. Hence the bio may
+ map only part of the extent buffer.
+ */
+ if ((eb->start <= start) && (eb->start + eb->len - 1 > start))
+ break;
+ } while ((eb = eb->eb_next) != NULL);
+
+ BUG_ON(!eb);
+
+ mirror = io_bio->mirror_num;
+
+ if (uptodate) {
+ ret = verify_extent_buffer_read(io_bio, page, start,
+ end, mirror);
+ if (ret)
+ uptodate = 0;
+ }
+
+ if (!uptodate) {
+ set_bit(EXTENT_BUFFER_IOERR, &eb->ebflags);
+ eb->read_mirror = mirror;
+ atomic_dec(&eb_head(eb)->io_bvecs);
+ if (test_and_clear_bit(EXTENT_BUFFER_READAHEAD,
+ &eb->ebflags))
+ btree_readahead_hook(root, eb, eb->start,
+ -EIO);
+ ClearPageUptodate(page);
+ SetPageError(page);
+ goto unlock;
+ }
+
+unlock:
+ unlock_page(page);
+ ++bvec;
+ } while (bvec <= bvec_end);
+
+ /*
+ We don't need to add a check to see if
+ extent_io_tree->track_uptodate is set or not, Since
+ this function only deals with extent buffers.
+ */
+ unlock_extent(tree, io_bio->start_offset,
+ io_bio->start_offset + io_bio->len - 1);
+
+ bio_put(bio);
}
static void end_extent_buffer_writeback(struct extent_buffer *eb)
@@ -4989,6 +5061,9 @@ int read_extent_buffer_pages(struct extent_io_tree *tree,
struct extent_buffer *eb, u64 start, int wait,
get_extent_t *get_extent, int mirror_num)
{
+ struct inode *inode = tree->mapping->host;
+ struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info;
+ struct extent_state *cached_state = NULL;
unsigned long i;
unsigned long start_i;
struct page *page;
@@ -5001,7 +5076,7 @@ int read_extent_buffer_pages(struct extent_io_tree *tree,
struct bio *bio = NULL;
unsigned long bio_flags = 0;
- if (test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags))
+ if (test_bit(EXTENT_BUFFER_UPTODATE, &eb->ebflags))
return 0;
if (start) {
@@ -5029,21 +5104,34 @@ int read_extent_buffer_pages(struct extent_io_tree *tree,
}
if (all_uptodate) {
if (start_i == 0)
- set_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags);
+ set_bit(EXTENT_BUFFER_UPTODATE, &eb->ebflags);
goto unlock_exit;
}
- clear_bit(EXTENT_BUFFER_IOERR, &eb->bflags);
+ clear_bit(EXTENT_BUFFER_IOERR, &eb->ebflags);
eb->read_mirror = 0;
- atomic_set(&eb->io_pages, num_reads);
+ atomic_set(&eb_head(eb)->io_bvecs, num_reads);
+ lock_extent_bits(tree, eb->start, eb->start + eb->len - 1, 0,
+ &cached_state);
for (i = start_i; i < num_pages; i++) {
page = extent_buffer_page(eb, i);
if (!PageUptodate(page)) {
ClearPageError(page);
- err = __extent_read_full_page(tree, page,
- get_extent, &bio,
- mirror_num, &bio_flags,
- READ | REQ_META);
+ if (eb->len < PAGE_CACHE_SIZE) {
+ err = submit_extent_page(READ | REQ_META, tree,
+ page, eb->start >> 9,
+ eb->len, eb->start - page_offset(page),
+ fs_info->fs_devices->latest_bdev,
+ &bio, -1, end_bio_extent_buffer_readpage,
+ mirror_num, bio_flags, bio_flags);
+ } else {
+ err = submit_extent_page(READ | REQ_META, tree,
+ page, page_offset(page) >> 9,
+ PAGE_CACHE_SIZE, 0,
+ fs_info->fs_devices->latest_bdev,
+ &bio, -1, end_bio_extent_buffer_readpage,
+ mirror_num, bio_flags, bio_flags);
+ }
if (err)
ret = err;
} else {
@@ -5061,11 +5149,18 @@ int read_extent_buffer_pages(struct extent_io_tree *tree,
if (ret || wait != WAIT_COMPLETE)
return ret;
- for (i = start_i; i < num_pages; i++) {
- page = extent_buffer_page(eb, i);
+ if (eb->len < PAGE_CACHE_SIZE) {
+ page = extent_buffer_page(eb, 0);
wait_on_page_locked(page);
- if (!PageUptodate(page))
+ if (!extent_buffer_uptodate(eb))
ret = -EIO;
+ } else {
+ for (i = start_i; i < num_pages; i++) {
+ page = extent_buffer_page(eb, i);
+ wait_on_page_locked(page);
+ if (!PageUptodate(page))
+ ret = -EIO;
+ }
}
return ret;
--
1.8.3.1
^ permalink raw reply related [flat|nested] 9+ messages in thread
* [RFC PATCH V2 6/8] Btrfs: subpagesize-blocksize: Write only dirty extent buffers belonging to a page
2014-06-11 11:32 [RFC PATCH V2 0/8] Btrfs: Subpagesize-blocksize: Get rid of whole page I/O Chandan Rajendra
` (4 preceding siblings ...)
2014-06-11 11:32 ` [RFC PATCH V2 5/8] Btrfs: subpagesize-blocksize: Read tree blocks whose size is <PAGE_CACHE_SIZE Chandan Rajendra
@ 2014-06-11 11:32 ` Chandan Rajendra
2014-06-11 11:32 ` [RFC PATCH V2 7/8] Btrfs: subpagesize-blocksize: Allow mounting filesystems where sectorsize != PAGE_SIZE Chandan Rajendra
2014-06-11 11:32 ` [RFC PATCH V2 8/8] Btrfs: subpagesize-blocksize: Compute and look up csums based on sectorsized blocks Chandan Rajendra
7 siblings, 0 replies; 9+ messages in thread
From: Chandan Rajendra @ 2014-06-11 11:32 UTC (permalink / raw)
To: clm, jbacik, bo.li.liu, dsterba
Cc: Chandan Rajendra, linux-btrfs, aneesh.kumar
For the subpagesize-blocksize scenario, This patch adds the ability to write a
single extent buffer to the disk.
Signed-off-by: Chandan Rajendra <chandan@linux.vnet.ibm.com>
---
fs/btrfs/disk-io.c | 20 ++--
fs/btrfs/extent_io.c | 277 ++++++++++++++++++++++++++++++++++++++++++---------
2 files changed, 243 insertions(+), 54 deletions(-)
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index b2c4e9d..28a45f6 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -466,17 +466,23 @@ static int btree_read_extent_buffer_pages(struct btrfs_root *root,
static int csum_dirty_buffer(struct btrfs_root *root, struct page *page)
{
- u64 start = page_offset(page);
- u64 found_start;
struct extent_buffer *eb;
+ u64 found_start;
eb = (struct extent_buffer *)page->private;
- if (page != eb->pages[0])
+ if (page != eb_head(eb)->pages[0])
return 0;
- found_start = btrfs_header_bytenr(eb);
- if (WARN_ON(found_start != start || !PageUptodate(page)))
- return 0;
- csum_tree_block(root, eb, 0);
+ do {
+ if (!test_bit(EXTENT_BUFFER_WRITEBACK, &eb->ebflags))
+ continue;
+ if (WARN_ON(!test_bit(EXTENT_BUFFER_UPTODATE, &eb->ebflags)))
+ continue;
+ found_start = btrfs_header_bytenr(eb);
+ if (WARN_ON(found_start != eb->start))
+ return 0;
+ csum_tree_block(root, eb, 0);
+ } while ((eb = eb->eb_next) != NULL);
+
return 0;
}
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index c095575..507ef5b 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -3420,32 +3420,53 @@ void wait_on_extent_buffer_writeback(struct extent_buffer *eb)
TASK_UNINTERRUPTIBLE);
}
-static int lock_extent_buffer_for_io(struct extent_buffer *eb,
- struct btrfs_fs_info *fs_info,
- struct extent_page_data *epd)
+static void lock_extent_buffer_pages(struct extent_buffer_head *ebh,
+ struct extent_page_data *epd)
{
+ struct extent_buffer *eb = &ebh->eb;
unsigned long i, num_pages;
- int flush = 0;
+
+ num_pages = num_extent_pages(eb->start, eb->len);
+ for (i = 0; i < num_pages; i++) {
+ struct page *p = extent_buffer_page(eb, i);
+
+ if (!trylock_page(p)) {
+ flush_write_bio(epd);
+ lock_page(p);
+ }
+ }
+
+ return;
+}
+
+static int lock_extent_buffer_for_io(struct extent_buffer *eb,
+ struct btrfs_fs_info *fs_info,
+ struct extent_page_data *epd)
+{
+ int dirty;
int ret = 0;
if (!btrfs_try_tree_write_lock(eb)) {
- flush = 1;
flush_write_bio(epd);
btrfs_tree_lock(eb);
}
- if (test_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags)) {
+ if (test_bit(EXTENT_BUFFER_WRITEBACK, &eb->ebflags)) {
+ dirty = test_bit(EXTENT_BUFFER_DIRTY, &eb->ebflags);
btrfs_tree_unlock(eb);
- if (!epd->sync_io)
- return 0;
- if (!flush) {
- flush_write_bio(epd);
- flush = 1;
+ if (!epd->sync_io) {
+ if (!dirty)
+ return 1;
+ else
+ return 2;
}
+
+ flush_write_bio(epd);
+
while (1) {
wait_on_extent_buffer_writeback(eb);
btrfs_tree_lock(eb);
- if (!test_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags))
+ if (!test_bit(EXTENT_BUFFER_WRITEBACK, &eb->ebflags))
break;
btrfs_tree_unlock(eb);
}
@@ -3456,27 +3477,25 @@ static int lock_extent_buffer_for_io(struct extent_buffer *eb,
* under IO since we can end up having no IO bits set for a short period
* of time.
*/
- spin_lock(&eb->refs_lock);
- if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)) {
- set_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags);
- spin_unlock(&eb->refs_lock);
+ spin_lock(&eb_head(eb)->refs_lock);
+ if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &eb->ebflags)) {
+ set_bit(EXTENT_BUFFER_WRITEBACK, &eb->ebflags);
+ spin_unlock(&eb_head(eb)->refs_lock);
btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN);
__percpu_counter_add(&fs_info->dirty_metadata_bytes,
-eb->len,
fs_info->dirty_metadata_batch);
- ret = 1;
+ ret = 0;
} else {
- spin_unlock(&eb->refs_lock);
+ spin_unlock(&eb_head(eb)->refs_lock);
+ ret = 1;
}
btrfs_tree_unlock(eb);
- if (!ret)
- return ret;
+ return ret;
+}
- num_pages = num_extent_pages(eb->start, eb->len);
- for (i = 0; i < num_pages; i++) {
- struct page *p = extent_buffer_page(eb, i);
static void end_bio_extent_buffer_readpage(struct bio *bio, int err)
{
struct address_space *mapping = bio->bi_io_vec->bv_page->mapping;
@@ -3563,13 +3582,14 @@ unlock:
static void end_extent_buffer_writeback(struct extent_buffer *eb)
{
- clear_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags);
+ clear_bit(EXTENT_BUFFER_WRITEBACK, &eb->ebflags);
smp_mb__after_clear_bit();
- wake_up_bit(&eb->bflags, EXTENT_BUFFER_WRITEBACK);
+ wake_up_bit(&eb->ebflags, EXTENT_BUFFER_WRITEBACK);
}
-static void end_bio_extent_buffer_writepage(struct bio *bio, int err)
+static void end_bio_subpagesize_blocksize_ebh_writepage(struct bio *bio, int err)
{
+ struct btrfs_io_bio *io_bio = btrfs_io_bio(bio);
int uptodate = err == 0;
struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1;
struct extent_buffer *eb;
@@ -3577,14 +3597,52 @@ static void end_bio_extent_buffer_writepage(struct bio *bio, int err)
do {
struct page *page = bvec->bv_page;
+ eb = (struct extent_buffer *)page->private;
+ BUG_ON(!eb);
+
+ do {
+ if (!(eb->start >= io_bio->start_offset
+ && (eb->start + eb->len)
+ <= (io_bio->start_offset + io_bio->len))) {
+ continue;
+ }
+
+ done = atomic_dec_and_test(&eb_head(eb)->io_bvecs);
+
+ if (!uptodate || test_bit(EXTENT_BUFFER_IOERR, &eb->ebflags)) {
+ set_bit(EXTENT_BUFFER_IOERR, &eb->ebflags);
+ ClearPageUptodate(page);
+ SetPageError(page);
+ }
+
+ end_extent_buffer_writeback(eb);
+
+ if (done)
+ end_page_writeback(page);
+
+ } while ((eb = eb->eb_next) != NULL);
+
+ } while (--bvec >= bio->bi_io_vec);
+
+}
+
+static void end_bio_regular_ebh_writepage(struct bio *bio, int err)
+{
+ int uptodate = (err == 0);
+ struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1;
+ struct extent_buffer *eb;
+ int done;
+
+ do {
+ struct page *page = bvec->bv_page;
bvec--;
eb = (struct extent_buffer *)page->private;
BUG_ON(!eb);
- done = atomic_dec_and_test(&eb->io_pages);
+ done = atomic_dec_and_test(&eb_head(eb)->io_bvecs);
- if (!uptodate || test_bit(EXTENT_BUFFER_IOERR, &eb->bflags)) {
- set_bit(EXTENT_BUFFER_IOERR, &eb->bflags);
+ if (!uptodate || test_bit(EXTENT_BUFFER_IOERR, &eb->ebflags)) {
+ set_bit(EXTENT_BUFFER_IOERR, &eb->ebflags);
ClearPageUptodate(page);
SetPageError(page);
}
@@ -3601,22 +3659,23 @@ static void end_bio_extent_buffer_writepage(struct bio *bio, int err)
}
-static int write_one_eb(struct extent_buffer *eb,
+static int write_regular_ebh(struct extent_buffer_head *ebh,
struct btrfs_fs_info *fs_info,
struct writeback_control *wbc,
struct extent_page_data *epd)
{
struct block_device *bdev = fs_info->fs_devices->latest_bdev;
struct extent_io_tree *tree = &BTRFS_I(fs_info->btree_inode)->io_tree;
- u64 offset = eb->start;
+ struct extent_buffer *eb = &ebh->eb;
+ u64 offset = eb->start & ~(PAGE_CACHE_SIZE - 1);
unsigned long i, num_pages;
unsigned long bio_flags = 0;
int rw = (epd->sync_io ? WRITE_SYNC : WRITE) | REQ_META;
int ret = 0;
- clear_bit(EXTENT_BUFFER_IOERR, &eb->bflags);
+ clear_bit(EXTENT_BUFFER_IOERR, &eb->ebflags);
num_pages = num_extent_pages(eb->start, eb->len);
- atomic_set(&eb->io_pages, num_pages);
+ atomic_set(&eb_head(eb)->io_bvecs, num_pages);
if (btrfs_header_owner(eb) == BTRFS_TREE_LOG_OBJECTID)
bio_flags = EXTENT_BIO_TREE_LOG;
@@ -3627,13 +3686,14 @@ static int write_one_eb(struct extent_buffer *eb,
set_page_writeback(p);
ret = submit_extent_page(rw, tree, p, offset >> 9,
PAGE_CACHE_SIZE, 0, bdev, &epd->bio,
- -1, end_bio_extent_buffer_writepage,
+ -1, end_bio_regular_ebh_writepage,
0, epd->bio_flags, bio_flags);
epd->bio_flags = bio_flags;
if (ret) {
- set_bit(EXTENT_BUFFER_IOERR, &eb->bflags);
+ set_bit(EXTENT_BUFFER_IOERR, &eb->ebflags);
SetPageError(p);
- if (atomic_sub_and_test(num_pages - i, &eb->io_pages))
+ if (atomic_sub_and_test(num_pages - i,
+ &eb_head(eb)->io_bvecs))
end_extent_buffer_writeback(eb);
ret = -EIO;
break;
@@ -3653,12 +3713,85 @@ static int write_one_eb(struct extent_buffer *eb,
return ret;
}
+static int write_subpagesize_blocksize_ebh(struct extent_buffer_head *ebh,
+ struct btrfs_fs_info *fs_info,
+ struct writeback_control *wbc,
+ struct extent_page_data *epd,
+ unsigned long ebs_to_write)
+{
+ struct block_device *bdev = fs_info->fs_devices->latest_bdev;
+ struct extent_io_tree *tree = &BTRFS_I(fs_info->btree_inode)->io_tree;
+ struct extent_buffer *eb;
+ struct page *p;
+ u64 offset;
+ unsigned long i;
+ unsigned long bio_flags = 0;
+ int rw = (epd->sync_io ? WRITE_SYNC : WRITE) | REQ_META;
+ int ret = 0, err = 0;
+
+ eb = &ebh->eb;
+ p = extent_buffer_page(eb, 0);
+ clear_page_dirty_for_io(p);
+ set_page_writeback(p);
+ i = 0;
+ do {
+ if (!test_bit(i++, &ebs_to_write))
+ continue;
+
+ clear_bit(EXTENT_BUFFER_IOERR, &eb->ebflags);
+ atomic_inc(&eb_head(eb)->io_bvecs);
+
+ if (btrfs_header_owner(eb) == BTRFS_TREE_LOG_OBJECTID)
+ bio_flags = EXTENT_BIO_TREE_LOG;
+
+ offset = eb->start - page_offset(p);
+
+ ret = submit_extent_page(rw, tree, p, eb->start >> 9,
+ eb->len, offset,
+ bdev, &epd->bio, -1,
+ end_bio_subpagesize_blocksize_ebh_writepage,
+ 0, epd->bio_flags, bio_flags);
+ epd->bio_flags = bio_flags;
+ if (ret) {
+ set_bit(EXTENT_BUFFER_IOERR, &eb->ebflags);
+ SetPageError(p);
+ atomic_dec(&eb_head(eb)->io_bvecs);
+ end_extent_buffer_writeback(eb);
+ err = -EIO;
+ }
+ } while ((eb = eb->eb_next) != NULL);
+
+ if (!err) {
+ update_nr_written(p, wbc, 1);
+ }
+
+ unlock_page(p);
+
+ return ret;
+}
+
+static void redirty_extent_buffer_pages_for_writepage(struct extent_buffer *eb,
+ struct writeback_control *wbc)
+{
+ unsigned long i, num_pages;
+ struct page *p;
+
+ num_pages = num_extent_pages(eb->start, eb->len);
+ for (i = 0; i < num_pages; i++) {
+ p = extent_buffer_page(eb, i);
+ redirty_page_for_writepage(wbc, p);
+ }
+
+ return;
+}
+
int btree_write_cache_pages(struct address_space *mapping,
- struct writeback_control *wbc)
+ struct writeback_control *wbc)
{
struct extent_io_tree *tree = &BTRFS_I(mapping->host)->io_tree;
struct btrfs_fs_info *fs_info = BTRFS_I(mapping->host)->root->fs_info;
- struct extent_buffer *eb, *prev_eb = NULL;
+ struct extent_buffer *eb;
+ struct extent_buffer_head *ebh, *prev_ebh = NULL;
struct extent_page_data epd = {
.bio = NULL,
.tree = tree,
@@ -3669,6 +3802,7 @@ int btree_write_cache_pages(struct address_space *mapping,
int ret = 0;
int done = 0;
int nr_to_write_done = 0;
+ unsigned long ebs_to_write, dirty_ebs;
struct pagevec pvec;
int nr_pages;
pgoff_t index;
@@ -3695,7 +3829,7 @@ retry:
while (!done && !nr_to_write_done && (index <= end) &&
(nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, tag,
min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1))) {
- unsigned i;
+ unsigned i, j;
scanned = 1;
for (i = 0; i < nr_pages; i++) {
@@ -3727,30 +3861,79 @@ retry:
continue;
}
- if (eb == prev_eb) {
+ ebh = eb_head(eb);
+ if (ebh == prev_ebh) {
spin_unlock(&mapping->private_lock);
continue;
}
- ret = atomic_inc_not_zero(&eb->refs);
+ ret = atomic_inc_not_zero(&ebh->refs);
spin_unlock(&mapping->private_lock);
if (!ret)
continue;
- prev_eb = eb;
- ret = lock_extent_buffer_for_io(eb, fs_info, &epd);
- if (!ret) {
+ prev_ebh = ebh;
+
+ j = 0;
+ ebs_to_write = dirty_ebs = 0;
+ eb = &ebh->eb;
+ do {
+ BUG_ON(j >= BITS_PER_LONG);
+
+ ret = lock_extent_buffer_for_io(eb, fs_info, &epd);
+ switch (ret) {
+ case 0:
+ /*
+ EXTENT_BUFFER_DIRTY was set and we were able to
+ clear it.
+ */
+ set_bit(j, &ebs_to_write);
+ break;
+ case 2:
+ /*
+ EXTENT_BUFFER_DIRTY was set, but we were unable
+ to clear EXTENT_BUFFER_WRITEBACK that was set
+ before we got the extent buffer locked.
+ */
+ set_bit(j, &dirty_ebs);
+ default:
+ /*
+ EXTENT_BUFFER_DIRTY wasn't set.
+ */
+ break;
+ }
+ ++j;
+ } while ((eb = eb->eb_next) != NULL);
+
+ ret = 0;
+
+ if (!ebs_to_write) {
free_extent_buffer(eb);
continue;
}
- ret = write_one_eb(eb, fs_info, wbc, &epd);
+ /*
+ Now that we know that atleast one of the extent buffer
+ belonging to the extent buffer head must be written to
+ the disk, lock the extent_buffer_head's pages.
+ */
+ lock_extent_buffer_pages(ebh, &epd);
+
+ if (ebh->eb.len < PAGE_CACHE_SIZE) {
+ ret = write_subpagesize_blocksize_ebh(ebh, fs_info, wbc, &epd, ebs_to_write);
+ if (dirty_ebs) {
+ redirty_extent_buffer_pages_for_writepage(&ebh->eb, wbc);
+ }
+ } else {
+ ret = write_regular_ebh(ebh, fs_info, wbc, &epd);
+ }
+
if (ret) {
done = 1;
- free_extent_buffer(eb);
+ free_extent_buffer(&ebh->eb);
break;
}
- free_extent_buffer(eb);
+ free_extent_buffer(&ebh->eb);
/*
* the filesystem may choose to bump up nr_to_write.
--
1.8.3.1
^ permalink raw reply related [flat|nested] 9+ messages in thread
* [RFC PATCH V2 7/8] Btrfs: subpagesize-blocksize: Allow mounting filesystems where sectorsize != PAGE_SIZE
2014-06-11 11:32 [RFC PATCH V2 0/8] Btrfs: Subpagesize-blocksize: Get rid of whole page I/O Chandan Rajendra
` (5 preceding siblings ...)
2014-06-11 11:32 ` [RFC PATCH V2 6/8] Btrfs: subpagesize-blocksize: Write only dirty extent buffers belonging to a page Chandan Rajendra
@ 2014-06-11 11:32 ` Chandan Rajendra
2014-06-11 11:32 ` [RFC PATCH V2 8/8] Btrfs: subpagesize-blocksize: Compute and look up csums based on sectorsized blocks Chandan Rajendra
7 siblings, 0 replies; 9+ messages in thread
From: Chandan Rajendra @ 2014-06-11 11:32 UTC (permalink / raw)
To: clm, jbacik, bo.li.liu, dsterba
Cc: Chandra Seetharaman, linux-btrfs, aneesh.kumar, Chandan Rajendra
From: Chandra Seetharaman <sekharan@us.ibm.com>
This patch allows mounting filesystems with blocksize smaller than the
PAGE_SIZE.
Signed-off-by: Chandra Seetharaman <sekharan@us.ibm.com>
Signed-off-by: Chandan Rajendra <chandan@linux.vnet.ibm.com>
---
fs/btrfs/disk-io.c | 6 ------
1 file changed, 6 deletions(-)
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 28a45f6..3bb7072 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -2599,12 +2599,6 @@ int open_ctree(struct super_block *sb,
goto fail_sb_buffer;
}
- if (sectorsize != PAGE_SIZE) {
- printk(KERN_WARNING "BTRFS: Incompatible sector size(%lu) "
- "found on %s\n", (unsigned long)sectorsize, sb->s_id);
- goto fail_sb_buffer;
- }
-
mutex_lock(&fs_info->chunk_mutex);
ret = btrfs_read_sys_array(tree_root);
mutex_unlock(&fs_info->chunk_mutex);
--
1.8.3.1
^ permalink raw reply related [flat|nested] 9+ messages in thread
* [RFC PATCH V2 8/8] Btrfs: subpagesize-blocksize: Compute and look up csums based on sectorsized blocks.
2014-06-11 11:32 [RFC PATCH V2 0/8] Btrfs: Subpagesize-blocksize: Get rid of whole page I/O Chandan Rajendra
` (6 preceding siblings ...)
2014-06-11 11:32 ` [RFC PATCH V2 7/8] Btrfs: subpagesize-blocksize: Allow mounting filesystems where sectorsize != PAGE_SIZE Chandan Rajendra
@ 2014-06-11 11:32 ` Chandan Rajendra
7 siblings, 0 replies; 9+ messages in thread
From: Chandan Rajendra @ 2014-06-11 11:32 UTC (permalink / raw)
To: clm, jbacik, bo.li.liu, dsterba
Cc: Chandan Rajendra, linux-btrfs, aneesh.kumar
Checksums are applicable to sectorsize units. The current code uses
bio->bv_len units to compute and look up checksums. This works on machines
where sectorsize == PAGE_CACHE_SIZE. This patch makes the checksum
computation and look up code to work with sectorsize units.
Signed-off-by: Chandan Rajendra <chandan@linux.vnet.ibm.com>
---
fs/btrfs/file-item.c | 85 ++++++++++++++++++++++++++++++++--------------------
1 file changed, 52 insertions(+), 33 deletions(-)
diff --git a/fs/btrfs/file-item.c b/fs/btrfs/file-item.c
index 9d84658..16deb87 100644
--- a/fs/btrfs/file-item.c
+++ b/fs/btrfs/file-item.c
@@ -172,6 +172,7 @@ static int __btrfs_lookup_bio_sums(struct btrfs_root *root,
u64 item_start_offset = 0;
u64 item_last_offset = 0;
u64 disk_bytenr;
+ u64 page_bytes_left;
u32 diff;
int nblocks;
int bio_index = 0;
@@ -220,6 +221,8 @@ static int __btrfs_lookup_bio_sums(struct btrfs_root *root,
disk_bytenr = (u64)bio->bi_sector << 9;
if (dio)
offset = logical_offset;
+
+ page_bytes_left = bvec->bv_len;
while (bio_index < bio->bi_vcnt) {
if (!dio)
offset = page_offset(bvec->bv_page) + bvec->bv_offset;
@@ -243,7 +246,7 @@ static int __btrfs_lookup_bio_sums(struct btrfs_root *root,
if (BTRFS_I(inode)->root->root_key.objectid ==
BTRFS_DATA_RELOC_TREE_OBJECTID) {
set_extent_bits(io_tree, offset,
- offset + bvec->bv_len - 1,
+ offset + root->sectorsize - 1,
EXTENT_NODATASUM, GFP_NOFS);
} else {
btrfs_info(BTRFS_I(inode)->root->fs_info,
@@ -281,11 +284,17 @@ static int __btrfs_lookup_bio_sums(struct btrfs_root *root,
found:
csum += count * csum_size;
nblocks -= count;
+
while (count--) {
- disk_bytenr += bvec->bv_len;
- offset += bvec->bv_len;
- bio_index++;
- bvec++;
+ disk_bytenr += root->sectorsize;
+ offset += root->sectorsize;
+ page_bytes_left -= root->sectorsize;
+ if (!page_bytes_left) {
+ bio_index++;
+ bvec++;
+ page_bytes_left = bvec->bv_len;
+ }
+
}
}
btrfs_free_path(path);
@@ -442,6 +451,8 @@ int btrfs_csum_one_bio(struct btrfs_root *root, struct inode *inode,
struct bio_vec *bvec = bio->bi_io_vec;
int bio_index = 0;
int index;
+ int nr_sectors;
+ int i;
unsigned long total_bytes = 0;
unsigned long this_sum_bytes = 0;
u64 offset;
@@ -468,41 +479,49 @@ int btrfs_csum_one_bio(struct btrfs_root *root, struct inode *inode,
if (!contig)
offset = page_offset(bvec->bv_page) + bvec->bv_offset;
- if (offset >= ordered->file_offset + ordered->len ||
- offset < ordered->file_offset) {
- unsigned long bytes_left;
- sums->len = this_sum_bytes;
- this_sum_bytes = 0;
- btrfs_add_ordered_sum(inode, ordered, sums);
- btrfs_put_ordered_extent(ordered);
+ data = kmap_atomic(bvec->bv_page);
- bytes_left = bio->bi_size - total_bytes;
+ nr_sectors = (bvec->bv_len + root->sectorsize - 1)
+ >> root->fs_info->sb->s_blocksize_bits;
+
+ for (i = 0; i < nr_sectors; i++) {
+ if (offset >= ordered->file_offset + ordered->len ||
+ offset < ordered->file_offset) {
+ unsigned long bytes_left;
+ sums->len = this_sum_bytes;
+ this_sum_bytes = 0;
+ btrfs_add_ordered_sum(inode, ordered, sums);
+ btrfs_put_ordered_extent(ordered);
+
+ bytes_left = bio->bi_size - total_bytes;
+
+ sums = kzalloc(btrfs_ordered_sum_size(root, bytes_left),
+ GFP_NOFS);
+ BUG_ON(!sums); /* -ENOMEM */
+ sums->len = bytes_left;
+ ordered = btrfs_lookup_ordered_extent(inode, offset);
+ BUG_ON(!ordered); /* Logic error */
+ sums->bytenr = ((u64)bio->bi_sector << 9) +
+ total_bytes;
+ index = 0;
+ }
- sums = kzalloc(btrfs_ordered_sum_size(root, bytes_left),
- GFP_NOFS);
- BUG_ON(!sums); /* -ENOMEM */
- sums->len = bytes_left;
- ordered = btrfs_lookup_ordered_extent(inode, offset);
- BUG_ON(!ordered); /* Logic error */
- sums->bytenr = ((u64)bio->bi_sector << 9) +
- total_bytes;
- index = 0;
+ sums->sums[index] = ~(u32)0;
+ sums->sums[index]
+ = btrfs_csum_data(data + bvec->bv_offset + (i * root->sectorsize),
+ sums->sums[index],
+ root->sectorsize);
+ btrfs_csum_final(sums->sums[index],
+ (char *)(sums->sums + index));
+ index++;
+ offset += root->sectorsize;
+ this_sum_bytes += root->sectorsize;
+ total_bytes += root->sectorsize;
}
- data = kmap_atomic(bvec->bv_page);
- sums->sums[index] = ~(u32)0;
- sums->sums[index] = btrfs_csum_data(data + bvec->bv_offset,
- sums->sums[index],
- bvec->bv_len);
kunmap_atomic(data);
- btrfs_csum_final(sums->sums[index],
- (char *)(sums->sums + index));
bio_index++;
- index++;
- total_bytes += bvec->bv_len;
- this_sum_bytes += bvec->bv_len;
- offset += bvec->bv_len;
bvec++;
}
this_sum_bytes = 0;
--
1.8.3.1
^ permalink raw reply related [flat|nested] 9+ messages in thread
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2014-06-11 11:32 [RFC PATCH V2 0/8] Btrfs: Subpagesize-blocksize: Get rid of whole page I/O Chandan Rajendra
2014-06-11 11:32 ` [RFC PATCH V2 1/8] Btrfs: subpagesize-blocksize: Get rid of whole page reads Chandan Rajendra
2014-06-11 11:32 ` [RFC PATCH V2 2/8] Btrfs: subpagesize-blocksize: Get rid of whole page writes Chandan Rajendra
2014-06-11 11:32 ` [RFC PATCH V2 3/8] Btrfs: subpagesize-blocksize: __btrfs_buffered_write: Reserve/release extents aligned to block size Chandan Rajendra
2014-06-11 11:32 ` [RFC PATCH V2 4/8] Btrfs: subpagesize-blocksize: Define extent_buffer_head Chandan Rajendra
2014-06-11 11:32 ` [RFC PATCH V2 5/8] Btrfs: subpagesize-blocksize: Read tree blocks whose size is <PAGE_CACHE_SIZE Chandan Rajendra
2014-06-11 11:32 ` [RFC PATCH V2 6/8] Btrfs: subpagesize-blocksize: Write only dirty extent buffers belonging to a page Chandan Rajendra
2014-06-11 11:32 ` [RFC PATCH V2 7/8] Btrfs: subpagesize-blocksize: Allow mounting filesystems where sectorsize != PAGE_SIZE Chandan Rajendra
2014-06-11 11:32 ` [RFC PATCH V2 8/8] Btrfs: subpagesize-blocksize: Compute and look up csums based on sectorsized blocks Chandan Rajendra
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