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Violators will be prosecuted; Tue, 27 Oct 2015 19:41:11 +1000 X-Helo: d23dlp02.au.ibm.com X-MailFrom: chandan@linux.vnet.ibm.com X-RcptTo: linux-btrfs@vger.kernel.org Received: from d23relay09.au.ibm.com (d23relay09.au.ibm.com [9.185.63.181]) by d23dlp02.au.ibm.com (Postfix) with ESMTP id BC8F22BB0051 for ; Tue, 27 Oct 2015 20:41:10 +1100 (EST) Received: from d23av04.au.ibm.com (d23av04.au.ibm.com [9.190.235.139]) by d23relay09.au.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id t9R9f2Vb1310976 for ; Tue, 27 Oct 2015 20:41:10 +1100 Received: from d23av04.au.ibm.com (localhost [127.0.0.1]) by d23av04.au.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id t9R9ebHG018474 for ; Tue, 27 Oct 2015 20:40:38 +1100 Received: from localhost.in.ibm.com ([9.124.35.170]) by d23av04.au.ibm.com (8.14.4/8.14.4/NCO v10.0 AVin) with ESMTP id t9R9eWiu017951; Tue, 27 Oct 2015 20:40:35 +1100 From: Chandan Rajendra To: linux-btrfs@vger.kernel.org Cc: Chandan Rajendra , clm@fb.com, jbacik@fb.com, bo.li.liu@oracle.com, dsterba@suse.cz, quwenruo@cn.fujitsu.com, chandan@mykolab.com Subject: [PATCH V7 01/13] Btrfs: __btrfs_buffered_write: Reserve/release extents aligned to block size Date: Tue, 27 Oct 2015 15:09:34 +0530 Message-Id: <1445938786-12488-2-git-send-email-chandan@linux.vnet.ibm.com> X-Mailer: git-send-email 2.1.0 In-Reply-To: <1445938786-12488-1-git-send-email-chandan@linux.vnet.ibm.com> References: <1445938786-12488-1-git-send-email-chandan@linux.vnet.ibm.com> X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 15102709-0025-0000-0000-0000025376A5 Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Currently, the code reserves/releases extents in multiples of PAGE_CACHE_SIZE units. Fix this by doing reservation/releases in block size units. Signed-off-by: Chandan Rajendra --- fs/btrfs/ctree.h | 3 +++ fs/btrfs/file.c | 43 ++++++++++++++++++++++++++++++------------- 2 files changed, 33 insertions(+), 13 deletions(-) diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index bc3c711..c9963f6 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -2260,6 +2260,9 @@ struct btrfs_map_token { unsigned long offset; }; +#define BTRFS_BYTES_TO_BLKS(fs_info, bytes) \ + ((bytes) >> (fs_info)->sb->s_blocksize_bits) + static inline void btrfs_init_map_token (struct btrfs_map_token *token) { token->kaddr = NULL; diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c index 1243205..e31e120 100644 --- a/fs/btrfs/file.c +++ b/fs/btrfs/file.c @@ -499,7 +499,7 @@ int btrfs_dirty_pages(struct btrfs_root *root, struct inode *inode, loff_t isize = i_size_read(inode); start_pos = pos & ~((u64)root->sectorsize - 1); - num_bytes = ALIGN(write_bytes + pos - start_pos, root->sectorsize); + num_bytes = round_up(write_bytes + pos - start_pos, root->sectorsize); end_of_last_block = start_pos + num_bytes - 1; err = btrfs_set_extent_delalloc(inode, start_pos, end_of_last_block, @@ -1362,16 +1362,19 @@ 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 = round_down(pos, root->sectorsize); + last_pos = start_pos + + round_up(pos + write_bytes - start_pos, root->sectorsize) - 1; if (start_pos < inode->i_size) { struct btrfs_ordered_extent *ordered; @@ -1486,6 +1489,7 @@ 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); @@ -1494,6 +1498,8 @@ static noinline ssize_t __btrfs_buffered_write(struct file *file, size_t reserve_bytes; size_t dirty_pages; size_t copied; + size_t dirty_sectors; + size_t num_sectors; WARN_ON(num_pages > nrptrs); @@ -1506,7 +1512,9 @@ 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 = round_up(write_bytes + sector_offset, + root->sectorsize); if (BTRFS_I(inode)->flags & (BTRFS_INODE_NODATACOW | BTRFS_INODE_PREALLOC)) { @@ -1525,7 +1533,9 @@ static noinline ssize_t __btrfs_buffered_write(struct file *file, */ num_pages = DIV_ROUND_UP(write_bytes + offset, PAGE_CACHE_SIZE); - reserve_bytes = num_pages << PAGE_CACHE_SHIFT; + reserve_bytes = round_up(write_bytes + + sector_offset, + root->sectorsize); goto reserve_metadata; } } @@ -1559,8 +1569,8 @@ 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; @@ -1596,9 +1606,16 @@ 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; + num_sectors = BTRFS_BYTES_TO_BLKS(root->fs_info, + reserve_bytes); + dirty_sectors = round_up(copied + sector_offset, + root->sectorsize); + dirty_sectors = BTRFS_BYTES_TO_BLKS(root->fs_info, + dirty_sectors); + + if (num_sectors > dirty_sectors) { + release_bytes = (write_bytes - copied) + & ~((u64)root->sectorsize - 1); if (copied > 0) { spin_lock(&BTRFS_I(inode)->lock); BTRFS_I(inode)->outstanding_extents++; @@ -1612,7 +1629,8 @@ again: release_bytes); } - release_bytes = dirty_pages << PAGE_CACHE_SHIFT; + release_bytes = round_up(copied + sector_offset, + root->sectorsize); if (copied > 0) ret = btrfs_dirty_pages(root, inode, pages, @@ -1633,8 +1651,7 @@ again: if (only_release_metadata && copied > 0) { lockstart = round_down(pos, root->sectorsize); - lockend = lockstart + - (dirty_pages << PAGE_CACHE_SHIFT) - 1; + lockend = round_up(pos + copied, root->sectorsize) - 1; set_extent_bit(&BTRFS_I(inode)->io_tree, lockstart, lockend, EXTENT_NORESERVE, NULL,