From patchwork Tue Sep 24 07:40:43 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 13810415 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6924714A4DC; Tue, 24 Sep 2024 07:41:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.137.202.133 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727163685; cv=none; b=B6EfpMJX4k/rkaCcXWdp+5+DlGx3zVOQT6CvPFrG7E+Z/no0GDgWk6X/hiVbGICpplmIXR+4csKz8BGfA9KMsE5tY+ENG9qzc6BppqQPt8xErtS4gKl+99IOoRQ041PV+OBsa40KD9UeUppOuxRElSpb68BrQ/DC039Q8biOLTI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727163685; c=relaxed/simple; bh=QdTfzr7+jI79irwZVd3XFgSAH/bYrYFsD1r4F9MgmAs=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=rh8zcO4vg+BigAggia/MQ0LrG2gep7II0cBI3aV49N+V4t2EOe2sRQL2V7PADIwVaGoXTG4gJErQayJW1GwIH+NTf0dk9H2qYUrZEd1pUGdcI8pQTUHsFooLVblv4+65aQkAGB7rBFBeVG3D2exw32/8aDSKhPIDdlROqQpu0os= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de; spf=none smtp.mailfrom=bombadil.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=v/H5oFxs; arc=none smtp.client-ip=198.137.202.133 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=bombadil.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="v/H5oFxs" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From:Sender :Reply-To:Content-Type:Content-ID:Content-Description; bh=up31ahDxat1SKY5qQH6eThzNHFP9FnIFJl22bu3tHJs=; b=v/H5oFxs7cHTlsJgCLvlrVtJcB atas+IqjeBaf/twOz64qfSbWmJoplMlIVkJPevEWZoRn+zy1x3L3OOUj6zWLbmq79UGy1SU/ry7Rt WVjqmcIaLE2MA9iJ8yWHIGpU98VT2xrD1mBVRpGE5SfaCqb0febESTqLEt0J6WWDAqO4GvFRDrgsb aXV4rRv8btVAVdQhYcfA+9384MCq+NzAx5wWhbksrZJrx6Ph74JJS6YQX3f7Zd5inBi2pwbaNaXuu /NqekzIzgCT3O4sivnFf907ry89pIECPuKbbN077kSfEvJ1wXSBgMaMxP70ZTSPAuM2hcl+EB9rJD yVF40JpQ==; Received: from 2a02-8389-2341-5b80-b62d-f525-8e84-d569.cable.dynamic.v6.surfer.at ([2a02:8389:2341:5b80:b62d:f525:8e84:d569] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.98 #2 (Red Hat Linux)) id 1st0Ak-00000001SI3-2rbg; Tue, 24 Sep 2024 07:41:23 +0000 From: Christoph Hellwig To: Chandan Babu R , Carlos Maiolino , Christian Brauner , "Darrick J. Wong" Cc: linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org Subject: [PATCH 01/10] iomap: factor out a iomap_last_written_block helper Date: Tue, 24 Sep 2024 09:40:43 +0200 Message-ID: <20240924074115.1797231-2-hch@lst.de> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240924074115.1797231-1-hch@lst.de> References: <20240924074115.1797231-1-hch@lst.de> Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Split out a pice of logic from iomap_file_buffered_write_punch_delalloc that is useful for all iomap_end implementations. Signed-off-by: Christoph Hellwig Reviewed-by: Darrick J. Wong --- fs/iomap/buffered-io.c | 13 ++----------- include/linux/iomap.h | 14 ++++++++++++++ 2 files changed, 16 insertions(+), 11 deletions(-) diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c index 11ea747228aeec..884891ac7a226c 100644 --- a/fs/iomap/buffered-io.c +++ b/fs/iomap/buffered-io.c @@ -1280,7 +1280,6 @@ void iomap_file_buffered_write_punch_delalloc(struct inode *inode, { loff_t start_byte; loff_t end_byte; - unsigned int blocksize = i_blocksize(inode); if (iomap->type != IOMAP_DELALLOC) return; @@ -1289,16 +1288,8 @@ void iomap_file_buffered_write_punch_delalloc(struct inode *inode, if (!(iomap->flags & IOMAP_F_NEW)) return; - /* - * start_byte refers to the first unused block after a short write. If - * nothing was written, round offset down to point at the first block in - * the range. - */ - if (unlikely(!written)) - start_byte = round_down(pos, blocksize); - else - start_byte = round_up(pos + written, blocksize); - end_byte = round_up(pos + length, blocksize); + start_byte = iomap_last_written_block(inode, pos, written); + end_byte = round_up(pos + length, i_blocksize(inode)); /* Nothing to do if we've written the entire delalloc extent */ if (start_byte >= end_byte) diff --git a/include/linux/iomap.h b/include/linux/iomap.h index 4ad12a3c8bae22..62253739dedcbe 100644 --- a/include/linux/iomap.h +++ b/include/linux/iomap.h @@ -256,6 +256,20 @@ static inline const struct iomap *iomap_iter_srcmap(const struct iomap_iter *i) return &i->iomap; } +/* + * Return the file offset for the first unchanged block after a short write. + * + * If nothing was written, round @pos down to point at the first block in + * the range, else round up to include the partially written block. + */ +static inline loff_t iomap_last_written_block(struct inode *inode, loff_t pos, + ssize_t written) +{ + if (unlikely(!written)) + return round_down(pos, i_blocksize(inode)); + return round_up(pos + written, i_blocksize(inode)); +} + ssize_t iomap_file_buffered_write(struct kiocb *iocb, struct iov_iter *from, const struct iomap_ops *ops, void *private); int iomap_read_folio(struct folio *folio, const struct iomap_ops *ops); From patchwork Tue Sep 24 07:40:44 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 13810416 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 649EA14A4DC; Tue, 24 Sep 2024 07:41:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.137.202.133 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727163688; cv=none; b=T9r6sMMxWPiXf9iEQG5pchMjZLtvmI3fj55vawReI/XG0s3B2KSnuLiOzCFAN+pgwgCCBJi8HZKYPO3SXaXF8Ujd9kUkLrGYD+oN15c7yQnja1gavY1Kc4MBNutjGuAGqE/6YW/QqXSfczibt16mu0dfYTpHr0M1ZQpD+isNfDk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727163688; c=relaxed/simple; bh=jE3CfQ0OXJaKNenAhllpdwB2LMJGOZXM1yzi2CBqy5o=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=NAF2/2AAiEpj0Ttcx6RZYEBz3XKSQVr/dpp3Xuj6Tb2ekzZ590kj3/VBq12FDC8miWWeveuirPomoa5pEk85A0etGIElqwZt52Vy4UfwkesO5+VF5EJW9at/PmXVg6DTY3mtoUC+ISzfgK/vQj4swbzRML1exxqFQPB0l9mgtrA= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de; spf=none smtp.mailfrom=bombadil.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=MlJZjQZn; arc=none smtp.client-ip=198.137.202.133 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=bombadil.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="MlJZjQZn" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From:Sender :Reply-To:Content-Type:Content-ID:Content-Description; bh=wq4ehzJYTjloXJc0X0T1qtDSs+TKgvlpdbL+ey32Z14=; b=MlJZjQZnloxqXfHNjsb168Y6D9 Onp+uDkTHKTXWDwhLD6dcHP0Gqmtr+wnCUk3LCai2y/BWa3NzQT3ZmgwM5jetVMNxJjOxlbEWGKdB 1FAFzSCyAfbGCcZ3Gjc1uQd8CwbFbdyWZz2xS6MWzU8suiRQnM9dWbTpBXZ/SwcCBecHdNGWThGqA +3uF0L3kF7Jg67lVLvpl413P/cD6seBbf4iXBYzr7LurJJUF0b3t8WN/sifjrF69y+iPgjT65rGEL UpaQKKTyotIoejMUyObT+suaCSLyffq7r8isKtXr85rC1hxw1DlfcrJaTulxwW7wmgzjIURUlEq7Z eD27/STQ==; Received: from 2a02-8389-2341-5b80-b62d-f525-8e84-d569.cable.dynamic.v6.surfer.at ([2a02:8389:2341:5b80:b62d:f525:8e84:d569] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.98 #2 (Red Hat Linux)) id 1st0An-00000001SIx-0hmK; Tue, 24 Sep 2024 07:41:25 +0000 From: Christoph Hellwig To: Chandan Babu R , Carlos Maiolino , Christian Brauner , "Darrick J. Wong" Cc: linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org Subject: [PATCH 02/10] iomap: remove iomap_file_buffered_write_punch_delalloc Date: Tue, 24 Sep 2024 09:40:44 +0200 Message-ID: <20240924074115.1797231-3-hch@lst.de> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240924074115.1797231-1-hch@lst.de> References: <20240924074115.1797231-1-hch@lst.de> Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Currently iomap_file_buffered_write_punch_delalloc can be called from XFS either with the invalidate lock held or not. To fix this while keeping the locking in the file system and not the iomap library code we'll need to life the locking up into the file system. To prepare for that, open code iomap_file_buffered_write_punch_delalloc in the only caller, and instead export iomap_write_delalloc_release. Signed-off-by: Christoph Hellwig Reviewed-by: Darrick J. Wong --- .../filesystems/iomap/operations.rst | 2 +- fs/iomap/buffered-io.c | 85 ++++++------------- fs/xfs/xfs_iomap.c | 16 +++- include/linux/iomap.h | 6 +- 4 files changed, 46 insertions(+), 63 deletions(-) diff --git a/Documentation/filesystems/iomap/operations.rst b/Documentation/filesystems/iomap/operations.rst index 8e6c721d233010..b93115ab8748ae 100644 --- a/Documentation/filesystems/iomap/operations.rst +++ b/Documentation/filesystems/iomap/operations.rst @@ -208,7 +208,7 @@ The filesystem must arrange to `cancel such `reservations `_ because writeback will not consume the reservation. -The ``iomap_file_buffered_write_punch_delalloc`` can be called from a +The ``iomap_write_delalloc_release`` can be called from a ``->iomap_end`` function to find all the clean areas of the folios caching a fresh (``IOMAP_F_NEW``) delalloc mapping. It takes the ``invalidate_lock``. diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c index 884891ac7a226c..a350dac1bf5136 100644 --- a/fs/iomap/buffered-io.c +++ b/fs/iomap/buffered-io.c @@ -1145,10 +1145,36 @@ static void iomap_write_delalloc_scan(struct inode *inode, } /* + * When a short write occurs, the filesystem might need to use ->iomap_end + * to remove space reservations created in ->iomap_begin. + * + * For filesystems that use delayed allocation, there can be dirty pages over + * the delalloc extent outside the range of a short write but still within the + * delalloc extent allocated for this iomap if the write raced with page + * faults. + * * Punch out all the delalloc blocks in the range given except for those that * have dirty data still pending in the page cache - those are going to be * written and so must still retain the delalloc backing for writeback. * + * The punch() callback *must* only punch delalloc extents in the range passed + * to it. It must skip over all other types of extents in the range and leave + * them completely unchanged. It must do this punch atomically with respect to + * other extent modifications. + * + * The punch() callback may be called with a folio locked to prevent writeback + * extent allocation racing at the edge of the range we are currently punching. + * The locked folio may or may not cover the range being punched, so it is not + * safe for the punch() callback to lock folios itself. + * + * Lock order is: + * + * inode->i_rwsem (shared or exclusive) + * inode->i_mapping->invalidate_lock (exclusive) + * folio_lock() + * ->punch + * internal filesystem allocation lock + * * As we are scanning the page cache for data, we don't need to reimplement the * wheel - mapping_seek_hole_data() does exactly what we need to identify the * start and end of data ranges correctly even for sub-folio block sizes. This @@ -1177,7 +1203,7 @@ static void iomap_write_delalloc_scan(struct inode *inode, * require sprinkling this code with magic "+ 1" and "- 1" arithmetic and expose * the code to subtle off-by-one bugs.... */ -static void iomap_write_delalloc_release(struct inode *inode, loff_t start_byte, +void iomap_write_delalloc_release(struct inode *inode, loff_t start_byte, loff_t end_byte, unsigned flags, struct iomap *iomap, iomap_punch_t punch) { @@ -1243,62 +1269,7 @@ static void iomap_write_delalloc_release(struct inode *inode, loff_t start_byte, out_unlock: filemap_invalidate_unlock(inode->i_mapping); } - -/* - * When a short write occurs, the filesystem may need to remove reserved space - * that was allocated in ->iomap_begin from it's ->iomap_end method. For - * filesystems that use delayed allocation, we need to punch out delalloc - * extents from the range that are not dirty in the page cache. As the write can - * race with page faults, there can be dirty pages over the delalloc extent - * outside the range of a short write but still within the delalloc extent - * allocated for this iomap. - * - * This function uses [start_byte, end_byte) intervals (i.e. open ended) to - * simplify range iterations. - * - * The punch() callback *must* only punch delalloc extents in the range passed - * to it. It must skip over all other types of extents in the range and leave - * them completely unchanged. It must do this punch atomically with respect to - * other extent modifications. - * - * The punch() callback may be called with a folio locked to prevent writeback - * extent allocation racing at the edge of the range we are currently punching. - * The locked folio may or may not cover the range being punched, so it is not - * safe for the punch() callback to lock folios itself. - * - * Lock order is: - * - * inode->i_rwsem (shared or exclusive) - * inode->i_mapping->invalidate_lock (exclusive) - * folio_lock() - * ->punch - * internal filesystem allocation lock - */ -void iomap_file_buffered_write_punch_delalloc(struct inode *inode, - loff_t pos, loff_t length, ssize_t written, unsigned flags, - struct iomap *iomap, iomap_punch_t punch) -{ - loff_t start_byte; - loff_t end_byte; - - if (iomap->type != IOMAP_DELALLOC) - return; - - /* If we didn't reserve the blocks, we're not allowed to punch them. */ - if (!(iomap->flags & IOMAP_F_NEW)) - return; - - start_byte = iomap_last_written_block(inode, pos, written); - end_byte = round_up(pos + length, i_blocksize(inode)); - - /* Nothing to do if we've written the entire delalloc extent */ - if (start_byte >= end_byte) - return; - - iomap_write_delalloc_release(inode, start_byte, end_byte, flags, iomap, - punch); -} -EXPORT_SYMBOL_GPL(iomap_file_buffered_write_punch_delalloc); +EXPORT_SYMBOL_GPL(iomap_write_delalloc_release); static loff_t iomap_unshare_iter(struct iomap_iter *iter) { diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c index 1e11f48814c0d0..30f2530b6d5461 100644 --- a/fs/xfs/xfs_iomap.c +++ b/fs/xfs/xfs_iomap.c @@ -1227,8 +1227,20 @@ xfs_buffered_write_iomap_end( unsigned flags, struct iomap *iomap) { - iomap_file_buffered_write_punch_delalloc(inode, offset, length, written, - flags, iomap, &xfs_buffered_write_delalloc_punch); + loff_t start_byte, end_byte; + + /* If we didn't reserve the blocks, we're not allowed to punch them. */ + if (iomap->type != IOMAP_DELALLOC || !(iomap->flags & IOMAP_F_NEW)) + return 0; + + /* Nothing to do if we've written the entire delalloc extent */ + start_byte = iomap_last_written_block(inode, offset, written); + end_byte = round_up(offset + length, i_blocksize(inode)); + if (start_byte >= end_byte) + return 0; + + iomap_write_delalloc_release(inode, start_byte, end_byte, flags, iomap, + xfs_buffered_write_delalloc_punch); return 0; } diff --git a/include/linux/iomap.h b/include/linux/iomap.h index 62253739dedcbe..d0420e962ffdc2 100644 --- a/include/linux/iomap.h +++ b/include/linux/iomap.h @@ -290,9 +290,9 @@ vm_fault_t iomap_page_mkwrite(struct vm_fault *vmf, typedef void (*iomap_punch_t)(struct inode *inode, loff_t offset, loff_t length, struct iomap *iomap); -void iomap_file_buffered_write_punch_delalloc(struct inode *inode, loff_t pos, - loff_t length, ssize_t written, unsigned flag, - struct iomap *iomap, iomap_punch_t punch); +void iomap_write_delalloc_release(struct inode *inode, loff_t start_byte, + loff_t end_byte, unsigned flags, struct iomap *iomap, + iomap_punch_t punch); int iomap_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, u64 start, u64 len, const struct iomap_ops *ops); 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Wong" Cc: linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org Subject: [PATCH 03/10] iomap: move locking out of iomap_write_delalloc_release Date: Tue, 24 Sep 2024 09:40:45 +0200 Message-ID: <20240924074115.1797231-4-hch@lst.de> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240924074115.1797231-1-hch@lst.de> References: <20240924074115.1797231-1-hch@lst.de> Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html XFS (which currently is the only user of iomap_write_delalloc_release) already holds invalidate_lock for most zeroing operations. To be able to avoid a deadlock it needs to stop taking the lock, but doing so in iomap would leak XFS locking details into iomap. To avoid this require the caller to hold invalidate_lock when calling iomap_write_delalloc_release instead of taking it there. Signed-off-by: Christoph Hellwig Reviewed-by: Darrick J. Wong --- fs/iomap/buffered-io.c | 17 ++++++++--------- fs/xfs/xfs_iomap.c | 2 ++ 2 files changed, 10 insertions(+), 9 deletions(-) diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c index a350dac1bf5136..b9e70e30a1b254 100644 --- a/fs/iomap/buffered-io.c +++ b/fs/iomap/buffered-io.c @@ -1211,12 +1211,13 @@ void iomap_write_delalloc_release(struct inode *inode, loff_t start_byte, loff_t scan_end_byte = min(i_size_read(inode), end_byte); /* - * Lock the mapping to avoid races with page faults re-instantiating - * folios and dirtying them via ->page_mkwrite whilst we walk the - * cache and perform delalloc extent removal. Failing to do this can - * leave dirty pages with no space reservation in the cache. + * The caller must hold invalidate_lock to avoid races with page faults + * re-instantiating folios and dirtying them via ->page_mkwrite whilst + * we walk the cache and perform delalloc extent removal. Failing to do + * this can leave dirty pages with no space reservation in the cache. */ - filemap_invalidate_lock(inode->i_mapping); + lockdep_assert_held_write(&inode->i_mapping->invalidate_lock); + while (start_byte < scan_end_byte) { loff_t data_end; @@ -1233,7 +1234,7 @@ void iomap_write_delalloc_release(struct inode *inode, loff_t start_byte, if (start_byte == -ENXIO || start_byte == scan_end_byte) break; if (WARN_ON_ONCE(start_byte < 0)) - goto out_unlock; + return; WARN_ON_ONCE(start_byte < punch_start_byte); WARN_ON_ONCE(start_byte > scan_end_byte); @@ -1244,7 +1245,7 @@ void iomap_write_delalloc_release(struct inode *inode, loff_t start_byte, data_end = mapping_seek_hole_data(inode->i_mapping, start_byte, scan_end_byte, SEEK_HOLE); if (WARN_ON_ONCE(data_end < 0)) - goto out_unlock; + return; /* * If we race with post-direct I/O invalidation of the page cache, @@ -1266,8 +1267,6 @@ void iomap_write_delalloc_release(struct inode *inode, loff_t start_byte, if (punch_start_byte < end_byte) punch(inode, punch_start_byte, end_byte - punch_start_byte, iomap); -out_unlock: - filemap_invalidate_unlock(inode->i_mapping); } EXPORT_SYMBOL_GPL(iomap_write_delalloc_release); diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c index 30f2530b6d5461..01324da63fcfc7 100644 --- a/fs/xfs/xfs_iomap.c +++ b/fs/xfs/xfs_iomap.c @@ -1239,8 +1239,10 @@ xfs_buffered_write_iomap_end( if (start_byte >= end_byte) return 0; + filemap_invalidate_lock(inode->i_mapping); iomap_write_delalloc_release(inode, start_byte, end_byte, flags, iomap, xfs_buffered_write_delalloc_punch); + filemap_invalidate_unlock(inode->i_mapping); return 0; } From patchwork Tue Sep 24 07:40:46 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 13810418 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8F85814D6ED; Tue, 24 Sep 2024 07:41:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.137.202.133 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727163693; cv=none; b=YJyeUy9rkZOkRhTHcxmGvVo35cdjAzRZhXaWyhcR4AEsHLfnwrrKwxCOMLbDvWGaHOMaodlrhhfJzEdcfbWfrl1hd/HHg7qiOFmeXoNyX5XcqOPRuaKXXpbE+yNQfQJzcFwPwR5iqmEakqK4gQu6CbPuos24VPlbvU+My570zDQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727163693; c=relaxed/simple; bh=nZjJmKpMm8ZBtnOAVKECTVFjT41bhblSGnQ/8mPywis=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=hK3gNF6faEBTONj0vJodSy4Ta9iIqf+oAaydrizU1OYTiOvASz3F8+oe6guH8oerG9R6sxDfOy9nfz6oi9QKx/aAIPJku6F8JTsykmVc4we8IUUKmFzAXPJJ0XRyXzXyhC9h1rkzaqh64IJXybVQATmgAFDqzd0rxOZ58zm/Z/k= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de; spf=none smtp.mailfrom=bombadil.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=MO1sP74O; arc=none smtp.client-ip=198.137.202.133 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=bombadil.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="MO1sP74O" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From:Sender :Reply-To:Content-Type:Content-ID:Content-Description; bh=4AIJn7Zl7wCUZ7QHTaZaN6UoG7lkQkbVKaBIMBlzBY0=; b=MO1sP74OQ8WVo/WXJ67c2pwHGF WcxlV16mFzXcG7GdRxm13SpY8MHfW9xxqgSKA8QjCY2NiO7cQLFWWPVbing2QKXh5yA0pn4oj3CEL u3qrgKqohl9yh48rtPfTwrTAmETrTgrQE5AjMrHwFH9WEo5T+Q8cJUtAz9UpxLpeyp/g3xwKnP/MC nzHKLFWMrnGwOAoGHTPtWYkVstZj/wST51KSsdjumjZMdgbZc4vy1E8rKyKuPvjc6pliisgQDfZAs szCAaoUDE7U2kE0H7UVCQEaLUv060uK+jS8XOoUhhSfpkZIhiBdZVHo7HXCmz43/LtAyEnCx/MoH5 WwqkQ1hQ==; Received: from 2a02-8389-2341-5b80-b62d-f525-8e84-d569.cable.dynamic.v6.surfer.at ([2a02:8389:2341:5b80:b62d:f525:8e84:d569] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.98 #2 (Red Hat Linux)) id 1st0As-00000001SL4-2iIR; Tue, 24 Sep 2024 07:41:31 +0000 From: Christoph Hellwig To: Chandan Babu R , Carlos Maiolino , Christian Brauner , "Darrick J. Wong" Cc: linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org Subject: [PATCH 04/10] xfs: factor out a xfs_file_write_zero_eof helper Date: Tue, 24 Sep 2024 09:40:46 +0200 Message-ID: <20240924074115.1797231-5-hch@lst.de> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240924074115.1797231-1-hch@lst.de> References: <20240924074115.1797231-1-hch@lst.de> Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Split a helper from xfs_file_write_checks that just deal with the post-EOF zeroing to keep the code readable. Signed-off-by: Christoph Hellwig Reviewed-by: Darrick J. Wong --- fs/xfs/xfs_file.c | 140 +++++++++++++++++++++++++++------------------- 1 file changed, 82 insertions(+), 58 deletions(-) diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c index 412b1d71b52b7d..3efb0da2a910d6 100644 --- a/fs/xfs/xfs_file.c +++ b/fs/xfs/xfs_file.c @@ -347,10 +347,77 @@ xfs_file_splice_read( return ret; } +/* + * Take care of zeroing post-EOF blocks when they might exist. + * + * Returns 0 if successfully, a negative error for a failure, or 1 if this + * function dropped the iolock and reacquired it exclusively and the caller + * needs to restart the write sanity checks. + */ +static ssize_t +xfs_file_write_zero_eof( + struct kiocb *iocb, + struct iov_iter *from, + unsigned int *iolock, + size_t count, + bool *drained_dio) +{ + struct xfs_inode *ip = XFS_I(iocb->ki_filp->f_mapping->host); + loff_t isize; + + /* + * We need to serialise against EOF updates that occur in IO completions + * here. We want to make sure that nobody is changing the size while + * we do this check until we have placed an IO barrier (i.e. hold + * XFS_IOLOCK_EXCL) that prevents new IO from being dispatched. The + * spinlock effectively forms a memory barrier once we have + * XFS_IOLOCK_EXCL so we are guaranteed to see the latest EOF value and + * hence be able to correctly determine if we need to run zeroing. + */ + spin_lock(&ip->i_flags_lock); + isize = i_size_read(VFS_I(ip)); + if (iocb->ki_pos <= isize) { + spin_unlock(&ip->i_flags_lock); + return 0; + } + spin_unlock(&ip->i_flags_lock); + + if (iocb->ki_flags & IOCB_NOWAIT) + return -EAGAIN; + + if (!*drained_dio) { + /* + * If zeroing is needed and we are currently holding the iolock + * shared, we need to update it to exclusive which implies + * having to redo all checks before. + */ + if (*iolock == XFS_IOLOCK_SHARED) { + xfs_iunlock(ip, *iolock); + *iolock = XFS_IOLOCK_EXCL; + xfs_ilock(ip, *iolock); + iov_iter_reexpand(from, count); + } + + /* + * We now have an IO submission barrier in place, but AIO can do + * EOF updates during IO completion and hence we now need to + * wait for all of them to drain. Non-AIO DIO will have drained + * before we are given the XFS_IOLOCK_EXCL, and so for most + * cases this wait is a no-op. + */ + inode_dio_wait(VFS_I(ip)); + *drained_dio = true; + return 1; + } + + trace_xfs_zero_eof(ip, isize, iocb->ki_pos - isize); + return xfs_zero_range(ip, isize, iocb->ki_pos - isize, NULL); +} + /* * Common pre-write limit and setup checks. * - * Called with the iolocked held either shared and exclusive according to + * Called with the iolock held either shared and exclusive according to * @iolock, and returns with it held. Might upgrade the iolock to exclusive * if called for a direct write beyond i_size. */ @@ -360,13 +427,10 @@ xfs_file_write_checks( struct iov_iter *from, unsigned int *iolock) { - struct file *file = iocb->ki_filp; - struct inode *inode = file->f_mapping->host; - struct xfs_inode *ip = XFS_I(inode); - ssize_t error = 0; + struct inode *inode = iocb->ki_filp->f_mapping->host; size_t count = iov_iter_count(from); bool drained_dio = false; - loff_t isize; + ssize_t error; restart: error = generic_write_checks(iocb, from); @@ -389,7 +453,7 @@ xfs_file_write_checks( * exclusively. */ if (*iolock == XFS_IOLOCK_SHARED && !IS_NOSEC(inode)) { - xfs_iunlock(ip, *iolock); + xfs_iunlock(XFS_I(inode), *iolock); *iolock = XFS_IOLOCK_EXCL; error = xfs_ilock_iocb(iocb, *iolock); if (error) { @@ -400,64 +464,24 @@ xfs_file_write_checks( } /* - * If the offset is beyond the size of the file, we need to zero any + * If the offset is beyond the size of the file, we need to zero all * blocks that fall between the existing EOF and the start of this - * write. If zeroing is needed and we are currently holding the iolock - * shared, we need to update it to exclusive which implies having to - * redo all checks before. - * - * We need to serialise against EOF updates that occur in IO completions - * here. We want to make sure that nobody is changing the size while we - * do this check until we have placed an IO barrier (i.e. hold the - * XFS_IOLOCK_EXCL) that prevents new IO from being dispatched. The - * spinlock effectively forms a memory barrier once we have the - * XFS_IOLOCK_EXCL so we are guaranteed to see the latest EOF value and - * hence be able to correctly determine if we need to run zeroing. + * write. * - * We can do an unlocked check here safely as IO completion can only - * extend EOF. Truncate is locked out at this point, so the EOF can - * not move backwards, only forwards. Hence we only need to take the - * slow path and spin locks when we are at or beyond the current EOF. + * We can do an unlocked check for i_size here safely as I/O completion + * can only extend EOF. Truncate is locked out at this point, so the + * EOF can not move backwards, only forwards. Hence we only need to take + * the slow path when we are at or beyond the current EOF. */ - if (iocb->ki_pos <= i_size_read(inode)) - goto out; - - spin_lock(&ip->i_flags_lock); - isize = i_size_read(inode); - if (iocb->ki_pos > isize) { - spin_unlock(&ip->i_flags_lock); - - if (iocb->ki_flags & IOCB_NOWAIT) - return -EAGAIN; - - if (!drained_dio) { - if (*iolock == XFS_IOLOCK_SHARED) { - xfs_iunlock(ip, *iolock); - *iolock = XFS_IOLOCK_EXCL; - xfs_ilock(ip, *iolock); - iov_iter_reexpand(from, count); - } - /* - * We now have an IO submission barrier in place, but - * AIO can do EOF updates during IO completion and hence - * we now need to wait for all of them to drain. Non-AIO - * DIO will have drained before we are given the - * XFS_IOLOCK_EXCL, and so for most cases this wait is a - * no-op. - */ - inode_dio_wait(inode); - drained_dio = true; + if (iocb->ki_pos > i_size_read(inode)) { + error = xfs_file_write_zero_eof(iocb, from, iolock, count, + &drained_dio); + if (error == 1) goto restart; - } - - trace_xfs_zero_eof(ip, isize, iocb->ki_pos - isize); - error = xfs_zero_range(ip, isize, iocb->ki_pos - isize, NULL); if (error) return error; - } else - spin_unlock(&ip->i_flags_lock); + } -out: return kiocb_modified(iocb); } From patchwork Tue Sep 24 07:40:47 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 13810419 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6B04F148316; Tue, 24 Sep 2024 07:41:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.137.202.133 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727163695; cv=none; b=NqZ/LC6yf/atsrtMKu2Dx4qnPVkgoGBG3FD8TZzUwJYgZlRNDZJRLZ1l6Vty8Cslbys7/M/W8znAsrYZaR6UJetK3tdMhYrQQN6GSrE97uesXB8gWSmZCZjXjGhHrG1+N7f9uRNVvbzjxd4A0l00TGjVGxL01wx/3+yw2K98/bA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727163695; c=relaxed/simple; bh=69Bnqoynyjn/q+9NvkuWoLJnxVVYEkGzpkA69xAZ4gA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=UzdSy1cFJeP9YdiI8tZUAMUDFZ3u0qsakFwNfaudRxz9RfQ8hWJ0gayNxT4Z/6ufCCygMI7426ap6xc1pMsBRoVQr5ezq/e6ZC7vHBUcB1KFf9Pjgh2epP36/n5Skd6Wtgz/nTOpi+9RY6A86MExWx4i4uq9zddlCv6nJ3SIwGQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de; spf=none smtp.mailfrom=bombadil.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=4F5HMWix; arc=none smtp.client-ip=198.137.202.133 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=bombadil.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="4F5HMWix" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From:Sender :Reply-To:Content-Type:Content-ID:Content-Description; bh=ey5NM8CBmP9xc4LLpfl6+DouXpz8NtpPwdSJkTH6978=; b=4F5HMWixQfM03ALlk/hw80X2Qh fnFXRTYZ87cSL0aZH5WVx5UHLdBSpILxUwK/EljSWT/XZKWDC6tRAkrj6JwOcQSfO2NH0+WZVolhZ 9LealM8/6H4dUeSNUBiYltyHZjdg0Uvplvsc7Q1XMBjLFij6iQUpYTcHzF2oHplGVzLRegJiw3Lr4 zFvUMCeXiM4JgYXlfEiPr++0wi/d+oYMuFRFgdCuDG6Li+GkbuPGuM5CX4hq33pno3W6nO18Vlkx0 SoqXQDJ8vmbULNDf4ENkF98LuMWaAcCv1vttUcesYbLmbqppn/2Zv3lcPdKvE3x2pmVSzeL5xO+DK 94jWEYeg==; Received: from 2a02-8389-2341-5b80-b62d-f525-8e84-d569.cable.dynamic.v6.surfer.at ([2a02:8389:2341:5b80:b62d:f525:8e84:d569] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.98 #2 (Red Hat Linux)) id 1st0Av-00000001SLW-2Of6; Tue, 24 Sep 2024 07:41:33 +0000 From: Christoph Hellwig To: Chandan Babu R , Carlos Maiolino , Christian Brauner , "Darrick J. Wong" Cc: linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org Subject: [PATCH 05/10] xfs: take XFS_MMAPLOCK_EXCL xfs_file_write_zero_eof Date: Tue, 24 Sep 2024 09:40:47 +0200 Message-ID: <20240924074115.1797231-6-hch@lst.de> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240924074115.1797231-1-hch@lst.de> References: <20240924074115.1797231-1-hch@lst.de> Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html xfs_file_write_zero_eof is the only caller of xfs_zero_range that does not take XFS_MMAPLOCK_EXCL (aka the invalidate lock). Currently that is actually the right thing, as an error in the iomap zeroing code will also take the invalidate_lock to clean up, but to fix that deadlock we need a consistent locking pattern first. The only extra thing that XFS_MMAPLOCK_EXCL will lock out are read pagefaults, which isn't really needed here, but also not actively harmful. Signed-off-by: Christoph Hellwig Reviewed-by: Darrick J. Wong --- fs/xfs/xfs_file.c | 8 +++++++- fs/xfs/xfs_iomap.c | 2 ++ 2 files changed, 9 insertions(+), 1 deletion(-) diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c index 3efb0da2a910d6..b19916b11fd563 100644 --- a/fs/xfs/xfs_file.c +++ b/fs/xfs/xfs_file.c @@ -364,6 +364,7 @@ xfs_file_write_zero_eof( { struct xfs_inode *ip = XFS_I(iocb->ki_filp->f_mapping->host); loff_t isize; + int error; /* * We need to serialise against EOF updates that occur in IO completions @@ -411,7 +412,12 @@ xfs_file_write_zero_eof( } trace_xfs_zero_eof(ip, isize, iocb->ki_pos - isize); - return xfs_zero_range(ip, isize, iocb->ki_pos - isize, NULL); + + xfs_ilock(ip, XFS_MMAPLOCK_EXCL); + error = xfs_zero_range(ip, isize, iocb->ki_pos - isize, NULL); + xfs_iunlock(ip, XFS_MMAPLOCK_EXCL); + + return error; } /* diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c index 01324da63fcfc7..4fa4d66dc37761 100644 --- a/fs/xfs/xfs_iomap.c +++ b/fs/xfs/xfs_iomap.c @@ -1449,6 +1449,8 @@ xfs_zero_range( { struct inode *inode = VFS_I(ip); + xfs_assert_ilocked(ip, XFS_IOLOCK_EXCL | XFS_MMAPLOCK_EXCL); + if (IS_DAX(inode)) return dax_zero_range(inode, pos, len, did_zero, &xfs_dax_write_iomap_ops); From patchwork Tue Sep 24 07:40:48 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 13810420 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id F24B0148316; Tue, 24 Sep 2024 07:41:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.137.202.133 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727163698; cv=none; b=jxIN/Hc90slj6DKEOecQf5MmFq0eanpE72PYpQfNpCiuiJ4ZdfcCXSVKswnn0lf8gb6VYx0d8LpzqSo/E0DhthvzlugRlY2tEdu5/lCeCr+qMri657RD7DERymX+YZXylCaYvacQZECepUo7/UWpEWNuU2SsRc494xrm0ozw0po= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727163698; c=relaxed/simple; bh=WwkOtBxAHOCe3ChfEuy+WpbWlvtgUZdos5uae62up1c=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=qXnRops6KH4fzd9n7qpJMjCbuMtLBJTWlhbGMwCbJzn7IGaOW+uodhbUPE+Zn5q8L/AlMSIZghVXRAh4oGtxEWTg90b1VfbbZQPhdhpIxI9A4nLp7MdXctVYdBFm41B5ErSrdjh4e+a3zmVjtxFxMGd4v6q6cXIb7dOMfBXFHPk= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de; spf=none smtp.mailfrom=bombadil.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=EOw4owjl; arc=none smtp.client-ip=198.137.202.133 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=bombadil.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="EOw4owjl" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From:Sender :Reply-To:Content-Type:Content-ID:Content-Description; bh=/3H48UhQGIVnkCntEamRIwbyShYar0tUIgYAmPnVW3E=; b=EOw4owjlTwVz1LKdgU3mWV9gz/ zkdk8clIJsfvPt1SQuOt/D5Ga1pOwqdYcbhi3KcRNvLmPIpT8m58Tfh7TCxUsnAw9hSm8vASU0WF4 X2etIRdV3E4DZ6Foyv6CrHWy2NRluD6z1Cjfbs4t/ysL0t3Dm42JfkPKNMjLZx/yXwOWN0LBxyo+7 4GRMAE83rj06uoiNE3wa46CGukFTYYd3FaD7kemsEIplSPGli4nvBRdO7Phr1Pjpj/8mXbfMNmWw4 S5JMeCqQM0Vig8AplzZ21hT0WLlU7V6xBA8RCTyWr1OcrCuIkRxGlFUqMQhtGQ2LHKq5Bs/aJtRkP ym0f8bdA==; Received: from 2a02-8389-2341-5b80-b62d-f525-8e84-d569.cable.dynamic.v6.surfer.at ([2a02:8389:2341:5b80:b62d:f525:8e84:d569] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.98 #2 (Red Hat Linux)) id 1st0Ay-00000001SLo-0uOW; Tue, 24 Sep 2024 07:41:36 +0000 From: Christoph Hellwig To: Chandan Babu R , Carlos Maiolino , Christian Brauner , "Darrick J. Wong" Cc: linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org Subject: [PATCH 06/10] xfs: zeroing already holds invalidate_lock Date: Tue, 24 Sep 2024 09:40:48 +0200 Message-ID: <20240924074115.1797231-7-hch@lst.de> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240924074115.1797231-1-hch@lst.de> References: <20240924074115.1797231-1-hch@lst.de> Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html All XFS callers of iomap_zero_range already hold invalidate_lock, so we can't take it again in iomap_file_buffered_write_punch_delalloc. Use the passed in flags argument to detect if we're called from a zeroing operation and don't take the lock again in this case. Signed-off-by: Christoph Hellwig Reviewed-by: Darrick J. Wong --- fs/xfs/xfs_iomap.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c index 4fa4d66dc37761..0f5fa3de6d3ecc 100644 --- a/fs/xfs/xfs_iomap.c +++ b/fs/xfs/xfs_iomap.c @@ -1239,10 +1239,17 @@ xfs_buffered_write_iomap_end( if (start_byte >= end_byte) return 0; - filemap_invalidate_lock(inode->i_mapping); + /* For zeroing operations the callers already hold invalidate_lock. */ + if (flags & IOMAP_ZERO) + rwsem_assert_held_write(&inode->i_mapping->invalidate_lock); + else + filemap_invalidate_lock(inode->i_mapping); + iomap_write_delalloc_release(inode, start_byte, end_byte, flags, iomap, xfs_buffered_write_delalloc_punch); - filemap_invalidate_unlock(inode->i_mapping); + + if (!(flags & IOMAP_ZERO)) + filemap_invalidate_unlock(inode->i_mapping); return 0; } From patchwork Tue Sep 24 07:40:49 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 13810421 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E1FBE1487DC; Tue, 24 Sep 2024 07:41:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.137.202.133 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727163702; cv=none; b=Cx9oegnWuz/5qtoKb9c/03aewR5/iwQqvkGMu3Qzh5yKKhAS18513N9RtY4JU6QNTERhVWSpkS8o2yCLmHe6s2zdmN0DseFnjNoi4W5mXdEKgGDAXm4ObbSKhI+Vh8Hy5aw9b8re8dTEoIFfpO3Wuo8OqqeATSxOqT1JHkdj5Ps= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727163702; c=relaxed/simple; bh=V9Jz/6LVLpqA/dtultxlwZ9m1FcOSqUllqpPGWGDT9c=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=rQzOrHYEJ47KBU8Xfz5hIXIhud+1HufvZ1N+S/njmZ84m7gYVb2PYw6eJKTSRa+8bSukUvl4uOg6K7dj4q6c0EGB3BHKO6Q0sgwx5QH4gsYxThKv50RfcasoQh042NeOwQOLbcxlyCk2QXBG3hjazKFlZkiu3PCtFEeRYati34Q= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de; spf=none smtp.mailfrom=bombadil.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=j5v3J2X6; arc=none smtp.client-ip=198.137.202.133 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=bombadil.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="j5v3J2X6" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From:Sender :Reply-To:Content-Type:Content-ID:Content-Description; bh=OwCqzl82yaTEWOGRQclLTI1lTfAlTt+iwgHf0T8p794=; b=j5v3J2X6k+RdRLSZWMM2+MPPzP rtUIJTmKl6HEkvT0SjuMfM9sXZEsS34bfl2Rckh+PVQzh1CmY0i0lh+kPmCQVGOpDnurZ3hQOtJQs 4JPx6qa8QI5ll5F2nJoAKHKeb5s2k/zZrOxdzd32zXHnOAhpGK9xupi4U1tO1De3p+HaOALqkTdWy vNUFizXBqO8MRtF0DW3jvUkjoK3JYomRUMu43x9uMvrn0rMs3NhrJIEkzM/WNIyWU2qytDHchN6bE FdUkUENEu4RbyMUamnu9LGeMY5IsfIwQZNQceIiDaa2CfzN9N4kN57cqtCeZfXHB8GhBq/pbyHY/2 48dwjvjA==; Received: from 2a02-8389-2341-5b80-b62d-f525-8e84-d569.cable.dynamic.v6.surfer.at ([2a02:8389:2341:5b80:b62d:f525:8e84:d569] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.98 #2 (Red Hat Linux)) id 1st0B1-00000001SML-3Pyt; Tue, 24 Sep 2024 07:41:40 +0000 From: Christoph Hellwig To: Chandan Babu R , Carlos Maiolino , Christian Brauner , "Darrick J. Wong" Cc: linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org Subject: [PATCH 07/10] xfs: support the COW fork in xfs_bmap_punch_delalloc_range Date: Tue, 24 Sep 2024 09:40:49 +0200 Message-ID: <20240924074115.1797231-8-hch@lst.de> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240924074115.1797231-1-hch@lst.de> References: <20240924074115.1797231-1-hch@lst.de> Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html xfs_buffered_write_iomap_begin can also create delallocate reservations that need cleaning up, prepare for that by adding support for the COW fork in xfs_bmap_punch_delalloc_range. Signed-off-by: Christoph Hellwig Reviewed-by: Darrick J. Wong --- fs/xfs/xfs_aops.c | 4 ++-- fs/xfs/xfs_bmap_util.c | 10 +++++++--- fs/xfs/xfs_bmap_util.h | 2 +- fs/xfs/xfs_iomap.c | 3 ++- 4 files changed, 12 insertions(+), 7 deletions(-) diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c index 6dead20338e24c..559a3a57709748 100644 --- a/fs/xfs/xfs_aops.c +++ b/fs/xfs/xfs_aops.c @@ -116,7 +116,7 @@ xfs_end_ioend( if (unlikely(error)) { if (ioend->io_flags & IOMAP_F_SHARED) { xfs_reflink_cancel_cow_range(ip, offset, size, true); - xfs_bmap_punch_delalloc_range(ip, offset, + xfs_bmap_punch_delalloc_range(ip, XFS_DATA_FORK, offset, offset + size); } goto done; @@ -456,7 +456,7 @@ xfs_discard_folio( * byte of the next folio. Hence the end offset is only dependent on the * folio itself and not the start offset that is passed in. */ - xfs_bmap_punch_delalloc_range(ip, pos, + xfs_bmap_punch_delalloc_range(ip, XFS_DATA_FORK, pos, folio_pos(folio) + folio_size(folio)); } diff --git a/fs/xfs/xfs_bmap_util.c b/fs/xfs/xfs_bmap_util.c index 053d567c910840..4719ec90029cb7 100644 --- a/fs/xfs/xfs_bmap_util.c +++ b/fs/xfs/xfs_bmap_util.c @@ -442,11 +442,12 @@ xfs_getbmap( void xfs_bmap_punch_delalloc_range( struct xfs_inode *ip, + int whichfork, xfs_off_t start_byte, xfs_off_t end_byte) { struct xfs_mount *mp = ip->i_mount; - struct xfs_ifork *ifp = &ip->i_df; + struct xfs_ifork *ifp = xfs_ifork_ptr(ip, whichfork); xfs_fileoff_t start_fsb = XFS_B_TO_FSBT(mp, start_byte); xfs_fileoff_t end_fsb = XFS_B_TO_FSB(mp, end_byte); struct xfs_bmbt_irec got, del; @@ -474,11 +475,14 @@ xfs_bmap_punch_delalloc_range( continue; } - xfs_bmap_del_extent_delay(ip, XFS_DATA_FORK, &icur, &got, &del); + xfs_bmap_del_extent_delay(ip, whichfork, &icur, &got, &del); if (!xfs_iext_get_extent(ifp, &icur, &got)) break; } + if (whichfork == XFS_COW_FORK && !ifp->if_bytes) + xfs_inode_clear_cowblocks_tag(ip); + out_unlock: xfs_iunlock(ip, XFS_ILOCK_EXCL); } @@ -580,7 +584,7 @@ xfs_free_eofblocks( */ if (ip->i_diflags & (XFS_DIFLAG_PREALLOC | XFS_DIFLAG_APPEND)) { if (ip->i_delayed_blks) { - xfs_bmap_punch_delalloc_range(ip, + xfs_bmap_punch_delalloc_range(ip, XFS_DATA_FORK, round_up(XFS_ISIZE(ip), mp->m_sb.sb_blocksize), LLONG_MAX); } diff --git a/fs/xfs/xfs_bmap_util.h b/fs/xfs/xfs_bmap_util.h index eb0895bfb9dae4..b29760d36e1ab1 100644 --- a/fs/xfs/xfs_bmap_util.h +++ b/fs/xfs/xfs_bmap_util.h @@ -30,7 +30,7 @@ xfs_bmap_rtalloc(struct xfs_bmalloca *ap) } #endif /* CONFIG_XFS_RT */ -void xfs_bmap_punch_delalloc_range(struct xfs_inode *ip, +void xfs_bmap_punch_delalloc_range(struct xfs_inode *ip, int whichfork, xfs_off_t start_byte, xfs_off_t end_byte); struct kgetbmap { diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c index 0f5fa3de6d3ecc..abc3b9f1115ce7 100644 --- a/fs/xfs/xfs_iomap.c +++ b/fs/xfs/xfs_iomap.c @@ -1215,7 +1215,8 @@ xfs_buffered_write_delalloc_punch( loff_t length, struct iomap *iomap) { - xfs_bmap_punch_delalloc_range(XFS_I(inode), offset, offset + length); 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Wong" Cc: linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org Subject: [PATCH 08/10] xfs: share more code in xfs_buffered_write_iomap_begin Date: Tue, 24 Sep 2024 09:40:50 +0200 Message-ID: <20240924074115.1797231-9-hch@lst.de> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240924074115.1797231-1-hch@lst.de> References: <20240924074115.1797231-1-hch@lst.de> Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Introduce a local iomap_flags variable so that the code allocating new delalloc blocks in the data fork can fall through to the found_imap label and reuse the code to unlock and fill the iomap. Signed-off-by: Christoph Hellwig Reviewed-by: Darrick J. Wong --- fs/xfs/xfs_iomap.c | 18 ++++++++---------- 1 file changed, 8 insertions(+), 10 deletions(-) diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c index abc3b9f1115ce7..aff9e8305399ee 100644 --- a/fs/xfs/xfs_iomap.c +++ b/fs/xfs/xfs_iomap.c @@ -975,6 +975,7 @@ xfs_buffered_write_iomap_begin( int allocfork = XFS_DATA_FORK; int error = 0; unsigned int lockmode = XFS_ILOCK_EXCL; + unsigned int iomap_flags = 0; u64 seq; if (xfs_is_shutdown(mp)) @@ -1145,6 +1146,11 @@ xfs_buffered_write_iomap_begin( } } + /* + * Flag newly allocated delalloc blocks with IOMAP_F_NEW so we punch + * them out if the write happens to fail. + */ + iomap_flags |= IOMAP_F_NEW; if (allocfork == XFS_COW_FORK) { error = xfs_bmapi_reserve_delalloc(ip, allocfork, offset_fsb, end_fsb - offset_fsb, prealloc_blocks, &cmap, @@ -1162,19 +1168,11 @@ xfs_buffered_write_iomap_begin( if (error) goto out_unlock; - /* - * Flag newly allocated delalloc blocks with IOMAP_F_NEW so we punch - * them out if the write happens to fail. - */ - seq = xfs_iomap_inode_sequence(ip, IOMAP_F_NEW); - xfs_iunlock(ip, lockmode); trace_xfs_iomap_alloc(ip, offset, count, allocfork, &imap); - return xfs_bmbt_to_iomap(ip, iomap, &imap, flags, IOMAP_F_NEW, seq); - found_imap: - seq = xfs_iomap_inode_sequence(ip, 0); + seq = xfs_iomap_inode_sequence(ip, iomap_flags); xfs_iunlock(ip, lockmode); - return xfs_bmbt_to_iomap(ip, iomap, &imap, flags, 0, seq); + return xfs_bmbt_to_iomap(ip, iomap, &imap, flags, iomap_flags, seq); convert_delay: xfs_iunlock(ip, lockmode); From patchwork Tue Sep 24 07:40:51 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 13810423 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 94F61148316; Tue, 24 Sep 2024 07:41:46 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.137.202.133 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727163707; cv=none; b=Xo4pqzQY2yMU9tddOlPQEnu/39GPJAgAkxH6EQpL4vYQxkZ3FRkEax3zQmS/ynIxIXSdd0cIOSYPXpM7dkTW+q5b6HbnP+lUAnqN4RdOWgXV9SDrxti1rclzjJjINqrYK+oD0CamQ3agyKdeLNQRhU40moT/6JI3Bn38L1mbiX8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727163707; c=relaxed/simple; bh=XBDS9+zFPYaTYRZiKoC57H9q+/jBQoCHNLX6kyjgK9Y=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=nGngKndJwoMu+8nrjoSXz8yatM89w6lQS0PLPGHziy9c3NrMv5qONi3WZykFCWGg+PQx6Zh0lLKx395BhKWa4CgtUZpAtJk6OyJGeMjH3hbVILONVTv722It3hXBpKvUe3uSg8wc9VxmYru/EqhFN0muMgDqH3N6MOEC4urwRR8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de; spf=none smtp.mailfrom=bombadil.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=wmW8lFUe; arc=none smtp.client-ip=198.137.202.133 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=bombadil.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="wmW8lFUe" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From:Sender :Reply-To:Content-Type:Content-ID:Content-Description; bh=0fTTsQj3ZdvTBprqSSqQ54OSPZpIeMu3ngGG0FwbbT8=; b=wmW8lFUesNcc3v1tu9HETju3h3 DEtbLjx4Q0hplObyuG7YKseXG2aSrk3bpLs5LSgY1JhyPHK4V9ZS4llLPM9DpH8qrGcNxK0tr4Y7D z+28TSRKENQeLe5K7cU/pNs+w3NkqyOuGNyzIW6+XiKz5e7hQ2QJG/g/Wf9bBjQlIpOyTqqLccV0z nfUkr1klfyRC8gSaesRsUGZC0+SZdlaB+wD5pNo4+58VJ9q5m/zAmEOYOa38MtRd3zlw0MrQOLW1d BWOhouIoJx0IufKAVAFH3EvEUy5IX/WWHMVmdZNd811d9qjI1DqLzd2JTA/j6C/wturoqgqtc7wq+ iUvM9+ZA==; Received: from 2a02-8389-2341-5b80-b62d-f525-8e84-d569.cable.dynamic.v6.surfer.at ([2a02:8389:2341:5b80:b62d:f525:8e84:d569] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.98 #2 (Red Hat Linux)) id 1st0B7-00000001SO9-3B7U; Tue, 24 Sep 2024 07:41:46 +0000 From: Christoph Hellwig To: Chandan Babu R , Carlos Maiolino , Christian Brauner , "Darrick J. Wong" Cc: linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org Subject: [PATCH 09/10] xfs: set IOMAP_F_SHARED for all COW fork allocations Date: Tue, 24 Sep 2024 09:40:51 +0200 Message-ID: <20240924074115.1797231-10-hch@lst.de> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240924074115.1797231-1-hch@lst.de> References: <20240924074115.1797231-1-hch@lst.de> Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Change to always set xfs_buffered_write_iomap_begin for COW fork allocations even if they don't overlap existing data fork extents, which will allow the iomap_end callback to detect if it has to punch stale delalloc blocks from the COW fork instead of the data fork. It also means we sample the sequence counter for both the data and the COW fork when writing to the COW fork, which ensures we properly revalidate when only COW fork changes happens. This is essentially a revert of commit 72a048c1056a ("xfs: only set IOMAP_F_SHARED when providing a srcmap to a write"). This is fine because the problem that the commit fixed has now been dealt with in iomap by only looking at the actual srcmap and not the fallback to the write iomap. Note that the direct I/O path was never changed and has always set IOMAP_F_SHARED for all COW fork allocations. Signed-off-by: Christoph Hellwig Reviewed-by: Darrick J. Wong --- fs/xfs/xfs_iomap.c | 15 +++++++-------- 1 file changed, 7 insertions(+), 8 deletions(-) diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c index aff9e8305399ee..cc768f0139d365 100644 --- a/fs/xfs/xfs_iomap.c +++ b/fs/xfs/xfs_iomap.c @@ -1186,20 +1186,19 @@ xfs_buffered_write_iomap_begin( return 0; found_cow: - seq = xfs_iomap_inode_sequence(ip, 0); if (imap.br_startoff <= offset_fsb) { - error = xfs_bmbt_to_iomap(ip, srcmap, &imap, flags, 0, seq); + error = xfs_bmbt_to_iomap(ip, srcmap, &imap, flags, 0, + xfs_iomap_inode_sequence(ip, 0)); if (error) goto out_unlock; - seq = xfs_iomap_inode_sequence(ip, IOMAP_F_SHARED); - xfs_iunlock(ip, lockmode); - return xfs_bmbt_to_iomap(ip, iomap, &cmap, flags, - IOMAP_F_SHARED, seq); + } else { + xfs_trim_extent(&cmap, offset_fsb, imap.br_startoff - offset_fsb); } - xfs_trim_extent(&cmap, offset_fsb, imap.br_startoff - offset_fsb); + iomap_flags = IOMAP_F_SHARED; + seq = xfs_iomap_inode_sequence(ip, iomap_flags); xfs_iunlock(ip, lockmode); - return xfs_bmbt_to_iomap(ip, iomap, &cmap, flags, 0, seq); + return xfs_bmbt_to_iomap(ip, iomap, &cmap, flags, iomap_flags, seq); out_unlock: xfs_iunlock(ip, lockmode); From patchwork Tue Sep 24 07:40:52 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 13810424 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4470F14830C; Tue, 24 Sep 2024 07:41:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.137.202.133 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727163710; cv=none; b=dDB9Oj+rubfCXAr+6ALqOtd0t2NtMPZUYRrqar69EzdesbshIbDm8X8Apjre7rBVuLDs+p46iTQd2eIoAQumF2+SAKyBVyYl6/f9MqYU+mYLbQZ/Cj96s3gAHFEwGJADtMmwVr/RMCRcM0fNoNFHGvJhinr5svOPkjSEZ/O1wW8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727163710; c=relaxed/simple; bh=dO7DPx9lr+A6EiTToDNsMt0eMLyFbcysQqhoPY9lCwM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Dbk1CWwJRIhmeIut5g2TxQjOhDlNw5t1cva5lVp1zeM7fnnU4KR+tfefdfRbpShE8GeiA5bdeRpNTk7l//dvtIymc7p1S2BFE0s0kzwC5KoTodcdV0uumLWpRc7SofO7D6pzxYLt2Ivpb0Trcqj+TO9aVkQjfjficknxfOJyz0A= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de; spf=none smtp.mailfrom=bombadil.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=dmqsvfRt; arc=none smtp.client-ip=198.137.202.133 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=bombadil.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="dmqsvfRt" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From:Sender :Reply-To:Content-Type:Content-ID:Content-Description; bh=YNRHAj4pG2z8wKAOo6HVGGA4NzRephlTf1ufR3qBIbg=; b=dmqsvfRt0vUo+ergFN7BL23uCq TqH+MaSkqHgHwfUt/MwCC/hzZfvwRhPTEWBLuCUU7Mc4Cuu2mcjzGnxDW2sgwZ/ioGGzvWIMDCUkR qB3L6HajqVyXu5n6sPU7hAvVIToML/7gMUjTw+FEBIgrbf3jXbB9FadaDeAGRvV890j9LpJnPFMTV sSDWMqIBVsEYY1NSo32BKs8ZntAy+4v+hB+O7rdZbL+aafnqZXEbgk8sDi4RwfWZssj0H58YRFl7k thqvARS+S5x0d5YlpzSv1u/ze/z7iwHAlz8XVnns5h24QIvPhvFVKW+GvyHMKiiUy5ADRZwFF44zt QcujZaZA==; Received: from 2a02-8389-2341-5b80-b62d-f525-8e84-d569.cable.dynamic.v6.surfer.at ([2a02:8389:2341:5b80:b62d:f525:8e84:d569] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.98 #2 (Red Hat Linux)) id 1st0BA-00000001SPf-1lhp; Tue, 24 Sep 2024 07:41:48 +0000 From: Christoph Hellwig To: Chandan Babu R , Carlos Maiolino , Christian Brauner , "Darrick J. Wong" Cc: linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org Subject: [PATCH 10/10] xfs: punch delalloc extents from the COW fork for COW writes Date: Tue, 24 Sep 2024 09:40:52 +0200 Message-ID: <20240924074115.1797231-11-hch@lst.de> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240924074115.1797231-1-hch@lst.de> References: <20240924074115.1797231-1-hch@lst.de> Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html When ->iomap_end is called on a short write to the COW fork it needs to punch stale delalloc data from the COW fork and not the data fork. Ensure that IOMAP_F_NEW is set for new COW fork allocations in xfs_buffered_write_iomap_begin, and then use the IOMAP_F_SHARED flag in xfs_buffered_write_delalloc_punch to decide which fork to punch. Signed-off-by: Christoph Hellwig Reviewed-by: Darrick J. Wong --- fs/xfs/xfs_iomap.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c index cc768f0139d365..8a4e5f14ec0c77 100644 --- a/fs/xfs/xfs_iomap.c +++ b/fs/xfs/xfs_iomap.c @@ -1195,7 +1195,7 @@ xfs_buffered_write_iomap_begin( xfs_trim_extent(&cmap, offset_fsb, imap.br_startoff - offset_fsb); } - iomap_flags = IOMAP_F_SHARED; + iomap_flags |= IOMAP_F_SHARED; seq = xfs_iomap_inode_sequence(ip, iomap_flags); xfs_iunlock(ip, lockmode); return xfs_bmbt_to_iomap(ip, iomap, &cmap, flags, iomap_flags, seq); @@ -1212,8 +1212,10 @@ xfs_buffered_write_delalloc_punch( loff_t length, struct iomap *iomap) { - xfs_bmap_punch_delalloc_range(XFS_I(inode), XFS_DATA_FORK, offset, - offset + length); + xfs_bmap_punch_delalloc_range(XFS_I(inode), + (iomap->flags & IOMAP_F_SHARED) ? + XFS_COW_FORK : XFS_DATA_FORK, + offset, offset + length); } static int