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Mon, 14 Jul 2025 13:17:28 +0000 (UTC) Received: from bfoster.redhat.com (unknown [10.22.64.43]) by mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 1B9481800285; Mon, 14 Jul 2025 13:17:26 +0000 (UTC) From: Brian Foster To: linux-fsdevel@vger.kernel.org Cc: linux-xfs@vger.kernel.org, linux-mm@kvack.org, hch@infradead.org, djwong@kernel.org, willy@infradead.org Subject: [PATCH v2 7/7] xfs: error tag to force zeroing on debug kernels Date: Mon, 14 Jul 2025 09:20:59 -0400 Message-ID: <20250714132059.288129-8-bfoster@redhat.com> In-Reply-To: <20250714132059.288129-1-bfoster@redhat.com> References: <20250714132059.288129-1-bfoster@redhat.com> MIME-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.93 X-Rspamd-Queue-Id: 80DDF16000A X-Stat-Signature: nt7ki1ig5mm45x7juxhyy63gp3fyz3hk X-Rspam-User: X-Rspamd-Server: rspam07 X-HE-Tag: 1752499053-158081 X-HE-Meta: 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 UQI+HjYS RhNHt0LHLTbSsuc/8Wwapga8oi4RGDfILKT3sAIQEEci5jbdrcnh604sJPNK+5y90bg5+IbXU0oxST1gIr2FGNE85x3j5MWLaSpfxUEIhZPcPwFxZlEqsZXtKdfhN86fP04xtIfB+0745QqQvVgbX1DORuf915waIWItP9R1lldNdD0VCPAZ0MVKqeqXPpo2khlFl5M5hXAlPgq9xkhxaRvJAdHkWmw/MuLc5DijTPb2llJvr8zpd3Gtu2kwc2Q66+krgqpNDCvOM8R/x4LhudvCicYuVKlbxbZpQddErcwNeN6K8CKT2+KTFgSNtEv7xKl0fZPPQXHaQCu0= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: iomap_zero_range() has to cover various corner cases that are difficult to test on production kernels because it is used in fairly limited use cases. For example, it is currently only used by XFS and mostly only in partial block zeroing cases. While it's possible to test most of these functional cases, we can provide more robust test coverage by co-opting fallocate zero range to invoke zeroing of the entire range instead of the more efficient block punch/allocate sequence. Add an errortag to occasionally invoke forced zeroing. Signed-off-by: Brian Foster --- fs/xfs/libxfs/xfs_errortag.h | 4 +++- fs/xfs/xfs_error.c | 3 +++ fs/xfs/xfs_file.c | 21 +++++++++++++++------ 3 files changed, 21 insertions(+), 7 deletions(-) diff --git a/fs/xfs/libxfs/xfs_errortag.h b/fs/xfs/libxfs/xfs_errortag.h index a53c5d40e084..33ca3fc2ca88 100644 --- a/fs/xfs/libxfs/xfs_errortag.h +++ b/fs/xfs/libxfs/xfs_errortag.h @@ -65,7 +65,8 @@ #define XFS_ERRTAG_WRITE_DELAY_MS 43 #define XFS_ERRTAG_EXCHMAPS_FINISH_ONE 44 #define XFS_ERRTAG_METAFILE_RESV_CRITICAL 45 -#define XFS_ERRTAG_MAX 46 +#define XFS_ERRTAG_FORCE_ZERO_RANGE 46 +#define XFS_ERRTAG_MAX 47 /* * Random factors for above tags, 1 means always, 2 means 1/2 time, etc. @@ -115,5 +116,6 @@ #define XFS_RANDOM_WRITE_DELAY_MS 3000 #define XFS_RANDOM_EXCHMAPS_FINISH_ONE 1 #define XFS_RANDOM_METAFILE_RESV_CRITICAL 4 +#define XFS_RANDOM_FORCE_ZERO_RANGE 4 #endif /* __XFS_ERRORTAG_H_ */ diff --git a/fs/xfs/xfs_error.c b/fs/xfs/xfs_error.c index dbd87e137694..00c0c391c329 100644 --- a/fs/xfs/xfs_error.c +++ b/fs/xfs/xfs_error.c @@ -64,6 +64,7 @@ static unsigned int xfs_errortag_random_default[] = { XFS_RANDOM_WRITE_DELAY_MS, XFS_RANDOM_EXCHMAPS_FINISH_ONE, XFS_RANDOM_METAFILE_RESV_CRITICAL, + XFS_RANDOM_FORCE_ZERO_RANGE, }; struct xfs_errortag_attr { @@ -183,6 +184,7 @@ XFS_ERRORTAG_ATTR_RW(wb_delay_ms, XFS_ERRTAG_WB_DELAY_MS); XFS_ERRORTAG_ATTR_RW(write_delay_ms, XFS_ERRTAG_WRITE_DELAY_MS); XFS_ERRORTAG_ATTR_RW(exchmaps_finish_one, XFS_ERRTAG_EXCHMAPS_FINISH_ONE); XFS_ERRORTAG_ATTR_RW(metafile_resv_crit, XFS_ERRTAG_METAFILE_RESV_CRITICAL); +XFS_ERRORTAG_ATTR_RW(force_zero_range, XFS_ERRTAG_FORCE_ZERO_RANGE); static struct attribute *xfs_errortag_attrs[] = { XFS_ERRORTAG_ATTR_LIST(noerror), @@ -230,6 +232,7 @@ static struct attribute *xfs_errortag_attrs[] = { XFS_ERRORTAG_ATTR_LIST(write_delay_ms), XFS_ERRORTAG_ATTR_LIST(exchmaps_finish_one), XFS_ERRORTAG_ATTR_LIST(metafile_resv_crit), + XFS_ERRORTAG_ATTR_LIST(force_zero_range), NULL, }; ATTRIBUTE_GROUPS(xfs_errortag); diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c index 0b41b18debf3..227ae8bcc217 100644 --- a/fs/xfs/xfs_file.c +++ b/fs/xfs/xfs_file.c @@ -27,6 +27,8 @@ #include "xfs_file.h" #include "xfs_aops.h" #include "xfs_zone_alloc.h" +#include "xfs_error.h" +#include "xfs_errortag.h" #include #include @@ -1269,13 +1271,20 @@ xfs_falloc_zero_range( if (error) return error; - error = xfs_free_file_space(XFS_I(inode), offset, len, ac); - if (error) - return error; + /* randomly force zeroing to exercise zero range */ + if (XFS_TEST_ERROR(false, XFS_I(inode)->i_mount, + XFS_ERRTAG_FORCE_ZERO_RANGE)) { + error = xfs_zero_range(XFS_I(inode), offset, len, ac, NULL); + } else { + error = xfs_free_file_space(XFS_I(inode), offset, len, ac); + if (error) + return error; - len = round_up(offset + len, blksize) - round_down(offset, blksize); - offset = round_down(offset, blksize); - error = xfs_alloc_file_space(XFS_I(inode), offset, len); + len = round_up(offset + len, blksize) - + round_down(offset, blksize); + offset = round_down(offset, blksize); + error = xfs_alloc_file_space(XFS_I(inode), offset, len); + } if (error) return error; return xfs_falloc_setsize(file, new_size); -- 2.50.0