Add patch to invalidate parent cache when fsync is called on a partition
(rhbz 783211)
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Josh Boyer
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From: Niels de Vos <ndevos@redhat.com>
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Newsgroups: gmane.linux.kernel,gmane.linux.file-systems
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Subject: [PATCH v2] fs: Invalidate the cache for a parent block-device if fsync() is called for a partition
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Date: Mon, 23 Jan 2012 10:38:29 +0000
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Cc: linux-kernel@vger.kernel.org, Niels de Vos <ndevos@redhat.com>,
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"Bryn M. Reeves" <bmr@redhat.com>,
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Mikulas Patocka <mpatocka@redhat.com>
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Executing an fsync() on a file-descriptor of a partition flushes the
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caches for that partition by calling blkdev_issue_flush(). However, it
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seems that reading data through the parent device will still return the
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old cached data.
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The cache for the block-device is not synced if the block-device is kept
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open (due to a mounted partition, for example). Only when all users for
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the disk have exited, the cache for the disk is made consistent again.
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Calling invalidate_bdev() on the parent block-device in case
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blkdev_fsync() was called for a partition, fixes this.
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The problem can be worked around by forcing the caches to be flushed
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with either
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# blockdev --flushbufs ${dev_disk}
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or
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# echo 3 > /proc/sys/vm/drop_caches
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CC: Bryn M. Reeves <bmr@redhat.com>
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CC: Mikulas Patocka <mpatocka@redhat.com>
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Signed-off-by: Niels de Vos <ndevos@redhat.com>
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---
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v2:
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- Do not call invalidate_bdev() from blkdev_issue_flush() and prevent
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performance degration with journalled filesystems.
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Suggested was to call invalidate_bdev() in fsync_bdev(), but this is
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not in the call-path of mkfs.ext3 and similar tools. Hence the issue
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persists.
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- Correct phrasing a little, changing ioctl-BLKFLSBUF is not required.
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- This issue also occurs when doing an ioctl-BLKFLSBUF on a partition.
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Reading the whole disk will still return cached data. If this is an
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issue, it will need a seperate patch.
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---
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fs/block_dev.c | 4 ++++
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1 files changed, 4 insertions(+), 0 deletions(-)
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diff --git a/fs/block_dev.c b/fs/block_dev.c
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index 0e575d1..433c4de 100644
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--- a/fs/block_dev.c
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+++ b/fs/block_dev.c
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@@ -424,6 +424,10 @@ int blkdev_fsync(struct file *filp, loff_t start, loff_t end, int datasync)
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if (error == -EOPNOTSUPP)
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error = 0;
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+ /* invalidate parent block_device */
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+ if (!error && bdev != bdev->bd_contains)
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+ invalidate_bdev(bdev->bd_contains);
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+
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return error;
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}
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EXPORT_SYMBOL(blkdev_fsync);
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--
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1.7.6.5
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12
kernel.spec
12
kernel.spec
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@ -797,6 +797,9 @@ Patch21084: proc-fix-null-pointer-deref-in-proc_pid_permission.patch
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#rhbz 782681
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Patch21085: proc-clean-up-and-fix-proc-pid-mem-handling.patch
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#rhbz 783211
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Patch21087: fs-Inval-cache-for-parent-block-device-if-fsync-called-on-part.patch
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#rhbz 771058
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Patch22100: msi-irq-sysfs-warning.patch
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@ -823,7 +826,6 @@ Patch21230: rds-Make-rds_sock_lock-BH-rather-than-IRQ-safe.patch
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Patch22000: rcu-reintroduce-missing-calls.patch
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# compat-wireless patches
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Patch50000: compat-wireless-config-fixups.patch
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Patch50001: compat-wireless-pr_fmt-warning-avoidance.patch
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@ -834,6 +836,7 @@ Patch50100: compat-wireless-rtl8192cu-Fix-WARNING-on-suspend-resume.patch
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# Remove overlapping hardware support between b43 and brcmsmac
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Patch50101: b43-add-option-to-avoid-duplicating-device-support-w.patch
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%endif
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BuildRoot: %{_tmppath}/kernel-%{KVERREL}-root
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@ -1535,6 +1538,9 @@ ApplyPatch rcu-reintroduce-missing-calls.patch
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#rhbz 718790
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ApplyPatch rds-Make-rds_sock_lock-BH-rather-than-IRQ-safe.patch
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#rhbz 783211
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ApplyPatch fs-Inval-cache-for-parent-block-device-if-fsync-called-on-part.patch
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# END OF PATCH APPLICATIONS
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%endif
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@ -2306,6 +2312,10 @@ fi
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# and build.
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%changelog
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* Wed Jan 25 2012 Josh Boyer <jwboyer@redhat.com>
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- Add patch to invalidate parent cache when fsync is called on a partition
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(rhbz 783211)
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* Wed Jan 25 2012 John W. Linville <linville@redhat.com>
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- modpost: add option to allow external modules to avoid taint
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- Make integrated compat-wireless take advantage of the above
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