Drop patch that was NAKed upstream (rhbz 783211)
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Josh Boyer
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Path: news.gmane.org!not-for-mail
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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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11
kernel.spec
11
kernel.spec
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@ -54,7 +54,7 @@ Summary: The Linux kernel
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# For non-released -rc kernels, this will be appended after the rcX and
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# gitX tags, so a 3 here would become part of release "0.rcX.gitX.3"
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#
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%global baserelease 1
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%global baserelease 2
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%global fedora_build %{baserelease}
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# base_sublevel is the kernel version we're starting with and patching
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@ -737,9 +737,6 @@ Patch21070: ext4-Support-check-none-nocheck-mount-options.patch
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Patch21073: KVM-x86-extend-struct-x86_emulate_ops-with-get_cpuid.patch
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Patch21074: KVM-x86-fix-missing-checks-in-syscall-emulation.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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Patch21091: kmemleak.patch
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Patch21092: udlfb-remove-sysfs-framebuffer-device-with-USB-disconnect.patch
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@ -1439,9 +1436,6 @@ ApplyPatch kmemleak.patch
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ApplyPatch udlfb-remove-sysfs-framebuffer-device-with-USB-disconnect.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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#rhbz 772772
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ApplyPatch rt2x00_fix_MCU_request_failures.patch
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@ -2292,6 +2286,9 @@ fi
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# ||----w |
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# || ||
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%changelog
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* Fri Feb 03 2012 Josh Boyer <jwboyer@redhat.com> - 3.3.0-0.rc2.git3.2
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- Drop patch that was NAKed upstream (rhbz 783211)
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* Fri Feb 03 2012 Josh Boyer <jwboyer@redhat.com> - 3.3.0-0.rc2.git3.1
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- Linux 3.3-rc2-git3 (upstream 7f06db34e55af8fc33cf3d6d46d869cb7a372b5d)
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- Patch from Jakub Kicinski to fix rt2x00 MCU requests (rhbz 772772)
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