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![Christoph Hellwig](/assets/img/avatar_default.png)
Add a mode where XFS never overwrites existing blocks in place. This is to aid debugging our COW code, and also put infatructure in place for things like possible future support for zoned block devices, which can't support overwrites. This mode is enabled globally by doing a: echo 1 > /sys/fs/xfs/debug/always_cow Note that the parameter is global to allow running all tests in xfstests easily in this mode, which would not easily be possible with a per-fs sysfs file. In always_cow mode persistent preallocations are disabled, and fallocate will fail when called with a 0 mode (with our without FALLOC_FL_KEEP_SIZE), and not create unwritten extent for zeroed space when called with FALLOC_FL_ZERO_RANGE or FALLOC_FL_UNSHARE_RANGE. There are a few interesting xfstests failures when run in always_cow mode: - generic/392 fails because the bytes used in the file used to test hole punch recovery are less after the log replay. This is because the blocks written and then punched out are only freed with a delay due to the logging mechanism. - xfs/170 will fail as the already fragile file streams mechanism doesn't seem to interact well with the COW allocator - xfs/180 xfs/182 xfs/192 xfs/198 xfs/204 and xfs/208 will claim the file system is badly fragmented, but there is not much we can do to avoid that when always writing out of place - xfs/205 fails because overwriting a file in always_cow mode will require new space allocation and the assumption in the test thus don't work anymore. - xfs/326 fails to modify the file at all in always_cow mode after injecting the refcount error, leading to an unexpected md5sum after the remount, but that again is expected Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
677 lines
13 KiB
C
677 lines
13 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2014 Red Hat, Inc.
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* All Rights Reserved.
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*/
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#include "xfs.h"
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#include "xfs_shared.h"
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#include "xfs_format.h"
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#include "xfs_log_format.h"
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#include "xfs_trans_resv.h"
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#include "xfs_sysfs.h"
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#include "xfs_log.h"
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#include "xfs_log_priv.h"
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#include "xfs_stats.h"
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#include "xfs_mount.h"
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struct xfs_sysfs_attr {
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struct attribute attr;
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ssize_t (*show)(struct kobject *kobject, char *buf);
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ssize_t (*store)(struct kobject *kobject, const char *buf,
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size_t count);
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};
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static inline struct xfs_sysfs_attr *
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to_attr(struct attribute *attr)
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{
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return container_of(attr, struct xfs_sysfs_attr, attr);
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}
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#define XFS_SYSFS_ATTR_RW(name) \
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static struct xfs_sysfs_attr xfs_sysfs_attr_##name = __ATTR_RW(name)
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#define XFS_SYSFS_ATTR_RO(name) \
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static struct xfs_sysfs_attr xfs_sysfs_attr_##name = __ATTR_RO(name)
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#define XFS_SYSFS_ATTR_WO(name) \
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static struct xfs_sysfs_attr xfs_sysfs_attr_##name = __ATTR_WO(name)
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#define ATTR_LIST(name) &xfs_sysfs_attr_##name.attr
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STATIC ssize_t
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xfs_sysfs_object_show(
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struct kobject *kobject,
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struct attribute *attr,
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char *buf)
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{
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struct xfs_sysfs_attr *xfs_attr = to_attr(attr);
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return xfs_attr->show ? xfs_attr->show(kobject, buf) : 0;
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}
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STATIC ssize_t
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xfs_sysfs_object_store(
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struct kobject *kobject,
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struct attribute *attr,
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const char *buf,
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size_t count)
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{
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struct xfs_sysfs_attr *xfs_attr = to_attr(attr);
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return xfs_attr->store ? xfs_attr->store(kobject, buf, count) : 0;
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}
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static const struct sysfs_ops xfs_sysfs_ops = {
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.show = xfs_sysfs_object_show,
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.store = xfs_sysfs_object_store,
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};
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/*
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* xfs_mount kobject. The mp kobject also serves as the per-mount parent object
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* that is identified by the fsname under sysfs.
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*/
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static inline struct xfs_mount *
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to_mp(struct kobject *kobject)
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{
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struct xfs_kobj *kobj = to_kobj(kobject);
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return container_of(kobj, struct xfs_mount, m_kobj);
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}
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static struct attribute *xfs_mp_attrs[] = {
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NULL,
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};
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struct kobj_type xfs_mp_ktype = {
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.release = xfs_sysfs_release,
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.sysfs_ops = &xfs_sysfs_ops,
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.default_attrs = xfs_mp_attrs,
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};
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#ifdef DEBUG
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/* debug */
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STATIC ssize_t
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bug_on_assert_store(
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struct kobject *kobject,
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const char *buf,
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size_t count)
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{
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int ret;
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int val;
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ret = kstrtoint(buf, 0, &val);
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if (ret)
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return ret;
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if (val == 1)
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xfs_globals.bug_on_assert = true;
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else if (val == 0)
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xfs_globals.bug_on_assert = false;
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else
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return -EINVAL;
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return count;
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}
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STATIC ssize_t
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bug_on_assert_show(
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struct kobject *kobject,
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char *buf)
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{
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return snprintf(buf, PAGE_SIZE, "%d\n", xfs_globals.bug_on_assert ? 1 : 0);
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}
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XFS_SYSFS_ATTR_RW(bug_on_assert);
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STATIC ssize_t
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log_recovery_delay_store(
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struct kobject *kobject,
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const char *buf,
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size_t count)
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{
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int ret;
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int val;
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ret = kstrtoint(buf, 0, &val);
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if (ret)
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return ret;
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if (val < 0 || val > 60)
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return -EINVAL;
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xfs_globals.log_recovery_delay = val;
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return count;
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}
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STATIC ssize_t
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log_recovery_delay_show(
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struct kobject *kobject,
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char *buf)
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{
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return snprintf(buf, PAGE_SIZE, "%d\n", xfs_globals.log_recovery_delay);
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}
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XFS_SYSFS_ATTR_RW(log_recovery_delay);
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STATIC ssize_t
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mount_delay_store(
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struct kobject *kobject,
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const char *buf,
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size_t count)
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{
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int ret;
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int val;
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ret = kstrtoint(buf, 0, &val);
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if (ret)
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return ret;
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if (val < 0 || val > 60)
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return -EINVAL;
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xfs_globals.mount_delay = val;
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return count;
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}
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STATIC ssize_t
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mount_delay_show(
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struct kobject *kobject,
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char *buf)
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{
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return snprintf(buf, PAGE_SIZE, "%d\n", xfs_globals.mount_delay);
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}
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XFS_SYSFS_ATTR_RW(mount_delay);
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static ssize_t
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always_cow_store(
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struct kobject *kobject,
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const char *buf,
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size_t count)
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{
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ssize_t ret;
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ret = kstrtobool(buf, &xfs_globals.always_cow);
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if (ret < 0)
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return ret;
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return count;
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}
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static ssize_t
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always_cow_show(
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struct kobject *kobject,
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char *buf)
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{
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return snprintf(buf, PAGE_SIZE, "%d\n", xfs_globals.always_cow);
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}
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XFS_SYSFS_ATTR_RW(always_cow);
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static struct attribute *xfs_dbg_attrs[] = {
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ATTR_LIST(bug_on_assert),
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ATTR_LIST(log_recovery_delay),
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ATTR_LIST(mount_delay),
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ATTR_LIST(always_cow),
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NULL,
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};
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struct kobj_type xfs_dbg_ktype = {
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.release = xfs_sysfs_release,
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.sysfs_ops = &xfs_sysfs_ops,
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.default_attrs = xfs_dbg_attrs,
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};
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#endif /* DEBUG */
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/* stats */
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static inline struct xstats *
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to_xstats(struct kobject *kobject)
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{
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struct xfs_kobj *kobj = to_kobj(kobject);
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return container_of(kobj, struct xstats, xs_kobj);
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}
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STATIC ssize_t
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stats_show(
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struct kobject *kobject,
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char *buf)
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{
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struct xstats *stats = to_xstats(kobject);
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return xfs_stats_format(stats->xs_stats, buf);
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}
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XFS_SYSFS_ATTR_RO(stats);
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STATIC ssize_t
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stats_clear_store(
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struct kobject *kobject,
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const char *buf,
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size_t count)
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{
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int ret;
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int val;
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struct xstats *stats = to_xstats(kobject);
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ret = kstrtoint(buf, 0, &val);
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if (ret)
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return ret;
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if (val != 1)
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return -EINVAL;
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xfs_stats_clearall(stats->xs_stats);
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return count;
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}
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XFS_SYSFS_ATTR_WO(stats_clear);
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static struct attribute *xfs_stats_attrs[] = {
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ATTR_LIST(stats),
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ATTR_LIST(stats_clear),
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NULL,
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};
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struct kobj_type xfs_stats_ktype = {
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.release = xfs_sysfs_release,
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.sysfs_ops = &xfs_sysfs_ops,
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.default_attrs = xfs_stats_attrs,
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};
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/* xlog */
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static inline struct xlog *
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to_xlog(struct kobject *kobject)
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{
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struct xfs_kobj *kobj = to_kobj(kobject);
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return container_of(kobj, struct xlog, l_kobj);
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}
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STATIC ssize_t
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log_head_lsn_show(
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struct kobject *kobject,
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char *buf)
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{
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int cycle;
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int block;
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struct xlog *log = to_xlog(kobject);
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spin_lock(&log->l_icloglock);
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cycle = log->l_curr_cycle;
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block = log->l_curr_block;
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spin_unlock(&log->l_icloglock);
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return snprintf(buf, PAGE_SIZE, "%d:%d\n", cycle, block);
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}
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XFS_SYSFS_ATTR_RO(log_head_lsn);
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STATIC ssize_t
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log_tail_lsn_show(
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struct kobject *kobject,
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char *buf)
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{
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int cycle;
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int block;
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struct xlog *log = to_xlog(kobject);
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xlog_crack_atomic_lsn(&log->l_tail_lsn, &cycle, &block);
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return snprintf(buf, PAGE_SIZE, "%d:%d\n", cycle, block);
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}
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XFS_SYSFS_ATTR_RO(log_tail_lsn);
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STATIC ssize_t
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reserve_grant_head_show(
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struct kobject *kobject,
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char *buf)
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{
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int cycle;
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int bytes;
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struct xlog *log = to_xlog(kobject);
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xlog_crack_grant_head(&log->l_reserve_head.grant, &cycle, &bytes);
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return snprintf(buf, PAGE_SIZE, "%d:%d\n", cycle, bytes);
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}
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XFS_SYSFS_ATTR_RO(reserve_grant_head);
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STATIC ssize_t
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write_grant_head_show(
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struct kobject *kobject,
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char *buf)
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{
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int cycle;
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int bytes;
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struct xlog *log = to_xlog(kobject);
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xlog_crack_grant_head(&log->l_write_head.grant, &cycle, &bytes);
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return snprintf(buf, PAGE_SIZE, "%d:%d\n", cycle, bytes);
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}
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XFS_SYSFS_ATTR_RO(write_grant_head);
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static struct attribute *xfs_log_attrs[] = {
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ATTR_LIST(log_head_lsn),
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ATTR_LIST(log_tail_lsn),
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ATTR_LIST(reserve_grant_head),
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ATTR_LIST(write_grant_head),
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NULL,
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};
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struct kobj_type xfs_log_ktype = {
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.release = xfs_sysfs_release,
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.sysfs_ops = &xfs_sysfs_ops,
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.default_attrs = xfs_log_attrs,
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};
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/*
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* Metadata IO error configuration
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*
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* The sysfs structure here is:
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* ...xfs/<dev>/error/<class>/<errno>/<error_attrs>
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*
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* where <class> allows us to discriminate between data IO and metadata IO,
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* and any other future type of IO (e.g. special inode or directory error
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* handling) we care to support.
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*/
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static inline struct xfs_error_cfg *
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to_error_cfg(struct kobject *kobject)
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{
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struct xfs_kobj *kobj = to_kobj(kobject);
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return container_of(kobj, struct xfs_error_cfg, kobj);
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}
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static inline struct xfs_mount *
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err_to_mp(struct kobject *kobject)
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{
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struct xfs_kobj *kobj = to_kobj(kobject);
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return container_of(kobj, struct xfs_mount, m_error_kobj);
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}
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static ssize_t
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max_retries_show(
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struct kobject *kobject,
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char *buf)
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{
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int retries;
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struct xfs_error_cfg *cfg = to_error_cfg(kobject);
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if (cfg->max_retries == XFS_ERR_RETRY_FOREVER)
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retries = -1;
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else
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retries = cfg->max_retries;
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return snprintf(buf, PAGE_SIZE, "%d\n", retries);
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}
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static ssize_t
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max_retries_store(
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struct kobject *kobject,
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const char *buf,
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size_t count)
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{
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struct xfs_error_cfg *cfg = to_error_cfg(kobject);
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int ret;
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int val;
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ret = kstrtoint(buf, 0, &val);
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if (ret)
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return ret;
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if (val < -1)
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return -EINVAL;
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if (val == -1)
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cfg->max_retries = XFS_ERR_RETRY_FOREVER;
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else
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cfg->max_retries = val;
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return count;
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}
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XFS_SYSFS_ATTR_RW(max_retries);
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static ssize_t
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retry_timeout_seconds_show(
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struct kobject *kobject,
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char *buf)
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{
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int timeout;
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struct xfs_error_cfg *cfg = to_error_cfg(kobject);
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if (cfg->retry_timeout == XFS_ERR_RETRY_FOREVER)
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timeout = -1;
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else
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timeout = jiffies_to_msecs(cfg->retry_timeout) / MSEC_PER_SEC;
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return snprintf(buf, PAGE_SIZE, "%d\n", timeout);
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}
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static ssize_t
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retry_timeout_seconds_store(
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struct kobject *kobject,
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const char *buf,
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size_t count)
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{
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struct xfs_error_cfg *cfg = to_error_cfg(kobject);
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int ret;
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int val;
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ret = kstrtoint(buf, 0, &val);
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if (ret)
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return ret;
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/* 1 day timeout maximum, -1 means infinite */
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if (val < -1 || val > 86400)
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return -EINVAL;
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if (val == -1)
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cfg->retry_timeout = XFS_ERR_RETRY_FOREVER;
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else {
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cfg->retry_timeout = msecs_to_jiffies(val * MSEC_PER_SEC);
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ASSERT(msecs_to_jiffies(val * MSEC_PER_SEC) < LONG_MAX);
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}
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return count;
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}
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XFS_SYSFS_ATTR_RW(retry_timeout_seconds);
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static ssize_t
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fail_at_unmount_show(
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struct kobject *kobject,
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char *buf)
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{
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struct xfs_mount *mp = err_to_mp(kobject);
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return snprintf(buf, PAGE_SIZE, "%d\n", mp->m_fail_unmount);
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}
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static ssize_t
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fail_at_unmount_store(
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struct kobject *kobject,
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const char *buf,
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size_t count)
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{
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struct xfs_mount *mp = err_to_mp(kobject);
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int ret;
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int val;
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ret = kstrtoint(buf, 0, &val);
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if (ret)
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return ret;
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if (val < 0 || val > 1)
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return -EINVAL;
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mp->m_fail_unmount = val;
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return count;
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}
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XFS_SYSFS_ATTR_RW(fail_at_unmount);
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static struct attribute *xfs_error_attrs[] = {
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ATTR_LIST(max_retries),
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ATTR_LIST(retry_timeout_seconds),
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NULL,
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};
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static struct kobj_type xfs_error_cfg_ktype = {
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.release = xfs_sysfs_release,
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.sysfs_ops = &xfs_sysfs_ops,
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.default_attrs = xfs_error_attrs,
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};
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static struct kobj_type xfs_error_ktype = {
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.release = xfs_sysfs_release,
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.sysfs_ops = &xfs_sysfs_ops,
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};
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/*
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* Error initialization tables. These need to be ordered in the same
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* order as the enums used to index the array. All class init tables need to
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* define a "default" behaviour as the first entry, all other entries can be
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|
* empty.
|
|
*/
|
|
struct xfs_error_init {
|
|
char *name;
|
|
int max_retries;
|
|
int retry_timeout; /* in seconds */
|
|
};
|
|
|
|
static const struct xfs_error_init xfs_error_meta_init[XFS_ERR_ERRNO_MAX] = {
|
|
{ .name = "default",
|
|
.max_retries = XFS_ERR_RETRY_FOREVER,
|
|
.retry_timeout = XFS_ERR_RETRY_FOREVER,
|
|
},
|
|
{ .name = "EIO",
|
|
.max_retries = XFS_ERR_RETRY_FOREVER,
|
|
.retry_timeout = XFS_ERR_RETRY_FOREVER,
|
|
},
|
|
{ .name = "ENOSPC",
|
|
.max_retries = XFS_ERR_RETRY_FOREVER,
|
|
.retry_timeout = XFS_ERR_RETRY_FOREVER,
|
|
},
|
|
{ .name = "ENODEV",
|
|
.max_retries = 0, /* We can't recover from devices disappearing */
|
|
.retry_timeout = 0,
|
|
},
|
|
};
|
|
|
|
static int
|
|
xfs_error_sysfs_init_class(
|
|
struct xfs_mount *mp,
|
|
int class,
|
|
const char *parent_name,
|
|
struct xfs_kobj *parent_kobj,
|
|
const struct xfs_error_init init[])
|
|
{
|
|
struct xfs_error_cfg *cfg;
|
|
int error;
|
|
int i;
|
|
|
|
ASSERT(class < XFS_ERR_CLASS_MAX);
|
|
|
|
error = xfs_sysfs_init(parent_kobj, &xfs_error_ktype,
|
|
&mp->m_error_kobj, parent_name);
|
|
if (error)
|
|
return error;
|
|
|
|
for (i = 0; i < XFS_ERR_ERRNO_MAX; i++) {
|
|
cfg = &mp->m_error_cfg[class][i];
|
|
error = xfs_sysfs_init(&cfg->kobj, &xfs_error_cfg_ktype,
|
|
parent_kobj, init[i].name);
|
|
if (error)
|
|
goto out_error;
|
|
|
|
cfg->max_retries = init[i].max_retries;
|
|
if (init[i].retry_timeout == XFS_ERR_RETRY_FOREVER)
|
|
cfg->retry_timeout = XFS_ERR_RETRY_FOREVER;
|
|
else
|
|
cfg->retry_timeout = msecs_to_jiffies(
|
|
init[i].retry_timeout * MSEC_PER_SEC);
|
|
}
|
|
return 0;
|
|
|
|
out_error:
|
|
/* unwind the entries that succeeded */
|
|
for (i--; i >= 0; i--) {
|
|
cfg = &mp->m_error_cfg[class][i];
|
|
xfs_sysfs_del(&cfg->kobj);
|
|
}
|
|
xfs_sysfs_del(parent_kobj);
|
|
return error;
|
|
}
|
|
|
|
int
|
|
xfs_error_sysfs_init(
|
|
struct xfs_mount *mp)
|
|
{
|
|
int error;
|
|
|
|
/* .../xfs/<dev>/error/ */
|
|
error = xfs_sysfs_init(&mp->m_error_kobj, &xfs_error_ktype,
|
|
&mp->m_kobj, "error");
|
|
if (error)
|
|
return error;
|
|
|
|
error = sysfs_create_file(&mp->m_error_kobj.kobject,
|
|
ATTR_LIST(fail_at_unmount));
|
|
|
|
if (error)
|
|
goto out_error;
|
|
|
|
/* .../xfs/<dev>/error/metadata/ */
|
|
error = xfs_error_sysfs_init_class(mp, XFS_ERR_METADATA,
|
|
"metadata", &mp->m_error_meta_kobj,
|
|
xfs_error_meta_init);
|
|
if (error)
|
|
goto out_error;
|
|
|
|
return 0;
|
|
|
|
out_error:
|
|
xfs_sysfs_del(&mp->m_error_kobj);
|
|
return error;
|
|
}
|
|
|
|
void
|
|
xfs_error_sysfs_del(
|
|
struct xfs_mount *mp)
|
|
{
|
|
struct xfs_error_cfg *cfg;
|
|
int i, j;
|
|
|
|
for (i = 0; i < XFS_ERR_CLASS_MAX; i++) {
|
|
for (j = 0; j < XFS_ERR_ERRNO_MAX; j++) {
|
|
cfg = &mp->m_error_cfg[i][j];
|
|
|
|
xfs_sysfs_del(&cfg->kobj);
|
|
}
|
|
}
|
|
xfs_sysfs_del(&mp->m_error_meta_kobj);
|
|
xfs_sysfs_del(&mp->m_error_kobj);
|
|
}
|
|
|
|
struct xfs_error_cfg *
|
|
xfs_error_get_cfg(
|
|
struct xfs_mount *mp,
|
|
int error_class,
|
|
int error)
|
|
{
|
|
struct xfs_error_cfg *cfg;
|
|
|
|
if (error < 0)
|
|
error = -error;
|
|
|
|
switch (error) {
|
|
case EIO:
|
|
cfg = &mp->m_error_cfg[error_class][XFS_ERR_EIO];
|
|
break;
|
|
case ENOSPC:
|
|
cfg = &mp->m_error_cfg[error_class][XFS_ERR_ENOSPC];
|
|
break;
|
|
case ENODEV:
|
|
cfg = &mp->m_error_cfg[error_class][XFS_ERR_ENODEV];
|
|
break;
|
|
default:
|
|
cfg = &mp->m_error_cfg[error_class][XFS_ERR_DEFAULT];
|
|
break;
|
|
}
|
|
|
|
return cfg;
|
|
}
|