From e6b3bb78962e65c4ad125598755cfbf2a8779e86 Mon Sep 17 00:00:00 2001 From: Carlos Maiolino Date: Wed, 18 May 2016 11:11:27 +1000 Subject: xfs: add "fail at unmount" error handling configuration If we take "retry forever" literally on metadata IO errors, we can hang at unmount, once it retries those writes forever. This is the default behavior, unfortunately. Add an error configuration option for this behavior and default it to "fail" so that an unmount will trigger actuall errors, a shutdown and allow the unmount to succeed. It will be noisy, though, as it will log the errors and shutdown that occurs. To fix this, we need to mark the filesystem as being in the process of unmounting. Do this with a mount flag that is added at the appropriate time (i.e. before the blocking AIL sync). We also need to add this flag if mount fails after the initial phase of log recovery has been run. Signed-off-by: Dave Chinner Signed-off-by: Carlos Maiolino Reviewed-by: Brian Foster Signed-off-by: Dave Chinner --- fs/xfs/xfs_sysfs.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) (limited to 'fs/xfs/xfs_sysfs.c') diff --git a/fs/xfs/xfs_sysfs.c b/fs/xfs/xfs_sysfs.c index 084a606840a1..4c2c55086208 100644 --- a/fs/xfs/xfs_sysfs.c +++ b/fs/xfs/xfs_sysfs.c @@ -381,6 +381,13 @@ to_error_cfg(struct kobject *kobject) return container_of(kobj, struct xfs_error_cfg, kobj); } +static inline struct xfs_mount * +err_to_mp(struct kobject *kobject) +{ + struct xfs_kobj *kobj = to_kobj(kobject); + return container_of(kobj, struct xfs_mount, m_error_kobj); +} + static ssize_t max_retries_show( struct kobject *kobject, @@ -447,6 +454,38 @@ retry_timeout_seconds_store( } XFS_SYSFS_ATTR_RW(retry_timeout_seconds); +static ssize_t +fail_at_unmount_show( + struct kobject *kobject, + char *buf) +{ + struct xfs_mount *mp = err_to_mp(kobject); + + return snprintf(buf, PAGE_SIZE, "%d\n", mp->m_fail_unmount); +} + +static ssize_t +fail_at_unmount_store( + struct kobject *kobject, + const char *buf, + size_t count) +{ + struct xfs_mount *mp = err_to_mp(kobject); + int ret; + int val; + + ret = kstrtoint(buf, 0, &val); + if (ret) + return ret; + + if (val < 0 || val > 1) + return -EINVAL; + + mp->m_fail_unmount = val; + return count; +} +XFS_SYSFS_ATTR_RW(fail_at_unmount); + static struct attribute *xfs_error_attrs[] = { ATTR_LIST(max_retries), ATTR_LIST(retry_timeout_seconds), @@ -462,6 +501,7 @@ struct kobj_type xfs_error_cfg_ktype = { struct kobj_type xfs_error_ktype = { .release = xfs_sysfs_release, + .sysfs_ops = &xfs_sysfs_ops, }; /* @@ -548,6 +588,12 @@ xfs_error_sysfs_init( if (error) return error; + error = sysfs_create_file(&mp->m_error_kobj.kobject, + ATTR_LIST(fail_at_unmount)); + + if (error) + goto out_error; + /* .../xfs//error/metadata/ */ error = xfs_error_sysfs_init_class(mp, XFS_ERR_METADATA, "metadata", &mp->m_error_meta_kobj, -- cgit v1.2.3