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Diffstat (limited to 'fs')
-rw-r--r--fs/xfs/xfs_aops.c9
-rw-r--r--fs/xfs/xfs_mount.h25
-rw-r--r--fs/xfs/xfs_sysfs.c78
3 files changed, 101 insertions, 11 deletions
diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c
index 379c089fb051..eed0bfc4443c 100644
--- a/fs/xfs/xfs_aops.c
+++ b/fs/xfs/xfs_aops.c
@@ -1752,6 +1752,7 @@ xfs_vm_write_failed(
loff_t from = pos & (PAGE_CACHE_SIZE - 1);
loff_t to = from + len;
struct buffer_head *bh, *head;
+ struct xfs_mount *mp = XFS_I(inode)->i_mount;
/*
* The request pos offset might be 32 or 64 bit, this is all fine
@@ -1786,7 +1787,8 @@ xfs_vm_write_failed(
if (!buffer_delay(bh))
continue;
- if (!buffer_new(bh) && block_offset < i_size_read(inode))
+ if (!xfs_mp_fail_writes(mp) && !buffer_new(bh) &&
+ block_offset < i_size_read(inode))
continue;
xfs_vm_kill_delalloc_range(inode, block_offset,
@@ -1824,6 +1826,7 @@ xfs_vm_write_begin(
pgoff_t index = pos >> PAGE_CACHE_SHIFT;
struct page *page;
int status;
+ struct xfs_mount *mp = XFS_I(mapping->host)->i_mount;
ASSERT(len <= PAGE_CACHE_SIZE);
@@ -1832,6 +1835,8 @@ xfs_vm_write_begin(
return -ENOMEM;
status = __block_write_begin(page, pos, len, xfs_get_blocks);
+ if (xfs_mp_fail_writes(mp))
+ status = -EIO;
if (unlikely(status)) {
struct inode *inode = mapping->host;
size_t isize = i_size_read(inode);
@@ -1844,6 +1849,8 @@ xfs_vm_write_begin(
* allocated in this write, not blocks that were previously
* written successfully.
*/
+ if (xfs_mp_fail_writes(mp))
+ isize = 0;
if (pos + len > isize) {
ssize_t start = max_t(ssize_t, pos, isize);
diff --git a/fs/xfs/xfs_mount.h b/fs/xfs/xfs_mount.h
index b57098481c10..546cf46a97ce 100644
--- a/fs/xfs/xfs_mount.h
+++ b/fs/xfs/xfs_mount.h
@@ -147,6 +147,17 @@ typedef struct xfs_mount {
* to various other kinds of pain inflicted on the pNFS server.
*/
__uint32_t m_generation;
+
+#ifdef DEBUG
+ /*
+ * DEBUG mode instrumentation to test and/or trigger delayed allocation
+ * block killing in the event of failed writes. When enabled, all
+ * buffered writes are forced to fail. All delalloc blocks in the range
+ * of the write (including pre-existing delalloc blocks!) are tossed as
+ * part of the write failure error handling sequence.
+ */
+ bool m_fail_writes;
+#endif
} xfs_mount_t;
/*
@@ -264,6 +275,20 @@ xfs_daddr_to_agbno(struct xfs_mount *mp, xfs_daddr_t d)
return (xfs_agblock_t) do_div(ld, mp->m_sb.sb_agblocks);
}
+#ifdef DEBUG
+static inline bool
+xfs_mp_fail_writes(struct xfs_mount *mp)
+{
+ return mp->m_fail_writes;
+}
+#else
+static inline bool
+xfs_mp_fail_writes(struct xfs_mount *mp)
+{
+ return 0;
+}
+#endif
+
/*
* Per-ag incore structure, copies of information in agf and agi, to improve the
* performance of allocation group selection.
diff --git a/fs/xfs/xfs_sysfs.c b/fs/xfs/xfs_sysfs.c
index 641d625eb334..6ced4f143494 100644
--- a/fs/xfs/xfs_sysfs.c
+++ b/fs/xfs/xfs_sysfs.c
@@ -18,10 +18,13 @@
#include "xfs.h"
#include "xfs_sysfs.h"
+#include "xfs_format.h"
#include "xfs_log_format.h"
+#include "xfs_trans_resv.h"
#include "xfs_log.h"
#include "xfs_log_priv.h"
#include "xfs_stats.h"
+#include "xfs_mount.h"
struct xfs_sysfs_attr {
struct attribute attr;
@@ -45,16 +48,6 @@ to_attr(struct attribute *attr)
#define ATTR_LIST(name) &xfs_sysfs_attr_##name.attr
-/*
- * xfs_mount kobject. This currently has no attributes and thus no need for show
- * and store helpers. The mp kobject serves as the per-mount parent object that
- * is identified by the fsname under sysfs.
- */
-
-struct kobj_type xfs_mp_ktype = {
- .release = xfs_sysfs_release,
-};
-
STATIC ssize_t
xfs_sysfs_object_show(
struct kobject *kobject,
@@ -83,6 +76,71 @@ static const struct sysfs_ops xfs_sysfs_ops = {
.store = xfs_sysfs_object_store,
};
+/*
+ * xfs_mount kobject. The mp kobject also serves as the per-mount parent object
+ * that is identified by the fsname under sysfs.
+ */
+
+static inline struct xfs_mount *
+to_mp(struct kobject *kobject)
+{
+ struct xfs_kobj *kobj = to_kobj(kobject);
+
+ return container_of(kobj, struct xfs_mount, m_kobj);
+}
+
+#ifdef DEBUG
+
+STATIC ssize_t
+fail_writes_store(
+ struct kobject *kobject,
+ const char *buf,
+ size_t count)
+{
+ struct xfs_mount *mp = to_mp(kobject);
+ int ret;
+ int val;
+
+ ret = kstrtoint(buf, 0, &val);
+ if (ret)
+ return ret;
+
+ if (val == 1)
+ mp->m_fail_writes = true;
+ else if (val == 0)
+ mp->m_fail_writes = false;
+ else
+ return -EINVAL;
+
+ return count;
+}
+
+STATIC ssize_t
+fail_writes_show(
+ struct kobject *kobject,
+ char *buf)
+{
+ struct xfs_mount *mp = to_mp(kobject);
+
+ return snprintf(buf, PAGE_SIZE, "%d\n", mp->m_fail_writes ? 1 : 0);
+}
+XFS_SYSFS_ATTR_RW(fail_writes);
+
+#endif /* DEBUG */
+
+static struct attribute *xfs_mp_attrs[] = {
+#ifdef DEBUG
+ ATTR_LIST(fail_writes),
+#endif
+ NULL,
+};
+
+struct kobj_type xfs_mp_ktype = {
+ .release = xfs_sysfs_release,
+ .sysfs_ops = &xfs_sysfs_ops,
+ .default_attrs = xfs_mp_attrs,
+};
+
#ifdef DEBUG
/* debug */