@@ -65,6 +65,18 @@ struct dax_device *fs_dax_get_by_bdev(struct block_device *bdev)
return dax_get_by_host(bdev->bd_disk->disk_name);
}
EXPORT_SYMBOL_GPL(fs_dax_get_by_bdev);
+
+void fs_dax_set_holder(struct dax_device *dax_dev, void *holder,
+ const struct dax_holder_operations *ops)
+{
+ dax_set_holder(dax_dev, holder, ops);
+}
+EXPORT_SYMBOL_GPL(fs_dax_set_holder);
+void *fs_dax_get_holder(struct dax_device *dax_dev)
+{
+ return dax_get_holder(dax_dev);
+}
+EXPORT_SYMBOL_GPL(fs_dax_get_holder);
#endif
bool __generic_fsdax_supported(struct dax_device *dax_dev,
@@ -549,6 +549,11 @@ xfs_do_force_shutdown(
flags, __return_address, fname, lnnum);
if (XFS_ERRLEVEL_HIGH <= xfs_error_level)
xfs_stack_trace();
+ } else if (flags & SHUTDOWN_CORRUPT_META) {
+ xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_CORRUPT,
+"Corruption of on-disk metadata detected. Shutting down filesystem");
+ if (XFS_ERRLEVEL_HIGH <= xfs_error_level)
+ xfs_stack_trace();
} else if (logerror) {
xfs_alert_tag(mp, XFS_PTAG_SHUTDOWN_LOGERROR,
"Log I/O error (0x%x) detected at %pS (%s:%d). Shutting down filesystem",
@@ -277,6 +277,7 @@ void xfs_do_force_shutdown(struct xfs_mount *mp, int flags, char *fname,
#define SHUTDOWN_LOG_IO_ERROR 0x0002 /* write attempt to the log failed */
#define SHUTDOWN_FORCE_UMOUNT 0x0004 /* shutdown from a forced unmount */
#define SHUTDOWN_CORRUPT_INCORE 0x0008 /* corrupt in-memory data structures */
+#define SHUTDOWN_CORRUPT_META 0x0010 /* corrupt metadata on device */
/*
* Flags for xfs_mountfs
@@ -37,11 +37,19 @@
#include "xfs_reflink.h"
#include "xfs_pwork.h"
#include "xfs_ag.h"
+#include "xfs_alloc.h"
+#include "xfs_rmap.h"
+#include "xfs_rmap_btree.h"
+#include "xfs_rtalloc.h"
+#include "xfs_bit.h"
#include <linux/magic.h>
#include <linux/fs_context.h>
#include <linux/fs_parser.h>
+#include <linux/mm.h>
+#include <linux/dax.h>
+static const struct dax_holder_operations xfs_dax_holder_operations;
static const struct super_operations xfs_super_operations;
static struct kset *xfs_kset; /* top-level xfs sysfs dir */
@@ -352,6 +360,7 @@ xfs_close_devices(
xfs_free_buftarg(mp->m_logdev_targp);
xfs_blkdev_put(logdev);
+ fs_dax_set_holder(dax_logdev, NULL, NULL);
fs_put_dax(dax_logdev);
}
if (mp->m_rtdev_targp) {
@@ -360,9 +369,11 @@ xfs_close_devices(
xfs_free_buftarg(mp->m_rtdev_targp);
xfs_blkdev_put(rtdev);
+ fs_dax_set_holder(dax_rtdev, NULL, NULL);
fs_put_dax(dax_rtdev);
}
xfs_free_buftarg(mp->m_ddev_targp);
+ fs_dax_set_holder(dax_ddev, NULL, NULL);
fs_put_dax(dax_ddev);
}
@@ -386,6 +397,7 @@ xfs_open_devices(
struct block_device *logdev = NULL, *rtdev = NULL;
int error;
+ fs_dax_set_holder(dax_ddev, mp, &xfs_dax_holder_operations);
/*
* Open real time and log devices - order is important.
*/
@@ -394,6 +406,9 @@ xfs_open_devices(
if (error)
goto out;
dax_logdev = fs_dax_get_by_bdev(logdev);
+ if (dax_logdev != dax_ddev)
+ fs_dax_set_holder(dax_logdev, mp,
+ &xfs_dax_holder_operations);
}
if (mp->m_rtname) {
@@ -408,6 +423,7 @@ xfs_open_devices(
goto out_close_rtdev;
}
dax_rtdev = fs_dax_get_by_bdev(rtdev);
+ fs_dax_set_holder(dax_rtdev, mp, &xfs_dax_holder_operations);
}
/*
@@ -1070,6 +1086,125 @@ xfs_fs_free_cached_objects(
return xfs_reclaim_inodes_nr(XFS_M(sb), sc->nr_to_scan);
}
+static int
+xfs_corrupt_helper(
+ struct xfs_btree_cur *cur,
+ struct xfs_rmap_irec *rec,
+ void *data)
+{
+ struct xfs_inode *ip;
+ struct address_space *mapping;
+ int error = 0, *flags = data, i;
+
+ if (XFS_RMAP_NON_INODE_OWNER(rec->rm_owner) ||
+ (rec->rm_flags & (XFS_RMAP_ATTR_FORK | XFS_RMAP_BMBT_BLOCK))) {
+ // TODO check and try to fix metadata
+ xfs_force_shutdown(cur->bc_mp, SHUTDOWN_CORRUPT_META);
+ return -EFSCORRUPTED;
+ }
+
+ /* Get files that incore, filter out others that are not in use. */
+ error = xfs_iget(cur->bc_mp, cur->bc_tp, rec->rm_owner, XFS_IGET_INCORE,
+ 0, &ip);
+ if (error)
+ return error;
+
+ mapping = VFS_I(ip)->i_mapping;
+ if (IS_ENABLED(CONFIG_MEMORY_FAILURE)) {
+ for (i = 0; i < rec->rm_blockcount; i++) {
+ error = mf_dax_kill_procs(mapping, rec->rm_offset + i,
+ *flags);
+ if (error)
+ break;
+ }
+ }
+ // TODO try to fix data
+ xfs_irele(ip);
+
+ return error;
+}
+
+static loff_t
+xfs_dax_bdev_offset(
+ struct xfs_mount *mp,
+ struct dax_device *dax_dev,
+ loff_t disk_offset)
+{
+ struct block_device *bdev;
+
+ if (mp->m_ddev_targp->bt_daxdev == dax_dev)
+ bdev = mp->m_ddev_targp->bt_bdev;
+ else if (mp->m_logdev_targp->bt_daxdev == dax_dev)
+ bdev = mp->m_logdev_targp->bt_bdev;
+ else
+ bdev = mp->m_rtdev_targp->bt_bdev;
+
+ return disk_offset - (get_start_sect(bdev) << SECTOR_SHIFT);
+}
+
+static int
+xfs_dax_notify_failure(
+ struct dax_device *dax_dev,
+ loff_t offset,
+ size_t len,
+ void *data)
+{
+ struct xfs_mount *mp = fs_dax_get_holder(dax_dev);
+ struct xfs_trans *tp = NULL;
+ struct xfs_btree_cur *cur = NULL;
+ struct xfs_buf *agf_bp = NULL;
+ struct xfs_rmap_irec rmap_low, rmap_high;
+ loff_t bdev_offset = xfs_dax_bdev_offset(mp, dax_dev,
+ offset);
+ xfs_fsblock_t fsbno = XFS_B_TO_FSB(mp, bdev_offset);
+ xfs_filblks_t bcnt = XFS_B_TO_FSB(mp, len);
+ xfs_agnumber_t agno = XFS_FSB_TO_AGNO(mp, fsbno);
+ xfs_agblock_t agbno = XFS_FSB_TO_AGBNO(mp, fsbno);
+ int error = 0;
+
+ if (mp->m_logdev_targp && mp->m_logdev_targp->bt_daxdev == dax_dev &&
+ mp->m_logdev_targp != mp->m_ddev_targp) {
+ xfs_err(mp, "ondisk log corrupt, shutting down fs!");
+ xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_META);
+ return -EFSCORRUPTED;
+ }
+
+ if (!xfs_sb_version_hasrmapbt(&mp->m_sb)) {
+ xfs_warn(mp, "notify_failure() needs rmapbt enabled!");
+ return -EOPNOTSUPP;
+ }
+
+ error = xfs_trans_alloc_empty(mp, &tp);
+ if (error)
+ return error;
+
+ error = xfs_alloc_read_agf(mp, tp, agno, 0, &agf_bp);
+ if (error)
+ goto out_cancel_tp;
+
+ cur = xfs_rmapbt_init_cursor(mp, tp, agf_bp, agf_bp->b_pag);
+
+ /* Construct a range for rmap query */
+ memset(&rmap_low, 0, sizeof(rmap_low));
+ memset(&rmap_high, 0xFF, sizeof(rmap_high));
+ rmap_low.rm_startblock = rmap_high.rm_startblock = agbno;
+ rmap_low.rm_blockcount = rmap_high.rm_blockcount = bcnt;
+
+ error = xfs_rmap_query_range(cur, &rmap_low, &rmap_high,
+ xfs_corrupt_helper, data);
+
+ xfs_btree_del_cursor(cur, error);
+ xfs_trans_brelse(tp, agf_bp);
+
+out_cancel_tp:
+ xfs_trans_cancel(tp);
+ return error;
+}
+
+static const struct dax_holder_operations xfs_dax_holder_operations = {
+ .notify_failure = xfs_dax_notify_failure,
+};
+
static const struct super_operations xfs_super_operations = {
.alloc_inode = xfs_fs_alloc_inode,
.destroy_inode = xfs_fs_destroy_inode,
@@ -160,6 +160,9 @@ static inline void fs_put_dax(struct dax_device *dax_dev)
}
struct dax_device *fs_dax_get_by_bdev(struct block_device *bdev);
+void fs_dax_set_holder(struct dax_device *dax_dev, void *holder,
+ const struct dax_holder_operations *ops);
+void *fs_dax_get_holder(struct dax_device *dax_dev);
int dax_writeback_mapping_range(struct address_space *mapping,
struct dax_device *dax_dev, struct writeback_control *wbc);
@@ -191,6 +194,16 @@ static inline struct dax_device *fs_dax_get_by_bdev(struct block_device *bdev)
return NULL;
}
+static inline void fs_dax_set_holder(struct dax_device *dax_dev, void *holder,
+ const struct dax_holder_operations *ops)
+{
+}
+
+static inline void *fs_dax_get_holder(struct dax_device *dax_dev)
+{
+ return NULL;
+}
+
static inline struct page *dax_layout_busy_page(struct address_space *mapping)
{
return NULL;
This function is used to handle errors which may cause data lost in filesystem. Such as memory failure in fsdax mode. If the rmap feature of XFS enabled, we can query it to find files and metadata which are associated with the corrupt data. For now all we do is kill processes with that file mapped into their address spaces, but future patches could actually do something about corrupt metadata. After that, the memory failure needs to notify the processes who are using those files. Signed-off-by: Shiyang Ruan <ruansy.fnst@fujitsu.com> --- drivers/dax/super.c | 12 ++++ fs/xfs/xfs_fsops.c | 5 ++ fs/xfs/xfs_mount.h | 1 + fs/xfs/xfs_super.c | 135 ++++++++++++++++++++++++++++++++++++++++++++ include/linux/dax.h | 13 +++++ 5 files changed, 166 insertions(+)