@@ -35,6 +35,11 @@
#include "xfs_refcount_item.h"
#include "xfs_bmap_item.h"
#include "xfs_reflink.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>
@@ -1103,6 +1108,87 @@ xfs_fs_free_cached_objects(
return xfs_reclaim_inodes_nr(XFS_M(sb), sc->nr_to_scan);
}
+static int
+xfs_storage_lost_helper(
+ struct xfs_btree_cur *cur,
+ struct xfs_rmap_irec *rec,
+ void *priv)
+{
+ struct xfs_inode *ip;
+ struct mf_recover_controller *mfrc = priv;
+ int rc = 0;
+
+ if (XFS_RMAP_NON_INODE_OWNER(rec->rm_owner)) {
+ // TODO check and try to fix metadata
+ } else {
+ /*
+ * Get files that incore, filter out others that are not in use.
+ */
+ rc = xfs_iget(cur->bc_mp, cur->bc_tp, rec->rm_owner,
+ XFS_IGET_INCORE, 0, &ip);
+ if (rc || !ip)
+ return rc;
+ if (!VFS_I(ip)->i_mapping)
+ goto out;
+
+ rc = mfrc->recover_fn(mfrc->pfn, mfrc->flags,
+ VFS_I(ip)->i_mapping, rec->rm_offset);
+
+ // TODO try to fix data
+out:
+ xfs_irele(ip);
+ }
+
+ return rc;
+}
+
+static int
+xfs_fs_storage_lost(
+ struct super_block *sb,
+ struct block_device *bdev,
+ loff_t offset,
+ void *priv)
+{
+ struct xfs_mount *mp = XFS_M(sb);
+ struct xfs_trans *tp = NULL;
+ struct xfs_btree_cur *cur = NULL;
+ struct xfs_rmap_irec rmap_low, rmap_high;
+ struct xfs_buf *agf_bp = NULL;
+ xfs_fsblock_t fsbno = XFS_B_TO_FSB(mp, offset);
+ 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_rtdev_targp && mp->m_rtdev_targp->bt_bdev == bdev) {
+ xfs_warn(mp, "storage lost support not available for realtime device!");
+ return 0;
+ }
+
+ error = xfs_trans_alloc_empty(mp, &tp);
+ if (error)
+ return error;
+
+ error = xfs_alloc_read_agf(mp, tp, agno, 0, &agf_bp);
+ if (error)
+ return error;
+
+ cur = xfs_rmapbt_init_cursor(mp, tp, agf_bp, agno);
+
+ /* 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;
+
+ error = xfs_rmap_query_range(cur, &rmap_low, &rmap_high,
+ xfs_storage_lost_helper, priv);
+ if (error == -ECANCELED)
+ error = 0;
+
+ xfs_btree_del_cursor(cur, error);
+ xfs_trans_brelse(tp, agf_bp);
+ return error;
+}
+
static const struct super_operations xfs_super_operations = {
.alloc_inode = xfs_fs_alloc_inode,
.destroy_inode = xfs_fs_destroy_inode,
@@ -1116,6 +1202,7 @@ static const struct super_operations xfs_super_operations = {
.show_options = xfs_fs_show_options,
.nr_cached_objects = xfs_fs_nr_cached_objects,
.free_cached_objects = xfs_fs_free_cached_objects,
+ .storage_lost = xfs_fs_storage_lost,
};
static int
@@ -1949,6 +1949,8 @@ struct super_operations {
struct shrink_control *);
long (*free_cached_objects)(struct super_block *,
struct shrink_control *);
+ int (*storage_lost)(struct super_block *sb, struct block_device *bdev,
+ loff_t offset, void *priv);
};
/*
@@ -3031,6 +3031,12 @@ extern void shake_page(struct page *p, int access);
extern atomic_long_t num_poisoned_pages __read_mostly;
extern int soft_offline_page(unsigned long pfn, int flags);
+struct mf_recover_controller {
+ int (*recover_fn)(unsigned long pfn, int flags,
+ struct address_space *mapping, pgoff_t index);
+ unsigned long pfn;
+ int flags;
+};
/*
* Error handlers for various types of pages.
This function is used to handle errors which may cause data lost in filesystem. Such as memory-failure in fsdax mode. In XFS, it requires "rmapbt" feature in order to query for files or metadata which associated to the broken block. Then we could call fs recover functions to try to repair the damaged data.(did not implemented in this patch) After that, the memory-failure also needs to kill processes who are using those files. The struct mf_recover_controller is created to store necessary parameters. Only support data device. Realtime device is not supported for now. Signed-off-by: Shiyang Ruan <ruansy.fnst@cn.fujitsu.com> --- fs/xfs/xfs_super.c | 87 ++++++++++++++++++++++++++++++++++++++++++++++ include/linux/fs.h | 2 ++ include/linux/mm.h | 6 ++++ 3 files changed, 95 insertions(+)