f2fs: support to report fserror

This patch supports to report fserror, it provides another way to let
userspace to monitor filesystem level error. In addition, it exports
/sys/fs/f2fs/features/fserror once f2fs kernel module start to support
the new feature, then generic/791 of fstests can notice the feature,
and verify validation of fserror report.

Cc: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

Documentation/ABI/testing/sysfs-fs-f2fs

@@ -270,7 +270,8 @@ Description:	Shows all enabled kernel features.
 		inode_checksum, flexible_inline_xattr, quota_ino,
 		inode_crtime, lost_found, verity, sb_checksum,
 		casefold, readonly, compression, test_dummy_encryption_v2,
-		atomic_write, pin_file, encrypted_casefold, linear_lookup.
+		atomic_write, pin_file, encrypted_casefold, linear_lookup,
+		fserror.
 
 What:		/sys/fs/f2fs/<disk>/inject_rate
 Date:		May 2016

fs/f2fs/compress.c

@@ -14,6 +14,7 @@
 #include <linux/lz4.h>
 #include <linux/zstd.h>
 #include <linux/folio_batch.h>
+#include <linux/fserror.h>
 
 #include "f2fs.h"
 #include "node.h"
@@ -760,6 +761,7 @@ void f2fs_decompress_cluster(struct decompress_io_ctx *dic, bool in_task)
 
 		/* Avoid f2fs_commit_super in irq context */
 		f2fs_handle_error(sbi, ERROR_FAIL_DECOMPRESSION);
+		fserror_report_file_metadata(dic->inode, ret, GFP_NOFS);
 		goto out_release;
 	}
 

fs/f2fs/data.c

@@ -20,6 +20,7 @@
 #include <linux/sched/signal.h>
 #include <linux/fiemap.h>
 #include <linux/iomap.h>
+#include <linux/fserror.h>
 
 #include "f2fs.h"
 #include "node.h"
@@ -377,9 +378,10 @@ static void f2fs_write_end_io(struct bio *bio)
 
 		if (unlikely(bio->bi_status != BLK_STS_OK)) {
 			mapping_set_error(folio->mapping, -EIO);
-			if (type == F2FS_WB_CP_DATA)
+			if (type == F2FS_WB_CP_DATA) {
 				f2fs_stop_checkpoint(sbi, true,
 						STOP_CP_REASON_WRITE_FAIL);
+			}
 		}
 
 		if (is_node_folio(folio)) {
@@ -1750,6 +1752,7 @@ int f2fs_map_blocks(struct inode *inode, struct f2fs_map_blocks *map, int flag)
 			err = -EFSCORRUPTED;
 			f2fs_handle_error(sbi,
 					ERROR_CORRUPTED_CLUSTER);
+			fserror_report_file_metadata(inode, err, GFP_NOFS);
 			goto sync_out;
 		}
 

fs/f2fs/dir.c

@@ -11,6 +11,7 @@
 #include <linux/filelock.h>
 #include <linux/sched/signal.h>
 #include <linux/unicode.h>
+#include <linux/fserror.h>
 #include "f2fs.h"
 #include "node.h"
 #include "acl.h"
@@ -1020,6 +1021,7 @@ int f2fs_fill_dentries(struct dir_context *ctx, struct f2fs_dentry_ptr *d,
 			set_sbi_flag(sbi, SBI_NEED_FSCK);
 			err = -EFSCORRUPTED;
 			f2fs_handle_error(sbi, ERROR_CORRUPTED_DIRENT);
+			fserror_report_file_metadata(d->inode, err, GFP_NOFS);
 			goto out;
 		}
 

fs/f2fs/inline.c

@@ -9,6 +9,7 @@
 #include <linux/fs.h>
 #include <linux/f2fs_fs.h>
 #include <linux/fiemap.h>
+#include <linux/fserror.h>
 
 #include "f2fs.h"
 #include "node.h"
@@ -179,6 +180,7 @@ int f2fs_convert_inline_folio(struct dnode_of_data *dn, struct folio *folio)
 		f2fs_warn(fio.sbi, "%s: corrupted inline inode ino=%llu, i_addr[0]:0x%x, run fsck to fix.",
 			  __func__, dn->inode->i_ino, dn->data_blkaddr);
 		f2fs_handle_error(fio.sbi, ERROR_INVALID_BLKADDR);
+		fserror_report_file_metadata(dn->inode, -EFSCORRUPTED, GFP_NOFS);
 		return -EFSCORRUPTED;
 	}
 
@@ -435,6 +437,7 @@ static int f2fs_move_inline_dirents(struct inode *dir, struct folio *ifolio,
 			  __func__, dir->i_ino, dn.data_blkaddr);
 		f2fs_handle_error(F2FS_F_SB(folio), ERROR_INVALID_BLKADDR);
 		err = -EFSCORRUPTED;
+		fserror_report_file_metadata(dn.inode, err, GFP_NOFS);
 		goto out;
 	}
 

fs/f2fs/inode.c

@@ -11,6 +11,7 @@
 #include <linux/sched/mm.h>
 #include <linux/lz4.h>
 #include <linux/zstd.h>
+#include <linux/fserror.h>
 
 #include "f2fs.h"
 #include "node.h"
@@ -480,6 +481,7 @@ static int do_read_inode(struct inode *inode)
 		f2fs_folio_put(node_folio, true);
 		set_sbi_flag(sbi, SBI_NEED_FSCK);
 		f2fs_handle_error(sbi, ERROR_CORRUPTED_INODE);
+		fserror_report_file_metadata(inode, -EFSCORRUPTED, GFP_NOFS);
 		return -EFSCORRUPTED;
 	}
 
@@ -541,6 +543,7 @@ static int do_read_inode(struct inode *inode)
 	if (!sanity_check_extent_cache(inode, node_folio)) {
 		f2fs_folio_put(node_folio, true);
 		f2fs_handle_error(sbi, ERROR_CORRUPTED_INODE);
+		fserror_report_file_metadata(inode, -EFSCORRUPTED, GFP_NOFS);
 		return -EFSCORRUPTED;
 	}
 
@@ -583,6 +586,7 @@ struct inode *f2fs_iget(struct super_block *sb, unsigned long ino)
 			trace_f2fs_iget_exit(inode, ret);
 			iput(inode);
 			f2fs_handle_error(sbi, ERROR_CORRUPTED_INODE);
+			fserror_report_file_metadata(inode, ret, GFP_NOFS);
 			return ERR_PTR(ret);
 		}
 
@@ -787,6 +791,7 @@ void f2fs_update_inode_page(struct inode *inode)
 		if (err == -ENOMEM || ++count <= DEFAULT_RETRY_IO_COUNT)
 			goto retry;
 stop_checkpoint:
+		fserror_report_file_metadata(inode, -EFSCORRUPTED, GFP_NOFS);
 		f2fs_stop_checkpoint(sbi, false, STOP_CP_REASON_UPDATE_INODE);
 		return;
 	}

fs/f2fs/node.c

@@ -12,6 +12,7 @@
 #include <linux/blkdev.h>
 #include <linux/folio_batch.h>
 #include <linux/swap.h>
+#include <linux/fserror.h>
 
 #include "f2fs.h"
 #include "node.h"
@@ -1265,6 +1266,8 @@ int f2fs_truncate_inode_blocks(struct inode *inode, pgoff_t from)
 		if (err == -ENOENT) {
 			set_sbi_flag(F2FS_F_SB(folio), SBI_NEED_FSCK);
 			f2fs_handle_error(sbi, ERROR_INVALID_BLKADDR);
+			fserror_report_file_metadata(dn.inode, -EFSCORRUPTED,
+								GFP_NOFS);
 			f2fs_err_ratelimited(sbi,
 				"truncate node fail, ino:%llu, nid:%u, "
 				"offset[0]:%d, offset[1]:%d, nofs:%d",
@@ -1556,6 +1559,8 @@ int f2fs_sanity_check_node_footer(struct f2fs_sb_info *sbi,
 		next_blkaddr_of_node(folio));
 
 	f2fs_handle_error(sbi, ERROR_INCONSISTENT_FOOTER);
+	fserror_report_file_metadata(folio->mapping->host,
+			-EFSCORRUPTED, in_irq ? GFP_NOWAIT : GFP_NOFS);
 	return -EFSCORRUPTED;
 }
 
@@ -1778,6 +1783,7 @@ static bool __write_node_folio(struct folio *folio, bool atomic, bool do_fsync,
 
 	if (f2fs_sanity_check_node_footer(sbi, folio, nid,
 					NODE_TYPE_REGULAR, false)) {
+		fserror_report_metadata(sbi->sb, -EFSCORRUPTED, GFP_NOFS);
 		f2fs_stop_checkpoint(sbi, false, STOP_CP_REASON_CORRUPTED_NID);
 		goto redirty_out;
 	}
@@ -2703,6 +2709,8 @@ bool f2fs_alloc_nid(struct f2fs_sb_info *sbi, nid_t *nid)
 			spin_unlock(&nm_i->nid_list_lock);
 			f2fs_err(sbi, "Corrupted nid %u in free_nid_list",
 								i->nid);
+			fserror_report_metadata(sbi->sb, -EFSCORRUPTED,
+								GFP_NOFS);
 			f2fs_stop_checkpoint(sbi, false,
 					STOP_CP_REASON_CORRUPTED_NID);
 			return false;

fs/f2fs/recovery.c

@@ -9,6 +9,7 @@
 #include <linux/fs.h>
 #include <linux/f2fs_fs.h>
 #include <linux/sched/mm.h>
+#include <linux/fserror.h>
 #include "f2fs.h"
 #include "node.h"
 #include "segment.h"
@@ -679,6 +680,7 @@ static int do_recover_data(struct f2fs_sb_info *sbi, struct inode *inode,
 			  ofs_of_node(folio));
 		err = -EFSCORRUPTED;
 		f2fs_handle_error(sbi, ERROR_INCONSISTENT_FOOTER);
+		fserror_report_file_metadata(dn.inode, err, GFP_NOFS);
 		goto err;
 	}
 

fs/f2fs/segment.c

@@ -17,6 +17,7 @@
 #include <linux/freezer.h>
 #include <linux/sched/signal.h>
 #include <linux/random.h>
+#include <linux/fserror.h>
 
 #include "f2fs.h"
 #include "segment.h"
@@ -2896,6 +2897,7 @@ static int get_new_segment(struct f2fs_sb_info *sbi,
 	/* set it as dirty segment in free segmap */
 	if (test_bit(segno, free_i->free_segmap)) {
 		ret = -EFSCORRUPTED;
+		fserror_report_metadata(sbi->sb, -EFSCORRUPTED, GFP_NOFS);
 		f2fs_stop_checkpoint(sbi, false, STOP_CP_REASON_CORRUPTED_FREE_BITMAP);
 		goto out_unlock;
 	}

fs/f2fs/super.c

@@ -29,6 +29,7 @@
 #include <linux/lz4.h>
 #include <linux/ctype.h>
 #include <linux/fs_parser.h>
+#include <linux/fserror.h>
 
 #include "f2fs.h"
 #include "node.h"
@@ -4635,6 +4636,8 @@ static void f2fs_record_stop_reason(struct f2fs_sb_info *sbi)
 		f2fs_err_ratelimited(sbi,
 			"f2fs_commit_super fails to record stop_reason, err:%d",
 			err);
+
+	fserror_report_shutdown(sbi->sb, GFP_NOFS);
 }
 
 void f2fs_save_errors(struct f2fs_sb_info *sbi, unsigned char flag)
@@ -4649,6 +4652,27 @@ void f2fs_save_errors(struct f2fs_sb_info *sbi, unsigned char flag)
 	spin_unlock_irqrestore(&sbi->error_lock, flags);
 }
 
+static void f2fs_report_fserror(struct f2fs_sb_info *sbi, unsigned char error)
+{
+	switch (error) {
+	case ERROR_INVALID_BLKADDR:
+	case ERROR_CORRUPTED_INODE:
+	case ERROR_INCONSISTENT_SUMMARY:
+	case ERROR_INCONSISTENT_SUM_TYPE:
+	case ERROR_CORRUPTED_JOURNAL:
+	case ERROR_INCONSISTENT_NODE_COUNT:
+	case ERROR_INCONSISTENT_BLOCK_COUNT:
+	case ERROR_INVALID_CURSEG:
+	case ERROR_INCONSISTENT_SIT:
+	case ERROR_INVALID_NODE_REFERENCE:
+	case ERROR_INCONSISTENT_NAT:
+		fserror_report_metadata(sbi->sb, -EFSCORRUPTED, GFP_NOFS);
+		break;
+	default:
+		return;
+	}
+}
+
 void f2fs_handle_error(struct f2fs_sb_info *sbi, unsigned char error)
 {
 	f2fs_save_errors(sbi, error);
@@ -4658,6 +4682,8 @@ void f2fs_handle_error(struct f2fs_sb_info *sbi, unsigned char error)
 	if (!test_bit(error, (unsigned long *)sbi->errors))
 		return;
 	schedule_work(&sbi->s_error_work);
+
+	f2fs_report_fserror(sbi, error);
 }
 
 static bool system_going_down(void)

fs/f2fs/sysfs.c

@@ -1399,6 +1399,7 @@ F2FS_FEATURE_RO_ATTR(pin_file);
 F2FS_FEATURE_RO_ATTR(linear_lookup);
 #endif
 F2FS_FEATURE_RO_ATTR(packed_ssa);
+F2FS_FEATURE_RO_ATTR(fserror);
 
 #define ATTR_LIST(name) (&f2fs_attr_##name.attr)
 static struct attribute *f2fs_attrs[] = {
@@ -1566,6 +1567,7 @@ static struct attribute *f2fs_feat_attrs[] = {
 	BASE_ATTR_LIST(linear_lookup),
 #endif
 	BASE_ATTR_LIST(packed_ssa),
+	BASE_ATTR_LIST(fserror),
 	NULL,
 };
 ATTRIBUTE_GROUPS(f2fs_feat);

fs/f2fs/verity.c

@@ -25,6 +25,7 @@
  */
 
 #include <linux/f2fs_fs.h>
+#include <linux/fserror.h>
 
 #include "f2fs.h"
 #include "xattr.h"
@@ -243,6 +244,7 @@ static int f2fs_get_verity_descriptor(struct inode *inode, void *buf,
 		f2fs_warn(F2FS_I_SB(inode), "invalid verity xattr");
 		f2fs_handle_error(F2FS_I_SB(inode),
 				ERROR_CORRUPTED_VERITY_XATTR);
+		fserror_report_file_metadata(inode, -EFSCORRUPTED, GFP_NOFS);
 		return -EFSCORRUPTED;
 	}
 	if (buf_size) {

fs/f2fs/xattr.c

@@ -19,6 +19,7 @@
 #include <linux/f2fs_fs.h>
 #include <linux/security.h>
 #include <linux/posix_acl_xattr.h>
+#include <linux/fserror.h>
 #include "f2fs.h"
 #include "xattr.h"
 #include "segment.h"
@@ -371,6 +372,7 @@ static int lookup_all_xattrs(struct inode *inode, struct folio *ifolio,
 		err = -ENODATA;
 		f2fs_handle_error(F2FS_I_SB(inode),
 					ERROR_CORRUPTED_XATTR);
+		fserror_report_file_metadata(inode, err, GFP_NOFS);
 		goto out;
 	}
 check:
@@ -590,6 +592,8 @@ ssize_t f2fs_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size)
 			set_sbi_flag(F2FS_I_SB(inode), SBI_NEED_FSCK);
 			f2fs_handle_error(F2FS_I_SB(inode),
 						ERROR_CORRUPTED_XATTR);
+			fserror_report_file_metadata(inode,
+						-EFSCORRUPTED, GFP_NOFS);
 			break;
 		}
 
@@ -677,6 +681,7 @@ static int __f2fs_setxattr(struct inode *inode, int index,
 		error = -EFSCORRUPTED;
 		f2fs_handle_error(F2FS_I_SB(inode),
 					ERROR_CORRUPTED_XATTR);
+		fserror_report_file_metadata(inode, error, GFP_NOFS);
 		goto exit;
 	}
 
@@ -705,6 +710,7 @@ static int __f2fs_setxattr(struct inode *inode, int index,
 			error = -EFSCORRUPTED;
 			f2fs_handle_error(F2FS_I_SB(inode),
 						ERROR_CORRUPTED_XATTR);
+			fserror_report_file_metadata(inode, error, GFP_NOFS);
 			goto exit;
 		}
 		last = XATTR_NEXT_ENTRY(last);