v4.19.13 snapshot.
diff --git a/fs/f2fs/recovery.c b/fs/f2fs/recovery.c
new file mode 100644
index 0000000..9a8579f
--- /dev/null
+++ b/fs/f2fs/recovery.c
@@ -0,0 +1,722 @@
+/*
+ * fs/f2fs/recovery.c
+ *
+ * Copyright (c) 2012 Samsung Electronics Co., Ltd.
+ * http://www.samsung.com/
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/fs.h>
+#include <linux/f2fs_fs.h>
+#include "f2fs.h"
+#include "node.h"
+#include "segment.h"
+
+/*
+ * Roll forward recovery scenarios.
+ *
+ * [Term] F: fsync_mark, D: dentry_mark
+ *
+ * 1. inode(x) | CP | inode(x) | dnode(F)
+ * -> Update the latest inode(x).
+ *
+ * 2. inode(x) | CP | inode(F) | dnode(F)
+ * -> No problem.
+ *
+ * 3. inode(x) | CP | dnode(F) | inode(x)
+ * -> Recover to the latest dnode(F), and drop the last inode(x)
+ *
+ * 4. inode(x) | CP | dnode(F) | inode(F)
+ * -> No problem.
+ *
+ * 5. CP | inode(x) | dnode(F)
+ * -> The inode(DF) was missing. Should drop this dnode(F).
+ *
+ * 6. CP | inode(DF) | dnode(F)
+ * -> No problem.
+ *
+ * 7. CP | dnode(F) | inode(DF)
+ * -> If f2fs_iget fails, then goto next to find inode(DF).
+ *
+ * 8. CP | dnode(F) | inode(x)
+ * -> If f2fs_iget fails, then goto next to find inode(DF).
+ * But it will fail due to no inode(DF).
+ */
+
+static struct kmem_cache *fsync_entry_slab;
+
+bool f2fs_space_for_roll_forward(struct f2fs_sb_info *sbi)
+{
+ s64 nalloc = percpu_counter_sum_positive(&sbi->alloc_valid_block_count);
+
+ if (sbi->last_valid_block_count + nalloc > sbi->user_block_count)
+ return false;
+ return true;
+}
+
+static struct fsync_inode_entry *get_fsync_inode(struct list_head *head,
+ nid_t ino)
+{
+ struct fsync_inode_entry *entry;
+
+ list_for_each_entry(entry, head, list)
+ if (entry->inode->i_ino == ino)
+ return entry;
+
+ return NULL;
+}
+
+static struct fsync_inode_entry *add_fsync_inode(struct f2fs_sb_info *sbi,
+ struct list_head *head, nid_t ino, bool quota_inode)
+{
+ struct inode *inode;
+ struct fsync_inode_entry *entry;
+ int err;
+
+ inode = f2fs_iget_retry(sbi->sb, ino);
+ if (IS_ERR(inode))
+ return ERR_CAST(inode);
+
+ err = dquot_initialize(inode);
+ if (err)
+ goto err_out;
+
+ if (quota_inode) {
+ err = dquot_alloc_inode(inode);
+ if (err)
+ goto err_out;
+ }
+
+ entry = f2fs_kmem_cache_alloc(fsync_entry_slab, GFP_F2FS_ZERO);
+ entry->inode = inode;
+ list_add_tail(&entry->list, head);
+
+ return entry;
+err_out:
+ iput(inode);
+ return ERR_PTR(err);
+}
+
+static void del_fsync_inode(struct fsync_inode_entry *entry)
+{
+ iput(entry->inode);
+ list_del(&entry->list);
+ kmem_cache_free(fsync_entry_slab, entry);
+}
+
+static int recover_dentry(struct inode *inode, struct page *ipage,
+ struct list_head *dir_list)
+{
+ struct f2fs_inode *raw_inode = F2FS_INODE(ipage);
+ nid_t pino = le32_to_cpu(raw_inode->i_pino);
+ struct f2fs_dir_entry *de;
+ struct fscrypt_name fname;
+ struct page *page;
+ struct inode *dir, *einode;
+ struct fsync_inode_entry *entry;
+ int err = 0;
+ char *name;
+
+ entry = get_fsync_inode(dir_list, pino);
+ if (!entry) {
+ entry = add_fsync_inode(F2FS_I_SB(inode), dir_list,
+ pino, false);
+ if (IS_ERR(entry)) {
+ dir = ERR_CAST(entry);
+ err = PTR_ERR(entry);
+ goto out;
+ }
+ }
+
+ dir = entry->inode;
+
+ memset(&fname, 0, sizeof(struct fscrypt_name));
+ fname.disk_name.len = le32_to_cpu(raw_inode->i_namelen);
+ fname.disk_name.name = raw_inode->i_name;
+
+ if (unlikely(fname.disk_name.len > F2FS_NAME_LEN)) {
+ WARN_ON(1);
+ err = -ENAMETOOLONG;
+ goto out;
+ }
+retry:
+ de = __f2fs_find_entry(dir, &fname, &page);
+ if (de && inode->i_ino == le32_to_cpu(de->ino))
+ goto out_put;
+
+ if (de) {
+ einode = f2fs_iget_retry(inode->i_sb, le32_to_cpu(de->ino));
+ if (IS_ERR(einode)) {
+ WARN_ON(1);
+ err = PTR_ERR(einode);
+ if (err == -ENOENT)
+ err = -EEXIST;
+ goto out_put;
+ }
+
+ err = dquot_initialize(einode);
+ if (err) {
+ iput(einode);
+ goto out_put;
+ }
+
+ err = f2fs_acquire_orphan_inode(F2FS_I_SB(inode));
+ if (err) {
+ iput(einode);
+ goto out_put;
+ }
+ f2fs_delete_entry(de, page, dir, einode);
+ iput(einode);
+ goto retry;
+ } else if (IS_ERR(page)) {
+ err = PTR_ERR(page);
+ } else {
+ err = f2fs_add_dentry(dir, &fname, inode,
+ inode->i_ino, inode->i_mode);
+ }
+ if (err == -ENOMEM)
+ goto retry;
+ goto out;
+
+out_put:
+ f2fs_put_page(page, 0);
+out:
+ if (file_enc_name(inode))
+ name = "<encrypted>";
+ else
+ name = raw_inode->i_name;
+ f2fs_msg(inode->i_sb, KERN_NOTICE,
+ "%s: ino = %x, name = %s, dir = %lx, err = %d",
+ __func__, ino_of_node(ipage), name,
+ IS_ERR(dir) ? 0 : dir->i_ino, err);
+ return err;
+}
+
+static void recover_inline_flags(struct inode *inode, struct f2fs_inode *ri)
+{
+ if (ri->i_inline & F2FS_PIN_FILE)
+ set_inode_flag(inode, FI_PIN_FILE);
+ else
+ clear_inode_flag(inode, FI_PIN_FILE);
+ if (ri->i_inline & F2FS_DATA_EXIST)
+ set_inode_flag(inode, FI_DATA_EXIST);
+ else
+ clear_inode_flag(inode, FI_DATA_EXIST);
+}
+
+static void recover_inode(struct inode *inode, struct page *page)
+{
+ struct f2fs_inode *raw = F2FS_INODE(page);
+ char *name;
+
+ inode->i_mode = le16_to_cpu(raw->i_mode);
+ f2fs_i_size_write(inode, le64_to_cpu(raw->i_size));
+ inode->i_atime.tv_sec = le64_to_cpu(raw->i_atime);
+ inode->i_ctime.tv_sec = le64_to_cpu(raw->i_ctime);
+ inode->i_mtime.tv_sec = le64_to_cpu(raw->i_mtime);
+ inode->i_atime.tv_nsec = le32_to_cpu(raw->i_atime_nsec);
+ inode->i_ctime.tv_nsec = le32_to_cpu(raw->i_ctime_nsec);
+ inode->i_mtime.tv_nsec = le32_to_cpu(raw->i_mtime_nsec);
+
+ F2FS_I(inode)->i_advise = raw->i_advise;
+ F2FS_I(inode)->i_flags = le32_to_cpu(raw->i_flags);
+
+ recover_inline_flags(inode, raw);
+
+ if (file_enc_name(inode))
+ name = "<encrypted>";
+ else
+ name = F2FS_INODE(page)->i_name;
+
+ f2fs_msg(inode->i_sb, KERN_NOTICE,
+ "recover_inode: ino = %x, name = %s, inline = %x",
+ ino_of_node(page), name, raw->i_inline);
+}
+
+static int find_fsync_dnodes(struct f2fs_sb_info *sbi, struct list_head *head,
+ bool check_only)
+{
+ struct curseg_info *curseg;
+ struct page *page = NULL;
+ block_t blkaddr;
+ unsigned int loop_cnt = 0;
+ unsigned int free_blocks = MAIN_SEGS(sbi) * sbi->blocks_per_seg -
+ valid_user_blocks(sbi);
+ int err = 0;
+
+ /* get node pages in the current segment */
+ curseg = CURSEG_I(sbi, CURSEG_WARM_NODE);
+ blkaddr = NEXT_FREE_BLKADDR(sbi, curseg);
+
+ while (1) {
+ struct fsync_inode_entry *entry;
+
+ if (!f2fs_is_valid_blkaddr(sbi, blkaddr, META_POR))
+ return 0;
+
+ page = f2fs_get_tmp_page(sbi, blkaddr);
+ if (IS_ERR(page)) {
+ err = PTR_ERR(page);
+ break;
+ }
+
+ if (!is_recoverable_dnode(page))
+ break;
+
+ if (!is_fsync_dnode(page))
+ goto next;
+
+ entry = get_fsync_inode(head, ino_of_node(page));
+ if (!entry) {
+ bool quota_inode = false;
+
+ if (!check_only &&
+ IS_INODE(page) && is_dent_dnode(page)) {
+ err = f2fs_recover_inode_page(sbi, page);
+ if (err)
+ break;
+ quota_inode = true;
+ }
+
+ /*
+ * CP | dnode(F) | inode(DF)
+ * For this case, we should not give up now.
+ */
+ entry = add_fsync_inode(sbi, head, ino_of_node(page),
+ quota_inode);
+ if (IS_ERR(entry)) {
+ err = PTR_ERR(entry);
+ if (err == -ENOENT) {
+ err = 0;
+ goto next;
+ }
+ break;
+ }
+ }
+ entry->blkaddr = blkaddr;
+
+ if (IS_INODE(page) && is_dent_dnode(page))
+ entry->last_dentry = blkaddr;
+next:
+ /* sanity check in order to detect looped node chain */
+ if (++loop_cnt >= free_blocks ||
+ blkaddr == next_blkaddr_of_node(page)) {
+ f2fs_msg(sbi->sb, KERN_NOTICE,
+ "%s: detect looped node chain, "
+ "blkaddr:%u, next:%u",
+ __func__, blkaddr, next_blkaddr_of_node(page));
+ err = -EINVAL;
+ break;
+ }
+
+ /* check next segment */
+ blkaddr = next_blkaddr_of_node(page);
+ f2fs_put_page(page, 1);
+
+ f2fs_ra_meta_pages_cond(sbi, blkaddr);
+ }
+ f2fs_put_page(page, 1);
+ return err;
+}
+
+static void destroy_fsync_dnodes(struct list_head *head)
+{
+ struct fsync_inode_entry *entry, *tmp;
+
+ list_for_each_entry_safe(entry, tmp, head, list)
+ del_fsync_inode(entry);
+}
+
+static int check_index_in_prev_nodes(struct f2fs_sb_info *sbi,
+ block_t blkaddr, struct dnode_of_data *dn)
+{
+ struct seg_entry *sentry;
+ unsigned int segno = GET_SEGNO(sbi, blkaddr);
+ unsigned short blkoff = GET_BLKOFF_FROM_SEG0(sbi, blkaddr);
+ struct f2fs_summary_block *sum_node;
+ struct f2fs_summary sum;
+ struct page *sum_page, *node_page;
+ struct dnode_of_data tdn = *dn;
+ nid_t ino, nid;
+ struct inode *inode;
+ unsigned int offset;
+ block_t bidx;
+ int i;
+
+ sentry = get_seg_entry(sbi, segno);
+ if (!f2fs_test_bit(blkoff, sentry->cur_valid_map))
+ return 0;
+
+ /* Get the previous summary */
+ for (i = CURSEG_HOT_DATA; i <= CURSEG_COLD_DATA; i++) {
+ struct curseg_info *curseg = CURSEG_I(sbi, i);
+ if (curseg->segno == segno) {
+ sum = curseg->sum_blk->entries[blkoff];
+ goto got_it;
+ }
+ }
+
+ sum_page = f2fs_get_sum_page(sbi, segno);
+ sum_node = (struct f2fs_summary_block *)page_address(sum_page);
+ sum = sum_node->entries[blkoff];
+ f2fs_put_page(sum_page, 1);
+got_it:
+ /* Use the locked dnode page and inode */
+ nid = le32_to_cpu(sum.nid);
+ if (dn->inode->i_ino == nid) {
+ tdn.nid = nid;
+ if (!dn->inode_page_locked)
+ lock_page(dn->inode_page);
+ tdn.node_page = dn->inode_page;
+ tdn.ofs_in_node = le16_to_cpu(sum.ofs_in_node);
+ goto truncate_out;
+ } else if (dn->nid == nid) {
+ tdn.ofs_in_node = le16_to_cpu(sum.ofs_in_node);
+ goto truncate_out;
+ }
+
+ /* Get the node page */
+ node_page = f2fs_get_node_page(sbi, nid);
+ if (IS_ERR(node_page))
+ return PTR_ERR(node_page);
+
+ offset = ofs_of_node(node_page);
+ ino = ino_of_node(node_page);
+ f2fs_put_page(node_page, 1);
+
+ if (ino != dn->inode->i_ino) {
+ int ret;
+
+ /* Deallocate previous index in the node page */
+ inode = f2fs_iget_retry(sbi->sb, ino);
+ if (IS_ERR(inode))
+ return PTR_ERR(inode);
+
+ ret = dquot_initialize(inode);
+ if (ret) {
+ iput(inode);
+ return ret;
+ }
+ } else {
+ inode = dn->inode;
+ }
+
+ bidx = f2fs_start_bidx_of_node(offset, inode) +
+ le16_to_cpu(sum.ofs_in_node);
+
+ /*
+ * if inode page is locked, unlock temporarily, but its reference
+ * count keeps alive.
+ */
+ if (ino == dn->inode->i_ino && dn->inode_page_locked)
+ unlock_page(dn->inode_page);
+
+ set_new_dnode(&tdn, inode, NULL, NULL, 0);
+ if (f2fs_get_dnode_of_data(&tdn, bidx, LOOKUP_NODE))
+ goto out;
+
+ if (tdn.data_blkaddr == blkaddr)
+ f2fs_truncate_data_blocks_range(&tdn, 1);
+
+ f2fs_put_dnode(&tdn);
+out:
+ if (ino != dn->inode->i_ino)
+ iput(inode);
+ else if (dn->inode_page_locked)
+ lock_page(dn->inode_page);
+ return 0;
+
+truncate_out:
+ if (datablock_addr(tdn.inode, tdn.node_page,
+ tdn.ofs_in_node) == blkaddr)
+ f2fs_truncate_data_blocks_range(&tdn, 1);
+ if (dn->inode->i_ino == nid && !dn->inode_page_locked)
+ unlock_page(dn->inode_page);
+ return 0;
+}
+
+static int do_recover_data(struct f2fs_sb_info *sbi, struct inode *inode,
+ struct page *page)
+{
+ struct dnode_of_data dn;
+ struct node_info ni;
+ unsigned int start, end;
+ int err = 0, recovered = 0;
+
+ /* step 1: recover xattr */
+ if (IS_INODE(page)) {
+ f2fs_recover_inline_xattr(inode, page);
+ } else if (f2fs_has_xattr_block(ofs_of_node(page))) {
+ err = f2fs_recover_xattr_data(inode, page);
+ if (!err)
+ recovered++;
+ goto out;
+ }
+
+ /* step 2: recover inline data */
+ if (f2fs_recover_inline_data(inode, page))
+ goto out;
+
+ /* step 3: recover data indices */
+ start = f2fs_start_bidx_of_node(ofs_of_node(page), inode);
+ end = start + ADDRS_PER_PAGE(page, inode);
+
+ set_new_dnode(&dn, inode, NULL, NULL, 0);
+retry_dn:
+ err = f2fs_get_dnode_of_data(&dn, start, ALLOC_NODE);
+ if (err) {
+ if (err == -ENOMEM) {
+ congestion_wait(BLK_RW_ASYNC, HZ/50);
+ goto retry_dn;
+ }
+ goto out;
+ }
+
+ f2fs_wait_on_page_writeback(dn.node_page, NODE, true);
+
+ err = f2fs_get_node_info(sbi, dn.nid, &ni);
+ if (err)
+ goto err;
+
+ f2fs_bug_on(sbi, ni.ino != ino_of_node(page));
+ f2fs_bug_on(sbi, ofs_of_node(dn.node_page) != ofs_of_node(page));
+
+ for (; start < end; start++, dn.ofs_in_node++) {
+ block_t src, dest;
+
+ src = datablock_addr(dn.inode, dn.node_page, dn.ofs_in_node);
+ dest = datablock_addr(dn.inode, page, dn.ofs_in_node);
+
+ /* skip recovering if dest is the same as src */
+ if (src == dest)
+ continue;
+
+ /* dest is invalid, just invalidate src block */
+ if (dest == NULL_ADDR) {
+ f2fs_truncate_data_blocks_range(&dn, 1);
+ continue;
+ }
+
+ if (!file_keep_isize(inode) &&
+ (i_size_read(inode) <= ((loff_t)start << PAGE_SHIFT)))
+ f2fs_i_size_write(inode,
+ (loff_t)(start + 1) << PAGE_SHIFT);
+
+ /*
+ * dest is reserved block, invalidate src block
+ * and then reserve one new block in dnode page.
+ */
+ if (dest == NEW_ADDR) {
+ f2fs_truncate_data_blocks_range(&dn, 1);
+ f2fs_reserve_new_block(&dn);
+ continue;
+ }
+
+ /* dest is valid block, try to recover from src to dest */
+ if (f2fs_is_valid_blkaddr(sbi, dest, META_POR)) {
+
+ if (src == NULL_ADDR) {
+ err = f2fs_reserve_new_block(&dn);
+ while (err &&
+ IS_ENABLED(CONFIG_F2FS_FAULT_INJECTION))
+ err = f2fs_reserve_new_block(&dn);
+ /* We should not get -ENOSPC */
+ f2fs_bug_on(sbi, err);
+ if (err)
+ goto err;
+ }
+retry_prev:
+ /* Check the previous node page having this index */
+ err = check_index_in_prev_nodes(sbi, dest, &dn);
+ if (err) {
+ if (err == -ENOMEM) {
+ congestion_wait(BLK_RW_ASYNC, HZ/50);
+ goto retry_prev;
+ }
+ goto err;
+ }
+
+ /* write dummy data page */
+ f2fs_replace_block(sbi, &dn, src, dest,
+ ni.version, false, false);
+ recovered++;
+ }
+ }
+
+ copy_node_footer(dn.node_page, page);
+ fill_node_footer(dn.node_page, dn.nid, ni.ino,
+ ofs_of_node(page), false);
+ set_page_dirty(dn.node_page);
+err:
+ f2fs_put_dnode(&dn);
+out:
+ f2fs_msg(sbi->sb, KERN_NOTICE,
+ "recover_data: ino = %lx (i_size: %s) recovered = %d, err = %d",
+ inode->i_ino,
+ file_keep_isize(inode) ? "keep" : "recover",
+ recovered, err);
+ return err;
+}
+
+static int recover_data(struct f2fs_sb_info *sbi, struct list_head *inode_list,
+ struct list_head *dir_list)
+{
+ struct curseg_info *curseg;
+ struct page *page = NULL;
+ int err = 0;
+ block_t blkaddr;
+
+ /* get node pages in the current segment */
+ curseg = CURSEG_I(sbi, CURSEG_WARM_NODE);
+ blkaddr = NEXT_FREE_BLKADDR(sbi, curseg);
+
+ while (1) {
+ struct fsync_inode_entry *entry;
+
+ if (!f2fs_is_valid_blkaddr(sbi, blkaddr, META_POR))
+ break;
+
+ f2fs_ra_meta_pages_cond(sbi, blkaddr);
+
+ page = f2fs_get_tmp_page(sbi, blkaddr);
+ if (IS_ERR(page)) {
+ err = PTR_ERR(page);
+ break;
+ }
+
+ if (!is_recoverable_dnode(page)) {
+ f2fs_put_page(page, 1);
+ break;
+ }
+
+ entry = get_fsync_inode(inode_list, ino_of_node(page));
+ if (!entry)
+ goto next;
+ /*
+ * inode(x) | CP | inode(x) | dnode(F)
+ * In this case, we can lose the latest inode(x).
+ * So, call recover_inode for the inode update.
+ */
+ if (IS_INODE(page))
+ recover_inode(entry->inode, page);
+ if (entry->last_dentry == blkaddr) {
+ err = recover_dentry(entry->inode, page, dir_list);
+ if (err) {
+ f2fs_put_page(page, 1);
+ break;
+ }
+ }
+ err = do_recover_data(sbi, entry->inode, page);
+ if (err) {
+ f2fs_put_page(page, 1);
+ break;
+ }
+
+ if (entry->blkaddr == blkaddr)
+ del_fsync_inode(entry);
+next:
+ /* check next segment */
+ blkaddr = next_blkaddr_of_node(page);
+ f2fs_put_page(page, 1);
+ }
+ if (!err)
+ f2fs_allocate_new_segments(sbi);
+ return err;
+}
+
+int f2fs_recover_fsync_data(struct f2fs_sb_info *sbi, bool check_only)
+{
+ struct list_head inode_list;
+ struct list_head dir_list;
+ int err;
+ int ret = 0;
+ unsigned long s_flags = sbi->sb->s_flags;
+ bool need_writecp = false;
+#ifdef CONFIG_QUOTA
+ int quota_enabled;
+#endif
+
+ if (s_flags & SB_RDONLY) {
+ f2fs_msg(sbi->sb, KERN_INFO,
+ "recover fsync data on readonly fs");
+ sbi->sb->s_flags &= ~SB_RDONLY;
+ }
+
+#ifdef CONFIG_QUOTA
+ /* Needed for iput() to work correctly and not trash data */
+ sbi->sb->s_flags |= SB_ACTIVE;
+ /* Turn on quotas so that they are updated correctly */
+ quota_enabled = f2fs_enable_quota_files(sbi, s_flags & SB_RDONLY);
+#endif
+
+ fsync_entry_slab = f2fs_kmem_cache_create("f2fs_fsync_inode_entry",
+ sizeof(struct fsync_inode_entry));
+ if (!fsync_entry_slab) {
+ err = -ENOMEM;
+ goto out;
+ }
+
+ INIT_LIST_HEAD(&inode_list);
+ INIT_LIST_HEAD(&dir_list);
+
+ /* prevent checkpoint */
+ mutex_lock(&sbi->cp_mutex);
+
+ /* step #1: find fsynced inode numbers */
+ err = find_fsync_dnodes(sbi, &inode_list, check_only);
+ if (err || list_empty(&inode_list))
+ goto skip;
+
+ if (check_only) {
+ ret = 1;
+ goto skip;
+ }
+
+ need_writecp = true;
+
+ /* step #2: recover data */
+ err = recover_data(sbi, &inode_list, &dir_list);
+ if (!err)
+ f2fs_bug_on(sbi, !list_empty(&inode_list));
+skip:
+ destroy_fsync_dnodes(&inode_list);
+
+ /* truncate meta pages to be used by the recovery */
+ truncate_inode_pages_range(META_MAPPING(sbi),
+ (loff_t)MAIN_BLKADDR(sbi) << PAGE_SHIFT, -1);
+
+ if (err) {
+ truncate_inode_pages_final(NODE_MAPPING(sbi));
+ truncate_inode_pages_final(META_MAPPING(sbi));
+ }
+
+ clear_sbi_flag(sbi, SBI_POR_DOING);
+ mutex_unlock(&sbi->cp_mutex);
+
+ /* let's drop all the directory inodes for clean checkpoint */
+ destroy_fsync_dnodes(&dir_list);
+
+ if (need_writecp) {
+ set_sbi_flag(sbi, SBI_IS_RECOVERED);
+
+ if (!err) {
+ struct cp_control cpc = {
+ .reason = CP_RECOVERY,
+ };
+ err = f2fs_write_checkpoint(sbi, &cpc);
+ }
+ }
+
+ kmem_cache_destroy(fsync_entry_slab);
+out:
+#ifdef CONFIG_QUOTA
+ /* Turn quotas off */
+ if (quota_enabled)
+ f2fs_quota_off_umount(sbi->sb);
+#endif
+ sbi->sb->s_flags = s_flags; /* Restore SB_RDONLY status */
+
+ return ret ? ret: err;
+}