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-rw-r--r--kernel/fs/f2fs/recovery.c575
1 files changed, 575 insertions, 0 deletions
diff --git a/kernel/fs/f2fs/recovery.c b/kernel/fs/f2fs/recovery.c
new file mode 100644
index 000000000..8d8ea99f2
--- /dev/null
+++ b/kernel/fs/f2fs/recovery.c
@@ -0,0 +1,575 @@
+/*
+ * 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 space_for_roll_forward(struct f2fs_sb_info *sbi)
+{
+ if (sbi->last_valid_block_count + sbi->alloc_valid_block_count
+ > 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 int recover_dentry(struct inode *inode, struct page *ipage)
+{
+ struct f2fs_inode *raw_inode = F2FS_INODE(ipage);
+ nid_t pino = le32_to_cpu(raw_inode->i_pino);
+ struct f2fs_dir_entry *de;
+ struct qstr name;
+ struct page *page;
+ struct inode *dir, *einode;
+ int err = 0;
+
+ dir = f2fs_iget(inode->i_sb, pino);
+ if (IS_ERR(dir)) {
+ err = PTR_ERR(dir);
+ goto out;
+ }
+
+ name.len = le32_to_cpu(raw_inode->i_namelen);
+ name.name = raw_inode->i_name;
+
+ if (unlikely(name.len > F2FS_NAME_LEN)) {
+ WARN_ON(1);
+ err = -ENAMETOOLONG;
+ goto out_err;
+ }
+retry:
+ de = f2fs_find_entry(dir, &name, &page);
+ if (de && inode->i_ino == le32_to_cpu(de->ino))
+ goto out_unmap_put;
+
+ if (de) {
+ einode = f2fs_iget(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_unmap_put;
+ }
+ err = acquire_orphan_inode(F2FS_I_SB(inode));
+ if (err) {
+ iput(einode);
+ goto out_unmap_put;
+ }
+ f2fs_delete_entry(de, page, dir, einode);
+ iput(einode);
+ goto retry;
+ }
+ err = __f2fs_add_link(dir, &name, inode, inode->i_ino, inode->i_mode);
+ if (err)
+ goto out_err;
+
+ if (is_inode_flag_set(F2FS_I(dir), FI_DELAY_IPUT)) {
+ iput(dir);
+ } else {
+ add_dirty_dir_inode(dir);
+ set_inode_flag(F2FS_I(dir), FI_DELAY_IPUT);
+ }
+
+ goto out;
+
+out_unmap_put:
+ f2fs_dentry_kunmap(dir, page);
+ f2fs_put_page(page, 0);
+out_err:
+ iput(dir);
+out:
+ f2fs_msg(inode->i_sb, KERN_NOTICE,
+ "%s: ino = %x, name = %s, dir = %lx, err = %d",
+ __func__, ino_of_node(ipage), raw_inode->i_name,
+ IS_ERR(dir) ? 0 : dir->i_ino, err);
+ return err;
+}
+
+static void recover_inode(struct inode *inode, struct page *page)
+{
+ struct f2fs_inode *raw = F2FS_INODE(page);
+
+ inode->i_mode = le16_to_cpu(raw->i_mode);
+ i_size_write(inode, le64_to_cpu(raw->i_size));
+ inode->i_atime.tv_sec = le64_to_cpu(raw->i_mtime);
+ 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_mtime_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_msg(inode->i_sb, KERN_NOTICE, "recover_inode: ino = %x, name = %s",
+ ino_of_node(page), F2FS_INODE(page)->i_name);
+}
+
+static int find_fsync_dnodes(struct f2fs_sb_info *sbi, struct list_head *head)
+{
+ unsigned long long cp_ver = cur_cp_version(F2FS_CKPT(sbi));
+ struct curseg_info *curseg;
+ struct page *page = NULL;
+ block_t blkaddr;
+ int err = 0;
+
+ /* get node pages in the current segment */
+ curseg = CURSEG_I(sbi, CURSEG_WARM_NODE);
+ blkaddr = NEXT_FREE_BLKADDR(sbi, curseg);
+
+ ra_meta_pages(sbi, blkaddr, 1, META_POR);
+
+ while (1) {
+ struct fsync_inode_entry *entry;
+
+ if (blkaddr < MAIN_BLKADDR(sbi) || blkaddr >= MAX_BLKADDR(sbi))
+ return 0;
+
+ page = get_meta_page(sbi, blkaddr);
+
+ if (cp_ver != cpver_of_node(page))
+ break;
+
+ if (!is_fsync_dnode(page))
+ goto next;
+
+ entry = get_fsync_inode(head, ino_of_node(page));
+ if (!entry) {
+ if (IS_INODE(page) && is_dent_dnode(page)) {
+ err = recover_inode_page(sbi, page);
+ if (err)
+ break;
+ }
+
+ /* add this fsync inode to the list */
+ entry = kmem_cache_alloc(fsync_entry_slab, GFP_F2FS_ZERO);
+ if (!entry) {
+ err = -ENOMEM;
+ break;
+ }
+ /*
+ * CP | dnode(F) | inode(DF)
+ * For this case, we should not give up now.
+ */
+ entry->inode = f2fs_iget(sbi->sb, ino_of_node(page));
+ if (IS_ERR(entry->inode)) {
+ err = PTR_ERR(entry->inode);
+ kmem_cache_free(fsync_entry_slab, entry);
+ if (err == -ENOENT) {
+ err = 0;
+ goto next;
+ }
+ break;
+ }
+ list_add_tail(&entry->list, head);
+ }
+ entry->blkaddr = blkaddr;
+
+ if (IS_INODE(page)) {
+ entry->last_inode = blkaddr;
+ if (is_dent_dnode(page))
+ entry->last_dentry = blkaddr;
+ }
+next:
+ /* check next segment */
+ blkaddr = next_blkaddr_of_node(page);
+ f2fs_put_page(page, 1);
+
+ 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) {
+ iput(entry->inode);
+ list_del(&entry->list);
+ kmem_cache_free(fsync_entry_slab, 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_WARM_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 = 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 = 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) {
+ /* Deallocate previous index in the node page */
+ inode = f2fs_iget(sbi->sb, ino);
+ if (IS_ERR(inode))
+ return PTR_ERR(inode);
+ } else {
+ inode = dn->inode;
+ }
+
+ bidx = start_bidx_of_node(offset, F2FS_I(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 (get_dnode_of_data(&tdn, bidx, LOOKUP_NODE))
+ goto out;
+
+ if (tdn.data_blkaddr == blkaddr)
+ 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.node_page, tdn.ofs_in_node) == blkaddr)
+ 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, block_t blkaddr)
+{
+ struct f2fs_inode_info *fi = F2FS_I(inode);
+ unsigned int start, end;
+ struct dnode_of_data dn;
+ struct f2fs_summary sum;
+ struct node_info ni;
+ int err = 0, recovered = 0;
+
+ /* step 1: recover xattr */
+ if (IS_INODE(page)) {
+ recover_inline_xattr(inode, page);
+ } else if (f2fs_has_xattr_block(ofs_of_node(page))) {
+ /*
+ * Deprecated; xattr blocks should be found from cold log.
+ * But, we should remain this for backward compatibility.
+ */
+ recover_xattr_data(inode, page, blkaddr);
+ goto out;
+ }
+
+ /* step 2: recover inline data */
+ if (recover_inline_data(inode, page))
+ goto out;
+
+ /* step 3: recover data indices */
+ start = start_bidx_of_node(ofs_of_node(page), fi);
+ end = start + ADDRS_PER_PAGE(page, fi);
+
+ f2fs_lock_op(sbi);
+
+ set_new_dnode(&dn, inode, NULL, NULL, 0);
+
+ err = get_dnode_of_data(&dn, start, ALLOC_NODE);
+ if (err) {
+ f2fs_unlock_op(sbi);
+ goto out;
+ }
+
+ f2fs_wait_on_page_writeback(dn.node_page, NODE);
+
+ get_node_info(sbi, dn.nid, &ni);
+ 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++) {
+ block_t src, dest;
+
+ src = datablock_addr(dn.node_page, dn.ofs_in_node);
+ dest = datablock_addr(page, dn.ofs_in_node);
+
+ if (src != dest && dest != NEW_ADDR && dest != NULL_ADDR &&
+ dest >= MAIN_BLKADDR(sbi) && dest < MAX_BLKADDR(sbi)) {
+
+ if (src == NULL_ADDR) {
+ err = reserve_new_block(&dn);
+ /* We should not get -ENOSPC */
+ f2fs_bug_on(sbi, err);
+ }
+
+ /* Check the previous node page having this index */
+ err = check_index_in_prev_nodes(sbi, dest, &dn);
+ if (err)
+ goto err;
+
+ set_summary(&sum, dn.nid, dn.ofs_in_node, ni.version);
+
+ /* write dummy data page */
+ recover_data_page(sbi, NULL, &sum, src, dest);
+ dn.data_blkaddr = dest;
+ set_data_blkaddr(&dn);
+ f2fs_update_extent_cache(&dn);
+ recovered++;
+ }
+ dn.ofs_in_node++;
+ }
+
+ if (IS_INODE(dn.node_page))
+ sync_inode_page(&dn);
+
+ 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);
+ f2fs_unlock_op(sbi);
+out:
+ f2fs_msg(sbi->sb, KERN_NOTICE,
+ "recover_data: ino = %lx, recovered = %d blocks, err = %d",
+ inode->i_ino, recovered, err);
+ return err;
+}
+
+static int recover_data(struct f2fs_sb_info *sbi,
+ struct list_head *head, int type)
+{
+ unsigned long long cp_ver = cur_cp_version(F2FS_CKPT(sbi));
+ 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, type);
+ blkaddr = NEXT_FREE_BLKADDR(sbi, curseg);
+
+ while (1) {
+ struct fsync_inode_entry *entry;
+
+ if (blkaddr < MAIN_BLKADDR(sbi) || blkaddr >= MAX_BLKADDR(sbi))
+ break;
+
+ ra_meta_pages_cond(sbi, blkaddr);
+
+ page = get_meta_page(sbi, blkaddr);
+
+ if (cp_ver != cpver_of_node(page)) {
+ f2fs_put_page(page, 1);
+ break;
+ }
+
+ entry = get_fsync_inode(head, 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 (entry->last_inode == blkaddr)
+ recover_inode(entry->inode, page);
+ if (entry->last_dentry == blkaddr) {
+ err = recover_dentry(entry->inode, page);
+ if (err) {
+ f2fs_put_page(page, 1);
+ break;
+ }
+ }
+ err = do_recover_data(sbi, entry->inode, page, blkaddr);
+ if (err) {
+ f2fs_put_page(page, 1);
+ break;
+ }
+
+ if (entry->blkaddr == blkaddr) {
+ iput(entry->inode);
+ list_del(&entry->list);
+ kmem_cache_free(fsync_entry_slab, entry);
+ }
+next:
+ /* check next segment */
+ blkaddr = next_blkaddr_of_node(page);
+ f2fs_put_page(page, 1);
+ }
+ if (!err)
+ allocate_new_segments(sbi);
+ return err;
+}
+
+int recover_fsync_data(struct f2fs_sb_info *sbi)
+{
+ struct curseg_info *curseg = CURSEG_I(sbi, CURSEG_WARM_NODE);
+ struct list_head inode_list;
+ block_t blkaddr;
+ int err;
+ bool need_writecp = false;
+
+ fsync_entry_slab = f2fs_kmem_cache_create("f2fs_fsync_inode_entry",
+ sizeof(struct fsync_inode_entry));
+ if (!fsync_entry_slab)
+ return -ENOMEM;
+
+ INIT_LIST_HEAD(&inode_list);
+
+ /* step #1: find fsynced inode numbers */
+ set_sbi_flag(sbi, SBI_POR_DOING);
+
+ /* prevent checkpoint */
+ mutex_lock(&sbi->cp_mutex);
+
+ blkaddr = NEXT_FREE_BLKADDR(sbi, curseg);
+
+ err = find_fsync_dnodes(sbi, &inode_list);
+ if (err)
+ goto out;
+
+ if (list_empty(&inode_list))
+ goto out;
+
+ need_writecp = true;
+
+ /* step #2: recover data */
+ err = recover_data(sbi, &inode_list, CURSEG_WARM_NODE);
+ if (!err)
+ f2fs_bug_on(sbi, !list_empty(&inode_list));
+out:
+ destroy_fsync_dnodes(&inode_list);
+ kmem_cache_destroy(fsync_entry_slab);
+
+ /* truncate meta pages to be used by the recovery */
+ truncate_inode_pages_range(META_MAPPING(sbi),
+ MAIN_BLKADDR(sbi) << PAGE_CACHE_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);
+ if (err) {
+ discard_next_dnode(sbi, blkaddr);
+
+ /* Flush all the NAT/SIT pages */
+ while (get_pages(sbi, F2FS_DIRTY_META))
+ sync_meta_pages(sbi, META, LONG_MAX);
+ set_ckpt_flags(sbi->ckpt, CP_ERROR_FLAG);
+ mutex_unlock(&sbi->cp_mutex);
+ } else if (need_writecp) {
+ struct cp_control cpc = {
+ .reason = CP_RECOVERY,
+ };
+ mutex_unlock(&sbi->cp_mutex);
+ write_checkpoint(sbi, &cpc);
+ } else {
+ mutex_unlock(&sbi->cp_mutex);
+ }
+ return err;
+}