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-rw-r--r--fs/nilfs2/recovery.c260
1 files changed, 156 insertions, 104 deletions
diff --git a/fs/nilfs2/recovery.c b/fs/nilfs2/recovery.c
index ff00a0b7acb9..a9c61d0492cb 100644
--- a/fs/nilfs2/recovery.c
+++ b/fs/nilfs2/recovery.c
@@ -1,23 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0+
/*
- * recovery.c - NILFS recovery logic
+ * NILFS recovery logic
*
* Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- *
- * Written by Ryusuke Konishi <ryusuke@osrg.net>
+ * Written by Ryusuke Konishi.
*/
#include <linux/buffer_head.h>
@@ -47,8 +34,10 @@ enum {
/* work structure for recovery */
struct nilfs_recovery_block {
- ino_t ino; /* Inode number of the file that this block
- belongs to */
+ ino_t ino; /*
+ * Inode number of the file that this block
+ * belongs to
+ */
sector_t blocknr; /* block number */
__u64 vblocknr; /* virtual block number */
unsigned long blkoff; /* File offset of the data block (per block) */
@@ -56,38 +45,37 @@ struct nilfs_recovery_block {
};
-static int nilfs_warn_segment_error(int err)
+static int nilfs_warn_segment_error(struct super_block *sb, int err)
{
+ const char *msg = NULL;
+
switch (err) {
case NILFS_SEG_FAIL_IO:
- printk(KERN_WARNING
- "NILFS warning: I/O error on loading last segment\n");
+ nilfs_err(sb, "I/O error reading segment");
return -EIO;
case NILFS_SEG_FAIL_MAGIC:
- printk(KERN_WARNING
- "NILFS warning: Segment magic number invalid\n");
+ msg = "Magic number mismatch";
break;
case NILFS_SEG_FAIL_SEQ:
- printk(KERN_WARNING
- "NILFS warning: Sequence number mismatch\n");
+ msg = "Sequence number mismatch";
break;
case NILFS_SEG_FAIL_CHECKSUM_SUPER_ROOT:
- printk(KERN_WARNING
- "NILFS warning: Checksum error in super root\n");
+ msg = "Checksum error in super root";
break;
case NILFS_SEG_FAIL_CHECKSUM_FULL:
- printk(KERN_WARNING
- "NILFS warning: Checksum error in segment payload\n");
+ msg = "Checksum error in segment payload";
break;
case NILFS_SEG_FAIL_CONSISTENCY:
- printk(KERN_WARNING
- "NILFS warning: Inconsistent segment\n");
+ msg = "Inconsistency found";
break;
case NILFS_SEG_NO_SUPER_ROOT:
- printk(KERN_WARNING
- "NILFS warning: No super root in the last segment\n");
+ msg = "No super root in the last segment";
break;
+ default:
+ nilfs_err(sb, "unrecognized segment error %d", err);
+ return -EINVAL;
}
+ nilfs_warn(sb, "invalid segment: %s", msg);
return -EINVAL;
}
@@ -100,6 +88,8 @@ static int nilfs_warn_segment_error(int err)
* @check_bytes: number of bytes to be checked
* @start: DBN of start block
* @nblock: number of blocks to be checked
+ *
+ * Return: 0 on success, or %-EIO if an I/O error occurs.
*/
static int nilfs_compute_checksum(struct the_nilfs *nilfs,
struct buffer_head *bhs, u32 *sum,
@@ -138,6 +128,11 @@ static int nilfs_compute_checksum(struct the_nilfs *nilfs,
* @sr_block: disk block number of the super root block
* @pbh: address of a buffer_head pointer to return super root buffer
* @check: CRC check flag
+ *
+ * Return: 0 on success, or one of the following negative error codes on
+ * failure:
+ * * %-EINVAL - Super root block corrupted.
+ * * %-EIO - I/O error.
*/
int nilfs_read_super_root_block(struct the_nilfs *nilfs, sector_t sr_block,
struct buffer_head **pbh, int check)
@@ -156,7 +151,7 @@ int nilfs_read_super_root_block(struct the_nilfs *nilfs, sector_t sr_block,
sr = (struct nilfs_super_root *)bh_sr->b_data;
if (check) {
- unsigned bytes = le16_to_cpu(sr->sr_bytes);
+ unsigned int bytes = le16_to_cpu(sr->sr_bytes);
if (bytes == 0 || bytes > nilfs->ns_blocksize) {
ret = NILFS_SEG_FAIL_CHECKSUM_SUPER_ROOT;
@@ -180,7 +175,7 @@ int nilfs_read_super_root_block(struct the_nilfs *nilfs, sector_t sr_block,
brelse(bh_sr);
failed:
- return nilfs_warn_segment_error(ret);
+ return nilfs_warn_segment_error(nilfs->ns_sb, ret);
}
/**
@@ -188,6 +183,8 @@ int nilfs_read_super_root_block(struct the_nilfs *nilfs, sector_t sr_block,
* @nilfs: nilfs object
* @start_blocknr: start block number of the log
* @sum: pointer to return segment summary structure
+ *
+ * Return: Buffer head pointer, or NULL if an I/O error occurs.
*/
static struct buffer_head *
nilfs_read_log_header(struct the_nilfs *nilfs, sector_t start_blocknr,
@@ -207,6 +204,13 @@ nilfs_read_log_header(struct the_nilfs *nilfs, sector_t start_blocknr,
* @seg_seq: sequence number of segment
* @bh_sum: buffer head of summary block
* @sum: segment summary struct
+ *
+ * Return: 0 on success, or one of the following internal codes on failure:
+ * * %NILFS_SEG_FAIL_MAGIC - Magic number mismatch.
+ * * %NILFS_SEG_FAIL_SEQ - Sequence number mismatch.
+ * * %NIFLS_SEG_FAIL_CONSISTENCY - Block count out of range.
+ * * %NILFS_SEG_FAIL_IO - I/O error.
+ * * %NILFS_SEG_FAIL_CHECKSUM_FULL - Full log checksum verification failed.
*/
static int nilfs_validate_log(struct the_nilfs *nilfs, u64 seg_seq,
struct buffer_head *bh_sum,
@@ -250,6 +254,9 @@ out:
* @pbh: the current buffer head on summary blocks [in, out]
* @offset: the current byte offset on summary blocks [in, out]
* @bytes: byte size of the item to be read
+ *
+ * Return: Kernel space address of current segment summary entry, or
+ * NULL if an I/O error occurs.
*/
static void *nilfs_read_summary_info(struct the_nilfs *nilfs,
struct buffer_head **pbh,
@@ -312,6 +319,11 @@ static void nilfs_skip_summary_info(struct the_nilfs *nilfs,
* @start_blocknr: start block number of the log
* @sum: log summary information
* @head: list head to add nilfs_recovery_block struct
+ *
+ * Return: 0 on success, or one of the following negative error codes on
+ * failure:
+ * * %-EIO - I/O error.
+ * * %-ENOMEM - Insufficient memory available.
*/
static int nilfs_scan_dsync_log(struct the_nilfs *nilfs, sector_t start_blocknr,
struct nilfs_segment_summary *sum,
@@ -445,8 +457,17 @@ static int nilfs_prepare_segment_for_recovery(struct the_nilfs *nilfs,
* The next segment is invalidated by this recovery.
*/
err = nilfs_sufile_free(sufile, segnum[1]);
- if (unlikely(err))
+ if (unlikely(err)) {
+ if (err == -ENOENT) {
+ nilfs_err(sb,
+ "checkpoint log inconsistency at block %llu (segment %llu): next segment %llu is unallocated",
+ (unsigned long long)nilfs->ns_last_pseg,
+ (unsigned long long)nilfs->ns_segnum,
+ (unsigned long long)segnum[1]);
+ err = -EINVAL;
+ }
goto failed;
+ }
for (i = 1; i < 4; i++) {
err = nilfs_segment_list_add(head, segnum[i]);
@@ -484,18 +505,16 @@ static int nilfs_prepare_segment_for_recovery(struct the_nilfs *nilfs,
static int nilfs_recovery_copy_block(struct the_nilfs *nilfs,
struct nilfs_recovery_block *rb,
- struct page *page)
+ loff_t pos, struct folio *folio)
{
struct buffer_head *bh_org;
- void *kaddr;
+ size_t from = offset_in_folio(folio, pos);
bh_org = __bread(nilfs->ns_bdev, rb->blocknr, nilfs->ns_blocksize);
if (unlikely(!bh_org))
return -EIO;
- kaddr = kmap_atomic(page);
- memcpy(kaddr + bh_offset(bh_org), bh_org->b_data, bh_org->b_size);
- kunmap_atomic(kaddr);
+ memcpy_to_folio(folio, from, bh_org->b_data, bh_org->b_size);
brelse(bh_org);
return 0;
}
@@ -508,8 +527,8 @@ static int nilfs_recover_dsync_blocks(struct the_nilfs *nilfs,
{
struct inode *inode;
struct nilfs_recovery_block *rb, *n;
- unsigned blocksize = nilfs->ns_blocksize;
- struct page *page;
+ unsigned int blocksize = nilfs->ns_blocksize;
+ struct folio *folio;
loff_t pos;
int err = 0, err2 = 0;
@@ -523,42 +542,41 @@ static int nilfs_recover_dsync_blocks(struct the_nilfs *nilfs,
pos = rb->blkoff << inode->i_blkbits;
err = block_write_begin(inode->i_mapping, pos, blocksize,
- 0, &page, nilfs_get_block);
+ &folio, nilfs_get_block);
if (unlikely(err)) {
loff_t isize = inode->i_size;
+
if (pos + blocksize > isize)
nilfs_write_failed(inode->i_mapping,
pos + blocksize);
goto failed_inode;
}
- err = nilfs_recovery_copy_block(nilfs, rb, page);
+ err = nilfs_recovery_copy_block(nilfs, rb, pos, folio);
if (unlikely(err))
- goto failed_page;
+ goto failed_folio;
err = nilfs_set_file_dirty(inode, 1);
if (unlikely(err))
- goto failed_page;
+ goto failed_folio;
- block_write_end(NULL, inode->i_mapping, pos, blocksize,
- blocksize, page, NULL);
+ block_write_end(pos, blocksize, blocksize, folio);
- unlock_page(page);
- page_cache_release(page);
+ folio_unlock(folio);
+ folio_put(folio);
(*nr_salvaged_blocks)++;
goto next;
- failed_page:
- unlock_page(page);
- page_cache_release(page);
+ failed_folio:
+ folio_unlock(folio);
+ folio_put(folio);
failed_inode:
- printk(KERN_WARNING
- "NILFS warning: error recovering data block "
- "(err=%d, ino=%lu, block-offset=%llu)\n",
- err, (unsigned long)rb->ino,
- (unsigned long long)rb->blkoff);
+ nilfs_warn(sb,
+ "error %d recovering data block (ino=%lu, block-offset=%llu)",
+ err, (unsigned long)rb->ino,
+ (unsigned long long)rb->blkoff);
if (!err2)
err2 = err;
next:
@@ -574,7 +592,14 @@ static int nilfs_recover_dsync_blocks(struct the_nilfs *nilfs,
* checkpoint
* @nilfs: nilfs object
* @sb: super block instance
+ * @root: NILFS root instance
* @ri: pointer to a nilfs_recovery_info
+ *
+ * Return: 0 on success, or one of the following negative error codes on
+ * failure:
+ * * %-EINVAL - Log format error.
+ * * %-EIO - I/O error.
+ * * %-ENOMEM - Insufficient memory available.
*/
static int nilfs_do_roll_forward(struct the_nilfs *nilfs,
struct super_block *sb,
@@ -582,7 +607,7 @@ static int nilfs_do_roll_forward(struct the_nilfs *nilfs,
struct nilfs_recovery_info *ri)
{
struct buffer_head *bh_sum = NULL;
- struct nilfs_segment_summary *sum;
+ struct nilfs_segment_summary *sum = NULL;
sector_t pseg_start;
sector_t seg_start, seg_end; /* Starting/ending DBN of full segment */
unsigned long nsalvaged_blocks = 0;
@@ -638,7 +663,7 @@ static int nilfs_do_roll_forward(struct the_nilfs *nilfs,
!(flags & NILFS_SS_SYNDT))
goto try_next_pseg;
state = RF_DSYNC_ST;
- /* Fall through */
+ fallthrough;
case RF_DSYNC_ST:
if (!(flags & NILFS_SS_SYNDT))
goto confused;
@@ -681,8 +706,7 @@ static int nilfs_do_roll_forward(struct the_nilfs *nilfs,
}
if (nsalvaged_blocks) {
- printk(KERN_INFO "NILFS (device %s): salvaged %lu blocks\n",
- sb->s_id, nsalvaged_blocks);
+ nilfs_info(sb, "salvaged %lu blocks", nsalvaged_blocks);
ri->ri_need_recovery = NILFS_RECOVERY_ROLLFORWARD_DONE;
}
out:
@@ -693,10 +717,9 @@ static int nilfs_do_roll_forward(struct the_nilfs *nilfs,
confused:
err = -EINVAL;
failed:
- printk(KERN_ERR
- "NILFS (device %s): Error roll-forwarding "
- "(err=%d, pseg block=%llu). ",
- sb->s_id, err, (unsigned long long)pseg_start);
+ nilfs_err(sb,
+ "error %d roll-forwarding partial segment at blocknr = %llu",
+ err, (unsigned long long)pseg_start);
goto out;
}
@@ -711,35 +734,62 @@ static void nilfs_finish_roll_forward(struct the_nilfs *nilfs,
return;
bh = __getblk(nilfs->ns_bdev, ri->ri_lsegs_start, nilfs->ns_blocksize);
- BUG_ON(!bh);
+ if (WARN_ON(!bh))
+ return; /* should never happen */
+
+ lock_buffer(bh);
memset(bh->b_data, 0, bh->b_size);
+ set_buffer_uptodate(bh);
set_buffer_dirty(bh);
+ unlock_buffer(bh);
+
err = sync_dirty_buffer(bh);
if (unlikely(err))
- printk(KERN_WARNING
- "NILFS warning: buffer sync write failed during "
- "post-cleaning of recovery.\n");
+ nilfs_warn(nilfs->ns_sb,
+ "buffer sync write failed during post-cleaning of recovery.");
brelse(bh);
}
/**
+ * nilfs_abort_roll_forward - cleaning up after a failed rollforward recovery
+ * @nilfs: nilfs object
+ */
+static void nilfs_abort_roll_forward(struct the_nilfs *nilfs)
+{
+ struct nilfs_inode_info *ii, *n;
+ LIST_HEAD(head);
+
+ /* Abandon inodes that have read recovery data */
+ spin_lock(&nilfs->ns_inode_lock);
+ list_splice_init(&nilfs->ns_dirty_files, &head);
+ spin_unlock(&nilfs->ns_inode_lock);
+ if (list_empty(&head))
+ return;
+
+ set_nilfs_purging(nilfs);
+ list_for_each_entry_safe(ii, n, &head, i_dirty) {
+ spin_lock(&nilfs->ns_inode_lock);
+ list_del_init(&ii->i_dirty);
+ spin_unlock(&nilfs->ns_inode_lock);
+
+ iput(&ii->vfs_inode);
+ }
+ clear_nilfs_purging(nilfs);
+}
+
+/**
* nilfs_salvage_orphan_logs - salvage logs written after the latest checkpoint
* @nilfs: nilfs object
* @sb: super block instance
* @ri: pointer to a nilfs_recovery_info struct to store search results.
*
- * Return Value: On success, 0 is returned. On error, one of the following
- * negative error code is returned.
- *
- * %-EINVAL - Inconsistent filesystem state.
- *
- * %-EIO - I/O error
- *
- * %-ENOSPC - No space left on device (only in a panic state).
- *
- * %-ERESTARTSYS - Interrupted.
- *
- * %-ENOMEM - Insufficient memory available.
+ * Return: 0 on success, or one of the following negative error codes on
+ * failure:
+ * * %-EINVAL - Inconsistent filesystem state.
+ * * %-EIO - I/O error.
+ * * %-ENOMEM - Insufficient memory available.
+ * * %-ENOSPC - No space left on device (only in a panic state).
+ * * %-ERESTARTSYS - Interrupted.
*/
int nilfs_salvage_orphan_logs(struct the_nilfs *nilfs,
struct super_block *sb,
@@ -753,8 +803,7 @@ int nilfs_salvage_orphan_logs(struct the_nilfs *nilfs,
err = nilfs_attach_checkpoint(sb, ri->ri_cno, true, &root);
if (unlikely(err)) {
- printk(KERN_ERR
- "NILFS: error loading the latest checkpoint.\n");
+ nilfs_err(sb, "error %d loading the latest checkpoint", err);
return err;
}
@@ -765,8 +814,8 @@ int nilfs_salvage_orphan_logs(struct the_nilfs *nilfs,
if (ri->ri_need_recovery == NILFS_RECOVERY_ROLLFORWARD_DONE) {
err = nilfs_prepare_segment_for_recovery(nilfs, sb, ri);
if (unlikely(err)) {
- printk(KERN_ERR "NILFS: Error preparing segments for "
- "recovery.\n");
+ nilfs_err(sb, "error %d preparing segment for recovery",
+ err);
goto failed;
}
@@ -779,17 +828,21 @@ int nilfs_salvage_orphan_logs(struct the_nilfs *nilfs,
nilfs_detach_log_writer(sb);
if (unlikely(err)) {
- printk(KERN_ERR "NILFS: Oops! recovery failed. "
- "(err=%d)\n", err);
- goto failed;
+ nilfs_err(sb, "error %d writing segment for recovery",
+ err);
+ goto put_root;
}
nilfs_finish_roll_forward(nilfs, ri);
}
- failed:
+put_root:
nilfs_put_root(root);
return err;
+
+failed:
+ nilfs_abort_roll_forward(nilfs);
+ goto put_root;
}
/**
@@ -801,20 +854,17 @@ int nilfs_salvage_orphan_logs(struct the_nilfs *nilfs,
* segment pointed by the superblock. It sets up struct the_nilfs through
* this search. It fills nilfs_recovery_info (ri) required for recovery.
*
- * Return Value: On success, 0 is returned. On error, one of the following
- * negative error code is returned.
- *
- * %-EINVAL - No valid segment found
- *
- * %-EIO - I/O error
- *
- * %-ENOMEM - Insufficient memory available.
+ * Return: 0 on success, or one of the following negative error codes on
+ * failure:
+ * * %-EINVAL - No valid segment found.
+ * * %-EIO - I/O error.
+ * * %-ENOMEM - Insufficient memory available.
*/
int nilfs_search_super_root(struct the_nilfs *nilfs,
struct nilfs_recovery_info *ri)
{
struct buffer_head *bh_sum = NULL;
- struct nilfs_segment_summary *sum;
+ struct nilfs_segment_summary *sum = NULL;
sector_t pseg_start, pseg_end, sr_pseg_start = 0;
sector_t seg_start, seg_end; /* range of full segment (block number) */
sector_t b, end;
@@ -872,9 +922,11 @@ int nilfs_search_super_root(struct the_nilfs *nilfs,
flags = le16_to_cpu(sum->ss_flags);
if (!(flags & NILFS_SS_SR) && !scan_newer) {
- /* This will never happen because a superblock
- (last_segment) always points to a pseg
- having a super root. */
+ /*
+ * This will never happen because a superblock
+ * (last_segment) always points to a pseg with
+ * a super root.
+ */
ret = NILFS_SEG_FAIL_CONSISTENCY;
goto failed;
}
@@ -960,5 +1012,5 @@ int nilfs_search_super_root(struct the_nilfs *nilfs,
failed:
brelse(bh_sum);
nilfs_dispose_segment_list(&segments);
- return (ret < 0) ? ret : nilfs_warn_segment_error(ret);
+ return ret < 0 ? ret : nilfs_warn_segment_error(nilfs->ns_sb, ret);
}
generated by cgit (git 2.34.1) at 2025-12-25 12:12:43 +0000