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Message-Id: <E1SWe75-0007rd-TQ@tytso-glaptop.cam.corp.google.com>
Date: Mon, 21 May 2012 21:42:15 -0400
From: "Theodore Ts'o" <tytso@....edu>
To: linux-ext4@...r.kernel.org
Subject: [PATCH] e2fsck: fix 64-bit journal support
I just found what a somewhat disturbing bug which is still present in
1.42.3 --- namely, that the journal replay code in e2fsck was not
properly handling 64-bit file systems correctly, by dropping the high
bits of the block number from the jbd2 descriptor blocks.
I have not had a chance to fully test to make sure we don't have other
bugs hiding in the 64-bit code, but it's clear no one else has had a lot
of time to test it either -- at least not to the extent of doing power
fail testing of > 16TB file systems! :-(
- Ted
>From 3b693d0b03569795d04920a04a0a21e5f64ffedc Mon Sep 17 00:00:00 2001
From: Theodore Ts'o <tytso@....edu>
Date: Mon, 21 May 2012 21:30:45 -0400
Subject: [PATCH] e2fsck: fix 64-bit journal support
64-bit journal support was broken; we weren't using the high bits from
the journal descriptor blocks! We were also using "unsigned long" for
the journal block numbers, which would be a problem on 32-bit systems.
Signed-off-by: "Theodore Ts'o" <tytso@....edu>
---
e2fsck/jfs_user.h | 4 ++--
e2fsck/journal.c | 33 +++++++++++++++++----------------
e2fsck/recovery.c | 25 ++++++++++++-------------
3 files changed, 31 insertions(+), 31 deletions(-)
diff --git a/e2fsck/jfs_user.h b/e2fsck/jfs_user.h
index 9e33306..92f8ae2 100644
--- a/e2fsck/jfs_user.h
+++ b/e2fsck/jfs_user.h
@@ -18,7 +18,7 @@ struct buffer_head {
e2fsck_t b_ctx;
io_channel b_io;
int b_size;
- blk_t b_blocknr;
+ unsigned long long b_blocknr;
int b_dirty;
int b_uptodate;
int b_err;
@@ -121,7 +121,7 @@ _INLINE_ size_t journal_tag_bytes(journal_t *journal)
/*
* Kernel compatibility functions are defined in journal.c
*/
-int journal_bmap(journal_t *journal, blk64_t block, unsigned long *phys);
+int journal_bmap(journal_t *journal, blk64_t block, unsigned long long *phys);
struct buffer_head *getblk(kdev_t ctx, blk64_t blocknr, int blocksize);
void sync_blockdev(kdev_t kdev);
void ll_rw_block(int rw, int dummy, struct buffer_head *bh[]);
diff --git a/e2fsck/journal.c b/e2fsck/journal.c
index 915b8bb..bada028 100644
--- a/e2fsck/journal.c
+++ b/e2fsck/journal.c
@@ -44,7 +44,7 @@ static int bh_count = 0;
* to use the recovery.c file virtually unchanged from the kernel, so we
* don't have to do much to keep kernel and user recovery in sync.
*/
-int journal_bmap(journal_t *journal, blk64_t block, unsigned long *phys)
+int journal_bmap(journal_t *journal, blk64_t block, unsigned long long *phys)
{
#ifdef USE_INODE_IO
*phys = block;
@@ -80,8 +80,8 @@ struct buffer_head *getblk(kdev_t kdev, blk64_t blocknr, int blocksize)
if (journal_enable_debug >= 3)
bh_count++;
#endif
- jfs_debug(4, "getblk for block %lu (%d bytes)(total %d)\n",
- (unsigned long) blocknr, blocksize, bh_count);
+ jfs_debug(4, "getblk for block %llu (%d bytes)(total %d)\n",
+ (unsigned long long) blocknr, blocksize, bh_count);
bh->b_ctx = kdev->k_ctx;
if (kdev->k_dev == K_DEV_FS)
@@ -114,38 +114,39 @@ void ll_rw_block(int rw, int nr, struct buffer_head *bhp[])
for (; nr > 0; --nr) {
bh = *bhp++;
if (rw == READ && !bh->b_uptodate) {
- jfs_debug(3, "reading block %lu/%p\n",
- (unsigned long) bh->b_blocknr, (void *) bh);
+ jfs_debug(3, "reading block %llu/%p\n",
+ bh->b_blocknr, (void *) bh);
retval = io_channel_read_blk64(bh->b_io,
bh->b_blocknr,
1, bh->b_data);
if (retval) {
com_err(bh->b_ctx->device_name, retval,
- "while reading block %lu\n",
- (unsigned long) bh->b_blocknr);
+ "while reading block %llu\n",
+ bh->b_blocknr);
bh->b_err = retval;
continue;
}
bh->b_uptodate = 1;
} else if (rw == WRITE && bh->b_dirty) {
- jfs_debug(3, "writing block %lu/%p\n",
- (unsigned long) bh->b_blocknr, (void *) bh);
+ jfs_debug(3, "writing block %llu/%p\n",
+ bh->b_blocknr,
+ (void *) bh);
retval = io_channel_write_blk64(bh->b_io,
bh->b_blocknr,
1, bh->b_data);
if (retval) {
com_err(bh->b_ctx->device_name, retval,
- "while writing block %lu\n",
- (unsigned long) bh->b_blocknr);
+ "while writing block %llu\n",
+ bh->b_blocknr);
bh->b_err = retval;
continue;
}
bh->b_dirty = 0;
bh->b_uptodate = 1;
} else {
- jfs_debug(3, "no-op %s for block %lu\n",
+ jfs_debug(3, "no-op %s for block %llu\n",
rw == READ ? "read" : "write",
- (unsigned long) bh->b_blocknr);
+ bh->b_blocknr);
}
}
}
@@ -164,8 +165,8 @@ void brelse(struct buffer_head *bh)
{
if (bh->b_dirty)
ll_rw_block(WRITE, 1, &bh);
- jfs_debug(3, "freeing block %lu/%p (total %d)\n",
- (unsigned long) bh->b_blocknr, (void *) bh, --bh_count);
+ jfs_debug(3, "freeing block %llu/%p (total %d)\n",
+ bh->b_blocknr, (void *) bh, --bh_count);
ext2fs_free_mem(&bh);
}
@@ -237,7 +238,7 @@ static errcode_t e2fsck_get_journal(e2fsck_t ctx, journal_t **ret_journal)
journal_t *journal = NULL;
errcode_t retval = 0;
io_manager io_ptr = 0;
- unsigned long start = 0;
+ unsigned long long start = 0;
int ext_journal = 0;
int tried_backup_jnl = 0;
diff --git a/e2fsck/recovery.c b/e2fsck/recovery.c
index b669941..e94ef4e 100644
--- a/e2fsck/recovery.c
+++ b/e2fsck/recovery.c
@@ -71,7 +71,7 @@ static int do_readahead(journal_t *journal, unsigned int start)
{
int err;
unsigned int max, nbufs, next;
- unsigned long blocknr;
+ unsigned long long blocknr;
struct buffer_head *bh;
struct buffer_head * bufs[MAXBUF];
@@ -133,7 +133,7 @@ static int jread(struct buffer_head **bhp, journal_t *journal,
unsigned int offset)
{
int err;
- unsigned long blocknr;
+ unsigned long long blocknr;
struct buffer_head *bh;
*bhp = NULL;
@@ -309,7 +309,6 @@ int journal_skip_recovery(journal_t *journal)
return err;
}
-#if 0
static inline unsigned long long read_tag_block(int tag_bytes, journal_block_tag_t *tag)
{
unsigned long long block = be32_to_cpu(tag->t_blocknr);
@@ -317,17 +316,16 @@ static inline unsigned long long read_tag_block(int tag_bytes, journal_block_tag
block |= (__u64)be32_to_cpu(tag->t_blocknr_high) << 32;
return block;
}
-#endif
/*
* calc_chksums calculates the checksums for the blocks described in the
* descriptor block.
*/
static int calc_chksums(journal_t *journal, struct buffer_head *bh,
- unsigned long *next_log_block, __u32 *crc32_sum)
+ unsigned long long *next_log_block, __u32 *crc32_sum)
{
int i, num_blks, err;
- unsigned long io_block;
+ unsigned long long io_block;
struct buffer_head *obh;
num_blks = count_tags(journal, bh);
@@ -340,7 +338,7 @@ static int calc_chksums(journal_t *journal, struct buffer_head *bh,
err = jread(&obh, journal, io_block);
if (err) {
printk(KERN_ERR "JBD: IO error %d recovering block "
- "%lu in log\n", err, io_block);
+ "%llu in log\n", err, io_block);
return 1;
} else {
*crc32_sum = crc32_be(*crc32_sum, (void *)obh->b_data,
@@ -355,7 +353,7 @@ static int do_one_pass(journal_t *journal,
struct recovery_info *info, enum passtype pass)
{
unsigned int first_commit_ID, next_commit_ID;
- unsigned long next_log_block;
+ unsigned long long next_log_block;
int err, success = 0;
journal_superblock_t * sb;
journal_header_t * tmp;
@@ -485,7 +483,7 @@ static int do_one_pass(journal_t *journal,
tagp = &bh->b_data[sizeof(journal_header_t)];
while ((tagp - bh->b_data + tag_bytes)
<= journal->j_blocksize) {
- unsigned long io_block;
+ unsigned long long io_block;
tag = (journal_block_tag_t *) tagp;
flags = be32_to_cpu(tag->t_flags);
@@ -499,13 +497,14 @@ static int do_one_pass(journal_t *journal,
success = err;
printk (KERN_ERR
"JBD: IO error %d recovering "
- "block %ld in log\n",
+ "block %llu in log\n",
err, io_block);
} else {
- unsigned long blocknr;
+ unsigned long long blocknr;
J_ASSERT(obh != NULL);
- blocknr = be32_to_cpu(tag->t_blocknr);
+ blocknr = read_tag_block(tag_bytes,
+ tag);
/* If the block has been
* revoked, then we're all done
@@ -733,7 +732,7 @@ static int scan_revoke_records(journal_t *journal, struct buffer_head *bh,
record_len = 8;
while (offset < max) {
- unsigned long blocknr;
+ unsigned long long blocknr;
int err;
if (record_len == 4)
--
1.7.10.rc3
--
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