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Date: Fri, 25 Jul 2014 17:34:04 -0700
From: "Darrick J. Wong" <darrick.wong@...cle.com>
To: tytso@....edu, darrick.wong@...cle.com
Cc: linux-ext4@...r.kernel.org
Subject: [PATCH 04/18] e2fsck: fix rule-violating lblk->pblk mappings on
bigalloc filesystems
As far as I can tell, logical block mappings on a bigalloc filesystem are
supposed to follow a few constraints:
* The logical cluster offset must match the physical cluster offset.
* A logical cluster may not map to multiple physical clusters.
Since the multiply-claimed block recovery code can be used to fix these
problems, teach e2fsck to find these transgressions and fix them.
Signed-off-by: Darrick J. Wong <darrick.wong@...cle.com>
---
e2fsck/pass1.c | 52 +++++++++++
e2fsck/pass1b.c | 42 ++++++++-
e2fsck/problem.c | 5 +
e2fsck/problem.h | 3 +
tests/f_badcluster/expect | 198 +++++++++++++++++++++++++++++++++++++++++++
tests/f_badcluster/image.gz | Bin
tests/f_badcluster/name | 2
tests/f_badcluster/script | 25 +++++
8 files changed, 320 insertions(+), 7 deletions(-)
create mode 100644 tests/f_badcluster/expect
create mode 100644 tests/f_badcluster/image.gz
create mode 100644 tests/f_badcluster/name
create mode 100644 tests/f_badcluster/script
diff --git a/e2fsck/pass1.c b/e2fsck/pass1.c
index a6552e5..646ef8a 100644
--- a/e2fsck/pass1.c
+++ b/e2fsck/pass1.c
@@ -1945,6 +1945,40 @@ void e2fsck_clear_inode(e2fsck_t ctx, ext2_ino_t ino,
e2fsck_write_inode(ctx, ino, inode, source);
}
+/*
+ * Use the multiple-blocks reclamation code to fix alignment problems in
+ * a bigalloc filesystem. We want a logical cluster to map to *only* one
+ * physical cluster, and we want the block offsets within that cluster to
+ * line up.
+ */
+static int has_unaligned_cluster_map(e2fsck_t ctx,
+ blk64_t last_pblk, e2_blkcnt_t last_lblk,
+ blk64_t pblk, blk64_t lblk)
+{
+ blk64_t cluster_mask;
+
+ if (!ctx->fs->cluster_ratio_bits)
+ return 0;
+ cluster_mask = EXT2FS_CLUSTER_MASK(ctx->fs);
+
+ /*
+ * If the block in the logical cluster doesn't align with the block in
+ * the physical cluster...
+ */
+ if ((lblk & cluster_mask) != (pblk & cluster_mask))
+ return 1;
+
+ /*
+ * If we cross a physical cluster boundary within a logical cluster...
+ */
+ if (last_pblk && (lblk & cluster_mask) != 0 &&
+ EXT2FS_B2C(ctx->fs, lblk) == EXT2FS_B2C(ctx->fs, last_lblk) &&
+ EXT2FS_B2C(ctx->fs, pblk) != EXT2FS_B2C(ctx->fs, last_pblk))
+ return 1;
+
+ return 0;
+}
+
static void scan_extent_node(e2fsck_t ctx, struct problem_context *pctx,
struct process_block_struct *pb,
blk64_t start_block, blk64_t end_block,
@@ -2249,7 +2283,16 @@ alloc_later:
mark_block_used(ctx, blk);
pb->num_blocks++;
}
-
+ if (has_unaligned_cluster_map(ctx, pb->previous_block,
+ pb->last_block, blk,
+ blockcnt)) {
+ pctx->blk = blockcnt;
+ pctx->blk2 = blk;
+ fix_problem(ctx, PR_1_MISALIGNED_CLUSTER, pctx);
+ mark_block_used(ctx, blk);
+ mark_block_used(ctx, blk);
+ }
+ pb->last_block = blockcnt;
pb->previous_block = blk;
if (is_dir) {
@@ -2815,6 +2858,13 @@ static int process_block(ext2_filsys fs,
((unsigned) blockcnt & EXT2FS_CLUSTER_MASK(ctx->fs)))) {
mark_block_used(ctx, blk);
p->num_blocks++;
+ } else if (has_unaligned_cluster_map(ctx, p->previous_block,
+ p->last_block, blk, blockcnt)) {
+ pctx->blk = blockcnt;
+ pctx->blk2 = blk;
+ fix_problem(ctx, PR_1_MISALIGNED_CLUSTER, pctx);
+ mark_block_used(ctx, blk);
+ mark_block_used(ctx, blk);
}
if (blockcnt >= 0)
p->last_block = blockcnt;
diff --git a/e2fsck/pass1b.c b/e2fsck/pass1b.c
index 8d42d10..c0bfa07 100644
--- a/e2fsck/pass1b.c
+++ b/e2fsck/pass1b.c
@@ -261,7 +261,7 @@ struct process_block_struct {
e2fsck_t ctx;
ext2_ino_t ino;
int dup_blocks;
- blk64_t cur_cluster;
+ blk64_t cur_cluster, phys_cluster;
blk64_t last_blk;
struct ext2_inode *inode;
struct problem_context *pctx;
@@ -317,6 +317,7 @@ static void pass1b(e2fsck_t ctx, char *block_buf)
pb.dup_blocks = 0;
pb.inode = &inode;
pb.cur_cluster = ~0;
+ pb.phys_cluster = ~0;
pb.last_blk = 0;
pb.pctx->blk = pb.pctx->blk2 = 0;
@@ -360,7 +361,7 @@ static int process_pass1b_block(ext2_filsys fs EXT2FS_ATTR((unused)),
{
struct process_block_struct *p;
e2fsck_t ctx;
- blk64_t lc;
+ blk64_t lc, pc;
problem_t op;
if (HOLE_BLKADDR(*block_nr))
@@ -368,6 +369,7 @@ static int process_pass1b_block(ext2_filsys fs EXT2FS_ATTR((unused)),
p = (struct process_block_struct *) priv_data;
ctx = p->ctx;
lc = EXT2FS_B2C(fs, blockcnt);
+ pc = EXT2FS_B2C(fs, *block_nr);
if (!ext2fs_test_block_bitmap2(ctx->block_dup_map, *block_nr))
goto finish;
@@ -389,11 +391,19 @@ static int process_pass1b_block(ext2_filsys fs EXT2FS_ATTR((unused)),
p->dup_blocks++;
ext2fs_mark_inode_bitmap2(inode_dup_map, p->ino);
- if (blockcnt < 0 || lc != p->cur_cluster)
+ /*
+ * Qualifications for submitting a block for duplicate processing:
+ * It's an extent/indirect block (and has a negative logical offset);
+ * we've crossed a logical cluster boundary; or the physical cluster
+ * suddenly changed, which indicates that blocks in a logical cluster
+ * are mapped to multiple physical clusters.
+ */
+ if (blockcnt < 0 || lc != p->cur_cluster || pc != p->phys_cluster)
add_dupe(ctx, p->ino, EXT2FS_B2C(fs, *block_nr), p->inode);
finish:
p->cur_cluster = lc;
+ p->phys_cluster = pc;
return 0;
}
@@ -563,7 +573,11 @@ static void pass1d(e2fsck_t ctx, char *block_buf)
pctx.dir = t->dir;
fix_problem(ctx, PR_1D_DUP_FILE_LIST, &pctx);
}
- if (file_ok) {
+ /*
+ * Even if the file shares blocks with itself, we still need to
+ * clone the blocks.
+ */
+ if (file_ok && (meta_data ? shared_len+1 : shared_len) != 0) {
fix_problem(ctx, PR_1D_DUP_BLOCKS_DEALT, &pctx);
continue;
}
@@ -706,9 +720,10 @@ struct clone_struct {
errcode_t errcode;
blk64_t dup_cluster;
blk64_t alloc_block;
- ext2_ino_t dir;
+ ext2_ino_t dir, ino;
char *buf;
e2fsck_t ctx;
+ struct ext2_inode *inode;
};
static int clone_file_block(ext2_filsys fs,
@@ -756,13 +771,26 @@ static int clone_file_block(ext2_filsys fs,
decrement_badcount(ctx, *block_nr, p);
cs->dup_cluster = c;
-
+ /*
+ * Let's try an implied cluster allocation. If we get the same
+ * cluster back, then we need to find a new block; otherwise,
+ * we're merely fixing the problem of one logical cluster being
+ * mapped to multiple physical clusters.
+ */
+ new_block = 0;
+ retval = ext2fs_map_cluster_block(fs, cs->ino, cs->inode,
+ blockcnt, &new_block);
+ if (retval == 0 && new_block != 0 &&
+ EXT2FS_B2C(ctx->fs, new_block) !=
+ EXT2FS_B2C(ctx->fs, *block_nr))
+ goto cluster_alloc_ok;
retval = ext2fs_new_block2(fs, 0, ctx->block_found_map,
&new_block);
if (retval) {
cs->errcode = retval;
return BLOCK_ABORT;
}
+cluster_alloc_ok:
cs->alloc_block = new_block;
got_block:
@@ -817,6 +845,8 @@ static errcode_t clone_file(e2fsck_t ctx, ext2_ino_t ino,
cs.dup_cluster = ~0;
cs.alloc_block = 0;
cs.ctx = ctx;
+ cs.ino = ino;
+ cs.inode = &dp->inode;
retval = ext2fs_get_mem(fs->blocksize, &cs.buf);
if (retval)
return retval;
diff --git a/e2fsck/problem.c b/e2fsck/problem.c
index 60c02af..4da8ba8 100644
--- a/e2fsck/problem.c
+++ b/e2fsck/problem.c
@@ -1048,6 +1048,11 @@ static struct e2fsck_problem problem_table[] = {
N_("@d @i %i has @x marked uninitialized at @b %c. "),
PROMPT_FIX, PR_PREEN_OK },
+ /* Inode logical block (physical block ) is misaligned. */
+ { PR_1_MISALIGNED_CLUSTER,
+ N_("@i %i logical @b %b (physical @b %c) violates cluster allocation rules.\nWill fix in pass 1B.\n"),
+ PROMPT_NONE, 0 },
+
/* Pass 1b errors */
/* Pass 1B: Rescan for duplicate/bad blocks */
diff --git a/e2fsck/problem.h b/e2fsck/problem.h
index 6cd3d50..80ef4a2 100644
--- a/e2fsck/problem.h
+++ b/e2fsck/problem.h
@@ -609,6 +609,9 @@ struct problem_context {
/* uninit directory block */
#define PR_1_UNINIT_DBLOCK 0x010073
+/* Inode logical block is misaligned */
+#define PR_1_MISALIGNED_CLUSTER 0x010074
+
/*
* Pass 1b errors
*/
diff --git a/tests/f_badcluster/expect b/tests/f_badcluster/expect
new file mode 100644
index 0000000..eb3bcf0
--- /dev/null
+++ b/tests/f_badcluster/expect
@@ -0,0 +1,198 @@
+Pass 1: Checking inodes, blocks, and sizes
+Inode 12 logical block 2 (physical block 1154) violates cluster allocation rules.
+Will fix in pass 1B.
+Inode 12, i_blocks is 32, should be 64. Fix? yes
+
+Inode 16 logical block 5 (physical block 1173) violates cluster allocation rules.
+Will fix in pass 1B.
+Inode 16, i_size is 3072, should be 6144. Fix? yes
+
+Inode 16, i_blocks is 32, should be 64. Fix? yes
+
+Inode 17 logical block 0 (physical block 1186) violates cluster allocation rules.
+Will fix in pass 1B.
+Inode 17 logical block 2 (physical block 1184) violates cluster allocation rules.
+Will fix in pass 1B.
+Inode 17, i_blocks is 32, should be 64. Fix? yes
+
+Inode 18 logical block 3 (physical block 1201) violates cluster allocation rules.
+Will fix in pass 1B.
+Inode 18, i_blocks is 32, should be 64. Fix? yes
+
+
+Running additional passes to resolve blocks claimed by more than one inode...
+Pass 1B: Rescanning for multiply-claimed blocks
+Multiply-claimed block(s) in inode 12: 1154
+Multiply-claimed block(s) in inode 13: 1152--1154
+Multiply-claimed block(s) in inode 14: 1648--1650
+Multiply-claimed block(s) in inode 15: 1650
+Multiply-claimed block(s) in inode 16: 1173
+Multiply-claimed block(s) in inode 17: 1186 1185 1184
+Multiply-claimed block(s) in inode 18: 1201
+Pass 1C: Scanning directories for inodes with multiply-claimed blocks
+Pass 1D: Reconciling multiply-claimed blocks
+(There are 7 inodes containing multiply-claimed blocks.)
+
+File /a (inode #12, mod time Tue Jun 17 08:00:50 2014)
+ has 1 multiply-claimed block(s), shared with 1 file(s):
+ /b (inode #13, mod time Tue Jun 17 08:00:50 2014)
+Clone multiply-claimed blocks? yes
+
+File /b (inode #13, mod time Tue Jun 17 08:00:50 2014)
+ has 1 multiply-claimed block(s), shared with 1 file(s):
+ /a (inode #12, mod time Tue Jun 17 08:00:50 2014)
+Multiply-claimed blocks already reassigned or cloned.
+
+File /c (inode #14, mod time Tue Jun 17 08:00:50 2014)
+ has 1 multiply-claimed block(s), shared with 1 file(s):
+ /d (inode #15, mod time Tue Jun 17 08:00:50 2014)
+Clone multiply-claimed blocks? yes
+
+File /d (inode #15, mod time Tue Jun 17 08:00:50 2014)
+ has 1 multiply-claimed block(s), shared with 1 file(s):
+ /c (inode #14, mod time Tue Jun 17 08:00:50 2014)
+Multiply-claimed blocks already reassigned or cloned.
+
+File /e (inode #16, mod time Tue Jun 17 08:00:50 2014)
+ has 1 multiply-claimed block(s), shared with 0 file(s):
+Clone multiply-claimed blocks? yes
+
+File /f (inode #17, mod time Tue Jun 17 08:00:50 2014)
+ has 1 multiply-claimed block(s), shared with 0 file(s):
+Clone multiply-claimed blocks? yes
+
+File /g (inode #18, mod time Tue Jun 17 08:00:50 2014)
+ has 1 multiply-claimed block(s), shared with 0 file(s):
+Clone multiply-claimed blocks? yes
+
+Pass 2: Checking directory structure
+Pass 3: Checking directory connectivity
+Pass 4: Checking reference counts
+Pass 5: Checking group summary information
+Free blocks count wrong for group #0 (50, counted=47).
+Fix? yes
+
+Free blocks count wrong (800, counted=752).
+Fix? yes
+
+
+test_fs: ***** FILE SYSTEM WAS MODIFIED *****
+test_fs: 18/128 files (22.2% non-contiguous), 1296/2048 blocks
+Pass 1: Checking inodes, blocks, and sizes
+Inode 12, i_blocks is 64, should be 32. Fix? yes
+
+Inode 16, i_blocks is 64, should be 32. Fix? yes
+
+Inode 17, i_blocks is 64, should be 32. Fix? yes
+
+Inode 18, i_blocks is 64, should be 32. Fix? yes
+
+Pass 2: Checking directory structure
+Pass 3: Checking directory connectivity
+Pass 4: Checking reference counts
+Pass 5: Checking group summary information
+Block bitmap differences: -(1168--1200)
+Fix? yes
+
+Free blocks count wrong for group #0 (47, counted=50).
+Fix? yes
+
+Free blocks count wrong (752, counted=800).
+Fix? yes
+
+
+test_fs: ***** FILE SYSTEM WAS MODIFIED *****
+test_fs: 18/128 files (5.6% non-contiguous), 1248/2048 blocks
+Pass 1: Checking inodes, blocks, and sizes
+Pass 2: Checking directory structure
+Pass 3: Checking directory connectivity
+Pass 4: Checking reference counts
+Pass 5: Checking group summary information
+test_fs: 18/128 files (5.6% non-contiguous), 1248/2048 blocks
+debugfs: stat /a
+Inode: 12 Type: regular Mode: 0644 Flags: 0x80000
+Generation: 1117152157 Version: 0x00000001
+User: 0 Group: 0 Size: 3072
+File ACL: 0 Directory ACL: 0
+Links: 1 Blockcount: 32
+Fragment: Address: 0 Number: 0 Size: 0
+ctime: 0x539ff5b2 -- Tue Jun 17 08:00:50 2014
+atime: 0x539ff5b2 -- Tue Jun 17 08:00:50 2014
+mtime: 0x539ff5b2 -- Tue Jun 17 08:00:50 2014
+EXTENTS:
+(0-1):1136-1137, (2):1138
+debugfs: stat /b
+Inode: 13 Type: regular Mode: 0644 Flags: 0x80000
+Generation: 1117152158 Version: 0x00000001
+User: 0 Group: 0 Size: 3072
+File ACL: 0 Directory ACL: 0
+Links: 1 Blockcount: 32
+Fragment: Address: 0 Number: 0 Size: 0
+ctime: 0x539ff5b2 -- Tue Jun 17 08:00:50 2014
+atime: 0x539ff5b2 -- Tue Jun 17 08:00:50 2014
+mtime: 0x539ff5b2 -- Tue Jun 17 08:00:50 2014
+EXTENTS:
+(0-2):1152-1154
+debugfs: stat /c
+Inode: 14 Type: regular Mode: 0644 Flags: 0x80000
+Generation: 1117152159 Version: 0x00000001
+User: 0 Group: 0 Size: 3072
+File ACL: 0 Directory ACL: 0
+Links: 1 Blockcount: 32
+Fragment: Address: 0 Number: 0 Size: 0
+ctime: 0x539ff5b2 -- Tue Jun 17 08:00:50 2014
+atime: 0x539ff5b2 -- Tue Jun 17 08:00:50 2014
+mtime: 0x539ff5b2 -- Tue Jun 17 08:00:50 2014
+EXTENTS:
+(0-1):1216-1217, (2):1218
+debugfs: stat /d
+Inode: 15 Type: regular Mode: 0644 Flags: 0x0
+Generation: 1117152160 Version: 0x00000001
+User: 0 Group: 0 Size: 3072
+File ACL: 0 Directory ACL: 0
+Links: 1 Blockcount: 32
+Fragment: Address: 0 Number: 0 Size: 0
+ctime: 0x539ff5b2 -- Tue Jun 17 08:00:50 2014
+atime: 0x539ff5b2 -- Tue Jun 17 08:00:50 2014
+mtime: 0x539ff5b2 -- Tue Jun 17 08:00:50 2014
+BLOCKS:
+(TIND):1650
+TOTAL: 1
+
+debugfs: stat /e
+Inode: 16 Type: regular Mode: 0644 Flags: 0x80000
+Generation: 1117152161 Version: 0x00000001
+User: 0 Group: 0 Size: 6144
+File ACL: 0 Directory ACL: 0
+Links: 1 Blockcount: 32
+Fragment: Address: 0 Number: 0 Size: 0
+ctime: 0x539ff5b2 -- Tue Jun 17 08:00:50 2014
+atime: 0x539ff5b2 -- Tue Jun 17 08:00:50 2014
+mtime: 0x539ff5b2 -- Tue Jun 17 08:00:50 2014
+EXTENTS:
+(0-2):1664-1666, (5):1669
+debugfs: stat /f
+Inode: 17 Type: regular Mode: 0644 Flags: 0x80000
+Generation: 1117152162 Version: 0x00000001
+User: 0 Group: 0 Size: 3072
+File ACL: 0 Directory ACL: 0
+Links: 1 Blockcount: 32
+Fragment: Address: 0 Number: 0 Size: 0
+ctime: 0x539ff5b2 -- Tue Jun 17 08:00:50 2014
+atime: 0x539ff5b2 -- Tue Jun 17 08:00:50 2014
+mtime: 0x539ff5b2 -- Tue Jun 17 08:00:50 2014
+EXTENTS:
+(0):1232, (1):1233, (2):1234
+debugfs: stat /g
+Inode: 18 Type: regular Mode: 0644 Flags: 0x80000
+Generation: 1117152163 Version: 0x00000001
+User: 0 Group: 0 Size: 3072
+File ACL: 0 Directory ACL: 0
+Links: 1 Blockcount: 32
+Fragment: Address: 0 Number: 0 Size: 0
+ctime: 0x539ff5b2 -- Tue Jun 17 08:00:50 2014
+atime: 0x539ff5b2 -- Tue Jun 17 08:00:50 2014
+mtime: 0x539ff5b2 -- Tue Jun 17 08:00:50 2014
+EXTENTS:
+(0-2):1680-1682, (3):1683
+debugfs:
\ No newline at end of file
diff --git a/tests/f_badcluster/image.gz b/tests/f_badcluster/image.gz
new file mode 100644
index 0000000000000000000000000000000000000000..e02ee1866868361e6e82bfbe29982365b2e3aa55
GIT binary patch
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diff --git a/tests/f_badcluster/name b/tests/f_badcluster/name
new file mode 100644
index 0000000..266f81c
--- /dev/null
+++ b/tests/f_badcluster/name
@@ -0,0 +1,2 @@
+test alignment problems with bigalloc clusters
+
diff --git a/tests/f_badcluster/script b/tests/f_badcluster/script
new file mode 100644
index 0000000..ba6b248
--- /dev/null
+++ b/tests/f_badcluster/script
@@ -0,0 +1,25 @@
+if test -x $DEBUGFS_EXE; then
+ IMAGE=$test_dir/../f_badcluster/image.gz
+ OUT=$test_name.log
+ EXP=$test_dir/expect
+ gzip -d < $IMAGE > $TMPFILE
+ ../misc/tune2fs -L test_fs $TMPFILE
+ ../e2fsck/e2fsck -fy $TMPFILE > $OUT
+ ../e2fsck/e2fsck -fy $TMPFILE >> $OUT
+ ../e2fsck/e2fsck -fy $TMPFILE >> $OUT
+ for i in a b c d e f g; do echo "stat /$i"; done | $DEBUGFS_EXE $TMPFILE >> $OUT
+
+ cmp -s $OUT $EXP
+ status=$?
+
+ if [ "$status" = 0 ]; then
+ echo "$test_name: $test_description: ok"
+ touch $test_name.ok
+ else
+ echo "$test_name: $test_description: failed"
+ diff $DIFF_OPTS $EXP $OUT > $test_name.failed
+ rm -f $test_name.tmp
+ fi
+else
+ echo "$test_name: skipped"
+fi
--
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