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e2fsck: fix handling of duplicate blocks with bigalloc file systems

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We need to do an accounting of duplicate clusters on a per-cluster
instead of a per-block basis so we know when we've correctly accounted
for all of the multiply claimed blocks in a particular inode.

Thanks to Robin Dong for reporting this bug.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Theodore Ts'o 2011-11-28 11:00:48 -05:00
parent 2f7d855c63
commit b23f2f4de0
1 changed files with 24 additions and 31 deletions
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51
e2fsck/pass1b.c
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@ -259,6 +259,7 @@ struct process_block_struct {
e2fsck_t ctx;
ext2_ino_t ino;
int dup_blocks;
blk64_t cur_cluster;
struct ext2_inode *inode;
struct problem_context *pctx;
};
@ -310,6 +311,7 @@ static void pass1b(e2fsck_t ctx, char *block_buf)
pb.ino = ino;
pb.dup_blocks = 0;
pb.inode = &inode;
pb.cur_cluster = ~0;
if (ext2fs_inode_has_valid_blocks2(fs, &inode) ||
(ino == EXT2_BAD_INO))
@ -339,21 +341,23 @@ static void pass1b(e2fsck_t ctx, char *block_buf)
static int process_pass1b_block(ext2_filsys fs EXT2FS_ATTR((unused)),
blk64_t *block_nr,
e2_blkcnt_t blockcnt EXT2FS_ATTR((unused)),
e2_blkcnt_t blockcnt,
blk64_t ref_blk EXT2FS_ATTR((unused)),
int ref_offset EXT2FS_ATTR((unused)),
void *priv_data)
{
struct process_block_struct *p;
e2fsck_t ctx;
blk64_t lc;
if (HOLE_BLKADDR(*block_nr))
return 0;
p = (struct process_block_struct *) priv_data;
ctx = p->ctx;
lc = EXT2FS_B2C(fs, blockcnt);
if (!ext2fs_test_block_bitmap2(ctx->block_dup_map, *block_nr))
return 0;
goto finish;
/* OK, this is a duplicate block */
if (p->ino != EXT2_BAD_INO) {
@ -363,8 +367,11 @@ static int process_pass1b_block(ext2_filsys fs EXT2FS_ATTR((unused)),
p->dup_blocks++;
ext2fs_mark_inode_bitmap2(inode_dup_map, p->ino);
if (lc != p->cur_cluster)
add_dupe(ctx, p->ino, EXT2FS_B2C(fs, *block_nr), p->inode);
finish:
p->cur_cluster = lc;
return 0;
}
@ -571,7 +578,7 @@ static void decrement_badcount(e2fsck_t ctx, blk64_t block,
static int delete_file_block(ext2_filsys fs,
blk64_t *block_nr,
e2_blkcnt_t blockcnt EXT2FS_ATTR((unused)),
e2_blkcnt_t blockcnt,
blk64_t ref_block EXT2FS_ATTR((unused)),
int ref_offset EXT2FS_ATTR((unused)),
void *priv_data)
@ -580,7 +587,7 @@ static int delete_file_block(ext2_filsys fs,
struct dup_cluster *p;
dnode_t *n;
e2fsck_t ctx;
blk64_t c;
blk64_t c, lc;
pb = (struct process_block_struct *) priv_data;
ctx = pb->ctx;
@ -589,10 +596,12 @@ static int delete_file_block(ext2_filsys fs,
return 0;
c = EXT2FS_B2C(fs, *block_nr);
lc = EXT2FS_B2C(fs, blockcnt);
if (ext2fs_test_block_bitmap2(ctx->block_dup_map, *block_nr)) {
n = dict_lookup(&clstr_dict, INT_TO_VOIDPTR(c));
if (n) {
p = (struct dup_cluster *) dnode_get(n);
if (lc != pb->cur_cluster)
decrement_badcount(ctx, *block_nr, p);
} else
com_err("delete_file_block", 0,
@ -603,6 +612,7 @@ static int delete_file_block(ext2_filsys fs,
ext2fs_block_alloc_stats2(fs, *block_nr, -1);
pb->dup_blocks++;
}
pb->cur_cluster = lc;
return 0;
}
@ -621,6 +631,7 @@ static void delete_file(e2fsck_t ctx, ext2_ino_t ino,
pb.dup_blocks = 0;
pb.ctx = ctx;
pctx.str = "delete_file";
pb.cur_cluster = ~0;
e2fsck_read_inode(ctx, ino, &inode, "delete_file");
if (ext2fs_inode_has_valid_blocks2(fs, &inode))
@ -703,8 +714,12 @@ static int clone_file_block(ext2_filsys fs,
if (check_if_fs_cluster(ctx, EXT2FS_B2C(fs, *block_nr)))
is_meta = 1;
if (((blockcnt > 0) && c == cs->dup_cluster) ||
ext2fs_test_block_bitmap2(ctx->block_dup_map, *block_nr)) {
if (c == cs->dup_cluster && cs->alloc_block) {
new_block = cs->alloc_block;
goto got_block;
}
if (ext2fs_test_block_bitmap2(ctx->block_dup_map, *block_nr)) {
n = dict_lookup(&clstr_dict,
INT_TO_VOIDPTR(EXT2FS_B2C(fs, *block_nr)));
if (!n) {
@ -718,28 +733,6 @@ static int clone_file_block(ext2_filsys fs,
if (!is_meta)
decrement_badcount(ctx, *block_nr, p);
if (p->num_bad == 0 && !is_meta) {
/*
* Normally num_bad never gets to zero; but in
* the case of bigalloc file systems, we don't
* how many blocks might be in use by a
* particular inode. So we may end up
* relocating the cluster even though this
* inode is the last user of the cluster. In
* that case, since we've already moved some
* of the blocks of that cluster, we'll
* complete the relocation and free the
* original cluster here.
*/
ext2fs_unmark_block_bitmap2(ctx->block_found_map,
*block_nr);
ext2fs_block_alloc_stats2(fs, *block_nr, -1);
}
if ((blockcnt > 0) && c == cs->dup_cluster) {
new_block = cs->alloc_block;
goto got_block;
}
cs->dup_cluster = c;
retval = ext2fs_new_block2(fs, 0, ctx->block_found_map,
@ -799,7 +792,7 @@ static int clone_file(e2fsck_t ctx, ext2_ino_t ino,
clear_problem_context(&pctx);
cs.errcode = 0;
cs.dir = 0;
cs.dup_cluster = 0;
cs.dup_cluster = ~0;
cs.alloc_block = 0;
cs.ctx = ctx;
retval = ext2fs_get_mem(fs->blocksize, &cs.buf);