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Honor chunk number for directories

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This commit is contained in:
Vladimir 'phcoder' Serbinenko 2010-12-09 02:48:59 +01:00
parent 0a040470e5
commit 7ed6c3e85f
1 changed files with 34 additions and 14 deletions
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48
grub-core/fs/squash4.c
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@ -52,7 +52,8 @@ struct grub_squash_super
grub_uint32_t creation_time;
grub_uint32_t dummy2;
grub_uint32_t dummy3[4];
grub_uint32_t root_ino;
grub_uint16_t root_ino_offset;
grub_uint16_t root_ino_chunk;
grub_uint32_t dummy4;
grub_uint64_t total_size;
grub_uint64_t exttbloffset;
@ -71,11 +72,19 @@ struct grub_squash_inode
grub_uint16_t type;
grub_uint16_t dummy1[3];
grub_uint32_t mtime;
grub_uint16_t dummy2[6];
grub_uint16_t dummy2[2];
grub_uint16_t chunk;
grub_uint16_t dummy3[3];
grub_uint32_t offset;
grub_uint32_t size;
} __attribute__ ((packed));
static inline unsigned
decode_chunk_number (grub_uint16_t in)
{
return (grub_le_to_cpu16 (in) & 0xff) / 2;
}
/* Chunk-based. */
struct grub_squash_dirent_header
{
@ -102,8 +111,10 @@ struct grub_squash_dirent
static grub_err_t
read_chunk (grub_disk_t disk, void *buf, grub_size_t len,
grub_uint64_t chunk_start, grub_uint64_t offset)
grub_uint64_t chunk, unsigned nchunk, grub_off_t offset)
{
grub_uint64_t chunk_start;
chunk_start = grub_le_to_cpu64 (chunk);
while (len > 0)
{
grub_uint64_t csize;
@ -116,9 +127,12 @@ read_chunk (grub_disk_t disk, void *buf, grub_size_t len,
sizeof (d), &d);
if (err)
return err;
if (offset < SQUASH_CHUNK_SIZE)
if (!nchunk && offset < SQUASH_CHUNK_SIZE)
break;
offset -= SQUASH_CHUNK_SIZE;
if (nchunk)
nchunk--;
else
offset -= SQUASH_CHUNK_SIZE;
chunk_start += 2 + (grub_le_to_cpu16 (d) & ~SQUASH_CHUNK_FLAGS);
}
@ -197,13 +211,15 @@ grub_squash_iterate_dir (grub_fshelp_node_t dir,
/* FIXME: determine this. */
unsigned numheaders = 1;
unsigned i, j;
for (j = 0; j < numheaders; j++)
{
struct grub_squash_dirent_header dh;
grub_err_t err;
err = read_chunk (dir->data->disk, &dh, sizeof (dh),
grub_le_to_cpu64 (dir->data->sb.diroffset), off);
dir->data->sb.diroffset,
decode_chunk_number (dir->ino.chunk), off);
if (err)
return 0;
off += sizeof (dh);
@ -217,14 +233,16 @@ grub_squash_iterate_dir (grub_fshelp_node_t dir,
struct grub_squash_inode ino;
err = read_chunk (dir->data->disk, &di, sizeof (di),
grub_le_to_cpu64 (dir->data->sb.diroffset), off);
dir->data->sb.diroffset,
decode_chunk_number (dir->ino.chunk), off);
if (err)
return 0;
off += sizeof (di);
err = read_chunk (dir->data->disk, &ino, sizeof (ino),
grub_le_to_cpu64 (dir->data->sb.inodeoffset),
grub_le_to_cpu16 (di.ino));
dir->data->sb.inodeoffset,
0,
grub_cpu_to_le16 (di.ino));
if (err)
return 0;
@ -233,7 +251,8 @@ grub_squash_iterate_dir (grub_fshelp_node_t dir,
return 0;
err = read_chunk (dir->data->disk, buf,
grub_le_to_cpu16 (di.namelen) + 1,
grub_le_to_cpu64 (dir->data->sb.diroffset), off);
dir->data->sb.diroffset,
decode_chunk_number (dir->ino.chunk), off);
if (err)
return 0;
@ -261,10 +280,11 @@ make_root_node (struct grub_squash_data *data, struct grub_fshelp_node *root)
{
grub_memset (root, 0, sizeof (*root));
root->data = data;
return read_chunk (data->disk, &root->ino, sizeof (root->ino),
grub_le_to_cpu64 (data->sb.inodeoffset),
grub_le_to_cpu32 (data->sb.root_ino));
return read_chunk (data->disk, &root->ino, sizeof (root->ino),
data->sb.inodeoffset,
decode_chunk_number (data->sb.root_ino_chunk),
grub_cpu_to_le16 (data->sb.root_ino_offset));
}
static grub_err_t