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Add generic logical block size support for UDF.

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* grub-core/fs/udf.c (GRUB_UDF_LOG2_BLKSIZE): Removed.
	(GRUB_UDF_BLKSZ): Removed.
	(struct grub_udf_data): New field "lbshift" to hold the logical	block
	size of the file system in log2 format. All users updated.
	(sblocklist): Change type to unsigned.
	(grub_udf_mount): Change type of "sblklist" to unsigned.
	Move AVDP search before VRS recognition, because the latter requires
	knowledge of the logical block size, which is detected during the
	former.
	Detect and validate logical block size during AVDP search, adding
	support for block sizes 512, 1024 and 4096.
	Make VRS recognition independent of block size.
This commit is contained in:
Giuseppe Caizzone 2010-11-14 16:58:50 +01:00 committed by Vladimir 'phcoder' Serbinenko
parent cb0229c587
commit e53609331b
2 changed files with 74 additions and 48 deletions
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17
ChangeLog
View file

@ -1,3 +1,20 @@
2010-11-14 Giuseppe Caizzone <acaizzo@gmail.com>
Add generic logical block size support for UDF.
* grub-core/fs/udf.c (GRUB_UDF_LOG2_BLKSIZE): Removed.
(GRUB_UDF_BLKSZ): Removed.
(struct grub_udf_data): New field "lbshift" to hold the logical block
size of the file system in log2 format. All users updated.
(sblocklist): Change type to unsigned.
(grub_udf_mount): Change type of "sblklist" to unsigned.
Move AVDP search before VRS recognition, because the latter requires
knowledge of the logical block size, which is detected during the
former.
Detect and validate logical block size during AVDP search, adding
support for block sizes 512, 1024 and 4096.
Make VRS recognition independent of block size.
2010-11-14 Giuseppe Caizzone <acaizzo@gmail.com>
Properly handle deleted files on UDF.

105
grub-core/fs/udf.c
View file

@ -34,9 +34,6 @@
#define U32 grub_le_to_cpu32
#define U64 grub_le_to_cpu64
#define GRUB_UDF_LOG2_BLKSZ 2
#define GRUB_UDF_BLKSZ 2048
#define GRUB_UDF_TAG_IDENT_PVD 0x0001
#define GRUB_UDF_TAG_IDENT_AVDP 0x0002
#define GRUB_UDF_TAG_IDENT_VDP 0x0003
@ -343,7 +340,7 @@ struct grub_udf_data
struct grub_udf_pd pds[GRUB_UDF_MAX_PDS];
struct grub_udf_partmap *pms[GRUB_UDF_MAX_PMS];
struct grub_udf_long_ad root_icb;
int npd, npm;
int npd, npm, lbshift;
};
struct grub_fshelp_node
@ -389,7 +386,7 @@ grub_udf_read_icb (struct grub_udf_data *data,
if (grub_errno)
return grub_errno;
if (grub_disk_read (data->disk, block << GRUB_UDF_LOG2_BLKSZ, 0,
if (grub_disk_read (data->disk, block << data->lbshift, 0,
sizeof (struct grub_udf_file_entry),
&node->fe))
return grub_errno;
@ -427,7 +424,7 @@ grub_udf_read_block (grub_fshelp_node_t node, grub_disk_addr_t fileblock)
struct grub_udf_short_ad *ad = (struct grub_udf_short_ad *) ptr;
len /= sizeof (struct grub_udf_short_ad);
filebytes = fileblock * GRUB_UDF_BLKSZ;
filebytes = fileblock * U32 (node->data->lvd.bsize);
while (len > 0)
{
if (filebytes < U32 (ad->length))
@ -435,7 +432,8 @@ grub_udf_read_block (grub_fshelp_node_t node, grub_disk_addr_t fileblock)
(grub_udf_get_block (node->data,
node->part_ref,
ad->position)
+ (filebytes / GRUB_UDF_BLKSZ)));
+ (filebytes >> (GRUB_DISK_SECTOR_BITS
+ node->data->lbshift))));
filebytes -= U32 (ad->length);
ad++;
@ -447,7 +445,7 @@ grub_udf_read_block (grub_fshelp_node_t node, grub_disk_addr_t fileblock)
struct grub_udf_long_ad *ad = (struct grub_udf_long_ad *) ptr;
len /= sizeof (struct grub_udf_long_ad);
filebytes = fileblock * GRUB_UDF_BLKSZ;
filebytes = fileblock * U32 (node->data->lvd.bsize);
while (len > 0)
{
if (filebytes < U32 (ad->length))
@ -455,7 +453,8 @@ grub_udf_read_block (grub_fshelp_node_t node, grub_disk_addr_t fileblock)
(grub_udf_get_block (node->data,
ad->block.part_ref,
ad->block.block_num)
+ (filebytes / GRUB_UDF_BLKSZ)));
+ (filebytes >> (GRUB_DISK_SECTOR_BITS
+ node->data->lbshift))));
filebytes -= U32 (ad->length);
ad++;
@ -496,21 +495,21 @@ grub_udf_read_file (grub_fshelp_node_t node,
}
return grub_fshelp_read_file (node->data->disk, node, read_hook,
pos, len, buf, grub_udf_read_block,
U64 (node->fe.file_size),
GRUB_UDF_LOG2_BLKSZ);
pos, len, buf, grub_udf_read_block,
U64 (node->fe.file_size),
node->data->lbshift);
}
static int sblocklist[] = { 256, 512, 0 };
static unsigned sblocklist[] = { 256, 512, 0 };
static struct grub_udf_data *
grub_udf_mount (grub_disk_t disk)
{
struct grub_udf_data *data = 0;
struct grub_udf_fileset root_fs;
int *sblklist = sblocklist;
grub_uint32_t block;
int i;
unsigned *sblklist;
grub_uint32_t block, vblock;
int i, lbshift;
data = grub_malloc (sizeof (struct grub_udf_data));
if (!data)
@ -518,12 +517,48 @@ grub_udf_mount (grub_disk_t disk)
data->disk = disk;
/* Search for Anchor Volume Descriptor Pointer (AVDP)
* and determine logical block size. */
block = 0;
for (lbshift = 0; lbshift < 4; lbshift++)
{
for (sblklist = sblocklist; *sblklist; sblklist++)
{
struct grub_udf_avdp avdp;
if (grub_disk_read (disk, *sblklist << lbshift, 0,
sizeof (struct grub_udf_avdp), &avdp))
{
grub_error (GRUB_ERR_BAD_FS, "not an UDF filesystem");
goto fail;
}
if (U16 (avdp.tag.tag_ident) == GRUB_UDF_TAG_IDENT_AVDP &&
U32 (avdp.tag.tag_location) == *sblklist)
{
block = U32 (avdp.vds.start);
break;
}
}
if (block)
break;
}
if (!block)
{
grub_error (GRUB_ERR_BAD_FS, "not an UDF filesystem");
goto fail;
}
data->lbshift = lbshift;
/* Search for Volume Recognition Sequence (VRS). */
for (block = 16;; block++)
for (vblock = (32767 >> (lbshift + GRUB_DISK_SECTOR_BITS)) + 1;;
vblock += (2047 >> (lbshift + GRUB_DISK_SECTOR_BITS)) + 1)
{
struct grub_udf_vrs vrs;
if (grub_disk_read (disk, block << GRUB_UDF_LOG2_BLKSZ, 0,
if (grub_disk_read (disk, vblock << lbshift, 0,
sizeof (struct grub_udf_vrs), &vrs))
{
grub_error (GRUB_ERR_BAD_FS, "not an UDF filesystem");
@ -545,39 +580,13 @@ grub_udf_mount (grub_disk_t disk)
}
}
/* Search for Anchor Volume Descriptor Pointer (AVDP). */
while (1)
{
struct grub_udf_avdp avdp;
if (grub_disk_read (disk, *sblklist << GRUB_UDF_LOG2_BLKSZ, 0,
sizeof (struct grub_udf_avdp), &avdp))
{
grub_error (GRUB_ERR_BAD_FS, "not an UDF filesystem");
goto fail;
}
if (U16 (avdp.tag.tag_ident) == GRUB_UDF_TAG_IDENT_AVDP)
{
block = U32 (avdp.vds.start);
break;
}
sblklist++;
if (*sblklist == 0)
{
grub_error (GRUB_ERR_BAD_FS, "not an UDF filesystem");
goto fail;
}
}
data->npd = data->npm = 0;
/* Locate Partition Descriptor (PD) and Logical Volume Descriptor (LVD). */
while (1)
{
struct grub_udf_tag tag;
if (grub_disk_read (disk, block << GRUB_UDF_LOG2_BLKSZ, 0,
if (grub_disk_read (disk, block << lbshift, 0,
sizeof (struct grub_udf_tag), &tag))
{
grub_error (GRUB_ERR_BAD_FS, "not an UDF filesystem");
@ -593,7 +602,7 @@ grub_udf_mount (grub_disk_t disk)
goto fail;
}
if (grub_disk_read (disk, block << GRUB_UDF_LOG2_BLKSZ, 0,
if (grub_disk_read (disk, block << lbshift, 0,
sizeof (struct grub_udf_pd),
&data->pds[data->npd]))
{
@ -609,7 +618,7 @@ grub_udf_mount (grub_disk_t disk)
struct grub_udf_partmap *ppm;
if (grub_disk_read (disk, block << GRUB_UDF_LOG2_BLKSZ, 0,
if (grub_disk_read (disk, block << lbshift, 0,
sizeof (struct grub_udf_lvd),
&data->lvd))
{
@ -673,7 +682,7 @@ grub_udf_mount (grub_disk_t disk)
if (grub_errno)
goto fail;
if (grub_disk_read (disk, block << GRUB_UDF_LOG2_BLKSZ, 0,
if (grub_disk_read (disk, block << lbshift, 0,
sizeof (struct grub_udf_fileset), &root_fs))
{
grub_error (GRUB_ERR_BAD_FS, "not an UDF filesystem");