From d36c4c3115977beb5f9247c6c6f0a2a209389f45 Mon Sep 17 00:00:00 2001 From: Vladimir 'phcoder' Serbinenko Date: Wed, 26 Sep 2012 09:33:41 +0200 Subject: [PATCH 047/364] * grub-core/fs/affs.c (grub_affs_mount): Support AFFS bootblock in sector 1. --- ChangeLog | 5 ++ grub-core/fs/affs.c | 139 ++++++++++++++++++++++++++-------------------------- 2 files changed, 74 insertions(+), 70 deletions(-) diff --git a/ChangeLog b/ChangeLog index a53c5cc..d81a9a6 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,3 +1,8 @@ +2012-09-26 Vladimir Serbinenko + + * grub-core/fs/affs.c (grub_affs_mount): Support AFFS bootblock in + sector 1. + 2012-09-24 Colin Watson * util/grub-install.in: Make the error message if $source_dir diff --git a/grub-core/fs/affs.c b/grub-core/fs/affs.c index ef65479..848a455 100644 --- a/grub-core/fs/affs.c +++ b/grub-core/fs/affs.c @@ -97,6 +97,7 @@ enum }; #define AFFS_MAX_LOG_BLOCK_SIZE 4 +#define AFFS_MAX_SUPERBLOCK 1 @@ -184,94 +185,92 @@ grub_affs_mount (grub_disk_t disk) { struct grub_affs_data *data; grub_uint32_t *rootblock = 0; - struct grub_affs_rblock *rblock; + struct grub_affs_rblock *rblock = 0; int log_blocksize = 0; + int bsnum = 0; data = grub_zalloc (sizeof (struct grub_affs_data)); if (!data) return 0; - /* Read the bootblock. */ - grub_disk_read (disk, 0, 0, sizeof (struct grub_affs_bblock), - &data->bblock); - if (grub_errno) - goto fail; - - /* Make sure this is an affs filesystem. */ - if (grub_strncmp ((char *) (data->bblock.type), "DOS", 3)) - { - grub_error (GRUB_ERR_BAD_FS, "not an AFFS filesystem"); - goto fail; - } - - /* Test if the filesystem is a OFS filesystem. */ - if (! (data->bblock.flags & GRUB_AFFS_FLAG_FFS)) - { - grub_error (GRUB_ERR_BAD_FS, "OFS not yet supported"); - goto fail; - } - - /* No sane person uses more than 8KB for a block. At least I hope - for that person because in that case this won't work. */ - rootblock = grub_malloc (GRUB_DISK_SECTOR_SIZE << AFFS_MAX_LOG_BLOCK_SIZE); - if (!rootblock) - goto fail; - - rblock = (struct grub_affs_rblock *) rootblock; - - /* The filesystem blocksize is not stored anywhere in the filesystem - itself. One way to determine it is try reading blocks for the - rootblock until the checksum is correct. */ - for (log_blocksize = 0; log_blocksize <= AFFS_MAX_LOG_BLOCK_SIZE; - log_blocksize++) + for (bsnum = 0; bsnum < AFFS_MAX_SUPERBLOCK + 1; bsnum++) { - grub_uint32_t *currblock = rootblock; - unsigned int i; - grub_uint32_t checksum = 0; - - /* Read the rootblock. */ - grub_disk_read (disk, - (grub_uint64_t) grub_be_to_cpu32 (data->bblock.rootblock) - << log_blocksize, 0, - GRUB_DISK_SECTOR_SIZE << log_blocksize, rootblock); + /* Read the bootblock. */ + grub_disk_read (disk, bsnum, 0, sizeof (struct grub_affs_bblock), + &data->bblock); if (grub_errno) goto fail; - if (rblock->type != grub_cpu_to_be32_compile_time (2) - || rblock->htsize == 0 - || currblock[(GRUB_DISK_SECTOR_SIZE << log_blocksize) - / sizeof (*currblock) - 1] - != grub_cpu_to_be32_compile_time (1)) + /* Make sure this is an affs filesystem. */ + if (grub_strncmp ((char *) (data->bblock.type), "DOS", 3) != 0 + /* Test if the filesystem is a OFS filesystem. */ + || !(data->bblock.flags & GRUB_AFFS_FLAG_FFS)) continue; - for (i = 0; i < (GRUB_DISK_SECTOR_SIZE << log_blocksize) - / sizeof (*currblock); - i++) - checksum += grub_be_to_cpu32 (currblock[i]); + /* No sane person uses more than 8KB for a block. At least I hope + for that person because in that case this won't work. */ + if (!rootblock) + rootblock = grub_malloc (GRUB_DISK_SECTOR_SIZE + << AFFS_MAX_LOG_BLOCK_SIZE); + if (!rootblock) + goto fail; - if (checksum == 0) - break; - } - if (log_blocksize > AFFS_MAX_LOG_BLOCK_SIZE) - { - grub_error (GRUB_ERR_BAD_FS, "AFFS blocksize couldn't be determined"); - goto fail; - } + rblock = (struct grub_affs_rblock *) rootblock; + + /* The filesystem blocksize is not stored anywhere in the filesystem + itself. One way to determine it is try reading blocks for the + rootblock until the checksum is correct. */ + for (log_blocksize = 0; log_blocksize <= AFFS_MAX_LOG_BLOCK_SIZE; + log_blocksize++) + { + grub_uint32_t *currblock = rootblock; + unsigned int i; + grub_uint32_t checksum = 0; + + /* Read the rootblock. */ + grub_disk_read (disk, + (grub_uint64_t) grub_be_to_cpu32 (data->bblock.rootblock) + << log_blocksize, 0, + GRUB_DISK_SECTOR_SIZE << log_blocksize, rootblock); + if (grub_errno == GRUB_ERR_OUT_OF_RANGE) + { + grub_errno = 0; + break; + } + if (grub_errno) + goto fail; - data->log_blocksize = log_blocksize; - data->disk = disk; - data->htsize = grub_be_to_cpu32 (rblock->htsize); - data->diropen.data = data; - data->diropen.block = grub_be_to_cpu32 (data->bblock.rootblock); - data->diropen.parent = NULL; - grub_memcpy (&data->diropen.di, rootblock, sizeof (data->diropen.di)); + if (rblock->type != grub_cpu_to_be32_compile_time (2) + || rblock->htsize == 0 + || currblock[(GRUB_DISK_SECTOR_SIZE << log_blocksize) + / sizeof (*currblock) - 1] + != grub_cpu_to_be32_compile_time (1)) + continue; - grub_free (rootblock); + for (i = 0; i < (GRUB_DISK_SECTOR_SIZE << log_blocksize) + / sizeof (*currblock); + i++) + checksum += grub_be_to_cpu32 (currblock[i]); - return data; + if (checksum == 0) + { + data->log_blocksize = log_blocksize; + data->disk = disk; + data->htsize = grub_be_to_cpu32 (rblock->htsize); + data->diropen.data = data; + data->diropen.block = grub_be_to_cpu32 (data->bblock.rootblock); + data->diropen.parent = NULL; + grub_memcpy (&data->diropen.di, rootblock, + sizeof (data->diropen.di)); + grub_free (rootblock); + + return data; + } + } + } fail: - if (grub_errno == GRUB_ERR_OUT_OF_RANGE) + if (grub_errno == GRUB_ERR_NONE || grub_errno == GRUB_ERR_OUT_OF_RANGE) grub_error (GRUB_ERR_BAD_FS, "not an AFFS filesystem"); grub_free (data); -- 1.8.1.4