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grub/fs/ext2.c
robertmh 6219127445 2008-05-30 Robert Millan <rmh@aybabtu.com> 
* commands/search.c (options): Add --fs_uuid option.
        (search_fs_uuid): New function.
        (grub_cmd_search): Fix --set argument passing.
        Use search_fs_uuid() when requested via --fs_uuid.
        (grub_search_init): Update help message.
        * fs/ext2.c (struct grub_ext2_sblock): Rename `unique_id' to `uuid'
        and redeclare it as an array of 16-bit words.
        (grub_ext2_uuid): New function.
        (grub_ext2_fs): Reference grub_ext2_uuid() in `uuid' struct member.
        * include/grub/fs.h (struct grub_fs): Add `uuid' struct member.
        * util/update-grub.in (GRUB_DEVICE_UUID, GRUB_DEVICE_BOOT)
        (GRUB_DEVICE_BOOT_UUID): New variables.
        (GRUB_DRIVE. GRUB_DRIVE_BOOT. GRUB_DRIVE_BOOT_GRUB): Remove.
        * util/grub.d/00_header.in: Set root using `search --fs_uuid' command
        whenever possible.
        * util/grub.d/10_hurd.in: Avoid explicit use of root drive.  Instead,
        just assume `root' variable has the right value.
        * util/grub.d/10_linux.in: Likewise.
        * util/grub-probe.c (probe): Probe for filesystem UUID when requested
        via PRINT_FS_UUID.
        (main): Recognise `-t fs_uuid' argument.
2008-05-30 11:04:08 +00:00

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/* ext2.c - Second Extended filesystem */
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2003,2004,2005,2007,2008 Free Software Foundation, Inc.
*
* GRUB is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GRUB is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
/* Magic value used to identify an ext2 filesystem. */
#define EXT2_MAGIC 0xEF53
/* Amount of indirect blocks in an inode. */
#define INDIRECT_BLOCKS 12
/* Maximum length of a pathname. */
#define EXT2_PATH_MAX 4096
/* Maximum nesting of symlinks, used to prevent a loop. */
#define EXT2_MAX_SYMLINKCNT 8
/* The good old revision and the default inode size. */
#define EXT2_GOOD_OLD_REVISION 0
#define EXT2_GOOD_OLD_INODE_SIZE 128
/* Filetype used in directory entry. */
#define FILETYPE_UNKNOWN 0
#define FILETYPE_REG 1
#define FILETYPE_DIRECTORY 2
#define FILETYPE_SYMLINK 7
/* Filetype information as used in inodes. */
#define FILETYPE_INO_MASK 0170000
#define FILETYPE_INO_REG 0100000
#define FILETYPE_INO_DIRECTORY 0040000
#define FILETYPE_INO_SYMLINK 0120000
#include <grub/err.h>
#include <grub/file.h>
#include <grub/mm.h>
#include <grub/misc.h>
#include <grub/disk.h>
#include <grub/dl.h>
#include <grub/types.h>
#include <grub/fshelp.h>
/* Log2 size of ext2 block in 512 blocks. */
#define LOG2_EXT2_BLOCK_SIZE(data) \
(grub_le_to_cpu32 (data->sblock.log2_block_size) + 1)
/* Log2 size of ext2 block in bytes. */
#define LOG2_BLOCK_SIZE(data) \
(grub_le_to_cpu32 (data->sblock.log2_block_size) + 10)
/* The size of an ext2 block in bytes. */
#define EXT2_BLOCK_SIZE(data) (1 << LOG2_BLOCK_SIZE (data))
/* The revision level. */
#define EXT2_REVISION(data) grub_le_to_cpu32 (data->sblock.revision_level)
/* The inode size. */
#define EXT2_INODE_SIZE(data) \
(EXT2_REVISION (data) == EXT2_GOOD_OLD_REVISION \
? EXT2_GOOD_OLD_INODE_SIZE \
: grub_le_to_cpu16 (data->sblock.inode_size))
#define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004
#define EXT3_JOURNAL_MAGIC_NUMBER 0xc03b3998U
#define EXT3_JOURNAL_DESCRIPTOR_BLOCK 1
#define EXT3_JOURNAL_COMMIT_BLOCK 2
#define EXT3_JOURNAL_SUPERBLOCK_V1 3
#define EXT3_JOURNAL_SUPERBLOCK_V2 4
#define EXT3_JOURNAL_REVOKE_BLOCK 5
#define EXT3_JOURNAL_FLAG_ESCAPE 1
#define EXT3_JOURNAL_FLAG_SAME_UUID 2
#define EXT3_JOURNAL_FLAG_DELETED 4
#define EXT3_JOURNAL_FLAG_LAST_TAG 8
/* The ext2 superblock. */
struct grub_ext2_sblock
{
grub_uint32_t total_inodes;
grub_uint32_t total_blocks;
grub_uint32_t reserved_blocks;
grub_uint32_t free_blocks;
grub_uint32_t free_inodes;
grub_uint32_t first_data_block;
grub_uint32_t log2_block_size;
grub_uint32_t log2_fragment_size;
grub_uint32_t blocks_per_group;
grub_uint32_t fragments_per_group;
grub_uint32_t inodes_per_group;
grub_uint32_t mtime;
grub_uint32_t utime;
grub_uint16_t mnt_count;
grub_uint16_t max_mnt_count;
grub_uint16_t magic;
grub_uint16_t fs_state;
grub_uint16_t error_handling;
grub_uint16_t minor_revision_level;
grub_uint32_t lastcheck;
grub_uint32_t checkinterval;
grub_uint32_t creator_os;
grub_uint32_t revision_level;
grub_uint16_t uid_reserved;
grub_uint16_t gid_reserved;
grub_uint32_t first_inode;
grub_uint16_t inode_size;
grub_uint16_t block_group_number;
grub_uint32_t feature_compatibility;
grub_uint32_t feature_incompat;
grub_uint32_t feature_ro_compat;
grub_uint16_t uuid[8];
char volume_name[16];
char last_mounted_on[64];
grub_uint32_t compression_info;
grub_uint8_t prealloc_blocks;
grub_uint8_t prealloc_dir_blocks;
grub_uint16_t reserved_gdt_blocks;
grub_uint8_t journal_uuid[16];
grub_uint32_t journal_inum;
grub_uint32_t journal_dev;
grub_uint32_t last_orphan;
grub_uint32_t hash_seed[4];
grub_uint8_t def_hash_version;
grub_uint8_t jnl_backup_type;
grub_uint16_t reserved_word_pad;
grub_uint32_t default_mount_opts;
grub_uint32_t first_meta_bg;
grub_uint32_t mkfs_time;
grub_uint32_t jnl_blocks[17];
};
/* The ext2 blockgroup. */
struct grub_ext2_block_group
{
grub_uint32_t block_id;
grub_uint32_t inode_id;
grub_uint32_t inode_table_id;
grub_uint16_t free_blocks;
grub_uint16_t free_inodes;
grub_uint16_t used_dirs;
grub_uint16_t pad;
grub_uint32_t reserved[3];
};
/* The ext2 inode. */
struct grub_ext2_inode
{
grub_uint16_t mode;
grub_uint16_t uid;
grub_uint32_t size;
grub_uint32_t atime;
grub_uint32_t ctime;
grub_uint32_t mtime;
grub_uint32_t dtime;
grub_uint16_t gid;
grub_uint16_t nlinks;
grub_uint32_t blockcnt; /* Blocks of 512 bytes!! */
grub_uint32_t flags;
grub_uint32_t osd1;
union
{
struct datablocks
{
grub_uint32_t dir_blocks[INDIRECT_BLOCKS];
grub_uint32_t indir_block;
grub_uint32_t double_indir_block;
grub_uint32_t triple_indir_block;
} blocks;
char symlink[60];
};
grub_uint32_t version;
grub_uint32_t acl;
grub_uint32_t dir_acl;
grub_uint32_t fragment_addr;
grub_uint32_t osd2[3];
};
/* The header of an ext2 directory entry. */
struct ext2_dirent
{
grub_uint32_t inode;
grub_uint16_t direntlen;
grub_uint8_t namelen;
grub_uint8_t filetype;
};
struct grub_ext3_journal_header
{
grub_uint32_t magic;
grub_uint32_t block_type;
grub_uint32_t sequence;
};
struct grub_ext3_journal_revoke_header
{
struct grub_ext3_journal_header header;
grub_uint32_t count;
grub_uint32_t data[0];
};
struct grub_ext3_journal_block_tag
{
grub_uint32_t block;
grub_uint32_t flags;
};
struct grub_ext3_journal_sblock
{
struct grub_ext3_journal_header header;
grub_uint32_t block_size;
grub_uint32_t maxlen;
grub_uint32_t first;
grub_uint32_t sequence;
grub_uint32_t start;
};
struct grub_fshelp_node
{
struct grub_ext2_data *data;
struct grub_ext2_inode inode;
int ino;
int inode_read;
};
/* Information about a "mounted" ext2 filesystem. */
struct grub_ext2_data
{
struct grub_ext2_sblock sblock;
grub_disk_t disk;
struct grub_ext2_inode *inode;
struct grub_fshelp_node diropen;
struct grub_fshelp_node logfile;
grub_fshelp_journal_t journal;
};
#ifndef GRUB_UTIL
static grub_dl_t my_mod;
#endif
/* Read into BLKGRP the blockgroup descriptor of blockgroup GROUP of
the mounted filesystem DATA. */
inline static grub_err_t
grub_ext2_blockgroup (struct grub_ext2_data *data, int group,
struct grub_ext2_block_group *blkgrp)
{
return grub_disk_read (data->disk,
(grub_fshelp_map_block (data->journal,
grub_le_to_cpu32 (data->sblock.first_data_block) + 1)
<< LOG2_EXT2_BLOCK_SIZE (data)),
group * sizeof (struct grub_ext2_block_group),
sizeof (struct grub_ext2_block_group), (char *) blkgrp);
}
static grub_disk_addr_t
grub_ext2_read_block (grub_fshelp_node_t node, grub_disk_addr_t fileblock)
{
struct grub_ext2_data *data = node->data;
struct grub_ext2_inode *inode = &node->inode;
int blknr;
unsigned int blksz = EXT2_BLOCK_SIZE (data);
int log2_blksz = LOG2_EXT2_BLOCK_SIZE (data);
/* Direct blocks. */
if (fileblock < INDIRECT_BLOCKS)
blknr = grub_le_to_cpu32 (inode->blocks.dir_blocks[fileblock]);
/* Indirect. */
else if (fileblock < INDIRECT_BLOCKS + blksz / 4)
{
grub_uint32_t indir[blksz / 4];
if (grub_disk_read (data->disk,
grub_fshelp_map_block(data->journal,
grub_le_to_cpu32 (inode->blocks.indir_block))
<< log2_blksz,
0, blksz, (char *) indir))
return grub_errno;
blknr = grub_le_to_cpu32 (indir[fileblock - INDIRECT_BLOCKS]);
}
/* Double indirect. */
else if (fileblock < INDIRECT_BLOCKS + blksz / 4 * (blksz / 4 + 1))
{
unsigned int perblock = blksz / 4;
unsigned int rblock = fileblock - (INDIRECT_BLOCKS
+ blksz / 4);
grub_uint32_t indir[blksz / 4];
if (grub_disk_read (data->disk,
grub_fshelp_map_block(data->journal,
grub_le_to_cpu32 (inode->blocks.double_indir_block))
<< log2_blksz,
0, blksz, (char *) indir))
return grub_errno;
if (grub_disk_read (data->disk,
grub_fshelp_map_block(data->journal,
grub_le_to_cpu32 (indir[rblock / perblock]))
<< log2_blksz,
0, blksz, (char *) indir))
return grub_errno;
blknr = grub_le_to_cpu32 (indir[rblock % perblock]);
}
/* triple indirect. */
else
{
grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
"ext2fs doesn't support triple indirect blocks");
blknr = -1;
}
return grub_fshelp_map_block (data->journal, blknr);
}
/* Read LEN bytes from the file described by DATA starting with byte
POS. Return the amount of read bytes in READ. */
static grub_ssize_t
grub_ext2_read_file (grub_fshelp_node_t node,
void NESTED_FUNC_ATTR (*read_hook) (grub_disk_addr_t sector,
unsigned offset, unsigned length),
int pos, grub_size_t len, char *buf)
{
return grub_fshelp_read_file (node->data->disk, node, read_hook,
pos, len, buf, grub_ext2_read_block,
node->inode.size,
LOG2_EXT2_BLOCK_SIZE (node->data));
}
/* Read the inode INO for the file described by DATA into INODE. */
static grub_err_t
grub_ext2_read_inode (struct grub_ext2_data *data,
int ino, struct grub_ext2_inode *inode)
{
struct grub_ext2_block_group blkgrp;
struct grub_ext2_sblock *sblock = &data->sblock;
int inodes_per_block;
unsigned int blkno;
unsigned int blkoff;
/* It is easier to calculate if the first inode is 0. */
ino--;
grub_ext2_blockgroup (data,
ino / grub_le_to_cpu32 (sblock->inodes_per_group),
&blkgrp);
if (grub_errno)
return grub_errno;
inodes_per_block = EXT2_BLOCK_SIZE (data) / EXT2_INODE_SIZE (data);
blkno = (ino % grub_le_to_cpu32 (sblock->inodes_per_group))
/ inodes_per_block;
blkoff = (ino % grub_le_to_cpu32 (sblock->inodes_per_group))
% inodes_per_block;
/* Read the inode. */
if (grub_disk_read (data->disk,
grub_fshelp_map_block(data->journal,
grub_le_to_cpu32 (blkgrp.inode_table_id) + blkno)
<< LOG2_EXT2_BLOCK_SIZE (data),
EXT2_INODE_SIZE (data) * blkoff,
sizeof (struct grub_ext2_inode), (char *) inode))
return grub_errno;
return 0;
}
static void
grub_ext3_get_journal (struct grub_ext2_data *data)
{
char buf[1 << LOG2_BLOCK_SIZE (data)];
struct grub_ext3_journal_sblock *jsb;
grub_fshelp_journal_t log;
int last_num, num, block, log2bs;
grub_uint32_t seq;
auto void next_block (void);
void next_block (void)
{
block++;
if (block >= log->last_block)
block = log->first_block;
}
data->journal = 0;
if (! (data->sblock.feature_compatibility & EXT3_FEATURE_COMPAT_HAS_JOURNAL))
return;
if (! data->sblock.journal_inum)
return;
data->logfile.data = data;
data->logfile.ino = data->sblock.journal_inum;
data->logfile.inode_read = 1;
if (grub_ext2_read_inode (data, data->logfile.ino, &data->logfile.inode))
return;
log2bs = LOG2_EXT2_BLOCK_SIZE (data);
if (grub_fshelp_read_file (data->disk, &data->logfile, 0,
0, sizeof (struct grub_ext3_journal_sblock),
buf, grub_ext2_read_block,
sizeof (buf), log2bs) !=
sizeof (struct grub_ext3_journal_sblock))
return;
jsb = (struct grub_ext3_journal_sblock *) &buf[0];
if (grub_be_to_cpu32 (jsb->header.magic) != EXT3_JOURNAL_MAGIC_NUMBER)
return;
/* Empty journal. */
if (! jsb->start)
return;
log = grub_malloc (sizeof (struct grub_fshelp_journal) +
grub_be_to_cpu32 (jsb->maxlen) * sizeof (grub_disk_addr_t));
if (! log)
return;
log->type = GRUB_FSHELP_JOURNAL_TYPE_FILE;
log->node = &data->logfile;
log->get_block = grub_ext2_read_block;
log->first_block = grub_be_to_cpu32 (jsb->first);
log->last_block = grub_be_to_cpu32 (jsb->maxlen);
log->start_block = grub_be_to_cpu32 (jsb->start);
last_num = num = 0;
block = log->start_block;
seq = grub_be_to_cpu32 (jsb->sequence);
while (1)
{
struct grub_ext3_journal_header *jh;
if (grub_fshelp_read_file (data->disk, &data->logfile, 0,
block << (log2bs + 9), sizeof (buf),
buf, grub_ext2_read_block,
log->last_block << (log2bs + 9),
log2bs) !=
(int) sizeof (buf))
break;
jh = (struct grub_ext3_journal_header *) &buf[0];
if (grub_be_to_cpu32 (jh->magic) != EXT3_JOURNAL_MAGIC_NUMBER)
break;
if (grub_be_to_cpu32 (jh->sequence) != seq)
break;
log->mapping[num++] = GRUB_FSHELP_JOURNAL_UNUSED_MAPPING;
next_block();
switch (grub_be_to_cpu32 (jh->block_type))
{
case EXT3_JOURNAL_DESCRIPTOR_BLOCK:
{
struct grub_ext3_journal_block_tag *tag;
int ofs, flags;
ofs = sizeof (struct grub_ext3_journal_header);
do
{
tag = (struct grub_ext3_journal_block_tag *) &buf[ofs];
ofs += sizeof (struct grub_ext3_journal_block_tag);
if (ofs > (int) sizeof (buf))
break;
flags = grub_be_to_cpu32 (tag->flags);
if (! (flags & EXT3_JOURNAL_FLAG_SAME_UUID))
ofs += 16;
log->mapping[num++] = grub_be_to_cpu32 (tag->block);
next_block();
}
while (! (flags & EXT3_JOURNAL_FLAG_LAST_TAG));
continue;
}
case EXT3_JOURNAL_COMMIT_BLOCK:
{
seq++;
last_num = num - 1;
continue;
}
case EXT3_JOURNAL_REVOKE_BLOCK:
{
struct grub_ext3_journal_revoke_header *jrh;
grub_uint32_t i;
jrh = (struct grub_ext3_journal_revoke_header *) jh;
for (i = 0; i < grub_be_to_cpu32 (jrh->count); i++)
{
int j;
grub_uint32_t map;
map = grub_be_to_cpu32 (jrh->data[i]);
for (j = 0; j < num; j++)
if (log->mapping[j] == map)
log->mapping[j] = GRUB_FSHELP_JOURNAL_UNUSED_MAPPING;
}
continue;
}
default:
last_num = 0;
goto quit;
}
}
quit:
if (! last_num)
grub_free (log);
else
{
int size;
size = sizeof (struct grub_fshelp_journal) +
last_num * sizeof (grub_disk_addr_t);
log->num_mappings = last_num;
data->journal = grub_realloc (log, size);
}
}
static struct grub_ext2_data *
grub_ext2_mount (grub_disk_t disk)
{
struct grub_ext2_data *data;
data = grub_malloc (sizeof (struct grub_ext2_data));
if (!data)
return 0;
/* Read the superblock. */
grub_disk_read (disk, 1 * 2, 0, sizeof (struct grub_ext2_sblock),
(char *) &data->sblock);
if (grub_errno)
goto fail;
/* Make sure this is an ext2 filesystem. */
if (grub_le_to_cpu16 (data->sblock.magic) != EXT2_MAGIC)
goto fail;
data->disk = disk;
grub_ext3_get_journal (data);
data->diropen.data = data;
data->diropen.ino = 2;
data->diropen.inode_read = 1;
data->inode = &data->diropen.inode;
grub_ext2_read_inode (data, 2, data->inode);
if (grub_errno)
goto fail;
return data;
fail:
grub_error (GRUB_ERR_BAD_FS, "not an ext2 filesystem");
grub_free (data);
return 0;
}
static char *
grub_ext2_read_symlink (grub_fshelp_node_t node)
{
char *symlink;
struct grub_fshelp_node *diro = node;
if (! diro->inode_read)
{
grub_ext2_read_inode (diro->data, diro->ino, &diro->inode);
if (grub_errno)
return 0;
}
symlink = grub_malloc (grub_le_to_cpu32 (diro->inode.size) + 1);
if (! symlink)
return 0;
/* If the filesize of the symlink is bigger than
60 the symlink is stored in a separate block,
otherwise it is stored in the inode. */
if (grub_le_to_cpu32 (diro->inode.size) <= 60)
grub_strncpy (symlink,
diro->inode.symlink,
grub_le_to_cpu32 (diro->inode.size));
else
{
grub_ext2_read_file (diro, 0, 0,
grub_le_to_cpu32 (diro->inode.size),
symlink);
if (grub_errno)
{
grub_free (symlink);
return 0;
}
}
symlink[grub_le_to_cpu32 (diro->inode.size)] = '\0';
return symlink;
}
static int
grub_ext2_iterate_dir (grub_fshelp_node_t dir,
int NESTED_FUNC_ATTR
(*hook) (const char *filename,
enum grub_fshelp_filetype filetype,
grub_fshelp_node_t node))
{
unsigned int fpos = 0;
struct grub_fshelp_node *diro = (struct grub_fshelp_node *) dir;
if (! diro->inode_read)
{
grub_ext2_read_inode (diro->data, diro->ino, &diro->inode);
if (grub_errno)
return 0;
}
/* Search the file. */
while (fpos < grub_le_to_cpu32 (diro->inode.size))
{
struct ext2_dirent dirent;
grub_ext2_read_file (diro, 0, fpos, sizeof (struct ext2_dirent),
(char *) &dirent);
if (grub_errno)
return 0;
if (dirent.namelen != 0)
{
char filename[dirent.namelen + 1];
struct grub_fshelp_node *fdiro;
enum grub_fshelp_filetype type = GRUB_FSHELP_UNKNOWN;
grub_ext2_read_file (diro, 0, fpos + sizeof (struct ext2_dirent),
dirent.namelen, filename);
if (grub_errno)
return 0;
fdiro = grub_malloc (sizeof (struct grub_fshelp_node));
if (! fdiro)
return 0;
fdiro->data = diro->data;
fdiro->ino = grub_le_to_cpu32 (dirent.inode);
filename[dirent.namelen] = '\0';
if (dirent.filetype != FILETYPE_UNKNOWN)
{
fdiro->inode_read = 0;
if (dirent.filetype == FILETYPE_DIRECTORY)
type = GRUB_FSHELP_DIR;
else if (dirent.filetype == FILETYPE_SYMLINK)
type = GRUB_FSHELP_SYMLINK;
else if (dirent.filetype == FILETYPE_REG)
type = GRUB_FSHELP_REG;
}
else
{
/* The filetype can not be read from the dirent, read
the inode to get more information. */
grub_ext2_read_inode (diro->data,
grub_le_to_cpu32 (dirent.inode),
&fdiro->inode);
if (grub_errno)
{
grub_free (fdiro);
return 0;
}
fdiro->inode_read = 1;
if ((grub_le_to_cpu16 (fdiro->inode.mode)
& FILETYPE_INO_MASK) == FILETYPE_INO_DIRECTORY)
type = GRUB_FSHELP_DIR;
else if ((grub_le_to_cpu16 (fdiro->inode.mode)
& FILETYPE_INO_MASK) == FILETYPE_INO_SYMLINK)
type = GRUB_FSHELP_SYMLINK;
else if ((grub_le_to_cpu16 (fdiro->inode.mode)
& FILETYPE_INO_MASK) == FILETYPE_INO_REG)
type = GRUB_FSHELP_REG;
}
if (hook (filename, type, fdiro))
return 1;
}
fpos += grub_le_to_cpu16 (dirent.direntlen);
}
return 0;
}
/* Open a file named NAME and initialize FILE. */
static grub_err_t
grub_ext2_open (struct grub_file *file, const char *name)
{
struct grub_ext2_data *data;
struct grub_fshelp_node *fdiro = 0;
#ifndef GRUB_UTIL
grub_dl_ref (my_mod);
#endif
data = grub_ext2_mount (file->device->disk);
if (! data)
goto fail;
grub_fshelp_find_file (name, &data->diropen, &fdiro, grub_ext2_iterate_dir,
grub_ext2_read_symlink, GRUB_FSHELP_REG);
if (grub_errno)
goto fail;
if (! fdiro->inode_read)
{
grub_ext2_read_inode (data, fdiro->ino, &fdiro->inode);
if (grub_errno)
goto fail;
}
grub_memcpy (data->inode, &fdiro->inode, sizeof (struct grub_ext2_inode));
grub_free (fdiro);
file->size = grub_le_to_cpu32 (data->inode->size);
file->data = data;
file->offset = 0;
return 0;
fail:
if (fdiro != &data->diropen)
grub_free (fdiro);
grub_free (data);
#ifndef GRUB_UTIL
grub_dl_unref (my_mod);
#endif
return grub_errno;
}
static grub_err_t
grub_ext2_close (grub_file_t file)
{
if (file->data)
{
grub_free (((struct grub_ext2_data *) file->data)->journal);
grub_free (file->data);
}
#ifndef GRUB_UTIL
grub_dl_unref (my_mod);
#endif
return GRUB_ERR_NONE;
}
/* Read LEN bytes data from FILE into BUF. */
static grub_ssize_t
grub_ext2_read (grub_file_t file, char *buf, grub_size_t len)
{
struct grub_ext2_data *data = (struct grub_ext2_data *) file->data;
return grub_ext2_read_file (&data->diropen, file->read_hook,
file->offset, len, buf);
}
static grub_err_t
grub_ext2_dir (grub_device_t device, const char *path,
int (*hook) (const char *filename, int dir))
{
struct grub_ext2_data *data = 0;;
struct grub_fshelp_node *fdiro = 0;
auto int NESTED_FUNC_ATTR iterate (const char *filename,
enum grub_fshelp_filetype filetype,
grub_fshelp_node_t node);
int NESTED_FUNC_ATTR iterate (const char *filename,
enum grub_fshelp_filetype filetype,
grub_fshelp_node_t node)
{
grub_free (node);
if (filetype == GRUB_FSHELP_DIR)
return hook (filename, 1);
else
return hook (filename, 0);
return 0;
}
#ifndef GRUB_UTIL
grub_dl_ref (my_mod);
#endif
data = grub_ext2_mount (device->disk);
if (! data)
goto fail;
grub_fshelp_find_file (path, &data->diropen, &fdiro, grub_ext2_iterate_dir,
grub_ext2_read_symlink, GRUB_FSHELP_DIR);
if (grub_errno)
goto fail;
grub_ext2_iterate_dir (fdiro, iterate);
fail:
if (fdiro != &data->diropen)
grub_free (fdiro);
grub_free (data);
#ifndef GRUB_UTIL
grub_dl_unref (my_mod);
#endif
return grub_errno;
}
static grub_err_t
grub_ext2_label (grub_device_t device, char **label)
{
struct grub_ext2_data *data;
grub_disk_t disk = device->disk;
#ifndef GRUB_UTIL
grub_dl_ref (my_mod);
#endif
data = grub_ext2_mount (disk);
if (data)
*label = grub_strndup (data->sblock.volume_name, 14);
else
*label = NULL;
#ifndef GRUB_UTIL
grub_dl_unref (my_mod);
#endif
grub_free (data);
return grub_errno;
}
static grub_err_t
grub_ext2_uuid (grub_device_t device, char **uuid)
{
struct grub_ext2_data *data;
grub_disk_t disk = device->disk;
#ifndef GRUB_UTIL
grub_dl_ref (my_mod);
#endif
data = grub_ext2_mount (disk);
if (data)
{
*uuid = grub_malloc (40 + sizeof ('\0'));
grub_sprintf (*uuid, "%02x%02x-%02x-%02x-%02x-%02x%02x%02x",
grub_be_to_cpu16 (data->sblock.uuid[0]), grub_be_to_cpu16 (data->sblock.uuid[1]),
grub_be_to_cpu16 (data->sblock.uuid[2]), grub_be_to_cpu16 (data->sblock.uuid[3]),
grub_be_to_cpu16 (data->sblock.uuid[4]), grub_be_to_cpu16 (data->sblock.uuid[5]),
grub_be_to_cpu16 (data->sblock.uuid[6]), grub_be_to_cpu16 (data->sblock.uuid[7]));
}
else
*uuid = NULL;
#ifndef GRUB_UTIL
grub_dl_unref (my_mod);
#endif
grub_free (data);
return grub_errno;
}
static struct grub_fs grub_ext2_fs =
{
.name = "ext2",
.dir = grub_ext2_dir,
.open = grub_ext2_open,
.read = grub_ext2_read,
.close = grub_ext2_close,
.label = grub_ext2_label,
.uuid = grub_ext2_uuid,
.next = 0
};
GRUB_MOD_INIT(ext2)
{
grub_fs_register (&grub_ext2_fs);
#ifndef GRUB_UTIL
my_mod = mod;
#endif
}
GRUB_MOD_FINI(ext2)
{
grub_fs_unregister (&grub_ext2_fs);
}
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