#include <sys/types.h>
#endif
-#if EXT2_FLAT_INCLUDES
#include "ext2_fs.h"
-#else
-#include <linux/ext2_fs.h>
-#endif
+
#include "ext2fs.h"
#include "e2image.h"
+blk_t ext2fs_descriptor_block_loc(ext2_filsys fs, blk_t group_block, dgrp_t i)
+{
+ int bg;
+ int has_super = 0;
+ int ret_blk;
+
+ if (!(fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_META_BG) ||
+ (i < fs->super->s_first_meta_bg))
+ return (group_block + i + 1);
+
+ bg = (fs->blocksize / sizeof (struct ext2_group_desc)) * i;
+ if (ext2fs_bg_has_super(fs, bg))
+ has_super = 1;
+ ret_blk = (fs->super->s_first_data_block + has_super +
+ (bg * fs->super->s_blocks_per_group));
+ /*
+ * If group_block is not the normal value, we're trying to use
+ * the backup group descriptors and superblock --- so use the
+ * alternate location of the second block group in the
+ * metablock group. Ideally we should be testing each bg
+ * descriptor block individually for correctness, but we don't
+ * have the infrastructure in place to do that.
+ */
+ if (group_block != fs->super->s_first_data_block &&
+ ((ret_blk + fs->super->s_blocks_per_group) <
+ fs->super->s_blocks_count))
+ ret_blk += fs->super->s_blocks_per_group;
+ return ret_blk;
+}
+
+errcode_t ext2fs_open(const char *name, int flags, int superblock,
+ unsigned int block_size, io_manager manager,
+ ext2_filsys *ret_fs)
+{
+ return ext2fs_open2(name, 0, flags, superblock, block_size,
+ manager, ret_fs);
+}
+
/*
* Note: if superblock is non-zero, block-size must also be non-zero.
* Superblock and block_size can be zero to use the default size.
*
* EXT2_FLAG_RW - Open the filesystem for read/write.
* EXT2_FLAG_FORCE - Open the filesystem even if some of the
- * features aren't supported.
+ * features aren't supported.
+ * EXT2_FLAG_JOURNAL_DEV_OK - Open an ext3 journal device
*/
-errcode_t ext2fs_open(const char *name, int flags, int superblock,
- int block_size, io_manager manager, ext2_filsys *ret_fs)
+errcode_t ext2fs_open2(const char *name, const char *io_options,
+ int flags, int superblock,
+ unsigned int block_size, io_manager manager,
+ ext2_filsys *ret_fs)
{
ext2_filsys fs;
errcode_t retval;
- int i, j, groups_per_block;
- blk_t group_block;
- char *dest;
+ unsigned long i;
+ int j, groups_per_block, blocks_per_group;
+ blk_t group_block, blk;
+ char *dest, *cp;
struct ext2_group_desc *gdp;
EXT2_CHECK_MAGIC(manager, EXT2_ET_MAGIC_IO_MANAGER);
- retval = ext2fs_get_mem(sizeof(struct struct_ext2_filsys),
- (void **) &fs);
+ retval = ext2fs_get_mem(sizeof(struct struct_ext2_filsys), &fs);
if (retval)
return retval;
memset(fs, 0, sizeof(struct struct_ext2_filsys));
fs->magic = EXT2_ET_MAGIC_EXT2FS_FILSYS;
fs->flags = flags;
- retval = manager->open(name, (flags & EXT2_FLAG_RW) ? IO_FLAG_RW : 0,
- &fs->io);
+ fs->umask = 022;
+ retval = ext2fs_get_mem(strlen(name)+1, &fs->device_name);
if (retval)
goto cleanup;
- fs->io->app_data = fs;
- retval = ext2fs_get_mem(strlen(name)+1, (void **) &fs->device_name);
+ strcpy(fs->device_name, name);
+ cp = strchr(fs->device_name, '?');
+ if (!io_options && cp) {
+ *cp++ = 0;
+ io_options = cp;
+ }
+
+ retval = manager->open(fs->device_name,
+ (flags & EXT2_FLAG_RW) ? IO_FLAG_RW : 0,
+ &fs->io);
if (retval)
goto cleanup;
- strcpy(fs->device_name, name);
- retval = ext2fs_get_mem(SUPERBLOCK_SIZE, (void **) &fs->super);
+ if (io_options &&
+ (retval = io_channel_set_options(fs->io, io_options)))
+ goto cleanup;
+ fs->image_io = fs->io;
+ fs->io->app_data = fs;
+ retval = ext2fs_get_mem(SUPERBLOCK_SIZE, &fs->super);
if (retval)
goto cleanup;
if (flags & EXT2_FLAG_IMAGE_FILE) {
retval = ext2fs_get_mem(sizeof(struct ext2_image_hdr),
- (void **) &fs->image_header);
+ &fs->image_header);
if (retval)
goto cleanup;
retval = io_channel_read_blk(fs->io, 0,
goto cleanup;
}
io_channel_set_blksize(fs->io, block_size);
- group_block = superblock + 1;
+ group_block = superblock;
fs->orig_super = 0;
} else {
io_channel_set_blksize(fs->io, SUPERBLOCK_OFFSET);
superblock = 1;
group_block = 0;
- retval = ext2fs_get_mem(SUPERBLOCK_SIZE,
- (void **) &fs->orig_super);
+ retval = ext2fs_get_mem(SUPERBLOCK_SIZE, &fs->orig_super);
if (retval)
goto cleanup;
}
if (fs->orig_super)
memcpy(fs->orig_super, fs->super, SUPERBLOCK_SIZE);
+#ifdef EXT2FS_ENABLE_SWAPFS
if ((fs->super->s_magic == ext2fs_swab16(EXT2_SUPER_MAGIC)) ||
(fs->flags & EXT2_FLAG_SWAP_BYTES)) {
fs->flags |= EXT2_FLAG_SWAP_BYTES;
ext2fs_swap_super(fs->super);
}
+#endif
if (fs->super->s_magic != EXT2_SUPER_MAGIC) {
retval = EXT2_ET_BAD_MAGIC;
/*
* Read group descriptors
*/
- if ((EXT2_BLOCKS_PER_GROUP(fs->super)) == 0) {
+ blocks_per_group = EXT2_BLOCKS_PER_GROUP(fs->super);
+ if (blocks_per_group == 0 ||
+ blocks_per_group > EXT2_MAX_BLOCKS_PER_GROUP(fs->super) ||
+ fs->inode_blocks_per_group > EXT2_MAX_INODES_PER_GROUP(fs->super)) {
retval = EXT2_ET_CORRUPT_SUPERBLOCK;
goto cleanup;
}
fs->group_desc_count = (fs->super->s_blocks_count -
fs->super->s_first_data_block +
- EXT2_BLOCKS_PER_GROUP(fs->super) - 1)
- / EXT2_BLOCKS_PER_GROUP(fs->super);
+ blocks_per_group - 1) / blocks_per_group;
fs->desc_blocks = (fs->group_desc_count +
EXT2_DESC_PER_BLOCK(fs->super) - 1)
/ EXT2_DESC_PER_BLOCK(fs->super);
retval = ext2fs_get_mem(fs->desc_blocks * fs->blocksize,
- (void **) &fs->group_desc);
+ &fs->group_desc);
if (retval)
goto cleanup;
if (!group_block)
- group_block = fs->super->s_first_data_block + 1;
+ group_block = fs->super->s_first_data_block;
dest = (char *) fs->group_desc;
+ groups_per_block = fs->blocksize / sizeof(struct ext2_group_desc);
for (i=0 ; i < fs->desc_blocks; i++) {
- retval = io_channel_read_blk(fs->io, group_block, 1, dest);
+ blk = ext2fs_descriptor_block_loc(fs, group_block, i);
+ retval = io_channel_read_blk(fs->io, blk, 1, dest);
if (retval)
goto cleanup;
- group_block++;
+#ifdef EXT2FS_ENABLE_SWAPFS
if (fs->flags & EXT2_FLAG_SWAP_BYTES) {
gdp = (struct ext2_group_desc *) dest;
- groups_per_block = fs->blocksize /
- sizeof(struct ext2_group_desc);
for (j=0; j < groups_per_block; j++)
ext2fs_swap_group_desc(gdp++);
}
+#endif
dest += fs->blocksize;
}
return retval;
}
+/*
+ * Set/get the filesystem data I/O channel.
+ *
+ * These functions are only valid if EXT2_FLAG_IMAGE_FILE is true.
+ */
+errcode_t ext2fs_get_data_io(ext2_filsys fs, io_channel *old_io)
+{
+ if ((fs->flags & EXT2_FLAG_IMAGE_FILE) == 0)
+ return EXT2_ET_NOT_IMAGE_FILE;
+ if (old_io) {
+ *old_io = (fs->image_io == fs->io) ? 0 : fs->io;
+ }
+ return 0;
+}
+
+errcode_t ext2fs_set_data_io(ext2_filsys fs, io_channel new_io)
+{
+ if ((fs->flags & EXT2_FLAG_IMAGE_FILE) == 0)
+ return EXT2_ET_NOT_IMAGE_FILE;
+ fs->io = new_io ? new_io : fs->image_io;
+ return 0;
+}
+
+errcode_t ext2fs_rewrite_to_io(ext2_filsys fs, io_channel new_io)
+{
+ if ((fs->flags & EXT2_FLAG_IMAGE_FILE) == 0)
+ return EXT2_ET_NOT_IMAGE_FILE;
+ fs->io = fs->image_io = new_io;
+ fs->flags |= EXT2_FLAG_DIRTY | EXT2_FLAG_RW |
+ EXT2_FLAG_BB_DIRTY | EXT2_FLAG_IB_DIRTY;
+ fs->flags &= ~EXT2_FLAG_IMAGE_FILE;
+ return 0;
+}