Esempio n. 1
0
/*
 * This code assumes that the reserved blocks have already been marked in-use
 * during ext2fs_initialize(), so that they are not allocated for other
 * uses before we can add them to the resize inode (which has to come
 * after the creation of the inode table).
 */
errcode_t ext2fs_create_resize_inode(ext2_filsys fs)
{
	errcode_t		retval, retval2;
	struct ext2_super_block	*sb;
	struct ext2_inode	inode;
	__u32			*dindir_buf, *gdt_buf;
	unsigned long long	apb, inode_size;
	/* FIXME-64 - can't deal with extents */
	blk_t			dindir_blk, rsv_off, gdt_off, gdt_blk;
	int			dindir_dirty = 0, inode_dirty = 0, sb_blk = 0;

	EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);

	sb = fs->super;

	retval = ext2fs_get_array(2, fs->blocksize, &dindir_buf);
	if (retval)
		return retval;
	gdt_buf = (__u32 *)((char *)dindir_buf + fs->blocksize);

	retval = ext2fs_read_inode(fs, EXT2_RESIZE_INO, &inode);
	if (retval)
		goto out_free;

	/*
	 * File systems with a blocksize of 1024 and bigalloc have
	 * sb->s_first_data_block of 0; yet the superblock is still at
	 * block #1.  We compensate for it here.
	 */
	sb_blk = sb->s_first_data_block;
	if (fs->blocksize == 1024 && sb_blk == 0)
		sb_blk = 1;

	/* Maximum possible file size (we donly use the dindirect blocks) */
	apb = EXT2_ADDR_PER_BLOCK(sb);
	if ((dindir_blk = inode.i_block[EXT2_DIND_BLOCK])) {
#ifdef RES_GDT_DEBUG
		printf("reading GDT dindir %u\n", dindir_blk);
#endif
		retval = ext2fs_read_ind_block(fs, dindir_blk, dindir_buf);
		if (retval)
			goto out_inode;
	} else {
		blk_t goal = sb_blk + fs->desc_blocks +
			sb->s_reserved_gdt_blocks + 2 +
			fs->inode_blocks_per_group;

		retval = ext2fs_alloc_block(fs, goal, 0, &dindir_blk);
		if (retval)
			goto out_free;
		inode.i_mode = LINUX_S_IFREG | 0600;
		inode.i_links_count = 1;
		inode.i_block[EXT2_DIND_BLOCK] = dindir_blk;
		ext2fs_iblk_set(fs, &inode, 1);
		memset(dindir_buf, 0, fs->blocksize);
#ifdef RES_GDT_DEBUG
		printf("allocated GDT dindir %u\n", dindir_blk);
#endif
		dindir_dirty = inode_dirty = 1;
		inode_size = apb*apb + apb + EXT2_NDIR_BLOCKS;
		inode_size *= fs->blocksize;
		retval = ext2fs_inode_size_set(fs, &inode, inode_size);
		if (retval)
			goto out_free;
		inode.i_ctime = fs->now ? fs->now : time(0);
	}

	for (rsv_off = 0, gdt_off = fs->desc_blocks,
	     gdt_blk = sb_blk + 1 + fs->desc_blocks;
	     rsv_off < sb->s_reserved_gdt_blocks;
	     rsv_off++, gdt_off++, gdt_blk++) {
		unsigned int three = 1, five = 5, seven = 7;
		unsigned int grp, last = 0;
		int gdt_dirty = 0;

		gdt_off %= apb;
		if (!dindir_buf[gdt_off]) {
			/* FIXME XXX XXX
			blk_t new_blk;

			retval = ext2fs_new_block(fs, gdt_blk, 0, &new_blk);
			if (retval)
				goto out_free;
			if (new_blk != gdt_blk) {
				// XXX free block
				retval = -1; // XXX
			}
			*/
			gdt_dirty = dindir_dirty = inode_dirty = 1;
			memset(gdt_buf, 0, fs->blocksize);
			dindir_buf[gdt_off] = gdt_blk;
			ext2fs_iblk_add_blocks(fs, &inode, 1);
#ifdef RES_GDT_DEBUG
			printf("added primary GDT block %u at %u[%u]\n",
			       gdt_blk, dindir_blk, gdt_off);
#endif
		} else if (dindir_buf[gdt_off] == gdt_blk) {
#ifdef RES_GDT_DEBUG
			printf("reading primary GDT block %u\n", gdt_blk);
#endif
			retval = ext2fs_read_ind_block(fs, gdt_blk, gdt_buf);
			if (retval)
				goto out_dindir;
		} else {
#ifdef RES_GDT_DEBUG
			printf("bad primary GDT %u != %u at %u[%u]\n",
			       dindir_buf[gdt_off], gdt_blk,dindir_blk,gdt_off);
#endif
			retval = EXT2_ET_RESIZE_INODE_CORRUPT;
			goto out_dindir;
		}

		while ((grp = list_backups(fs, &three, &five, &seven)) <
		       fs->group_desc_count) {
			blk_t expect = gdt_blk + grp * sb->s_blocks_per_group;

			if (!gdt_buf[last]) {
#ifdef RES_GDT_DEBUG
				printf("added backup GDT %u grp %[email protected]%u[%u]\n",
				       expect, grp, gdt_blk, last);
#endif
				gdt_buf[last] = expect;
				ext2fs_iblk_add_blocks(fs, &inode, 1);
				gdt_dirty = inode_dirty = 1;
			} else if (gdt_buf[last] != expect) {
#ifdef RES_GDT_DEBUG
				printf("bad backup GDT %u != %u at %u[%u]\n",
				       gdt_buf[last], expect, gdt_blk, last);
#endif
				retval = EXT2_ET_RESIZE_INODE_CORRUPT;
				goto out_dindir;
			}
			last++;
		}
		if (gdt_dirty) {
#ifdef RES_GDT_DEBUG
			printf("writing primary GDT block %u\n", gdt_blk);
#endif
			retval = ext2fs_write_ind_block(fs, gdt_blk, gdt_buf);
			if (retval)
				goto out_dindir;
		}
	}

out_dindir:
	if (dindir_dirty) {
		retval2 = ext2fs_write_ind_block(fs, dindir_blk, dindir_buf);
		if (!retval)
			retval = retval2;
	}
out_inode:
#ifdef RES_GDT_DEBUG
	printf("inode.i_blocks = %u, i_size = %u\n", inode.i_blocks,
	       inode.i_size);
#endif
	if (inode_dirty) {
		inode.i_atime = inode.i_mtime = fs->now ? fs->now : time(0);
		retval2 = ext2fs_write_new_inode(fs, EXT2_RESIZE_INO, &inode);
		if (!retval)
			retval = retval2;
	}
out_free:
	ext2fs_free_mem(&dindir_buf);
	return retval;
}
Esempio n. 2
0
/*
 * Common code for mount and mountroot.
 */
static int
ext2_mountfs(struct vnode *devvp, struct mount *mp)
{
	struct ext2mount *ump;
	struct buf *bp;
	struct m_ext2fs *fs;
	struct ext2fs *es;
	struct cdev *dev = devvp->v_rdev;
	struct g_consumer *cp;
	struct bufobj *bo;
	struct csum *sump;
	int error;
	int ronly;
	int i, size;
	int32_t *lp;

	ronly = vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0);
	/* XXX: use VOP_ACESS to check FS perms */
	DROP_GIANT();
	g_topology_lock();
	error = g_vfs_open(devvp, &cp, "ext2fs", ronly ? 0 : 1);
	g_topology_unlock();
	PICKUP_GIANT();
	VOP_UNLOCK(devvp, 0);
	if (error)
		return (error);

	/* XXX: should we check for some sectorsize or 512 instead? */
	if (((SBSIZE % cp->provider->sectorsize) != 0) ||
	    (SBSIZE < cp->provider->sectorsize)) {
		DROP_GIANT();
		g_topology_lock();
		g_vfs_close(cp);
		g_topology_unlock();
		PICKUP_GIANT();
		return (EINVAL);
	}

	bo = &devvp->v_bufobj;
	bo->bo_private = cp;
	bo->bo_ops = g_vfs_bufops;
	if (devvp->v_rdev->si_iosize_max != 0)
		mp->mnt_iosize_max = devvp->v_rdev->si_iosize_max;
	if (mp->mnt_iosize_max > MAXPHYS)
		mp->mnt_iosize_max = MAXPHYS;

	bp = NULL;
	ump = NULL;
	if ((error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp)) != 0)
		goto out;
	es = (struct ext2fs *)bp->b_data;
	if (ext2_check_sb_compat(es, dev, ronly) != 0) {
		error = EINVAL;		/* XXX needs translation */
		goto out;
	}
	if ((es->e2fs_state & E2FS_ISCLEAN) == 0 ||
	    (es->e2fs_state & E2FS_ERRORS)) {
		if (ronly || (mp->mnt_flag & MNT_FORCE)) {
			printf(
"WARNING: Filesystem was not properly dismounted\n");
		} else {
			printf(
"WARNING: R/W mount denied.  Filesystem is not clean - run fsck\n");
			error = EPERM;
			goto out;
		}
	}
	ump = malloc(sizeof(*ump), M_EXT2MNT, M_WAITOK | M_ZERO);

	/*
	 * I don't know whether this is the right strategy. Note that
	 * we dynamically allocate both an ext2_sb_info and an ext2_super_block
	 * while Linux keeps the super block in a locked buffer.
	 */
	ump->um_e2fs = malloc(sizeof(struct m_ext2fs),
		M_EXT2MNT, M_WAITOK);
	ump->um_e2fs->e2fs = malloc(sizeof(struct ext2fs),
		M_EXT2MNT, M_WAITOK);
	mtx_init(EXT2_MTX(ump), "EXT2FS", "EXT2FS Lock", MTX_DEF);
	bcopy(es, ump->um_e2fs->e2fs, (u_int)sizeof(struct ext2fs));
	if ((error = compute_sb_data(devvp, ump->um_e2fs->e2fs, ump->um_e2fs)))
		goto out;

	/*
	 * Calculate the maximum contiguous blocks and size of cluster summary
	 * array.  In FFS this is done by newfs; however, the superblock 
	 * in ext2fs doesn't have these variables, so we can calculate 
	 * them here.
	 */
	ump->um_e2fs->e2fs_maxcontig = MAX(1, MAXPHYS / ump->um_e2fs->e2fs_bsize);
	if (ump->um_e2fs->e2fs_maxcontig > 0)
		ump->um_e2fs->e2fs_contigsumsize =
		    MIN(ump->um_e2fs->e2fs_maxcontig, EXT2_MAXCONTIG);
	else
		ump->um_e2fs->e2fs_contigsumsize = 0;
	if (ump->um_e2fs->e2fs_contigsumsize > 0) {
		size = ump->um_e2fs->e2fs_gcount * sizeof(int32_t);
		ump->um_e2fs->e2fs_maxcluster = malloc(size, M_EXT2MNT, M_WAITOK);
		size = ump->um_e2fs->e2fs_gcount * sizeof(struct csum);
		ump->um_e2fs->e2fs_clustersum = malloc(size, M_EXT2MNT, M_WAITOK);
		lp = ump->um_e2fs->e2fs_maxcluster;
		sump = ump->um_e2fs->e2fs_clustersum;
		for (i = 0; i < ump->um_e2fs->e2fs_gcount; i++, sump++) {
			*lp++ = ump->um_e2fs->e2fs_contigsumsize;
			sump->cs_init = 0;
			sump->cs_sum = malloc((ump->um_e2fs->e2fs_contigsumsize + 1) *
			    sizeof(int32_t), M_EXT2MNT, M_WAITOK | M_ZERO);
		}
	}

	brelse(bp);
	bp = NULL;
	fs = ump->um_e2fs;
	fs->e2fs_ronly = ronly;	/* ronly is set according to mnt_flags */

	/*
	 * If the fs is not mounted read-only, make sure the super block is
	 * always written back on a sync().
	 */
	fs->e2fs_wasvalid = fs->e2fs->e2fs_state & E2FS_ISCLEAN ? 1 : 0;
	if (ronly == 0) {
		fs->e2fs_fmod = 1;		/* mark it modified */
		fs->e2fs->e2fs_state &= ~E2FS_ISCLEAN;	/* set fs invalid */
	}
	mp->mnt_data = ump;
	mp->mnt_stat.f_fsid.val[0] = dev2udev(dev);
	mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum;
	mp->mnt_maxsymlinklen = EXT2_MAXSYMLINKLEN;
	MNT_ILOCK(mp);
	mp->mnt_flag |= MNT_LOCAL;
	MNT_IUNLOCK(mp);
	ump->um_mountp = mp;
	ump->um_dev = dev;
	ump->um_devvp = devvp;
	ump->um_bo = &devvp->v_bufobj;
	ump->um_cp = cp;

	/*
	 * Setting those two parameters allowed us to use
	 * ufs_bmap w/o changse!
	 */
	ump->um_nindir = EXT2_ADDR_PER_BLOCK(fs);
	ump->um_bptrtodb = fs->e2fs->e2fs_log_bsize + 1;
	ump->um_seqinc = EXT2_FRAGS_PER_BLOCK(fs);
	if (ronly == 0)
		ext2_sbupdate(ump, MNT_WAIT);
	/*
	 * Initialize filesystem stat information in mount struct.
	 */
	MNT_ILOCK(mp);
 	mp->mnt_kern_flag |= MNTK_MPSAFE | MNTK_LOOKUP_SHARED |
            MNTK_EXTENDED_SHARED;
	MNT_IUNLOCK(mp);
	return (0);
out:
	if (bp)
		brelse(bp);
	if (cp != NULL) {
		DROP_GIANT();
		g_topology_lock();
		g_vfs_close(cp);
		g_topology_unlock();
		PICKUP_GIANT();
	}
	if (ump) {
	  	mtx_destroy(EXT2_MTX(ump));
		free(ump->um_e2fs->e2fs_gd, M_EXT2MNT);
		free(ump->um_e2fs->e2fs_contigdirs, M_EXT2MNT);
		free(ump->um_e2fs->e2fs, M_EXT2MNT);
		free(ump->um_e2fs, M_EXT2MNT);
		free(ump, M_EXT2MNT);
		mp->mnt_data = NULL;
	}
	return (error);
}
Esempio n. 3
0
struct super_block * ext2_read_super (struct super_block * sb, void * data,
				      int silent)
{
	struct buffer_head * bh;
  	struct ext2_sb_info * sbi = EXT2_SB(sb);
	struct ext2_super_block * es;
	unsigned long sb_block = 1;
	unsigned short resuid = EXT2_DEF_RESUID;
	unsigned short resgid = EXT2_DEF_RESGID;
	unsigned long block;
	unsigned long logic_sb_block = 1;
	unsigned long offset = 0;
	kdev_t dev = sb->s_dev;
	int blocksize = BLOCK_SIZE;
	int db_count;
	int i, j;

	/*
	 * See what the current blocksize for the device is, and
	 * use that as the blocksize.  Otherwise (or if the blocksize
	 * is smaller than the default) use the default.
	 * This is important for devices that have a hardware
	 * sectorsize that is larger than the default.
	 */
	blocksize = get_hardsect_size(dev);
	if(blocksize < BLOCK_SIZE )
	    blocksize = BLOCK_SIZE;

	sb->u.ext2_sb.s_mount_opt = 0;
	if (!parse_options ((char *) data, &sb_block, &resuid, &resgid,
	    &sb->u.ext2_sb.s_mount_opt)) {
		return NULL;
	}

	if (set_blocksize(dev, blocksize) < 0) {
		printk ("EXT2-fs: unable to set blocksize %d\n", blocksize);
		return NULL;
	}
	sb->s_blocksize = blocksize;

	/*
	 * If the superblock doesn't start on a sector boundary,
	 * calculate the offset.  FIXME(eric) this doesn't make sense
	 * that we would have to do this.
	 */
	if (blocksize != BLOCK_SIZE) {
		logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize;
		offset = (sb_block*BLOCK_SIZE) % blocksize;
	}

	if (!(bh = sb_bread(sb, logic_sb_block))) {
		printk ("EXT2-fs: unable to read superblock\n");
		return NULL;
	}
	/*
	 * Note: s_es must be initialized as soon as possible because
	 *       some ext2 macro-instructions depend on its value
	 */
	es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
	sb->u.ext2_sb.s_es = es;
	sb->s_magic = le16_to_cpu(es->s_magic);
	if (sb->s_magic != EXT2_SUPER_MAGIC) {
		if (!silent)
			printk ("VFS: Can't find ext2 filesystem on dev %s.\n",
				bdevname(dev));
		goto failed_mount;
	}
	if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV &&
	    (EXT2_HAS_COMPAT_FEATURE(sb, ~0U) ||
	     EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
	     EXT2_HAS_INCOMPAT_FEATURE(sb, ~0U)))
		printk("EXT2-fs warning: feature flags set on rev 0 fs, "
		       "running e2fsck is recommended\n");
	/*
	 * Check feature flags regardless of the revision level, since we
	 * previously didn't change the revision level when setting the flags,
	 * so there is a chance incompat flags are set on a rev 0 filesystem.
	 */
	if ((i = EXT2_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP))) {
		printk("EXT2-fs: %s: couldn't mount because of "
		       "unsupported optional features (%x).\n",
		       bdevname(dev), i);
		goto failed_mount;
	}
	if (!(sb->s_flags & MS_RDONLY) &&
	    (i = EXT2_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))){
		printk("EXT2-fs: %s: couldn't mount RDWR because of "
		       "unsupported optional features (%x).\n",
		       bdevname(dev), i);
		goto failed_mount;
	}
	if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL))
		ext2_warning(sb, __FUNCTION__,
			"mounting ext3 filesystem as ext2\n");
	sb->s_blocksize_bits =
		le32_to_cpu(EXT2_SB(sb)->s_es->s_log_block_size) + 10;
	sb->s_blocksize = 1 << sb->s_blocksize_bits;

	sb->s_maxbytes = ext2_max_size(sb->s_blocksize_bits);

	/* If the blocksize doesn't match, re-read the thing.. */
	if (sb->s_blocksize != blocksize) {
		blocksize = sb->s_blocksize;
		brelse(bh);

		if (set_blocksize(dev, blocksize) < 0) {
			printk(KERN_ERR "EXT2-fs: blocksize too small for device.\n");
			return NULL;
		}

		logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize;
		offset = (sb_block*BLOCK_SIZE) % blocksize;
		bh = sb_bread(sb, logic_sb_block);
		if(!bh) {
			printk("EXT2-fs: Couldn't read superblock on "
			       "2nd try.\n");
			goto failed_mount;
		}
		es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
		sb->u.ext2_sb.s_es = es;
		if (es->s_magic != le16_to_cpu(EXT2_SUPER_MAGIC)) {
			printk ("EXT2-fs: Magic mismatch, very weird !\n");
			goto failed_mount;
		}
	}

	if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) {
		sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE;
		sbi->s_first_ino = EXT2_GOOD_OLD_FIRST_INO;
	} else {
		sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
		sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
		if ((sbi->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE) ||
		    (sbi->s_inode_size & (sbi->s_inode_size - 1)) ||
		    (sbi->s_inode_size > blocksize)) {
			printk ("EXT2-fs: unsupported inode size: %d\n",
				sbi->s_inode_size);
			goto failed_mount;
		}
	}
	sb->u.ext2_sb.s_frag_size = EXT2_MIN_FRAG_SIZE <<
				   le32_to_cpu(es->s_log_frag_size);
	if (sb->u.ext2_sb.s_frag_size)
		sb->u.ext2_sb.s_frags_per_block = sb->s_blocksize /
						  sb->u.ext2_sb.s_frag_size;
	else
		sb->s_magic = 0;
	sb->u.ext2_sb.s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
	sb->u.ext2_sb.s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
	sb->u.ext2_sb.s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);
	sb->u.ext2_sb.s_inodes_per_block = sb->s_blocksize /
					   EXT2_INODE_SIZE(sb);
	sb->u.ext2_sb.s_itb_per_group = sb->u.ext2_sb.s_inodes_per_group /
				        sb->u.ext2_sb.s_inodes_per_block;
	sb->u.ext2_sb.s_desc_per_block = sb->s_blocksize /
					 sizeof (struct ext2_group_desc);
	sb->u.ext2_sb.s_sbh = bh;
	if (resuid != EXT2_DEF_RESUID)
		sb->u.ext2_sb.s_resuid = resuid;
	else
		sb->u.ext2_sb.s_resuid = le16_to_cpu(es->s_def_resuid);
	if (resgid != EXT2_DEF_RESGID)
		sb->u.ext2_sb.s_resgid = resgid;
	else
		sb->u.ext2_sb.s_resgid = le16_to_cpu(es->s_def_resgid);
	sb->u.ext2_sb.s_mount_state = le16_to_cpu(es->s_state);
	sb->u.ext2_sb.s_addr_per_block_bits =
		log2 (EXT2_ADDR_PER_BLOCK(sb));
	sb->u.ext2_sb.s_desc_per_block_bits =
		log2 (EXT2_DESC_PER_BLOCK(sb));
	if (sb->s_magic != EXT2_SUPER_MAGIC) {
		if (!silent)
			printk ("VFS: Can't find an ext2 filesystem on dev "
				"%s.\n",
				bdevname(dev));
		goto failed_mount;
	}
	if (sb->s_blocksize != bh->b_size) {
		if (!silent)
			printk ("VFS: Unsupported blocksize on dev "
				"%s.\n", bdevname(dev));
		goto failed_mount;
	}

	if (sb->s_blocksize != sb->u.ext2_sb.s_frag_size) {
		printk ("EXT2-fs: fragsize %lu != blocksize %lu (not supported yet)\n",
			sb->u.ext2_sb.s_frag_size, sb->s_blocksize);
		goto failed_mount;
	}

	if (sb->u.ext2_sb.s_blocks_per_group > sb->s_blocksize * 8) {
		printk ("EXT2-fs: #blocks per group too big: %lu\n",
			sb->u.ext2_sb.s_blocks_per_group);
		goto failed_mount;
	}
	if (sb->u.ext2_sb.s_frags_per_group > sb->s_blocksize * 8) {
		printk ("EXT2-fs: #fragments per group too big: %lu\n",
			sb->u.ext2_sb.s_frags_per_group);
		goto failed_mount;
	}
	if (sb->u.ext2_sb.s_inodes_per_group > sb->s_blocksize * 8) {
		printk ("EXT2-fs: #inodes per group too big: %lu\n",
			sb->u.ext2_sb.s_inodes_per_group);
		goto failed_mount;
	}

	sb->u.ext2_sb.s_groups_count = (le32_to_cpu(es->s_blocks_count) -
				        le32_to_cpu(es->s_first_data_block) +
				       EXT2_BLOCKS_PER_GROUP(sb) - 1) /
				       EXT2_BLOCKS_PER_GROUP(sb);
	db_count = (sb->u.ext2_sb.s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) /
		   EXT2_DESC_PER_BLOCK(sb);
	sb->u.ext2_sb.s_group_desc = kmalloc (db_count * sizeof (struct buffer_head *), GFP_KERNEL);
	if (sb->u.ext2_sb.s_group_desc == NULL) {
		printk ("EXT2-fs: not enough memory\n");
		goto failed_mount;
	}
	for (i = 0; i < db_count; i++) {
		block = descriptor_loc(sb, logic_sb_block, i);
		sbi->s_group_desc[i] = sb_bread(sb, block);
		if (!sbi->s_group_desc[i]) {
			for (j = 0; j < i; j++)
				brelse (sbi->s_group_desc[j]);
			kfree(sbi->s_group_desc);
			printk ("EXT2-fs: unable to read group descriptors\n");
			goto failed_mount;
		}
	}
	if (!ext2_check_descriptors (sb)) {
		printk ("EXT2-fs: group descriptors corrupted!\n");
		db_count = i;
		goto failed_mount2;
	}
	for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++) {
		sb->u.ext2_sb.s_inode_bitmap_number[i] = 0;
		sb->u.ext2_sb.s_inode_bitmap[i] = NULL;
		sb->u.ext2_sb.s_block_bitmap_number[i] = 0;
		sb->u.ext2_sb.s_block_bitmap[i] = NULL;
	}
	sb->u.ext2_sb.s_loaded_inode_bitmaps = 0;
	sb->u.ext2_sb.s_loaded_block_bitmaps = 0;
	sb->u.ext2_sb.s_gdb_count = db_count;
	/*
	 * set up enough so that it can read an inode
	 */
	sb->s_op = &ext2_sops;
	sb->s_root = d_alloc_root(iget(sb, EXT2_ROOT_INO));
	if (!sb->s_root || !S_ISDIR(sb->s_root->d_inode->i_mode) ||
	    !sb->s_root->d_inode->i_blocks || !sb->s_root->d_inode->i_size) {
		if (sb->s_root) {
			dput(sb->s_root);
			sb->s_root = NULL;
			printk(KERN_ERR "EXT2-fs: corrupt root inode, run e2fsck\n");
		} else
			printk(KERN_ERR "EXT2-fs: get root inode failed\n");
		goto failed_mount2;
	}
	ext2_setup_super (sb, es, sb->s_flags & MS_RDONLY);
	return sb;
failed_mount2:
	for (i = 0; i < db_count; i++)
		brelse(sb->u.ext2_sb.s_group_desc[i]);
	kfree(sb->u.ext2_sb.s_group_desc);
failed_mount:
	brelse(bh);
	return NULL;
}
Esempio n. 4
0
static int ext2_fill_super(struct super_block *sb, void *data, int silent)
{
	struct buffer_head * bh;
	struct ext2_sb_info * sbi;
	struct ext2_super_block * es;
	struct inode *root;
	unsigned long block;
	unsigned long sb_block = get_sb_block(&data);
	unsigned long logic_sb_block;
	unsigned long offset = 0;
	unsigned long def_mount_opts;
	long ret = -EINVAL;
	int blocksize = BLOCK_SIZE;
	int db_count;
	int i, j;
	__le32 features;
	int err;

	err = -ENOMEM;
	sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
	if (!sbi)
		goto failed_unlock;

	sbi->s_blockgroup_lock =
		kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL);
	if (!sbi->s_blockgroup_lock) {
		kfree(sbi);
		goto failed_unlock;
	}
	sb->s_fs_info = sbi;
	sbi->s_sb_block = sb_block;

	spin_lock_init(&sbi->s_lock);

	/*
	 * See what the current blocksize for the device is, and
	 * use that as the blocksize.  Otherwise (or if the blocksize
	 * is smaller than the default) use the default.
	 * This is important for devices that have a hardware
	 * sectorsize that is larger than the default.
	 */
	blocksize = sb_min_blocksize(sb, BLOCK_SIZE);
	if (!blocksize) {
		ext2_msg(sb, KERN_ERR, "error: unable to set blocksize");
		goto failed_sbi;
	}

	/*
	 * If the superblock doesn't start on a hardware sector boundary,
	 * calculate the offset.  
	 */
	if (blocksize != BLOCK_SIZE) {
		logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize;
		offset = (sb_block*BLOCK_SIZE) % blocksize;
	} else {
		logic_sb_block = sb_block;
	}

	if (!(bh = sb_bread(sb, logic_sb_block))) {
		ext2_msg(sb, KERN_ERR, "error: unable to read superblock");
		goto failed_sbi;
	}
	/*
	 * Note: s_es must be initialized as soon as possible because
	 *       some ext2 macro-instructions depend on its value
	 */
	es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
	sbi->s_es = es;
	sb->s_magic = le16_to_cpu(es->s_magic);

	if (sb->s_magic != EXT2_SUPER_MAGIC)
		goto cantfind_ext2;

	/* Set defaults before we parse the mount options */
	def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
	if (def_mount_opts & EXT2_DEFM_DEBUG)
		set_opt(sbi->s_mount_opt, DEBUG);
	if (def_mount_opts & EXT2_DEFM_BSDGROUPS)
		set_opt(sbi->s_mount_opt, GRPID);
	if (def_mount_opts & EXT2_DEFM_UID16)
		set_opt(sbi->s_mount_opt, NO_UID32);
#ifdef CONFIG_EXT2_FS_XATTR
	if (def_mount_opts & EXT2_DEFM_XATTR_USER)
		set_opt(sbi->s_mount_opt, XATTR_USER);
#endif
#ifdef CONFIG_EXT2_FS_POSIX_ACL
	if (def_mount_opts & EXT2_DEFM_ACL)
		set_opt(sbi->s_mount_opt, POSIX_ACL);
#endif
	
	if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC)
		set_opt(sbi->s_mount_opt, ERRORS_PANIC);
	else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_CONTINUE)
		set_opt(sbi->s_mount_opt, ERRORS_CONT);
	else
		set_opt(sbi->s_mount_opt, ERRORS_RO);

	sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
	sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
	
	set_opt(sbi->s_mount_opt, RESERVATION);

	if (!parse_options((char *) data, sb))
		goto failed_mount;

	sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
		((EXT2_SB(sb)->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ?
		 MS_POSIXACL : 0);

	ext2_xip_verify_sb(sb); /* see if bdev supports xip, unset
				    EXT2_MOUNT_XIP if not */

	if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV &&
	    (EXT2_HAS_COMPAT_FEATURE(sb, ~0U) ||
	     EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
	     EXT2_HAS_INCOMPAT_FEATURE(sb, ~0U)))
		ext2_msg(sb, KERN_WARNING,
			"warning: feature flags set on rev 0 fs, "
			"running e2fsck is recommended");
	/*
	 * Check feature flags regardless of the revision level, since we
	 * previously didn't change the revision level when setting the flags,
	 * so there is a chance incompat flags are set on a rev 0 filesystem.
	 */
	features = EXT2_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP);
	if (features) {
		ext2_msg(sb, KERN_ERR,	"error: couldn't mount because of "
		       "unsupported optional features (%x)",
			le32_to_cpu(features));
		goto failed_mount;
	}
	if (!(sb->s_flags & MS_RDONLY) &&
	    (features = EXT2_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))){
		ext2_msg(sb, KERN_ERR, "error: couldn't mount RDWR because of "
		       "unsupported optional features (%x)",
		       le32_to_cpu(features));
		goto failed_mount;
	}

	blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);

	if (ext2_use_xip(sb) && blocksize != PAGE_SIZE) {
		if (!silent)
			ext2_msg(sb, KERN_ERR,
				"error: unsupported blocksize for xip");
		goto failed_mount;
	}

	/* If the blocksize doesn't match, re-read the thing.. */
	if (sb->s_blocksize != blocksize) {
		brelse(bh);

		if (!sb_set_blocksize(sb, blocksize)) {
			ext2_msg(sb, KERN_ERR,
				"error: bad blocksize %d", blocksize);
			goto failed_sbi;
		}

		logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize;
		offset = (sb_block*BLOCK_SIZE) % blocksize;
		bh = sb_bread(sb, logic_sb_block);
		if(!bh) {
			ext2_msg(sb, KERN_ERR, "error: couldn't read"
				"superblock on 2nd try");
			goto failed_sbi;
		}
		es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
		sbi->s_es = es;
		if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) {
			ext2_msg(sb, KERN_ERR, "error: magic mismatch");
			goto failed_mount;
		}
	}

	sb->s_maxbytes = ext2_max_size(sb->s_blocksize_bits);
	sb->s_max_links = EXT2_LINK_MAX;

	if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) {
		sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE;
		sbi->s_first_ino = EXT2_GOOD_OLD_FIRST_INO;
	} else {
		sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
		sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
		if ((sbi->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE) ||
		    !is_power_of_2(sbi->s_inode_size) ||
		    (sbi->s_inode_size > blocksize)) {
			ext2_msg(sb, KERN_ERR,
				"error: unsupported inode size: %d",
				sbi->s_inode_size);
			goto failed_mount;
		}
	}

	sbi->s_frag_size = EXT2_MIN_FRAG_SIZE <<
				   le32_to_cpu(es->s_log_frag_size);
	if (sbi->s_frag_size == 0)
		goto cantfind_ext2;
	sbi->s_frags_per_block = sb->s_blocksize / sbi->s_frag_size;

	sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
	sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
	sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);

	if (EXT2_INODE_SIZE(sb) == 0)
		goto cantfind_ext2;
	sbi->s_inodes_per_block = sb->s_blocksize / EXT2_INODE_SIZE(sb);
	if (sbi->s_inodes_per_block == 0 || sbi->s_inodes_per_group == 0)
		goto cantfind_ext2;
	sbi->s_itb_per_group = sbi->s_inodes_per_group /
					sbi->s_inodes_per_block;
	sbi->s_desc_per_block = sb->s_blocksize /
					sizeof (struct ext2_group_desc);
	sbi->s_sbh = bh;
	sbi->s_mount_state = le16_to_cpu(es->s_state);
	sbi->s_addr_per_block_bits =
		ilog2 (EXT2_ADDR_PER_BLOCK(sb));
	sbi->s_desc_per_block_bits =
		ilog2 (EXT2_DESC_PER_BLOCK(sb));

	if (sb->s_magic != EXT2_SUPER_MAGIC)
		goto cantfind_ext2;

	if (sb->s_blocksize != bh->b_size) {
		if (!silent)
			ext2_msg(sb, KERN_ERR, "error: unsupported blocksize");
		goto failed_mount;
	}

	if (sb->s_blocksize != sbi->s_frag_size) {
		ext2_msg(sb, KERN_ERR,
			"error: fragsize %lu != blocksize %lu"
			"(not supported yet)",
			sbi->s_frag_size, sb->s_blocksize);
		goto failed_mount;
	}

	if (sbi->s_blocks_per_group > sb->s_blocksize * 8) {
		ext2_msg(sb, KERN_ERR,
			"error: #blocks per group too big: %lu",
			sbi->s_blocks_per_group);
		goto failed_mount;
	}
	if (sbi->s_frags_per_group > sb->s_blocksize * 8) {
		ext2_msg(sb, KERN_ERR,
			"error: #fragments per group too big: %lu",
			sbi->s_frags_per_group);
		goto failed_mount;
	}
	if (sbi->s_inodes_per_group > sb->s_blocksize * 8) {
		ext2_msg(sb, KERN_ERR,
			"error: #inodes per group too big: %lu",
			sbi->s_inodes_per_group);
		goto failed_mount;
	}

	if (EXT2_BLOCKS_PER_GROUP(sb) == 0)
		goto cantfind_ext2;
 	sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) -
 				le32_to_cpu(es->s_first_data_block) - 1)
 					/ EXT2_BLOCKS_PER_GROUP(sb)) + 1;
	db_count = (sbi->s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) /
		   EXT2_DESC_PER_BLOCK(sb);
	sbi->s_group_desc = kmalloc (db_count * sizeof (struct buffer_head *), GFP_KERNEL);
	if (sbi->s_group_desc == NULL) {
		ext2_msg(sb, KERN_ERR, "error: not enough memory");
		goto failed_mount;
	}
	bgl_lock_init(sbi->s_blockgroup_lock);
	sbi->s_debts = kcalloc(sbi->s_groups_count, sizeof(*sbi->s_debts), GFP_KERNEL);
	if (!sbi->s_debts) {
		ext2_msg(sb, KERN_ERR, "error: not enough memory");
		goto failed_mount_group_desc;
	}
	for (i = 0; i < db_count; i++) {
		block = descriptor_loc(sb, logic_sb_block, i);
		sbi->s_group_desc[i] = sb_bread(sb, block);
		if (!sbi->s_group_desc[i]) {
			for (j = 0; j < i; j++)
				brelse (sbi->s_group_desc[j]);
			ext2_msg(sb, KERN_ERR,
				"error: unable to read group descriptors");
			goto failed_mount_group_desc;
		}
	}
	if (!ext2_check_descriptors (sb)) {
		ext2_msg(sb, KERN_ERR, "group descriptors corrupted");
		goto failed_mount2;
	}
	sbi->s_gdb_count = db_count;
	get_random_bytes(&sbi->s_next_generation, sizeof(u32));
	spin_lock_init(&sbi->s_next_gen_lock);

	/* per fileystem reservation list head & lock */
	spin_lock_init(&sbi->s_rsv_window_lock);
	sbi->s_rsv_window_root = RB_ROOT;
	/*
	 * Add a single, static dummy reservation to the start of the
	 * reservation window list --- it gives us a placeholder for
	 * append-at-start-of-list which makes the allocation logic
	 * _much_ simpler.
	 */
	sbi->s_rsv_window_head.rsv_start = EXT2_RESERVE_WINDOW_NOT_ALLOCATED;
	sbi->s_rsv_window_head.rsv_end = EXT2_RESERVE_WINDOW_NOT_ALLOCATED;
	sbi->s_rsv_window_head.rsv_alloc_hit = 0;
	sbi->s_rsv_window_head.rsv_goal_size = 0;
	ext2_rsv_window_add(sb, &sbi->s_rsv_window_head);

	err = percpu_counter_init(&sbi->s_freeblocks_counter,
				ext2_count_free_blocks(sb));
	if (!err) {
		err = percpu_counter_init(&sbi->s_freeinodes_counter,
				ext2_count_free_inodes(sb));
	}
	if (!err) {
		err = percpu_counter_init(&sbi->s_dirs_counter,
				ext2_count_dirs(sb));
	}
	if (err) {
		ext2_msg(sb, KERN_ERR, "error: insufficient memory");
		goto failed_mount3;
	}
	/*
	 * set up enough so that it can read an inode
	 */
	sb->s_op = &ext2_sops;
	sb->s_export_op = &ext2_export_ops;
	sb->s_xattr = ext2_xattr_handlers;

#ifdef CONFIG_QUOTA
	sb->dq_op = &dquot_operations;
	sb->s_qcop = &dquot_quotactl_ops;
#endif

	root = ext2_iget(sb, EXT2_ROOT_INO);
	if (IS_ERR(root)) {
		ret = PTR_ERR(root);
		goto failed_mount3;
	}
	if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
		iput(root);
		ext2_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck");
		goto failed_mount3;
	}

	sb->s_root = d_make_root(root);
	if (!sb->s_root) {
		ext2_msg(sb, KERN_ERR, "error: get root inode failed");
		ret = -ENOMEM;
		goto failed_mount3;
	}
	if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL))
		ext2_msg(sb, KERN_WARNING,
			"warning: mounting ext3 filesystem as ext2");
	if (ext2_setup_super (sb, es, sb->s_flags & MS_RDONLY))
		sb->s_flags |= MS_RDONLY;
	ext2_write_super(sb);
	return 0;

cantfind_ext2:
	if (!silent)
		ext2_msg(sb, KERN_ERR,
			"error: can't find an ext2 filesystem on dev %s.",
			sb->s_id);
	goto failed_mount;
failed_mount3:
	percpu_counter_destroy(&sbi->s_freeblocks_counter);
	percpu_counter_destroy(&sbi->s_freeinodes_counter);
	percpu_counter_destroy(&sbi->s_dirs_counter);
failed_mount2:
	for (i = 0; i < db_count; i++)
		brelse(sbi->s_group_desc[i]);
failed_mount_group_desc:
	kfree(sbi->s_group_desc);
	kfree(sbi->s_debts);
failed_mount:
	brelse(bh);
failed_sbi:
	sb->s_fs_info = NULL;
	kfree(sbi->s_blockgroup_lock);
	kfree(sbi);
failed_unlock:
	return ret;
}
Esempio n. 5
0
static int ext2_fill_super(struct super_block *sb, void *data, int silent)
{
	struct buffer_head * bh;
	struct ext2_sb_info * sbi;
	struct ext2_super_block * es;
	struct inode *root;
	unsigned long block;
	unsigned long sb_block = get_sb_block(&data);
	unsigned long logic_sb_block;
	unsigned long offset = 0;
	unsigned long def_mount_opts;
	int blocksize = BLOCK_SIZE;
	int db_count;
	int i, j;
	__le32 features;

	sbi = kmalloc(sizeof(*sbi), GFP_KERNEL);
	if (!sbi)
		return -ENOMEM;
	sb->s_fs_info = sbi;
	memset(sbi, 0, sizeof(*sbi));

	/*
	 * See what the current blocksize for the device is, and
	 * use that as the blocksize.  Otherwise (or if the blocksize
	 * is smaller than the default) use the default.
	 * This is important for devices that have a hardware
	 * sectorsize that is larger than the default.
	 */
	blocksize = sb_min_blocksize(sb, BLOCK_SIZE);
	if (!blocksize) {
		printk ("EXT2-fs: unable to set blocksize\n");
		goto failed_sbi;
	}

	/*
	 * If the superblock doesn't start on a hardware sector boundary,
	 * calculate the offset.  
	 */
	if (blocksize != BLOCK_SIZE) {
		logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize;
		offset = (sb_block*BLOCK_SIZE) % blocksize;
	} else {
		logic_sb_block = sb_block;
	}

	if (!(bh = sb_bread(sb, logic_sb_block))) {
		printk ("EXT2-fs: unable to read superblock\n");
		goto failed_sbi;
	}
	/*
	 * Note: s_es must be initialized as soon as possible because
	 *       some ext2 macro-instructions depend on its value
	 */
	es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
	sbi->s_es = es;
	sb->s_magic = le16_to_cpu(es->s_magic);

	if (sb->s_magic != EXT2_SUPER_MAGIC)
		goto cantfind_ext2;

	/* Set defaults before we parse the mount options */
	def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
	if (def_mount_opts & EXT2_DEFM_DEBUG)
		set_opt(sbi->s_mount_opt, DEBUG);
	if (def_mount_opts & EXT2_DEFM_BSDGROUPS)
		set_opt(sbi->s_mount_opt, GRPID);
	if (def_mount_opts & EXT2_DEFM_UID16)
		set_opt(sbi->s_mount_opt, NO_UID32);
	if (def_mount_opts & EXT2_DEFM_XATTR_USER)
		set_opt(sbi->s_mount_opt, XATTR_USER);
	if (def_mount_opts & EXT2_DEFM_ACL)
		set_opt(sbi->s_mount_opt, POSIX_ACL);
	
	if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC)
		set_opt(sbi->s_mount_opt, ERRORS_PANIC);
	else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_RO)
		set_opt(sbi->s_mount_opt, ERRORS_RO);

	sbi->s_resuid = le16_to_cpu(es->s_def_resuid);
	sbi->s_resgid = le16_to_cpu(es->s_def_resgid);
	
	if (!parse_options ((char *) data, sbi))
		goto failed_mount;

	sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
		((EXT2_SB(sb)->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ?
		 MS_POSIXACL : 0);

	if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV &&
	    (EXT2_HAS_COMPAT_FEATURE(sb, ~0U) ||
	     EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) ||
	     EXT2_HAS_INCOMPAT_FEATURE(sb, ~0U)))
		printk("EXT2-fs warning: feature flags set on rev 0 fs, "
		       "running e2fsck is recommended\n");
	/*
	 * Check feature flags regardless of the revision level, since we
	 * previously didn't change the revision level when setting the flags,
	 * so there is a chance incompat flags are set on a rev 0 filesystem.
	 */
	features = EXT2_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP);
	if (features) {
		printk("EXT2-fs: %s: couldn't mount because of "
		       "unsupported optional features (%x).\n",
		       sb->s_id, le32_to_cpu(features));
		goto failed_mount;
	}
	if (!(sb->s_flags & MS_RDONLY) &&
	    (features = EXT2_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))){
		printk("EXT2-fs: %s: couldn't mount RDWR because of "
		       "unsupported optional features (%x).\n",
		       sb->s_id, le32_to_cpu(features));
		goto failed_mount;
	}

	blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);

	/* If the blocksize doesn't match, re-read the thing.. */
	if (sb->s_blocksize != blocksize) {
		brelse(bh);

		if (!sb_set_blocksize(sb, blocksize)) {
			printk(KERN_ERR "EXT2-fs: blocksize too small for device.\n");
			goto failed_sbi;
		}

		logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize;
		offset = (sb_block*BLOCK_SIZE) % blocksize;
		bh = sb_bread(sb, logic_sb_block);
		if(!bh) {
			printk("EXT2-fs: Couldn't read superblock on "
			       "2nd try.\n");
			goto failed_sbi;
		}
		es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
		sbi->s_es = es;
		if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) {
			printk ("EXT2-fs: Magic mismatch, very weird !\n");
			goto failed_mount;
		}
	}

	sb->s_maxbytes = ext2_max_size(sb->s_blocksize_bits);

	if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) {
		sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE;
		sbi->s_first_ino = EXT2_GOOD_OLD_FIRST_INO;
	} else {
		sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
		sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
		if ((sbi->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE) ||
		    (sbi->s_inode_size & (sbi->s_inode_size - 1)) ||
		    (sbi->s_inode_size > blocksize)) {
			printk ("EXT2-fs: unsupported inode size: %d\n",
				sbi->s_inode_size);
			goto failed_mount;
		}
	}

	sbi->s_frag_size = EXT2_MIN_FRAG_SIZE <<
				   le32_to_cpu(es->s_log_frag_size);
	if (sbi->s_frag_size == 0)
		goto cantfind_ext2;
	sbi->s_frags_per_block = sb->s_blocksize / sbi->s_frag_size;

	sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group);
	sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group);
	sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group);

	if (EXT2_INODE_SIZE(sb) == 0)
		goto cantfind_ext2;
	sbi->s_inodes_per_block = sb->s_blocksize / EXT2_INODE_SIZE(sb);
	if (sbi->s_inodes_per_block == 0)
		goto cantfind_ext2;
	sbi->s_itb_per_group = sbi->s_inodes_per_group /
					sbi->s_inodes_per_block;
	sbi->s_desc_per_block = sb->s_blocksize /
					sizeof (struct ext2_group_desc);
	sbi->s_sbh = bh;
	sbi->s_mount_state = le16_to_cpu(es->s_state);
	sbi->s_addr_per_block_bits =
		log2 (EXT2_ADDR_PER_BLOCK(sb));
	sbi->s_desc_per_block_bits =
		log2 (EXT2_DESC_PER_BLOCK(sb));

	if (sb->s_magic != EXT2_SUPER_MAGIC)
		goto cantfind_ext2;

	if (sb->s_blocksize != bh->b_size) {
		if (!silent)
			printk ("VFS: Unsupported blocksize on dev "
				"%s.\n", sb->s_id);
		goto failed_mount;
	}

	if (sb->s_blocksize != sbi->s_frag_size) {
		printk ("EXT2-fs: fragsize %lu != blocksize %lu (not supported yet)\n",
			sbi->s_frag_size, sb->s_blocksize);
		goto failed_mount;
	}

	if (sbi->s_blocks_per_group > sb->s_blocksize * 8) {
		printk ("EXT2-fs: #blocks per group too big: %lu\n",
			sbi->s_blocks_per_group);
		goto failed_mount;
	}
	if (sbi->s_frags_per_group > sb->s_blocksize * 8) {
		printk ("EXT2-fs: #fragments per group too big: %lu\n",
			sbi->s_frags_per_group);
		goto failed_mount;
	}
	if (sbi->s_inodes_per_group > sb->s_blocksize * 8) {
		printk ("EXT2-fs: #inodes per group too big: %lu\n",
			sbi->s_inodes_per_group);
		goto failed_mount;
	}

	if (EXT2_BLOCKS_PER_GROUP(sb) == 0)
		goto cantfind_ext2;
	sbi->s_groups_count = (le32_to_cpu(es->s_blocks_count) -
				        le32_to_cpu(es->s_first_data_block) +
				       EXT2_BLOCKS_PER_GROUP(sb) - 1) /
				       EXT2_BLOCKS_PER_GROUP(sb);
	db_count = (sbi->s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) /
		   EXT2_DESC_PER_BLOCK(sb);
	sbi->s_group_desc = kmalloc (db_count * sizeof (struct buffer_head *), GFP_KERNEL);
	if (sbi->s_group_desc == NULL) {
		printk ("EXT2-fs: not enough memory\n");
		goto failed_mount;
	}
	percpu_counter_init(&sbi->s_freeblocks_counter);
	percpu_counter_init(&sbi->s_freeinodes_counter);
	percpu_counter_init(&sbi->s_dirs_counter);
	bgl_lock_init(&sbi->s_blockgroup_lock);
	sbi->s_debts = kmalloc(sbi->s_groups_count * sizeof(*sbi->s_debts),
			       GFP_KERNEL);
	if (!sbi->s_debts) {
		printk ("EXT2-fs: not enough memory\n");
		goto failed_mount_group_desc;
	}
	memset(sbi->s_debts, 0, sbi->s_groups_count * sizeof(*sbi->s_debts));
	for (i = 0; i < db_count; i++) {
		block = descriptor_loc(sb, logic_sb_block, i);
		sbi->s_group_desc[i] = sb_bread(sb, block);
		if (!sbi->s_group_desc[i]) {
			for (j = 0; j < i; j++)
				brelse (sbi->s_group_desc[j]);
			printk ("EXT2-fs: unable to read group descriptors\n");
			goto failed_mount_group_desc;
		}
	}
	if (!ext2_check_descriptors (sb)) {
		printk ("EXT2-fs: group descriptors corrupted!\n");
		db_count = i;
		goto failed_mount2;
	}
	sbi->s_gdb_count = db_count;
	get_random_bytes(&sbi->s_next_generation, sizeof(u32));
	spin_lock_init(&sbi->s_next_gen_lock);
	/*
	 * set up enough so that it can read an inode
	 */
	sb->s_op = &ext2_sops;
	sb->s_export_op = &ext2_export_ops;
	sb->s_xattr = ext2_xattr_handlers;
	root = iget(sb, EXT2_ROOT_INO);
	sb->s_root = d_alloc_root(root);
	if (!sb->s_root) {
		iput(root);
		printk(KERN_ERR "EXT2-fs: get root inode failed\n");
		goto failed_mount2;
	}
	if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
		dput(sb->s_root);
		sb->s_root = NULL;
		printk(KERN_ERR "EXT2-fs: corrupt root inode, run e2fsck\n");
		goto failed_mount2;
	}
	if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL))
		ext2_warning(sb, __FUNCTION__,
			"mounting ext3 filesystem as ext2\n");
	ext2_setup_super (sb, es, sb->s_flags & MS_RDONLY);
	percpu_counter_mod(&sbi->s_freeblocks_counter,
				ext2_count_free_blocks(sb));
	percpu_counter_mod(&sbi->s_freeinodes_counter,
				ext2_count_free_inodes(sb));
	percpu_counter_mod(&sbi->s_dirs_counter,
				ext2_count_dirs(sb));
	return 0;

cantfind_ext2:
	if (!silent)
		printk("VFS: Can't find an ext2 filesystem on dev %s.\n",
		       sb->s_id);
	goto failed_mount;

failed_mount2:
	for (i = 0; i < db_count; i++)
		brelse(sbi->s_group_desc[i]);
failed_mount_group_desc:
	kfree(sbi->s_group_desc);
	kfree(sbi->s_debts);
failed_mount:
	brelse(bh);
failed_sbi:
	sb->s_fs_info = NULL;
	kfree(sbi);
	return -EINVAL;
}
Esempio n. 6
0
/*
 * This code assumes that the reserved blocks have already been marked in-use
 * during ext2fs_initialize(), so that they are not allocated for other
 * uses before we can add them to the resize inode (which has to come
 * after the creation of the inode table).
 */
errcode_t ext2fs_create_resize_inode(ext2_filsys fs)
{
	errcode_t		retval, retval2;
	struct ext2_super_block	*sb;
	struct ext2_inode	inode;
	__u32			*dindir_buf, *gdt_buf;
	int			rsv_add;
	unsigned long long	apb, inode_size;
	blk_t			dindir_blk, rsv_off, gdt_off, gdt_blk;
	int			dindir_dirty = 0, inode_dirty = 0;

	EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);

	sb = fs->super;

	retval = ext2fs_get_mem(2 * fs->blocksize, (void *)&dindir_buf);
	if (retval)
		goto out_free;
	gdt_buf = (__u32 *)((char *)dindir_buf + fs->blocksize);

	retval = ext2fs_read_inode(fs, EXT2_RESIZE_INO, &inode);
	if (retval)
		goto out_free;

	/* Maximum possible file size (we donly use the dindirect blocks) */
	apb = EXT2_ADDR_PER_BLOCK(sb);
	rsv_add = fs->blocksize / 512;
	if ((dindir_blk = inode.i_block[EXT2_DIND_BLOCK])) {
#ifdef RES_GDT_DEBUG
		printf("reading GDT dindir %u\n", dindir_blk);
#endif
		retval = ext2fs_read_ind_block(fs, dindir_blk, dindir_buf);
		if (retval)
			goto out_inode;
	} else {
		blk_t goal = 3 + sb->s_reserved_gdt_blocks +
			fs->desc_blocks + fs->inode_blocks_per_group;

		retval = ext2fs_alloc_block(fs, goal, 0, &dindir_blk);
		if (retval)
			goto out_free;
		inode.i_mode = LINUX_S_IFREG | 0600;
		inode.i_links_count = 1;
		inode.i_block[EXT2_DIND_BLOCK] = dindir_blk;
		inode.i_blocks = rsv_add;
		memset(dindir_buf, 0, fs->blocksize);
#ifdef RES_GDT_DEBUG
		printf("allocated GDT dindir %u\n", dindir_blk);
#endif
		dindir_dirty = inode_dirty = 1;
		inode_size = apb*apb + apb + EXT2_NDIR_BLOCKS;
		inode_size *= fs->blocksize;
		inode.i_size = inode_size & 0xFFFFFFFF;
		inode.i_size_high = (inode_size >> 32) & 0xFFFFFFFF;
		if (inode.i_size_high) {
			sb->s_feature_ro_compat |=
				EXT2_FEATURE_RO_COMPAT_LARGE_FILE;
		}
		inode.i_ctime = time(NULL);
	}

	for (rsv_off = 0, gdt_off = fs->desc_blocks,
	     gdt_blk = sb->s_first_data_block + 1 + fs->desc_blocks;
	     rsv_off < sb->s_reserved_gdt_blocks;
	     rsv_off++, gdt_off++, gdt_blk++) {
		unsigned int three = 1, five = 5, seven = 7;
		unsigned int grp, last = 0;
		int gdt_dirty = 0;

		gdt_off %= apb;
		if (!dindir_buf[gdt_off]) {
			/* FIXME XXX XXX
			blk_t new_blk;

			retval = ext2fs_new_block(fs, gdt_blk, 0, &new_blk);
			if (retval)
				goto out_free;
			if (new_blk != gdt_blk) {
				// XXX free block
				retval = -1; // XXX
			}
			*/
			gdt_dirty = dindir_dirty = inode_dirty = 1;
			memset(gdt_buf, 0, fs->blocksize);
			dindir_buf[gdt_off] = gdt_blk;
			inode.i_blocks += rsv_add;
#ifdef RES_GDT_DEBUG
			printf("added primary GDT block %u at %u[%u]\n",
			       gdt_blk, dindir_blk, gdt_off);
#endif
		} else if (dindir_buf[gdt_off] == gdt_blk) {
#ifdef RES_GDT_DEBUG
			printf("reading primary GDT block %u\n", gdt_blk);
#endif
			retval = ext2fs_read_ind_block(fs, gdt_blk, gdt_buf);
			if (retval)
				goto out_dindir;
		} else {
#ifdef RES_GDT_DEBUG
			printf("bad primary GDT %u != %u at %u[%u]\n",
			       dindir_buf[gdt_off], gdt_blk,dindir_blk,gdt_off);
#endif
			retval = EXT2_ET_RESIZE_INODE_CORRUPT;
			goto out_dindir;
		}

		while ((grp = list_backups(fs, &three, &five, &seven)) <
		       fs->group_desc_count) {
			blk_t expect = gdt_blk + grp * sb->s_blocks_per_group;

			if (!gdt_buf[last]) {
#ifdef RES_GDT_DEBUG
				printf("added backup GDT %u grp %[email protected]%u[%u]\n",
				       expect, grp, gdt_blk, last);
#endif
				gdt_buf[last] = expect;
				inode.i_blocks += rsv_add;
				gdt_dirty = inode_dirty = 1;
			} else if (gdt_buf[last] != expect) {
#ifdef RES_GDT_DEBUG
				printf("bad backup GDT %u != %u at %u[%u]\n",
				       gdt_buf[last], expect, gdt_blk, last);
#endif
				retval = EXT2_ET_RESIZE_INODE_CORRUPT;
				goto out_dindir;
			}
			last++;
		}
		if (gdt_dirty) {
#ifdef RES_GDT_DEBUG
			printf("writing primary GDT block %u\n", gdt_blk);
#endif
			retval = ext2fs_write_ind_block(fs, gdt_blk, gdt_buf);
			if (retval)
				goto out_dindir;
		}
	}

out_dindir:
	if (dindir_dirty) {
		retval2 = ext2fs_write_ind_block(fs, dindir_blk, dindir_buf);
		if (!retval)
			retval = retval2;
	}
out_inode:
#ifdef RES_GDT_DEBUG
	printf("inode.i_blocks = %u, i_size = %u\n", inode.i_blocks,
	       inode.i_size);
#endif
	if (inode_dirty) {
		inode.i_atime = inode.i_mtime = time(NULL);
		retval2 = ext2fs_write_inode(fs, EXT2_RESIZE_INO, &inode);
		if (!retval)
			retval = retval2;
	}
out_free:
	ext2fs_free_mem((void *)&dindir_buf);
	return retval;
}
Esempio n. 7
0
struct super_block * ext2_read_super (struct super_block * sb, void * data,
				      int silent)
{
	struct buffer_head * bh;
	struct ext2_super_block * es;
	unsigned long sb_block = 1;
	unsigned short resuid = EXT2_DEF_RESUID;
	unsigned short resgid = EXT2_DEF_RESGID;
	unsigned long logic_sb_block = 1;
	kdev_t dev = sb->s_dev;
	int db_count;
	int i, j;

	set_opt (sb->u.ext2_sb.s_mount_opt, CHECK_NORMAL);
	if (!parse_options ((char *) data, &sb_block, &resuid, &resgid,
	    &sb->u.ext2_sb.s_mount_opt)) {
		sb->s_dev = 0;
		return NULL;
	}

	MOD_INC_USE_COUNT;
	lock_super (sb);
	set_blocksize (dev, BLOCK_SIZE);
	if (!(bh = bread (dev, sb_block, BLOCK_SIZE))) {
		sb->s_dev = 0;
		unlock_super (sb);
		printk ("EXT2-fs: unable to read superblock\n");
		MOD_DEC_USE_COUNT;
		return NULL;
	}
	/*
	 * Note: s_es must be initialized s_es as soon as possible because
	 * some ext2 macro-instructions depend on its value
	 */
	es = (struct ext2_super_block *) bh->b_data;
	sb->u.ext2_sb.s_es = es;
	sb->s_magic = es->s_magic;
	if (sb->s_magic != EXT2_SUPER_MAGIC) {
		if (!silent)
			printk ("VFS: Can't find an ext2 filesystem on dev "
				"%s.\n", kdevname(dev));
	failed_mount:
		sb->s_dev = 0;
		unlock_super (sb);
		if (bh)
			brelse(bh);
		MOD_DEC_USE_COUNT;
		return NULL;
	}
	if (es->s_rev_level > EXT2_GOOD_OLD_REV) {
		if (es->s_feature_incompat & ~EXT2_FEATURE_INCOMPAT_SUPP) {
			printk("EXT2-fs: %s: couldn't mount because of "
			       "unsupported optional features.\n", 
			       kdevname(dev));
			goto failed_mount;
		}
		if (!(sb->s_flags & MS_RDONLY) &&
		    (es->s_feature_ro_compat & ~EXT2_FEATURE_RO_COMPAT_SUPP)) {
			printk("EXT2-fs: %s: couldn't mount RDWR because of "
			       "unsupported optional features.\n", 
			       kdevname(dev));
			goto failed_mount;
		}
	}
	sb->s_blocksize_bits = sb->u.ext2_sb.s_es->s_log_block_size + 10;
	sb->s_blocksize = 1 << sb->s_blocksize_bits;
	if (sb->s_blocksize != BLOCK_SIZE && 
	    (sb->s_blocksize == 1024 || sb->s_blocksize == 2048 ||  
	     sb->s_blocksize == 4096)) {
		unsigned long offset;

		brelse (bh);
		set_blocksize (dev, sb->s_blocksize);
		logic_sb_block = (sb_block*BLOCK_SIZE) / sb->s_blocksize;
		offset = (sb_block*BLOCK_SIZE) % sb->s_blocksize;
		bh = bread (dev, logic_sb_block, sb->s_blocksize);
		if(!bh) {
			printk("EXT2-fs: Couldn't read superblock on "
			       "2nd try.\n");
			goto failed_mount;
		}
		es = (struct ext2_super_block *) (((char *)bh->b_data) + offset);
		sb->u.ext2_sb.s_es = es;
		if (es->s_magic != EXT2_SUPER_MAGIC) {
			printk ("EXT2-fs: Magic mismatch, very weird !\n");
			goto failed_mount;
		}
	}
	if (es->s_rev_level == EXT2_GOOD_OLD_REV) {
		sb->u.ext2_sb.s_inode_size = EXT2_GOOD_OLD_INODE_SIZE;
		sb->u.ext2_sb.s_first_ino = EXT2_GOOD_OLD_FIRST_INO;
	} else {
		sb->u.ext2_sb.s_inode_size = es->s_inode_size;
		sb->u.ext2_sb.s_first_ino = es->s_first_ino;
		if (sb->u.ext2_sb.s_inode_size != EXT2_GOOD_OLD_INODE_SIZE) {
			printk ("EXT2-fs: unsupported inode size: %d\n",
				sb->u.ext2_sb.s_inode_size);
			goto failed_mount;
		}
	}
	sb->u.ext2_sb.s_frag_size = EXT2_MIN_FRAG_SIZE <<
				   es->s_log_frag_size;
	if (sb->u.ext2_sb.s_frag_size)
		sb->u.ext2_sb.s_frags_per_block = sb->s_blocksize /
						  sb->u.ext2_sb.s_frag_size;
	else
		sb->s_magic = 0;
	sb->u.ext2_sb.s_blocks_per_group = es->s_blocks_per_group;
	sb->u.ext2_sb.s_frags_per_group = es->s_frags_per_group;
	sb->u.ext2_sb.s_inodes_per_group = es->s_inodes_per_group;
	sb->u.ext2_sb.s_inodes_per_block = sb->s_blocksize /
					   EXT2_INODE_SIZE(sb);
	sb->u.ext2_sb.s_itb_per_group = sb->u.ext2_sb.s_inodes_per_group /
				        sb->u.ext2_sb.s_inodes_per_block;
	sb->u.ext2_sb.s_desc_per_block = sb->s_blocksize /
					 sizeof (struct ext2_group_desc);
	sb->u.ext2_sb.s_sbh = bh;
	if (resuid != EXT2_DEF_RESUID)
		sb->u.ext2_sb.s_resuid = resuid;
	else
		sb->u.ext2_sb.s_resuid = es->s_def_resuid;
	if (resgid != EXT2_DEF_RESGID)
		sb->u.ext2_sb.s_resgid = resgid;
	else
		sb->u.ext2_sb.s_resgid = es->s_def_resgid;
	sb->u.ext2_sb.s_mount_state = es->s_state;
	sb->u.ext2_sb.s_rename_lock = 0;
	sb->u.ext2_sb.s_rename_wait = NULL;
	sb->u.ext2_sb.s_addr_per_block_bits =
		log2 (EXT2_ADDR_PER_BLOCK(sb));
	sb->u.ext2_sb.s_desc_per_block_bits =
		log2 (EXT2_DESC_PER_BLOCK(sb));
	if (sb->s_magic != EXT2_SUPER_MAGIC) {
		if (!silent)
			printk ("VFS: Can't find an ext2 filesystem on dev "
				"%s.\n",
				kdevname(dev));
		goto failed_mount;
	}
	if (sb->s_blocksize != bh->b_size) {
		if (!silent)
			printk ("VFS: Unsupported blocksize on dev "
				"%s.\n", kdevname(dev));
		goto failed_mount;
	}

	if (sb->s_blocksize != sb->u.ext2_sb.s_frag_size) {
		printk ("EXT2-fs: fragsize %lu != blocksize %lu (not supported yet)\n",
			sb->u.ext2_sb.s_frag_size, sb->s_blocksize);
		goto failed_mount;
	}

	if (sb->u.ext2_sb.s_blocks_per_group > sb->s_blocksize * 8) {
		printk ("EXT2-fs: #blocks per group too big: %lu\n",
			sb->u.ext2_sb.s_blocks_per_group);
		goto failed_mount;
	}
	if (sb->u.ext2_sb.s_frags_per_group > sb->s_blocksize * 8) {
		printk ("EXT2-fs: #fragments per group too big: %lu\n",
			sb->u.ext2_sb.s_frags_per_group);
		goto failed_mount;
	}
	if (sb->u.ext2_sb.s_inodes_per_group > sb->s_blocksize * 8) {
		printk ("EXT2-fs: #inodes per group too big: %lu\n",
			sb->u.ext2_sb.s_inodes_per_group);
		goto failed_mount;
	}

	sb->u.ext2_sb.s_groups_count = (es->s_blocks_count -
				        es->s_first_data_block +
				       EXT2_BLOCKS_PER_GROUP(sb) - 1) /
				       EXT2_BLOCKS_PER_GROUP(sb);
	db_count = (sb->u.ext2_sb.s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) /
		   EXT2_DESC_PER_BLOCK(sb);
	sb->u.ext2_sb.s_group_desc = kmalloc (db_count * sizeof (struct buffer_head *), GFP_KERNEL);
	if (sb->u.ext2_sb.s_group_desc == NULL) {
		printk ("EXT2-fs: not enough memory\n");
		goto failed_mount;
	}
	for (i = 0; i < db_count; i++) {
		sb->u.ext2_sb.s_group_desc[i] = bread (dev, logic_sb_block + i + 1,
						       sb->s_blocksize);
		if (!sb->u.ext2_sb.s_group_desc[i]) {
			for (j = 0; j < i; j++)
				brelse (sb->u.ext2_sb.s_group_desc[j]);
			kfree_s (sb->u.ext2_sb.s_group_desc,
				 db_count * sizeof (struct buffer_head *));
			printk ("EXT2-fs: unable to read group descriptors\n");
			goto failed_mount;
		}
	}
	if (!ext2_check_descriptors (sb)) {
		for (j = 0; j < db_count; j++)
			brelse (sb->u.ext2_sb.s_group_desc[j]);
		kfree_s (sb->u.ext2_sb.s_group_desc,
			 db_count * sizeof (struct buffer_head *));
		printk ("EXT2-fs: group descriptors corrupted !\n");
		goto failed_mount;
	}
	for (i = 0; i < EXT2_MAX_GROUP_LOADED; i++) {
		sb->u.ext2_sb.s_inode_bitmap_number[i] = 0;
		sb->u.ext2_sb.s_inode_bitmap[i] = NULL;
		sb->u.ext2_sb.s_block_bitmap_number[i] = 0;
		sb->u.ext2_sb.s_block_bitmap[i] = NULL;
	}
	sb->u.ext2_sb.s_loaded_inode_bitmaps = 0;
	sb->u.ext2_sb.s_loaded_block_bitmaps = 0;
	sb->u.ext2_sb.s_db_per_group = db_count;
	unlock_super (sb);
	/*
	 * set up enough so that it can read an inode
	 */
	sb->s_dev = dev;
	sb->s_op = &ext2_sops;
	if (!(sb->s_mounted = iget (sb, EXT2_ROOT_INO))) {
		sb->s_dev = 0;
		for (i = 0; i < db_count; i++)
			if (sb->u.ext2_sb.s_group_desc[i])
				brelse (sb->u.ext2_sb.s_group_desc[i]);
		kfree_s (sb->u.ext2_sb.s_group_desc,
			 db_count * sizeof (struct buffer_head *));
		brelse (bh);
		printk ("EXT2-fs: get root inode failed\n");
		MOD_DEC_USE_COUNT;
		return NULL;
	}
	ext2_setup_super (sb, es);
	return sb;
}
Esempio n. 8
0
errcode_t ext2fs_initialize(const char *name, int flags,
                            struct ext2_super_block *param,
                            io_manager manager, ext2_filsys *ret_fs)
{
    ext2_filsys	fs;
    errcode_t	retval;
    struct ext2_super_block *super;
    int		frags_per_block;
    unsigned int	rem;
    unsigned int	overhead = 0;
    unsigned int	ipg;
    dgrp_t		i;
    blk_t		numblocks;
    int		rsv_gdt;
    int		io_flags;
    char		*buf;
    char		c;

    if (!param || !param->s_blocks_count)
        return EXT2_ET_INVALID_ARGUMENT;

    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 | EXT2_FLAG_RW;
    fs->umask = 022;
#ifdef WORDS_BIGENDIAN
    fs->flags |= EXT2_FLAG_SWAP_BYTES;
#endif
    io_flags = IO_FLAG_RW;
    if (flags & EXT2_FLAG_EXCLUSIVE)
        io_flags |= IO_FLAG_EXCLUSIVE;
    retval = manager->open(name, io_flags, &fs->io);
    if (retval)
        goto cleanup;
    fs->image_io = fs->io;
    fs->io->app_data = fs;
    retval = ext2fs_get_mem(strlen(name)+1, &fs->device_name);
    if (retval)
        goto cleanup;

    strcpy(fs->device_name, name);
    retval = ext2fs_get_mem(SUPERBLOCK_SIZE, &super);
    if (retval)
        goto cleanup;
    fs->super = super;

    memset(super, 0, SUPERBLOCK_SIZE);

#define set_field(field, default) (super->field = param->field ? \
				   param->field : (default))

    super->s_magic = EXT2_SUPER_MAGIC;
    super->s_state = EXT2_VALID_FS;

    set_field(s_log_block_size, 0);	/* default blocksize: 1024 bytes */
    set_field(s_log_frag_size, 0); /* default fragsize: 1024 bytes */
    set_field(s_first_data_block, super->s_log_block_size ? 0 : 1);
    set_field(s_max_mnt_count, EXT2_DFL_MAX_MNT_COUNT);
    set_field(s_errors, EXT2_ERRORS_DEFAULT);
    set_field(s_feature_compat, 0);
    set_field(s_feature_incompat, 0);
    set_field(s_feature_ro_compat, 0);
    set_field(s_first_meta_bg, 0);
    if (super->s_feature_incompat & ~EXT2_LIB_FEATURE_INCOMPAT_SUPP) {
        retval = EXT2_ET_UNSUPP_FEATURE;
        goto cleanup;
    }
    if (super->s_feature_ro_compat & ~EXT2_LIB_FEATURE_RO_COMPAT_SUPP) {
        retval = EXT2_ET_RO_UNSUPP_FEATURE;
        goto cleanup;
    }

    set_field(s_rev_level, EXT2_GOOD_OLD_REV);
    if (super->s_rev_level >= EXT2_DYNAMIC_REV) {
        set_field(s_first_ino, EXT2_GOOD_OLD_FIRST_INO);
        set_field(s_inode_size, EXT2_GOOD_OLD_INODE_SIZE);
    }

    set_field(s_checkinterval, EXT2_DFL_CHECKINTERVAL);
    super->s_mkfs_time = super->s_lastcheck = fs->now ? fs->now : time(NULL);

    super->s_creator_os = CREATOR_OS;

    fs->blocksize = EXT2_BLOCK_SIZE(super);
    fs->fragsize = EXT2_FRAG_SIZE(super);
    frags_per_block = fs->blocksize / fs->fragsize;

    /* default: (fs->blocksize*8) blocks/group, up to 2^16 (GDT limit) */
    set_field(s_blocks_per_group, fs->blocksize * 8);
    if (super->s_blocks_per_group > EXT2_MAX_BLOCKS_PER_GROUP(super))
        super->s_blocks_per_group = EXT2_MAX_BLOCKS_PER_GROUP(super);
    super->s_frags_per_group = super->s_blocks_per_group * frags_per_block;

    super->s_blocks_count = param->s_blocks_count;
    super->s_r_blocks_count = param->s_r_blocks_count;
    if (super->s_r_blocks_count >= param->s_blocks_count) {
        retval = EXT2_ET_INVALID_ARGUMENT;
        goto cleanup;
    }

    /*
     * If we're creating an external journal device, we don't need
     * to bother with the rest.
     */
    if (super->s_feature_incompat & EXT3_FEATURE_INCOMPAT_JOURNAL_DEV) {
        fs->group_desc_count = 0;
        ext2fs_mark_super_dirty(fs);
        *ret_fs = fs;
        return 0;
    }

retry:
    fs->group_desc_count = ext2fs_div_ceil(super->s_blocks_count -
                                           super->s_first_data_block,
                                           EXT2_BLOCKS_PER_GROUP(super));
    if (fs->group_desc_count == 0) {
        retval = EXT2_ET_TOOSMALL;
        goto cleanup;
    }
    fs->desc_blocks = ext2fs_div_ceil(fs->group_desc_count,
                                      EXT2_DESC_PER_BLOCK(super));

    i = fs->blocksize >= 4096 ? 1 : 4096 / fs->blocksize;
    set_field(s_inodes_count, super->s_blocks_count / i);

    /*
     * Make sure we have at least EXT2_FIRST_INO + 1 inodes, so
     * that we have enough inodes for the filesystem(!)
     */
    if (super->s_inodes_count < EXT2_FIRST_INODE(super)+1)
        super->s_inodes_count = EXT2_FIRST_INODE(super)+1;

    /*
     * There should be at least as many inodes as the user
     * requested.  Figure out how many inodes per group that
     * should be.  But make sure that we don't allocate more than
     * one bitmap's worth of inodes each group.
     */
    ipg = ext2fs_div_ceil(super->s_inodes_count, fs->group_desc_count);
    if (ipg > fs->blocksize * 8) {
        if (super->s_blocks_per_group >= 256) {
            /* Try again with slightly different parameters */
            super->s_blocks_per_group -= 8;
            super->s_blocks_count = param->s_blocks_count;
            super->s_frags_per_group = super->s_blocks_per_group *
                                       frags_per_block;
            goto retry;
        } else
            return EXT2_ET_TOO_MANY_INODES;
    }

    if (ipg > (unsigned) EXT2_MAX_INODES_PER_GROUP(super))
        ipg = EXT2_MAX_INODES_PER_GROUP(super);

ipg_retry:
    super->s_inodes_per_group = ipg;

    /*
     * Make sure the number of inodes per group completely fills
     * the inode table blocks in the descriptor.  If not, add some
     * additional inodes/group.  Waste not, want not...
     */
    fs->inode_blocks_per_group = (((super->s_inodes_per_group *
                                    EXT2_INODE_SIZE(super)) +
                                   EXT2_BLOCK_SIZE(super) - 1) /
                                  EXT2_BLOCK_SIZE(super));
    super->s_inodes_per_group = ((fs->inode_blocks_per_group *
                                  EXT2_BLOCK_SIZE(super)) /
                                 EXT2_INODE_SIZE(super));
    /*
     * Finally, make sure the number of inodes per group is a
     * multiple of 8.  This is needed to simplify the bitmap
     * splicing code.
     */
    super->s_inodes_per_group &= ~7;
    fs->inode_blocks_per_group = (((super->s_inodes_per_group *
                                    EXT2_INODE_SIZE(super)) +
                                   EXT2_BLOCK_SIZE(super) - 1) /
                                  EXT2_BLOCK_SIZE(super));

    /*
     * adjust inode count to reflect the adjusted inodes_per_group
     */
    if ((__u64)super->s_inodes_per_group * fs->group_desc_count > ~0U) {
        ipg--;
        goto ipg_retry;
    }
    super->s_inodes_count = super->s_inodes_per_group *
                            fs->group_desc_count;
    super->s_free_inodes_count = super->s_inodes_count;

    /*
     * check the number of reserved group descriptor table blocks
     */
    if (super->s_feature_compat & EXT2_FEATURE_COMPAT_RESIZE_INODE)
        rsv_gdt = calc_reserved_gdt_blocks(fs);
    else
        rsv_gdt = 0;
    set_field(s_reserved_gdt_blocks, rsv_gdt);
    if (super->s_reserved_gdt_blocks > EXT2_ADDR_PER_BLOCK(super)) {
        retval = EXT2_ET_RES_GDT_BLOCKS;
        goto cleanup;
    }

    /*
     * Overhead is the number of bookkeeping blocks per group.  It
     * includes the superblock backup, the group descriptor
     * backups, the inode bitmap, the block bitmap, and the inode
     * table.
     */

    overhead = (int) (2 + fs->inode_blocks_per_group);

    if (ext2fs_bg_has_super(fs, fs->group_desc_count - 1))
        overhead += 1 + fs->desc_blocks + super->s_reserved_gdt_blocks;

    /* This can only happen if the user requested too many inodes */
    if (overhead > super->s_blocks_per_group)
        return EXT2_ET_TOO_MANY_INODES;

    /*
     * See if the last group is big enough to support the
     * necessary data structures.  If not, we need to get rid of
     * it.
     */
    rem = ((super->s_blocks_count - super->s_first_data_block) %
           super->s_blocks_per_group);
    if ((fs->group_desc_count == 1) && rem && (rem < overhead))
        return EXT2_ET_TOOSMALL;
    if (rem && (rem < overhead+50)) {
        super->s_blocks_count -= rem;
        goto retry;
    }

    /*
     * At this point we know how big the filesystem will be.  So
     * we can do any and all allocations that depend on the block
     * count.
     */

    retval = ext2fs_get_mem(strlen(fs->device_name) + 80, &buf);
    if (retval)
        goto cleanup;

    sprintf(buf, "block bitmap for %s", fs->device_name);
    retval = ext2fs_allocate_block_bitmap(fs, buf, &fs->block_map);
    if (retval)
        goto cleanup;

    sprintf(buf, "inode bitmap for %s", fs->device_name);
    retval = ext2fs_allocate_inode_bitmap(fs, buf, &fs->inode_map);
    if (retval)
        goto cleanup;

    ext2fs_free_mem(&buf);

    retval = ext2fs_get_mem((size_t) fs->desc_blocks * fs->blocksize,
                            &fs->group_desc);
    if (retval)
        goto cleanup;

    memset(fs->group_desc, 0, (size_t) fs->desc_blocks * fs->blocksize);

    /*
     * Reserve the superblock and group descriptors for each
     * group, and fill in the correct group statistics for group.
     * Note that although the block bitmap, inode bitmap, and
     * inode table have not been allocated (and in fact won't be
     * by this routine), they are accounted for nevertheless.
     */
    super->s_free_blocks_count = 0;
    for (i = 0; i < fs->group_desc_count; i++) {
        numblocks = ext2fs_reserve_super_and_bgd(fs, i, fs->block_map);

        super->s_free_blocks_count += numblocks;
        fs->group_desc[i].bg_free_blocks_count = numblocks;
        fs->group_desc[i].bg_free_inodes_count =
            fs->super->s_inodes_per_group;
        fs->group_desc[i].bg_used_dirs_count = 0;
    }

    c = (char) 255;
    if (((int) c) == -1) {
        super->s_flags |= EXT2_FLAGS_SIGNED_HASH;
    } else {
        super->s_flags |= EXT2_FLAGS_UNSIGNED_HASH;
    }

    ext2fs_mark_super_dirty(fs);
    ext2fs_mark_bb_dirty(fs);
    ext2fs_mark_ib_dirty(fs);

    io_channel_set_blksize(fs->io, fs->blocksize);

    *ret_fs = fs;
    return 0;
cleanup:
    ext2fs_free(fs);
    return retval;
}
Esempio n. 9
0
errcode_t ext2fs_initialize(const char *name, int flags,
			    struct ext2_super_block *param,
			    io_manager manager, ext2_filsys *ret_fs)
{
	ext2_filsys	fs;
	errcode_t	retval;
	struct ext2_super_block *super;
	unsigned int	rem;
	unsigned int	overhead = 0;
	unsigned int	ipg;
	dgrp_t		i;
	blk64_t		free_blocks;
	blk_t		numblocks;
	int		rsv_gdt;
	int		csum_flag;
	int		bigalloc_flag;
	int		io_flags;
	unsigned	reserved_inos;
	char		*buf = 0;
	char		c;
	double		reserved_ratio;

	if (!param || !ext2fs_blocks_count(param))
		return EXT2_ET_INVALID_ARGUMENT;

	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 | EXT2_FLAG_RW;
	fs->umask = 022;
	fs->default_bitmap_type = EXT2FS_BMAP64_RBTREE;
#ifdef WORDS_BIGENDIAN
	fs->flags |= EXT2_FLAG_SWAP_BYTES;
#endif
	io_flags = IO_FLAG_RW;
	if (flags & EXT2_FLAG_EXCLUSIVE)
		io_flags |= IO_FLAG_EXCLUSIVE;
	if (flags & EXT2_FLAG_DIRECT_IO)
		io_flags |= IO_FLAG_DIRECT_IO;
	retval = manager->open(name, io_flags, &fs->io);
	if (retval)
		goto cleanup;
	fs->image_io = fs->io;
	fs->io->app_data = fs;
	retval = ext2fs_get_mem(strlen(name)+1, &fs->device_name);
	if (retval)
		goto cleanup;

	strcpy(fs->device_name, name);
	retval = ext2fs_get_mem(SUPERBLOCK_SIZE, &super);
	if (retval)
		goto cleanup;
	fs->super = super;

	memset(super, 0, SUPERBLOCK_SIZE);

#define set_field(field, default) (super->field = param->field ? \
				   param->field : (default))
#define assign_field(field)	(super->field = param->field)

	super->s_magic = EXT2_SUPER_MAGIC;
	super->s_state = EXT2_VALID_FS;

	bigalloc_flag = EXT2_HAS_RO_COMPAT_FEATURE(param,
				   EXT4_FEATURE_RO_COMPAT_BIGALLOC);

	assign_field(s_log_block_size);

	if (bigalloc_flag) {
		set_field(s_log_cluster_size, super->s_log_block_size+4);
		if (super->s_log_block_size > super->s_log_cluster_size) {
			retval = EXT2_ET_INVALID_ARGUMENT;
			goto cleanup;
		}
	} else
		super->s_log_cluster_size = super->s_log_block_size;

	set_field(s_first_data_block, super->s_log_cluster_size ? 0 : 1);
	set_field(s_max_mnt_count, 0);
	set_field(s_errors, EXT2_ERRORS_DEFAULT);
	set_field(s_feature_compat, 0);
	set_field(s_feature_incompat, 0);
	set_field(s_feature_ro_compat, 0);
	set_field(s_default_mount_opts, 0);
	set_field(s_first_meta_bg, 0);
	set_field(s_raid_stride, 0);		/* default stride size: 0 */
	set_field(s_raid_stripe_width, 0);	/* default stripe width: 0 */
	set_field(s_log_groups_per_flex, 0);
	set_field(s_flags, 0);
	assign_field(s_backup_bgs[0]);
	assign_field(s_backup_bgs[1]);
	if (super->s_feature_incompat & ~EXT2_LIB_FEATURE_INCOMPAT_SUPP) {
		retval = EXT2_ET_UNSUPP_FEATURE;
		goto cleanup;
	}
	if (super->s_feature_ro_compat & ~EXT2_LIB_FEATURE_RO_COMPAT_SUPP) {
		retval = EXT2_ET_RO_UNSUPP_FEATURE;
		goto cleanup;
	}

	set_field(s_rev_level, EXT2_GOOD_OLD_REV);
	if (super->s_rev_level >= EXT2_DYNAMIC_REV) {
		set_field(s_first_ino, EXT2_GOOD_OLD_FIRST_INO);
		set_field(s_inode_size, EXT2_GOOD_OLD_INODE_SIZE);
		if (super->s_inode_size >= sizeof(struct ext2_inode_large)) {
			int extra_isize = sizeof(struct ext2_inode_large) -
				EXT2_GOOD_OLD_INODE_SIZE;
			set_field(s_min_extra_isize, extra_isize);
			set_field(s_want_extra_isize, extra_isize);
		}
	} else {
		super->s_first_ino = EXT2_GOOD_OLD_FIRST_INO;
		super->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE;
	}

	set_field(s_checkinterval, 0);
	super->s_mkfs_time = super->s_lastcheck = fs->now ? fs->now : time(NULL);

	super->s_creator_os = CREATOR_OS;

	fs->fragsize = fs->blocksize = EXT2_BLOCK_SIZE(super);
	fs->cluster_ratio_bits = super->s_log_cluster_size -
		super->s_log_block_size;

	if (bigalloc_flag) {
		unsigned long long bpg;

		if (param->s_blocks_per_group &&
		    param->s_clusters_per_group &&
		    ((param->s_clusters_per_group * EXT2FS_CLUSTER_RATIO(fs)) !=
		     param->s_blocks_per_group)) {
			retval = EXT2_ET_INVALID_ARGUMENT;
			goto cleanup;
		}
		if (param->s_clusters_per_group)
			assign_field(s_clusters_per_group);
		else if (param->s_blocks_per_group)
			super->s_clusters_per_group = 
				param->s_blocks_per_group /
				EXT2FS_CLUSTER_RATIO(fs);
		else if (super->s_log_cluster_size + 15 < 32)
			super->s_clusters_per_group = fs->blocksize * 8;
		else
			super->s_clusters_per_group = (fs->blocksize - 1) * 8;
		if (super->s_clusters_per_group > EXT2_MAX_CLUSTERS_PER_GROUP(super))
			super->s_clusters_per_group = EXT2_MAX_CLUSTERS_PER_GROUP(super);
		bpg = EXT2FS_C2B(fs,
			(unsigned long long) super->s_clusters_per_group);
		if (bpg >= (((unsigned long long) 1) << 32)) {
			retval = EXT2_ET_INVALID_ARGUMENT;
			goto cleanup;
		}
		super->s_blocks_per_group = bpg;
	} else {
		set_field(s_blocks_per_group, fs->blocksize * 8);
		if (super->s_blocks_per_group > EXT2_MAX_BLOCKS_PER_GROUP(super))
			super->s_blocks_per_group = EXT2_MAX_BLOCKS_PER_GROUP(super);
		super->s_clusters_per_group = super->s_blocks_per_group;
	}

	ext2fs_blocks_count_set(super, ext2fs_blocks_count(param) &
				~((blk64_t) EXT2FS_CLUSTER_MASK(fs)));
	ext2fs_r_blocks_count_set(super, ext2fs_r_blocks_count(param));
	if (ext2fs_r_blocks_count(super) >= ext2fs_blocks_count(param)) {
		retval = EXT2_ET_INVALID_ARGUMENT;
		goto cleanup;
	}

	set_field(s_mmp_update_interval, 0);

	/*
	 * If we're creating an external journal device, we don't need
	 * to bother with the rest.
	 */
	if (super->s_feature_incompat & EXT3_FEATURE_INCOMPAT_JOURNAL_DEV) {
		fs->group_desc_count = 0;
		ext2fs_mark_super_dirty(fs);
		*ret_fs = fs;
		return 0;
	}

retry:
	fs->group_desc_count = (dgrp_t) ext2fs_div64_ceil(
		ext2fs_blocks_count(super) - super->s_first_data_block,
		EXT2_BLOCKS_PER_GROUP(super));
	if (fs->group_desc_count == 0) {
		retval = EXT2_ET_TOOSMALL;
		goto cleanup;
	}

	set_field(s_desc_size,
		  super->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT ?
		  EXT2_MIN_DESC_SIZE_64BIT : 0);

	fs->desc_blocks = ext2fs_div_ceil(fs->group_desc_count,
					  EXT2_DESC_PER_BLOCK(super));

	i = fs->blocksize >= 4096 ? 1 : 4096 / fs->blocksize;

	if (super->s_feature_incompat & EXT4_FEATURE_INCOMPAT_64BIT &&
	    (ext2fs_blocks_count(super) / i) > (1ULL << 32))
		set_field(s_inodes_count, ~0U);
	else
		set_field(s_inodes_count, ext2fs_blocks_count(super) / i);

	/*
	 * Make sure we have at least EXT2_FIRST_INO + 1 inodes, so
	 * that we have enough inodes for the filesystem(!)
	 */
	if (super->s_inodes_count < EXT2_FIRST_INODE(super)+1)
		super->s_inodes_count = EXT2_FIRST_INODE(super)+1;

	/*
	 * There should be at least as many inodes as the user
	 * requested.  Figure out how many inodes per group that
	 * should be.  But make sure that we don't allocate more than
	 * one bitmap's worth of inodes each group.
	 */
	ipg = ext2fs_div_ceil(super->s_inodes_count, fs->group_desc_count);
	if (ipg > fs->blocksize * 8) {
		if (!bigalloc_flag && super->s_blocks_per_group >= 256) {
			/* Try again with slightly different parameters */
			super->s_blocks_per_group -= 8;
			ext2fs_blocks_count_set(super,
						ext2fs_blocks_count(param));
			super->s_clusters_per_group = super->s_blocks_per_group;
			goto retry;
		} else {
			retval = EXT2_ET_TOO_MANY_INODES;
			goto cleanup;
		}
	}

	if (ipg > (unsigned) EXT2_MAX_INODES_PER_GROUP(super))
		ipg = EXT2_MAX_INODES_PER_GROUP(super);

ipg_retry:
	super->s_inodes_per_group = ipg;

	/*
	 * Make sure the number of inodes per group completely fills
	 * the inode table blocks in the descriptor.  If not, add some
	 * additional inodes/group.  Waste not, want not...
	 */
	fs->inode_blocks_per_group = (((super->s_inodes_per_group *
					EXT2_INODE_SIZE(super)) +
				       EXT2_BLOCK_SIZE(super) - 1) /
				      EXT2_BLOCK_SIZE(super));
	super->s_inodes_per_group = ((fs->inode_blocks_per_group *
				      EXT2_BLOCK_SIZE(super)) /
				     EXT2_INODE_SIZE(super));
	/*
	 * Finally, make sure the number of inodes per group is a
	 * multiple of 8.  This is needed to simplify the bitmap
	 * splicing code.
	 */
	if (super->s_inodes_per_group < 8)
		super->s_inodes_per_group = 8;
	super->s_inodes_per_group &= ~7;
	fs->inode_blocks_per_group = (((super->s_inodes_per_group *
					EXT2_INODE_SIZE(super)) +
				       EXT2_BLOCK_SIZE(super) - 1) /
				      EXT2_BLOCK_SIZE(super));

	/*
	 * adjust inode count to reflect the adjusted inodes_per_group
	 */
	if ((__u64)super->s_inodes_per_group * fs->group_desc_count > ~0U) {
		ipg--;
		goto ipg_retry;
	}
	super->s_inodes_count = super->s_inodes_per_group *
		fs->group_desc_count;
	super->s_free_inodes_count = super->s_inodes_count;

	/*
	 * check the number of reserved group descriptor table blocks
	 */
	if (super->s_feature_compat & EXT2_FEATURE_COMPAT_RESIZE_INODE)
		rsv_gdt = calc_reserved_gdt_blocks(fs);
	else
		rsv_gdt = 0;
	set_field(s_reserved_gdt_blocks, rsv_gdt);
	if (super->s_reserved_gdt_blocks > EXT2_ADDR_PER_BLOCK(super)) {
		retval = EXT2_ET_RES_GDT_BLOCKS;
		goto cleanup;
	}

	/*
	 * Calculate the maximum number of bookkeeping blocks per
	 * group.  It includes the superblock, the block group
	 * descriptors, the block bitmap, the inode bitmap, the inode
	 * table, and the reserved gdt blocks.
	 */
	overhead = (int) (3 + fs->inode_blocks_per_group +
			  fs->desc_blocks + super->s_reserved_gdt_blocks);

	/* This can only happen if the user requested too many inodes */
	if (overhead > super->s_blocks_per_group) {
		retval = EXT2_ET_TOO_MANY_INODES;
		goto cleanup;
	}

	/*
	 * See if the last group is big enough to support the
	 * necessary data structures.  If not, we need to get rid of
	 * it.  We need to recalculate the overhead for the last block
	 * group, since it might or might not have a superblock
	 * backup.
	 */
	overhead = (int) (2 + fs->inode_blocks_per_group);
	if (ext2fs_bg_has_super(fs, fs->group_desc_count - 1))
		overhead += 1 + fs->desc_blocks + super->s_reserved_gdt_blocks;
	rem = ((ext2fs_blocks_count(super) - super->s_first_data_block) %
	       super->s_blocks_per_group);
	if ((fs->group_desc_count == 1) && rem && (rem < overhead)) {
		retval = EXT2_ET_TOOSMALL;
		goto cleanup;
	}
	if (rem && (rem < overhead+50)) {
		ext2fs_blocks_count_set(super, ext2fs_blocks_count(super) -
					rem);
		/*
		 * If blocks count is changed, we need to recalculate
		 * reserved blocks count not to exceed 50%.
		 */
		reserved_ratio = 100.0 * ext2fs_r_blocks_count(param) /
			ext2fs_blocks_count(param);
		ext2fs_r_blocks_count_set(super, reserved_ratio *
			ext2fs_blocks_count(super) / 100.0);

		goto retry;
	}

	/*
	 * At this point we know how big the filesystem will be.  So
	 * we can do any and all allocations that depend on the block
	 * count.
	 */

	/* Set up the locations of the backup superblocks */
	if (super->s_feature_compat & EXT4_FEATURE_COMPAT_SPARSE_SUPER2) {
		if (super->s_backup_bgs[0] >= fs->group_desc_count)
			super->s_backup_bgs[0] = fs->group_desc_count - 1;
		if (super->s_backup_bgs[1] >= fs->group_desc_count)
			super->s_backup_bgs[1] = fs->group_desc_count - 1;
		if (super->s_backup_bgs[0] == super->s_backup_bgs[1])
			super->s_backup_bgs[1] = 0;
		if (super->s_backup_bgs[0] > super->s_backup_bgs[1]) {
			__u32 t = super->s_backup_bgs[0];
			super->s_backup_bgs[0] = super->s_backup_bgs[1];
			super->s_backup_bgs[1] = t;
		}
	}

	retval = ext2fs_get_mem(strlen(fs->device_name) + 80, &buf);
	if (retval)
		goto cleanup;

	strcpy(buf, "block bitmap for ");
	strcat(buf, fs->device_name);
	retval = ext2fs_allocate_subcluster_bitmap(fs, buf, &fs->block_map);
	if (retval)
		goto cleanup;

	strcpy(buf, "inode bitmap for ");
	strcat(buf, fs->device_name);
	retval = ext2fs_allocate_inode_bitmap(fs, buf, &fs->inode_map);
	if (retval)
		goto cleanup;

	ext2fs_free_mem(&buf);

	retval = ext2fs_get_array(fs->desc_blocks, fs->blocksize,
				&fs->group_desc);
	if (retval)
		goto cleanup;

	memset(fs->group_desc, 0, (size_t) fs->desc_blocks * fs->blocksize);

	/*
	 * Reserve the superblock and group descriptors for each
	 * group, and fill in the correct group statistics for group.
	 * Note that although the block bitmap, inode bitmap, and
	 * inode table have not been allocated (and in fact won't be
	 * by this routine), they are accounted for nevertheless.
	 *
	 * If FLEX_BG meta-data grouping is used, only account for the
	 * superblock and group descriptors (the inode tables and
	 * bitmaps will be accounted for when allocated).
	 */
	free_blocks = 0;
	csum_flag = ext2fs_has_group_desc_csum(fs);
	reserved_inos = super->s_first_ino;
	for (i = 0; i < fs->group_desc_count; i++) {
		/*
		 * Don't set the BLOCK_UNINIT group for the last group
		 * because the block bitmap needs to be padded.
		 */
		if (csum_flag) {
			if (i != fs->group_desc_count - 1)
				ext2fs_bg_flags_set(fs, i,
						    EXT2_BG_BLOCK_UNINIT);
			ext2fs_bg_flags_set(fs, i, EXT2_BG_INODE_UNINIT);
			numblocks = super->s_inodes_per_group;
			if (reserved_inos) {
				if (numblocks > reserved_inos) {
					numblocks -= reserved_inos;
					reserved_inos = 0;
				} else {
					reserved_inos -= numblocks;
					numblocks = 0;
				}
			}
			ext2fs_bg_itable_unused_set(fs, i, numblocks);
		}
		numblocks = ext2fs_reserve_super_and_bgd(fs, i, fs->block_map);
		if (fs->super->s_log_groups_per_flex)
			numblocks += 2 + fs->inode_blocks_per_group;

		free_blocks += numblocks;
		ext2fs_bg_free_blocks_count_set(fs, i, numblocks);
		ext2fs_bg_free_inodes_count_set(fs, i, fs->super->s_inodes_per_group);
		ext2fs_bg_used_dirs_count_set(fs, i, 0);
		ext2fs_group_desc_csum_set(fs, i);
	}
	free_blocks &= ~EXT2FS_CLUSTER_MASK(fs);
	ext2fs_free_blocks_count_set(super, free_blocks);

	c = (char) 255;
	if (((int) c) == -1) {
		super->s_flags |= EXT2_FLAGS_SIGNED_HASH;
	} else {
		super->s_flags |= EXT2_FLAGS_UNSIGNED_HASH;
	}

	ext2fs_mark_super_dirty(fs);
	ext2fs_mark_bb_dirty(fs);
	ext2fs_mark_ib_dirty(fs);

	io_channel_set_blksize(fs->io, fs->blocksize);

	*ret_fs = fs;
	return 0;
cleanup:
	free(buf);
	ext2fs_free(fs);
	return retval;
}
Esempio n. 10
0
static fsw_status_t fsw_ext2_volume_mount(struct fsw_ext2_volume *vol)
{
    fsw_status_t    status;
    void            *buffer;
    fsw_u32         blocksize;
    fsw_u32         groupcnt, groupno, gdesc_per_block, gdesc_bno, gdesc_index;
    struct ext2_group_desc *gdesc;
    int             i;
    struct fsw_string s;

    // allocate memory to keep the superblock around
    status = fsw_alloc(sizeof(struct ext2_super_block), &vol->sb);
    if (status)
        return status;

    // read the superblock into its buffer
    fsw_set_blocksize(vol, EXT2_SUPERBLOCK_BLOCKSIZE, EXT2_SUPERBLOCK_BLOCKSIZE);
    status = fsw_block_get(vol, EXT2_SUPERBLOCK_BLOCKNO, 0, &buffer);
    if (status)
        return status;
    fsw_memcpy(vol->sb, buffer, sizeof(struct ext2_super_block));
    fsw_block_release(vol, EXT2_SUPERBLOCK_BLOCKNO, buffer);

    // check the superblock
    if (vol->sb->s_magic != EXT2_SUPER_MAGIC)
        return FSW_UNSUPPORTED;
    if (vol->sb->s_rev_level != EXT2_GOOD_OLD_REV &&
        vol->sb->s_rev_level != EXT2_DYNAMIC_REV)
        return FSW_UNSUPPORTED;
    if (vol->sb->s_rev_level == EXT2_DYNAMIC_REV &&
        (vol->sb->s_feature_incompat & ~(EXT2_FEATURE_INCOMPAT_FILETYPE | EXT3_FEATURE_INCOMPAT_RECOVER)))
        return FSW_UNSUPPORTED;

    /*
     if (vol->sb->s_rev_level == EXT2_DYNAMIC_REV &&
         (vol->sb->s_feature_incompat & EXT3_FEATURE_INCOMPAT_RECOVER))
     Print(L"Ext2 WARNING: This ext3 file system needs recovery, trying to use it anyway.\n");
     */

    // set real blocksize
    blocksize = EXT2_BLOCK_SIZE(vol->sb);
    fsw_set_blocksize(vol, blocksize, blocksize);

    // get other info from superblock
    vol->ind_bcnt = EXT2_ADDR_PER_BLOCK(vol->sb);
    vol->dind_bcnt = vol->ind_bcnt * vol->ind_bcnt;
    vol->inode_size = EXT2_INODE_SIZE(vol->sb);

    for (i = 0; i < 16; i++)
        if (vol->sb->s_volume_name[i] == 0)
            break;
    s.type = FSW_STRING_TYPE_ISO88591;
    s.size = s.len = i;
    s.data = vol->sb->s_volume_name;
    status = fsw_strdup_coerce(&vol->g.label, vol->g.host_string_type, &s);
    if (status)
        return status;

    // read the group descriptors to get inode table offsets
    groupcnt = ((vol->sb->s_inodes_count - 2) / vol->sb->s_inodes_per_group) + 1;
    gdesc_per_block = (vol->g.phys_blocksize / sizeof(struct ext2_group_desc));

    status = fsw_alloc(sizeof(fsw_u32) * groupcnt, &vol->inotab_bno);
    if (status)
        return status;
    for (groupno = 0; groupno < groupcnt; groupno++) {
        // get the block group descriptor
        gdesc_bno = (vol->sb->s_first_data_block + 1) + groupno / gdesc_per_block;
        gdesc_index = groupno % gdesc_per_block;
        status = fsw_block_get(vol, gdesc_bno, 1, (void **)&buffer);
        if (status)
            return status;
        gdesc = ((struct ext2_group_desc *)(buffer)) + gdesc_index;
        vol->inotab_bno[groupno] = gdesc->bg_inode_table;
        fsw_block_release(vol, gdesc_bno, buffer);
    }

    // setup the root dnode
    status = fsw_dnode_create_root(vol, EXT2_ROOT_INO, &vol->g.root);
    if (status)
        return status;

    FSW_MSG_DEBUG((FSW_MSGSTR("fsw_ext2_volume_mount: success, blocksize %d\n"), blocksize));

    return FSW_SUCCESS;
}
Esempio n. 11
0
static void parse_extended_opts(struct ext2_super_block *param, 
				const char *opts)
{
	char	*buf, *token, *next, *p, *arg, *badopt = "";
	int	len;
	int	r_usage = 0;

	len = strlen(opts);
	buf = malloc(len+1);
	if (!buf) {
		fprintf(stderr,
			_("Couldn't allocate memory to parse options!\n"));
		exit(1);
	}
	strcpy(buf, opts);
	for (token = buf; token && *token; token = next) {
		p = strchr(token, ',');
		next = 0;
		if (p) {
			*p = 0;
			next = p+1;
		}
		arg = strchr(token, '=');
		if (arg) {
			*arg = 0;
			arg++;
		}
		if (strcmp(token, "stride") == 0) {
			if (!arg) {
				r_usage++;
				badopt = token;
				continue;
			}
			param->s_raid_stride = strtoul(arg, &p, 0);
			if (*p || (param->s_raid_stride == 0)) {
				fprintf(stderr,
					_("Invalid stride parameter: %s\n"),
					arg);
				r_usage++;
				continue;
			}
		} else if (strcmp(token, "stripe-width") == 0 ||
			   strcmp(token, "stripe_width") == 0) {
			if (!arg) {
				r_usage++;
				badopt = token;
				continue;
			}
			param->s_raid_stripe_width = strtoul(arg, &p, 0);
			if (*p || (param->s_raid_stripe_width == 0)) {
				fprintf(stderr,
					_("Invalid stripe-width parameter: %s\n"),
					arg);
				r_usage++;
				continue;
			}
		} else if (!strcmp(token, "resize")) {
			unsigned long resize, bpg, rsv_groups;
			unsigned long group_desc_count, desc_blocks;
			unsigned int gdpb, blocksize;
			int rsv_gdb;

			if (!arg) {
				r_usage++;
				badopt = token;
				continue;
			}

			resize = parse_num_blocks(arg, 
						  param->s_log_block_size);

			if (resize == 0) {
				fprintf(stderr, 
					_("Invalid resize parameter: %s\n"),
					arg);
				r_usage++;
				continue;
			}
			if (resize <= param->s_blocks_count) {
				fprintf(stderr, 
					_("The resize maximum must be greater "
					  "than the filesystem size.\n"));
				r_usage++;
				continue;
			}

			blocksize = EXT2_BLOCK_SIZE(param);
			bpg = param->s_blocks_per_group;
			if (!bpg)
				bpg = blocksize * 8;
			gdpb = blocksize / sizeof(struct ext2_group_desc);
			group_desc_count = 
				ext2fs_div_ceil(param->s_blocks_count, bpg);
			desc_blocks = (group_desc_count +
				       gdpb - 1) / gdpb;
			rsv_groups = ext2fs_div_ceil(resize, bpg);
			rsv_gdb = ext2fs_div_ceil(rsv_groups, gdpb) - 
				desc_blocks;
			if (rsv_gdb > (int) EXT2_ADDR_PER_BLOCK(param))
				rsv_gdb = EXT2_ADDR_PER_BLOCK(param);

			if (rsv_gdb > 0) {
				if (param->s_rev_level == EXT2_GOOD_OLD_REV) {
					fprintf(stderr, 
	_("On-line resizing not supported with revision 0 filesystems\n"));
					free(buf);
					exit(1);
				}
				param->s_feature_compat |=
					EXT2_FEATURE_COMPAT_RESIZE_INODE;

				param->s_reserved_gdt_blocks = rsv_gdb;
			}
		} else if (!strcmp(token, "test_fs")) {
			param->s_flags |= EXT2_FLAGS_TEST_FILESYS;
		} else {
			r_usage++;
			badopt = token;
		}
	}
	if (r_usage) {
		fprintf(stderr, _("\nBad option(s) specified: %s\n\n"
			"Extended options are separated by commas, "
			"and may take an argument which\n"
			"\tis set off by an equals ('=') sign.\n\n"
			"Valid extended options are:\n"
			"\tstride=<RAID per-disk data chunk in blocks>\n"
			"\tstripe-width=<RAID stride * data disks in blocks>\n"
			"\tresize=<resize maximum size in blocks>\n\n"
			"\ttest_fs\n"),
			badopt);
		free(buf);
		exit(1);
	}
	if (param->s_raid_stride &&
	    (param->s_raid_stripe_width % param->s_raid_stride) != 0)
		fprintf(stderr, _("\nWarning: RAID stripe-width %u not an even "
				  "multiple of stride %u.\n\n"),
			param->s_raid_stripe_width, param->s_raid_stride);

	free(buf);
}