X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=qemu%2Froms%2Fopenbios%2Ffs%2Fext2%2Fext2_utils.c;fp=qemu%2Froms%2Fopenbios%2Ffs%2Fext2%2Fext2_utils.c;h=64563c826806fcafcc4adc798ece698d31169475;hb=e44e3482bdb4d0ebde2d8b41830ac2cdb07948fb;hp=0000000000000000000000000000000000000000;hpb=9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00;p=kvmfornfv.git

diff --git a/qemu/roms/openbios/fs/ext2/ext2_utils.c b/qemu/roms/openbios/fs/ext2/ext2_utils.c
new file mode 100644
index 000000000..64563c826
--- /dev/null
+++ b/qemu/roms/openbios/fs/ext2/ext2_utils.c
@@ -0,0 +1,332 @@
+/*
+ *
+ * (c) 2008-2009 Laurent Vivier <Laurent@lvivier.info>
+ *
+ * This file has been copied from EMILE, http://emile.sf.net
+ *
+ */
+
+#include "libext2.h"
+#include "ext2_utils.h"
+#include "libopenbios/bindings.h"
+#include "libc/diskio.h"
+#include "libc/byteorder.h"
+
+int ext2_probe(int fd, long long offset)
+{
+	struct ext2_super_block *super;
+
+	super = (struct ext2_super_block*)malloc(sizeof(struct ext2_super_block));
+	seek_io(fd, 2 * 512 + offset);
+	read_io(fd, super, sizeof (*super));
+
+	if (__le16_to_cpu(super->s_magic) != EXT2_SUPER_MAGIC) {
+		free(super);
+		return 0;
+	}
+
+	free(super);
+	return -1;
+}
+
+void ext2_get_super(int fd, struct ext2_super_block *super)
+{
+	seek_io(fd, 2 * 512);
+	read_io(fd, super, sizeof (*super));
+
+	super->s_inodes_count = __le32_to_cpu(super->s_inodes_count);
+	super->s_blocks_count = __le32_to_cpu(super->s_blocks_count);
+	super->s_r_blocks_count = __le32_to_cpu(super->s_r_blocks_count);
+	super->s_free_blocks_count = __le32_to_cpu(super->s_free_blocks_count);
+	super->s_free_inodes_count = __le32_to_cpu(super->s_free_inodes_count);
+	super->s_first_data_block = __le32_to_cpu(super->s_first_data_block);
+	super->s_log_block_size = __le32_to_cpu(super->s_log_block_size);
+	super->s_log_frag_size = __le32_to_cpu(super->s_log_frag_size);
+	super->s_blocks_per_group = __le32_to_cpu(super->s_blocks_per_group);
+	super->s_frags_per_group = __le32_to_cpu(super->s_frags_per_group);
+	super->s_inodes_per_group = __le32_to_cpu(super->s_inodes_per_group);
+	super->s_mtime = __le32_to_cpu(super->s_mtime);
+	super->s_wtime = __le32_to_cpu(super->s_wtime);
+	super->s_mnt_count = __le16_to_cpu(super->s_mnt_count);
+	super->s_max_mnt_count = __le16_to_cpu(super->s_max_mnt_count);
+	super->s_magic = __le16_to_cpu(super->s_magic);
+	super->s_state = __le16_to_cpu(super->s_state);
+	super->s_errors = __le16_to_cpu(super->s_errors);
+	super->s_minor_rev_level = __le16_to_cpu(super->s_minor_rev_level);
+	super->s_lastcheck = __le32_to_cpu(super->s_lastcheck);
+	super->s_checkinterval = __le32_to_cpu(super->s_checkinterval);
+	super->s_creator_os = __le32_to_cpu(super->s_creator_os);
+	super->s_rev_level = __le32_to_cpu(super->s_rev_level);
+	super->s_def_resuid = __le16_to_cpu(super->s_def_resuid);
+	super->s_def_resgid = __le16_to_cpu(super->s_def_resgid);
+	super->s_first_ino = __le32_to_cpu(super->s_first_ino);
+	super->s_inode_size = __le16_to_cpu(super->s_inode_size);
+	super->s_block_group_nr = __le16_to_cpu(super->s_block_group_nr);
+	super->s_feature_compat = __le32_to_cpu(super->s_feature_compat);
+	super->s_feature_incompat = __le32_to_cpu(super->s_feature_incompat);
+	super->s_feature_ro_compat = __le32_to_cpu(super->s_feature_ro_compat);
+	super->s_algorithm_usage_bitmap =
+				__le32_to_cpu(super->s_algorithm_usage_bitmap);
+	super->s_journal_inum = __le32_to_cpu(super->s_journal_inum);
+	super->s_journal_dev = __le32_to_cpu(super->s_journal_dev);
+	super->s_last_orphan = __le32_to_cpu(super->s_last_orphan);
+	super->s_hash_seed[0] = __le32_to_cpu(super->s_hash_seed[0]);
+	super->s_hash_seed[1] = __le32_to_cpu(super->s_hash_seed[1]);
+	super->s_hash_seed[2] = __le32_to_cpu(super->s_hash_seed[2]);
+	super->s_hash_seed[3] = __le32_to_cpu(super->s_hash_seed[3]);
+	super->s_default_mount_opts =
+				__le32_to_cpu(super->s_default_mount_opts);
+	super->s_first_meta_bg = __le32_to_cpu(super->s_first_meta_bg);
+}
+
+void ext2_read_block(ext2_VOLUME* volume, unsigned int fsblock)
+{
+	long long offset;
+
+	if (fsblock == volume->current)
+		return;
+
+	volume->current = fsblock;
+	offset = fsblock * EXT2_BLOCK_SIZE(volume->super);
+
+	seek_io(volume->fd, offset);
+	read_io(volume->fd, volume->buffer, EXT2_BLOCK_SIZE(volume->super));
+}
+
+void ext2_get_group_desc(ext2_VOLUME* volume,
+		   int group_id, struct ext2_group_desc *gdp)
+{
+	unsigned int block, offset;
+	struct ext2_group_desc *le_gdp;
+
+	block = 1 + volume->super->s_first_data_block;
+	block += group_id / EXT2_DESC_PER_BLOCK(volume->super);
+	ext2_read_block(volume,  block);
+
+	offset = group_id % EXT2_DESC_PER_BLOCK(volume->super);
+	offset *= sizeof(*gdp);
+
+	le_gdp = (struct ext2_group_desc *)(volume->buffer + offset);
+
+	gdp->bg_block_bitmap = __le32_to_cpu(le_gdp->bg_block_bitmap);
+	gdp->bg_inode_bitmap = __le32_to_cpu(le_gdp->bg_inode_bitmap);
+	gdp->bg_inode_table = __le32_to_cpu(le_gdp->bg_inode_table);
+	gdp->bg_free_blocks_count = __le16_to_cpu(le_gdp->bg_free_blocks_count);
+	gdp->bg_free_inodes_count = __le16_to_cpu(le_gdp->bg_free_inodes_count);
+	gdp->bg_used_dirs_count = __le16_to_cpu(le_gdp->bg_used_dirs_count);
+}
+
+int ext2_get_inode(ext2_VOLUME* volume,
+		    unsigned int ino, struct ext2_inode *inode)
+{
+	struct ext2_group_desc desc;
+	unsigned int block;
+	unsigned int group_id;
+	unsigned int offset;
+	struct ext2_inode *le_inode;
+	int i;
+
+	ino--;
+
+	group_id = ino / EXT2_INODES_PER_GROUP(volume->super);
+	ext2_get_group_desc(volume, group_id, &desc);
+
+	ino %= EXT2_INODES_PER_GROUP(volume->super);
+
+	block = desc.bg_inode_table;
+	block += ino / (EXT2_BLOCK_SIZE(volume->super) /
+			EXT2_INODE_SIZE(volume->super));
+	ext2_read_block(volume, block);
+
+	offset = ino % (EXT2_BLOCK_SIZE(volume->super) /
+			EXT2_INODE_SIZE(volume->super));
+	offset *= EXT2_INODE_SIZE(volume->super);
+
+	le_inode = (struct ext2_inode *)(volume->buffer + offset);
+
+	inode->i_mode = __le16_to_cpu(le_inode->i_mode);
+	inode->i_uid = __le16_to_cpu(le_inode->i_uid);
+	inode->i_size = __le32_to_cpu(le_inode->i_size);
+	inode->i_atime = __le32_to_cpu(le_inode->i_atime);
+	inode->i_ctime = __le32_to_cpu(le_inode->i_ctime);
+	inode->i_mtime = __le32_to_cpu(le_inode->i_mtime);
+	inode->i_dtime = __le32_to_cpu(le_inode->i_dtime);
+	inode->i_gid = __le16_to_cpu(le_inode->i_gid);
+	inode->i_links_count = __le16_to_cpu(le_inode->i_links_count);
+	inode->i_blocks = __le32_to_cpu(le_inode->i_blocks);
+	inode->i_flags = __le32_to_cpu(le_inode->i_flags);
+	if (S_ISLNK(inode->i_mode)) {
+		memcpy(inode->i_block, le_inode->i_block, EXT2_N_BLOCKS * 4);
+	} else {
+		for (i = 0; i < EXT2_N_BLOCKS; i++)
+			inode->i_block[i] = __le32_to_cpu(le_inode->i_block[i]);
+        }
+	inode->i_generation = __le32_to_cpu(le_inode->i_generation);
+	inode->i_file_acl = __le32_to_cpu(le_inode->i_file_acl);
+	inode->i_dir_acl = __le32_to_cpu(le_inode->i_dir_acl);
+	inode->i_faddr = __le32_to_cpu(le_inode->i_faddr);
+	inode->osd2.linux2.l_i_frag = le_inode->osd2.linux2.l_i_frag;
+	inode->osd2.linux2.l_i_fsize = le_inode->osd2.linux2.l_i_fsize;
+	inode->osd2.linux2.l_i_uid_high =
+			__le16_to_cpu(le_inode->osd2.linux2.l_i_uid_high);
+	inode->osd2.linux2.l_i_gid_high =
+			__le16_to_cpu(le_inode->osd2.linux2.l_i_gid_high);
+	return 0;
+}
+
+unsigned int ext2_get_block_addr(ext2_VOLUME* volume, struct ext2_inode *inode,
+				 unsigned int logical)
+{
+	unsigned int physical;
+	unsigned int addr_per_block;
+
+	/* direct */
+
+	if (logical < EXT2_NDIR_BLOCKS) {
+		physical = inode->i_block[logical];
+		return physical;
+	}
+
+	/* indirect */
+
+	logical -= EXT2_NDIR_BLOCKS;
+
+	addr_per_block = EXT2_ADDR_PER_BLOCK (volume->super);
+	if (logical < addr_per_block) {
+		ext2_read_block(volume, inode->i_block[EXT2_IND_BLOCK]);
+		physical = __le32_to_cpu(((unsigned int *)volume->buffer)[logical]);
+		return physical;
+	}
+
+	/* double indirect */
+
+	logical -=  addr_per_block;
+
+	if (logical < addr_per_block * addr_per_block) {
+		ext2_read_block(volume, inode->i_block[EXT2_DIND_BLOCK]);
+		physical = __le32_to_cpu(((unsigned int *)volume->buffer)
+						[logical / addr_per_block]);
+		ext2_read_block(volume, physical);
+		physical = __le32_to_cpu(((unsigned int *)volume->buffer)
+						[logical % addr_per_block]);
+		return physical;
+	}
+
+	/* triple indirect */
+
+	logical -= addr_per_block * addr_per_block;
+	ext2_read_block(volume, inode->i_block[EXT2_DIND_BLOCK]);
+	physical = __le32_to_cpu(((unsigned int *)volume->buffer)
+				[logical / (addr_per_block * addr_per_block)]);
+	ext2_read_block(volume, physical);
+	logical = logical % (addr_per_block * addr_per_block);
+	physical = __le32_to_cpu(((unsigned int *)volume->buffer)[logical / addr_per_block]);
+	ext2_read_block(volume, physical);
+	physical = __le32_to_cpu(((unsigned int *)volume->buffer)[logical % addr_per_block]);
+	return physical;
+}
+
+int ext2_read_data(ext2_VOLUME* volume, struct ext2_inode *inode,
+		   off_t offset, char *buffer, size_t length)
+{
+	unsigned int logical, physical;
+	int blocksize = EXT2_BLOCK_SIZE(volume->super);
+	int shift;
+	size_t read;
+
+	if (offset >= inode->i_size)
+		return -1;
+
+	if (offset + length >= inode->i_size)
+		length = inode->i_size - offset;
+
+	read = 0;
+	logical = offset / blocksize;
+	shift = offset % blocksize;
+
+	if (shift) {
+		physical = ext2_get_block_addr(volume, inode, logical);
+		ext2_read_block(volume, physical);
+
+		if (length < blocksize - shift) {
+			memcpy(buffer, volume->buffer + shift, length);
+			return length;
+		}
+		read += blocksize - shift;
+		memcpy(buffer, volume->buffer + shift, read);
+
+		buffer += read;
+		length -= read;
+		logical++;
+	}
+
+	while (length) {
+		physical = ext2_get_block_addr(volume, inode, logical);
+		ext2_read_block(volume, physical);
+
+		if (length < blocksize) {
+			memcpy(buffer, volume->buffer, length);
+			read += length;
+			return read;
+		}
+		memcpy(buffer, volume->buffer, blocksize);
+
+		buffer += blocksize;
+		length -= blocksize;
+		read += blocksize;
+		logical++;
+	}
+
+	return read;
+}
+
+off_t ext2_dir_entry(ext2_VOLUME *volume, struct ext2_inode *inode,
+		     off_t index, struct ext2_dir_entry_2 *entry)
+{
+	int ret;
+
+	ret = ext2_read_data(volume, inode, index,
+			     (char*)entry, sizeof(*entry));
+	if (ret == -1)
+		return -1;
+
+        entry->inode = __le32_to_cpu(entry->inode);
+        entry->rec_len = __le16_to_cpu(entry->rec_len);
+	return index + entry->rec_len;
+}
+
+unsigned int ext2_seek_name(ext2_VOLUME *volume, const char *name)
+{
+	struct ext2_inode inode;
+	int ret;
+	unsigned int ino;
+	off_t index;
+	struct ext2_dir_entry_2 entry;
+
+	ino = EXT2_ROOT_INO;
+	while(1) {
+		while (*name == '\\')
+			name++;
+		if (!*name)
+		    break;
+		ret = ext2_get_inode(volume, ino, &inode);
+		if (ret == -1)
+			return 0;
+		index = 0;
+		while (1) {
+			index = ext2_dir_entry(volume, &inode, index, &entry);
+			if (index == -1)
+				return 0;
+			ret = strncmp(name, entry.name, entry.name_len);
+			if (ret == 0  &&
+			    (name[entry.name_len] == 0 ||
+			     name[entry.name_len] == '\\')) {
+			     	ino = entry.inode;
+				break;
+			}
+		}
+		name += entry.name_len;
+	}
+
+	return ino;
+}