mirror of https://github.com/vitalif/e2fsprogs
Add support for XFS filesystems.
parent
342d847db3
commit
21d14ec7aa
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@ -48,6 +48,15 @@ struct ext2_super_block {
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};
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#define ext2magic(s) ((unsigned int) s.s_magic[0] + (((unsigned int) s.s_magic[1]) << 8))
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#define XFS_SUPER_MAGIC "XFSB"
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struct xfs_super_block {
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unsigned char s_magic[4];
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unsigned char s_dummy[28];
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unsigned char s_uuid[16];
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unsigned char s_dummy2[60];
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unsigned char s_fname[12];
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};
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static struct uuidCache_s {
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struct uuidCache_s *next;
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char uuid[16];
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@ -55,34 +64,46 @@ static struct uuidCache_s {
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char *device;
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} *uuidCache = NULL;
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/* for now, only ext2 is supported */
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/* for now, only ext2 and xfs are supported */
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static int
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get_label_uuid(const char *device, char **label, char *uuid) {
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/* start with a test for ext2, taken from mount_guess_fstype */
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/* start with ext2 and xfs tests, taken from mount_guess_fstype */
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/* should merge these later */
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int fd;
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size_t label_size;
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char *sb_uuid = 0, *sb_label = 0;
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struct ext2_super_block e2sb;
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struct xfs_super_block xfsb;
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fd = open(device, O_RDONLY);
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if (fd < 0)
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return 1;
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if (lseek(fd, 1024, SEEK_SET) != 1024
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|| read(fd, (char *) &e2sb, sizeof(e2sb)) != sizeof(e2sb)
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|| (ext2magic(e2sb) != EXT2_SUPER_MAGIC)) {
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if (lseek(fd, 1024, SEEK_SET) == 1024
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&& read(fd, (char *) &e2sb, sizeof(e2sb)) == sizeof(e2sb)
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&& (ext2magic(e2sb) == EXT2_SUPER_MAGIC)) {
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sb_uuid = e2sb.s_uuid;
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sb_label = e2sb.s_volume_name;
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label_size = sizeof(e2sb.s_volume_name);
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} else if (lseek(fd, 0, SEEK_SET) == 0
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&& read(fd, (char *) &xfsb, sizeof(xfsb)) == sizeof(xfsb)
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&& strncmp((char *) &xfsb.s_magic, XFS_SUPER_MAGIC, 4) == 0) {
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sb_uuid = xfsb.s_uuid;
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sb_label = xfsb.s_fname;
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label_size = sizeof(xfsb.s_fname);
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} else {
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close(fd);
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return 1;
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}
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close(fd);
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/* superblock is ext2 - now what is its label? */
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memcpy(uuid, e2sb.s_uuid, sizeof(e2sb.s_uuid));
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*label = calloc(sizeof(e2sb.s_volume_name) + 1, 1);
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memcpy(*label, e2sb.s_volume_name, sizeof(e2sb.s_volume_name));
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if (sb_uuid)
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memcpy(uuid, sb_uuid, sizeof(e2sb.s_uuid));
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if (sb_label) {
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if ((*label = calloc(label_size + 1, 1)) != NULL)
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memcpy(*label, sb_label, label_size);
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}
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return 0;
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}
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