diff options
Diffstat (limited to 'sys/geom/label/g_label_reiserfs.c')
| -rw-r--r-- | sys/geom/label/g_label_reiserfs.c | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/sys/geom/label/g_label_reiserfs.c b/sys/geom/label/g_label_reiserfs.c new file mode 100644 index 000000000000..8ef1ec89d699 --- /dev/null +++ b/sys/geom/label/g_label_reiserfs.c @@ -0,0 +1,113 @@ +/*- + * Copyright (c) 2005 Stanislav Sedov + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/kernel.h> +#include <sys/malloc.h> + +#include <geom/geom.h> +#include <geom/label/g_label.h> + +#define REISERFS_NEW_DISK_OFFSET 64 * 1024 +#define REISERFS_OLD_DISK_OFFSET 8 * 1024 +#define REISERFS_SUPER_MAGIC "ReIsEr" + +typedef struct resiserfs_sb { + uint8_t fake1[52]; + char s_magic[10]; + uint8_t fake2[10]; + uint16_t s_version; + uint8_t fake3[26]; + char s_volume_name[16]; +} reiserfs_sb_t; + +static reiserfs_sb_t * +g_label_reiserfs_read_super(struct g_consumer *cp, off_t offset, off_t len) +{ + reiserfs_sb_t *fs; + + fs = (reiserfs_sb_t *)g_read_data(cp, offset, len, NULL); + if (fs == NULL) + return (NULL); + + if (strncmp(fs->s_magic, REISERFS_SUPER_MAGIC, + strlen(REISERFS_SUPER_MAGIC)) != 0) { + g_free(fs); + return (NULL); + } + + return (fs); +} + +static void +g_label_reiserfs_taste(struct g_consumer *cp, char *label, size_t size) +{ + struct g_provider *pp; + reiserfs_sb_t *fs; + + g_topology_assert_not(); + pp = cp->provider; + label[0] = '\0'; + + /* Try old format */ + fs = g_label_reiserfs_read_super(cp, REISERFS_OLD_DISK_OFFSET, + pp->sectorsize); + if (fs == NULL) { + /* Try new format */ + fs = g_label_reiserfs_read_super(cp, REISERFS_NEW_DISK_OFFSET, + pp->sectorsize); + } + if (fs == NULL) + return; + + /* Check version */ + if (fs->s_version == 2) { + G_LABEL_DEBUG(1, "reiserfs file system detected on %s.", + pp->name); + } else { + goto exit_free; + } + + /* Check for volume label */ + if (fs->s_volume_name[0] == '\0') + goto exit_free; + + /* Terminate label */ + fs->s_volume_name[sizeof(fs->s_volume_name) - 1] = '\0'; + strlcpy(label, fs->s_volume_name, size); + +exit_free: + g_free(fs); +} + +const struct g_label_desc g_label_reiserfs = { + .ld_taste = g_label_reiserfs_taste, + .ld_dir = "reiserfs" +}; |