diff options
Diffstat (limited to 'sys/geom/label/g_label_ufs.c')
| -rw-r--r-- | sys/geom/label/g_label_ufs.c | 206 |
1 files changed, 206 insertions, 0 deletions
diff --git a/sys/geom/label/g_label_ufs.c b/sys/geom/label/g_label_ufs.c new file mode 100644 index 000000000000..9361af7a136b --- /dev/null +++ b/sys/geom/label/g_label_ufs.c @@ -0,0 +1,206 @@ +/*- + * SPDX-License-Identifier: BSD-2-Clause + * + * Copyright (c) 2002, 2003 Gordon Tetlow + * Copyright (c) 2006 Pawel Jakub Dawidek <pjd@FreeBSD.org> + * 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 AUTHORS 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 AUTHORS 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/param.h> +#include <sys/systm.h> +#include <sys/disklabel.h> +#include <sys/malloc.h> +#include <sys/vnode.h> + +#include <ufs/ufs/dinode.h> +#include <ufs/ffs/fs.h> +#include <ufs/ufs/quota.h> +#include <ufs/ufs/extattr.h> +#include <ufs/ffs/ffs_extern.h> + +#include <geom/geom.h> +#include <geom/geom_dbg.h> +#include <geom/label/g_label.h> + +#define G_LABEL_UFS_VOLUME 0 +#define G_LABEL_UFS_ID 1 + +/* + * G_LABEL_UFS_CMP returns true if difference between provider mediasize + * and filesystem size is less than G_LABEL_UFS_MAXDIFF sectors + */ +#define G_LABEL_UFS_CMP(prov, fsys, size) \ + ( abs( ((fsys)->size) - ( (prov)->mediasize / (fsys)->fs_fsize )) \ + < G_LABEL_UFS_MAXDIFF ) +#define G_LABEL_UFS_MAXDIFF 0x100 + +/* + * For providers that look like disklabels we need to check if the file system + * size is almost equal to the provider's size, because sysinstall(8) used to + * bogusly put the first partition at offset 0 instead of 16, and glabel/ufs + * would find a file system on the slice instead of the partition. + * + * In addition, media size can be a bit bigger than file system size. For + * instance, mkuzip can append bytes to align data to large sector size (it + * improves compression rates). + */ +static bool +g_label_ufs_ignore_bsdlabel_slice(struct g_consumer *cp, + struct fs *fs) +{ + struct g_provider *pp; + u_char *buf; + uint32_t magic1, magic2; + int error; + + pp = cp->provider; + + /* + * If the expected provider size for the filesystem matches the + * real provider size then don't ignore this filesystem. + */ + if (G_LABEL_UFS_CMP(pp, fs, fs_providersize)) + return (false); + + /* + * If the filesystem size matches the real provider size then + * don't ignore this filesystem. + */ + if (fs->fs_magic == FS_UFS1_MAGIC ? + G_LABEL_UFS_CMP(pp, fs, fs_old_size) : + G_LABEL_UFS_CMP(pp, fs, fs_size)) + return (false); + + /* + * Provider is bigger than expected; probe to see if there's a + * disklabel. Adapted from g_part_bsd_probe. + */ + + /* Check if the superblock overlaps where the disklabel lives. */ + if (fs->fs_sblockloc < pp->sectorsize * 2) + return (false); + + /* Sanity-check the provider. */ + if (pp->sectorsize < sizeof(struct disklabel) || + pp->mediasize < BBSIZE) + return (false); + if (BBSIZE % pp->sectorsize) + return (false); + + /* Check that there's a disklabel. */ + buf = g_read_data(cp, pp->sectorsize, pp->sectorsize, &error); + if (buf == NULL) + return (false); + magic1 = le32dec(buf + 0); + magic2 = le32dec(buf + 132); + g_free(buf); + if (magic1 == DISKMAGIC && magic2 == DISKMAGIC) + return (true); + + return (false); +} + +/* + * Try to find a superblock on the provider. If successful, look for a volume + * label and create an appropriate provider based on that. + */ +static void +g_label_ufs_taste_common(struct g_consumer *cp, char *label, size_t size, int what) +{ + struct g_provider *pp; + struct fs *fs; + + g_topology_assert_not(); + pp = cp->provider; + label[0] = '\0'; + + fs = NULL; + KASSERT(pp->sectorsize != 0, ("Tasting a disk with 0 sectorsize")); + if (SBLOCKSIZE % pp->sectorsize != 0 || ffs_sbget(cp, &fs, UFS_STDSB, + UFS_NOHASHFAIL | UFS_NOCSUM | UFS_NOMSG, M_GEOM, g_use_g_read_data) + != 0) { + KASSERT(fs == NULL, + ("g_label_ufs_taste_common: non-NULL fs %p\n", fs)); + return; + } + + /* Check for magic. */ + if (fs->fs_magic == FS_UFS1_MAGIC && fs->fs_fsize > 0) { + /* Valid UFS1. */ + } else if (fs->fs_magic == FS_UFS2_MAGIC && fs->fs_fsize > 0) { + /* Valid UFS2. */ + } else { + goto out; + } + /* Check if this should be ignored for compatibility. */ + if (g_label_ufs_ignore_bsdlabel_slice(cp, fs)) + goto out; + G_LABEL_DEBUG(1, "%s file system detected on %s.", + fs->fs_magic == FS_UFS1_MAGIC ? "UFS1" : "UFS2", pp->name); + switch (what) { + case G_LABEL_UFS_VOLUME: + /* Check for volume label */ + if (fs->fs_volname[0] != '\0') + strlcpy(label, fs->fs_volname, size); + break; + case G_LABEL_UFS_ID: + if (fs->fs_id[0] != 0 || fs->fs_id[1] != 0) + snprintf(label, size, "%08x%08x", fs->fs_id[0], + fs->fs_id[1]); + break; + } +out: + g_free(fs); +} + +static void +g_label_ufs_volume_taste(struct g_consumer *cp, char *label, size_t size) +{ + + g_label_ufs_taste_common(cp, label, size, G_LABEL_UFS_VOLUME); +} + +static void +g_label_ufs_id_taste(struct g_consumer *cp, char *label, size_t size) +{ + + g_label_ufs_taste_common(cp, label, size, G_LABEL_UFS_ID); +} + +struct g_label_desc g_label_ufs_volume = { + .ld_taste = g_label_ufs_volume_taste, + .ld_dirprefix = "ufs/", + .ld_enabled = 1 +}; + +struct g_label_desc g_label_ufs_id = { + .ld_taste = g_label_ufs_id_taste, + .ld_dirprefix = "ufsid/", + .ld_enabled = 1 +}; + +G_LABEL_INIT(ufsid, g_label_ufs_id, "Create device nodes for UFS file system IDs"); +G_LABEL_INIT(ufs, g_label_ufs_volume, "Create device nodes for UFS volume names"); + +MODULE_DEPEND(g_label, ufs, 1, 1, 1); |