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Differential D30825 Diff 91805 sys/geom/label/g_label_ufs.c

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sys/geom/label/g_label_ufs.c

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#include <geom/geom.h> #include <geom/geom.h>
#include <geom/geom_dbg.h> #include <geom/geom_dbg.h>
#include <geom/label/g_label.h> #include <geom/label/g_label.h>
#define G_LABEL_UFS_VOLUME 0 #define G_LABEL_UFS_VOLUME 0
#define G_LABEL_UFS_ID 1 #define G_LABEL_UFS_ID 1
/* /*
* G_LABEL_UFS_CMP returns true if difference between provider mediasize * Try to find a superblock on the provider. If successful, look for a volume
* and filesystem size is less than G_LABEL_UFS_MAXDIFF sectors * label and create an appropriate provider based on that.
*/ */
#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
/*
* Try to find a superblock on the provider. If successful, then
* check that the size in the superblock corresponds to the size
* of the underlying provider. Finally, look for a volume label
* and create an appropriate provider based on that.
*/
static void static void
g_label_ufs_taste_common(struct g_consumer *cp, char *label, size_t size, int what) g_label_ufs_taste_common(struct g_consumer *cp, char *label, size_t size, int what)
{ {
struct g_provider *pp; struct g_provider *pp;
struct fs *fs; struct fs *fs;
g_topology_assert_not(); g_topology_assert_not();
pp = cp->provider; pp = cp->provider;
label[0] = '\0'; label[0] = '\0';
fs = NULL; fs = NULL;
if (SBLOCKSIZE % pp->sectorsize != 0 || ffs_sbget(cp, &fs, if (SBLOCKSIZE % pp->sectorsize != 0 || ffs_sbget(cp, &fs,
STDSB_NOHASHFAIL, M_GEOM, g_use_g_read_data) != 0) { STDSB_NOHASHFAIL, M_GEOM, g_use_g_read_data) != 0) {
KASSERT(fs == NULL, KASSERT(fs == NULL,
("g_label_ufs_taste_common: non-NULL fs %p\n", fs)); ("g_label_ufs_taste_common: non-NULL fs %p\n", fs));
return; return;
} }
/* /* Check for magic. */
* Check for magic. We also need to check if file system size if (fs->fs_magic == FS_UFS1_MAGIC && fs->fs_fsize > 0) {
* is almost equal to providers size, because sysinstall(8)
* used to bogusly put first partition at offset 0
* instead of 16, and glabel/ufs would find file system on slice
* instead of 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).
*/
if (fs->fs_magic == FS_UFS1_MAGIC && fs->fs_fsize > 0 &&
( G_LABEL_UFS_CMP(pp, fs, fs_old_size)
|| G_LABEL_UFS_CMP(pp, fs, fs_providersize))) {
/* Valid UFS1. */ /* Valid UFS1. */
} else if (fs->fs_magic == FS_UFS2_MAGIC && fs->fs_fsize > 0 && } else if (fs->fs_magic == FS_UFS2_MAGIC && fs->fs_fsize > 0) {
( G_LABEL_UFS_CMP(pp, fs, fs_size)
|| G_LABEL_UFS_CMP(pp, fs, fs_providersize))) {
/* Valid UFS2. */ /* Valid UFS2. */
} else { } else {
goto out; goto out;
} }
G_LABEL_DEBUG(1, "%s file system detected on %s.", G_LABEL_DEBUG(1, "%s file system detected on %s.",
fs->fs_magic == FS_UFS1_MAGIC ? "UFS1" : "UFS2", pp->name); fs->fs_magic == FS_UFS1_MAGIC ? "UFS1" : "UFS2", pp->name);
switch (what) { switch (what) {
case G_LABEL_UFS_VOLUME: case G_LABEL_UFS_VOLUME:
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