X-Git-Url: http://git.annexia.org/?p=libguestfs.git;a=blobdiff_plain;f=daemon%2Flvm.c;h=216c9c44ab5d6bc7938947cf5e85dad9e1c7b6fc;hp=742b40ba7606cc86b018ea926d8be656e34d5eae;hb=428a45c3e15f03e9861e1b551e1ae8da821dba5f;hpb=adf20c0c4d9f488d55254f54a79079b9cacbde8d diff --git a/daemon/lvm.c b/daemon/lvm.c index 742b40b..216c9c4 100644 --- a/daemon/lvm.c +++ b/daemon/lvm.c @@ -20,12 +20,21 @@ #include #include +#include #include #include -#include +#include #include "daemon.h" +#include "c-ctype.h" #include "actions.h" +#include "optgroups.h" + +int +optgroup_lvm2_available (void) +{ + return prog_exists ("lvm"); +} /* LVM actions. Keep an eye on liblvm, although at the time * of writing it hasn't progressed very far. @@ -49,12 +58,12 @@ convert_lvm_output (char *out, const char *prefix) pend++; } - while (*p && isspace (*p)) /* Skip any leading whitespace. */ + while (*p && c_isspace (*p)) /* Skip any leading whitespace. */ p++; /* Sigh, skip trailing whitespace too. "pvs", I'm looking at you. */ len = strlen (p)-1; - while (*p && isspace (p[len])) + while (*p && c_isspace (p[len])) p[len--] = '\0'; if (!*p) { /* Empty line? Skip it. */ @@ -93,7 +102,7 @@ do_pvs (void) int r; r = command (&out, &err, - "/sbin/lvm", "pvs", "-o", "pv_name", "--noheadings", NULL); + "lvm", "pvs", "-o", "pv_name", "--noheadings", NULL); if (r == -1) { reply_with_error ("%s", err); free (out); @@ -113,7 +122,7 @@ do_vgs (void) int r; r = command (&out, &err, - "/sbin/lvm", "vgs", "-o", "vg_name", "--noheadings", NULL); + "lvm", "vgs", "-o", "vg_name", "--noheadings", NULL); if (r == -1) { reply_with_error ("%s", err); free (out); @@ -133,7 +142,7 @@ do_lvs (void) int r; r = command (&out, &err, - "/sbin/lvm", "lvs", + "lvm", "lvs", "-o", "vg_name,lv_name", "--noheadings", "--separator", "/", NULL); if (r == -1) { @@ -177,7 +186,7 @@ do_pvcreate (const char *device) int r; r = command (NULL, &err, - "/sbin/lvm", "pvcreate", device, NULL); + "lvm", "pvcreate", device, NULL); if (r == -1) { reply_with_error ("%s", err); free (err); @@ -204,13 +213,13 @@ do_vgcreate (const char *volgroup, char *const *physvols) reply_with_perror ("malloc"); return -1; } - argv[0] = "/sbin/lvm"; + argv[0] = "lvm"; argv[1] = "vgcreate"; argv[2] = volgroup; for (i = 3; i <= argc; ++i) argv[i] = physvols[i-3]; - r = commandv (NULL, &err, (char **) argv); + r = commandv (NULL, &err, (const char * const*) argv); if (r == -1) { reply_with_error ("%s", err); free (err); @@ -234,7 +243,7 @@ do_lvcreate (const char *logvol, const char *volgroup, int mbytes) snprintf (size, sizeof size, "%d", mbytes); r = command (NULL, &err, - "/sbin/lvm", "lvcreate", + "lvm", "lvcreate", "-L", size, "-n", logvol, volgroup, NULL); if (r == -1) { reply_with_error ("%s", err); @@ -259,10 +268,36 @@ do_lvresize (const char *logvol, int mbytes) snprintf (size, sizeof size, "%d", mbytes); r = command (NULL, &err, - "/sbin/lvm", "lvresize", - "-L", size, logvol, NULL); + "lvm", "lvresize", + "--force", "-L", size, logvol, NULL); + if (r == -1) { + reply_with_error ("%s", err); + free (err); + return -1; + } + + free (err); + return 0; +} + +int +do_lvresize_free (const char *logvol, int percent) +{ + char *err; + int r; + + if (percent < 0 || percent > 100) { + reply_with_error ("percentage must be [0..100] (was %d)", percent); + return -1; + } + + char size[64]; + snprintf (size, sizeof size, "+%d%%FREE", percent); + + r = command (NULL, &err, + "lvm", "lvresize", "-l", size, logvol, NULL); if (r == -1) { - reply_with_error ("lvresize: %s", err); + reply_with_error ("%s", err); free (err); return -1; } @@ -287,7 +322,7 @@ do_lvm_remove_all (void) return -1; for (i = 0; xs[i] != NULL; ++i) { - r = command (NULL, &err, "/sbin/lvm", "lvremove", "-f", xs[i], NULL); + r = command (NULL, &err, "lvm", "lvremove", "-f", xs[i], NULL); if (r == -1) { reply_with_error ("lvremove: %s: %s", xs[i], err); free (err); @@ -304,7 +339,7 @@ do_lvm_remove_all (void) return -1; for (i = 0; xs[i] != NULL; ++i) { - r = command (NULL, &err, "/sbin/lvm", "vgremove", "-f", xs[i], NULL); + r = command (NULL, &err, "lvm", "vgremove", "-f", xs[i], NULL); if (r == -1) { reply_with_error ("vgremove: %s: %s", xs[i], err); free (err); @@ -321,7 +356,7 @@ do_lvm_remove_all (void) return -1; for (i = 0; xs[i] != NULL; ++i) { - r = command (NULL, &err, "/sbin/lvm", "pvremove", "-f", xs[i], NULL); + r = command (NULL, &err, "lvm", "pvremove", "-f", xs[i], NULL); if (r == -1) { reply_with_error ("pvremove: %s: %s", xs[i], err); free (err); @@ -345,7 +380,7 @@ do_lvremove (const char *device) int r; r = command (NULL, &err, - "/sbin/lvm", "lvremove", "-f", device, NULL); + "lvm", "lvremove", "-f", device, NULL); if (r == -1) { reply_with_error ("%s", err); free (err); @@ -366,7 +401,7 @@ do_vgremove (const char *device) int r; r = command (NULL, &err, - "/sbin/lvm", "vgremove", "-f", device, NULL); + "lvm", "vgremove", "-f", device, NULL); if (r == -1) { reply_with_error ("%s", err); free (err); @@ -387,7 +422,7 @@ do_pvremove (const char *device) int r; r = command (NULL, &err, - "/sbin/lvm", "pvremove", "-ff", device, NULL); + "lvm", "pvremove", "-ff", device, NULL); if (r == -1) { reply_with_error ("%s", err); free (err); @@ -408,9 +443,32 @@ do_pvresize (const char *device) int r; r = command (NULL, &err, - "/sbin/lvm", "pvresize", device, NULL); + "lvm", "pvresize", device, NULL); + if (r == -1) { + reply_with_error ("%s: %s", device, err); + free (err); + return -1; + } + + free (err); + return 0; +} + +int +do_pvresize_size (const char *device, int64_t size) +{ + char *err; + int r; + + char buf[32]; + snprintf (buf, sizeof buf, "%" PRIi64 "b", size); + + r = command (NULL, &err, + "lvm", "pvresize", + "--setphysicalvolumesize", buf, + device, NULL); if (r == -1) { - reply_with_error ("pvresize: %s: %s", device, err); + reply_with_error ("%s: %s", device, err); free (err); return -1; } @@ -433,14 +491,14 @@ do_vg_activate (int activate, char *const *volgroups) return -1; } - argv[0] = "/sbin/lvm"; + argv[0] = "lvm"; argv[1] = "vgchange"; argv[2] = "-a"; argv[3] = activate ? "y" : "n"; for (i = 4; i <= argc; ++i) argv[i] = volgroups[i-4]; - r = commandv (NULL, &err, (char **) argv); + r = commandv (NULL, &err, (const char * const*) argv); if (r == -1) { reply_with_error ("vgchange: %s", err); free (err); @@ -460,3 +518,234 @@ do_vg_activate_all (int activate) char *empty[] = { NULL }; return do_vg_activate (activate, empty); } + +int +do_lvrename (const char *logvol, const char *newlogvol) +{ + char *err; + int r; + + r = command (NULL, &err, + "lvm", "lvrename", + logvol, newlogvol, NULL); + if (r == -1) { + reply_with_error ("%s -> %s: %s", logvol, newlogvol, err); + free (err); + return -1; + } + + free (err); + + udev_settle (); + + return 0; +} + +int +do_vgrename (const char *volgroup, const char *newvolgroup) +{ + char *err; + int r; + + r = command (NULL, &err, + "lvm", "vgrename", + volgroup, newvolgroup, NULL); + if (r == -1) { + reply_with_error ("%s -> %s: %s", volgroup, newvolgroup, err); + free (err); + return -1; + } + + free (err); + + udev_settle (); + + return 0; +} + +static char * +get_lvm_field (const char *cmd, const char *field, const char *device) +{ + char *out; + char *err; + int r = command (&out, &err, + "lvm", cmd, + "--unbuffered", "--noheadings", "-o", field, + device, NULL); + if (r == -1) { + reply_with_error ("%s: %s", device, err); + free (out); + free (err); + return NULL; + } + + free (err); + + trim (out); + return out; /* Caller frees. */ +} + +char * +do_pvuuid (const char *device) +{ + return get_lvm_field ("pvs", "pv_uuid", device); +} + +char * +do_vguuid (const char *vgname) +{ + return get_lvm_field ("vgs", "vg_uuid", vgname); +} + +char * +do_lvuuid (const char *device) +{ + return get_lvm_field ("lvs", "lv_uuid", device); +} + +static char ** +get_lvm_fields (const char *cmd, const char *field, const char *device) +{ + char *out; + char *err; + int r = command (&out, &err, + "lvm", cmd, + "--unbuffered", "--noheadings", "-o", field, + device, NULL); + if (r == -1) { + reply_with_error ("%s: %s", device, err); + free (out); + free (err); + return NULL; + } + + free (err); + + char **ret = split_lines (out); + free (out); + + if (ret == NULL) + return NULL; + + size_t i; + for (i = 0; ret[i] != NULL; ++i) + trim (ret[i]); + + return ret; +} + +char ** +do_vgpvuuids (const char *vgname) +{ + return get_lvm_fields ("vgs", "pv_uuid", vgname); +} + +char ** +do_vglvuuids (const char *vgname) +{ + return get_lvm_fields ("vgs", "lv_uuid", vgname); +} + +int +do_vgscan (void) +{ + char *err; + int r; + + r = command (NULL, &err, + "lvm", "vgscan", NULL); + if (r == -1) { + reply_with_error ("%s", err); + free (err); + return -1; + } + + free (err); + return 0; +} + +/* Convert a non-canonical LV path like /dev/mapper/vg-lv or /dev/dm-0 + * to a canonical one. + * + * This is harder than it should be. A LV device like /dev/VG/LV is + * really a symlink to a device-mapper device like /dev/dm-0. However + * at the device-mapper (kernel) level, nothing is really known about + * LVM (a userspace concept). Therefore we use a convoluted method to + * determine this, by listing out known LVs and checking whether the + * rdev (major/minor) of the device we are passed matches any of them. + * + * Note use of 'stat' instead of 'lstat' so that symlinks are fully + * resolved. + * + * Returns: + * 1 = conversion was successful, path is an LV + * '*ret' is set to the updated path if 'ret' is non-NULL. + * 0 = path is not an LV + * -1 = error, reply_with_* has been called + * + */ +int +lv_canonical (const char *device, char **ret) +{ + struct stat stat1, stat2; + + int r = stat (device, &stat1); + if (r == -1) { + reply_with_perror ("stat: %s", device); + return -1; + } + + char **lvs = do_lvs (); + if (lvs == NULL) + return -1; + + size_t i; + for (i = 0; lvs[i] != NULL; ++i) { + r = stat (lvs[i], &stat2); + if (r == -1) { + reply_with_perror ("stat: %s", lvs[i]); + free_strings (lvs); + return -1; + } + if (stat1.st_rdev == stat2.st_rdev) { /* found it */ + if (ret) { + *ret = strdup (lvs[i]); + if (*ret == NULL) { + reply_with_perror ("strdup"); + free_strings (lvs); + return -1; + } + } + free_strings (lvs); + return 1; + } + } + + /* not found */ + free_strings (lvs); + return 0; +} + +/* Test if a device is a logical volume (RHBZ#619793). */ +int +do_is_lv (const char *device) +{ + return lv_canonical (device, NULL); +} + +/* Return canonical name of LV to caller (RHBZ#638899). */ +char * +do_lvm_canonical_lv_name (const char *device) +{ + char *canonical; + int r = lv_canonical (device, &canonical); + if (r == -1) + return NULL; + + if (r == 0) { + reply_with_error ("%s: not a logical volume", device); + return NULL; + } + + return canonical; /* caller frees */ +}