X-Git-Url: http://git.annexia.org/?p=libguestfs.git;a=blobdiff_plain;f=daemon%2Flvm.c;h=216c9c44ab5d6bc7938947cf5e85dad9e1c7b6fc;hp=143c5a810447fe5e468ee655b6a1f5c76137ef30;hb=e44cf42f362d793c47d892a18a6853d88abd6ecb;hpb=56bef498f46ac3dd580f4bde3c8f3ed2fe688826 diff --git a/daemon/lvm.c b/daemon/lvm.c index 143c5a8..216c9c4 100644 --- a/daemon/lvm.c +++ b/daemon/lvm.c @@ -1,5 +1,5 @@ /* libguestfs - the guestfsd daemon - * Copyright (C) 2009 Red Hat Inc. + * Copyright (C) 2009 Red Hat Inc. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by @@ -20,19 +20,28 @@ #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. */ static char ** -convert_lvm_output (char *out, char *prefix) +convert_lvm_output (char *out, const char *prefix) { char *p, *pend; char **r = NULL; @@ -49,12 +58,12 @@ convert_lvm_output (char *out, 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); @@ -133,9 +142,9 @@ do_lvs (void) int r; r = command (&out, &err, - "/sbin/lvm", "lvs", - "-o", "vg_name,lv_name", "--noheadings", - "--separator", "/", NULL); + "lvm", "lvs", + "-o", "vg_name,lv_name", "--noheadings", + "--separator", "/", NULL); if (r == -1) { reply_with_error ("%s", err); free (out); @@ -152,34 +161,32 @@ do_lvs (void) * the code. That code is in stubs.c, and it is generated as usual * by generator.ml. */ -guestfs_lvm_int_pv_list * +guestfs_int_lvm_pv_list * do_pvs_full (void) { return parse_command_line_pvs (); } -guestfs_lvm_int_vg_list * +guestfs_int_lvm_vg_list * do_vgs_full (void) { return parse_command_line_vgs (); } -guestfs_lvm_int_lv_list * +guestfs_int_lvm_lv_list * do_lvs_full (void) { return parse_command_line_lvs (); } int -do_pvcreate (char *device) +do_pvcreate (const char *device) { char *err; int r; - IS_DEVICE (device, -1); - r = command (NULL, &err, - "/sbin/lvm", "pvcreate", device, NULL); + "lvm", "pvcreate", device, NULL); if (r == -1) { reply_with_error ("%s", err); free (err); @@ -187,33 +194,32 @@ do_pvcreate (char *device) } free (err); + + udev_settle (); + return 0; } int -do_vgcreate (char *volgroup, char **physvols) +do_vgcreate (const char *volgroup, char *const *physvols) { char *err; int r, argc, i; const char **argv; - /* Check they are devices and also do device name translation. */ - for (i = 0; physvols[i] != NULL; ++i) - IS_DEVICE (physvols[i], -1); - argc = count_strings (physvols) + 3; argv = malloc (sizeof (char *) * (argc + 1)); if (argv == NULL) { 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, argv); + r = commandv (NULL, &err, (const char * const*) argv); if (r == -1) { reply_with_error ("%s", err); free (err); @@ -221,11 +227,14 @@ do_vgcreate (char *volgroup, char **physvols) } free (err); + + udev_settle (); + return 0; } int -do_lvcreate (char *logvol, char *volgroup, int mbytes) +do_lvcreate (const char *logvol, const char *volgroup, int mbytes) { char *err; int r; @@ -234,8 +243,8 @@ do_lvcreate (char *logvol, char *volgroup, int mbytes) snprintf (size, sizeof size, "%d", mbytes); r = command (NULL, &err, - "/sbin/lvm", "lvcreate", - "-L", size, "-n", logvol, volgroup, NULL); + "lvm", "lvcreate", + "-L", size, "-n", logvol, volgroup, NULL); if (r == -1) { reply_with_error ("%s", err); free (err); @@ -243,25 +252,52 @@ do_lvcreate (char *logvol, char *volgroup, int mbytes) } free (err); + + udev_settle (); + return 0; } int -do_lvresize (char *logvol, int mbytes) +do_lvresize (const char *logvol, int mbytes) { char *err; int r; char size[64]; - IS_DEVICE (logvol, -1); - 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 ("lvresize: %s", err); + 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 ("%s", err); free (err); return -1; } @@ -286,7 +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); @@ -303,7 +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); @@ -320,7 +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); @@ -331,20 +367,20 @@ do_lvm_remove_all (void) } free_strings (xs); + udev_settle (); + /* There, that was easy, sorry about your data. */ return 0; } int -do_lvremove (char *device) +do_lvremove (const char *device) { char *err; int r; - IS_DEVICE (device, -1); - 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); @@ -352,17 +388,20 @@ do_lvremove (char *device) } free (err); + + udev_settle (); + return 0; } int -do_vgremove (char *device) +do_vgremove (const char *device) { char *err; 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); @@ -370,19 +409,20 @@ do_vgremove (char *device) } free (err); + + udev_settle (); + return 0; } int -do_pvremove (char *device) +do_pvremove (const char *device) { char *err; int r; - IS_DEVICE (device, -1); - 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); @@ -390,21 +430,45 @@ do_pvremove (char *device) } free (err); + + udev_settle (); + return 0; } int -do_pvresize (char *device) +do_pvresize (const char *device) { char *err; int r; - IS_DEVICE (device, -1); + r = command (NULL, &err, + "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, - "/sbin/lvm", "pvresize", device, NULL); + "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; } @@ -414,7 +478,7 @@ do_pvresize (char *device) } int -do_vg_activate (int activate, char **volgroups) +do_vg_activate (int activate, char *const *volgroups) { char *err; int r, i, argc; @@ -427,14 +491,14 @@ do_vg_activate (int activate, char **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, argv); + r = commandv (NULL, &err, (const char * const*) argv); if (r == -1) { reply_with_error ("vgchange: %s", err); free (err); @@ -442,6 +506,9 @@ do_vg_activate (int activate, char **volgroups) } free (err); + + udev_settle (); + return 0; } @@ -451,3 +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 */ +}