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git://sourceware.org/git/lvm2.git
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1653 lines
30 KiB
C
1653 lines
30 KiB
C
/*
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* Copyright (C) 2002 Sistina Software (UK) Limited.
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*
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* This file is released under the LGPL.
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*/
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#include "lib.h"
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#include "dev_manager.h"
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#include "pool.h"
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#include "hash.h"
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#include "lvm-string.h"
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#include "fs.h"
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#include <libdevmapper.h>
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#include <limits.h>
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#include <dirent.h>
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/*
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* Algorithm
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* ---------
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*
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* 1) Examine dm directory, and store details of active mapped devices
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* in the VG. Indexed by lvid-layer. (_scan_existing_devices)
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*
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* 2) Build lists of visible devices that need to be left in each state:
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* active, reloaded, suspended.
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*
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* 3) Run through these lists and set the appropriate marks on each device
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* and its dependencies.
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*
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* 4) Add layers not marked active to remove_list for removal at the end.
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*
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* 5) Remove unmarked layers from core.
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*
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* 6) Activate remaining layers, recursing to handle dependedncies and
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* skipping any that already exist unless they are marked as needing
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* reloading.
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*
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* 7) Remove layers in the remove_list. (_remove_old_layers)
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*
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*/
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enum {
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ACTIVE = 0,
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RELOAD = 1,
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VISIBLE = 2,
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READWRITE = 3,
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SUSPENDED = 4
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};
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typedef enum {
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ACTIVATE,
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DEACTIVATE,
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SUSPEND,
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RESUME
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} action_t;
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struct dev_layer {
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char *name;
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int flags;
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/*
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* Setup the dm_task.
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*/
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int (*populate) (struct dev_manager * dm,
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struct dm_task * dmt, struct dev_layer * dl);
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struct dm_info info;
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/* lvid plus layer */
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const char *dlid;
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struct logical_volume *lv;
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/*
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* Devices that must be created before this one can be
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* created. Holds str_lists.
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*/
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struct list pre_create;
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};
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struct dl_list {
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struct list list;
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struct dev_layer *dl;
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};
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struct dev_manager {
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struct pool *mem;
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char *vg_name;
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/*
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* list of struct lv_list, contains lvs that we wish to
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* be active after execution.
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*/
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struct list active_list;
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/*
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* Layers that need reloading.
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*/
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struct list reload_list;
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/*
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* Layers that need suspending.
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*/
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struct list suspend_list;
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/*
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* Layers that will need removing after activation.
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*/
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struct list remove_list;
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struct hash_table *layers;
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};
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/*
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* Functions to manage the flags.
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*/
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static inline int _get_flag(struct dev_layer *dl, int bit)
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{
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return (dl->flags & (1 << bit)) ? 1 : 0;
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}
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static inline void _set_flag(struct dev_layer *dl, int bit)
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{
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dl->flags |= (1 << bit);
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}
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static inline void _clear_flag(struct dev_layer *dl, int bit)
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{
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dl->flags &= ~(1 << bit);
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}
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static int _pre_list_add(struct pool *mem, struct list *pl, char *str)
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{
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struct str_list *sl;
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struct list *plh;
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if (!str) {
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stack;
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return 0;
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}
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list_iterate(plh, pl) {
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}
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if (!(sl = pool_alloc(mem, sizeof(*sl)))) {
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stack;
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return 0;
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}
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sl->str = str;
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list_add(pl, &sl->list);
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return 1;
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}
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/*
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* Device layer names are all of the form <vg>-<lv>-<layer>, any
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* other hyphens that appear in these names are quoted with yet
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* another hyphen. The top layer of any device has no layer
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* name. eg, vg0-lvol0.
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*/
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static void _count_hyphens(const char *str, size_t *len, int *hyphens)
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{
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const char *ptr;
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for (ptr = str; *ptr; ptr++, (*len)++)
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if (*ptr == '-')
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(*hyphens)++;
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}
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/*
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* Copies a string, quoting hyphens with hyphens.
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*/
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static void _quote_hyphens(char **out, const char *src)
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{
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while (*src) {
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if (*src == '-')
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*(*out)++ = '-';
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*(*out)++ = *src++;
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}
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}
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/*
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* <vg>-<lv>-<layer> or if !layer just <vg>-<lv>.
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*/
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static char *_build_name(struct pool *mem, const char *vg,
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const char *lv, const char *layer)
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{
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size_t len = 0;
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int hyphens = 0;
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char *r, *out;
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_count_hyphens(vg, &len, &hyphens);
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_count_hyphens(lv, &len, &hyphens);
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if (layer && *layer)
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_count_hyphens(layer, &len, &hyphens);
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len += hyphens + 2;
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if (!(r = pool_alloc(mem, len))) {
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stack;
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return NULL;
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}
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out = r;
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_quote_hyphens(&out, vg);
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*out++ = '-';
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_quote_hyphens(&out, lv);
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if (layer && *layer) {
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*out++ = '-';
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_quote_hyphens(&out, layer);
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}
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*out = '\0';
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return r;
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}
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/* Find start of LV component in hyphenated name */
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static char *_find_lv_name(char *vg)
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{
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char *c = vg;
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while (*c && *(c + 1)) {
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if (*c == '-') {
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if (*(c + 1) == '-')
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c++;
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else
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return (c + 1);
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}
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c++;
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}
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return NULL;
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}
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static char *_build_dlid(struct pool *mem, const char *lvid, const char *layer)
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{
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char *dlid;
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size_t len;
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if (!layer)
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layer = "";
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len = strlen(lvid) + strlen(layer) + 2;
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if (!(dlid = pool_alloc(mem, len))) {
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stack;
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return NULL;
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}
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sprintf(dlid, "%s%s%s", lvid, (*layer) ? "-" : "", layer);
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return dlid;
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}
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/*
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* Low level device-layer operations.
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*/
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static struct dm_task *_setup_task(const char *name, const char *uuid, int task)
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{
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struct dm_task *dmt;
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if (!(dmt = dm_task_create(task))) {
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stack;
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return NULL;
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}
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if (name)
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dm_task_set_name(dmt, name);
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if (uuid && *uuid)
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dm_task_set_uuid(dmt, uuid);
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return dmt;
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}
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static int _info_run(const char *name, const char *uuid, struct dm_info *info,
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struct pool *mem, char **uuid_out)
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{
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int r = 0;
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struct dm_task *dmt;
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const char *u;
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if (!(dmt = _setup_task(name, uuid, DM_DEVICE_INFO))) {
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stack;
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return 0;
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}
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if (!dm_task_run(dmt)) {
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stack;
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goto out;
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}
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if (!dm_task_get_info(dmt, info)) {
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stack;
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goto out;
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}
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if (info->exists && uuid_out) {
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if (!(u = dm_task_get_uuid(dmt))) {
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stack;
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goto out;
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}
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*uuid_out = pool_strdup(mem, u);
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}
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r = 1;
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out:
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dm_task_destroy(dmt);
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return r;
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}
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static int _info(const char *name, const char *uuid, struct dm_info *info,
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struct pool *mem, char **uuid_out)
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{
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if (uuid && *uuid && _info_run(NULL, uuid, info, mem, uuid_out)
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&& info->exists)
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return 1;
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if (name)
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return _info_run(name, NULL, info, mem, uuid_out);
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return 0;
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}
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/* FIXME Interface must cope with multiple targets */
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static int _status_run(const char *name, const char *uuid,
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unsigned long long *s, unsigned long long *l,
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char **t, uint32_t t_size, char **p, uint32_t p_size)
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{
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int r = 0;
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struct dm_task *dmt;
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void *next = NULL;
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uint64_t start, length;
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char *type = NULL;
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char *params = NULL;
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if (!(dmt = _setup_task(name, uuid, DM_DEVICE_STATUS))) {
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stack;
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return 0;
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}
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if (!dm_task_run(dmt)) {
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stack;
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goto out;
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}
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do {
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next = dm_get_next_target(dmt, next, &start, &length,
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&type, ¶ms);
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if (type) {
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*s = start;
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*l = length;
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/* Make sure things are null terminated */
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strncpy(*t, type, t_size);
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(*t)[t_size - 1] = '\0';
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strncpy(*p, params, p_size);
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(*p)[p_size - 1] = '\0';
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r = 1;
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/* FIXME Cope with multiple targets! */
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break;
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}
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} while (next);
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out:
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dm_task_destroy(dmt);
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return r;
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}
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static int _status(const char *name, const char *uuid,
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unsigned long long *start, unsigned long long *length,
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char **type, uint32_t type_size, char **params,
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uint32_t param_size)
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{
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if (uuid && *uuid && _status_run(NULL, uuid, start, length, type,
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type_size, params, param_size)
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&& *params)
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return 1;
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if (name && _status_run(name, NULL, start, length, type, type_size,
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params, param_size))
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return 1;
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return 0;
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}
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static int _rename(struct dev_layer *dl, char *newname)
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{
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int r = 1;
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struct dm_task *dmt;
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log_verbose("Renaming %s to %s", dl->name, newname);
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if (!(dmt = _setup_task(dl->name, NULL, DM_DEVICE_RENAME))) {
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stack;
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return 0;
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}
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if (!dm_task_set_newname(dmt, newname)) {
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stack;
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r = 0;
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goto out;
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}
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if (!(r = dm_task_run(dmt)))
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log_error("Couldn't rename device '%s'.", dl->name);
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if (r && _get_flag(dl, VISIBLE))
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fs_rename_lv(dl->lv, newname, _find_lv_name(dl->name));
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dl->name = newname;
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out:
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dm_task_destroy(dmt);
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return r;
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}
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static int _load(struct dev_manager *dm, struct dev_layer *dl, int task)
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{
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int r = 1;
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struct dm_task *dmt;
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log_verbose("Loading %s", dl->name);
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if (!(dmt = _setup_task(task == DM_DEVICE_CREATE ? dl->name : NULL,
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dl->dlid, task))) {
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stack;
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return 0;
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}
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/*
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* Populate the table.
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*/
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if (!dl->populate(dm, dmt, dl)) {
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log_error("Couldn't populate device '%s'.", dl->name);
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r = 0;
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goto out;
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}
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/*
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* Do we want a specific device number ?
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*/
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if (dl->lv->major >= 0 && _get_flag(dl, VISIBLE)) {
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if (!dm_task_set_major(dmt, dl->lv->major)) {
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log_error("Failed to set major number for %s to %d "
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"during activation.", dl->name,
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dl->lv->major);
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goto out;
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} else
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log_very_verbose("Set major number for %s to %d.",
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dl->name, dl->lv->major);
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}
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if (dl->lv->minor >= 0 && _get_flag(dl, VISIBLE)) {
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if (!dm_task_set_minor(dmt, dl->lv->minor)) {
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log_error("Failed to set minor number for %s to %d "
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"during activation.", dl->name,
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dl->lv->minor);
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goto out;
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} else
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log_very_verbose("Set minor number for %s to %d.",
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dl->name, dl->lv->minor);
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}
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if (!_get_flag(dl, READWRITE)) {
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if (!dm_task_set_ro(dmt)) {
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log_error("Failed to set %s read-only during "
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"activation.", dl->name);
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goto out;
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} else
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log_very_verbose("Activating %s read-only", dl->name);
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}
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if (!(r = dm_task_run(dmt)))
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log_error("Couldn't load device '%s'.", dl->name);
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if (!dm_task_get_info(dmt, &dl->info)) {
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stack;
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r = 0;
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goto out;
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}
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if (r && _get_flag(dl, VISIBLE))
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fs_add_lv(dl->lv, dl->name);
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_clear_flag(dl, RELOAD);
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out:
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dm_task_destroy(dmt);
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return r;
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}
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static int _remove(struct dev_layer *dl)
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{
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int r;
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struct dm_task *dmt;
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if (_get_flag(dl, VISIBLE))
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log_verbose("Removing %s", dl->name);
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else
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log_very_verbose("Removing %s", dl->name);
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|
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if (!(dmt = _setup_task(dl->name, NULL, DM_DEVICE_REMOVE))) {
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stack;
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return 0;
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}
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|
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/* Suppress error message if it's still in use - we'll log it later */
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log_suppress(1);
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|
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if ((r = dm_task_run(dmt)))
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dl->info.exists = 0;
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|
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log_suppress(0);
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dm_task_destroy(dmt);
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|
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if (r && _get_flag(dl, VISIBLE))
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fs_del_lv(dl->lv);
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|
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_clear_flag(dl, ACTIVE);
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return r;
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}
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|
|
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static int _suspend_or_resume(const char *name, action_t suspend)
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{
|
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int r;
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struct dm_task *dmt;
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int sus = (suspend == SUSPEND) ? 1 : 0;
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int task = sus ? DM_DEVICE_SUSPEND : DM_DEVICE_RESUME;
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|
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log_very_verbose("%s %s", sus ? "Suspending" : "Resuming", name);
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if (!(dmt = _setup_task(name, NULL, task))) {
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stack;
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return 0;
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}
|
|
|
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if (!(r = dm_task_run(dmt)))
|
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log_error("Couldn't %s device '%s'", sus ? "suspend" : "resume",
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name);
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|
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dm_task_destroy(dmt);
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return r;
|
|
}
|
|
|
|
static int _suspend(struct dev_layer *dl)
|
|
{
|
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if (dl->info.suspended)
|
|
return 1;
|
|
|
|
if (!_suspend_or_resume(dl->name, SUSPEND)) {
|
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stack;
|
|
return 0;
|
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}
|
|
|
|
dl->info.suspended = 1;
|
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return 1;
|
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}
|
|
|
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static int _resume(struct dev_layer *dl)
|
|
{
|
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if (!dl->info.suspended)
|
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return 1;
|
|
|
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if (!_suspend_or_resume(dl->name, RESUME)) {
|
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stack;
|
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return 0;
|
|
}
|
|
|
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dl->info.suspended = 0;
|
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return 1;
|
|
}
|
|
|
|
/*
|
|
* The functions that populate the table in a dm_task as part of
|
|
* a create/reload.
|
|
*/
|
|
|
|
/*
|
|
* Emit a target for a given segment.
|
|
* FIXME: tidy this function.
|
|
*/
|
|
static int _emit_target(struct dm_task *dmt, struct lv_segment *seg)
|
|
{
|
|
char params[1024];
|
|
uint64_t esize = seg->lv->vg->extent_size;
|
|
uint32_t s, stripes = seg->stripes;
|
|
int w = 0, tw = 0;
|
|
const char *filler = "/dev/ioerror";
|
|
const char *target = NULL;
|
|
|
|
if (stripes == 1) {
|
|
if (!seg->area[0].pv) {
|
|
target = "error";
|
|
goto add_target;
|
|
} else
|
|
target = "linear";
|
|
} else if (stripes > 1) {
|
|
target = "striped";
|
|
if ((tw = lvm_snprintf(params, sizeof(params), "%u %u ",
|
|
stripes, seg->stripe_size)) < 0)
|
|
goto error;
|
|
w = tw;
|
|
}
|
|
|
|
for (s = 0; s < stripes; s++, w += tw) {
|
|
if (!seg->area[s].pv || !seg->area[s].pv->dev)
|
|
tw = lvm_snprintf(params + w, sizeof(params) - w,
|
|
"%s 0%s", filler,
|
|
s == (stripes - 1) ? "" : " ");
|
|
else
|
|
tw = lvm_snprintf(params + w, sizeof(params) - w,
|
|
"%s %" PRIu64 "%s",
|
|
dev_name(seg->area[s].pv->dev),
|
|
(seg->area[s].pv->pe_start +
|
|
(esize * seg->area[s].pe)),
|
|
s == (stripes - 1) ? "" : " ");
|
|
|
|
if (tw < 0)
|
|
goto error;
|
|
}
|
|
|
|
add_target:
|
|
log_debug("Adding target: %" PRIu64 " %" PRIu64 " %s %s",
|
|
esize * seg->le, esize * seg->len, target, params);
|
|
|
|
if (!dm_task_add_target(dmt, esize * seg->le, esize * seg->len,
|
|
target, params)) {
|
|
stack;
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
|
|
error:
|
|
log_error("Insufficient space to write target parameters.");
|
|
return 0;
|
|
}
|
|
|
|
static int _populate_vanilla(struct dev_manager *dm,
|
|
struct dm_task *dmt, struct dev_layer *dl)
|
|
{
|
|
struct list *segh;
|
|
struct lv_segment *seg;
|
|
struct logical_volume *lv = dl->lv;
|
|
|
|
list_iterate(segh, &lv->segments) {
|
|
seg = list_item(segh, struct lv_segment);
|
|
if (!_emit_target(dmt, seg)) {
|
|
log_error("Unable to build table for '%s'", lv->name);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int _populate_origin(struct dev_manager *dm,
|
|
struct dm_task *dmt, struct dev_layer *dl)
|
|
{
|
|
char *real;
|
|
char params[PATH_MAX + 32];
|
|
|
|
if (!(real = _build_name(dm->mem, dm->vg_name, dl->lv->name, "real"))) {
|
|
stack;
|
|
return 0;
|
|
}
|
|
|
|
if (lvm_snprintf(params, sizeof(params), "%s/%s", dm_dir(), real) == -1) {
|
|
log_error("Couldn't create origin device parameters for '%s'.",
|
|
real);
|
|
return 0;
|
|
}
|
|
|
|
log_debug("Adding target: 0 %" PRIu64 " snapshot-origin %s",
|
|
dl->lv->size, params);
|
|
if (!dm_task_add_target(dmt, UINT64_C(0), dl->lv->size,
|
|
"snapshot-origin", params)) {
|
|
stack;
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int _populate_snapshot(struct dev_manager *dm,
|
|
struct dm_task *dmt, struct dev_layer *dl)
|
|
{
|
|
char *origin, *cow;
|
|
char params[PATH_MAX * 2 + 32];
|
|
struct snapshot *s;
|
|
|
|
if (!(s = find_cow(dl->lv))) {
|
|
log_error("Couldn't find snapshot for '%s'.", dl->lv->name);
|
|
return 0;
|
|
}
|
|
|
|
if (!(origin = _build_name(dm->mem, dm->vg_name,
|
|
s->origin->name, "real"))) {
|
|
stack;
|
|
return 0;
|
|
}
|
|
|
|
if (!(cow = _build_name(dm->mem, dm->vg_name, s->cow->name, "cow"))) {
|
|
stack;
|
|
return 0;
|
|
}
|
|
|
|
if (snprintf(params, sizeof(params), "%s/%s %s/%s P %d",
|
|
dm_dir(), origin, dm_dir(), cow, s->chunk_size) == -1) {
|
|
stack;
|
|
return 0;
|
|
}
|
|
|
|
log_debug("Adding target: 0 %" PRIu64 " snapshot %s",
|
|
s->origin->size, params);
|
|
if (!dm_task_add_target
|
|
(dmt, UINT64_C(0), s->origin->size, "snapshot", params)) {
|
|
stack;
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* dev_manager implementation.
|
|
*/
|
|
struct dev_manager *dev_manager_create(const char *vg_name)
|
|
{
|
|
struct pool *mem;
|
|
struct dev_manager *dm;
|
|
|
|
if (!(mem = pool_create(16 * 1024))) {
|
|
stack;
|
|
return NULL;
|
|
}
|
|
|
|
if (!(dm = pool_alloc(mem, sizeof(*dm)))) {
|
|
stack;
|
|
goto bad;
|
|
}
|
|
|
|
dm->mem = mem;
|
|
|
|
if (!(dm->vg_name = pool_strdup(dm->mem, vg_name))) {
|
|
stack;
|
|
goto bad;
|
|
}
|
|
|
|
if (!(dm->layers = hash_create(32))) {
|
|
stack;
|
|
goto bad;
|
|
}
|
|
|
|
list_init(&dm->active_list);
|
|
list_init(&dm->reload_list);
|
|
list_init(&dm->remove_list);
|
|
list_init(&dm->suspend_list);
|
|
|
|
return dm;
|
|
|
|
bad:
|
|
pool_destroy(mem);
|
|
return NULL;
|
|
}
|
|
|
|
void dev_manager_destroy(struct dev_manager *dm)
|
|
{
|
|
hash_destroy(dm->layers);
|
|
pool_destroy(dm->mem);
|
|
}
|
|
|
|
int dev_manager_info(struct dev_manager *dm, const struct logical_volume *lv,
|
|
struct dm_info *info)
|
|
{
|
|
char *name;
|
|
|
|
/*
|
|
* Build a name for the top layer.
|
|
*/
|
|
if (!(name = _build_name(dm->mem, lv->vg->name, lv->name, NULL))) {
|
|
stack;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Try and get some info on this device.
|
|
*/
|
|
log_debug("Getting device info for %s", name);
|
|
if (!_info(name, lv->lvid.s, info, NULL, NULL)) {
|
|
stack;
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
int dev_manager_snapshot_percent(struct dev_manager *dm,
|
|
struct logical_volume *lv, float *percent)
|
|
{
|
|
char *name, *type, *params;
|
|
unsigned long long start, length;
|
|
|
|
/* FIXME: Use #defines - & move allocations into _status_run ? */
|
|
uint32_t type_size = 32;
|
|
uint32_t param_size = 32;
|
|
|
|
if (!(type = pool_alloc(dm->mem, sizeof(*type) * type_size))) {
|
|
stack;
|
|
return 0;
|
|
}
|
|
|
|
if (!(params = pool_alloc(dm->mem, sizeof(*params) * param_size))) {
|
|
stack;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Build a name for the top layer.
|
|
*/
|
|
if (!(name = _build_name(dm->mem, lv->vg->name, lv->name, NULL))) {
|
|
stack;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Try and get some info on this device.
|
|
*/
|
|
log_debug("Getting device status for %s", name);
|
|
if (!(_status(name, lv->lvid.s, &start, &length, &type, type_size,
|
|
¶ms, param_size))) {
|
|
stack;
|
|
return 0;
|
|
}
|
|
|
|
/* FIXME Ensure this is a *snapshot* target with percentage! */
|
|
/* FIXME pool_free ? */
|
|
|
|
/* If the snapshot isn't available, percent will be -1 */
|
|
*percent = -1;
|
|
|
|
if (!params)
|
|
return 0;
|
|
|
|
return sscanf(params, "%f", percent);
|
|
}
|
|
|
|
static struct dev_layer *_create_dev(struct dev_manager *dm, char *name,
|
|
const char *dlid)
|
|
{
|
|
struct dev_layer *dl;
|
|
char *uuid;
|
|
|
|
if (!(dl = pool_zalloc(dm->mem, sizeof(*dl)))) {
|
|
stack;
|
|
return NULL;
|
|
}
|
|
|
|
dl->name = name;
|
|
|
|
log_debug("Getting device info for %s", dl->name);
|
|
if (!_info(dl->name, dlid, &dl->info, dm->mem, &uuid)) {
|
|
stack;
|
|
return NULL;
|
|
}
|
|
|
|
if (dl->info.exists)
|
|
dl->dlid = uuid;
|
|
else
|
|
dl->dlid = dlid;
|
|
|
|
list_init(&dl->pre_create);
|
|
|
|
if (!hash_insert(dm->layers, dl->dlid, dl)) {
|
|
stack;
|
|
return NULL;
|
|
}
|
|
|
|
return dl;
|
|
}
|
|
|
|
static inline int _read_only_lv(struct logical_volume *lv)
|
|
{
|
|
return (!(lv->vg->status & LVM_WRITE) || !(lv->status & LVM_WRITE));
|
|
}
|
|
|
|
static struct dev_layer *_create_layer(struct dev_manager *dm,
|
|
const char *layer,
|
|
struct logical_volume *lv)
|
|
{
|
|
char *name, *dlid;
|
|
struct dev_layer *dl;
|
|
|
|
if (!(name = _build_name(dm->mem, lv->vg->name, lv->name, layer))) {
|
|
stack;
|
|
return NULL;
|
|
}
|
|
|
|
if (!(dlid = _build_dlid(dm->mem, lv->lvid.s, layer))) {
|
|
stack;
|
|
return NULL;
|
|
}
|
|
|
|
if (!(dl = hash_lookup(dm->layers, dlid)) &&
|
|
!(dl = _create_dev(dm, name, dlid))) {
|
|
stack;
|
|
return NULL;
|
|
}
|
|
|
|
dl->lv = lv;
|
|
|
|
if (!_read_only_lv(lv))
|
|
_set_flag(dl, READWRITE);
|
|
|
|
return dl;
|
|
}
|
|
|
|
/*
|
|
* Finds the specified layer.
|
|
*/
|
|
static struct dev_layer *_lookup(struct dev_manager *dm,
|
|
const char *lvid, const char *layer)
|
|
{
|
|
char *dlid;
|
|
struct dev_layer *dl;
|
|
|
|
if (!(dlid = _build_dlid(dm->mem, lvid, layer))) {
|
|
stack;
|
|
return NULL;
|
|
}
|
|
|
|
dl = hash_lookup(dm->layers, dlid);
|
|
pool_free(dm->mem, dlid);
|
|
return dl;
|
|
}
|
|
|
|
static int _expand_vanilla(struct dev_manager *dm, struct logical_volume *lv)
|
|
{
|
|
/*
|
|
* only one layer.
|
|
*/
|
|
struct dev_layer *dl;
|
|
|
|
if (!(dl = _create_layer(dm, NULL, lv))) {
|
|
stack;
|
|
return 0;
|
|
}
|
|
dl->populate = _populate_vanilla;
|
|
_set_flag(dl, VISIBLE);
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int _expand_origin_real(struct dev_manager *dm,
|
|
struct logical_volume *lv)
|
|
{
|
|
struct dev_layer *dl;
|
|
const char *real_dlid;
|
|
|
|
if (!(dl = _create_layer(dm, "real", lv))) {
|
|
stack;
|
|
return 0;
|
|
}
|
|
dl->populate = _populate_vanilla;
|
|
_clear_flag(dl, VISIBLE);
|
|
|
|
real_dlid = dl->dlid;
|
|
|
|
if (!(dl = _create_layer(dm, NULL, lv))) {
|
|
stack;
|
|
return 0;
|
|
}
|
|
dl->populate = _populate_origin;
|
|
_set_flag(dl, VISIBLE);
|
|
|
|
/* add the dependency on the real device */
|
|
if (!_pre_list_add(dm->mem, &dl->pre_create,
|
|
pool_strdup(dm->mem, real_dlid))) {
|
|
stack;
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int _expand_origin(struct dev_manager *dm, struct logical_volume *lv)
|
|
{
|
|
struct logical_volume *active;
|
|
struct snapshot *s;
|
|
struct list *sh;
|
|
|
|
/*
|
|
* We only need to create an origin layer if one of our
|
|
* snapshots is in the active list.
|
|
*/
|
|
list_iterate(sh, &dm->active_list) {
|
|
active = list_item(sh, struct lv_list)->lv;
|
|
if ((s = find_cow(active)) && (s->origin == lv))
|
|
return _expand_origin_real(dm, lv);
|
|
}
|
|
|
|
return _expand_vanilla(dm, lv);
|
|
}
|
|
|
|
static int _expand_snapshot(struct dev_manager *dm, struct logical_volume *lv,
|
|
struct snapshot *s)
|
|
{
|
|
/*
|
|
* snapshot(org, cow)
|
|
* cow
|
|
*/
|
|
struct dev_layer *dl;
|
|
const char *cow_dlid;
|
|
|
|
if (!(dl = _create_layer(dm, "cow", lv))) {
|
|
stack;
|
|
return 0;
|
|
}
|
|
dl->populate = _populate_vanilla;
|
|
_clear_flag(dl, VISIBLE);
|
|
|
|
cow_dlid = dl->dlid;
|
|
|
|
if (!(dl = _create_layer(dm, NULL, lv))) {
|
|
stack;
|
|
return 0;
|
|
}
|
|
dl->populate = _populate_snapshot;
|
|
_set_flag(dl, VISIBLE);
|
|
|
|
/* add the dependency on the real device */
|
|
if (!_pre_list_add(dm->mem, &dl->pre_create,
|
|
pool_strdup(dm->mem, cow_dlid))) {
|
|
stack;
|
|
return 0;
|
|
}
|
|
|
|
/* add the dependency on the org device */
|
|
if (!_pre_list_add(dm->mem, &dl->pre_create,
|
|
_build_dlid(dm->mem, s->origin->lvid.s, "real"))) {
|
|
stack;
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Inserts the appropriate dev_layers for a logical volume.
|
|
*/
|
|
static int _expand_lv(struct dev_manager *dm, struct logical_volume *lv)
|
|
{
|
|
struct snapshot *s;
|
|
|
|
/*
|
|
* FIXME: this doesn't cope with recursive snapshots yet.
|
|
*/
|
|
if ((s = find_cow(lv)))
|
|
return _expand_snapshot(dm, lv, s);
|
|
|
|
else if (lv_is_origin(lv))
|
|
return _expand_origin(dm, lv);
|
|
|
|
return _expand_vanilla(dm, lv);
|
|
}
|
|
|
|
/*
|
|
* Clears the mark bit on all layers.
|
|
*/
|
|
static void _clear_marks(struct dev_manager *dm, int flag)
|
|
{
|
|
struct hash_node *hn;
|
|
struct dev_layer *dl;
|
|
|
|
hash_iterate(hn, dm->layers) {
|
|
dl = hash_get_data(dm->layers, hn);
|
|
_clear_flag(dl, flag);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Propogates marks via the pre_create dependency list.
|
|
*/
|
|
static int _trace_layer_marks(struct dev_manager *dm, struct dev_layer *dl,
|
|
int flag)
|
|
{
|
|
struct list *sh;
|
|
char *dlid;
|
|
struct dev_layer *dep;
|
|
|
|
list_iterate(sh, &dl->pre_create) {
|
|
dlid = list_item(sh, struct str_list)->str;
|
|
|
|
if (!(dep = hash_lookup(dm->layers, dlid))) {
|
|
log_error("Couldn't find device layer '%s'.", dlid);
|
|
return 0;
|
|
}
|
|
|
|
if (_get_flag(dep, flag))
|
|
continue;
|
|
|
|
_set_flag(dep, flag);
|
|
|
|
if (!_trace_layer_marks(dm, dep, flag)) {
|
|
stack;
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Calls _trace_single for every marked layer.
|
|
*/
|
|
static int _trace_all_marks(struct dev_manager *dm, int flag)
|
|
{
|
|
struct hash_node *hn;
|
|
struct dev_layer *dl;
|
|
|
|
hash_iterate(hn, dm->layers) {
|
|
dl = hash_get_data(dm->layers, hn);
|
|
if (_get_flag(dl, flag) && !_trace_layer_marks(dm, dl, flag)) {
|
|
stack;
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Marks the top layers, then traces these through the
|
|
* dependencies.
|
|
*/
|
|
static int _mark_lvs(struct dev_manager *dm, struct list *lvs, int flag)
|
|
{
|
|
struct list *lvh;
|
|
struct logical_volume *lv;
|
|
struct dev_layer *dl;
|
|
|
|
list_iterate(lvh, lvs) {
|
|
lv = list_item(lvh, struct lv_list)->lv;
|
|
|
|
if (!(dl = _lookup(dm, lv->lvid.s, NULL))) {
|
|
stack;
|
|
return 0;
|
|
}
|
|
|
|
_set_flag(dl, flag);
|
|
}
|
|
|
|
if (!_trace_all_marks(dm, flag)) {
|
|
stack;
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static inline int _suspend_parent(struct dev_layer *parent)
|
|
{
|
|
return (!parent || !parent->info.exists || _suspend(parent));
|
|
}
|
|
|
|
/*
|
|
* Recurses through the tree, ensuring that devices are created
|
|
* in correct order.
|
|
*/
|
|
static int _create_rec(struct dev_manager *dm, struct dev_layer *dl,
|
|
struct dev_layer *parent)
|
|
{
|
|
struct list *sh;
|
|
struct dev_layer *dep;
|
|
char *dlid, *newname, *suffix;
|
|
|
|
/* FIXME Create and use a _suspend_parents() function instead */
|
|
/* Suspend? */
|
|
if (_get_flag(dl, SUSPENDED) && (!_suspend_parent || !_suspend(dl))) {
|
|
stack;
|
|
return 0;
|
|
}
|
|
|
|
list_iterate(sh, &dl->pre_create) {
|
|
dlid = list_item(sh, struct str_list)->str;
|
|
|
|
if (!(dep = hash_lookup(dm->layers, dlid))) {
|
|
log_error("Couldn't find device layer '%s'.", dlid);
|
|
return 0;
|
|
}
|
|
|
|
if (!_suspend_parent(parent)) {
|
|
stack;
|
|
return 0;
|
|
}
|
|
|
|
if (!strcmp(dep->dlid, dl->dlid)) {
|
|
log_error("BUG: pre-create loop detected (%s)", dlid);
|
|
return 0;
|
|
}
|
|
|
|
if (!_create_rec(dm, dep, dl)) {
|
|
stack;
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/* Rename? */
|
|
if (dl->info.exists) {
|
|
if ((suffix = rindex(dl->dlid, '-')))
|
|
suffix++;
|
|
newname = _build_name(dm->mem, dm->vg_name, dl->lv->name,
|
|
suffix);
|
|
if (strcmp(newname, dl->name)) {
|
|
if (!_suspend_parent(parent) ||
|
|
!_suspend(dl) || !_rename(dl, newname)) {
|
|
stack;
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Create? */
|
|
if (!dl->info.exists) {
|
|
if (!_suspend_parent(parent) ||
|
|
!_load(dm, dl, DM_DEVICE_CREATE)) {
|
|
stack;
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
/* Reload? */
|
|
if (_get_flag(dl, RELOAD) &&
|
|
(!_suspend_parent(parent) || !_suspend(dl) ||
|
|
!_load(dm, dl, DM_DEVICE_RELOAD))) {
|
|
stack;
|
|
return 0;
|
|
}
|
|
|
|
/* Resume? */
|
|
if (!_get_flag(dl, SUSPENDED) && (!_suspend_parent || !_resume(dl))) {
|
|
stack;
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int _build_all_layers(struct dev_manager *dm, struct volume_group *vg)
|
|
{
|
|
struct list *lvh;
|
|
struct logical_volume *lvt;
|
|
|
|
/*
|
|
* Build layers for complete vg.
|
|
*/
|
|
list_iterate(lvh, &vg->lvs) {
|
|
lvt = list_item(lvh, struct lv_list)->lv;
|
|
if (!_expand_lv(dm, lvt)) {
|
|
stack;
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int _fill_in_remove_list(struct dev_manager *dm)
|
|
{
|
|
struct hash_node *hn;
|
|
struct dev_layer *dl;
|
|
struct dl_list *dll;
|
|
|
|
hash_iterate(hn, dm->layers) {
|
|
dl = hash_get_data(dm->layers, hn);
|
|
|
|
if (!_get_flag(dl, ACTIVE)) {
|
|
dll = pool_alloc(dm->mem, sizeof(*dll));
|
|
if (!dll) {
|
|
stack;
|
|
return 0;
|
|
}
|
|
|
|
dll->dl = dl;
|
|
list_add(&dm->remove_list, &dll->list);
|
|
}
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Layers are removed in a top-down manner.
|
|
*/
|
|
static int _remove_old_layers(struct dev_manager *dm)
|
|
{
|
|
int change;
|
|
struct list *rh, *n;
|
|
struct dev_layer *dl;
|
|
|
|
do {
|
|
change = 0;
|
|
list_iterate_safe(rh, n, &dm->remove_list) {
|
|
dl = list_item(rh, struct dl_list)->dl;
|
|
|
|
if (!dl->info.exists) {
|
|
list_del(rh);
|
|
continue;
|
|
}
|
|
|
|
if (_remove(dl)) {
|
|
change = 1;
|
|
list_del(rh);
|
|
}
|
|
}
|
|
|
|
} while (change);
|
|
|
|
if (!list_empty(&dm->remove_list)) {
|
|
list_iterate(rh, &dm->remove_list) {
|
|
dl = list_item(rh, struct dl_list)->dl;
|
|
log_error("Couldn't deactivate device %s", dl->name);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* The guts of the activation unit, this examines the device
|
|
* layers in the manager, and tries to issue the correct
|
|
* instructions to activate them in order.
|
|
*/
|
|
static int _execute(struct dev_manager *dm, struct volume_group *vg)
|
|
{
|
|
struct hash_node *hn;
|
|
struct dev_layer *dl;
|
|
|
|
if (!_build_all_layers(dm, vg)) {
|
|
stack;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Mark all layer that need reloading.
|
|
*/
|
|
_clear_marks(dm, RELOAD);
|
|
if (!_mark_lvs(dm, &dm->reload_list, RELOAD)) {
|
|
stack;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Mark all layers that should be active.
|
|
*/
|
|
_clear_marks(dm, ACTIVE);
|
|
if (!_mark_lvs(dm, &dm->active_list, ACTIVE)) {
|
|
stack;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Mark all layers that should be left suspended.
|
|
*/
|
|
_clear_marks(dm, SUSPENDED);
|
|
if (!_mark_lvs(dm, &dm->suspend_list, SUSPENDED)) {
|
|
stack;
|
|
return 0;
|
|
}
|
|
|
|
if (!_fill_in_remove_list(dm)) {
|
|
stack;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Now only top level devices will be unmarked.
|
|
*/
|
|
hash_iterate(hn, dm->layers) {
|
|
dl = hash_get_data(dm->layers, hn);
|
|
|
|
if (_get_flag(dl, ACTIVE) && _get_flag(dl, VISIBLE))
|
|
_create_rec(dm, dl, NULL);
|
|
}
|
|
|
|
if (!_remove_old_layers(dm)) {
|
|
stack;
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* ATM we decide which vg a layer belongs to by
|
|
* looking at the beginning of the device
|
|
* name.
|
|
*/
|
|
static int _belong_to_vg(const char *vgname, const char *name)
|
|
{
|
|
const char *v = vgname, *n = name;
|
|
|
|
while (*v) {
|
|
if ((*v != *n) || (*v == '-' && *(++n) != '-'))
|
|
return 0;
|
|
v++, n++;
|
|
}
|
|
|
|
if (*n == '-' && *(n + 1) != '-')
|
|
return 1;
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
static int _add_existing_layer(struct dev_manager *dm, const char *name)
|
|
{
|
|
struct dev_layer *dl;
|
|
char *copy;
|
|
|
|
log_debug("Found existing layer '%s'", name);
|
|
|
|
if (!(copy = pool_strdup(dm->mem, name))) {
|
|
stack;
|
|
return 0;
|
|
}
|
|
|
|
if (!(dl = _create_dev(dm, copy, ""))) {
|
|
stack;
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int _scan_existing_devices(struct dev_manager *dm)
|
|
{
|
|
const char *dev_dir = dm_dir();
|
|
|
|
int r = 1;
|
|
const char *name;
|
|
struct dirent *dirent;
|
|
DIR *d;
|
|
|
|
if (!(d = opendir(dev_dir))) {
|
|
log_sys_error("opendir", dev_dir);
|
|
return 0;
|
|
}
|
|
|
|
while ((dirent = readdir(d))) {
|
|
name = dirent->d_name;
|
|
|
|
if (name[0] == '.')
|
|
continue;
|
|
|
|
/*
|
|
* Does this layer belong to us ?
|
|
*/
|
|
if (_belong_to_vg(dm->vg_name, name) &&
|
|
!_add_existing_layer(dm, name)) {
|
|
stack;
|
|
r = 0;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (closedir(d))
|
|
log_sys_error("closedir", dev_dir);
|
|
|
|
return r;
|
|
}
|
|
|
|
static int _add_lv(struct pool *mem,
|
|
struct list *head, struct logical_volume *lv)
|
|
{
|
|
struct lv_list *lvl;
|
|
|
|
if (!(lvl = pool_alloc(mem, sizeof(*lvl)))) {
|
|
stack;
|
|
return 0;
|
|
}
|
|
|
|
lvl->lv = lv;
|
|
list_add(head, &lvl->list);
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int _add_lvs(struct pool *mem,
|
|
struct list *head, struct logical_volume *origin)
|
|
{
|
|
struct logical_volume *lv;
|
|
struct snapshot *s;
|
|
struct list *lvh;
|
|
|
|
list_iterate(lvh, &origin->vg->lvs) {
|
|
lv = list_item(lvh, struct lv_list)->lv;
|
|
if ((s = find_cow(lv)) && s->origin == origin)
|
|
if (!_add_lv(mem, head, lv))
|
|
return 0;
|
|
}
|
|
|
|
return _add_lv(mem, head, origin);
|
|
}
|
|
|
|
static void _remove_lv(struct list *head, struct logical_volume *lv)
|
|
{
|
|
struct list *lvh;
|
|
struct lv_list *lvl;
|
|
|
|
list_iterate(lvh, head) {
|
|
lvl = list_item(lvh, struct lv_list);
|
|
if (lvl->lv == lv) {
|
|
list_del(lvh);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
static int _remove_lvs(struct dev_manager *dm, struct logical_volume *lv)
|
|
{
|
|
struct logical_volume *active, *old_origin;
|
|
struct snapshot *s;
|
|
struct list *sh, *active_head;
|
|
|
|
active_head = &dm->active_list;
|
|
|
|
/* Remove any snapshots with given origin */
|
|
list_iterate(sh, active_head) {
|
|
active = list_item(sh, struct lv_list)->lv;
|
|
if ((s = find_cow(active)) && s->origin == lv) {
|
|
_remove_lv(active_head, active);
|
|
}
|
|
}
|
|
|
|
_remove_lv(active_head, lv);
|
|
|
|
if (!(s = find_cow(lv)))
|
|
return 1;
|
|
|
|
old_origin = s->origin;
|
|
|
|
/* Was this the last active snapshot with this origin? */
|
|
list_iterate(sh, active_head) {
|
|
active = list_item(sh, struct lv_list)->lv;
|
|
if ((s = find_cow(active)) && s->origin == old_origin) {
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
return _add_lvs(dm->mem, &dm->reload_list, old_origin);
|
|
}
|
|
|
|
static int _fill_in_active_list(struct dev_manager *dm, struct volume_group *vg)
|
|
{
|
|
int found;
|
|
char *dlid;
|
|
struct list *lvh;
|
|
struct logical_volume *lv;
|
|
|
|
list_iterate(lvh, &vg->lvs) {
|
|
lv = list_item(lvh, struct lv_list)->lv;
|
|
|
|
if (!(dlid = _build_dlid(dm->mem, lv->lvid.s, NULL))) {
|
|
stack;
|
|
return 0;
|
|
}
|
|
|
|
found = hash_lookup(dm->layers, dlid) ? 1 : 0;
|
|
pool_free(dm->mem, dlid);
|
|
|
|
if (found) {
|
|
log_debug("Found active lv %s", lv->name);
|
|
|
|
if (!_add_lv(dm->mem, &dm->active_list, lv)) {
|
|
stack;
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int _action(struct dev_manager *dm, struct logical_volume *lv,
|
|
action_t action)
|
|
{
|
|
if (!_scan_existing_devices(dm)) {
|
|
stack;
|
|
return 0;
|
|
}
|
|
|
|
if (!_fill_in_active_list(dm, lv->vg)) {
|
|
stack;
|
|
return 0;
|
|
}
|
|
|
|
if (action == ACTIVATE || action == DEACTIVATE)
|
|
/* Get into known state - remove from active list if present */
|
|
if (!_remove_lvs(dm, lv)) {
|
|
stack;
|
|
return 0;
|
|
}
|
|
|
|
if (action == ACTIVATE) {
|
|
/* Add to active & reload lists */
|
|
if (!_add_lvs(dm->mem, &dm->reload_list, lv) ||
|
|
!_add_lvs(dm->mem, &dm->active_list, lv)) {
|
|
stack;
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
if (action == SUSPEND) {
|
|
if (!_add_lvs(dm->mem, &dm->suspend_list, lv)) {
|
|
stack;
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
if (!_execute(dm, lv->vg)) {
|
|
stack;
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
int dev_manager_activate(struct dev_manager *dm, struct logical_volume *lv)
|
|
{
|
|
return _action(dm, lv, ACTIVATE);
|
|
}
|
|
|
|
int dev_manager_deactivate(struct dev_manager *dm, struct logical_volume *lv)
|
|
{
|
|
return _action(dm, lv, DEACTIVATE);
|
|
}
|
|
|
|
int dev_manager_suspend(struct dev_manager *dm, struct logical_volume *lv)
|
|
{
|
|
return _action(dm, lv, SUSPEND);
|
|
}
|