summaryrefslogtreecommitdiffstats
path: root/libblkid/partitions.c
diff options
context:
space:
mode:
Diffstat (limited to 'libblkid/partitions.c')
-rw-r--r--libblkid/partitions.c1385
1 files changed, 0 insertions, 1385 deletions
diff --git a/libblkid/partitions.c b/libblkid/partitions.c
deleted file mode 100644
index 93ec4d224..000000000
--- a/libblkid/partitions.c
+++ /dev/null
@@ -1,1385 +0,0 @@
-/*
- * partitions - partition tables parsing
- *
- * Copyright (C) 2008-2009 Karel Zak <kzak@redhat.com>
- *
- * This file may be redistributed under the terms of the
- * GNU Lesser General Public License.
- *
- */
-#include <stdio.h>
-#include <string.h>
-#include <stdlib.h>
-#include <unistd.h>
-#include <fcntl.h>
-#include <ctype.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <errno.h>
-#include <stdint.h>
-#include <inttypes.h>
-#include <stdarg.h>
-
-#include "partitions.h"
-#include "sysfs.h"
-
-/**
- * SECTION: partitions
- * @title: Partitions probing
- * @short_description: partitions tables detection and parsing
- *
- * This chain supports binary and NAME=value interfaces, but complete PT
- * description is provided by binary interface only. The libblkid prober is
- * compatible with kernel partition tables parser. The parser does not return
- * empty (size=0) partitions or special hidden partitions.
- *
- * NAME=value interface, supported tags:
- *
- * @PTTYPE: partition table type (dos, gpt, etc.).
- *
- * @PART_ENTRY_SCHEME: partition table type
- *
- * @PART_ENTRY_NAME: partition name (gpt and mac only)
- *
- * @PART_ENTRY_UUID: partition UUID (gpt only)
- *
- * @PART_ENTRY_TYPE: partition type, 0xNN (e.g 0x82) or type UUID (gpt only) or type string (mac)
- *
- * @PART_ENTRY_FLAGS: partition flags (e.g. boot_ind) or attributes (e.g. gpt attributes)
- *
- * @PART_ENTRY_NUMBER: partition number
- *
- * @PART_ENTRY_OFFSET: the begin of the partition
- *
- * @PART_ENTRY_SIZE: size of the partition
- *
- * @PART_ENTRY_DISK: whole-disk maj:min
- *
- * Example:
- *
- * <informalexample>
- * <programlisting>
- * blkid_probe pr;
- * const char *ptname;
- *
- * pr = blkid_new_probe_from_filename(devname);
- * if (!pr)
- * err("%s: faild to open device", devname);
- *
- * blkid_probe_enable_partitions(pr, TRUE);
- * blkid_do_fullprobe(pr);
- *
- * blkid_probe_lookup_value(pr, "PTTYPE", &ptname, NULL);
- * printf("%s partition type detected\n", pttype);
- *
- * blkid_free_probe(pr);
- *
- * // don't forget to check return codes in your code!
- * </programlisting>
- * </informalexample>
- *
- * Binary interface:
- *
- * <informalexample>
- * <programlisting>
- * blkid_probe pr;
- * blkid_partlist ls;
- * int nparts, i;
- *
- * pr = blkid_new_probe_from_filename(devname);
- * if (!pr)
- * err("%s: faild to open device", devname);
- *
- * ls = blkid_probe_get_partitions(pr);
- * nparts = blkid_partlist_numof_partitions(ls);
- *
- * for (i = 0; i < nparts; i++) {
- * blkid_partition par = blkid_partlist_get_partition(ls, i);
- * printf("#%d: %llu %llu 0x%x",
- * blkid_partition_get_partno(par),
- * blkid_partition_get_start(par),
- * blkid_partition_get_size(par),
- * blkid_partition_get_type(par));
- * }
- *
- * blkid_free_probe(pr);
- *
- * // don't forget to check return codes in your code!
- * </programlisting>
- * </informalexample>
- */
-
-/*
- * Chain driver function
- */
-static int partitions_probe(blkid_probe pr, struct blkid_chain *chn);
-static void partitions_free_data(blkid_probe pr, void *data);
-
-/*
- * Partitions chain probing functions
- */
-static const struct blkid_idinfo *idinfos[] =
-{
- &aix_pt_idinfo,
- &sgi_pt_idinfo,
- &sun_pt_idinfo,
- &dos_pt_idinfo,
- &gpt_pt_idinfo,
- &mac_pt_idinfo,
- &ultrix_pt_idinfo,
- &bsd_pt_idinfo,
- &unixware_pt_idinfo,
- &solaris_x86_pt_idinfo,
- &minix_pt_idinfo
-};
-
-/*
- * Driver definition
- */
-const struct blkid_chaindrv partitions_drv = {
- .id = BLKID_CHAIN_PARTS,
- .name = "partitions",
- .dflt_enabled = FALSE,
- .idinfos = idinfos,
- .nidinfos = ARRAY_SIZE(idinfos),
- .has_fltr = TRUE,
- .probe = partitions_probe,
- .safeprobe = partitions_probe,
- .free_data = partitions_free_data
-};
-
-
-/*
- * For compatibility with the rest of libblkid API (with the old high-level
- * API) we use completely opaque typedefs for all structs. Don't forget that
- * the final blkid_* types are pointers! See blkid.h.
- *
- * [Just for the record, I hate typedef for pointers --kzak]
- */
-
-/* exported as opaque type "blkid_parttable" */
-struct blkid_struct_parttable {
- const char *type; /* partition table type */
- blkid_loff_t offset; /* begin of the partition table */
- int nparts; /* number of partitions */
- blkid_partition parent; /* parent of nested partition table */
- char id[37]; /* PT identifier (e.g. UUID for GPT) */
-
- struct list_head t_tabs; /* all tables */
-};
-
-/* exported as opaque type "blkid_partition" */
-struct blkid_struct_partition {
- blkid_loff_t start; /* begin of the partition */
- blkid_loff_t size; /* size of the partitions */
-
- int type; /* partition type */
- char typestr[37]; /* partition type string (GPT and Mac) */
-
- unsigned long long flags; /* partition flags / attributes */
-
- int partno; /* partition number */
- char uuid[37]; /* UUID (when supported by PT), e.g GPT */
- unsigned char name[128]; /* Partition in UTF8 name (when supporte by PT), e.g. Mac */
-
- blkid_parttable tab; /* partition table */
-};
-
-/* exported as opaque type "blkid_partlist" */
-struct blkid_struct_partlist {
- int next_partno; /* next partition number */
- blkid_partition next_parent; /* next parent if parsing nested PT */
-
- int nparts; /* number of partitions */
- int nparts_max; /* max.number of partitions */
- blkid_partition parts; /* array of partitions */
-
- struct list_head l_tabs; /* list of partition tables */
-};
-
-static int blkid_partitions_probe_partition(blkid_probe pr);
-
-/**
- * blkid_probe_enable_partitions:
- * @pr: probe
- * @enable: TRUE/FALSE
- *
- * Enables/disables the partitions probing for non-binary interface.
- *
- * Returns: 0 on success, or -1 in case of error.
- */
-int blkid_probe_enable_partitions(blkid_probe pr, int enable)
-{
- if (!pr)
- return -1;
- pr->chains[BLKID_CHAIN_PARTS].enabled = enable;
- return 0;
-}
-
-/**
- * blkid_probe_set_partitions_flags:
- * @pr: prober
- * @flags: BLKID_PARTS_* flags
- *
- * Sets probing flags to the partitions prober. This function is optional.
- *
- * Returns: 0 on success, or -1 in case of error.
- */
-int blkid_probe_set_partitions_flags(blkid_probe pr, int flags)
-{
- if (!pr)
- return -1;
- pr->chains[BLKID_CHAIN_PARTS].flags = flags;
- return 0;
-}
-
-/**
- * blkid_probe_reset_partitions_filter:
- * @pr: prober
- *
- * Resets partitions probing filter
- *
- * Returns: 0 on success, or -1 in case of error.
- */
-int blkid_probe_reset_partitions_filter(blkid_probe pr)
-{
- return __blkid_probe_reset_filter(pr, BLKID_CHAIN_PARTS);
-}
-
-/**
- * blkid_probe_invert_partitions_filter:
- * @pr: prober
- *
- * Inverts partitions probing filter
- *
- * Returns: 0 on success, or -1 in case of error.
- */
-int blkid_probe_invert_partitions_filter(blkid_probe pr)
-{
- return __blkid_probe_invert_filter(pr, BLKID_CHAIN_PARTS);
-}
-
-/**
- * blkid_probe_filter_partitions_type:
- * @pr: prober
- * @flag: filter BLKID_FLTR_{NOTIN,ONLYIN} flag
- * @names: NULL terminated array of probing function names (e.g. "vfat").
- *
- * %BLKID_FLTR_NOTIN - probe for all items which are NOT IN @names
- *
- * %BLKID_FLTR_ONLYIN - probe for items which are IN @names
- *
- * Returns: 0 on success, or -1 in case of error.
- */
-int blkid_probe_filter_partitions_type(blkid_probe pr, int flag, char *names[])
-{
- return __blkid_probe_filter_types(pr, BLKID_CHAIN_PARTS, flag, names);
-}
-
-/**
- * blkid_probe_get_partitions:
- * @pr: probe
- *
- * This is a binary interface for partitions. See also blkid_partlist_*
- * functions.
- *
- * This function is independent on blkid_do_[safe,full]probe() and
- * blkid_probe_enable_partitions() calls.
- *
- * WARNING: the returned object will be overwritten by the next
- * blkid_probe_get_partitions() call for the same @pr. If you want to
- * use more blkid_partlist objects in the same time you have to create
- * more blkid_probe handlers (see blkid_new_probe()).
- *
- * Returns: list of partitions, or NULL in case of error.
- */
-blkid_partlist blkid_probe_get_partitions(blkid_probe pr)
-{
- return (blkid_partlist) blkid_probe_get_binary_data(pr,
- &pr->chains[BLKID_CHAIN_PARTS]);
-}
-
-/* for internal usage only */
-blkid_partlist blkid_probe_get_partlist(blkid_probe pr)
-{
- return (blkid_partlist) pr->chains[BLKID_CHAIN_PARTS].data;
-}
-
-static void blkid_probe_set_partlist(blkid_probe pr, blkid_partlist ls)
-{
- pr->chains[BLKID_CHAIN_PARTS].data = ls;
-}
-
-static void ref_parttable(blkid_parttable tab)
-{
- tab->nparts++;
-}
-
-static void unref_parttable(blkid_parttable tab)
-{
- tab->nparts--;
-
- if (tab->nparts <= 0) {
- list_del(&tab->t_tabs);
- free(tab);
- }
-}
-
-/* free all allocated parttables */
-static void free_parttables(blkid_partlist ls)
-{
- if (!ls || !ls->l_tabs.next)
- return;
-
- /* remove unassigned partition tables */
- while (!list_empty(&ls->l_tabs)) {
- blkid_parttable tab = list_entry(ls->l_tabs.next,
- struct blkid_struct_parttable, t_tabs);
- unref_parttable(tab);
- }
-}
-
-static void reset_partlist(blkid_partlist ls)
-{
- if (!ls)
- return;
-
- free_parttables(ls);
-
- if (ls->next_partno) {
- /* already initialized - reset */
- int tmp_nparts = ls->nparts_max;
- blkid_partition tmp_parts = ls->parts;
-
- memset(ls, 0, sizeof(struct blkid_struct_partlist));
-
- ls->nparts_max = tmp_nparts;
- ls->parts = tmp_parts;
- }
-
- ls->nparts = 0;
- ls->next_partno = 1;
- INIT_LIST_HEAD(&ls->l_tabs);
-
- DBG(DEBUG_LOWPROBE, printf("partlist reset\n"));
-}
-
-static blkid_partlist partitions_init_data(struct blkid_chain *chn)
-{
- blkid_partlist ls;
-
- if (chn->data)
- ls = (blkid_partlist) chn->data;
- else {
- /* allocate the new list of partitions */
- ls = calloc(1, sizeof(struct blkid_struct_partlist));
- if (!ls)
- return NULL;
- chn->data = (void *) ls;
- }
-
- reset_partlist(ls);
-
- DBG(DEBUG_LOWPROBE,
- printf("parts: initialized partitions list (%p, size=%d)\n",
- ls, ls->nparts_max));
- return ls;
-}
-
-static void partitions_free_data(blkid_probe pr __attribute__((__unused__)),
- void *data)
-{
- blkid_partlist ls = (blkid_partlist) data;
-
- if (!ls)
- return;
-
- free_parttables(ls);
-
- /* deallocate partitions and partlist */
- free(ls->parts);
- free(ls);
-}
-
-blkid_parttable blkid_partlist_new_parttable(blkid_partlist ls,
- const char *type, blkid_loff_t offset)
-{
- blkid_parttable tab;
-
- tab = calloc(1, sizeof(struct blkid_struct_parttable));
- if (!tab)
- return NULL;
- tab->type = type;
- tab->offset = offset;
- tab->parent = ls->next_parent;
-
- INIT_LIST_HEAD(&tab->t_tabs);
- list_add_tail(&tab->t_tabs, &ls->l_tabs);
-
- DBG(DEBUG_LOWPROBE,
- printf("parts: create a new partition table "
- "(%p, type=%s, offset=%"PRId64")\n", tab, type, offset));
- return tab;
-}
-
-static blkid_partition new_partition(blkid_partlist ls, blkid_parttable tab)
-{
- blkid_partition par;
-
- if (ls->nparts + 1 > ls->nparts_max) {
- /* Linux kernel has DISK_MAX_PARTS=256, but it's too much for
- * generic Linux machine -- let start with 32 partititions.
- */
- ls->parts = realloc(ls->parts, (ls->nparts_max + 32) *
- sizeof(struct blkid_struct_partition));
- if (!ls->parts)
- return NULL;
- ls->nparts_max += 32;
- }
-
- par = &ls->parts[ls->nparts++];
- memset(par, 0, sizeof(struct blkid_struct_partition));
-
- ref_parttable(tab);
- par->tab = tab;
- par->partno = blkid_partlist_increment_partno(ls);
-
- return par;
-}
-
-blkid_partition blkid_partlist_add_partition(blkid_partlist ls,
- blkid_parttable tab,
- blkid_loff_t start, blkid_loff_t size)
-{
- blkid_partition par = new_partition(ls, tab);
-
- if (!par)
- return NULL;
-
- par->start = start;
- par->size = size;
-
- DBG(DEBUG_LOWPROBE,
- printf("parts: add partition (%p start=%"
- PRId64 ", size=%" PRId64 ", table=%p)\n",
- par, par->start, par->size, tab));
- return par;
-}
-
-/* allows to modify used partitions numbers (for example for logical partitions) */
-int blkid_partlist_set_partno(blkid_partlist ls, int partno)
-{
- if (!ls)
- return -1;
- ls->next_partno = partno;
- return 0;
-}
-
-int blkid_partlist_increment_partno(blkid_partlist ls)
-{
- return ls ? ls->next_partno++ : -1;
-}
-
-/* allows to set "parent" for the next nested partition */
-int blkid_partlist_set_parent(blkid_partlist ls, blkid_partition par)
-{
- if (!ls)
- return -1;
- ls->next_parent = par;
- return 0;
-}
-
-blkid_partition blkid_partlist_get_parent(blkid_partlist ls)
-{
- if (!ls)
- return NULL;
- return ls->next_parent;
-}
-
-int blkid_partitions_need_typeonly(blkid_probe pr)
-{
- struct blkid_chain *chn = blkid_probe_get_chain(pr);
-
- return chn && chn->data && chn->binary ? FALSE : TRUE;
-}
-
-/* get private chain flags */
-int blkid_partitions_get_flags(blkid_probe pr)
-{
- struct blkid_chain *chn = blkid_probe_get_chain(pr);
-
- return chn ? chn->flags : 0;
-}
-
-/* check if @start and @size are within @par partition */
-int blkid_is_nested_dimension(blkid_partition par,
- blkid_loff_t start, blkid_loff_t size)
-{
- blkid_loff_t pstart;
- blkid_loff_t psize;
-
- if (!par)
- return 0;
-
- pstart = blkid_partition_get_start(par);
- psize = blkid_partition_get_size(par);
-
- if (start < pstart || start + size > pstart + psize)
- return 0;
-
- return 1;
-}
-
-static int idinfo_probe(blkid_probe pr, const struct blkid_idinfo *id,
- struct blkid_chain *chn)
-{
- const struct blkid_idmag *mag = NULL;
- blkid_loff_t off;
- int rc = 1; /* = nothing detected */
-
- if (pr->size <= 0 || (id->minsz && id->minsz > pr->size))
- goto nothing; /* the device is too small */
-
- if (blkid_probe_get_idmag(pr, id, &off, &mag))
- goto nothing;
-
- /* final check by probing function */
- if (id->probefunc) {
- DBG(DEBUG_LOWPROBE, printf(
- "%s: ---> call probefunc()\n", id->name));
- rc = id->probefunc(pr, mag);
- if (rc == -1) {
- /* reset after error */
- reset_partlist(blkid_probe_get_partlist(pr));
- if (chn && !chn->binary)
- blkid_probe_chain_reset_vals(pr, chn);
- DBG(DEBUG_LOWPROBE, printf(
- "%s probefunc failed\n", id->name));
- }
- if (rc == 0 && mag && chn && !chn->binary)
- rc = blkid_probe_set_magic(pr, off, mag->len,
- (unsigned char *) mag->magic);
-
- DBG(DEBUG_LOWPROBE, printf(
- "%s: <--- (rc = %d)\n", id->name, rc));
- }
-
-nothing:
- return rc;
-}
-
-/*
- * The blkid_do_probe() backend.
- */
-static int partitions_probe(blkid_probe pr, struct blkid_chain *chn)
-{
- int rc = 1;
- size_t i;
-
- if (!pr || chn->idx < -1)
- return -1;
- blkid_probe_chain_reset_vals(pr, chn);
-
- if (chn->binary)
- partitions_init_data(chn);
-
- if (!pr->wipe_size && (pr->prob_flags & BLKID_PROBE_FL_IGNORE_PT))
- goto details_only;
-
- DBG(DEBUG_LOWPROBE,
- printf("--> starting probing loop [PARTS idx=%d]\n",
- chn->idx));
-
- i = chn->idx < 0 ? 0 : chn->idx + 1U;
-
- for ( ; i < ARRAY_SIZE(idinfos); i++) {
- const char *name;
-
- chn->idx = i;
-
- /* apply filter */
- if (chn->fltr && blkid_bmp_get_item(chn->fltr, i))
- continue;
-
- /* apply checks from idinfo */
- if (idinfo_probe(pr, idinfos[i], chn) != 0)
- continue;
-
- name = idinfos[i]->name;
-
- /* all checks passed */
- if (!chn->binary)
- blkid_probe_set_value(pr, "PTTYPE",
- (unsigned char *) name,
- strlen(name) + 1);
- DBG(DEBUG_LOWPROBE,
- printf("<-- leaving probing loop (type=%s) [PARTS idx=%d]\n",
- name, chn->idx));
- rc = 0;
- break;
- }
-
- if (rc == 1) {
- DBG(DEBUG_LOWPROBE,
- printf("<-- leaving probing loop (failed) [PARTS idx=%d]\n",
- chn->idx));
- }
-
-details_only:
- /*
- * Gather PART_ENTRY_* values if the current device is a partition.
- */
- if (!chn->binary &&
- (blkid_partitions_get_flags(pr) & BLKID_PARTS_ENTRY_DETAILS)) {
-
- if (!blkid_partitions_probe_partition(pr))
- rc = 0;
- }
-
- return rc;
-}
-
-/* Probe for nested partition table within the parental partition */
-int blkid_partitions_do_subprobe(blkid_probe pr, blkid_partition parent,
- const struct blkid_idinfo *id)
-{
- blkid_probe prc;
- int rc = 1;
- blkid_partlist ls;
- blkid_loff_t sz, off;
-
- DBG(DEBUG_LOWPROBE, printf(
- "parts: ----> %s subprobe requested (parent=%p)\n",
- id->name, parent));
-
- if (!pr || !parent || !parent->size)
- return -1;
-
- /* range defined by parent */
- sz = ((blkid_loff_t) parent->size) << 9;
- off = ((blkid_loff_t) parent->start) << 9;
-
- if (off < pr->off || pr->off + pr->size < off + sz) {
- DBG(DEBUG_LOWPROBE, printf(
- "ERROR: parts: <---- '%s' subprobe: overflow detected.\n",
- id->name));
- return -1;
- }
-
- /* create private prober */
- prc = blkid_clone_probe(pr);
- if (!prc)
- return -1;
-
- blkid_probe_set_dimension(prc, off, sz);
-
- /* clone is always with reset chain, fix it */
- prc->cur_chain = blkid_probe_get_chain(pr);
-
- /*
- * Set 'parent' to the current list of the partitions and use the list
- * in cloned prober (so the cloned prober will extend the current list
- * of partitions rather than create a new).
- */
- ls = blkid_probe_get_partlist(pr);
- blkid_partlist_set_parent(ls, parent);
-
- blkid_probe_set_partlist(prc, ls);
-
- rc = idinfo_probe(prc, id, blkid_probe_get_chain(pr));
-
- blkid_probe_set_partlist(prc, NULL);
- blkid_partlist_set_parent(ls, NULL);
-
- blkid_free_probe(prc); /* free cloned prober */
-
- DBG(DEBUG_LOWPROBE, printf(
- "parts: <---- %s subprobe done (parent=%p, rc=%d)\n",
- id->name, parent, rc));
-
- return rc;
-}
-
-static int blkid_partitions_probe_partition(blkid_probe pr)
-{
- int rc = 1;
- blkid_probe disk_pr = NULL;
- blkid_partlist ls;
- blkid_partition par;
- dev_t devno;
-
- devno = blkid_probe_get_devno(pr);
- if (!devno)
- goto nothing;
-
- disk_pr = blkid_probe_get_wholedisk_probe(pr);
- if (!disk_pr)
- goto nothing;
-
- /* parse PT */
- ls = blkid_probe_get_partitions(disk_pr);
- if (!ls)
- goto nothing;
-
- par = blkid_partlist_devno_to_partition(ls, devno);
- if (par) {
- const char *v;
- blkid_parttable tab = blkid_partition_get_table(par);
- dev_t disk = blkid_probe_get_devno(disk_pr);
-
- if (tab) {
- v = blkid_parttable_get_type(tab);
- if (v)
- blkid_probe_set_value(pr, "PART_ENTRY_SCHEME",
- (unsigned char *) v, strlen(v) + 1);
- }
-
- v = blkid_partition_get_name(par);
- if (v)
- blkid_probe_set_value(pr, "PART_ENTRY_NAME",
- (unsigned char *) v, strlen(v) + 1);
-
- v = blkid_partition_get_uuid(par);
- if (v)
- blkid_probe_set_value(pr, "PART_ENTRY_UUID",
- (unsigned char *) v, strlen(v) + 1);
-
- /* type */
- v = blkid_partition_get_type_string(par);
- if (v)
- blkid_probe_set_value(pr, "PART_ENTRY_TYPE",
- (unsigned char *) v, strlen(v) + 1);
- else
- blkid_probe_sprintf_value(pr, "PART_ENTRY_TYPE",
- "0x%x", blkid_partition_get_type(par));
-
- if (blkid_partition_get_flags(par))
- blkid_probe_sprintf_value(pr, "PART_ENTRY_FLAGS",
- "0x%llx", blkid_partition_get_flags(par));
-
- blkid_probe_sprintf_value(pr, "PART_ENTRY_NUMBER",
- "%d", blkid_partition_get_partno(par));
-
- blkid_probe_sprintf_value(pr, "PART_ENTRY_OFFSET", "%jd",
- blkid_partition_get_start(par));
- blkid_probe_sprintf_value(pr, "PART_ENTRY_SIZE", "%jd",
- blkid_partition_get_size(par));
-
- blkid_probe_sprintf_value(pr, "PART_ENTRY_DISK", "%u:%u",
- major(disk), minor(disk));
- }
- rc = 0;
-nothing:
- return rc;
-}
-
-/*
- * Returns 1 if the device is whole-disk and the area specified by @offset and
- * @size is covered by any partition.
- */
-int blkid_probe_is_covered_by_pt(blkid_probe pr,
- blkid_loff_t offset, blkid_loff_t size)
-{
- blkid_probe prc;
- blkid_partlist ls = NULL;
- blkid_loff_t start, end;
- int nparts, i, rc = 0;
-
- DBG(DEBUG_LOWPROBE, printf(
- "=> checking if off=%jd size=%jd covered by PT\n",
- offset, size));
-
- prc = blkid_clone_probe(pr);
- if (!prc)
- goto done;
-
- ls = blkid_probe_get_partitions(prc);
- if (!ls)
- goto done;
-
- nparts = blkid_partlist_numof_partitions(ls);
- if (!nparts)
- goto done;
-
- end = (offset + size) >> 9;
- start = offset >> 9;
-
- /* check if the partition table fits into the device */
- for (i = 0; i < nparts; i++) {
- blkid_partition par = &ls->parts[i];
-
- if (par->start + par->size > (pr->size >> 9)) {
- DBG(DEBUG_LOWPROBE, printf("partition #%d overflows "
- "device (off=%" PRId64 " size=%" PRId64 ")\n",
- par->partno, par->start, par->size));
- goto done;
- }
- }
-
- /* check if the requested area is covered by PT */
- for (i = 0; i < nparts; i++) {
- blkid_partition par = &ls->parts[i];
-
- if (start >= par->start && end <= par->start + par->size) {
- rc = 1;
- break;
- }
- }
-done:
- blkid_free_probe(prc);
-
- DBG(DEBUG_LOWPROBE, printf("<= %s covered by PT\n", rc ? "IS" : "NOT"));
- return rc;
-}
-
-/**
- * blkid_known_pttype:
- * @pttype: partiton name
- *
- * Returns: 1 for known or 0 for unknown partition type.
- */
-int blkid_known_pttype(const char *pttype)
-{
- size_t i;
-
- if (!pttype)
- return 0;
-
- for (i = 0; i < ARRAY_SIZE(idinfos); i++) {
- const struct blkid_idinfo *id = idinfos[i];
- if (strcmp(id->name, pttype) == 0)
- return 1;
- }
- return 0;
-}
-
-/**
- * blkid_partlist_numof_partitions:
- * @ls: partitions list
- *
- * Returns: number of partitions in the list or -1 in case of error.
- */
-int blkid_partlist_numof_partitions(blkid_partlist ls)
-{
- return ls ? ls->nparts : -1;
-}
-
-/**
- * blkid_partlist_get_table:
- * @ls: partitions list
- *
- * Returns: top-level partition table or NULL of there is not a partition table
- * on the device.
- */
-blkid_parttable blkid_partlist_get_table(blkid_partlist ls)
-{
- if (!ls || list_empty(&ls->l_tabs))
- return NULL;
-
- return list_entry(ls->l_tabs.next,
- struct blkid_struct_parttable, t_tabs);
-}
-
-
-/**
- * blkid_partlist_get_partition:
- * @ls: partitions list
- * @n: partition number in range 0..N, where 'N' is blkid_partlist_numof_partitions().
- *
- * It's possible that the list of partitions is *empty*, but there is a valid
- * partition table on the disk. This happen when on-disk details about
- * partitions are unknown or the partition table is empty.
- *
- * See also blkid_partlist_get_table().
- *
- * Returns: partition object or NULL in case or error.
- */
-blkid_partition blkid_partlist_get_partition(blkid_partlist ls, int n)
-{
- if (!ls || n < 0 || n >= ls->nparts)
- return NULL;
-
- return &ls->parts[n];
-}
-
-/**
- * blkid_partlist_devno_to_partition:
- * @ls: partitions list
- * @devno: requested partition
- *
- * This function tries to get start and size for @devno from sysfs and
- * returns a partition from @ls which matches with the values from sysfs.
- *
- * This function is necessary when you want to make a relation between an entry
- * in the partition table (@ls) and block devices in your system.
- *
- * Returns: partition object or NULL in case or error.
- */
-blkid_partition blkid_partlist_devno_to_partition(blkid_partlist ls, dev_t devno)
-{
- struct sysfs_cxt sysfs;
- uint64_t start, size;
- int i, rc, partno = 0;
-
- if (!ls)
- return NULL;
-
- DBG(DEBUG_LOWPROBE,
- printf("triyng to convert devno 0x%llx to partition\n",
- (long long) devno));
-
- if (sysfs_init(&sysfs, devno, NULL)) {
- DBG(DEBUG_LOWPROBE, printf("failed t init sysfs context\n"));
- return NULL;
- }
- rc = sysfs_read_u64(&sysfs, "size", &size);
- if (!rc) {
- rc = sysfs_read_u64(&sysfs, "start", &start);
- if (rc) {
- /* try to get partition number from DM uuid.
- */
- char *uuid = sysfs_strdup(&sysfs, "dm/uuid");
- char *tmp = uuid;
- char *prefix = uuid ? strsep(&tmp, "-") : NULL;
-
- if (prefix && strncasecmp(prefix, "part", 4) == 0) {
- char *end = NULL;
-
- partno = strtol(prefix + 4, &end, 10);
- if (prefix == end || (end && *end))
- partno = 0;
- else
- rc = 0; /* success */
- }
- free(uuid);
- }
- }
-
- sysfs_deinit(&sysfs);
-
- if (rc)
- return NULL;
-
- if (partno) {
- DBG(DEBUG_LOWPROBE, printf("mapped by DM, using partno %d\n", partno));
-
- /*
- * Partition mapped by kpartx does not provide "start" offset
- * in /sys, but if we know partno and size of the partition
- * that we can probably make the releation bettween the device
- * and an entry in partition table.
- */
- for (i = 0; i < ls->nparts; i++) {
- blkid_partition par = &ls->parts[i];
-
- if (partno != blkid_partition_get_partno(par))
- continue;
-
- if ((blkid_loff_t) size == blkid_partition_get_size(par) ||
- (blkid_partition_is_extended(par) && size <= 1024))
- return par;
-
- }
- return NULL;
- }
-
- DBG(DEBUG_LOWPROBE, printf("searching by offset/size\n"));
-
- for (i = 0; i < ls->nparts; i++) {
- blkid_partition par = &ls->parts[i];
-
- if (blkid_partition_get_start(par) == (blkid_loff_t) start &&
- blkid_partition_get_size(par) == (blkid_loff_t) size)
- return par;
-
- /* exception for extended dos partitions */
- if (blkid_partition_get_start(par) == (blkid_loff_t) start &&
- blkid_partition_is_extended(par) && size <= 1024)
- return par;
-
- }
-
- DBG(DEBUG_LOWPROBE, printf("not found partition for device\n"));
- return NULL;
-}
-
-int blkid_parttable_set_id(blkid_parttable tab, const unsigned char *id)
-{
- if (!tab)
- return -1;
-
- if (strcmp(tab->type, "gpt") == 0)
- blkid_unparse_uuid(id, tab->id, sizeof(tab->id));
- else if (strcmp(tab->type, "dos") == 0)
- strncpy(tab->id, (const char *) id, sizeof(tab->id));
-
- return 0;
-}
-
-/**
- * blkid_parttable_get_id:
- * @tab: partition table
- *
- * The ID is GPT disk UUID or DOS disk ID (in hex format).
- *
- * Returns: partition table ID (for example GPT disk UUID) or NULL
- */
-const char *blkid_parttable_get_id(blkid_parttable tab)
-{
- return tab && tab->id && *tab->id ? tab->id : NULL;
-}
-
-
-int blkid_partition_set_type(blkid_partition par, int type)
-{
- if (!par)
- return -1;
- par->type = type;
- return 0;
-}
-
-/**
- * blkid_parttable_get_type:
- * @tab: partition table
- *
- * Returns: partition table type (type name, e.g. "dos", "gpt", ...)
- */
-const char *blkid_parttable_get_type(blkid_parttable tab)
-{
- return tab ? tab->type : NULL;
-}
-
-/**
- * blkid_parttable_get_parent:
- * @tab: partition table
- *
- * Returns: parent for nexted partitition tables or NULL.
- */
-blkid_partition blkid_parttable_get_parent(blkid_parttable tab)
-{
- return tab ? tab->parent : NULL;
-}
-
-/**
- * blkid_parttable_get_offset:
- * @tab: partition table
- *
- * Note the position is relative to begin of the device as defined by
- * blkid_probe_set_device() for primary partition table, and relative
- * to parental partition for nested patition tables.
- *
- * <informalexample>
- * <programlisting>
- * off_t offset;
- * blkid_partition parent = blkid_parttable_get_parent(tab);
- *
- * offset = blkid_parttable_get_offset(tab);
- *
- * if (parent)
- * / * 'tab' is nested partition table * /
- * offset += blkid_partition_get_start(parent);
- * </programlisting>
- * </informalexample>
-
- * Returns: position (in bytes) of the partition table or -1 in case of error.
- *
- */
-blkid_loff_t blkid_parttable_get_offset(blkid_parttable tab)
-{
- return tab ? tab->offset : -1;
-}
-
-/**
- * blkid_partition_get_table:
- * @par: partition
- *
- * The "parttable" describes partition table. The table is usually the same for
- * all partitions -- except nested partition tables.
- *
- * For example bsd, solaris, etc. use a nested partition table within
- * standard primary dos partition:
- *
- * <informalexample>
- * <programlisting>
- *
- * -- dos partition table
- * 0: sda1 dos primary partition
- * 1: sda2 dos primary partition
- * -- bsd partition table (with in sda2)
- * 2: sda5 bds partition
- * 3: sda6 bds partition
- *
- * </programlisting>
- * </informalexample>
- *
- * The library does not to use a separate partition table object for dos logical
- * partitions (partitions within extended partition). It's possible to
- * differentiate between logical, extended and primary partitions by
- *
- * blkid_partition_is_{extended,primary,logical}().
- *
- * Returns: partition table object or NULL in case of error.
- */
-blkid_parttable blkid_partition_get_table(blkid_partition par)
-{
- return par ? par->tab : NULL;
-}
-
-static int partition_get_logical_type(blkid_partition par)
-{
- blkid_parttable tab;
-
- if (!par)
- return -1;
-
- tab = blkid_partition_get_table(par);
- if (!tab || !tab->type)
- return -1;
-
- if (tab->parent)
- return 'L'; /* report nested partitions as logical */
-
- if (!strcmp(tab->type, "dos")) {
- if (par->partno > 4)
- return 'L'; /* logical */
-
- if(par->type == BLKID_DOS_EXTENDED_PARTITION ||
- par->type == BLKID_W95_EXTENDED_PARTITION ||
- par->type == BLKID_LINUX_EXTENDED_PARTITION)
- return 'E';
- }
- return 'P';
-}
-
-/**
- * blkid_partition_is_primary:
- * @par: partition
- *
- * Note, this function returns FALSE for DOS extended partitions and
- * all partitions in nested partition tables.
- *
- * Returns: 1 if the partitions is primary partition or 0 if not.
- */
-int blkid_partition_is_primary(blkid_partition par)
-{
- return partition_get_logical_type(par) == 'P' ? TRUE : FALSE;
-}
-
-/**
- * blkid_partition_is_extended:
- * @par: partition
- *
- * Returns: 1 if the partitions is extended (dos, windows or linux)
- * partition or 0 if not.
- */
-int blkid_partition_is_extended(blkid_partition par)
-{
- return partition_get_logical_type(par) == 'E' ? TRUE : FALSE;
-}
-
-/**
- * blkid_partition_is_logical:
- * @par: partition
- *
- * Note that this function returns TRUE for all partitions in all
- * nested partition tables (e.g. BSD labels).
- *
- * Returns: 1 if the partitions is logical partition or 0 if not.
- */
-int blkid_partition_is_logical(blkid_partition par)
-{
- return partition_get_logical_type(par) == 'L' ? TRUE : FALSE;
-}
-
-static void set_string(unsigned char *item, size_t max,
- const unsigned char *data, size_t len)
-{
- if (len >= max)
- len = max - 1;
-
- memcpy(item, data, len);
- item[len] = '\0';
-
- blkid_rtrim_whitespace(item);
-}
-
-int blkid_partition_set_name(blkid_partition par,
- const unsigned char *name, size_t len)
-{
- if (!par)
- return -1;
-
- set_string(par->name, sizeof(par->name), name, len);
- return 0;
-}
-
-int blkid_partition_set_utf8name(blkid_partition par, const unsigned char *name,
- size_t len, int enc)
-{
- if (!par)
- return -1;
-
- blkid_encode_to_utf8(enc, par->name, sizeof(par->name), name, len);
- blkid_rtrim_whitespace(par->name);
- return 0;
-}
-
-int blkid_partition_set_uuid(blkid_partition par, const unsigned char *uuid)
-{
- if (!par)
- return -1;
-
- blkid_unparse_uuid(uuid, par->uuid, sizeof(par->uuid));
- return 0;
-}
-
-/**
- * blkid_partition_get_name:
- * @par: partition
- *
- * Returns: partition name string if supported by PT (e.g. Mac) or NULL.
- */
-const char *blkid_partition_get_name(blkid_partition par)
-{
- return par && *par->name ? (char *) par->name : NULL;
-}
-
-/**
- * blkid_partition_get_uuid:
- * @par: partition
- *
- * Returns: partition UUID string if supported by PT (e.g. GPT) or NULL.
- */
-const char *blkid_partition_get_uuid(blkid_partition par)
-{
- return par && *par->uuid ? par->uuid : NULL;
-}
-
-/**
- * blkid_partition_get_partno:
- * @par: partition
- *
- * Returns: proposed partitin number (e.g. 'N' from sda'N') or -1 in case of
- * error. Note that the number is generate by library independenly on your OS.
- */
-int blkid_partition_get_partno(blkid_partition par)
-{
- return par ? par->partno : -1;
-}
-
-/**
- * blkid_partition_get_start:
- * @par: partition
- *
- * Be careful if you _not_ probe whole disk:
- *
- * 1) the offset is usully relative to begin of the disk -- but if you probe a
- * fragment of the disk only -- then the offset could be still relative to
- * the begin of the disk rather that relative to the fragment.
- *
- * 2) the offset for nested partitions could be releative to parent (e.g. Solaris)
- * _or_ relative to the begin of the whole disk (e.g. bsd).
- *
- * You don't have to care about such details if you proble whole disk. In such
- * a case libblkid always returns the offset relative to the begin of the disk.
- *
- * Returns: start of the partition (in 512-sectors).
- */
-blkid_loff_t blkid_partition_get_start(blkid_partition par)
-{
- return par ? par->start : -1;
-}
-
-/**
- * blkid_partition_get_size:
- * @par: partition
- *
- * WARNING: be very careful when you work with MS-DOS extended partitions. The
- * library always returns full size of the partition. If you want add
- * the partition to the Linux system (BLKPG_ADD_PARTITION ioctl) you
- * need to reduce the size of the partition to 1 or 2 blocks. The
- * rest of the partition has to be unaccessible for mkfs or mkswap
- * programs, we need a small space for boot loaders only.
- *
- * For some unknown reason this (safe) practice is not to used for
- * nested BSD, Solaris, ..., partition tables in Linux kernel.
- *
- * Returns: size of the partition (in 512-sectors).
- */
-blkid_loff_t blkid_partition_get_size(blkid_partition par)
-{
- return par ? par->size : -1;
-}
-
-/**
- * blkid_partition_get_type:
- * @par: partition
- *
- * Returns: partition type.
- */
-int blkid_partition_get_type(blkid_partition par)
-{
- return par->type;
-}
-
-/* Sets partition 'type' for PT where the type is defined by string rather
- * than by number
- */
-int blkid_partition_set_type_string(blkid_partition par,
- const unsigned char *type, size_t len)
-{
- if (!par)
- return -1;
-
- set_string((unsigned char *) par->typestr,
- sizeof(par->typestr), type, len);
- return 0;
-}
-
-/* Sets partition 'type' for PT where the type is defined by UUIDrather
- * than by number
- */
-int blkid_partition_set_type_uuid(blkid_partition par, const unsigned char *uuid)
-{
- if (!par)
- return -1;
-
- blkid_unparse_uuid(uuid, par->typestr, sizeof(par->typestr));
- return 0;
-}
-
-/**
- * blkid_partition_get_type_string:
- * @par: partition
- *
- * The type string is supported by a small subset of partition tables (e.g Mac
- * and EFI GPT). Note that GPT uses type UUID and this function returns this
- * UUID as string.
- *
- * Returns: partition type string or NULL.
- */
-const char *blkid_partition_get_type_string(blkid_partition par)
-{
- return par && *par->typestr ? par->typestr : NULL;
-}
-
-
-int blkid_partition_set_flags(blkid_partition par, unsigned long long flags)
-{
- if (!par)
- return -1;
- par->flags = flags;
- return 0;
-}
-
-/**
- * blkid_partition_get_flags
- * @par: partition
- *
- * Returns: partition flags (or attributes for gpt).
- */
-unsigned long long blkid_partition_get_flags(blkid_partition par)
-{
- return par->flags;
-}
-
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-15 06:07:56 +0200