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-rw-r--r--libblkid/topology.c366
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diff --git a/libblkid/topology.c b/libblkid/topology.c
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-/*
- * topology - gathers information about device topology
- *
- * Copyright 2009 Red Hat, Inc. All rights reserved.
- *
- * 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 <stddef.h>
-
-#include "topology.h"
-
-/**
- * SECTION:topology
- * @title: Topology information
- * @short_description: block device topology information.
- *
- * The topology chain provides details about Linux block devices, for more
- * information see:
- *
- * Linux kernel Documentation/ABI/testing/sysfs-block
- *
- * NAME=value (tags) interface is enabled by blkid_probe_enable_topology(),
- * and provides:
- *
- * @LOGICAL_SECTOR_SIZE: this is the smallest unit the storage device can
- * address. It is typically 512 bytes.
- *
- * @PHYSICAL_SECTOR_SIZE: this is the smallest unit a physical storage device
- * can write atomically. It is usually the same as the
- * logical sector size but may be bigger.
- *
- * @MINIMUM_IO_SIZE: minimum size which is the device's preferred unit of I/O.
- * For RAID arrays it is often the stripe chunk size.
- *
- * @OPTIMAL_IO_SIZE: usually the stripe width for RAID or zero. For RAID arrays
- * it is usually the stripe width or the internal track size.
- *
- * @ALIGNMENT_OFFSET: indicates how many bytes the beginning of the device is
- * offset from the disk's natural alignment.
- *
- * The NAME=value tags are not defined when the corresponding topology value
- * is zero. The MINIMUM_IO_SIZE should be always defined if kernel provides
- * topology information.
- *
- * Binary interface:
- *
- * blkid_probe_get_topology()
- *
- * blkid_topology_get_'VALUENAME'()
- */
-static int topology_probe(blkid_probe pr, struct blkid_chain *chn);
-static void topology_free(blkid_probe pr, void *data);
-static int topology_is_complete(blkid_probe pr);
-static int topology_set_logical_sector_size(blkid_probe pr);
-
-/*
- * Binary interface
- */
-struct blkid_struct_topology {
- unsigned long alignment_offset;
- unsigned long minimum_io_size;
- unsigned long optimal_io_size;
- unsigned long logical_sector_size;
- unsigned long physical_sector_size;
-};
-
-/*
- * Topology chain probing functions
- */
-static const struct blkid_idinfo *idinfos[] =
-{
-#ifdef __linux__
- &ioctl_tp_idinfo,
- &sysfs_tp_idinfo,
- &md_tp_idinfo,
- &dm_tp_idinfo,
- &lvm_tp_idinfo,
- &evms_tp_idinfo
-#endif
-};
-
-
-/*
- * Driver definition
- */
-const struct blkid_chaindrv topology_drv = {
- .id = BLKID_CHAIN_TOPLGY,
- .name = "topology",
- .dflt_enabled = FALSE,
- .idinfos = idinfos,
- .nidinfos = ARRAY_SIZE(idinfos),
- .probe = topology_probe,
- .safeprobe = topology_probe,
- .free_data = topology_free
-};
-
-/**
- * blkid_probe_enable_topology:
- * @pr: probe
- * @enable: TRUE/FALSE
- *
- * Enables/disables the topology probing for non-binary interface.
- *
- * Returns: 0 on success, or -1 in case of error.
- */
-int blkid_probe_enable_topology(blkid_probe pr, int enable)
-{
- if (!pr)
- return -1;
- pr->chains[BLKID_CHAIN_TOPLGY].enabled = enable;
- return 0;
-}
-
-/**
- * blkid_probe_get_topology:
- * @pr: probe
- *
- * This is a binary interface for topology values. See also blkid_topology_*
- * functions.
- *
- * This function is independent on blkid_do_[safe,full]probe() and
- * blkid_probe_enable_topology() calls.
- *
- * WARNING: the returned object will be overwritten by the next
- * blkid_probe_get_topology() call for the same @pr. If you want to
- * use more blkid_topopogy objects in the same time you have to create
- * more blkid_probe handlers (see blkid_new_probe()).
- *
- * Returns: blkid_topopogy, or NULL in case of error.
- */
-blkid_topology blkid_probe_get_topology(blkid_probe pr)
-{
- return (blkid_topology) blkid_probe_get_binary_data(pr,
- &pr->chains[BLKID_CHAIN_TOPLGY]);
-}
-
-/*
- * The blkid_do_probe() backend.
- */
-static int topology_probe(blkid_probe pr, struct blkid_chain *chn)
-{
- size_t i;
-
- if (!pr || chn->idx < -1)
- return -1;
-
- if (!S_ISBLK(pr->mode))
- return -1; /* nothing, works with block devices only */
-
- if (chn->binary) {
- DBG(DEBUG_LOWPROBE, printf("initialize topology binary data\n"));
-
- if (chn->data)
- /* reset binary data */
- memset(chn->data, 0,
- sizeof(struct blkid_struct_topology));
- else {
- chn->data = calloc(1,
- sizeof(struct blkid_struct_topology));
- if (!chn->data)
- return -1;
- }
- }
-
- blkid_probe_chain_reset_vals(pr, chn);
-
- DBG(DEBUG_LOWPROBE,
- printf("--> starting probing loop [TOPOLOGY idx=%d]\n",
- chn->idx));
-
- i = chn->idx < 0 ? 0 : chn->idx + 1U;
-
- for ( ; i < ARRAY_SIZE(idinfos); i++) {
- const struct blkid_idinfo *id = idinfos[i];
-
- chn->idx = i;
-
- if (id->probefunc) {
- DBG(DEBUG_LOWPROBE, printf(
- "%s: call probefunc()\n", id->name));
- if (id->probefunc(pr, NULL) != 0)
- continue;
- }
-
- if (!topology_is_complete(pr))
- continue;
-
- /* generic for all probing drivers */
- topology_set_logical_sector_size(pr);
-
- DBG(DEBUG_LOWPROBE,
- printf("<-- leaving probing loop (type=%s) [TOPOLOGY idx=%d]\n",
- id->name, chn->idx));
- return 0;
- }
-
- DBG(DEBUG_LOWPROBE,
- printf("<-- leaving probing loop (failed) [TOPOLOGY idx=%d]\n",
- chn->idx));
- return 1;
-}
-
-static void topology_free(blkid_probe pr __attribute__((__unused__)),
- void *data)
-{
- free(data);
-}
-
-static int topology_set_value(blkid_probe pr, const char *name,
- size_t structoff, unsigned long data)
-{
- struct blkid_chain *chn = blkid_probe_get_chain(pr);
-
- if (!chn)
- return -1;
- if (!data)
- return 0; /* ignore zeros */
-
- if (chn->binary) {
- memcpy(chn->data + structoff, &data, sizeof(data));
- return 0;
- }
- return blkid_probe_sprintf_value(pr, name, "%lu", data);
-}
-
-
-/* the topology info is complete when we have at least "minimum_io_size" which
- * is provided by all blkid topology drivers */
-static int topology_is_complete(blkid_probe pr)
-{
- struct blkid_chain *chn = blkid_probe_get_chain(pr);
-
- if (!chn)
- return FALSE;
-
- if (chn->binary && chn->data) {
- blkid_topology tp = (blkid_topology) chn->data;
- if (tp->minimum_io_size)
- return TRUE;
- }
-
- return __blkid_probe_lookup_value(pr, "MINIMUM_IO_SIZE") ? TRUE : FALSE;
-}
-
-int blkid_topology_set_alignment_offset(blkid_probe pr, int val)
-{
- unsigned long xval;
-
- /* Welcome to Hell. The kernel is able to return -1 as an
- * alignment_offset if no compatible sizes and alignments
- * exist for stacked devices.
- *
- * There is no way how libblkid caller can respond to the value -1, so
- * we will hide this corner case...
- *
- * (TODO: maybe we can export an extra boolean value 'misaligned' rather
- * then complete hide this problem.)
- */
- xval = val < 0 ? 0 : val;
-
- return topology_set_value(pr,
- "ALIGNMENT_OFFSET",
- offsetof(struct blkid_struct_topology, alignment_offset),
- xval);
-}
-
-int blkid_topology_set_minimum_io_size(blkid_probe pr, unsigned long val)
-{
- return topology_set_value(pr,
- "MINIMUM_IO_SIZE",
- offsetof(struct blkid_struct_topology, minimum_io_size),
- val);
-}
-
-int blkid_topology_set_optimal_io_size(blkid_probe pr, unsigned long val)
-{
- return topology_set_value(pr,
- "OPTIMAL_IO_SIZE",
- offsetof(struct blkid_struct_topology, optimal_io_size),
- val);
-}
-
-/* BLKSSZGET is provided on all systems since 2.3.3 -- so we don't have to
- * waste time with sysfs.
- */
-static int topology_set_logical_sector_size(blkid_probe pr)
-{
- unsigned long val = blkid_probe_get_sectorsize(pr);
-
- if (!val)
- return -1;
-
- return topology_set_value(pr,
- "LOGICAL_SECTOR_SIZE",
- offsetof(struct blkid_struct_topology, logical_sector_size),
- val);
-}
-
-int blkid_topology_set_physical_sector_size(blkid_probe pr, unsigned long val)
-{
- return topology_set_value(pr,
- "PHYSICAL_SECTOR_SIZE",
- offsetof(struct blkid_struct_topology, physical_sector_size),
- val);
-}
-
-/**
- * blkid_topology_get_alignment_offset:
- * @tp: topology
- *
- * Returns: alignment offset in bytes or 0.
- */
-unsigned long blkid_topology_get_alignment_offset(blkid_topology tp)
-{
- return tp->alignment_offset;
-}
-
-/**
- * blkid_topology_get_minimum_io_size:
- * @tp: topology
- *
- * Returns: minimum io size in bytes or 0.
- */
-unsigned long blkid_topology_get_minimum_io_size(blkid_topology tp)
-{
- return tp->minimum_io_size;
-}
-
-/**
- * blkid_topology_get_optimal_io_size
- * @tp: topology
- *
- * Returns: optimal io size in bytes or 0.
- */
-unsigned long blkid_topology_get_optimal_io_size(blkid_topology tp)
-{
- return tp->optimal_io_size;
-}
-
-/**
- * blkid_topology_get_logical_sector_size
- * @tp: topology
- *
- * Returns: logical sector size (BLKSSZGET ioctl) in bytes or 0.
- */
-unsigned long blkid_topology_get_logical_sector_size(blkid_topology tp)
-{
- return tp->logical_sector_size;
-}
-
-/**
- * blkid_topology_get_physical_sector_size
- * @tp: topology
- *
- * Returns: logical sector size (BLKSSZGET ioctl) in bytes or 0.
- */
-unsigned long blkid_topology_get_physical_sector_size(blkid_topology tp)
-{
- return tp->physical_sector_size;
-}
-
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