mirror of
git://sourceware.org/git/lvm2.git
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491 lines
11 KiB
C
491 lines
11 KiB
C
/*
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* Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
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* Copyright (C) 2004-2012 Red Hat, Inc. All rights reserved.
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*
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* This file is part of LVM2.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU Lesser General Public License v.2.1.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "lib/misc/lib.h"
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#include "lib/device/device.h"
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#include "lib/metadata/metadata.h"
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#include "lib/mm/memlock.h"
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#include <limits.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/ioctl.h>
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#ifdef __linux__
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# define u64 uint64_t /* Missing without __KERNEL__ */
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# undef WNOHANG /* Avoid redefinition */
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# undef WUNTRACED /* Avoid redefinition */
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# include <linux/fs.h> /* For block ioctl definitions */
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# define BLKSIZE_SHIFT SECTOR_SHIFT
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# ifndef BLKGETSIZE64 /* fs.h out-of-date */
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# define BLKGETSIZE64 _IOR(0x12, 114, size_t)
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# endif /* BLKGETSIZE64 */
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# ifndef BLKDISCARD
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# define BLKDISCARD _IO(0x12,119)
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# endif
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#else
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# include <sys/disk.h>
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# define BLKBSZGET DKIOCGETBLOCKSIZE
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# define BLKSSZGET DKIOCGETBLOCKSIZE
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# define BLKGETSIZE64 DKIOCGETBLOCKCOUNT
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# define BLKFLSBUF DKIOCSYNCHRONIZECACHE
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# define BLKSIZE_SHIFT 0
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#endif
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#ifdef O_DIRECT_SUPPORT
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# ifndef O_DIRECT
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# error O_DIRECT support configured but O_DIRECT definition not found in headers
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# endif
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#endif
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static unsigned _dev_size_seqno = 1;
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static int _dev_get_size_file(struct device *dev, uint64_t *size)
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{
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const char *name = dev_name(dev);
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struct stat info;
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if (dev->size_seqno == _dev_size_seqno) {
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log_very_verbose("%s: using cached size %" PRIu64 " sectors",
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name, dev->size);
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*size = dev->size;
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return 1;
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}
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if (stat(name, &info)) {
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log_sys_error("stat", name);
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return 0;
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}
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*size = info.st_size;
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*size >>= SECTOR_SHIFT; /* Convert to sectors */
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dev->size = *size;
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dev->size_seqno = _dev_size_seqno;
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log_very_verbose("%s: size is %" PRIu64 " sectors", name, *size);
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return 1;
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}
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static int _dev_get_size_dev(struct device *dev, uint64_t *size)
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{
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const char *name = dev_name(dev);
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int fd = dev->bcache_fd;
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int do_close = 0;
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if (dm_list_empty(&dev->aliases))
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return 0;
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if (dev->size_seqno == _dev_size_seqno) {
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log_very_verbose("%s: using cached size %" PRIu64 " sectors",
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name, dev->size);
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*size = dev->size;
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return 1;
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}
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if (fd <= 0) {
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if (!dev_open_readonly_quiet(dev))
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return_0;
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fd = dev_fd(dev);
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do_close = 1;
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}
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if (ioctl(fd, BLKGETSIZE64, size) < 0) {
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log_sys_error("ioctl BLKGETSIZE64", name);
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if (do_close && !dev_close_immediate(dev))
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stack;
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return 0;
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}
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*size >>= BLKSIZE_SHIFT; /* Convert to sectors */
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dev->size = *size;
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dev->size_seqno = _dev_size_seqno;
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log_very_verbose("%s: size is %" PRIu64 " sectors", name, *size);
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if (do_close && !dev_close_immediate(dev))
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stack;
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return 1;
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}
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static int _dev_read_ahead_dev(struct device *dev, uint32_t *read_ahead)
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{
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long read_ahead_long;
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if (dev->read_ahead != -1) {
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*read_ahead = (uint32_t) dev->read_ahead;
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return 1;
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}
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if (!dev_open_readonly_quiet(dev)) {
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log_error("Failed to open to get readahead %s", dev_name(dev));
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return 0;
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}
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if (ioctl(dev->fd, BLKRAGET, &read_ahead_long) < 0) {
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log_sys_error("ioctl BLKRAGET", dev_name(dev));
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if (!dev_close_immediate(dev))
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stack;
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return 0;
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}
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*read_ahead = (uint32_t) read_ahead_long;
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dev->read_ahead = read_ahead_long;
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log_very_verbose("%s: read_ahead is %u sectors",
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dev_name(dev), *read_ahead);
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if (!dev_close_immediate(dev))
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stack;
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return 1;
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}
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static int _dev_discard_blocks(struct device *dev, uint64_t offset_bytes, uint64_t size_bytes)
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{
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uint64_t discard_range[2];
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if (!dev_open(dev))
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return_0;
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discard_range[0] = offset_bytes;
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discard_range[1] = size_bytes;
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log_debug_devs("Discarding %" PRIu64 " bytes offset %" PRIu64 " bytes on %s. %s",
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size_bytes, offset_bytes, dev_name(dev),
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test_mode() ? " (test mode - suppressed)" : "");
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if (!test_mode() && ioctl(dev->fd, BLKDISCARD, &discard_range) < 0) {
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log_error("%s: BLKDISCARD ioctl at offset %" PRIu64 " size %" PRIu64 " failed: %s.",
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dev_name(dev), offset_bytes, size_bytes, strerror(errno));
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if (!dev_close_immediate(dev))
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stack;
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/* It doesn't matter if discard failed, so return success. */
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return 1;
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}
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if (!dev_close_immediate(dev))
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stack;
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return 1;
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}
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int dev_get_direct_block_sizes(struct device *dev, unsigned int *physical_block_size,
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unsigned int *logical_block_size)
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{
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int fd = dev->bcache_fd;
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int do_close = 0;
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unsigned int pbs = 0;
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unsigned int lbs = 0;
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if (dev->physical_block_size || dev->logical_block_size) {
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*physical_block_size = dev->physical_block_size;
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*logical_block_size = dev->logical_block_size;
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return 1;
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}
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if (fd <= 0) {
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if (!dev_open_readonly_quiet(dev))
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return 0;
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fd = dev_fd(dev);
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do_close = 1;
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}
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#ifdef BLKPBSZGET /* not defined before kernel version 2.6.32 (e.g. rhel5) */
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/*
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* BLKPBSZGET from kernel comment for blk_queue_physical_block_size:
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* "the lowest possible sector size that the hardware can operate on
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* without reverting to read-modify-write operations"
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*/
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if (ioctl(fd, BLKPBSZGET, &pbs)) {
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stack;
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pbs = 0;
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}
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#endif
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/*
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* BLKSSZGET from kernel comment for blk_queue_logical_block_size:
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* "the lowest possible block size that the storage device can address."
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*/
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if (ioctl(fd, BLKSSZGET, &lbs)) {
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stack;
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lbs = 0;
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}
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dev->physical_block_size = pbs;
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dev->logical_block_size = lbs;
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*physical_block_size = pbs;
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*logical_block_size = lbs;
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if (do_close && !dev_close_immediate(dev))
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stack;
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return 1;
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}
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/*-----------------------------------------------------------------
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* Public functions
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*---------------------------------------------------------------*/
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void dev_size_seqno_inc(void)
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{
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_dev_size_seqno++;
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}
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int dev_get_size(struct device *dev, uint64_t *size)
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{
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if (!dev)
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return 0;
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if ((dev->flags & DEV_REGULAR))
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return _dev_get_size_file(dev, size);
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return _dev_get_size_dev(dev, size);
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}
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int dev_get_read_ahead(struct device *dev, uint32_t *read_ahead)
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{
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if (!dev)
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return 0;
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if (dev->flags & DEV_REGULAR) {
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*read_ahead = 0;
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return 1;
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}
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return _dev_read_ahead_dev(dev, read_ahead);
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}
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int dev_discard_blocks(struct device *dev, uint64_t offset_bytes, uint64_t size_bytes)
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{
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if (!dev)
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return 0;
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if (dev->flags & DEV_REGULAR)
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return 1;
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return _dev_discard_blocks(dev, offset_bytes, size_bytes);
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}
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void dev_flush(struct device *dev)
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{
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if (!(dev->flags & DEV_REGULAR) && ioctl(dev->fd, BLKFLSBUF, 0) >= 0)
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return;
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if (fsync(dev->fd) >= 0)
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return;
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sync();
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}
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int dev_open_flags(struct device *dev, int flags, int direct, int quiet)
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{
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struct stat buf;
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const char *name;
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int need_excl = 0, need_rw = 0;
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if ((flags & O_ACCMODE) == O_RDWR)
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need_rw = 1;
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if ((flags & O_EXCL))
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need_excl = 1;
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if (dev->fd >= 0) {
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if (((dev->flags & DEV_OPENED_RW) || !need_rw) &&
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((dev->flags & DEV_OPENED_EXCL) || !need_excl)) {
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dev->open_count++;
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return 1;
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}
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if (dev->open_count && !need_excl)
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log_debug_devs("%s: Already opened read-only. Upgrading "
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"to read-write.", dev_name(dev));
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/* dev_close_immediate will decrement this */
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dev->open_count++;
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if (!dev_close_immediate(dev))
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return_0;
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// FIXME: dev with DEV_ALLOCED is released
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// but code is referencing it
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}
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if (critical_section())
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/* FIXME Make this log_error */
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log_verbose("dev_open(%s) called while suspended",
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dev_name(dev));
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if (!(name = dev_name_confirmed(dev, quiet)))
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return_0;
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#ifdef O_DIRECT_SUPPORT
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if (direct) {
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if (!(dev->flags & DEV_O_DIRECT_TESTED))
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dev->flags |= DEV_O_DIRECT;
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if ((dev->flags & DEV_O_DIRECT))
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flags |= O_DIRECT;
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}
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#endif
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#ifdef O_NOATIME
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/* Don't update atime on device inodes */
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if (!(dev->flags & DEV_REGULAR) && !(dev->flags & DEV_NOT_O_NOATIME))
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flags |= O_NOATIME;
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#endif
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if ((dev->fd = open(name, flags, 0777)) < 0) {
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#ifdef O_NOATIME
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if ((errno == EPERM) && (flags & O_NOATIME)) {
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flags &= ~O_NOATIME;
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dev->flags |= DEV_NOT_O_NOATIME;
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if ((dev->fd = open(name, flags, 0777)) >= 0) {
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log_debug_devs("%s: Not using O_NOATIME", name);
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goto opened;
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}
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}
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#endif
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#ifdef O_DIRECT_SUPPORT
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if (direct && !(dev->flags & DEV_O_DIRECT_TESTED)) {
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flags &= ~O_DIRECT;
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if ((dev->fd = open(name, flags, 0777)) >= 0) {
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dev->flags &= ~DEV_O_DIRECT;
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log_debug_devs("%s: Not using O_DIRECT", name);
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goto opened;
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}
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}
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#endif
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if (quiet)
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log_sys_debug("open", name);
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else
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log_sys_error("open", name);
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dev->flags |= DEV_OPEN_FAILURE;
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return 0;
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}
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#ifdef O_DIRECT_SUPPORT
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opened:
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if (direct)
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dev->flags |= DEV_O_DIRECT_TESTED;
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#endif
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dev->open_count++;
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if (need_rw)
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dev->flags |= DEV_OPENED_RW;
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else
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dev->flags &= ~DEV_OPENED_RW;
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if (need_excl)
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dev->flags |= DEV_OPENED_EXCL;
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else
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dev->flags &= ~DEV_OPENED_EXCL;
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if (!(dev->flags & DEV_REGULAR) &&
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((fstat(dev->fd, &buf) < 0) || (buf.st_rdev != dev->dev))) {
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log_error("%s: fstat failed: Has device name changed?", name);
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if (!dev_close_immediate(dev))
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stack;
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return 0;
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}
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#ifndef O_DIRECT_SUPPORT
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if (!(dev->flags & DEV_REGULAR))
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dev_flush(dev);
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#endif
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if ((flags & O_CREAT) && !(flags & O_TRUNC))
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dev->end = lseek(dev->fd, (off_t) 0, SEEK_END);
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log_debug_devs("Opened %s %s%s%s", dev_name(dev),
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dev->flags & DEV_OPENED_RW ? "RW" : "RO",
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dev->flags & DEV_OPENED_EXCL ? " O_EXCL" : "",
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dev->flags & DEV_O_DIRECT ? " O_DIRECT" : "");
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dev->flags &= ~DEV_OPEN_FAILURE;
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return 1;
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}
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int dev_open_quiet(struct device *dev)
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{
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return dev_open_flags(dev, O_RDWR, 1, 1);
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}
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int dev_open(struct device *dev)
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{
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return dev_open_flags(dev, O_RDWR, 1, 0);
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}
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int dev_open_readonly(struct device *dev)
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{
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return dev_open_flags(dev, O_RDONLY, 1, 0);
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}
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int dev_open_readonly_buffered(struct device *dev)
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{
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return dev_open_flags(dev, O_RDONLY, 0, 0);
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}
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int dev_open_readonly_quiet(struct device *dev)
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{
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return dev_open_flags(dev, O_RDONLY, 1, 1);
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}
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static void _close(struct device *dev)
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{
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if (close(dev->fd))
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log_sys_debug("close", dev_name(dev));
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dev->fd = -1;
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log_debug_devs("Closed %s", dev_name(dev));
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if (dev->flags & DEV_ALLOCED)
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dev_destroy_file(dev);
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}
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static int _dev_close(struct device *dev, int immediate)
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{
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if (dev->fd < 0) {
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log_error("Attempt to close device '%s' "
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"which is not open.", dev_name(dev));
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return 0;
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}
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if (dev->open_count > 0)
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dev->open_count--;
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if (immediate && dev->open_count)
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log_debug_devs("%s: Immediate close attempt while still referenced",
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dev_name(dev));
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if (immediate || (dev->open_count < 1))
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_close(dev);
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return 1;
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}
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int dev_close(struct device *dev)
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{
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return _dev_close(dev, 0);
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}
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int dev_close_immediate(struct device *dev)
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{
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return _dev_close(dev, 1);
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}
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