4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21 * CA 95054 USA or visit www.sun.com if you need additional information or
27 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
30 * Copyright (c) 2011, Whamcloud, Inc.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
36 * lustre/utils/mount_utils_ldiskfs.c
38 * Author: Nathan Rutman <nathan@clusterfs.com>
41 /* This source file is compiled into both mkfs.lustre and tunefs.lustre */
45 #endif /* HAVE_CONFIG_H */
58 #include <sys/types.h>
60 #include <sys/mount.h>
61 #include <sys/utsname.h>
69 /* libcfs.h is not really needed here, but on SLES10/PPC, fs.h includes idr.h
70 * which requires BITS_PER_LONG to be defined */
71 #include <libcfs/libcfs.h>
73 #include <linux/fs.h> /* for BLKGETSIZE64 */
75 #include <linux/version.h>
77 #include <lustre_disk.h>
78 #include <lustre_param.h>
79 #include <lnet/lnetctl.h>
80 #include <lustre_ver.h>
81 #include "mount_utils.h"
83 #define MAX_HW_SECTORS_KB_PATH "queue/max_hw_sectors_kb"
84 #define MAX_SECTORS_KB_PATH "queue/max_sectors_kb"
85 #define STRIPE_CACHE_SIZE "md/stripe_cache_size"
87 extern char *progname;
89 #define L_BLOCK_SIZE 4096
90 /* keep it less than LL_FID_NAMELEN */
91 #define DUMMY_FILE_NAME_LEN 25
92 #define EXT3_DIRENT_SIZE DUMMY_FILE_NAME_LEN
94 /* Write the server config files */
95 int ldiskfs_write_ldd(struct mkfs_opts *mop)
97 char mntpt[] = "/tmp/mntXXXXXX";
104 /* Mount this device temporarily in order to write these files */
105 if (!mkdtemp(mntpt)) {
106 fprintf(stderr, "%s: Can't create temp mount point %s: %s\n",
107 progname, mntpt, strerror(errno));
111 dev = mop->mo_device;
112 if (mop->mo_flags & MO_IS_LOOP)
113 dev = mop->mo_loopdev;
115 ret = mount(dev, mntpt, MT_STR(&mop->mo_ldd), 0,
116 mop->mo_ldd.ldd_mount_opts);
118 fprintf(stderr, "%s: Unable to mount %s: %s\n",
119 progname, dev, strerror(errno));
121 if (errno == ENODEV) {
122 fprintf(stderr, "Is the %s module available?\n",
123 MT_STR(&mop->mo_ldd));
128 /* Set up initial directories */
129 sprintf(filepnm, "%s/%s", mntpt, MOUNT_CONFIGS_DIR);
130 ret = mkdir(filepnm, 0777);
131 if ((ret != 0) && (errno != EEXIST)) {
132 fprintf(stderr, "%s: Can't make configs dir %s (%s)\n",
133 progname, filepnm, strerror(errno));
135 } else if (errno == EEXIST) {
139 /* Save the persistent mount data into a file. Lustre must pre-read
140 this file to get the real mount options. */
141 vprint("Writing %s\n", MOUNT_DATA_FILE);
142 sprintf(filepnm, "%s/%s", mntpt, MOUNT_DATA_FILE);
143 filep = fopen(filepnm, "w");
145 fprintf(stderr, "%s: Unable to create %s file: %s\n",
146 progname, filepnm, strerror(errno));
149 num = fwrite(&mop->mo_ldd, sizeof(mop->mo_ldd), 1, filep);
150 if (num < 1 && ferror(filep)) {
151 fprintf(stderr, "%s: Unable to write to file (%s): %s\n",
152 progname, filepnm, strerror(errno));
164 static int readcmd(char *cmd, char *buf, int len)
169 fp = popen(cmd, "r");
173 red = fread(buf, 1, len, fp);
176 /* strip trailing newline */
177 if (buf[red - 1] == '\n')
180 return (red == 0) ? -ENOENT : 0;
183 int ldiskfs_read_ldd(char *dev, struct lustre_disk_data *mo_ldd)
185 char tmpdir[] = "/tmp/dirXXXXXX";
190 int cmdsz = sizeof(cmd);
192 /* Make a temporary directory to hold Lustre data files. */
193 if (!mkdtemp(tmpdir)) {
194 fprintf(stderr, "%s: Can't create temporary directory %s: %s\n",
195 progname, tmpdir, strerror(errno));
199 /* TODO: it's worth observing the get_mountdata() function that is
200 in mount_utils.c for getting the mountdata out of the
203 /* Construct debugfs command line. */
204 snprintf(cmd, cmdsz, "%s -c -R 'dump /%s %s/mountdata' '%s'",
205 DEBUGFS, MOUNT_DATA_FILE, tmpdir, dev);
207 ret = run_command(cmd, cmdsz);
209 verrprint("%s: Unable to dump %s dir (%d)\n",
210 progname, MOUNT_CONFIGS_DIR, ret);
212 sprintf(filepnm, "%s/mountdata", tmpdir);
213 filep = fopen(filepnm, "r");
216 vprint("Reading %s\n", MOUNT_DATA_FILE);
217 num_read = fread(mo_ldd, sizeof(*mo_ldd), 1, filep);
218 if (num_read < 1 && ferror(filep)) {
219 fprintf(stderr, "%s: Unable to read from file %s: %s\n",
220 progname, filepnm, strerror(errno));
227 snprintf(cmd, cmdsz, "rm -rf %s", tmpdir);
228 run_command(cmd, cmdsz);
230 verrprint("Failed to read old data (%d)\n", ret);
232 /* As long as we at least have the label, we're good to go */
233 snprintf(cmd, sizeof(cmd), E2LABEL" %s", dev);
234 ret = readcmd(cmd, mo_ldd->ldd_svname, sizeof(mo_ldd->ldd_svname) - 1);
240 /* Display the need for the latest e2fsprogs to be installed. make_backfs
241 * indicates if the caller is make_lustre_backfs() or not. */
242 void disp_old_e2fsprogs_msg(const char *feature, int make_backfs)
244 static int msg_displayed;
247 fprintf(stderr, "WARNING: %s does not support %s "
248 "feature.\n\n", E2FSPROGS, feature);
254 fprintf(stderr, "WARNING: The %s package currently installed on "
255 "your system does not support \"%s\" feature.\n",
257 #if !(HAVE_LDISKFSPROGS)
258 fprintf(stderr, "Please install the latest version of e2fsprogs from\n"
259 "http://downloads.whamcloud.com/public/e2fsprogs/latest/\n"
260 "to enable this feature.\n");
263 fprintf(stderr, "Feature will not be enabled until %s"
264 "is updated and '%s -O %s %%{device}' "
265 "is run.\n\n", E2FSPROGS, TUNE2FS, feature);
268 /* Check whether the file exists in the device */
269 static int file_in_dev(char *file_name, char *dev_name)
272 char debugfs_cmd[256];
273 unsigned int inode_num;
276 /* Construct debugfs command line. */
277 snprintf(debugfs_cmd, sizeof(debugfs_cmd),
278 "%s -c -R 'stat %s' '%s' 2>&1 | egrep '(Inode|unsupported)'",
279 DEBUGFS, file_name, dev_name);
281 fp = popen(debugfs_cmd, "r");
283 fprintf(stderr, "%s: %s\n", progname, strerror(errno));
287 if (fscanf(fp, "Inode: %u", &inode_num) == 1) { /* exist */
291 i = fread(debugfs_cmd, 1, sizeof(debugfs_cmd), fp);
294 fprintf(stderr, "%s", debugfs_cmd);
295 if (strstr(debugfs_cmd, "unsupported feature")) {
296 disp_old_e2fsprogs_msg("an unknown", 0);
305 /* Check whether the device has already been used with lustre */
306 int ldiskfs_is_lustre(char *dev, unsigned *mount_type)
310 ret = file_in_dev(MOUNT_DATA_FILE, dev);
312 /* in the -1 case, 'extents' means IS a lustre target */
313 *mount_type = LDD_MT_LDISKFS;
317 ret = file_in_dev(LAST_RCVD, dev);
319 *mount_type = LDD_MT_LDISKFS;
326 /* Check if a certain feature is supported by e2fsprogs.
327 * Firstly we try to use "debugfs supported_features" command to check if
328 * the feature is supported. If this fails we try to set this feature with
329 * mke2fs to check for its support. */
330 static int is_e2fsprogs_feature_supp(const char *feature)
332 static char supp_features[4096] = "";
335 char imgname[] = "/tmp/test-img-XXXXXX";
339 if (supp_features[0] == '\0') {
340 snprintf(cmd, sizeof(cmd), "%s -c -R supported_features 2>&1",
343 /* Using popen() instead of run_command() since debugfs does
344 * not return proper error code if command is not supported */
345 fp = popen(cmd, "r");
347 fprintf(stderr, "%s: %s\n", progname, strerror(errno));
350 ret = fread(supp_features, 1, sizeof(supp_features), fp);
353 if (ret > 0 && strstr(supp_features,
354 strncmp(feature, "-O ", 3) ? feature : feature+3))
357 if ((fd = mkstemp(imgname)) < 0)
362 snprintf(cmd, sizeof(cmd), "%s -F %s %s 100 >/dev/null 2>&1",
363 MKE2FS, feature, imgname);
364 /* run_command() displays the output of mke2fs when it fails for
365 * some feature, so use system() directly */
374 * append_unique: append @key or @key=@val pair to @buf only if @key does not
376 * @buf: buffer to hold @key or @key=@val
377 * @prefix: prefix string before @key
379 * @val: value string if it's a @key=@val pair
381 static void append_unique(char *buf, char *prefix, char *key, char *val,
390 anchor = end = strstr(buf, key);
391 /* try to find exact match string in @buf */
392 while (end && *end != '\0' && *end != ',' && *end != ' ' && *end != '=')
395 if (anchor == NULL || strlen(key) != len ||
396 strncmp(anchor, key, len) != 0) {
398 strscat(buf, prefix, maxbuflen);
400 strscat(buf, key, maxbuflen);
402 strscat(buf, "=", maxbuflen);
403 strscat(buf, val, maxbuflen);
408 static void enable_default_ext4_features(struct mkfs_opts *mop, char *anchor,
409 size_t maxbuflen, int user_spec)
411 if (IS_OST(&mop->mo_ldd)) {
412 append_unique(anchor, user_spec ? "," : " -O ",
413 "extents", NULL, sizeof(mop->mo_mkfsopts));
414 append_unique(anchor, ",", "uninit_bg", NULL, maxbuflen);
415 } else if (IS_MDT(&mop->mo_ldd)) {
416 append_unique(anchor, user_spec ? "," : " -O ",
417 "dirdata", NULL, maxbuflen);
418 append_unique(anchor, ",", "uninit_bg", NULL, maxbuflen);
419 append_unique(anchor, ",", "^extents", NULL, maxbuflen);
421 append_unique(anchor, user_spec ? "," : " -O ",
422 "uninit_bg", NULL, maxbuflen);
425 /* Multiple mount protection enabled only if failover node specified */
426 if (mop->mo_flags & MO_FAILOVER) {
427 if (is_e2fsprogs_feature_supp("-O mmp") == 0)
428 append_unique(anchor, ",", "mmp", NULL, maxbuflen);
430 disp_old_e2fsprogs_msg("mmp", 1);
433 /* Allow more than 65000 subdirectories */
434 if (is_e2fsprogs_feature_supp("-O dir_nlink") == 0)
435 append_unique(anchor, ",", "dir_nlink", NULL, maxbuflen);
437 /* The following options are only valid for ext4-based ldiskfs.
438 * If --backfstype=ext3 is specified, do not enable them. */
439 if (mop->mo_ldd.ldd_mount_type == LDD_MT_EXT3)
442 /* Allow files larger than 2TB. Also needs LU-16, but not harmful. */
443 if (is_e2fsprogs_feature_supp("-O huge_file") == 0)
444 append_unique(anchor, ",", "huge_file", NULL, maxbuflen);
446 /* Enable large block addresses if the LUN is over 2^32 blocks. */
447 if (mop->mo_device_sz / (L_BLOCK_SIZE >> 10) >= 0x100002000ULL &&
448 is_e2fsprogs_feature_supp("-O 64bit") == 0)
449 append_unique(anchor, ",", "64bit", NULL, maxbuflen);
451 /* Cluster inode/block bitmaps and inode table for more efficient IO.
452 * Align the flex groups on a 1MB boundary for better performance. */
453 /* This -O feature needs to go last, since it adds the "-G" option. */
454 if (is_e2fsprogs_feature_supp("-O flex_bg") == 0) {
457 append_unique(anchor, ",", "flex_bg", NULL, maxbuflen);
459 if (IS_OST(&mop->mo_ldd)) {
460 snprintf(tmp_buf, sizeof(tmp_buf), " -G %u",
461 (1 << 20) / L_BLOCK_SIZE);
462 strscat(anchor, tmp_buf, maxbuflen);
465 /* Don't add any more "-O" options here, see last comment above */
469 * moveopts_to_end: find the option string, move remaining strings to
470 * where option string starts, and append the option
472 * @start: where the option string starts before the move
473 * RETURN: where the option string starts after the move
475 static char *moveopts_to_end(char *start)
480 /* skip whitespace before options */
485 /* find end of option characters */
486 while (*end != ' ' && *end != '\0')
490 strncpy(save, start, end - start);
491 save[end - start] = '\0';
493 /* move remaining options up front */
495 memmove(start, end, strlen(end));
496 *(start + strlen(end)) = '\0';
498 /* append the specified options */
499 if (*(start + strlen(start) - 1) != ' ')
501 idx = start + strlen(start);
507 /* Build fs according to type */
508 int ldiskfs_make_lustre(struct mkfs_opts *mop)
510 __u64 device_sz = mop->mo_device_sz, block_count = 0;
511 char mkfs_cmd[PATH_MAX];
515 int ret = 0, ext_opts = 0;
518 if (!(mop->mo_flags & MO_IS_LOOP)) {
519 mop->mo_device_sz = get_device_size(mop->mo_device);
521 if (mop->mo_device_sz == 0)
524 /* Compare to real size */
525 if (device_sz == 0 || device_sz > mop->mo_device_sz)
526 device_sz = mop->mo_device_sz;
528 mop->mo_device_sz = device_sz;
531 if (mop->mo_device_sz != 0) {
532 if (mop->mo_device_sz < 8096){
533 fprintf(stderr, "%s: size of filesystem must be larger "
534 "than 8MB, but is set to %lldKB\n",
535 progname, (long long)mop->mo_device_sz);
538 block_count = mop->mo_device_sz / (L_BLOCK_SIZE >> 10);
539 /* If the LUN size is just over 2^32 blocks, limit the
540 * filesystem size to 2^32-1 blocks to avoid problems with
541 * ldiskfs/mkfs not handling this size. Bug 22906 */
542 if (block_count > 0xffffffffULL && block_count < 0x100002000ULL)
543 block_count = 0xffffffffULL;
546 if ((mop->mo_ldd.ldd_mount_type == LDD_MT_EXT3) ||
547 (mop->mo_ldd.ldd_mount_type == LDD_MT_LDISKFS) ||
548 (mop->mo_ldd.ldd_mount_type == LDD_MT_LDISKFS2)) {
551 /* Journal size in MB */
552 if (strstr(mop->mo_mkfsopts, "-J") == NULL) {
553 /* Choose our own default journal size */
554 long journal_sz = 0, max_sz;
555 if (device_sz > 1024 * 1024) /* 1GB */
556 journal_sz = (device_sz / 102400) * 4;
557 /* cap journal size at 1GB */
558 if (journal_sz > 1024L)
561 max_sz = (102400 * L_BLOCK_SIZE) >> 20; /* 400MB */
562 if (journal_sz > max_sz)
565 sprintf(buf, " -J size=%ld", journal_sz);
566 strscat(mop->mo_mkfsopts, buf,
567 sizeof(mop->mo_mkfsopts));
571 /* Inode size (for extended attributes). The LOV EA size is
572 * 32 (EA hdr) + 32 (lov_mds_md) + stripes * 24 (lov_ost_data),
573 * and we want some margin above that for ACLs, other EAs... */
574 if (strstr(mop->mo_mkfsopts, "-I") == NULL) {
575 if (IS_MDT(&mop->mo_ldd)) {
576 if (mop->mo_stripe_count > 72)
577 inode_size = 512; /* bz 7241 */
578 /* see also "-i" below for EA blocks */
579 else if (mop->mo_stripe_count > 32)
581 else if (mop->mo_stripe_count > 10)
585 } else if (IS_OST(&mop->mo_ldd)) {
586 /* We store MDS FID and OST objid in EA on OST
587 * we need to make inode bigger as well. */
591 if (inode_size > 0) {
592 sprintf(buf, " -I %ld", inode_size);
593 strscat(mop->mo_mkfsopts, buf,
594 sizeof(mop->mo_mkfsopts));
598 /* Bytes_per_inode: disk size / num inodes */
599 if (strstr(mop->mo_mkfsopts, "-i") == NULL &&
600 strstr(mop->mo_mkfsopts, "-N") == NULL) {
601 long bytes_per_inode = 0;
603 /* Allocate more inodes on MDT devices. There is
604 * no data stored on the MDT, and very little extra
605 * metadata beyond the inode. It could go down as
606 * low as 1024 bytes, but this is conservative.
607 * Account for external EA blocks for wide striping. */
608 if (IS_MDT(&mop->mo_ldd)) {
609 bytes_per_inode = inode_size + 1536;
611 if (mop->mo_stripe_count > 72) {
612 int extra = mop->mo_stripe_count * 24;
613 extra = ((extra - 1) | 4095) + 1;
614 bytes_per_inode += extra;
618 /* Allocate fewer inodes on large OST devices. Most
619 * filesystems can be much more aggressive than even
620 * this, but it is impossible to know in advance. */
621 if (IS_OST(&mop->mo_ldd)) {
622 /* OST > 16TB assume average file size 1MB */
623 if (device_sz > (16ULL << 30))
624 bytes_per_inode = 1024 * 1024;
625 /* OST > 4TB assume average file size 512kB */
626 else if (device_sz > (4ULL << 30))
627 bytes_per_inode = 512 * 1024;
628 /* OST > 1TB assume average file size 256kB */
629 else if (device_sz > (1ULL << 30))
630 bytes_per_inode = 256 * 1024;
631 /* OST > 10GB assume average file size 64kB,
632 * plus a bit so that inodes will fit into a
633 * 256x flex_bg without overflowing */
634 else if (device_sz > (10ULL << 20))
635 bytes_per_inode = 69905;
638 if (bytes_per_inode > 0) {
639 sprintf(buf, " -i %ld", bytes_per_inode);
640 strscat(mop->mo_mkfsopts, buf,
641 sizeof(mop->mo_mkfsopts));
646 strscat(mop->mo_mkfsopts, " -q",
647 sizeof(mop->mo_mkfsopts));
650 /* start handle -O mkfs options */
651 if ((start = strstr(mop->mo_mkfsopts, "-O")) != NULL) {
652 if (strstr(start + 2, "-O") != NULL) {
654 "%s: don't specify multiple -O options\n",
658 start = moveopts_to_end(start);
659 maxbuflen = sizeof(mop->mo_mkfsopts) -
660 (start - mop->mo_mkfsopts) - strlen(start);
661 enable_default_ext4_features(mop, start, maxbuflen, 1);
663 start = mop->mo_mkfsopts + strlen(mop->mo_mkfsopts),
664 maxbuflen = sizeof(mop->mo_mkfsopts) -
665 strlen(mop->mo_mkfsopts);
666 enable_default_ext4_features(mop, start, maxbuflen, 0);
668 /* end handle -O mkfs options */
670 /* start handle -E mkfs options */
671 if ((start = strstr(mop->mo_mkfsopts, "-E")) != NULL) {
672 if (strstr(start + 2, "-E") != NULL) {
674 "%s: don't specify multiple -E options\n",
678 start = moveopts_to_end(start);
679 maxbuflen = sizeof(mop->mo_mkfsopts) -
680 (start - mop->mo_mkfsopts) - strlen(start);
683 start = mop->mo_mkfsopts + strlen(mop->mo_mkfsopts);
684 maxbuflen = sizeof(mop->mo_mkfsopts) -
685 strlen(mop->mo_mkfsopts);
688 /* In order to align the filesystem metadata on 1MB boundaries,
689 * give a resize value that will reserve a power-of-two group
690 * descriptor blocks, but leave one block for the superblock.
691 * Only useful for filesystems with < 2^32 blocks due to resize
693 if (IS_OST(&mop->mo_ldd) && mop->mo_device_sz > 100 * 1024 &&
694 mop->mo_device_sz * 1024 / L_BLOCK_SIZE <= 0xffffffffULL) {
695 unsigned group_blocks = L_BLOCK_SIZE * 8;
696 unsigned desc_per_block = L_BLOCK_SIZE / 32;
697 unsigned resize_blks;
699 resize_blks = (1ULL<<32) - desc_per_block*group_blocks;
700 snprintf(buf, sizeof(buf), "%u", resize_blks);
701 append_unique(start, ext_opts ? "," : " -E ",
702 "resize", buf, maxbuflen);
706 /* Avoid zeroing out the full journal - speeds up mkfs */
707 if (is_e2fsprogs_feature_supp("-E lazy_journal_init") == 0)
708 append_unique(start, ext_opts ? "," : " -E ",
709 "lazy_journal_init", NULL, maxbuflen);
710 /* end handle -E mkfs options */
712 /* Allow reformat of full devices (as opposed to
713 partitions.) We already checked for mounted dev. */
714 strscat(mop->mo_mkfsopts, " -F", sizeof(mop->mo_mkfsopts));
716 snprintf(mkfs_cmd, sizeof(mkfs_cmd),
717 "%s -j -b %d -L %s ", MKE2FS, L_BLOCK_SIZE,
718 mop->mo_ldd.ldd_svname);
720 fprintf(stderr,"%s: unsupported fs type: %d (%s)\n",
721 progname, mop->mo_ldd.ldd_mount_type,
722 MT_STR(&mop->mo_ldd));
726 /* For loop device format the dev, not the filename */
727 dev = mop->mo_device;
728 if (mop->mo_flags & MO_IS_LOOP)
729 dev = mop->mo_loopdev;
731 vprint("formatting backing filesystem %s on %s\n",
732 MT_STR(&mop->mo_ldd), dev);
733 vprint("\ttarget name %s\n", mop->mo_ldd.ldd_svname);
734 vprint("\t4k blocks "LPU64"\n", block_count);
735 vprint("\toptions %s\n", mop->mo_mkfsopts);
737 /* mkfs_cmd's trailing space is important! */
738 strscat(mkfs_cmd, mop->mo_mkfsopts, sizeof(mkfs_cmd));
739 strscat(mkfs_cmd, " ", sizeof(mkfs_cmd));
740 strscat(mkfs_cmd, dev, sizeof(mkfs_cmd));
741 if (block_count != 0) {
742 sprintf(buf, " "LPU64, block_count);
743 strscat(mkfs_cmd, buf, sizeof(mkfs_cmd));
746 vprint("mkfs_cmd = %s\n", mkfs_cmd);
747 ret = run_command(mkfs_cmd, sizeof(mkfs_cmd));
750 fprintf(stderr, "Unable to build fs %s (%d)\n", dev, ret);
755 int ldiskfs_prepare_lustre(struct mkfs_opts *mop,
756 char *default_mountopts, int default_len,
757 char *always_mountopts, int always_len)
759 struct lustre_disk_data *ldd = &mop->mo_ldd;
762 /* Set MO_IS_LOOP to indicate a loopback device is needed */
763 ret = is_block(mop->mo_device);
766 } else if (ret == 0) {
767 mop->mo_flags |= MO_IS_LOOP;
770 strscat(default_mountopts, ",errors=remount-ro", default_len);
771 if (IS_MDT(ldd) || IS_MGS(ldd))
772 strscat(always_mountopts, ",user_xattr", always_len);
777 int read_file(char *path, char *buf, int size)
781 fd = fopen(path, "r");
785 /* should not ignore fgets(3)'s return value */
786 if (!fgets(buf, size, fd)) {
787 fprintf(stderr, "reading from %s: %s", path, strerror(errno));
795 int write_file(char *path, char *buf)
799 fd = fopen(path, "w");
808 /* This is to tune the kernel for good SCSI performance.
809 * For that we set the value of /sys/block/{dev}/queue/max_sectors_kb
810 * to the value of /sys/block/{dev}/queue/max_hw_sectors_kb */
811 int set_blockdev_tunables(char *source, struct mount_opts *mop, int fan_out)
813 glob_t glob_info = { 0 };
814 struct stat stat_buf;
815 char *chk_major, *chk_minor;
816 char *savept = NULL, *dev;
818 char buf[PATH_MAX] = {'\0'}, path[PATH_MAX] = {'\0'};
819 char real_path[PATH_MAX] = {'\0'};
826 ret_path = realpath(source, real_path);
827 if (ret_path == NULL) {
829 fprintf(stderr, "warning: %s: cannot resolve: %s\n",
830 source, strerror(errno));
834 if (strncmp(real_path, "/dev/loop", 9) == 0)
837 if ((real_path[0] != '/') && (strpbrk(real_path, ",:") != NULL))
840 snprintf(path, sizeof(path), "/sys/block%s", real_path + 4);
841 if (access(path, X_OK) == 0)
844 /* The name of the device say 'X' specified in /dev/X may not
845 * match any entry under /sys/block/. In that case we need to
846 * match the major/minor number to find the entry under
847 * sys/block corresponding to /dev/X */
849 /* Don't chop tail digit on /dev/mapper/xxx, LU-478 */
850 if (strncmp(real_path, "/dev/mapper", 11) != 0) {
851 dev = real_path + strlen(real_path);
852 while (--dev > real_path && isdigit(*dev))
855 if (strncmp(real_path, "/dev/md_", 8) == 0)
859 rc = stat(real_path, &stat_buf);
862 fprintf(stderr, "warning: %s, device %s stat failed\n",
863 strerror(errno), real_path);
867 major = major(stat_buf.st_rdev);
868 minor = minor(stat_buf.st_rdev);
869 rc = glob("/sys/block/*", GLOB_NOSORT, NULL, &glob_info);
872 fprintf(stderr, "warning: failed to read entries under "
874 globfree(&glob_info);
878 for (i = 0; i < glob_info.gl_pathc; i++){
879 snprintf(path, sizeof(path), "%s/dev", glob_info.gl_pathv[i]);
881 rc = read_file(path, buf, sizeof(buf));
885 if (buf[strlen(buf) - 1] == '\n')
886 buf[strlen(buf) - 1] = '\0';
888 chk_major = strtok_r(buf, ":", &savept);
890 if (major == atoi(chk_major) &&minor == atoi(chk_minor))
894 if (i == glob_info.gl_pathc) {
896 fprintf(stderr,"warning: device %s does not match any "
897 "entry under /sys/block\n", real_path);
898 globfree(&glob_info);
902 /* Chop off "/dev" from path we found */
903 path[strlen(glob_info.gl_pathv[i])] = '\0';
904 globfree(&glob_info);
907 if (strncmp(real_path, "/dev/md", 7) == 0) {
908 snprintf(real_path, sizeof(real_path), "%s/%s", path,
911 rc = read_file(real_path, buf, sizeof(buf));
914 fprintf(stderr, "warning: opening %s: %s\n",
915 real_path, strerror(errno));
919 if (atoi(buf) >= mop->mo_md_stripe_cache_size)
922 if (strlen(buf) - 1 > 0) {
923 snprintf(buf, sizeof(buf), "%d",
924 mop->mo_md_stripe_cache_size);
925 rc = write_file(real_path, buf);
927 fprintf(stderr, "warning: opening %s: %s\n",
928 real_path, strerror(errno));
930 /* Return since raid and disk tunables are different */
934 snprintf(real_path, sizeof(real_path), "%s/%s", path,
935 MAX_HW_SECTORS_KB_PATH);
936 rc = read_file(real_path, buf, sizeof(buf));
939 fprintf(stderr, "warning: opening %s: %s\n",
940 real_path, strerror(errno));
941 /* No MAX_HW_SECTORS_KB_PATH isn't necessary an
942 * error for some device. */
946 if (strlen(buf) - 1 > 0) {
947 snprintf(real_path, sizeof(real_path), "%s/%s", path,
948 MAX_SECTORS_KB_PATH);
949 rc = write_file(real_path, buf);
952 fprintf(stderr, "warning: writing to %s: %s\n",
953 real_path, strerror(errno));
954 /* No MAX_SECTORS_KB_PATH isn't necessary an
955 * error for some device. */
962 glob_info.gl_pathc = 0;
963 glob_info.gl_offs = 0;
964 /* if device is multipath device, tune its slave devices */
965 snprintf(real_path, sizeof(real_path), "%s/slaves/*", path);
966 rc = glob(real_path, GLOB_NOSORT, NULL, &glob_info);
968 for (i = 0; rc == 0 && i < glob_info.gl_pathc; i++){
969 slave = basename(glob_info.gl_pathv[i]);
970 snprintf(real_path, sizeof(real_path), "/dev/%s", slave);
971 rc = set_blockdev_tunables(real_path, mop, 0);
974 if (rc == GLOB_NOMATCH) {
975 /* no slave device is not an error */
977 } else if (rc && verbose) {
979 fprintf(stderr, "warning: %s, failed to read"
980 " entries under %s/slaves\n",
981 strerror(errno), path);
983 fprintf(stderr, "unable to set tunables for"
984 " slave device %s (slave would be"
985 " unable to handle IO request from"
990 globfree(&glob_info);
996 int ldiskfs_tune_lustre(char *dev, struct mount_opts *mop)
998 return set_blockdev_tunables(dev, mop, 1);
1001 int ldiskfs_label_lustre(struct mount_opts *mop)
1003 char label_cmd[PATH_MAX];
1006 snprintf(label_cmd, sizeof(label_cmd), E2LABEL" %s %s",
1007 mop->mo_source, mop->mo_ldd.ldd_svname);
1008 rc = run_command(label_cmd, sizeof(label_cmd));
1013 /* return canonicalized absolute pathname, even if the target file does not
1014 * exist, unlike realpath */
1015 static char *absolute_path(char *devname)
1017 char buf[PATH_MAX + 1];
1021 path = malloc(PATH_MAX + 1);
1025 if (devname[0] != '/') {
1026 if (getcwd(buf, sizeof(buf) - 1) == NULL)
1029 strcat(buf, devname);
1031 strcpy(buf, devname);
1033 /* truncate filename before calling realpath */
1034 ptr = strrchr(buf, '/');
1040 if (path != realpath(buf, path)) {
1044 /* add the filename back */
1046 strcat(path, ptr + 1);
1050 /* Determine if a device is a block device (as opposed to a file) */
1051 int is_block(char* devname)
1057 devpath = absolute_path(devname);
1058 if (devpath == NULL) {
1059 fprintf(stderr, "%s: failed to resolve path to %s\n",
1064 ret = access(devname, F_OK);
1066 if (strncmp(devpath, "/dev/", 5) == 0) {
1067 /* nobody sane wants to create a loopback file under
1068 * /dev. Let's just report the device doesn't exist */
1069 fprintf(stderr, "%s: %s apparently does not exist\n",
1077 ret = stat(devpath, &st);
1079 fprintf(stderr, "%s: cannot stat %s\n", progname, devpath);
1082 ret = S_ISBLK(st.st_mode);
1088 int ldiskfs_init(void)
1090 /* Required because full path to DEBUGFS is not specified */
1091 setenv("PATH", "/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin", 0);
1096 void ldiskfs_fini(void)