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bcache-tools.14286
0001-bcache-tools-Allow-user-to-set-label-for-d...
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File 0001-bcache-tools-Allow-user-to-set-label-for-device.patch of Package bcache-tools.14286
From 7f5f654ff252cfc899c52c848f3e08c55f778f51 Mon Sep 17 00:00:00 2001 From: Shaoxiong Li <dahefanteng@gmail.com> Date: Wed, 12 Sep 2018 14:48:31 +0800 Subject: [PATCH 06/16] bcache-tools: Allow user to set label for device Git-commit: 7f5f654ff252cfc899c52c848f3e08c55f778f51 Patch-mainline: bcache-tools-1.1 References: bsc#1139948 Add option '--label' for 'bcache make' to add label to bcache device Add subcommand 'set-label' which is used to set label for active backend device Only users with root privilege are allowd to run the 'bcache' command Signed-off-by: Shaoxiong Li <dahefanteng@gmail.com> Signed-off-by: Coly Li <colyli@suse.de> --- bcache-main.c | 42 +++++++++++++++++++++++++++++++++++++----- lib.c | 45 +++++++++++++++++++++++++++++++++++++-------- lib.h | 1 + make.c | 30 +++++++++++++++++++++++------- 4 files changed, 98 insertions(+), 20 deletions(-) diff --git a/bcache-main.c b/bcache-main.c index 53da0bb..e424535 100644 --- a/bcache-main.c +++ b/bcache-main.c @@ -52,7 +52,7 @@ bool bad_uuid(char *uuid) regmatch_t regmatche; if (regcomp(®, pattern, REG_EXTENDED) != 0) - fprintf(stderr, "Error happen when check uuid format:%m"); + fprintf(stderr, "Error happen when check uuid format:%m\n"); status = regexec(®, uuid, 1, ®matche, 0); regfree(®); if (status == REG_NOMATCH) @@ -70,7 +70,7 @@ bool bad_dev(char *devname) if (regcomp(®, pattern, REG_EXTENDED) != 0) { fprintf(stderr, - "Error happen when check device name format:%m"); + "Error happen when check device name format:%m\n"); } status = regexec(®, devname, 1, ®matche, 0); regfree(®); @@ -92,7 +92,8 @@ int main_usage(void) " unregister unregister device from kernel\n" " attach attach backend device(data device) to cache device\n" " detach detach backend device(data device) from cache device\n" - " set-cachemode set cachemode for backend device\n"); + " set-cachemode set cachemode for backend device\n" + " set-label set label for backend device\n"); return EXIT_FAILURE; } @@ -146,6 +147,12 @@ int setcachemode_usage(void) return EXIT_FAILURE; } +int setlabel_usage(void) +{ + fprintf(stderr, + "Usage:set-label devicename label\n(only for backend device)\n"); + return EXIT_FAILURE; +} void free_dev(struct list_head *head) { @@ -462,7 +469,7 @@ int attach_both(char *cdev, char *backdev) ret = detail_dev(cdev, &bd, &cd, &type); if (type != BCACHE_SB_VERSION_CDEV && type != BCACHE_SB_VERSION_CDEV_WITH_UUID) { - fprintf(stderr, "%s is not an cache device", cdev); + fprintf(stderr, "%s is not an cache device\n", cdev); return 1; } strcpy(buf, cd.base.cset); @@ -472,10 +479,24 @@ int attach_both(char *cdev, char *backdev) return attach_backdev(buf, backdev); } +bool has_permission(void) +{ + uid_t euid = geteuid(); + + if (euid != 0) + return false; + return true; +} + int main(int argc, char **argv) { char *subcmd; + if (!has_permission()) { + fprintf(stderr, + "Only root or users who has root priviledges can run this command\n"); + return 1; + } if (argc < 2) { main_usage(); return 1; @@ -592,7 +613,18 @@ int main(int argc, char **argv) fprintf(stderr, "Error:Wrong device name found\n"); return 1; } - return set_backdev_cachemode(argv[1], argv[2]); + } else if (strcmp(subcmd, "set-label") == 0) { + if (argc != 3) + return setlabel_usage(); + if (bad_dev(argv[1])) { + fprintf(stderr, "Error:Wrong device name found\n"); + return 1; + } + if (strlen(argv[2]) >= SB_LABEL_SIZE) { + fprintf(stderr, "Label is too long\n"); + return 1; + } + return set_label(argv[1], argv[2]); } main_usage(); return 0; diff --git a/lib.c b/lib.c index a15c263..6592110 100644 --- a/lib.c +++ b/lib.c @@ -79,7 +79,7 @@ bool part_of_disk(char *devname, char *partname) sprintf(pattern, "^%s.*[0-9]$", devname); if (regcomp(®, pattern, REG_EXTENDED) != 0) - fprintf(stderr, "Error happen when compile reg"); + fprintf(stderr, "Error happen when compile reg\n"); status = regexec(®, partname, 1, ®matche, 0); regfree(®); if (status == REG_NOMATCH) @@ -96,7 +96,7 @@ int find_location(char *location, char *devname) blockdir = opendir("/sys/block"); if (blockdir == NULL) { - fprintf(stderr, "Failed to open dir /sys/block/"); + fprintf(stderr, "Failed to open dir /sys/block/\n"); return 1; } sprintf(path, "/sys/block/%s/bcache", devname); @@ -426,7 +426,7 @@ int detail_dev(char *devname, struct bdev *bd, struct cdev *cd, int *type) expected_csum = csum_set(&sb); if (!(sb.csum == expected_csum)) { - fprintf(stderr, "Csum is not match with expected one"); + fprintf(stderr, "Csum is not match with expected one\n"); goto Fail; } @@ -448,7 +448,7 @@ int detail_dev(char *devname, struct bdev *bd, struct cdev *cd, int *type) cd->pos = sb.nr_this_dev; cd->replacement = CACHE_REPLACEMENT(&sb); } else { - fprintf(stderr, "Unknown bcache device type found"); + fprintf(stderr, "Unknown bcache device type found\n"); goto Fail; } return 0; @@ -490,7 +490,7 @@ int unregister_cset(char *cset) return 1; } if (dprintf(fd, "%d\n", 1) < 0) { - fprintf(stderr, "Failed to unregist this cache device"); + fprintf(stderr, "Failed to unregister this cache device\n"); close(fd); return 1; } @@ -537,7 +537,7 @@ int unregister_both(char *cset) return 1; } if (dprintf(fd, "%d\n", 1) < 0) { - fprintf(stderr, "Failed to stop cset and its backends %m"); + fprintf(stderr, "Failed to stop cset and its backends %m\n"); close(fd); return 1; } @@ -592,7 +592,7 @@ int detach_backdev(char *devname) } if (dprintf(fd, "%d\n", 1) < 0) { close(fd); - fprintf(stderr, "Error detach device %s:%m", devname); + fprintf(stderr, "Error detach device %s:%m\n", devname); return 1; } close(fd); @@ -619,7 +619,7 @@ int set_backdev_cachemode(char *devname, char *cachemode) return 1; } if (dprintf(fd, "%s\n", cachemode) < 0) { - printf("Failed to set cachemode for device %s:%m\n", + fprintf(stderr, "Failed to set cachemode for device %s:%m\n", devname); close(fd); return 1; @@ -653,3 +653,32 @@ int get_backdev_cachemode(char *devname, char *mode) close(fd); return 0; } + +int set_label(char *devname, char *label) +{ + int fd, ret; + char path[150]; + char location[100] = ""; + char buf[20]; + + trim_prefix(buf, devname, DEV_PREFIX_LEN); + ret = find_location(location, buf); + if (ret < 0) + return ret; + sprintf(path, "/sys/block/%s/bcache/label", location); + fd = open(path, O_WRONLY); + if (fd < 0) { + fprintf(stderr, + "Can't open %s,Make sure the device name is correct\n", + path); + return 1; + } + if (dprintf(fd, "%s\n", label) < 0) { + fprintf(stderr, "Failed to set label for device %s:%m\n", + devname); + close(fd); + return 1; + } + close(fd); + return 0; +} diff --git a/lib.h b/lib.h index becc039..d4537b0 100644 --- a/lib.h +++ b/lib.h @@ -48,6 +48,7 @@ int unregister_cset(char *cset); int attach_backdev(char *cset, char *devname); int detach_backdev(char *devname); int set_backdev_cachemode(char *devname, char *cachemode); +int set_label(char *devname, char *label); int cset_to_devname(struct list_head *head, char *cset, char *devname); diff --git a/make.c b/make.c index 98eac78..b50bf80 100644 --- a/make.c +++ b/make.c @@ -166,6 +166,7 @@ void usage(void) " --writeback enable writeback\n" " --discard enable discards\n" " --force reformat a bcache device even if it is running\n" + " -l, --label set label for device\n" " --cache_replacement_policy=(lru|fifo)\n" " -h, --help display this help and exit\n"); exit(EXIT_FAILURE); @@ -183,7 +184,7 @@ static void write_sb(char *dev, unsigned int block_size, bool writeback, bool discard, bool wipe_bcache, unsigned int cache_replacement_policy, uint64_t data_offset, - uuid_t set_uuid, bool bdev, bool force) + uuid_t set_uuid, bool bdev, bool force, char *label) { int fd; char uuid_str[40], set_uuid_str[40], zeroes[SB_START] = {0}; @@ -253,7 +254,7 @@ static void write_sb(char *dev, unsigned int block_size, if (pwrite(fd, zeroes, sizeof(sb), SB_START) != sizeof(sb)) { fprintf(stderr, - "Failed to erase super block for %s", + "Failed to erase super block for %s\n", dev); exit(EXIT_FAILURE); } @@ -354,8 +355,15 @@ static void write_sb(char *dev, unsigned int block_size, putchar('\n'); } - sb.csum = csum_set(&sb); + /* write label */ + int num, i; + num = strlen(label); + for (i = 0; i < num; i++) + sb.label[i] = label[i]; + sb.label[i] = '\0'; + /* write csum */ + sb.csum = csum_set(&sb); /* Zero start of disk */ if (pwrite(fd, zeroes, SB_START, 0) != SB_START) { perror("write error\n"); @@ -419,7 +427,7 @@ int make_bcache(int argc, char **argv) unsigned int i, ncache_devices = 0, nbacking_devices = 0; char *cache_devices[argc]; char *backing_devices[argc]; - + char label[SB_LABEL_SIZE]; unsigned int block_size = 0, bucket_size = 1024; int writeback = 0, discard = 0, wipe_bcache = 0, force = 0; unsigned int cache_replacement_policy = 0; @@ -443,11 +451,12 @@ int make_bcache(int argc, char **argv) { "cset-uuid", 1, NULL, 'u' }, { "help", 0, NULL, 'h' }, { "force", 0, &force, 1 }, + { "label", 1, NULL, 'l' }, { NULL, 0, NULL, 0 }, }; while ((c = getopt_long(argc, argv, - "-hCBUo:w:b:", + "-hCBUo:w:b:l:", opts, NULL)) != -1) switch (c) { case 'C': @@ -489,6 +498,13 @@ int make_bcache(int argc, char **argv) exit(EXIT_FAILURE); } break; + case 'l': + if (strlen(optarg) >= SB_LABEL_SIZE) { + fprintf(stderr, "Label is too long\n"); + exit(EXIT_FAILURE); + } + strcpy(label, optarg); + break; case 'h': usage(); break; @@ -530,13 +546,13 @@ int make_bcache(int argc, char **argv) write_sb(cache_devices[i], block_size, bucket_size, writeback, discard, wipe_bcache, cache_replacement_policy, - data_offset, set_uuid, false, force); + data_offset, set_uuid, false, force, label); for (i = 0; i < nbacking_devices; i++) write_sb(backing_devices[i], block_size, bucket_size, writeback, discard, wipe_bcache, cache_replacement_policy, - data_offset, set_uuid, true, force); + data_offset, set_uuid, true, force, label); return 0; } -- 2.25.0
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