List block checksums
WIP Signed-off-by: David Sterba <dsterba@suse.cz>
This commit is contained in:
David Sterba
parent
91d9eec1ff
commit
33a4d17155
195
cmds-inspect.c
195
cmds-inspect.c
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@ -19,9 +19,11 @@
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#include <unistd.h>
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#include <sys/ioctl.h>
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#include <errno.h>
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#include <sys/stat.h>
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#include "kerncompat.h"
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#include "ioctl.h"
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#include "ctree.h"
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#include "commands.h"
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#include "btrfs-list.h"
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@ -236,12 +238,205 @@ out:
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return ret;
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}
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static const char * const cmd_bsum_usage[] = {
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"btrfs inspect-internal _bsum <blockno> <file>",
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"Get file block checksum of given file",
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NULL
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};
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static int csum_for_offset(int fd, u64 offset, u8 *csums, int *count)
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{
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struct btrfs_ioctl_search_args args;
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struct btrfs_ioctl_search_key *sk = &args.key;
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struct btrfs_ioctl_search_header *sh;
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int ret = 0;
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int i;
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unsigned off;
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u32 *realcsums = (u32*)csums;
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sk->tree_id = BTRFS_CSUM_TREE_OBJECTID;
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sk->min_objectid = BTRFS_EXTENT_CSUM_OBJECTID;
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sk->max_objectid = BTRFS_EXTENT_CSUM_OBJECTID;
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sk->max_type = BTRFS_EXTENT_CSUM_KEY;
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sk->min_type = BTRFS_EXTENT_CSUM_KEY;
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sk->min_offset = offset;
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sk->max_offset = (u64)-1;
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sk->max_transid = (u64)-1;
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sk->nr_items = 1;
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printf("Search block: %llu\n", (unsigned long long)sk->min_offset);
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ret = ioctl(fd, BTRFS_IOC_TREE_SEARCH, &args);
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if (ret) {
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printf("%s: search ioctl: ioctl ret=%d, error: %s\n", __func__, ret, strerror(errno));
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ret = -1;
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goto out;
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}
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if (sk->nr_items == 0) {
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printf("no items found\n");
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ret = -2;
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goto out;
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}
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off = 0;
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*count = 0;
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for (i = 0; i < sk->nr_items; i++) {
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u32 item;
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int j;
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int csum_size = sizeof(item);
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sh = (struct btrfs_ioctl_search_header *)(args.buf +
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off);
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printf("SH: tid %llu objid %llu off %llu type %u len %u\n",
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(unsigned long long)sh->transid,
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(unsigned long long)sh->objectid,
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(unsigned long long)sh->offset,
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(unsigned)sh->type,
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(unsigned)sh->len);
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off += sizeof(*sh);
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for (j = 0; j < sh->len / csum_size; j++) {
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memcpy(&item, args.buf + off + j * csum_size, sizeof(item));
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printf("DATA[%d]: u32 = 0x%08x\n", j, item);
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realcsums[*count] = item;
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*count += 1;
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}
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off += sh->len;
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sk->min_objectid = sh->objectid;
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sk->min_type = sh->type;
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sk->min_offset = sh->offset;
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}
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out:
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return ret;
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}
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static int extent_offset_to_physical(int fd, u64 ino, u64 offset, u64 *phys)
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{
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struct btrfs_ioctl_search_args args;
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struct btrfs_ioctl_search_key *sk = &args.key;
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struct btrfs_ioctl_search_header *sh;
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int ret = 0;
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unsigned off;
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int i;
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sk->tree_id = BTRFS_FS_TREE_OBJECTID;
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sk->min_objectid = ino;
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sk->max_objectid = ino;
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sk->max_type = BTRFS_EXTENT_DATA_KEY;
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sk->min_type = BTRFS_EXTENT_DATA_KEY;
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sk->min_offset = offset;
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sk->max_offset = (u64)-1;
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sk->max_transid = (u64)-1;
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sk->nr_items = 1;
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printf("Search extent offset: %llu\n", (unsigned long long)sk->min_offset);
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ret = ioctl(fd, BTRFS_IOC_TREE_SEARCH, &args);
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if (ret) {
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printf("%s: search ioctl: ioctl ret=%d, error: %s\n", __func__, ret, strerror(errno));
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ret = -1;
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goto out;
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}
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if (sk->nr_items == 0) {
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printf("no items found\n");
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ret = -2;
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goto out;
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}
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off = 0;
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for (i = 0; i < sk->nr_items; i++) {
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struct btrfs_file_extent_item fi;
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sh = (struct btrfs_ioctl_search_header *)(args.buf +
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off);
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printf("SH: tid %llu objid %llu off %llu type %u len %u\n",
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(unsigned long long)sh->transid,
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(unsigned long long)sh->objectid,
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(unsigned long long)sh->offset,
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(unsigned)sh->type,
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(unsigned)sh->len);
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off += sizeof(*sh);
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/* process data */
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memcpy(&fi, args.buf + off, sizeof(fi));
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printf("FI: disk_bytenr %llu disk_num_bytes %llu offset %llu\n",
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(unsigned long long)fi.disk_bytenr,
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(unsigned long long)fi.disk_num_bytes,
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(unsigned long long)fi.offset);
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*phys = fi.disk_bytenr;
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off += sh->len;
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sk->min_objectid = sh->objectid;
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sk->min_type = sh->type;
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sk->min_offset = sh->offset;
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}
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out:
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return ret;
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}
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static int cmd_bsum(int argc, char **argv)
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{
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int fd;
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int ret = 0;
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int j;
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struct stat st;
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u8 csums[4096];
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int count = 0;
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u64 offset = 0;
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u64 phys = 0;
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optind = 1;
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while (1) {
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int c = getopt(argc, argv, "");
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if (c < 0)
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break;
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switch (c) {
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default:
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usage(cmd_logical_resolve_usage);
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}
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}
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if (check_argc_exact(argc - optind, 2)) {
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usage(cmd_logical_resolve_usage);
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return 1;
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}
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fd = open_file_or_dir(argv[optind+1]);
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if (fd < 0) {
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fprintf(stderr, "ERROR: can't access '%s'\n", argv[optind+1]);
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ret = 12;
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goto out;
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}
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offset = atoi(argv[optind]);
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if(fstat(fd, &st) == -1) {
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fprintf(stderr, "ERROR: stat\n");
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ret = 1;
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goto out;
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}
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printf("Inode: %llu\n", (unsigned long long)st.st_ino);
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printf("Offset: %llu\n", (unsigned long long)offset);
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extent_offset_to_physical(fd, st.st_ino, offset, &phys);
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printf("Physical: %llu\n", (unsigned long long)phys);
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csum_for_offset(fd, phys, csums, &count);
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for (j = 0; j < count; j++) {
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u32 *items = (u32*)csums;
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printf("BLOCK[%d] CSUM=0x%x\n",
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j, items[j]);
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}
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out:
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return ret;
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}
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const struct cmd_group inspect_cmd_group = {
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inspect_cmd_group_usage, NULL, {
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{ "inode-resolve", cmd_inode_resolve, cmd_inode_resolve_usage,
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NULL, 0 },
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{ "logical-resolve", cmd_logical_resolve,
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cmd_logical_resolve_usage, NULL, 0 },
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{ "_bsum", cmd_bsum,
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cmd_bsum_usage, NULL, 0 },
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{ 0, 0, 0, 0, 0 }
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}
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};
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@ -260,3 +260,7 @@ typedef u64 __bitwise __be64;
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#ifndef noinline
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#define noinline
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#endif
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#define __ALIGN_KERNEL(x, a) __ALIGN_KERNEL_MASK(x, (typeof(x))(a) - 1)
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#define __ALIGN_KERNEL_MASK(x, mask) (((x) + (mask)) & ~(mask))
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#define ALIGN(x, a) __ALIGN_KERNEL((x), (a))
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