Add -i (ignore offset) option to logical-resolve command to show how BTRFS_IOC_LOGICAL_INO_V2 ioctl works (returns every ref to the extent of given logical address).
[Example] $ mkfs.btrfs -f $DEV $ mount $DEV /mnt $ dd if=/dev/urandom of=/mnt/file bs=4k count=100 # split above extent $ dd if=/dev/urandom of=/mnt/file bs=4k seek=10 count=1 conv=notrunc $ btrfs filesystem sync # v1 $ btrfs inspect-internal logical-resolve -P 13631488 /mnt inode 257 offset 0 root 5 # v2 $ btrfs inspect-internal logical-resolve -iP 13631488 /mnt inode 257 offset 0 root 5 inode 257 offset 45056 root 5 Signed-off-by: Misono Tomohiro <misono.tomoh...@jp.fujitsu.com> --- Documentation/btrfs-inspect-internal.asciidoc | 4 ++++ cmds-inspect.c | 17 +++++++++++++++-- ioctl.h | 10 +++++++++- libbtrfsutil/btrfs.h | 10 +++++++++- 4 files changed, 37 insertions(+), 4 deletions(-) diff --git a/Documentation/btrfs-inspect-internal.asciidoc b/Documentation/btrfs-inspect-internal.asciidoc index e2db6466..a55c9add 100644 --- a/Documentation/btrfs-inspect-internal.asciidoc +++ b/Documentation/btrfs-inspect-internal.asciidoc @@ -125,6 +125,10 @@ skip the path resolving and print the inodes instead verbose mode, print count of returned paths and all ioctl() return values -s <bufsize>:::: set internal buffer for storing the file names to 'bufsize', default is 4096, maximum 64k +-i:::: +ignore offset and return all the ref information +which points to the extent containing given logical address. +This requires version 2 ioctl support (BTRFS_IOC_LOGICAL_INO_V2, since 4.15). *min-dev-size* [options] <path>:: (needs root privileges) diff --git a/cmds-inspect.c b/cmds-inspect.c index 2fc50c1a..d47eeacb 100644 --- a/cmds-inspect.c +++ b/cmds-inspect.c @@ -131,6 +131,9 @@ static const char * const cmd_inspect_logical_resolve_usage[] = { "-s bufsize set inode container's size. This is used to increase inode", " container's size in case it is not enough to read all the ", " resolved results. The max value one can set is 64k", + "-i ignore offset and return all the ref information", + " which points to the extent containing given logical address", + " (requires version 2 ioctl support)", NULL }; @@ -142,7 +145,9 @@ static int cmd_inspect_logical_resolve(int argc, char **argv) int verbose = 0; int getpath = 1; int bytes_left; + int ignore_offset = 0; struct btrfs_ioctl_logical_ino_args loi; + unsigned long ioctl_num = BTRFS_IOC_LOGICAL_INO; struct btrfs_data_container *inodes; u64 size = 4096; char full_path[PATH_MAX]; @@ -151,7 +156,7 @@ static int cmd_inspect_logical_resolve(int argc, char **argv) optind = 0; while (1) { - int c = getopt(argc, argv, "Pvs:"); + int c = getopt(argc, argv, "Pvs:i"); if (c < 0) break; @@ -165,6 +170,9 @@ static int cmd_inspect_logical_resolve(int argc, char **argv) case 's': size = arg_strtou64(optarg); break; + case 'i': + ignore_offset = 1; + break; default: usage(cmd_inspect_logical_resolve_usage); } @@ -183,13 +191,18 @@ static int cmd_inspect_logical_resolve(int argc, char **argv) loi.size = size; loi.inodes = ptr_to_u64(inodes); + if (ignore_offset) { + loi.flags = BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET; + ioctl_num = BTRFS_IOC_LOGICAL_INO_V2; + } + fd = btrfs_open_dir(argv[optind + 1], &dirstream, 1); if (fd < 0) { ret = 12; goto out; } - ret = ioctl(fd, BTRFS_IOC_LOGICAL_INO, &loi); + ret = ioctl(fd, ioctl_num, &loi); if (ret < 0) { error("logical ino ioctl: %m"); goto out; diff --git a/ioctl.h b/ioctl.h index 709e996f..74f30c20 100644 --- a/ioctl.h +++ b/ioctl.h @@ -491,10 +491,16 @@ BUILD_ASSERT(sizeof(struct btrfs_ioctl_ino_path_args) == 56); struct btrfs_ioctl_logical_ino_args { __u64 logical; /* in */ __u64 size; /* in */ - __u64 reserved[4]; + __u64 reserved[3]; /* must be 0 for now */ + __u64 flags; /* in, v2 only */ /* struct btrfs_data_container *inodes; out */ __u64 inodes; }; +/* + * Return every ref to the extent, not just those containing logical block. + * Requires logical == extent bytenr. + */ +#define BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET (1ULL << 0) enum btrfs_dev_stat_values { /* disk I/O failure stats */ @@ -828,6 +834,8 @@ static inline char *btrfs_err_str(enum btrfs_err_code err_code) struct btrfs_ioctl_feature_flags[3]) #define BTRFS_IOC_RM_DEV_V2 _IOW(BTRFS_IOCTL_MAGIC, 58, \ struct btrfs_ioctl_vol_args_v2) +#define BTRFS_IOC_LOGICAL_INO_V2 _IOWR(BTRFS_IOCTL_MAGIC, 59, \ + struct btrfs_ioctl_logical_ino_args) #ifdef __cplusplus } #endif diff --git a/libbtrfsutil/btrfs.h b/libbtrfsutil/btrfs.h index c293f6bf..b4debba7 100644 --- a/libbtrfsutil/btrfs.h +++ b/libbtrfsutil/btrfs.h @@ -609,10 +609,16 @@ struct btrfs_ioctl_ino_path_args { struct btrfs_ioctl_logical_ino_args { __u64 logical; /* in */ __u64 size; /* in */ - __u64 reserved[4]; + __u64 reserved[3]; /* must be 0 for now */ + __u64 flags; /* in, v2 only */ /* struct btrfs_data_container *inodes; out */ __u64 inodes; }; +/* + * Return every ref to the extent, not just those containing logical block. + * Requires logical == extent bytenr. + */ +#define BTRFS_LOGICAL_INO_ARGS_IGNORE_OFFSET (1ULL << 0) enum btrfs_dev_stat_values { /* disk I/O failure stats */ @@ -836,5 +842,7 @@ enum btrfs_err_code { struct btrfs_ioctl_feature_flags[3]) #define BTRFS_IOC_RM_DEV_V2 _IOW(BTRFS_IOCTL_MAGIC, 58, \ struct btrfs_ioctl_vol_args_v2) +#define BTRFS_IOC_LOGICAL_INO_V2 _IOWR(BTRFS_IOCTL_MAGIC, 59, \ + struct btrfs_ioctl_logical_ino_args) #endif /* _LINUX_BTRFS_H */ -- 2.14.4 -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html