Hi,
> This adds show sub-command to the btrfs subvol cli
> to display detailed inforamtion of the given subvol
> or snapshot.
>
> Signed-off-by: Anand Jain <anand.j...@oracle.com>
> ---
> btrfs-list.c | 25 +++++++--
> btrfs-list.h | 3 +-
> cmds-subvolume.c | 155
> +++++++++++++++++++++++++++++++++++++++++++++++++++++--
> man/btrfs.8.in | 6 +++
> 4 files changed, 182 insertions(+), 7 deletions(-)
>
> diff --git a/btrfs-list.c b/btrfs-list.c
> index 656de10..1915ece 100644
> --- a/btrfs-list.c
> +++ b/btrfs-list.c
> @@ -1335,6 +1335,22 @@ static void print_subvolume_column(struct root_info
> *subv,
> }
> }
>
> +static void print_single_volume_info_raw(struct root_info *subv, char
> *raw_prefix)
> +{
> + int i;
> +
> + for (i = 0; i < BTRFS_LIST_ALL; i++) {
> + if (!btrfs_list_columns[i].need_print)
> + continue;
> +
> + if (raw_prefix)
> + printf("%s",raw_prefix);
> +
> + print_subvolume_column(subv, i);
> + }
> + printf("\n");
> +}
> +
> static void print_single_volume_info_table(struct root_info *subv)
> {
> int i;
> @@ -1401,7 +1417,7 @@ static void print_all_volume_info_tab_head()
> }
>
> static void print_all_volume_info(struct root_lookup *sorted_tree,
> - int layout)
> + int layout, char *raw_prefix)
> {
> struct rb_node *n;
> struct root_info *entry;
> @@ -1419,6 +1435,9 @@ static void print_all_volume_info(struct root_lookup
> *sorted_tree,
> case BTRFS_LIST_LAYOUT_TABLE:
> print_single_volume_info_table(entry);
> break;
> + case BTRFS_LIST_LAYOUT_RAW:
> + print_single_volume_info_raw(entry, raw_prefix);
> + break;
> }
> n = rb_next(n);
> }
> @@ -1445,7 +1464,7 @@ int btrfs_list_subvols(int fd, struct root_lookup
> *root_lookup)
>
> int btrfs_list_subvols_print(int fd, struct btrfs_list_filter_set
> *filter_set,
> struct btrfs_list_comparer_set *comp_set,
> - int layout)
> + int layout, char *raw_prefix)
> {
> struct root_lookup root_lookup;
> struct root_lookup root_sort;
> @@ -1457,7 +1476,7 @@ int btrfs_list_subvols_print(int fd, struct
> btrfs_list_filter_set *filter_set,
> __filter_and_sort_subvol(&root_lookup, &root_sort, filter_set,
> comp_set, fd);
>
> - print_all_volume_info(&root_sort, layout);
> + print_all_volume_info(&root_sort, layout, raw_prefix);
> __free_all_subvolumn(&root_lookup);
>
> return 0;
> diff --git a/btrfs-list.h b/btrfs-list.h
> index 5b60068..09d35f7 100644
> --- a/btrfs-list.h
> +++ b/btrfs-list.h
> @@ -20,6 +20,7 @@
>
> #define BTRFS_LIST_LAYOUT_DEFAULT 0
> #define BTRFS_LIST_LAYOUT_TABLE 1
> +#define BTRFS_LIST_LAYOUT_RAW 2
>
> /*
> * one of these for each root we find.
> @@ -150,7 +151,7 @@ int btrfs_list_setup_comparer(struct
> btrfs_list_comparer_set **comp_set,
>
> int btrfs_list_subvols_print(int fd, struct btrfs_list_filter_set
> *filter_set,
> struct btrfs_list_comparer_set *comp_set,
> - int is_tab_result);
> + int layout, char *raw_prefix);
> int btrfs_list_find_updated_files(int fd, u64 root_id, u64 oldest_gen);
> int btrfs_list_get_default_subvolume(int fd, u64 *default_id);
> char *btrfs_list_path_for_root(int fd, u64 root);
> diff --git a/cmds-subvolume.c b/cmds-subvolume.c
> index bb9629f..6a14c4c 100644
> --- a/cmds-subvolume.c
> +++ b/cmds-subvolume.c
> @@ -24,6 +24,7 @@
> #include <libgen.h>
> #include <limits.h>
> #include <getopt.h>
> +#include <uuid/uuid.h>
>
> #include "kerncompat.h"
> #include "ioctl.h"
> @@ -418,10 +419,10 @@ static int cmd_subvol_list(int argc, char **argv)
>
> if (is_tab_result)
> ret = btrfs_list_subvols_print(fd, filter_set, comparer_set,
> - BTRFS_LIST_LAYOUT_TABLE);
> + BTRFS_LIST_LAYOUT_TABLE, NULL);
> else
> ret = btrfs_list_subvols_print(fd, filter_set, comparer_set,
> - BTRFS_LIST_LAYOUT_DEFAULT);
> + BTRFS_LIST_LAYOUT_DEFAULT, NULL);
> if (ret)
> return 19;
> return 0;
> @@ -634,7 +635,7 @@ static int cmd_subvol_get_default(int argc, char **argv)
> btrfs_list_setup_print_column(BTRFS_LIST_PATH);
>
> ret = btrfs_list_subvols_print(fd, filter_set, NULL,
> - BTRFS_LIST_LAYOUT_DEFAULT);
> + BTRFS_LIST_LAYOUT_DEFAULT, NULL);
> if (ret)
> return 19;
> return 0;
> @@ -721,6 +722,153 @@ static int cmd_find_new(int argc, char **argv)
> return 0;
> }
>
> +static const char * const cmd_subvol_show_usage[] = {
> + "btrfs subvolume show <subvol-path>",
> + "Show more information of the subvolume",
> + NULL
> +};
> +
> +static int cmd_subvol_show(int argc, char **argv)
> +{
> + struct root_info get_ri;
> + struct btrfs_list_filter_set *filter_set;
> + char tstr[256];
> + char uuidparse[37];
> + char *fullpath = NULL, *svpath = NULL, *mnt = NULL;
> + char raw_prefix[] = "\t\t\t\t";
> + u64 sv_id, mntid;
> + int fd = -1, mntfd = -1;
> + int ret = -1;
> +
> + if (check_argc_exact(argc, 2))
> + usage(cmd_subvol_show_usage);
> +
> + fullpath = realpath(argv[1], 0);
> + if (!fullpath) {
> + fprintf(stderr, "ERROR: finding real path for '%s', %s\n",
> + argv[1], strerror(errno));
> + goto out;
> + }
> +
> + ret = test_issubvolume(fullpath);
> + if (ret < 0) {
> + fprintf(stderr, "ERROR: error accessing '%s'\n", fullpath);
> + goto out;
> + }
> + if (!ret) {
> + fprintf(stderr, "ERROR: '%s' is not a subvolume\n", fullpath);
> + ret = -1;
> + goto out;
> + }
> +
> + ret = find_mount_root(fullpath, &mnt);
> + if (ret < 0) {
> + fprintf(stderr, "ERROR: find_mount_root failed on %s: "
> + "%s\n", fullpath, strerror(-ret));
> + goto out;
> + }
> + ret = -1;
> + svpath = get_subvol_name(mnt, fullpath);
> +
> + fd = open_file_or_dir(fullpath);
> + if (fd < 0) {
> + fprintf(stderr, "ERROR: can't access '%s'\n", fullpath);
> + goto out;
> + }
> +
> + sv_id = btrfs_list_get_path_rootid(fd);
> + if (sv_id < 0) {
> + fprintf(stderr, "ERROR: can't get rootid for '%s'\n",
> + fullpath);
> + goto out;
> + }
> +
> + mntfd = open_file_or_dir(mnt);
> + if (mntfd < 0) {
> + fprintf(stderr, "ERROR: can't access '%s'\n", mnt);
> + goto out;
> + }
> +
> + mntid = btrfs_list_get_path_rootid(mntfd);
> + if (mntid < 0) {
> + fprintf(stderr, "ERROR: can't get rootid for '%s'\n", mnt);
> + goto out;
> + }
> +
> + if (sv_id == BTRFS_FS_TREE_OBJECTID) {
> + printf("%s is btrfs root\n", fullpath);
> + goto out;
> + }
> +
> + memset(&get_ri, 0, sizeof(get_ri));
> + get_ri.root_id = sv_id;
> +
> + if (btrfs_get_subvol(mntfd, &get_ri)) {
> + fprintf(stderr, "ERROR: can't find '%s'\n",
> + svpath);
> + goto out;
> + }
> +
> + ret = 0;
> + /* print the info */
I think it will be better if you can move the following
printing to a function..it will make the code more clear and
readable..
Thanks,
Wang
> + printf("%s\n", fullpath);
> + printf("\tName: \t\t\t%s\n", get_ri.name);
> +
> + if (uuid_is_null(get_ri.uuid))
> + strcpy(uuidparse, "-");
> + else
> + uuid_unparse(get_ri.uuid, uuidparse);
> + printf("\tuuid: \t\t\t%s\n", uuidparse);
> +
> + if (uuid_is_null(get_ri.puuid))
> + strcpy(uuidparse, "-");
> + else
> + uuid_unparse(get_ri.puuid, uuidparse);
> + printf("\tParent uuid: \t\t%s\n", uuidparse);
> +
> + if (get_ri.otime)
> + strftime(tstr, 256, "%Y-%m-%d %X",
> + localtime(&get_ri.otime));
> + else
> + strcpy(tstr, "-");
> + printf("\tCreation time: \t\t%s\n", tstr);
> +
> + printf("\tObject ID: \t\t%llu\n", get_ri.root_id);
> + printf("\tGeneration (Gen): \t%llu\n", get_ri.gen);
> + printf("\tGen at creation: \t%llu\n", get_ri.ogen);
> + printf("\tParent: \t\t%llu\n", get_ri.ref_tree);
> + printf("\tTop Level: \t\t%llu\n", get_ri.top_id);
> +
> + /* print the snapshots of the given subvol if any*/
> + printf("\tSnapshot(s):\n");
> + filter_set = btrfs_list_alloc_filter_set();
> + btrfs_list_setup_filter(&filter_set, BTRFS_LIST_FILTER_BY_PARENT,
> + get_ri.uuid);
> + btrfs_list_setup_print_column(BTRFS_LIST_PATH);
> + btrfs_list_subvols_print(fd, filter_set, NULL, BTRFS_LIST_LAYOUT_RAW,
> + raw_prefix);
> +
> + /* clean up */
> + if (get_ri.path)
> + free(get_ri.path);
> + if (get_ri.name)
> + free(get_ri.name);
> + if (get_ri.full_path)
> + free(get_ri.full_path);
> +
> +out:
> + if (mntfd >= 0)
> + close(mntfd);
> + if (fd >= 0)
> + close(fd);
> + if (mnt)
> + free(mnt);
> + if (fullpath)
> + free(fullpath);
> +
> + return ret;
> +}
> +
> const struct cmd_group subvolume_cmd_group = {
> subvolume_cmd_group_usage, NULL, {
> { "create", cmd_subvol_create, cmd_subvol_create_usage, NULL, 0
> },
> @@ -732,6 +880,7 @@ const struct cmd_group subvolume_cmd_group = {
> { "set-default", cmd_subvol_set_default,
> cmd_subvol_set_default_usage, NULL, 0 },
> { "find-new", cmd_find_new, cmd_find_new_usage, NULL, 0 },
> + { "show", cmd_subvol_show, cmd_subvol_show_usage, NULL, 0 },
> { 0, 0, 0, 0, 0 }
> }
> };
> diff --git a/man/btrfs.8.in b/man/btrfs.8.in
> index d20e332..0008a06 100644
> --- a/man/btrfs.8.in
> +++ b/man/btrfs.8.in
> @@ -17,6 +17,8 @@ btrfs \- control a btrfs filesystem
> .PP
> \fBbtrfs\fP \fBsubvolume get-default\fP\fI <path>\fP
> .PP
> +\fBbtrfs\fP \fBsubvolume show\fP\fI <path>\fP
> +.PP
> \fBbtrfs\fP \fBfilesystem defragment\fP -c[zlib|lzo] [-l \fIlen\fR] \
> [-s \fIstart\fR] [-t \fIsize\fR] -[vf] <\fIfile\fR>|<\fIdir\fR> \
> [<\fIfile\fR>|<\fIdir\fR>...]
> @@ -158,6 +160,10 @@ Get the default subvolume of the filesystem
> \fI<path>\fR. The output format
> is similar to \fBsubvolume list\fR command.
> .TP
>
> +\fBsubvolume show\fR\fI <path>\fR
> +Show information of a given subvolume in the \fI<path>\fR.
> +.TP
> +
> \fBfilesystem defragment\fP -c[zlib|lzo] [-l \fIlen\fR] [-s \fIstart\fR] \
> [-t \fIsize\fR] -[vf] <\fIfile\fR>|<\fIdir\fR> [<\fIfile\fR>|<\fIdir\fR>...]
>
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