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 <***@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 */
+ 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>...]
--
1.8.1.227.g44fe835
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