| Message ID | 20171010083709.30690-1-lufq.fnst@cn.fujitsu.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Tue, Oct 10, 2017 at 04:37:09PM +0800, Lu Fengqi wrote: > Show the absolute subvol path for the associated level-0 qgroup. > > Signed-off-by: Lu Fengqi <lufq.fnst@cn.fujitsu.com> > --- > Documentation/btrfs-qgroup.asciidoc | 2 + > cmds-qgroup.c | 7 +- > qgroup.c | 130 +++++++++++++++++++++++++++++++++--- > qgroup.h | 1 + > 4 files changed, 129 insertions(+), 11 deletions(-) > > diff --git a/Documentation/btrfs-qgroup.asciidoc b/Documentation/btrfs-qgroup.asciidoc > index 3053f2e6..fb48a917 100644 > --- a/Documentation/btrfs-qgroup.asciidoc > +++ b/Documentation/btrfs-qgroup.asciidoc > @@ -93,6 +93,8 @@ Show all qgroups in the btrfs filesystem identified by <path>. > print parent qgroup id. > -c:::: > print child qgroup id. > +-P:::: > +print subvol path. > -r:::: > print limit of referenced size of qgroup. > -e:::: > diff --git a/cmds-qgroup.c b/cmds-qgroup.c > index 38382ea9..9dce84ae 100644 > --- a/cmds-qgroup.c > +++ b/cmds-qgroup.c > @@ -277,6 +277,7 @@ static const char * const cmd_qgroup_show_usage[] = { > "Show subvolume quota groups.", > "-p print parent qgroup id", > "-c print child qgroup id", > + "-P print subvol path", I think the path should be printed by default. A more intelligent way of specifying the columns is on the way, so I'd leave the path without an option. It's printed as a last item so hopefully will not break tools that parse the qgrou show output. > "-r print limit of referenced size of qgroup", > "-e print limit of exclusive size of qgroup", > "-F list all qgroups which impact the given path", > @@ -322,7 +323,7 @@ static int cmd_qgroup_show(int argc, char **argv) > { NULL, 0, NULL, 0 } > }; > > - c = getopt_long(argc, argv, "pcreFf", long_options, NULL); > + c = getopt_long(argc, argv, "pcPreFf", long_options, NULL); > if (c < 0) > break; > switch (c) { > @@ -334,6 +335,10 @@ static int cmd_qgroup_show(int argc, char **argv) > btrfs_qgroup_setup_print_column( > BTRFS_QGROUP_CHILD); > break; > + case 'P': > + btrfs_qgroup_setup_print_column( > + BTRFS_QGROUP_PATH); > + break; > case 'r': > btrfs_qgroup_setup_print_column( > BTRFS_QGROUP_MAX_RFER); > diff --git a/qgroup.c b/qgroup.c > index fffdbb12..d618107e 100644 > --- a/qgroup.c > +++ b/qgroup.c > @@ -62,6 +62,9 @@ struct btrfs_qgroup { > struct list_head qgroups; > /*qgroups that are members of this group*/ > struct list_head members; > + > + /* level-0 qgroup's subvolume path */ > + char *path; > }; > > /* > @@ -133,6 +136,13 @@ static struct { > .unit_mode = 0, > .max_len = 5, > }, > + { > + .name = "path", > + .column_name = "Path", > + .need_print = 0, > + .unit_mode = 0, > + .max_len = 4, > + }, > { > .name = NULL, > .column_name = NULL, > @@ -253,6 +263,9 @@ static void print_qgroup_column(struct btrfs_qgroup *qgroup, > len = print_child_column(qgroup); > print_qgroup_column_add_blank(BTRFS_QGROUP_CHILD, len); > break; > + case BTRFS_QGROUP_PATH: > + len = printf("%s", qgroup->path ? qgroup->path : "---"); > + print_qgroup_column_add_blank(BTRFS_QGROUP_PATH, len); > default: > break; > } > @@ -267,7 +280,7 @@ static void print_single_qgroup_table(struct btrfs_qgroup *qgroup) > continue; > print_qgroup_column(qgroup, i); > > - if (i != BTRFS_QGROUP_CHILD) > + if (i != BTRFS_QGROUP_ALL - 1) > printf(" "); > } > printf("\n"); > @@ -284,7 +297,7 @@ static void print_table_head(void) > if (!btrfs_qgroup_columns[i].need_print) > continue; > if ((i == BTRFS_QGROUP_QGROUPID) | (i == BTRFS_QGROUP_PARENT) | > - (i == BTRFS_QGROUP_CHILD)) > + (i == BTRFS_QGROUP_CHILD) | (i == BTRFS_QGROUP_PATH)) > printf("%-*s", max_len, btrfs_qgroup_columns[i].name); > else > printf("%*s", max_len, btrfs_qgroup_columns[i].name); > @@ -296,7 +309,7 @@ static void print_table_head(void) > if (!btrfs_qgroup_columns[i].need_print) > continue; > if ((i == BTRFS_QGROUP_QGROUPID) | (i == BTRFS_QGROUP_PARENT) | > - (i == BTRFS_QGROUP_CHILD)) { > + (i == BTRFS_QGROUP_CHILD) | (i == BTRFS_QGROUP_PATH)) { > len = strlen(btrfs_qgroup_columns[i].name); > while (len--) > printf("-"); > @@ -627,7 +640,7 @@ static int add_qgroup(struct qgroup_lookup *qgroup_lookup, u64 qgroupid, > u64 generation, u64 rfer, u64 rfer_cmpr, u64 excl, > u64 excl_cmpr, u64 flags, u64 max_rfer, u64 max_excl, > u64 rsv_rfer, u64 rsv_excl, struct btrfs_qgroup *parent, > - struct btrfs_qgroup *child) > + struct btrfs_qgroup *child, char *path) > { > struct btrfs_qgroup *bq; > struct btrfs_qgroup_list *list; > @@ -678,6 +691,8 @@ static int add_qgroup(struct qgroup_lookup *qgroup_lookup, u64 qgroupid, > list_add_tail(&list->next_qgroup, &child->qgroups); > list_add_tail(&list->next_member, &parent->members); > } > + bq->path = path; > + > ret = qgroup_tree_insert(qgroup_lookup, bq); > if (ret) { > error("failed to insert %llu into tree: %s", > @@ -687,6 +702,88 @@ static int add_qgroup(struct qgroup_lookup *qgroup_lookup, u64 qgroupid, > return ret; > } > > +/* > + * Construct subvolume path for level-0 qgroup according to qgroupid. > + * > + * Return a potiner to the path string on success. > + * Return NULL on error or qgroup level > 0. > + */ > +static char *qgroups_path_lookup(int fd, struct qgroup_lookup *qgroup_lookup, > + u64 qgroupid) > +{ > + struct btrfs_ioctl_search_args args; > + struct btrfs_ioctl_search_key *sk = &args.key; > + struct btrfs_root_ref *ref; > + struct btrfs_ioctl_search_header sh; > + struct btrfs_qgroup *bq; > + char *name, *path; > + u64 subvol_id; > + int name_len; > + int ret; > + > + /* construct the path only if need print path */ > + if (!btrfs_qgroup_columns[BTRFS_QGROUP_PATH].need_print) > + return NULL; > + > + /* only level-0 qgroup has the corresponding subvolume*/ > + if (btrfs_qgroup_level(qgroupid)) > + return NULL; > + > + subvol_id = btrfs_qgroup_subvid(qgroupid); > + if (subvol_id < BTRFS_FIRST_FREE_OBJECTID || > + subvol_id > BTRFS_LAST_FREE_OBJECTID) > + return NULL; > + > + memset(&args, 0, sizeof(args)); > + > + sk->tree_id = BTRFS_ROOT_TREE_OBJECTID; > + sk->max_type = BTRFS_ROOT_BACKREF_KEY; > + sk->min_type = BTRFS_ROOT_BACKREF_KEY; > + sk->max_objectid = subvol_id; > + sk->min_objectid = subvol_id; > + sk->max_offset = (u64)-1; > + sk->max_transid = (u64)-1; > + > + sk->nr_items = 4096; > + ret = ioctl(fd, BTRFS_IOC_TREE_SEARCH, &args); > + if (ret < 0) > + return NULL; > + if (!sk->nr_items) > + return NULL; > + > + /* resolve the ROOT_BACKREF to get the subvolume name*/ > + memcpy(&sh, args.buf, sizeof(sh)); > + ref = (struct btrfs_root_ref *)(args.buf + sizeof(sh)); > + name_len = btrfs_stack_root_ref_name_len(ref); > + name = (char *)(ref + 1); > + > + /* > + * directly return subvolume name if top level is the initial subvolume > + */ > + if (sh.offset == BTRFS_FS_TREE_OBJECTID) > + return strndup(name, name_len); > + > + /* > + * construct path based on the upper subvolume path and the subvolume > + * name > + */ > + bq = qgroup_tree_search(qgroup_lookup, sh.offset); > + if (!bq || bq->qgroupid != sh.offset) > + return NULL; > + > + /* > + * 2 means the path delimiter '/' and the terminating null byte ('\0') > + */ > + path = malloc(strlen(name) + strlen(bq->path) + 2); > + if (!path) { > + perror("malloc failed"); > + exit(1); > + } > + sprintf(path, "%s/%s", bq->path, name); > + > + return path; > +} > + > static void __free_btrfs_qgroup(struct btrfs_qgroup *bq) > { > struct btrfs_qgroup_list *list; > @@ -706,6 +803,8 @@ static void __free_btrfs_qgroup(struct btrfs_qgroup *bq) > list_del(&list->next_member); > free(list); > } > + if (bq->path) > + free(bq->path); > free(bq); > } > > @@ -979,6 +1078,11 @@ static void __update_columns_max_len(struct btrfs_qgroup *bq, > if (btrfs_qgroup_columns[column].max_len < len) > btrfs_qgroup_columns[column].max_len = len; > break; > + case BTRFS_QGROUP_PATH: > + len = bq->path ? strlen(bq->path) : 0; > + if (btrfs_qgroup_columns[column].max_len < len) > + btrfs_qgroup_columns[column].max_len = len; > + break; > default: > break; > } > @@ -1092,8 +1196,12 @@ static int __qgroups_search(int fd, struct qgroup_lookup *qgroup_lookup) > print_status_flag_warning(flags); > } else if (btrfs_search_header_type(sh) > == BTRFS_QGROUP_INFO_KEY) { > + u64 qgroupid; > + char *path; > + > info = (struct btrfs_qgroup_info_item *) > (args.buf + off); > + qgroupid = btrfs_search_header_offset(sh); > a1 = btrfs_stack_qgroup_info_generation(info); > a2 = btrfs_stack_qgroup_info_referenced(info); > a3 = > @@ -1103,10 +1211,11 @@ static int __qgroups_search(int fd, struct qgroup_lookup *qgroup_lookup) > a5 = > btrfs_stack_qgroup_info_exclusive_compressed > (info); > - add_qgroup(qgroup_lookup, > - btrfs_search_header_offset(sh), a1, > - a2, a3, a4, a5, 0, 0, 0, 0, 0, NULL, > - NULL); > + path = qgroups_path_lookup(fd, qgroup_lookup, > + qgroupid); > + add_qgroup(qgroup_lookup, qgroupid, a1, a2, a3, > + a4, a5, 0, 0, 0, 0, 0, NULL, NULL, > + path); > } else if (btrfs_search_header_type(sh) > == BTRFS_QGROUP_LIMIT_KEY) { > limit = (struct btrfs_qgroup_limit_item *) > @@ -1124,7 +1233,7 @@ static int __qgroups_search(int fd, struct qgroup_lookup *qgroup_lookup) > add_qgroup(qgroup_lookup, > btrfs_search_header_offset(sh), 0, > 0, 0, 0, 0, a1, a2, a3, a4, a5, > - NULL, NULL); > + NULL, NULL, NULL); > } else if (btrfs_search_header_type(sh) > == BTRFS_QGROUP_RELATION_KEY) { > if (btrfs_search_header_offset(sh) > @@ -1140,7 +1249,8 @@ static int __qgroups_search(int fd, struct qgroup_lookup *qgroup_lookup) > goto skip; > add_qgroup(qgroup_lookup, > btrfs_search_header_offset(sh), 0, > - 0, 0, 0, 0, 0, 0, 0, 0, 0, bq, bq1); > + 0, 0, 0, 0, 0, 0, 0, 0, 0, bq, bq1, > + NULL); Oh no, yet another argument, so it's 15 in total. > } else > goto done; > skip: > diff --git a/qgroup.h b/qgroup.h > index 875fbdf3..2003f834 100644 > --- a/qgroup.h > +++ b/qgroup.h > @@ -59,6 +59,7 @@ enum btrfs_qgroup_column_enum { > BTRFS_QGROUP_MAX_EXCL, > BTRFS_QGROUP_PARENT, > BTRFS_QGROUP_CHILD, > + BTRFS_QGROUP_PATH, > BTRFS_QGROUP_ALL, > }; > > -- > 2.14.2 > > > > -- > To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Mon, Oct 16, 2017 at 08:55:11PM +0200, David Sterba wrote: >On Tue, Oct 10, 2017 at 04:37:09PM +0800, Lu Fengqi wrote: >> Show the absolute subvol path for the associated level-0 qgroup. >> >> Signed-off-by: Lu Fengqi <lufq.fnst@cn.fujitsu.com> >> --- >> Documentation/btrfs-qgroup.asciidoc | 2 + >> cmds-qgroup.c | 7 +- >> qgroup.c | 130 +++++++++++++++++++++++++++++++++--- >> qgroup.h | 1 + >> 4 files changed, 129 insertions(+), 11 deletions(-) >> >> diff --git a/Documentation/btrfs-qgroup.asciidoc b/Documentation/btrfs-qgroup.asciidoc >> index 3053f2e6..fb48a917 100644 >> --- a/Documentation/btrfs-qgroup.asciidoc >> +++ b/Documentation/btrfs-qgroup.asciidoc >> @@ -93,6 +93,8 @@ Show all qgroups in the btrfs filesystem identified by <path>. >> print parent qgroup id. >> -c:::: >> print child qgroup id. >> +-P:::: >> +print subvol path. >> -r:::: >> print limit of referenced size of qgroup. >> -e:::: >> diff --git a/cmds-qgroup.c b/cmds-qgroup.c >> index 38382ea9..9dce84ae 100644 >> --- a/cmds-qgroup.c >> +++ b/cmds-qgroup.c >> @@ -277,6 +277,7 @@ static const char * const cmd_qgroup_show_usage[] = { >> "Show subvolume quota groups.", >> "-p print parent qgroup id", >> "-c print child qgroup id", >> + "-P print subvol path", > >I think the path should be printed by default. A more intelligent way of >specifying the columns is on the way, so I'd leave the path without an >option. It's printed as a last item so hopefully will not break tools >that parse the qgrou show output. OK, I will update the patch so that print the path by default. > >> "-r print limit of referenced size of qgroup", >> "-e print limit of exclusive size of qgroup", >> "-F list all qgroups which impact the given path", >> @@ -322,7 +323,7 @@ static int cmd_qgroup_show(int argc, char **argv) >> { NULL, 0, NULL, 0 } >> }; >> >> - c = getopt_long(argc, argv, "pcreFf", long_options, NULL); >> + c = getopt_long(argc, argv, "pcPreFf", long_options, NULL); >> if (c < 0) >> break; >> switch (c) { >> @@ -334,6 +335,10 @@ static int cmd_qgroup_show(int argc, char **argv) >> btrfs_qgroup_setup_print_column( >> BTRFS_QGROUP_CHILD); >> break; >> + case 'P': >> + btrfs_qgroup_setup_print_column( >> + BTRFS_QGROUP_PATH); >> + break; >> case 'r': >> btrfs_qgroup_setup_print_column( >> BTRFS_QGROUP_MAX_RFER); >> diff --git a/qgroup.c b/qgroup.c >> index fffdbb12..d618107e 100644 >> --- a/qgroup.c >> +++ b/qgroup.c >> @@ -62,6 +62,9 @@ struct btrfs_qgroup { >> struct list_head qgroups; >> /*qgroups that are members of this group*/ >> struct list_head members; >> + >> + /* level-0 qgroup's subvolume path */ >> + char *path; >> }; >> >> /* >> @@ -133,6 +136,13 @@ static struct { >> .unit_mode = 0, >> .max_len = 5, >> }, >> + { >> + .name = "path", >> + .column_name = "Path", >> + .need_print = 0, >> + .unit_mode = 0, >> + .max_len = 4, >> + }, >> { >> .name = NULL, >> .column_name = NULL, >> @@ -253,6 +263,9 @@ static void print_qgroup_column(struct btrfs_qgroup *qgroup, >> len = print_child_column(qgroup); >> print_qgroup_column_add_blank(BTRFS_QGROUP_CHILD, len); >> break; >> + case BTRFS_QGROUP_PATH: >> + len = printf("%s", qgroup->path ? qgroup->path : "---"); >> + print_qgroup_column_add_blank(BTRFS_QGROUP_PATH, len); >> default: >> break; >> } >> @@ -267,7 +280,7 @@ static void print_single_qgroup_table(struct btrfs_qgroup *qgroup) >> continue; >> print_qgroup_column(qgroup, i); >> >> - if (i != BTRFS_QGROUP_CHILD) >> + if (i != BTRFS_QGROUP_ALL - 1) >> printf(" "); >> } >> printf("\n"); >> @@ -284,7 +297,7 @@ static void print_table_head(void) >> if (!btrfs_qgroup_columns[i].need_print) >> continue; >> if ((i == BTRFS_QGROUP_QGROUPID) | (i == BTRFS_QGROUP_PARENT) | >> - (i == BTRFS_QGROUP_CHILD)) >> + (i == BTRFS_QGROUP_CHILD) | (i == BTRFS_QGROUP_PATH)) >> printf("%-*s", max_len, btrfs_qgroup_columns[i].name); >> else >> printf("%*s", max_len, btrfs_qgroup_columns[i].name); >> @@ -296,7 +309,7 @@ static void print_table_head(void) >> if (!btrfs_qgroup_columns[i].need_print) >> continue; >> if ((i == BTRFS_QGROUP_QGROUPID) | (i == BTRFS_QGROUP_PARENT) | >> - (i == BTRFS_QGROUP_CHILD)) { >> + (i == BTRFS_QGROUP_CHILD) | (i == BTRFS_QGROUP_PATH)) { >> len = strlen(btrfs_qgroup_columns[i].name); >> while (len--) >> printf("-"); >> @@ -627,7 +640,7 @@ static int add_qgroup(struct qgroup_lookup *qgroup_lookup, u64 qgroupid, >> u64 generation, u64 rfer, u64 rfer_cmpr, u64 excl, >> u64 excl_cmpr, u64 flags, u64 max_rfer, u64 max_excl, >> u64 rsv_rfer, u64 rsv_excl, struct btrfs_qgroup *parent, >> - struct btrfs_qgroup *child) >> + struct btrfs_qgroup *child, char *path) >> { >> struct btrfs_qgroup *bq; >> struct btrfs_qgroup_list *list; >> @@ -678,6 +691,8 @@ static int add_qgroup(struct qgroup_lookup *qgroup_lookup, u64 qgroupid, >> list_add_tail(&list->next_qgroup, &child->qgroups); >> list_add_tail(&list->next_member, &parent->members); >> } >> + bq->path = path; >> + >> ret = qgroup_tree_insert(qgroup_lookup, bq); >> if (ret) { >> error("failed to insert %llu into tree: %s", >> @@ -687,6 +702,88 @@ static int add_qgroup(struct qgroup_lookup *qgroup_lookup, u64 qgroupid, >> return ret; >> } >> >> +/* >> + * Construct subvolume path for level-0 qgroup according to qgroupid. >> + * >> + * Return a potiner to the path string on success. >> + * Return NULL on error or qgroup level > 0. >> + */ >> +static char *qgroups_path_lookup(int fd, struct qgroup_lookup *qgroup_lookup, >> + u64 qgroupid) >> +{ >> + struct btrfs_ioctl_search_args args; >> + struct btrfs_ioctl_search_key *sk = &args.key; >> + struct btrfs_root_ref *ref; >> + struct btrfs_ioctl_search_header sh; >> + struct btrfs_qgroup *bq; >> + char *name, *path; >> + u64 subvol_id; >> + int name_len; >> + int ret; >> + >> + /* construct the path only if need print path */ >> + if (!btrfs_qgroup_columns[BTRFS_QGROUP_PATH].need_print) >> + return NULL; >> + >> + /* only level-0 qgroup has the corresponding subvolume*/ >> + if (btrfs_qgroup_level(qgroupid)) >> + return NULL; >> + >> + subvol_id = btrfs_qgroup_subvid(qgroupid); >> + if (subvol_id < BTRFS_FIRST_FREE_OBJECTID || >> + subvol_id > BTRFS_LAST_FREE_OBJECTID) >> + return NULL; >> + >> + memset(&args, 0, sizeof(args)); >> + >> + sk->tree_id = BTRFS_ROOT_TREE_OBJECTID; >> + sk->max_type = BTRFS_ROOT_BACKREF_KEY; >> + sk->min_type = BTRFS_ROOT_BACKREF_KEY; >> + sk->max_objectid = subvol_id; >> + sk->min_objectid = subvol_id; >> + sk->max_offset = (u64)-1; >> + sk->max_transid = (u64)-1; >> + >> + sk->nr_items = 4096; >> + ret = ioctl(fd, BTRFS_IOC_TREE_SEARCH, &args); >> + if (ret < 0) >> + return NULL; >> + if (!sk->nr_items) >> + return NULL; >> + >> + /* resolve the ROOT_BACKREF to get the subvolume name*/ >> + memcpy(&sh, args.buf, sizeof(sh)); >> + ref = (struct btrfs_root_ref *)(args.buf + sizeof(sh)); >> + name_len = btrfs_stack_root_ref_name_len(ref); >> + name = (char *)(ref + 1); >> + >> + /* >> + * directly return subvolume name if top level is the initial subvolume >> + */ >> + if (sh.offset == BTRFS_FS_TREE_OBJECTID) >> + return strndup(name, name_len); >> + >> + /* >> + * construct path based on the upper subvolume path and the subvolume >> + * name >> + */ >> + bq = qgroup_tree_search(qgroup_lookup, sh.offset); >> + if (!bq || bq->qgroupid != sh.offset) >> + return NULL; >> + >> + /* >> + * 2 means the path delimiter '/' and the terminating null byte ('\0') >> + */ >> + path = malloc(strlen(name) + strlen(bq->path) + 2); >> + if (!path) { >> + perror("malloc failed"); >> + exit(1); >> + } >> + sprintf(path, "%s/%s", bq->path, name); >> + >> + return path; >> +} >> + >> static void __free_btrfs_qgroup(struct btrfs_qgroup *bq) >> { >> struct btrfs_qgroup_list *list; >> @@ -706,6 +803,8 @@ static void __free_btrfs_qgroup(struct btrfs_qgroup *bq) >> list_del(&list->next_member); >> free(list); >> } >> + if (bq->path) >> + free(bq->path); >> free(bq); >> } >> >> @@ -979,6 +1078,11 @@ static void __update_columns_max_len(struct btrfs_qgroup *bq, >> if (btrfs_qgroup_columns[column].max_len < len) >> btrfs_qgroup_columns[column].max_len = len; >> break; >> + case BTRFS_QGROUP_PATH: >> + len = bq->path ? strlen(bq->path) : 0; >> + if (btrfs_qgroup_columns[column].max_len < len) >> + btrfs_qgroup_columns[column].max_len = len; >> + break; >> default: >> break; >> } >> @@ -1092,8 +1196,12 @@ static int __qgroups_search(int fd, struct qgroup_lookup *qgroup_lookup) >> print_status_flag_warning(flags); >> } else if (btrfs_search_header_type(sh) >> == BTRFS_QGROUP_INFO_KEY) { >> + u64 qgroupid; >> + char *path; >> + >> info = (struct btrfs_qgroup_info_item *) >> (args.buf + off); >> + qgroupid = btrfs_search_header_offset(sh); >> a1 = btrfs_stack_qgroup_info_generation(info); >> a2 = btrfs_stack_qgroup_info_referenced(info); >> a3 = >> @@ -1103,10 +1211,11 @@ static int __qgroups_search(int fd, struct qgroup_lookup *qgroup_lookup) >> a5 = >> btrfs_stack_qgroup_info_exclusive_compressed >> (info); >> - add_qgroup(qgroup_lookup, >> - btrfs_search_header_offset(sh), a1, >> - a2, a3, a4, a5, 0, 0, 0, 0, 0, NULL, >> - NULL); >> + path = qgroups_path_lookup(fd, qgroup_lookup, >> + qgroupid); >> + add_qgroup(qgroup_lookup, qgroupid, a1, a2, a3, >> + a4, a5, 0, 0, 0, 0, 0, NULL, NULL, >> + path); >> } else if (btrfs_search_header_type(sh) >> == BTRFS_QGROUP_LIMIT_KEY) { >> limit = (struct btrfs_qgroup_limit_item *) >> @@ -1124,7 +1233,7 @@ static int __qgroups_search(int fd, struct qgroup_lookup *qgroup_lookup) >> add_qgroup(qgroup_lookup, >> btrfs_search_header_offset(sh), 0, >> 0, 0, 0, 0, a1, a2, a3, a4, a5, >> - NULL, NULL); >> + NULL, NULL, NULL); >> } else if (btrfs_search_header_type(sh) >> == BTRFS_QGROUP_RELATION_KEY) { >> if (btrfs_search_header_offset(sh) >> @@ -1140,7 +1249,8 @@ static int __qgroups_search(int fd, struct qgroup_lookup *qgroup_lookup) >> goto skip; >> add_qgroup(qgroup_lookup, >> btrfs_search_header_offset(sh), 0, >> - 0, 0, 0, 0, 0, 0, 0, 0, 0, bq, bq1); >> + 0, 0, 0, 0, 0, 0, 0, 0, 0, bq, bq1, >> + NULL); > >Oh no, yet another argument, so it's 15 in total. So many arguments are really hard to accept, I will rework this.
On Wed, Oct 18, 2017 at 11:36:21AM +0800, Lu Fengqi wrote: > >> @@ -1140,7 +1249,8 @@ static int __qgroups_search(int fd, struct qgroup_lookup *qgroup_lookup) > >> goto skip; > >> add_qgroup(qgroup_lookup, > >> btrfs_search_header_offset(sh), 0, > >> - 0, 0, 0, 0, 0, 0, 0, 0, 0, bq, bq1); > >> + 0, 0, 0, 0, 0, 0, 0, 0, 0, bq, bq1, > >> + NULL); > > > >Oh no, yet another argument, so it's 15 in total. > > So many arguments are really hard to accept, I will rework this. This could be done independent of this patch, but the cleaning up this area is highly desired. -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/Documentation/btrfs-qgroup.asciidoc b/Documentation/btrfs-qgroup.asciidoc index 3053f2e6..fb48a917 100644 --- a/Documentation/btrfs-qgroup.asciidoc +++ b/Documentation/btrfs-qgroup.asciidoc @@ -93,6 +93,8 @@ Show all qgroups in the btrfs filesystem identified by <path>. print parent qgroup id. -c:::: print child qgroup id. +-P:::: +print subvol path. -r:::: print limit of referenced size of qgroup. -e:::: diff --git a/cmds-qgroup.c b/cmds-qgroup.c index 38382ea9..9dce84ae 100644 --- a/cmds-qgroup.c +++ b/cmds-qgroup.c @@ -277,6 +277,7 @@ static const char * const cmd_qgroup_show_usage[] = { "Show subvolume quota groups.", "-p print parent qgroup id", "-c print child qgroup id", + "-P print subvol path", "-r print limit of referenced size of qgroup", "-e print limit of exclusive size of qgroup", "-F list all qgroups which impact the given path", @@ -322,7 +323,7 @@ static int cmd_qgroup_show(int argc, char **argv) { NULL, 0, NULL, 0 } }; - c = getopt_long(argc, argv, "pcreFf", long_options, NULL); + c = getopt_long(argc, argv, "pcPreFf", long_options, NULL); if (c < 0) break; switch (c) { @@ -334,6 +335,10 @@ static int cmd_qgroup_show(int argc, char **argv) btrfs_qgroup_setup_print_column( BTRFS_QGROUP_CHILD); break; + case 'P': + btrfs_qgroup_setup_print_column( + BTRFS_QGROUP_PATH); + break; case 'r': btrfs_qgroup_setup_print_column( BTRFS_QGROUP_MAX_RFER); diff --git a/qgroup.c b/qgroup.c index fffdbb12..d618107e 100644 --- a/qgroup.c +++ b/qgroup.c @@ -62,6 +62,9 @@ struct btrfs_qgroup { struct list_head qgroups; /*qgroups that are members of this group*/ struct list_head members; + + /* level-0 qgroup's subvolume path */ + char *path; }; /* @@ -133,6 +136,13 @@ static struct { .unit_mode = 0, .max_len = 5, }, + { + .name = "path", + .column_name = "Path", + .need_print = 0, + .unit_mode = 0, + .max_len = 4, + }, { .name = NULL, .column_name = NULL, @@ -253,6 +263,9 @@ static void print_qgroup_column(struct btrfs_qgroup *qgroup, len = print_child_column(qgroup); print_qgroup_column_add_blank(BTRFS_QGROUP_CHILD, len); break; + case BTRFS_QGROUP_PATH: + len = printf("%s", qgroup->path ? qgroup->path : "---"); + print_qgroup_column_add_blank(BTRFS_QGROUP_PATH, len); default: break; } @@ -267,7 +280,7 @@ static void print_single_qgroup_table(struct btrfs_qgroup *qgroup) continue; print_qgroup_column(qgroup, i); - if (i != BTRFS_QGROUP_CHILD) + if (i != BTRFS_QGROUP_ALL - 1) printf(" "); } printf("\n"); @@ -284,7 +297,7 @@ static void print_table_head(void) if (!btrfs_qgroup_columns[i].need_print) continue; if ((i == BTRFS_QGROUP_QGROUPID) | (i == BTRFS_QGROUP_PARENT) | - (i == BTRFS_QGROUP_CHILD)) + (i == BTRFS_QGROUP_CHILD) | (i == BTRFS_QGROUP_PATH)) printf("%-*s", max_len, btrfs_qgroup_columns[i].name); else printf("%*s", max_len, btrfs_qgroup_columns[i].name); @@ -296,7 +309,7 @@ static void print_table_head(void) if (!btrfs_qgroup_columns[i].need_print) continue; if ((i == BTRFS_QGROUP_QGROUPID) | (i == BTRFS_QGROUP_PARENT) | - (i == BTRFS_QGROUP_CHILD)) { + (i == BTRFS_QGROUP_CHILD) | (i == BTRFS_QGROUP_PATH)) { len = strlen(btrfs_qgroup_columns[i].name); while (len--) printf("-"); @@ -627,7 +640,7 @@ static int add_qgroup(struct qgroup_lookup *qgroup_lookup, u64 qgroupid, u64 generation, u64 rfer, u64 rfer_cmpr, u64 excl, u64 excl_cmpr, u64 flags, u64 max_rfer, u64 max_excl, u64 rsv_rfer, u64 rsv_excl, struct btrfs_qgroup *parent, - struct btrfs_qgroup *child) + struct btrfs_qgroup *child, char *path) { struct btrfs_qgroup *bq; struct btrfs_qgroup_list *list; @@ -678,6 +691,8 @@ static int add_qgroup(struct qgroup_lookup *qgroup_lookup, u64 qgroupid, list_add_tail(&list->next_qgroup, &child->qgroups); list_add_tail(&list->next_member, &parent->members); } + bq->path = path; + ret = qgroup_tree_insert(qgroup_lookup, bq); if (ret) { error("failed to insert %llu into tree: %s", @@ -687,6 +702,88 @@ static int add_qgroup(struct qgroup_lookup *qgroup_lookup, u64 qgroupid, return ret; } +/* + * Construct subvolume path for level-0 qgroup according to qgroupid. + * + * Return a potiner to the path string on success. + * Return NULL on error or qgroup level > 0. + */ +static char *qgroups_path_lookup(int fd, struct qgroup_lookup *qgroup_lookup, + u64 qgroupid) +{ + struct btrfs_ioctl_search_args args; + struct btrfs_ioctl_search_key *sk = &args.key; + struct btrfs_root_ref *ref; + struct btrfs_ioctl_search_header sh; + struct btrfs_qgroup *bq; + char *name, *path; + u64 subvol_id; + int name_len; + int ret; + + /* construct the path only if need print path */ + if (!btrfs_qgroup_columns[BTRFS_QGROUP_PATH].need_print) + return NULL; + + /* only level-0 qgroup has the corresponding subvolume*/ + if (btrfs_qgroup_level(qgroupid)) + return NULL; + + subvol_id = btrfs_qgroup_subvid(qgroupid); + if (subvol_id < BTRFS_FIRST_FREE_OBJECTID || + subvol_id > BTRFS_LAST_FREE_OBJECTID) + return NULL; + + memset(&args, 0, sizeof(args)); + + sk->tree_id = BTRFS_ROOT_TREE_OBJECTID; + sk->max_type = BTRFS_ROOT_BACKREF_KEY; + sk->min_type = BTRFS_ROOT_BACKREF_KEY; + sk->max_objectid = subvol_id; + sk->min_objectid = subvol_id; + sk->max_offset = (u64)-1; + sk->max_transid = (u64)-1; + + sk->nr_items = 4096; + ret = ioctl(fd, BTRFS_IOC_TREE_SEARCH, &args); + if (ret < 0) + return NULL; + if (!sk->nr_items) + return NULL; + + /* resolve the ROOT_BACKREF to get the subvolume name*/ + memcpy(&sh, args.buf, sizeof(sh)); + ref = (struct btrfs_root_ref *)(args.buf + sizeof(sh)); + name_len = btrfs_stack_root_ref_name_len(ref); + name = (char *)(ref + 1); + + /* + * directly return subvolume name if top level is the initial subvolume + */ + if (sh.offset == BTRFS_FS_TREE_OBJECTID) + return strndup(name, name_len); + + /* + * construct path based on the upper subvolume path and the subvolume + * name + */ + bq = qgroup_tree_search(qgroup_lookup, sh.offset); + if (!bq || bq->qgroupid != sh.offset) + return NULL; + + /* + * 2 means the path delimiter '/' and the terminating null byte ('\0') + */ + path = malloc(strlen(name) + strlen(bq->path) + 2); + if (!path) { + perror("malloc failed"); + exit(1); + } + sprintf(path, "%s/%s", bq->path, name); + + return path; +} + static void __free_btrfs_qgroup(struct btrfs_qgroup *bq) { struct btrfs_qgroup_list *list; @@ -706,6 +803,8 @@ static void __free_btrfs_qgroup(struct btrfs_qgroup *bq) list_del(&list->next_member); free(list); } + if (bq->path) + free(bq->path); free(bq); } @@ -979,6 +1078,11 @@ static void __update_columns_max_len(struct btrfs_qgroup *bq, if (btrfs_qgroup_columns[column].max_len < len) btrfs_qgroup_columns[column].max_len = len; break; + case BTRFS_QGROUP_PATH: + len = bq->path ? strlen(bq->path) : 0; + if (btrfs_qgroup_columns[column].max_len < len) + btrfs_qgroup_columns[column].max_len = len; + break; default: break; } @@ -1092,8 +1196,12 @@ static int __qgroups_search(int fd, struct qgroup_lookup *qgroup_lookup) print_status_flag_warning(flags); } else if (btrfs_search_header_type(sh) == BTRFS_QGROUP_INFO_KEY) { + u64 qgroupid; + char *path; + info = (struct btrfs_qgroup_info_item *) (args.buf + off); + qgroupid = btrfs_search_header_offset(sh); a1 = btrfs_stack_qgroup_info_generation(info); a2 = btrfs_stack_qgroup_info_referenced(info); a3 = @@ -1103,10 +1211,11 @@ static int __qgroups_search(int fd, struct qgroup_lookup *qgroup_lookup) a5 = btrfs_stack_qgroup_info_exclusive_compressed (info); - add_qgroup(qgroup_lookup, - btrfs_search_header_offset(sh), a1, - a2, a3, a4, a5, 0, 0, 0, 0, 0, NULL, - NULL); + path = qgroups_path_lookup(fd, qgroup_lookup, + qgroupid); + add_qgroup(qgroup_lookup, qgroupid, a1, a2, a3, + a4, a5, 0, 0, 0, 0, 0, NULL, NULL, + path); } else if (btrfs_search_header_type(sh) == BTRFS_QGROUP_LIMIT_KEY) { limit = (struct btrfs_qgroup_limit_item *) @@ -1124,7 +1233,7 @@ static int __qgroups_search(int fd, struct qgroup_lookup *qgroup_lookup) add_qgroup(qgroup_lookup, btrfs_search_header_offset(sh), 0, 0, 0, 0, 0, a1, a2, a3, a4, a5, - NULL, NULL); + NULL, NULL, NULL); } else if (btrfs_search_header_type(sh) == BTRFS_QGROUP_RELATION_KEY) { if (btrfs_search_header_offset(sh) @@ -1140,7 +1249,8 @@ static int __qgroups_search(int fd, struct qgroup_lookup *qgroup_lookup) goto skip; add_qgroup(qgroup_lookup, btrfs_search_header_offset(sh), 0, - 0, 0, 0, 0, 0, 0, 0, 0, 0, bq, bq1); + 0, 0, 0, 0, 0, 0, 0, 0, 0, bq, bq1, + NULL); } else goto done; skip: diff --git a/qgroup.h b/qgroup.h index 875fbdf3..2003f834 100644 --- a/qgroup.h +++ b/qgroup.h @@ -59,6 +59,7 @@ enum btrfs_qgroup_column_enum { BTRFS_QGROUP_MAX_EXCL, BTRFS_QGROUP_PARENT, BTRFS_QGROUP_CHILD, + BTRFS_QGROUP_PATH, BTRFS_QGROUP_ALL, };
Show the absolute subvol path for the associated level-0 qgroup. Signed-off-by: Lu Fengqi <lufq.fnst@cn.fujitsu.com> --- Documentation/btrfs-qgroup.asciidoc | 2 + cmds-qgroup.c | 7 +- qgroup.c | 130 +++++++++++++++++++++++++++++++++--- qgroup.h | 1 + 4 files changed, 129 insertions(+), 11 deletions(-)