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samples/vfs: add STATMOUNT_MNT_{G,U}IDMAP

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Illustrate how to use STATMOUNT_MNT_{G,U}IDMAP.

Link: https://lore.kernel.org/r/20250204-work-mnt_idmap-statmount-v2-4-007720f39f2e@kernel.org
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Christian Brauner 2025-02-04 12:27:49 +01:00
parent a496dfecbc
commit fa204a65f1
No known key found for this signature in database
GPG Key ID: 91C61BC06578DCA2
2 changed files with 37 additions and 3 deletions
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14
samples/vfs/samples-vfs.h
View File

@ -42,7 +42,11 @@ struct statmount {
__u32 opt_array; /* [str] Array of nul terminated fs options */
__u32 opt_sec_num; /* Number of security options */
__u32 opt_sec_array; /* [str] Array of nul terminated security options */
__u64 __spare2[46];
__u32 mnt_uidmap_num; /* Number of uid mappings */
__u32 mnt_uidmap; /* [str] Array of uid mappings */
__u32 mnt_gidmap_num; /* Number of gid mappings */
__u32 mnt_gidmap; /* [str] Array of gid mappings */
__u64 __spare2[44];
char str[]; /* Variable size part containing strings */
};
@ -158,6 +162,14 @@ struct mnt_ns_info {
#define STATX_MNT_ID_UNIQUE 0x00004000U /* Want/got extended stx_mount_id */
#endif
#ifndef STATMOUNT_MNT_UIDMAP
#define STATMOUNT_MNT_UIDMAP 0x00002000U /* Want/got uidmap... */
#endif
#ifndef STATMOUNT_MNT_GIDMAP
#define STATMOUNT_MNT_GIDMAP 0x00004000U /* Want/got gidmap... */
#endif
#ifndef MOUNT_ATTR_RDONLY
#define MOUNT_ATTR_RDONLY 0x00000001 /* Mount read-only */
#endif

26
samples/vfs/test-list-all-mounts.c
View File

@ -128,14 +128,16 @@ int main(int argc, char *argv[])
STATMOUNT_MNT_POINT |
STATMOUNT_MNT_NS_ID |
STATMOUNT_MNT_OPTS |
STATMOUNT_FS_TYPE, 0);
STATMOUNT_FS_TYPE |
STATMOUNT_MNT_UIDMAP |
STATMOUNT_MNT_GIDMAP, 0);
if (!stmnt) {
printf("Failed to statmount(%" PRIu64 ") in mount namespace(%" PRIu64 ")\n",
(uint64_t)last_mnt_id, (uint64_t)info.mnt_ns_id);
continue;
}
printf("mnt_id:\t\t%" PRIu64 "\nmnt_parent_id:\t%" PRIu64 "\nfs_type:\t%s\nmnt_root:\t%s\nmnt_point:\t%s\nmnt_opts:\t%s\n\n",
printf("mnt_id:\t\t%" PRIu64 "\nmnt_parent_id:\t%" PRIu64 "\nfs_type:\t%s\nmnt_root:\t%s\nmnt_point:\t%s\nmnt_opts:\t%s\n",
(uint64_t)stmnt->mnt_id,
(uint64_t)stmnt->mnt_parent_id,
(stmnt->mask & STATMOUNT_FS_TYPE) ? stmnt->str + stmnt->fs_type : "",
@ -143,6 +145,26 @@ int main(int argc, char *argv[])
(stmnt->mask & STATMOUNT_MNT_POINT) ? stmnt->str + stmnt->mnt_point : "",
(stmnt->mask & STATMOUNT_MNT_OPTS) ? stmnt->str + stmnt->mnt_opts : "");
if (stmnt->mask & STATMOUNT_MNT_UIDMAP) {
const char *idmap = stmnt->str + stmnt->mnt_uidmap;
for (size_t idx = 0; idx < stmnt->mnt_uidmap_num; idx++) {
printf("mnt_uidmap[%lu]:\t%s\n", idx, idmap);
idmap += strlen(idmap) + 1;
}
}
if (stmnt->mask & STATMOUNT_MNT_GIDMAP) {
const char *idmap = stmnt->str + stmnt->mnt_gidmap;
for (size_t idx = 0; idx < stmnt->mnt_gidmap_num; idx++) {
printf("mnt_gidmap[%lu]:\t%s\n", idx, idmap);
idmap += strlen(idmap) + 1;
}
}
printf("\n");
free(stmnt);
}
}