Some weird old filesytems have UUID-like things that we wish to expose
as UUIDs, but are smaller; add a length field so that the new
FS_IOC_(GET|SET)UUID ioctls can handle them in generic code.
And add a helper super_set_uuid(), for setting nonstandard length uuids.
Helper is now required for the new FS_IOC_GETUUID ioctl; if
super_set_uuid() hasn't been called, the ioctl won't be supported.
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
Link: https://lore.kernel.org/r/20240207025624.1019754-2-kent.overstreet@linux.dev
Signed-off-by: Christian Brauner <brauner@kernel.org>
sb->s_qcop = &ext4_qctl_operations;
sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP | QTYPE_MASK_PRJ;
#endif
- memcpy(&sb->s_uuid, es->s_uuid, sizeof(es->s_uuid));
+ super_set_uuid(sb, es->s_uuid, sizeof(es->s_uuid));
INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
mutex_init(&sbi->s_orphan_lock);
sb->s_time_gran = 1;
sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
(test_opt(sbi, POSIX_ACL) ? SB_POSIXACL : 0);
- memcpy(&sb->s_uuid, raw_super->uuid, sizeof(raw_super->uuid));
+ super_set_uuid(sb, (void *) raw_super->uuid, sizeof(raw_super->uuid));
sb->s_iflags |= SB_I_CGROUPWB;
/* init f2fs-specific super block info */
memcpy(sb->sb_lockproto, str->sb_lockproto, GFS2_LOCKNAME_LEN);
memcpy(sb->sb_locktable, str->sb_locktable, GFS2_LOCKNAME_LEN);
- memcpy(&s->s_uuid, str->sb_uuid, 16);
+ super_set_uuid(s, str->sb_uuid, 16);
}
/**
}
sb->s_flags |= SB_ACTIVE;
- uuid_gen(&sb->s_uuid);
+ uuid_t uuid;
+ uuid_gen(&uuid);
+ super_set_uuid(sb, uuid.b, sizeof(uuid));
down_write(&root->kernfs_supers_rwsem);
list_add(&info->node, &info->root->supers);
cbits = le32_to_cpu(di->id2.i_super.s_clustersize_bits);
bbits = le32_to_cpu(di->id2.i_super.s_blocksize_bits);
sb->s_maxbytes = ocfs2_max_file_offset(bbits, cbits);
- memcpy(&sb->s_uuid, di->id2.i_super.s_uuid,
- sizeof(di->id2.i_super.s_uuid));
+ super_set_uuid(sb, di->id2.i_super.s_uuid,
+ sizeof(di->id2.i_super.s_uuid));
osb->osb_dx_mask = (1 << (cbits - bbits)) - 1;
goto out_umount;
}
- import_uuid(&sb->s_uuid, c->uuid);
+ super_set_uuid(sb, c->uuid, sizeof(c->uuid));
mutex_unlock(&c->umount_mutex);
return 0;
int hole, i;
/* Publish UUID in struct super_block */
- uuid_copy(&mp->m_super->s_uuid, uuid);
+ super_set_uuid(mp->m_super, uuid->b, sizeof(*uuid));
if (xfs_has_nouuid(mp))
return 0;
char s_id[32]; /* Informational name */
uuid_t s_uuid; /* UUID */
+ u8 s_uuid_len; /* Default 16, possibly smaller for weird filesystems */
unsigned int s_max_links;
int super_setup_bdi_name(struct super_block *sb, char *fmt, ...);
extern int super_setup_bdi(struct super_block *sb);
+static inline void super_set_uuid(struct super_block *sb, const u8 *uuid, unsigned len)
+{
+ if (WARN_ON(len > sizeof(sb->s_uuid)))
+ len = sizeof(sb->s_uuid);
+ sb->s_uuid_len = len;
+ memcpy(&sb->s_uuid, uuid, len);
+}
+
extern int current_umask(void);
extern void ihold(struct inode * inode);
#ifdef CONFIG_TMPFS_POSIX_ACL
sb->s_flags |= SB_POSIXACL;
#endif
- uuid_gen(&sb->s_uuid);
+ uuid_t uuid;
+ uuid_gen(&uuid);
+ super_set_uuid(sb, uuid.b, sizeof(uuid));
#ifdef CONFIG_TMPFS_QUOTA
if (ctx->seen & SHMEM_SEEN_QUOTA) {