Add linux kernel disk support

Native Linux vdev disk interfaces

Signed-off-by: Brian Behlendorf <[email protected]>

2 files changed, 36 insertions, 7 deletions

diff --git a/module/zcommon/include/sys/fs/zfs.h b/module/zcommon/include/sys/fs/zfs.h
index b2c946919..25f256251 100644
--- a/module/zcommon/include/sys/fs/zfs.h
+++ b/module/zcommon/include/sys/fs/zfs.h
@@ -701,12 +701,12 @@ typedef struct ddt_histogram {
 #define	ZFS_DEV		"/dev/zfs"
 
 /* general zvol path */
-#define	ZVOL_DIR		"/dev/zvol"
-/* expansion */
-#define	ZVOL_PSEUDO_DEV		"/devices/pseudo/zfs@0:"
-/* for dump and swap */
-#define	ZVOL_FULL_DEV_DIR	ZVOL_DIR "/dsk/"
-#define	ZVOL_FULL_RDEV_DIR	ZVOL_DIR "/rdsk/"
+#define	ZVOL_DIR	"/dev"
+
+#define	ZVOL_MAJOR		230
+#define	ZVOL_MINOR_BITS		4
+#define	ZVOL_MINOR_MASK		((1U << ZVOL_MINOR_BITS) - 1)
+#define	ZVOL_MINORS		(1 << 4)
 
 #define	ZVOL_PROP_NAME		"name"
 #define	ZVOL_DEFAULT_BLOCKSIZE	8192
@@ -740,6 +740,8 @@ typedef enum zfs_ioc {
 	ZFS_IOC_DATASET_LIST_NEXT,
 	ZFS_IOC_SNAPSHOT_LIST_NEXT,
 	ZFS_IOC_SET_PROP,
+	ZFS_IOC_CREATE_MINOR,
+	ZFS_IOC_REMOVE_MINOR,
 	ZFS_IOC_CREATE,
 	ZFS_IOC_DESTROY,
 	ZFS_IOC_ROLLBACK,
diff --git a/module/zcommon/zfs_namecheck.c b/module/zcommon/zfs_namecheck.c
index 5cfafea47..2398c2755 100644
--- a/module/zcommon/zfs_namecheck.c
+++ b/module/zcommon/zfs_namecheck.c
@@ -142,9 +142,22 @@ dataset_namecheck(const char *path, namecheck_err_t *why, char *what)
 	 * which is the same as MAXNAMELEN used in the kernel.
 	 * If ZFS_MAXNAMELEN value is changed, make sure to cleanup all
 	 * places using MAXNAMELEN.
+	 *
+	 * When HAVE_KOBJ_NAME_LEN is defined the maximum safe kobject name
+	 * length is 20 bytes.  This 20 bytes is broken down as follows to
+	 * provide a maximum safe <pool>/<dataset>[@snapshot] length of only
+	 * 18 bytes.  To ensure bytes are left for <dataset>[@snapshot] the
+	 * <pool> portition is futher limited to 9 bytes.  For 2.6.27 and
+	 * newer kernels this limit is set to MAXNAMELEN.
+	 *
+	 *   <pool>/<dataset> + <partition> + <newline>
+	 *   (18)             + (1)         + (1)
 	 */
-
+#ifdef HAVE_KOBJ_NAME_LEN
+	if (strlen(path) > 18) {
+#else
 	if (strlen(path) >= MAXNAMELEN) {
+#endif /* HAVE_KOBJ_NAME_LEN */
 		if (why)
 			*why = NAME_ERR_TOOLONG;
 		return (-1);
@@ -303,8 +316,22 @@ pool_namecheck(const char *pool, namecheck_err_t *why, char *what)
 	 * which is the same as MAXNAMELEN used in the kernel.
 	 * If ZPOOL_MAXNAMELEN value is changed, make sure to cleanup all
 	 * places using MAXNAMELEN.
+	 *
+	 * When HAVE_KOBJ_NAME_LEN is defined the maximum safe kobject name
+	 * length is 20 bytes.  This 20 bytes is broken down as follows to
+	 * provide a maximum safe <pool>/<dataset>[@snapshot] length of only
+	 * 18 bytes.  To ensure bytes are left for <dataset>[@snapshot] the
+	 * <pool> portition is futher limited to 8 bytes.  For 2.6.27 and
+	 * newer kernels this limit is set to MAXNAMELEN.
+	 *
+	 *   <pool>/<dataset> + <partition> + <newline>
+	 *   (18)             + (1)         + (1)
 	 */
+#ifdef HAVE_KOBJ_NAME_LEN
+	if (strlen(pool) > 8) {
+#else
 	if (strlen(pool) >= MAXNAMELEN) {
+#endif /* HAVE_KOBJ_NAME_LEN */
 		if (why)
 			*why = NAME_ERR_TOOLONG;
 		return (-1);