Create arrays via metadata-update

[thirdparty/mdadm.git] / mdadm.h

diff --git a/mdadm.h b/mdadm.h
index 97569fad0711dd5d5fddbf1fb3ccd5b7c841f072..5e2cfe41c1fc3eeb493c7c65c642dba000f5a3fe 100644 (file)
--- a/mdadm.h
+++ b/mdadm.h
@@ -348,6 +348,7 @@ extern int sysfs_set_array(struct mdinfo *sra,
 extern int sysfs_add_disk(struct mdinfo *sra, struct mdinfo *sd);
 extern int sysfs_disk_to_sg(int fd);
 extern int sysfs_disk_to_scsi_id(int fd, __u32 *id);
+extern int sysfs_unique_holder(int devnum, long rdev);
 
 
 extern int save_stripes(int *source, unsigned long long *offsets,
@@ -429,10 +430,12 @@ extern struct superswitch {
         * The determination is made either by:
         *   load_super being given a 'component' string.
         *   validate_geometry determining what to create.
-        * getinfo_super_n really needs to be removed..
+        * The info includes both array information and device information.
+        * The particular device should be:
+        *   The last device added by add_to_super
+        *   The device the metadata was loaded from by load_super
         */
        void (*getinfo_super)(struct supertype *st, struct mdinfo *info);
-       void (*getinfo_super_n)(struct supertype *st, struct mdinfo *info);
 
        /* Check if the given metadata is flagged as belonging to "this"
         * host.  For arrays that don't determine a minor-number, this
@@ -499,6 +502,15 @@ extern struct superswitch {
        void (*locate_bitmap)(struct supertype *st, int fd);
        int (*write_bitmap)(struct supertype *st, int fd);
        void (*free_super)(struct supertype *st);
+
+       /* validate_geometry is called with an st returned by
+        * match_metadata_desc.
+        * It should check that the geometry described in compatible with
+        * the metadata type.  It will be called repeatedly as devices
+        * added to validate changing size and new devices.  If there are
+        * inter-device dependencies, it should record sufficient details
+        * so these can be validated.
+        */
        int (*validate_geometry)(struct supertype *st, int level, int layout,
                                 int raiddisks,
                                 int chunk, unsigned long long size,
@@ -530,6 +542,8 @@ extern struct superswitch {
        void (*sync_metadata)(struct supertype *st);
        void (*process_update)(struct supertype *st,
                               struct metadata_update *update);
+       void (*prepare_update)(struct supertype *st,
+                              struct metadata_update *update);
 
        /* activate_spare will check if the array is degraded and, if it
         * is, try to find some spare space in the container.
@@ -547,6 +561,13 @@ extern struct superswitch {
 
 extern struct superswitch super_imsm;
 
+struct metadata_update {
+       int     len;
+       char    *buf;
+       void    *space; /* allocated space that monitor will use */
+       struct metadata_update *next;
+};
+
 /* A supertype holds a particular collection of metadata.
  * It identifies the metadata type by the superswitch, and the particular
  * sub-version of that metadata type.
@@ -563,14 +584,16 @@ struct supertype {
        int minor_version;
        int max_devs;
        int container_dev;    /* devnum of container */
+       char subarray[32];      /* name of array inside container */
        void *sb;
        void *info;
 
+       struct metadata_update *updates;
+       struct metadata_update **update_tail;
+
        /* extra stuff used by mdmon */
        struct active_array *arrays;
        int sock; /* listen to external programs */
-       int mgr_pipe[2]; /* communicate between threads */
-       int mon_pipe[2]; /* communicate between threads */
        int devnum;
        char *devname; /* e.g. md0.  This appears in metadata_verison:
                        *  external:/md0/12
@@ -582,7 +605,6 @@ struct supertype {
 
 };
 
-extern struct supertype supertype_container_member;
 extern struct supertype *super_by_fd(int fd);
 extern struct supertype *guess_super(int fd);
 extern struct supertype *dup_super(struct supertype *st);
@@ -728,6 +750,8 @@ extern unsigned long long get_component_size(int fd);
 extern void remove_partitions(int fd);
 extern unsigned long long calc_array_size(int level, int raid_disks, int layout,
                                   int chunksize, unsigned long long devsize);
+extern int flush_metadata_updates(struct supertype *st);
+extern void append_metadata_update(struct supertype *st, void *buf, int len);
 
 
 extern char *human_size(long long bytes);