#define LCFG_HDR_SIZE(count) \
cfs_size_round(offsetof (struct lustre_cfg, lcfg_buflens[(count)]))
-/* If the LCFG_REQUIRED bit is set in a configuration command,
+/** If the LCFG_REQUIRED bit is set in a configuration command,
* then the client is required to understand this parameter
* in order to mount the filesystem. If it does not understand
* a REQUIRED command the client mount will fail. */
#define LCFG_REQUIRED 0x0001000
enum lcfg_command_type {
- LCFG_ATTACH = 0x00cf001,
- LCFG_DETACH = 0x00cf002,
- LCFG_SETUP = 0x00cf003,
- LCFG_CLEANUP = 0x00cf004,
- LCFG_ADD_UUID = 0x00cf005,
- LCFG_DEL_UUID = 0x00cf006,
- LCFG_MOUNTOPT = 0x00cf007,
- LCFG_DEL_MOUNTOPT = 0x00cf008,
- LCFG_SET_TIMEOUT = 0x00cf009,
- LCFG_SET_UPCALL = 0x00cf00a,
- LCFG_ADD_CONN = 0x00cf00b,
- LCFG_DEL_CONN = 0x00cf00c,
- LCFG_LOV_ADD_OBD = 0x00cf00d,
- LCFG_LOV_DEL_OBD = 0x00cf00e,
- LCFG_PARAM = 0x00cf00f,
- LCFG_MARKER = 0x00cf010,
- LCFG_LOG_START = 0x00ce011,
- LCFG_LOG_END = 0x00ce012,
- LCFG_LOV_ADD_INA = 0x00ce013,
- LCFG_ADD_MDC = 0x00cf014,
- LCFG_DEL_MDC = 0x00cf015,
- LCFG_SPTLRPC_CONF = 0x00ce016,
- LCFG_POOL_NEW = 0x00ce020,
- LCFG_POOL_ADD = 0x00ce021,
- LCFG_POOL_REM = 0x00ce022,
- LCFG_POOL_DEL = 0x00ce023,
- LCFG_SET_LDLM_TIMEOUT = 0x00ce030,
+ LCFG_ATTACH = 0x00cf001, /**< create a new obd instance */
+ LCFG_DETACH = 0x00cf002, /**< destroy obd instance */
+ LCFG_SETUP = 0x00cf003, /**< call type-specific setup */
+ LCFG_CLEANUP = 0x00cf004, /**< call type-specific cleanup */
+ LCFG_ADD_UUID = 0x00cf005, /**< add a nid to a niduuid */
+ LCFG_DEL_UUID = 0x00cf006, /**< remove a nid from a niduuid */
+ LCFG_MOUNTOPT = 0x00cf007, /**< create a profile (mdc, osc) */
+ LCFG_DEL_MOUNTOPT = 0x00cf008, /**< destroy a profile */
+ LCFG_SET_TIMEOUT = 0x00cf009, /**< set obd_timeout */
+ LCFG_SET_UPCALL = 0x00cf00a, /**< deprecated */
+ LCFG_ADD_CONN = 0x00cf00b, /**< add a failover niduuid to an obd */
+ LCFG_DEL_CONN = 0x00cf00c, /**< remove a failover niduuid */
+ LCFG_LOV_ADD_OBD = 0x00cf00d, /**< add an osc to a lov */
+ LCFG_LOV_DEL_OBD = 0x00cf00e, /**< remove an osc from a lov */
+ LCFG_PARAM = 0x00cf00f, /**< set a proc parameter */
+ LCFG_MARKER = 0x00cf010, /**< metadata about next cfg rec */
+ LCFG_LOG_START = 0x00ce011, /**< mgc only, process a cfg log */
+ LCFG_LOG_END = 0x00ce012, /**< stop processing updates */
+ LCFG_LOV_ADD_INA = 0x00ce013, /**< like LOV_ADD_OBD, inactive */
+ LCFG_ADD_MDC = 0x00cf014, /**< add an mdc to a lmv */
+ LCFG_DEL_MDC = 0x00cf015, /**< remove an mdc from a lmv */
+ LCFG_SPTLRPC_CONF = 0x00ce016, /**< security */
+ LCFG_POOL_NEW = 0x00ce020, /**< create an ost pool name */
+ LCFG_POOL_ADD = 0x00ce021, /**< add an ost to a pool */
+ LCFG_POOL_REM = 0x00ce022, /**< remove an ost from a pool */
+ LCFG_POOL_DEL = 0x00ce023, /**< destroy an ost pool name */
+ LCFG_SET_LDLM_TIMEOUT = 0x00ce030, /**< set ldlm_timeout */
};
struct lustre_cfg_bufs {
RETURN(uuid);
}
+/** Create a new /a exp on device /a obd for the uuid /a cluuid
+ * @param exp New export handle
+ * @param d Connect data, supported flags are set, flags also understood
+ * by obd are returned.
+ */
static inline int obd_connect(const struct lu_env *env,
struct obd_export **exp,struct obd_device *obd,
struct obd_uuid *cluuid,
GOTO(out_free, err);
}
+ /* Profile set with LCFG_MOUNTOPT so we can find our mdc and osc obds */
lprof = class_get_profile(profilenm);
if (lprof == NULL) {
LCONSOLE_ERROR_MSG(0x156, "The client profile '%s' could not be"
RETURN(cld);
}
-/**
- * Add this log to our list of active logs.
+/** Add this log to the list of active logs watched by an MGC.
+ * Active means we're watching for updates.
* We have one active log per "mount" - client instance or servername.
* Each instance may be at a different point in the log.
*/
CFS_DECLARE_MUTEX(llog_process_lock);
-/* Stop watching for updates on this log. */
+/** Stop watching for updates on this log.
+ */
static int config_log_end(char *logname, struct config_llog_instance *cfg)
{
struct config_llog_data *cld, *cld_sptlrpc = NULL;
RETURN(rc);
}
-/* Get a config log from the MGS and process it.
- This func is called for both clients and servers. */
+/** Get a config log from the MGS and process it.
+ * This func is called for both clients and servers.
+ * Copy the log locally before parsing it if appropriate (non-MGS server)
+ */
int mgc_process_log(struct obd_device *mgc,
struct config_llog_data *cld)
{
RETURN(rc);
}
+/** Called from lustre_process_log.
+ * LCFG_LOG_START gets the config log from the MGS, processes it to start
+ * any services, and adds it to the list logs to watch (follow).
+ */
static int mgc_process_config(struct obd_device *obd, obd_count len, void *buf)
{
struct lustre_cfg *lcfg = buf;
switch(cmd = lcfg->lcfg_command) {
case LCFG_LOV_ADD_OBD: {
- /* Add any new target, not just osts */
+ /* Overloading this cfg command: register a new target */
struct mgs_target_info *mti;
if (LUSTRE_CFG_BUFLEN(lcfg, 1) !=
break;
}
case LCFG_LOV_DEL_OBD:
- /* Remove target from the fs? */
- /* FIXME */
+ /* Unregister has no meaning at the moment. */
CERROR("lov_del_obd unimplemented\n");
rc = -ENOSYS;
break;
/********************** class fns **********************/
/**
- * Create a new device and set the type, name and uuid. If successful, the new
- * device can be accessed by either name or uuid.
+ * Create a new obd device and set the type, name and uuid. If successful,
+ * the new device can be accessed by either name or uuid.
*/
int class_attach(struct lustre_cfg *lcfg)
{
return rc;
}
+/** Create hashes, self-export, and call type-specific setup.
+ * Setup is effectively the "start this obd" call.
+ */
int class_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
{
int err = 0;
return err;
}
+/** We have finished using this obd and are ready to destroy it.
+ * There can be no more references to this obd.
+ */
int class_detach(struct obd_device *obd, struct lustre_cfg *lcfg)
{
ENTRY;
RETURN(0);
}
+/** Start shutting down the obd. There may be in-progess ops when
+ * this is called. We tell them to start shutting down with a call
+ * to class_disconnect_exports().
+ */
int class_cleanup(struct obd_device *obd, struct lustre_cfg *lcfg)
{
int err = 0;
}
}
+/** Add a failover nid location.
+ * Client obd types contact server obd types using this nid list.
+ */
int class_add_conn(struct obd_device *obd, struct lustre_cfg *lcfg)
{
struct obd_import *imp;
RETURN(rc);
}
+/** Remove a failover nid location.
+ */
int class_del_conn(struct obd_device *obd, struct lustre_cfg *lcfg)
{
struct obd_import *imp;
RETURN(NULL);
}
+/** Create a named "profile".
+ * This defines the mdc and osc names to use for a client.
+ * This also is used to define the lov to be used by a mdt.
+ */
int class_add_profile(int proflen, char *prof, int osclen, char *osc,
int mdclen, char *mdc)
{
}
EXPORT_SYMBOL(lustre_register_client_process_config);
+/** Process configuration commands given in lustre_cfg form.
+ * These may come from direct calls (e.g. class_manual_cleanup)
+ * or processing the config llog, or ioctl from lctl.
+ */
int class_process_config(struct lustre_cfg *lcfg)
{
struct obd_device *obd;
#define lustre_check_exclusion(a,b) 0
#endif
+/** Parse a configuration llog, doing various manipulations on them
+ * for various reasons, (modifications for compatibility, skip obsolete
+ * records, change uuids, etc), then class_process_config() resulting
+ * net records.
+ */
static int class_config_llog_handler(struct llog_handle * handle,
struct llog_rec_hdr *rec, void *data)
{
}
-/* Cleanup and detach */
+/** Call class_cleanup and class_detach.
+ * "Manual" only in the sense that we're faking lcfg commands.
+ */
int class_manual_cleanup(struct obd_device *obd)
{
char flags[3] = "";
/**************** config llog ********************/
-/* Get a config log from the MGS and process it.
- This func is called for both clients and servers.
- Continue to process new statements appended to the logs
- (whenever the config lock is revoked) until lustre_end_log
- is called. */
+/** Get a config log from the MGS and process it.
+ * This func is called for both clients and servers.
+ * Continue to process new statements appended to the logs
+ * (whenever the config lock is revoked) until lustre_end_log
+ * is called.
+ * @param sb The superblock is used by the MGC to write to the local copy of
+ * the config log
+ * @param logname The name of the llog to replicate from the MGS
+ * @param cfg Since the same mgc may be used to follow multiple config logs
+ * (e.g. ost1, ost2, client), the config_llog_instance keeps the state for
+ * this log, and is added to the mgc's list of logs to follow.
+ */
int lustre_process_log(struct super_block *sb, char *logname,
struct config_llog_instance *cfg)
{
/**************** obd start *******************/
+/** lustre_cfg_bufs are a holdover from 1.4; we can still set these up from
+ * lctl (and do for echo cli/srv.
+ */
int do_lcfg(char *cfgname, lnet_nid_t nid, int cmd,
char *s1, char *s2, char *s3, char *s4)
{
return(rc);
}
+/** Call class_attach and class_setup. These methods in turn call
+ * obd type-specific methods.
+ */
static int lustre_start_simple(char *obdname, char *type, char *uuid,
char *s1, char *s2)
{
RETURN(rc);
}
-/* Start targets */
+/** Start server targets: MDTs and OSTs
+ */
static int server_start_targets(struct super_block *sb, struct vfsmount *mnt)
{
struct obd_device *obd;
cfs_mutex_up(&server_start_lock);
}
- /* Set the mgc fs to our server disk. This allows the MGC
- to read and write configs locally. */
+ /* Set the mgc fs to our server disk. This allows the MGC to
+ * read and write configs locally, in case it can't talk to the MGS. */
rc = server_mgc_set_fs(lsi->lsi_mgc, sb);
if (rc)
RETURN(rc);
/*************** server mount ******************/
-/* Kernel mount using mount options in MOUNT_DATA_FILE */
+/** Kernel mount using mount options in MOUNT_DATA_FILE.
+ * Since this file lives on the disk, we pre-mount using a common
+ * type, read the file, then re-mount using the type specified in the
+ * file.
+ */
static struct vfsmount *server_kernel_mount(struct super_block *sb)
{
struct lvfs_run_ctxt mount_ctxt;
RETURN(ERR_PTR(rc));
}
-/* Wait here forever until the mount refcount is 0 before completing umount,
+/** Wait here forever until the mount refcount is 0 before completing umount,
* else we risk dereferencing a null pointer.
* LNET may take e.g. 165s before killing zombies.
*/
}
}
+/** Start the shutdown of servers at umount.
+ */
static void server_put_super(struct super_block *sb)
{
struct lustre_sb_info *lsi = s2lsi(sb);
EXIT;
}
+/** Called only for 'umount -f'
+ */
#ifdef HAVE_UMOUNTBEGIN_VFSMOUNT
static void server_umount_begin(struct vfsmount *vfsmnt, int flags)
{
RETURN(0);
}
+/** The operations we support directly on the superblock:
+ * mount, umount, and df.
+ */
static struct super_operations server_ops =
{
.put_super = server_put_super,
RETURN(0);
}
+/** Fill in the superblock info for a Lustre server.
+ * Mount the device with the correct options.
+ * Read the on-disk config file.
+ * Start the services.
+ */
static int server_fill_super(struct super_block *sb)
{
struct lustre_sb_info *lsi = s2lsi(sb);
GOTO(out_mnt, rc);
}
+ /* Start MGC before servers */
rc = lustre_start_mgc(sb);
if (rc)
GOTO(out_mnt, rc);
return 0;
}
-/* mount -v -t lustre uml1:uml2:/lustre-client /mnt/lustre */
+/** Parse mount line options
+ * e.g. mount -v -t lustre -o abort_recov uml1:uml2:/lustre-client /mnt/lustre
+ * dev is passed as device=uml1:/lustre by mount.lustre
+ */
static int lmd_parse(char *options, struct lustre_mount_data *lmd)
{
char *s1, *s2, *devname = NULL;
}
-/* Common mount */
+/** This is the entry point for the mount call into Lustre.
+ * This is called when a server or client is mounted,
+ * and this is where we start setting things up.
+ * @param data Mount options (e.g. -o flock,abort_recov)
+ */
int lustre_fill_super(struct super_block *sb, void *data, int silent)
{
struct lustre_mount_data *lmd;
kill_anon_super(sb);
}
+/** Register the "lustre" fs type
+ */
struct file_system_type lustre_fs_type = {
.owner = THIS_MODULE,
.name = "lustre",
git://git.whamcloud.com / fs / lustre-release.git / commitdiff