fs/orangefs/orangefs-mod.c - kernel/quantenna - Git at Google

 /*
  * (C) 2001 Clemson University and The University of Chicago
  *
  * Changes by Acxiom Corporation to add proc file handler for pvfs2 client
  * parameters, Copyright Acxiom Corporation, 2005.
  *
  * See COPYING in top-level directory.
  */

 #include "protocol.h"
 #include "orangefs-kernel.h"
 #include "orangefs-debugfs.h"
 #include "orangefs-sysfs.h"

 /* ORANGEFS_VERSION is a ./configure define */
 #ifndef ORANGEFS_VERSION
 #define ORANGEFS_VERSION "upstream"
 #endif

 /*
  * global variables declared here
  */

 /* array of client debug keyword/mask values */
 struct client_debug_mask *cdm_array;
 int cdm_element_count;

 char kernel_debug_string[ORANGEFS_MAX_DEBUG_STRING_LEN] = "none";
 char client_debug_string[ORANGEFS_MAX_DEBUG_STRING_LEN];
 char client_debug_array_string[ORANGEFS_MAX_DEBUG_STRING_LEN];

 char *debug_help_string;
 int help_string_initialized;
 struct dentry *help_file_dentry;
 struct dentry *client_debug_dentry;
 struct dentry *debug_dir;
 int client_verbose_index;
 int client_all_index;
 struct orangefs_stats g_orangefs_stats;

 /* the size of the hash tables for ops in progress */
 int hash_table_size = 509;

 static ulong module_parm_debug_mask;
 __u64 gossip_debug_mask;
 struct client_debug_mask client_debug_mask = { NULL, 0, 0 };
 unsigned int kernel_mask_set_mod_init; /* implicitly false */
 int op_timeout_secs = ORANGEFS_DEFAULT_OP_TIMEOUT_SECS;
 int slot_timeout_secs = ORANGEFS_DEFAULT_SLOT_TIMEOUT_SECS;

 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("ORANGEFS Development Team");
 MODULE_DESCRIPTION("The Linux Kernel VFS interface to ORANGEFS");
 MODULE_PARM_DESC(module_parm_debug_mask, "debugging level (see orangefs-debug.h for values)");
 MODULE_PARM_DESC(op_timeout_secs, "Operation timeout in seconds");
 MODULE_PARM_DESC(slot_timeout_secs, "Slot timeout in seconds");
 MODULE_PARM_DESC(hash_table_size,
 		 "size of hash table for operations in progress");

 static struct file_system_type orangefs_fs_type = {
 	.name = "pvfs2",
 	.mount = orangefs_mount,
 	.kill_sb = orangefs_kill_sb,
 	.owner = THIS_MODULE,
 };

 module_param(hash_table_size, int, 0);
 module_param(module_parm_debug_mask, ulong, 0644);
 module_param(op_timeout_secs, int, 0);
 module_param(slot_timeout_secs, int, 0);

 /* synchronizes the request device file */
 DEFINE_MUTEX(devreq_mutex);

 /*
  * Blocks non-priority requests from being queued for servicing.  This
  * could be used for protecting the request list data structure, but
  * for now it's only being used to stall the op addition to the request
  * list
  */
 DEFINE_MUTEX(request_mutex);

 /* hash table for storing operations waiting for matching downcall */
 struct list_head *htable_ops_in_progress;
 DEFINE_SPINLOCK(htable_ops_in_progress_lock);

 /* list for queueing upcall operations */
 LIST_HEAD(orangefs_request_list);

 /* used to protect the above orangefs_request_list */
 DEFINE_SPINLOCK(orangefs_request_list_lock);

 /* used for incoming request notification */
 DECLARE_WAIT_QUEUE_HEAD(orangefs_request_list_waitq);

 static int __init orangefs_init(void)
 {
 	int ret = -1;
 	__u32 i = 0;

 	/* convert input debug mask to a 64-bit unsigned integer */
 	gossip_debug_mask = (unsigned long long) module_parm_debug_mask;

 	/*
 	 * set the kernel's gossip debug string; invalid mask values will
 	 * be ignored.
 	 */
 	debug_mask_to_string(&gossip_debug_mask, 0);

 	/* remove any invalid values from the mask */
 	debug_string_to_mask(kernel_debug_string, &gossip_debug_mask, 0);

 	/*
 	 * if the mask has a non-zero value, then indicate that the mask
 	 * was set when the kernel module was loaded.  The orangefs dev ioctl
 	 * command will look at this boolean to determine if the kernel's
 	 * debug mask should be overwritten when the client-core is started.
 	 */
 	if (gossip_debug_mask != 0)
 		kernel_mask_set_mod_init = true;

 	pr_info("%s: called with debug mask: :%s: :%llx:\n",
 		__func__,
 		kernel_debug_string,
 		(unsigned long long)gossip_debug_mask);

 	ret = bdi_init(&orangefs_backing_dev_info);

 	if (ret)
 		return ret;

 	if (op_timeout_secs < 0)
 		op_timeout_secs = 0;

 	if (slot_timeout_secs < 0)
 		slot_timeout_secs = 0;

 	/* initialize global book keeping data structures */
 	ret = op_cache_initialize();
 	if (ret < 0)
 		goto err;

 	ret = orangefs_inode_cache_initialize();
 	if (ret < 0)
 		goto cleanup_op;

 	htable_ops_in_progress =
 	    kcalloc(hash_table_size, sizeof(struct list_head), GFP_KERNEL);
 	if (!htable_ops_in_progress) {
 		gossip_err("Failed to initialize op hashtable");
 		ret = -ENOMEM;
 		goto cleanup_inode;
 	}

 	/* initialize a doubly linked at each hash table index */
 	for (i = 0; i < hash_table_size; i++)
 		INIT_LIST_HEAD(&htable_ops_in_progress[i]);

 	ret = fsid_key_table_initialize();
 	if (ret < 0)
 		goto cleanup_progress_table;

 	/*
 	 * Build the contents of /sys/kernel/debug/orangefs/debug-help
 	 * from the keywords in the kernel keyword/mask array.
 	 *
 	 * The keywords in the client keyword/mask array are
 	 * unknown at boot time.
 	 *
 	 * orangefs_prepare_debugfs_help_string will be used again
 	 * later to rebuild the debug-help file after the client starts
 	 * and passes along the needed info. The argument signifies
 	 * which time orangefs_prepare_debugfs_help_string is being
 	 * called.
 	 */
 	ret = orangefs_prepare_debugfs_help_string(1);
 	if (ret)
 		goto cleanup_key_table;

 	ret = orangefs_debugfs_init();
 	if (ret)
 		goto debugfs_init_failed;

 	ret = orangefs_kernel_debug_init();
 	if (ret)
 		goto kernel_debug_init_failed;

 	ret = orangefs_sysfs_init();
 	if (ret)
 		goto sysfs_init_failed;

 	/* Initialize the orangefsdev subsystem. */
 	ret = orangefs_dev_init();
 	if (ret < 0) {
 		gossip_err("%s: could not initialize device subsystem %d!\n",
 			   __func__,
 			   ret);
 		goto cleanup_device;
 	}

 	ret = register_filesystem(&orangefs_fs_type);
 	if (ret == 0) {
 		pr_info("orangefs: module version %s loaded\n", ORANGEFS_VERSION);
 		ret = 0;
 		goto out;
 	}

 	orangefs_sysfs_exit();

 cleanup_device:
 	orangefs_dev_cleanup();

 sysfs_init_failed:

 kernel_debug_init_failed:

 debugfs_init_failed:
 	orangefs_debugfs_cleanup();

 cleanup_key_table:
 	fsid_key_table_finalize();

 cleanup_progress_table:
 	kfree(htable_ops_in_progress);

 cleanup_inode:
 	orangefs_inode_cache_finalize();

 cleanup_op:
 	op_cache_finalize();

 err:
 	bdi_destroy(&orangefs_backing_dev_info);

 out:
 	return ret;
 }

 static void __exit orangefs_exit(void)
 {
 	int i = 0;
 	gossip_debug(GOSSIP_INIT_DEBUG, "orangefs: orangefs_exit called\n");

 	unregister_filesystem(&orangefs_fs_type);
 	orangefs_debugfs_cleanup();
 	orangefs_sysfs_exit();
 	fsid_key_table_finalize();
 	orangefs_dev_cleanup();
 	BUG_ON(!list_empty(&orangefs_request_list));
 	for (i = 0; i < hash_table_size; i++)
 		BUG_ON(!list_empty(&htable_ops_in_progress[i]));

 	orangefs_inode_cache_finalize();
 	op_cache_finalize();

 	kfree(htable_ops_in_progress);

 	bdi_destroy(&orangefs_backing_dev_info);

 	pr_info("orangefs: module version %s unloaded\n", ORANGEFS_VERSION);
 }

 /*
  * What we do in this function is to walk the list of operations
  * that are in progress in the hash table and mark them as purged as well.
  */
 void purge_inprogress_ops(void)
 {
 	int i;

 	for (i = 0; i < hash_table_size; i++) {
 		struct orangefs_kernel_op_s *op;
 		struct orangefs_kernel_op_s *next;

 		spin_lock(&htable_ops_in_progress_lock);
 		list_for_each_entry_safe(op,
 					 next,
 					 &htable_ops_in_progress[i],
 					 list) {
 			set_op_state_purged(op);
 			gossip_debug(GOSSIP_DEV_DEBUG,
 				     "%s: op:%s: op_state:%d: process:%s:\n",
 				     __func__,
 				     get_opname_string(op),
 				     op->op_state,
 				     current->comm);
 		}
 		spin_unlock(&htable_ops_in_progress_lock);
 	}
 }

 module_init(orangefs_init);
 module_exit(orangefs_exit);
	/*
	* (C) 2001 Clemson University and The University of Chicago
	*
	* Changes by Acxiom Corporation to add proc file handler for pvfs2 client
	* parameters, Copyright Acxiom Corporation, 2005.
	*
	* See COPYING in top-level directory.
	*/

	#include "protocol.h"
	#include "orangefs-kernel.h"
	#include "orangefs-debugfs.h"
	#include "orangefs-sysfs.h"

	/* ORANGEFS_VERSION is a ./configure define */
	#ifndef ORANGEFS_VERSION
	#define ORANGEFS_VERSION "upstream"
	#endif

	/*
	* global variables declared here
	*/

	/* array of client debug keyword/mask values */
	struct client_debug_mask *cdm_array;
	int cdm_element_count;

	char kernel_debug_string[ORANGEFS_MAX_DEBUG_STRING_LEN] = "none";
	char client_debug_string[ORANGEFS_MAX_DEBUG_STRING_LEN];
	char client_debug_array_string[ORANGEFS_MAX_DEBUG_STRING_LEN];

	char *debug_help_string;
	int help_string_initialized;
	struct dentry *help_file_dentry;
	struct dentry *client_debug_dentry;
	struct dentry *debug_dir;
	int client_verbose_index;
	int client_all_index;
	struct orangefs_stats g_orangefs_stats;

	/* the size of the hash tables for ops in progress */
	int hash_table_size = 509;

	static ulong module_parm_debug_mask;
	__u64 gossip_debug_mask;
	struct client_debug_mask client_debug_mask = { NULL, 0, 0 };
	unsigned int kernel_mask_set_mod_init; /* implicitly false */
	int op_timeout_secs = ORANGEFS_DEFAULT_OP_TIMEOUT_SECS;
	int slot_timeout_secs = ORANGEFS_DEFAULT_SLOT_TIMEOUT_SECS;

	MODULE_LICENSE("GPL");
	MODULE_AUTHOR("ORANGEFS Development Team");
	MODULE_DESCRIPTION("The Linux Kernel VFS interface to ORANGEFS");
	MODULE_PARM_DESC(module_parm_debug_mask, "debugging level (see orangefs-debug.h for values)");
	MODULE_PARM_DESC(op_timeout_secs, "Operation timeout in seconds");
	MODULE_PARM_DESC(slot_timeout_secs, "Slot timeout in seconds");
	MODULE_PARM_DESC(hash_table_size,
	"size of hash table for operations in progress");

	static struct file_system_type orangefs_fs_type = {
	.name = "pvfs2",
	.mount = orangefs_mount,
	.kill_sb = orangefs_kill_sb,
	.owner = THIS_MODULE,
	};

	module_param(hash_table_size, int, 0);
	module_param(module_parm_debug_mask, ulong, 0644);
	module_param(op_timeout_secs, int, 0);
	module_param(slot_timeout_secs, int, 0);

	/* synchronizes the request device file */
	DEFINE_MUTEX(devreq_mutex);

	/*
	* Blocks non-priority requests from being queued for servicing. This
	* could be used for protecting the request list data structure, but
	* for now it's only being used to stall the op addition to the request
	* list
	*/
	DEFINE_MUTEX(request_mutex);

	/* hash table for storing operations waiting for matching downcall */
	struct list_head *htable_ops_in_progress;
	DEFINE_SPINLOCK(htable_ops_in_progress_lock);

	/* list for queueing upcall operations */
	LIST_HEAD(orangefs_request_list);

	/* used to protect the above orangefs_request_list */
	DEFINE_SPINLOCK(orangefs_request_list_lock);

	/* used for incoming request notification */
	DECLARE_WAIT_QUEUE_HEAD(orangefs_request_list_waitq);

	static int __init orangefs_init(void)
	{
	int ret = -1;
	__u32 i = 0;

	/* convert input debug mask to a 64-bit unsigned integer */
	gossip_debug_mask = (unsigned long long) module_parm_debug_mask;

	/*
	* set the kernel's gossip debug string; invalid mask values will
	* be ignored.
	*/
	debug_mask_to_string(&gossip_debug_mask, 0);

	/* remove any invalid values from the mask */
	debug_string_to_mask(kernel_debug_string, &gossip_debug_mask, 0);

	/*
	* if the mask has a non-zero value, then indicate that the mask
	* was set when the kernel module was loaded. The orangefs dev ioctl
	* command will look at this boolean to determine if the kernel's
	* debug mask should be overwritten when the client-core is started.
	*/
	if (gossip_debug_mask != 0)
	kernel_mask_set_mod_init = true;

	pr_info("%s: called with debug mask: :%s: :%llx:\n",
	__func__,
	kernel_debug_string,
	(unsigned long long)gossip_debug_mask);

	ret = bdi_init(&orangefs_backing_dev_info);

	if (ret)
	return ret;

	if (op_timeout_secs < 0)
	op_timeout_secs = 0;

	if (slot_timeout_secs < 0)
	slot_timeout_secs = 0;

	/* initialize global book keeping data structures */
	ret = op_cache_initialize();
	if (ret < 0)
	goto err;

	ret = orangefs_inode_cache_initialize();
	if (ret < 0)
	goto cleanup_op;

	htable_ops_in_progress =
	kcalloc(hash_table_size, sizeof(struct list_head), GFP_KERNEL);
	if (!htable_ops_in_progress) {
	gossip_err("Failed to initialize op hashtable");
	ret = -ENOMEM;
	goto cleanup_inode;
	}

	/* initialize a doubly linked at each hash table index */
	for (i = 0; i < hash_table_size; i++)
	INIT_LIST_HEAD(&htable_ops_in_progress[i]);

	ret = fsid_key_table_initialize();
	if (ret < 0)
	goto cleanup_progress_table;

	/*
	* Build the contents of /sys/kernel/debug/orangefs/debug-help
	* from the keywords in the kernel keyword/mask array.
	*
	* The keywords in the client keyword/mask array are
	* unknown at boot time.
	*
	* orangefs_prepare_debugfs_help_string will be used again
	* later to rebuild the debug-help file after the client starts
	* and passes along the needed info. The argument signifies
	* which time orangefs_prepare_debugfs_help_string is being
	* called.
	*/
	ret = orangefs_prepare_debugfs_help_string(1);
	if (ret)
	goto cleanup_key_table;

	ret = orangefs_debugfs_init();
	if (ret)
	goto debugfs_init_failed;

	ret = orangefs_kernel_debug_init();
	if (ret)
	goto kernel_debug_init_failed;

	ret = orangefs_sysfs_init();
	if (ret)
	goto sysfs_init_failed;

	/* Initialize the orangefsdev subsystem. */
	ret = orangefs_dev_init();
	if (ret < 0) {
	gossip_err("%s: could not initialize device subsystem %d!\n",
	__func__,
	ret);
	goto cleanup_device;
	}

	ret = register_filesystem(&orangefs_fs_type);
	if (ret == 0) {
	pr_info("orangefs: module version %s loaded\n", ORANGEFS_VERSION);
	ret = 0;
	goto out;
	}

	orangefs_sysfs_exit();

	cleanup_device:
	orangefs_dev_cleanup();

	sysfs_init_failed:

	kernel_debug_init_failed:

	debugfs_init_failed:
	orangefs_debugfs_cleanup();

	cleanup_key_table:
	fsid_key_table_finalize();

	cleanup_progress_table:
	kfree(htable_ops_in_progress);

	cleanup_inode:
	orangefs_inode_cache_finalize();

	cleanup_op:
	op_cache_finalize();

	err:
	bdi_destroy(&orangefs_backing_dev_info);

	out:
	return ret;
	}

	static void __exit orangefs_exit(void)
	{
	int i = 0;
	gossip_debug(GOSSIP_INIT_DEBUG, "orangefs: orangefs_exit called\n");

	unregister_filesystem(&orangefs_fs_type);
	orangefs_debugfs_cleanup();
	orangefs_sysfs_exit();
	fsid_key_table_finalize();
	orangefs_dev_cleanup();
	BUG_ON(!list_empty(&orangefs_request_list));
	for (i = 0; i < hash_table_size; i++)
	BUG_ON(!list_empty(&htable_ops_in_progress[i]));

	orangefs_inode_cache_finalize();
	op_cache_finalize();

	kfree(htable_ops_in_progress);

	bdi_destroy(&orangefs_backing_dev_info);

	pr_info("orangefs: module version %s unloaded\n", ORANGEFS_VERSION);
	}

	/*
	* What we do in this function is to walk the list of operations
	* that are in progress in the hash table and mark them as purged as well.
	*/
	void purge_inprogress_ops(void)
	{
	int i;

	for (i = 0; i < hash_table_size; i++) {
	struct orangefs_kernel_op_s *op;
	struct orangefs_kernel_op_s *next;

	spin_lock(&htable_ops_in_progress_lock);
	list_for_each_entry_safe(op,
	next,
	&htable_ops_in_progress[i],
	list) {
	set_op_state_purged(op);
	gossip_debug(GOSSIP_DEV_DEBUG,
	"%s: op:%s: op_state:%d: process:%s:\n",
	__func__,
	get_opname_string(op),
	op->op_state,
	current->comm);
	}
	spin_unlock(&htable_ops_in_progress_lock);
	}
	}

	module_init(orangefs_init);
	module_exit(orangefs_exit);