[linux.git] / fs / orangefs / super.c

/*
 * (C) 2001 Clemson University and The University of Chicago
 *
 * See COPYING in top-level directory.
 */

#include "protocol.h"
#include "pvfs2-kernel.h"
#include "pvfs2-bufmap.h"

#include <linux/parser.h>

/* a cache for pvfs2-inode objects (i.e. pvfs2 inode private data) */
static struct kmem_cache *pvfs2_inode_cache;

/* list for storing pvfs2 specific superblocks in use */
LIST_HEAD(pvfs2_superblocks);

DEFINE_SPINLOCK(pvfs2_superblocks_lock);

enum {
	Opt_intr,
	Opt_acl,
	Opt_local_lock,

	Opt_err
};

static const match_table_t tokens = {
	{ Opt_acl,		"acl" },
	{ Opt_intr,		"intr" },
	{ Opt_local_lock,	"local_lock" },
	{ Opt_err,	NULL }
};


static int parse_mount_options(struct super_block *sb, char *options,
		int silent)
{
	struct pvfs2_sb_info_s *pvfs2_sb = PVFS2_SB(sb);
	substring_t args[MAX_OPT_ARGS];
	char *p;

	/*
	 * Force any potential flags that might be set from the mount
	 * to zero, ie, initialize to unset.
	 */
	sb->s_flags &= ~MS_POSIXACL;
	pvfs2_sb->flags &= ~PVFS2_OPT_INTR;
	pvfs2_sb->flags &= ~PVFS2_OPT_LOCAL_LOCK;

	while ((p = strsep(&options, ",")) != NULL) {
		int token;

		if (!*p)
			continue;

		token = match_token(p, tokens, args);
		switch (token) {
		case Opt_acl:
			sb->s_flags |= MS_POSIXACL;
			break;
		case Opt_intr:
			pvfs2_sb->flags |= PVFS2_OPT_INTR;
			break;
		case Opt_local_lock:
			pvfs2_sb->flags |= PVFS2_OPT_LOCAL_LOCK;
			break;
		default:
			goto fail;
		}
	}

	return 0;
fail:
	if (!silent)
		gossip_err("Error: mount option [%s] is not supported.\n", p);
	return -EINVAL;
}

static void pvfs2_inode_cache_ctor(void *req)
{
	struct pvfs2_inode_s *pvfs2_inode = req;

	inode_init_once(&pvfs2_inode->vfs_inode);
	init_rwsem(&pvfs2_inode->xattr_sem);

	pvfs2_inode->vfs_inode.i_version = 1;
}

static struct inode *pvfs2_alloc_inode(struct super_block *sb)
{
	struct pvfs2_inode_s *pvfs2_inode;

	pvfs2_inode = kmem_cache_alloc(pvfs2_inode_cache,
				       PVFS2_CACHE_ALLOC_FLAGS);
	if (pvfs2_inode == NULL) {
		gossip_err("Failed to allocate pvfs2_inode\n");
		return NULL;
	}

	/*
	 * We want to clear everything except for rw_semaphore and the
	 * vfs_inode.
	 */
	memset(&pvfs2_inode->refn.khandle, 0, 16);
	pvfs2_inode->refn.fs_id = PVFS_FS_ID_NULL;
	pvfs2_inode->last_failed_block_index_read = 0;
	memset(pvfs2_inode->link_target, 0, sizeof(pvfs2_inode->link_target));
	pvfs2_inode->pinode_flags = 0;

	gossip_debug(GOSSIP_SUPER_DEBUG,
		     "pvfs2_alloc_inode: allocated %p\n",
		     &pvfs2_inode->vfs_inode);
	return &pvfs2_inode->vfs_inode;
}

static void pvfs2_destroy_inode(struct inode *inode)
{
	struct pvfs2_inode_s *pvfs2_inode = PVFS2_I(inode);

	gossip_debug(GOSSIP_SUPER_DEBUG,
			"%s: deallocated %p destroying inode %pU\n",
			__func__, pvfs2_inode, get_khandle_from_ino(inode));

	kmem_cache_free(pvfs2_inode_cache, pvfs2_inode);
}

/*
 * NOTE: information filled in here is typically reflected in the
 * output of the system command 'df'
*/
static int pvfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
{
	int ret = -ENOMEM;
	struct pvfs2_kernel_op_s *new_op = NULL;
	int flags = 0;
	struct super_block *sb = NULL;

	sb = dentry->d_sb;

	gossip_debug(GOSSIP_SUPER_DEBUG,
		     "pvfs2_statfs: called on sb %p (fs_id is %d)\n",
		     sb,
		     (int)(PVFS2_SB(sb)->fs_id));

	new_op = op_alloc(PVFS2_VFS_OP_STATFS);
	if (!new_op)
		return ret;
	new_op->upcall.req.statfs.fs_id = PVFS2_SB(sb)->fs_id;

	if (PVFS2_SB(sb)->flags & PVFS2_OPT_INTR)
		flags = PVFS2_OP_INTERRUPTIBLE;

	ret = service_operation(new_op, "pvfs2_statfs", flags);

	if (new_op->downcall.status < 0)
		goto out_op_release;

	gossip_debug(GOSSIP_SUPER_DEBUG,
		     "pvfs2_statfs: got %ld blocks available | "
		     "%ld blocks total | %ld block size\n",
		     (long)new_op->downcall.resp.statfs.blocks_avail,
		     (long)new_op->downcall.resp.statfs.blocks_total,
		     (long)new_op->downcall.resp.statfs.block_size);

	buf->f_type = sb->s_magic;
	memcpy(&buf->f_fsid, &PVFS2_SB(sb)->fs_id, sizeof(buf->f_fsid));
	buf->f_bsize = new_op->downcall.resp.statfs.block_size;
	buf->f_namelen = PVFS2_NAME_LEN;

	buf->f_blocks = (sector_t) new_op->downcall.resp.statfs.blocks_total;
	buf->f_bfree = (sector_t) new_op->downcall.resp.statfs.blocks_avail;
	buf->f_bavail = (sector_t) new_op->downcall.resp.statfs.blocks_avail;
	buf->f_files = (sector_t) new_op->downcall.resp.statfs.files_total;
	buf->f_ffree = (sector_t) new_op->downcall.resp.statfs.files_avail;
	buf->f_frsize = sb->s_blocksize;

out_op_release:
	op_release(new_op);
	gossip_debug(GOSSIP_SUPER_DEBUG, "pvfs2_statfs: returning %d\n", ret);
	return ret;
}

/*
 * Remount as initiated by VFS layer.  We just need to reparse the mount
 * options, no need to signal pvfs2-client-core about it.
 */
static int pvfs2_remount_fs(struct super_block *sb, int *flags, char *data)
{
	gossip_debug(GOSSIP_SUPER_DEBUG, "pvfs2_remount_fs: called\n");
	return parse_mount_options(sb, data, 1);
}

/*
 * Remount as initiated by pvfs2-client-core on restart.  This is used to
 * repopulate mount information left from previous pvfs2-client-core.
 *
 * the idea here is that given a valid superblock, we're
 * re-initializing the user space client with the initial mount
 * information specified when the super block was first initialized.
 * this is very different than the first initialization/creation of a
 * superblock.  we use the special service_priority_operation to make
 * sure that the mount gets ahead of any other pending operation that
 * is waiting for servicing.  this means that the pvfs2-client won't
 * fail to start several times for all other pending operations before
 * the client regains all of the mount information from us.
 * NOTE: this function assumes that the request_mutex is already acquired!
 */
int pvfs2_remount(struct super_block *sb)
{
	struct pvfs2_kernel_op_s *new_op;
	int ret = -EINVAL;

	gossip_debug(GOSSIP_SUPER_DEBUG, "pvfs2_remount: called\n");

	new_op = op_alloc(PVFS2_VFS_OP_FS_MOUNT);
	if (!new_op)
		return -ENOMEM;
	strncpy(new_op->upcall.req.fs_mount.pvfs2_config_server,
		PVFS2_SB(sb)->devname,
		PVFS_MAX_SERVER_ADDR_LEN);

	gossip_debug(GOSSIP_SUPER_DEBUG,
		     "Attempting PVFS2 Remount via host %s\n",
		     new_op->upcall.req.fs_mount.pvfs2_config_server);

	/*
	 * we assume that the calling function has already acquire the
	 * request_mutex to prevent other operations from bypassing
	 * this one
	 */
	ret = service_operation(new_op, "pvfs2_remount",
		PVFS2_OP_PRIORITY | PVFS2_OP_NO_SEMAPHORE);
	gossip_debug(GOSSIP_SUPER_DEBUG,
		     "pvfs2_remount: mount got return value of %d\n",
		     ret);
	if (ret == 0) {
		/*
		 * store the id assigned to this sb -- it's just a
		 * short-lived mapping that the system interface uses
		 * to map this superblock to a particular mount entry
		 */
		PVFS2_SB(sb)->id = new_op->downcall.resp.fs_mount.id;
		PVFS2_SB(sb)->mount_pending = 0;
	}

	op_release(new_op);
	return ret;
}

int fsid_key_table_initialize(void)
{
	return 0;
}

void fsid_key_table_finalize(void)
{
}

/* Called whenever the VFS dirties the inode in response to atime updates */
static void pvfs2_dirty_inode(struct inode *inode, int flags)
{
	struct pvfs2_inode_s *pvfs2_inode = PVFS2_I(inode);

	gossip_debug(GOSSIP_SUPER_DEBUG,
		     "pvfs2_dirty_inode: %pU\n",
		     get_khandle_from_ino(inode));
	SetAtimeFlag(pvfs2_inode);
}

struct super_operations pvfs2_s_ops = {
	.alloc_inode = pvfs2_alloc_inode,
	.destroy_inode = pvfs2_destroy_inode,
	.dirty_inode = pvfs2_dirty_inode,
	.drop_inode = generic_delete_inode,
	.statfs = pvfs2_statfs,
	.remount_fs = pvfs2_remount_fs,
	.show_options = generic_show_options,
};

struct dentry *pvfs2_fh_to_dentry(struct super_block *sb,
				  struct fid *fid,
				  int fh_len,
				  int fh_type)
{
	struct pvfs2_object_kref refn;

	if (fh_len < 5 || fh_type > 2)
		return NULL;

	PVFS_khandle_from(&(refn.khandle), fid->raw, 16);
	refn.fs_id = (u32) fid->raw[4];
	gossip_debug(GOSSIP_SUPER_DEBUG,
		     "fh_to_dentry: handle %pU, fs_id %d\n",
		     &refn.khandle,
		     refn.fs_id);

	return d_obtain_alias(pvfs2_iget(sb, &refn));
}

int pvfs2_encode_fh(struct inode *inode,
		    __u32 *fh,
		    int *max_len,
		    struct inode *parent)
{
	int len = parent ? 10 : 5;
	int type = 1;
	struct pvfs2_object_kref refn;

	if (*max_len < len) {
		gossip_lerr("fh buffer is too small for encoding\n");
		*max_len = len;
		type = 255;
		goto out;
	}

	refn = PVFS2_I(inode)->refn;
	PVFS_khandle_to(&refn.khandle, fh, 16);
	fh[4] = refn.fs_id;

	gossip_debug(GOSSIP_SUPER_DEBUG,
		     "Encoding fh: handle %pU, fsid %u\n",
		     &refn.khandle,
		     refn.fs_id);


	if (parent) {
		refn = PVFS2_I(parent)->refn;
		PVFS_khandle_to(&refn.khandle, (char *) fh + 20, 16);
		fh[9] = refn.fs_id;

		type = 2;
		gossip_debug(GOSSIP_SUPER_DEBUG,
			     "Encoding parent: handle %pU, fsid %u\n",
			     &refn.khandle,
			     refn.fs_id);
	}
	*max_len = len;

out:
	return type;
}

static struct export_operations pvfs2_export_ops = {
	.encode_fh = pvfs2_encode_fh,
	.fh_to_dentry = pvfs2_fh_to_dentry,
};

int pvfs2_fill_sb(struct super_block *sb, void *data, int silent)
{
	int ret = -EINVAL;
	struct inode *root = NULL;
	struct dentry *root_dentry = NULL;
	struct pvfs2_mount_sb_info_s *mount_sb_info =
		(struct pvfs2_mount_sb_info_s *) data;
	struct pvfs2_object_kref root_object;

	/* alloc and init our private pvfs2 sb info */
	sb->s_fs_info =
		kmalloc(sizeof(struct pvfs2_sb_info_s), PVFS2_GFP_FLAGS);
	if (!PVFS2_SB(sb))
		return -ENOMEM;
	memset(sb->s_fs_info, 0, sizeof(struct pvfs2_sb_info_s));
	PVFS2_SB(sb)->sb = sb;

	PVFS2_SB(sb)->root_khandle = mount_sb_info->root_khandle;
	PVFS2_SB(sb)->fs_id = mount_sb_info->fs_id;
	PVFS2_SB(sb)->id = mount_sb_info->id;

	if (mount_sb_info->data) {
		ret = parse_mount_options(sb, mount_sb_info->data,
					  silent);
		if (ret)
			return ret;
	}

	/* Hang the xattr handlers off the superblock */
	sb->s_xattr = pvfs2_xattr_handlers;
	sb->s_magic = PVFS2_SUPER_MAGIC;
	sb->s_op = &pvfs2_s_ops;
	sb->s_d_op = &pvfs2_dentry_operations;

	sb->s_blocksize = pvfs_bufmap_size_query();
	sb->s_blocksize_bits = pvfs_bufmap_shift_query();
	sb->s_maxbytes = MAX_LFS_FILESIZE;

	root_object.khandle = PVFS2_SB(sb)->root_khandle;
	root_object.fs_id = PVFS2_SB(sb)->fs_id;
	gossip_debug(GOSSIP_SUPER_DEBUG,
		     "get inode %pU, fsid %d\n",
		     &root_object.khandle,
		     root_object.fs_id);

	root = pvfs2_iget(sb, &root_object);
	if (IS_ERR(root))
		return PTR_ERR(root);

	gossip_debug(GOSSIP_SUPER_DEBUG,
		     "Allocated root inode [%p] with mode %x\n",
		     root,
		     root->i_mode);

	/* allocates and places root dentry in dcache */
	root_dentry = d_make_root(root);
	if (!root_dentry) {
		iput(root);
		return -ENOMEM;
	}

	sb->s_export_op = &pvfs2_export_ops;
	sb->s_root = root_dentry;
	return 0;
}

struct dentry *pvfs2_mount(struct file_system_type *fst,
			   int flags,
			   const char *devname,
			   void *data)
{
	int ret = -EINVAL;
	struct super_block *sb = ERR_PTR(-EINVAL);
	struct pvfs2_kernel_op_s *new_op;
	struct pvfs2_mount_sb_info_s mount_sb_info;
	struct dentry *mnt_sb_d = ERR_PTR(-EINVAL);

	gossip_debug(GOSSIP_SUPER_DEBUG,
		     "pvfs2_mount: called with devname %s\n",
		     devname);

	if (!devname) {
		gossip_err("ERROR: device name not specified.\n");
		return ERR_PTR(-EINVAL);
	}

	new_op = op_alloc(PVFS2_VFS_OP_FS_MOUNT);
	if (!new_op)
		return ERR_PTR(-ENOMEM);

	strncpy(new_op->upcall.req.fs_mount.pvfs2_config_server,
		devname,
		PVFS_MAX_SERVER_ADDR_LEN);

	gossip_debug(GOSSIP_SUPER_DEBUG,
		     "Attempting PVFS2 Mount via host %s\n",
		     new_op->upcall.req.fs_mount.pvfs2_config_server);

	ret = service_operation(new_op, "pvfs2_mount", 0);
	gossip_debug(GOSSIP_SUPER_DEBUG,
		     "pvfs2_mount: mount got return value of %d\n", ret);
	if (ret)
		goto free_op;

	if (new_op->downcall.resp.fs_mount.fs_id == PVFS_FS_ID_NULL) {
		gossip_err("ERROR: Retrieved null fs_id\n");
		ret = -EINVAL;
		goto free_op;
	}

	/* fill in temporary structure passed to fill_sb method */
	mount_sb_info.data = data;
	mount_sb_info.root_khandle =
		new_op->downcall.resp.fs_mount.root_khandle;
	mount_sb_info.fs_id = new_op->downcall.resp.fs_mount.fs_id;
	mount_sb_info.id = new_op->downcall.resp.fs_mount.id;

	/*
	 * the mount_sb_info structure looks odd, but it's used because
	 * the private sb info isn't allocated until we call
	 * pvfs2_fill_sb, yet we have the info we need to fill it with
	 * here.  so we store it temporarily and pass all of the info
	 * to fill_sb where it's properly copied out
	 */
	mnt_sb_d = mount_nodev(fst,
			       flags,
			       (void *)&mount_sb_info,
			       pvfs2_fill_sb);
	if (IS_ERR(mnt_sb_d)) {
		sb = ERR_CAST(mnt_sb_d);
		goto free_op;
	}

	sb = mnt_sb_d->d_sb;

	/*
	 * on successful mount, store the devname and data
	 * used
	 */
	strncpy(PVFS2_SB(sb)->devname,
		devname,
		PVFS_MAX_SERVER_ADDR_LEN);

	/* mount_pending must be cleared */
	PVFS2_SB(sb)->mount_pending = 0;

	/*
	 * finally, add this sb to our list of known pvfs2
	 * sb's
	 */
	add_pvfs2_sb(sb);
	op_release(new_op);
	return mnt_sb_d;

free_op:
	gossip_err("pvfs2_mount: mount request failed with %d\n", ret);
	if (ret == -EINVAL) {
		gossip_err("Ensure that all pvfs2-servers have the same FS configuration files\n");
		gossip_err("Look at pvfs2-client-core log file (typically /tmp/pvfs2-client.log) for more details\n");
	}

	op_release(new_op);

	gossip_debug(GOSSIP_SUPER_DEBUG,
		     "pvfs2_mount: returning dentry %p\n",
		     mnt_sb_d);
	return mnt_sb_d;
}

void pvfs2_kill_sb(struct super_block *sb)
{
	gossip_debug(GOSSIP_SUPER_DEBUG, "pvfs2_kill_sb: called\n");

	/*
	 * issue the unmount to userspace to tell it to remove the
	 * dynamic mount info it has for this superblock
	 */
	pvfs2_unmount_sb(sb);

	/* remove the sb from our list of pvfs2 specific sb's */
	remove_pvfs2_sb(sb);

	/* provided sb cleanup */
	kill_anon_super(sb);

	/* free the pvfs2 superblock private data */
	kfree(PVFS2_SB(sb));
}

int pvfs2_inode_cache_initialize(void)
{
	pvfs2_inode_cache = kmem_cache_create("pvfs2_inode_cache",
					      sizeof(struct pvfs2_inode_s),
					      0,
					      PVFS2_CACHE_CREATE_FLAGS,
					      pvfs2_inode_cache_ctor);

	if (!pvfs2_inode_cache) {
		gossip_err("Cannot create pvfs2_inode_cache\n");
		return -ENOMEM;
	}
	return 0;
}

int pvfs2_inode_cache_finalize(void)
{
	kmem_cache_destroy(pvfs2_inode_cache);
	return 0;
}
Commit	Line	Data
1182fca3 MM	1	/*
	2	* (C) 2001 Clemson University and The University of Chicago
	3	*
	4	* See COPYING in top-level directory.
	5	*/
	6
	7	#include "protocol.h"
	8	#include "pvfs2-kernel.h"
	9	#include "pvfs2-bufmap.h"
	10
	11	#include <linux/parser.h>
	12
	13	/* a cache for pvfs2-inode objects (i.e. pvfs2 inode private data) */
	14	static struct kmem_cache *pvfs2_inode_cache;
	15
	16	/* list for storing pvfs2 specific superblocks in use */
	17	LIST_HEAD(pvfs2_superblocks);
	18
	19	DEFINE_SPINLOCK(pvfs2_superblocks_lock);
	20
	21	enum {
	22	Opt_intr,
	23	Opt_acl,
	24	Opt_local_lock,
	25
	26	Opt_err
	27	};
	28
	29	static const match_table_t tokens = {
	30	{ Opt_acl, "acl" },
	31	{ Opt_intr, "intr" },
	32	{ Opt_local_lock, "local_lock" },
	33	{ Opt_err, NULL }
	34	};
	35
	36
	37	static int parse_mount_options(struct super_block sb, char options,
	38	int silent)
	39	{
	40	struct pvfs2_sb_info_s *pvfs2_sb = PVFS2_SB(sb);
	41	substring_t args[MAX_OPT_ARGS];
	42	char *p;
	43
	44	/*
	45	* Force any potential flags that might be set from the mount
	46	* to zero, ie, initialize to unset.
	47	*/
	48	sb->s_flags &= ~MS_POSIXACL;
	49	pvfs2_sb->flags &= ~PVFS2_OPT_INTR;
	50	pvfs2_sb->flags &= ~PVFS2_OPT_LOCAL_LOCK;
	51
	52	while ((p = strsep(&options, ",")) != NULL) {
	53	int token;
	54
	55	if (!*p)
	56	continue;
	57
	58	token = match_token(p, tokens, args);
	59	switch (token) {
	60	case Opt_acl:
	61	sb->s_flags \|= MS_POSIXACL;
	62	break;
	63	case Opt_intr:
	64	pvfs2_sb->flags \|= PVFS2_OPT_INTR;
65	break;
66	case Opt_local_lock:
67	pvfs2_sb->flags \|= PVFS2_OPT_LOCAL_LOCK;
68	break;
69	default:
70	goto fail;
71	}
72	}
73
74	return 0;
75	fail:
76	if (!silent)
77	gossip_err("Error: mount option [%s] is not supported.\n", p);
78	return -EINVAL;
79	}
80
81	static void pvfs2_inode_cache_ctor(void *req)
82	{
83	struct pvfs2_inode_s *pvfs2_inode = req;
84
85	inode_init_once(&pvfs2_inode->vfs_inode);
86	init_rwsem(&pvfs2_inode->xattr_sem);
87
88	pvfs2_inode->vfs_inode.i_version = 1;
89	}
90
91	static struct inode pvfs2_alloc_inode(struct super_block sb)
92	{
93	struct pvfs2_inode_s *pvfs2_inode;
94
95	pvfs2_inode = kmem_cache_alloc(pvfs2_inode_cache,
96	PVFS2_CACHE_ALLOC_FLAGS);
97	if (pvfs2_inode == NULL) {
98	gossip_err("Failed to allocate pvfs2_inode\n");
99	return NULL;
100	}
101
102	/*
103	* We want to clear everything except for rw_semaphore and the
104	* vfs_inode.
105	*/
106	memset(&pvfs2_inode->refn.khandle, 0, 16);
107	pvfs2_inode->refn.fs_id = PVFS_FS_ID_NULL;
108	pvfs2_inode->last_failed_block_index_read = 0;
109	memset(pvfs2_inode->link_target, 0, sizeof(pvfs2_inode->link_target));
110	pvfs2_inode->pinode_flags = 0;
111
112	gossip_debug(GOSSIP_SUPER_DEBUG,
113	"pvfs2_alloc_inode: allocated %p\n",
114	&pvfs2_inode->vfs_inode);
115	return &pvfs2_inode->vfs_inode;
116	}
117
118	static void pvfs2_destroy_inode(struct inode *inode)
119	{
120	struct pvfs2_inode_s *pvfs2_inode = PVFS2_I(inode);
121
122	gossip_debug(GOSSIP_SUPER_DEBUG,
123	"%s: deallocated %p destroying inode %pU\n",
124	__func__, pvfs2_inode, get_khandle_from_ino(inode));
125
126	kmem_cache_free(pvfs2_inode_cache, pvfs2_inode);
127	}
128
129	/*
130	* NOTE: information filled in here is typically reflected in the
131	* output of the system command 'df'
132	*/
133	static int pvfs2_statfs(struct dentry dentry, struct kstatfs buf)
134	{
135	int ret = -ENOMEM;
136	struct pvfs2_kernel_op_s *new_op = NULL;
137	int flags = 0;
138	struct super_block *sb = NULL;
139
140	sb = dentry->d_sb;
141
142	gossip_debug(GOSSIP_SUPER_DEBUG,
143	"pvfs2_statfs: called on sb %p (fs_id is %d)\n",
144	sb,
145	(int)(PVFS2_SB(sb)->fs_id));
146
147	new_op = op_alloc(PVFS2_VFS_OP_STATFS);
148	if (!new_op)
149	return ret;
150	new_op->upcall.req.statfs.fs_id = PVFS2_SB(sb)->fs_id;
151
152	if (PVFS2_SB(sb)->flags & PVFS2_OPT_INTR)
153	flags = PVFS2_OP_INTERRUPTIBLE;
154
155	ret = service_operation(new_op, "pvfs2_statfs", flags);
156
157	if (new_op->downcall.status < 0)
158	goto out_op_release;
159
160	gossip_debug(GOSSIP_SUPER_DEBUG,
161	"pvfs2_statfs: got %ld blocks available \| "
162	"%ld blocks total \| %ld block size\n",
163	(long)new_op->downcall.resp.statfs.blocks_avail,
164	(long)new_op->downcall.resp.statfs.blocks_total,
165	(long)new_op->downcall.resp.statfs.block_size);
166
167	buf->f_type = sb->s_magic;
168	memcpy(&buf->f_fsid, &PVFS2_SB(sb)->fs_id, sizeof(buf->f_fsid));
169	buf->f_bsize = new_op->downcall.resp.statfs.block_size;
170	buf->f_namelen = PVFS2_NAME_LEN;
171
172	buf->f_blocks = (sector_t) new_op->downcall.resp.statfs.blocks_total;
173	buf->f_bfree = (sector_t) new_op->downcall.resp.statfs.blocks_avail;
174	buf->f_bavail = (sector_t) new_op->downcall.resp.statfs.blocks_avail;
175	buf->f_files = (sector_t) new_op->downcall.resp.statfs.files_total;
176	buf->f_ffree = (sector_t) new_op->downcall.resp.statfs.files_avail;
177	buf->f_frsize = sb->s_blocksize;
178
179	out_op_release:
180	op_release(new_op);
181	gossip_debug(GOSSIP_SUPER_DEBUG, "pvfs2_statfs: returning %d\n", ret);
182	return ret;
183	}
184
185	/*
186	* Remount as initiated by VFS layer. We just need to reparse the mount
187	* options, no need to signal pvfs2-client-core about it.
188	*/
189	static int pvfs2_remount_fs(struct super_block sb, int flags, char *data)
190	{
191	gossip_debug(GOSSIP_SUPER_DEBUG, "pvfs2_remount_fs: called\n");
192	return parse_mount_options(sb, data, 1);
193	}
194
195	/*
196	* Remount as initiated by pvfs2-client-core on restart. This is used to
197	* repopulate mount information left from previous pvfs2-client-core.
198	*
199	* the idea here is that given a valid superblock, we're
200	* re-initializing the user space client with the initial mount
201	* information specified when the super block was first initialized.
202	* this is very different than the first initialization/creation of a
203	* superblock. we use the special service_priority_operation to make
204	* sure that the mount gets ahead of any other pending operation that
205	* is waiting for servicing. this means that the pvfs2-client won't
206	* fail to start several times for all other pending operations before
207	* the client regains all of the mount information from us.
208	* NOTE: this function assumes that the request_mutex is already acquired!
209	*/
210	int pvfs2_remount(struct super_block *sb)
211	{
212	struct pvfs2_kernel_op_s *new_op;
213	int ret = -EINVAL;
214
215	gossip_debug(GOSSIP_SUPER_DEBUG, "pvfs2_remount: called\n");
216
217	new_op = op_alloc(PVFS2_VFS_OP_FS_MOUNT);
218	if (!new_op)
219	return -ENOMEM;
220	strncpy(new_op->upcall.req.fs_mount.pvfs2_config_server,
221	PVFS2_SB(sb)->devname,
222	PVFS_MAX_SERVER_ADDR_LEN);
223
224	gossip_debug(GOSSIP_SUPER_DEBUG,
225	"Attempting PVFS2 Remount via host %s\n",
226	new_op->upcall.req.fs_mount.pvfs2_config_server);
227
228	/*
229	* we assume that the calling function has already acquire the
230	* request_mutex to prevent other operations from bypassing
231	* this one
232	*/
233	ret = service_operation(new_op, "pvfs2_remount",
234	PVFS2_OP_PRIORITY \| PVFS2_OP_NO_SEMAPHORE);
235	gossip_debug(GOSSIP_SUPER_DEBUG,
236	"pvfs2_remount: mount got return value of %d\n",
237	ret);
238	if (ret == 0) {
239	/*
240	* store the id assigned to this sb -- it's just a
241	* short-lived mapping that the system interface uses
242	* to map this superblock to a particular mount entry
243	*/
244	PVFS2_SB(sb)->id = new_op->downcall.resp.fs_mount.id;
245	PVFS2_SB(sb)->mount_pending = 0;
246	}
247
248	op_release(new_op);
249	return ret;
250	}
251
252	int fsid_key_table_initialize(void)
253	{
254	return 0;
255	}
256
257	void fsid_key_table_finalize(void)
258	{
259	}
260
261	/* Called whenever the VFS dirties the inode in response to atime updates */
262	static void pvfs2_dirty_inode(struct inode *inode, int flags)
263	{
264	struct pvfs2_inode_s *pvfs2_inode = PVFS2_I(inode);
265
266	gossip_debug(GOSSIP_SUPER_DEBUG,
267	"pvfs2_dirty_inode: %pU\n",
268	get_khandle_from_ino(inode));
269	SetAtimeFlag(pvfs2_inode);
270	}
271
272	struct super_operations pvfs2_s_ops = {
273	.alloc_inode = pvfs2_alloc_inode,
274	.destroy_inode = pvfs2_destroy_inode,
275	.dirty_inode = pvfs2_dirty_inode,
276	.drop_inode = generic_delete_inode,
277	.statfs = pvfs2_statfs,
278	.remount_fs = pvfs2_remount_fs,
279	.show_options = generic_show_options,
280	};
281
282	struct dentry pvfs2_fh_to_dentry(struct super_block sb,
283	struct fid *fid,
284	int fh_len,
285	int fh_type)
286	{
287	struct pvfs2_object_kref refn;
288
289	if (fh_len < 5 \|\| fh_type > 2)
290	return NULL;
291
292	PVFS_khandle_from(&(refn.khandle), fid->raw, 16);
293	refn.fs_id = (u32) fid->raw[4];
294	gossip_debug(GOSSIP_SUPER_DEBUG,
295	"fh_to_dentry: handle %pU, fs_id %d\n",
296	&refn.khandle,
297	refn.fs_id);
298
299	return d_obtain_alias(pvfs2_iget(sb, &refn));
300	}
301
302	int pvfs2_encode_fh(struct inode *inode,
303	__u32 *fh,
304	int *max_len,
305	struct inode *parent)
306	{
307	int len = parent ? 10 : 5;
308	int type = 1;
309	struct pvfs2_object_kref refn;
310
311	if (*max_len < len) {
312	gossip_lerr("fh buffer is too small for encoding\n");
313	*max_len = len;
314	type = 255;
315	goto out;
316	}
317
318	refn = PVFS2_I(inode)->refn;
319	PVFS_khandle_to(&refn.khandle, fh, 16);
320	fh[4] = refn.fs_id;
321
322	gossip_debug(GOSSIP_SUPER_DEBUG,
323	"Encoding fh: handle %pU, fsid %u\n",
324	&refn.khandle,
325	refn.fs_id);
326
327
328	if (parent) {
329	refn = PVFS2_I(parent)->refn;
330	PVFS_khandle_to(&refn.khandle, (char *) fh + 20, 16);
331	fh[9] = refn.fs_id;
332
333	type = 2;
334	gossip_debug(GOSSIP_SUPER_DEBUG,
335	"Encoding parent: handle %pU, fsid %u\n",
336	&refn.khandle,
337	refn.fs_id);
338	}
339	*max_len = len;
340
341	out:
342	return type;
343	}
344
345	static struct export_operations pvfs2_export_ops = {
346	.encode_fh = pvfs2_encode_fh,
347	.fh_to_dentry = pvfs2_fh_to_dentry,
348	};
349
350	int pvfs2_fill_sb(struct super_block sb, void data, int silent)
351	{
352	int ret = -EINVAL;
353	struct inode *root = NULL;
354	struct dentry *root_dentry = NULL;
355	struct pvfs2_mount_sb_info_s *mount_sb_info =
356	(struct pvfs2_mount_sb_info_s *) data;
357	struct pvfs2_object_kref root_object;
358
359	/* alloc and init our private pvfs2 sb info */
360	sb->s_fs_info =
361	kmalloc(sizeof(struct pvfs2_sb_info_s), PVFS2_GFP_FLAGS);
362	if (!PVFS2_SB(sb))
363	return -ENOMEM;
364	memset(sb->s_fs_info, 0, sizeof(struct pvfs2_sb_info_s));
365	PVFS2_SB(sb)->sb = sb;
366
367	PVFS2_SB(sb)->root_khandle = mount_sb_info->root_khandle;
368	PVFS2_SB(sb)->fs_id = mount_sb_info->fs_id;
369	PVFS2_SB(sb)->id = mount_sb_info->id;
370
371	if (mount_sb_info->data) {
372	ret = parse_mount_options(sb, mount_sb_info->data,
373	silent);
374	if (ret)
375	return ret;
376	}
377
378	/* Hang the xattr handlers off the superblock */
379	sb->s_xattr = pvfs2_xattr_handlers;
380	sb->s_magic = PVFS2_SUPER_MAGIC;
381	sb->s_op = &pvfs2_s_ops;
382	sb->s_d_op = &pvfs2_dentry_operations;
383
384	sb->s_blocksize = pvfs_bufmap_size_query();
385	sb->s_blocksize_bits = pvfs_bufmap_shift_query();
386	sb->s_maxbytes = MAX_LFS_FILESIZE;
387
388	root_object.khandle = PVFS2_SB(sb)->root_khandle;
389	root_object.fs_id = PVFS2_SB(sb)->fs_id;
390	gossip_debug(GOSSIP_SUPER_DEBUG,
391	"get inode %pU, fsid %d\n",
392	&root_object.khandle,
393	root_object.fs_id);
394
395	root = pvfs2_iget(sb, &root_object);
396	if (IS_ERR(root))
397	return PTR_ERR(root);
398
399	gossip_debug(GOSSIP_SUPER_DEBUG,
400	"Allocated root inode [%p] with mode %x\n",
401	root,
402	root->i_mode);
403
404	/* allocates and places root dentry in dcache */
405	root_dentry = d_make_root(root);
406	if (!root_dentry) {
407	iput(root);
408	return -ENOMEM;
409	}
410
411	sb->s_export_op = &pvfs2_export_ops;
412	sb->s_root = root_dentry;
413	return 0;
414	}
415
416	struct dentry pvfs2_mount(struct file_system_type fst,
417	int flags,
418	const char *devname,
419	void *data)
420	{
421	int ret = -EINVAL;
422	struct super_block *sb = ERR_PTR(-EINVAL);
423	struct pvfs2_kernel_op_s *new_op;
424	struct pvfs2_mount_sb_info_s mount_sb_info;
425	struct dentry *mnt_sb_d = ERR_PTR(-EINVAL);
426
427	gossip_debug(GOSSIP_SUPER_DEBUG,
428	"pvfs2_mount: called with devname %s\n",
429	devname);
430
431	if (!devname) {
432	gossip_err("ERROR: device name not specified.\n");
433	return ERR_PTR(-EINVAL);
434	}
435
436	new_op = op_alloc(PVFS2_VFS_OP_FS_MOUNT);
437	if (!new_op)
438	return ERR_PTR(-ENOMEM);
439
440	strncpy(new_op->upcall.req.fs_mount.pvfs2_config_server,
441	devname,
442	PVFS_MAX_SERVER_ADDR_LEN);
443
444	gossip_debug(GOSSIP_SUPER_DEBUG,
445	"Attempting PVFS2 Mount via host %s\n",
446	new_op->upcall.req.fs_mount.pvfs2_config_server);
447
448	ret = service_operation(new_op, "pvfs2_mount", 0);
449	gossip_debug(GOSSIP_SUPER_DEBUG,
450	"pvfs2_mount: mount got return value of %d\n", ret);
451	if (ret)
452	goto free_op;
453
454	if (new_op->downcall.resp.fs_mount.fs_id == PVFS_FS_ID_NULL) {
455	gossip_err("ERROR: Retrieved null fs_id\n");
456	ret = -EINVAL;
457	goto free_op;
458	}
459
460	/* fill in temporary structure passed to fill_sb method */
461	mount_sb_info.data = data;
462	mount_sb_info.root_khandle =
463	new_op->downcall.resp.fs_mount.root_khandle;
464	mount_sb_info.fs_id = new_op->downcall.resp.fs_mount.fs_id;
465	mount_sb_info.id = new_op->downcall.resp.fs_mount.id;
466
467	/*
468	* the mount_sb_info structure looks odd, but it's used because
469	* the private sb info isn't allocated until we call
470	* pvfs2_fill_sb, yet we have the info we need to fill it with
471	* here. so we store it temporarily and pass all of the info
472	* to fill_sb where it's properly copied out
473	*/
474	mnt_sb_d = mount_nodev(fst,
475	flags,
476	(void *)&mount_sb_info,
477	pvfs2_fill_sb);
478	if (IS_ERR(mnt_sb_d)) {
479	sb = ERR_CAST(mnt_sb_d);
480	goto free_op;
481	}
482
483	sb = mnt_sb_d->d_sb;
484
485	/*
486	* on successful mount, store the devname and data
487	* used
488	*/
489	strncpy(PVFS2_SB(sb)->devname,
490	devname,
491	PVFS_MAX_SERVER_ADDR_LEN);
492
493	/* mount_pending must be cleared */
494	PVFS2_SB(sb)->mount_pending = 0;
495
496	/*
497	* finally, add this sb to our list of known pvfs2
498	* sb's
499	*/
500	add_pvfs2_sb(sb);
501	op_release(new_op);
502	return mnt_sb_d;
503
504	free_op:
505	gossip_err("pvfs2_mount: mount request failed with %d\n", ret);
506	if (ret == -EINVAL) {
507	gossip_err("Ensure that all pvfs2-servers have the same FS configuration files\n");
508	gossip_err("Look at pvfs2-client-core log file (typically /tmp/pvfs2-client.log) for more details\n");
509	}
510
511	op_release(new_op);
512
513	gossip_debug(GOSSIP_SUPER_DEBUG,
514	"pvfs2_mount: returning dentry %p\n",
515	mnt_sb_d);
516	return mnt_sb_d;
517	}
518
519	void pvfs2_kill_sb(struct super_block *sb)
520	{
521	gossip_debug(GOSSIP_SUPER_DEBUG, "pvfs2_kill_sb: called\n");
522
523	/*
524	* issue the unmount to userspace to tell it to remove the
525	* dynamic mount info it has for this superblock
526	*/
527	pvfs2_unmount_sb(sb);
528
529	/* remove the sb from our list of pvfs2 specific sb's */
530	remove_pvfs2_sb(sb);
531
532	/* provided sb cleanup */
533	kill_anon_super(sb);
534
535	/* free the pvfs2 superblock private data */
536	kfree(PVFS2_SB(sb));
537	}
538
539	int pvfs2_inode_cache_initialize(void)
540	{
541	pvfs2_inode_cache = kmem_cache_create("pvfs2_inode_cache",
542	sizeof(struct pvfs2_inode_s),
543	0,
544	PVFS2_CACHE_CREATE_FLAGS,
545	pvfs2_inode_cache_ctor);
546
547	if (!pvfs2_inode_cache) {
548	gossip_err("Cannot create pvfs2_inode_cache\n");
549	return -ENOMEM;
550	}
551	return 0;
552	}
553
554	int pvfs2_inode_cache_finalize(void)
555	{
556	kmem_cache_destroy(pvfs2_inode_cache);
557	return 0;
558	}