inode.c 62.3 KB
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/*
 *  linux/fs/nfs/inode.c
 *
 *  Copyright (C) 1992  Rick Sladkey
 *
 *  nfs inode and superblock handling functions
 *
 *  Modularised by Alan Cox <Alan.Cox@linux.org>, while hacking some
 *  experimental NFS changes. Modularisation taken straight from SYS5 fs.
 *
 *  Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
 *  J.S.Peatfield@damtp.cam.ac.uk
 *
 */

#include <linux/config.h>
#include <linux/module.h>
#include <linux/init.h>

#include <linux/time.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/string.h>
#include <linux/stat.h>
#include <linux/errno.h>
#include <linux/unistd.h>
#include <linux/sunrpc/clnt.h>
#include <linux/sunrpc/stats.h>
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#include <linux/sunrpc/metrics.h>
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#include <linux/nfs_fs.h>
#include <linux/nfs_mount.h>
#include <linux/nfs4_mount.h>
#include <linux/lockd/bind.h>
#include <linux/smp_lock.h>
#include <linux/seq_file.h>
#include <linux/mount.h>
#include <linux/nfs_idmap.h>
#include <linux/vfs.h>

#include <asm/system.h>
#include <asm/uaccess.h>

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#include "nfs4_fs.h"
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#include "callback.h"
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#include "delegation.h"
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#include "iostat.h"
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#define NFSDBG_FACILITY		NFSDBG_VFS
#define NFS_PARANOIA 1

/* Maximum number of readahead requests
 * FIXME: this should really be a sysctl so that users may tune it to suit
 *        their needs. People that do NFS over a slow network, might for
 *        instance want to reduce it to something closer to 1 for improved
 *        interactive response.
 */
#define NFS_MAX_READAHEAD	(RPC_DEF_SLOT_TABLE - 1)

static void nfs_invalidate_inode(struct inode *);
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static int nfs_update_inode(struct inode *, struct nfs_fattr *);
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static struct inode *nfs_alloc_inode(struct super_block *sb);
static void nfs_destroy_inode(struct inode *);
static int nfs_write_inode(struct inode *,int);
static void nfs_delete_inode(struct inode *);
static void nfs_clear_inode(struct inode *);
static void nfs_umount_begin(struct super_block *);
static int  nfs_statfs(struct super_block *, struct kstatfs *);
static int  nfs_show_options(struct seq_file *, struct vfsmount *);
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static int  nfs_show_stats(struct seq_file *, struct vfsmount *);
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static void nfs_zap_acl_cache(struct inode *);
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static struct rpc_program	nfs_program;

static struct super_operations nfs_sops = { 
	.alloc_inode	= nfs_alloc_inode,
	.destroy_inode	= nfs_destroy_inode,
	.write_inode	= nfs_write_inode,
	.delete_inode	= nfs_delete_inode,
	.statfs		= nfs_statfs,
	.clear_inode	= nfs_clear_inode,
	.umount_begin	= nfs_umount_begin,
	.show_options	= nfs_show_options,
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	.show_stats	= nfs_show_stats,
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};

/*
 * RPC cruft for NFS
 */
static struct rpc_stat		nfs_rpcstat = {
	.program		= &nfs_program
};
static struct rpc_version *	nfs_version[] = {
	NULL,
	NULL,
	&nfs_version2,
#if defined(CONFIG_NFS_V3)
	&nfs_version3,
#elif defined(CONFIG_NFS_V4)
	NULL,
#endif
#if defined(CONFIG_NFS_V4)
	&nfs_version4,
#endif
};

static struct rpc_program	nfs_program = {
	.name			= "nfs",
	.number			= NFS_PROGRAM,
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	.nrvers			= ARRAY_SIZE(nfs_version),
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	.version		= nfs_version,
	.stats			= &nfs_rpcstat,
	.pipe_dir_name		= "/nfs",
};

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#ifdef CONFIG_NFS_V3_ACL
static struct rpc_stat		nfsacl_rpcstat = { &nfsacl_program };
static struct rpc_version *	nfsacl_version[] = {
	[3]			= &nfsacl_version3,
};

struct rpc_program		nfsacl_program = {
	.name =			"nfsacl",
	.number =		NFS_ACL_PROGRAM,
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	.nrvers =		ARRAY_SIZE(nfsacl_version),
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	.version =		nfsacl_version,
	.stats =		&nfsacl_rpcstat,
};
#endif  /* CONFIG_NFS_V3_ACL */

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static inline unsigned long
nfs_fattr_to_ino_t(struct nfs_fattr *fattr)
{
	return nfs_fileid_to_ino_t(fattr->fileid);
}

static int
nfs_write_inode(struct inode *inode, int sync)
{
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	int flags = sync ? FLUSH_SYNC : 0;
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	int ret;

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	ret = nfs_commit_inode(inode, flags);
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	if (ret < 0)
		return ret;
	return 0;
}

static void
nfs_delete_inode(struct inode * inode)
{
	dprintk("NFS: delete_inode(%s/%ld)\n", inode->i_sb->s_id, inode->i_ino);

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	truncate_inode_pages(&inode->i_data, 0);

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	nfs_wb_all(inode);
	/*
	 * The following should never happen...
	 */
	if (nfs_have_writebacks(inode)) {
		printk(KERN_ERR "nfs_delete_inode: inode %ld has pending RPC requests\n", inode->i_ino);
	}

	clear_inode(inode);
}

static void
nfs_clear_inode(struct inode *inode)
{
	struct nfs_inode *nfsi = NFS_I(inode);
	struct rpc_cred *cred;

	nfs_wb_all(inode);
	BUG_ON (!list_empty(&nfsi->open_files));
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	nfs_zap_acl_cache(inode);
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	cred = nfsi->cache_access.cred;
	if (cred)
		put_rpccred(cred);
	BUG_ON(atomic_read(&nfsi->data_updates) != 0);
}

void
nfs_umount_begin(struct super_block *sb)
{
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	struct rpc_clnt	*rpc = NFS_SB(sb)->client;
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	/* -EIO all pending I/O */
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	if (!IS_ERR(rpc))
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		rpc_killall_tasks(rpc);
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	rpc = NFS_SB(sb)->client_acl;
	if (!IS_ERR(rpc))
		rpc_killall_tasks(rpc);
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}


static inline unsigned long
nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
{
	/* make sure blocksize is a power of two */
	if ((bsize & (bsize - 1)) || nrbitsp) {
		unsigned char	nrbits;

		for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
			;
		bsize = 1 << nrbits;
		if (nrbitsp)
			*nrbitsp = nrbits;
	}

	return bsize;
}

/*
 * Calculate the number of 512byte blocks used.
 */
static inline unsigned long
nfs_calc_block_size(u64 tsize)
{
	loff_t used = (tsize + 511) >> 9;
	return (used > ULONG_MAX) ? ULONG_MAX : used;
}

/*
 * Compute and set NFS server blocksize
 */
static inline unsigned long
nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
{
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	if (bsize < NFS_MIN_FILE_IO_SIZE)
		bsize = NFS_DEF_FILE_IO_SIZE;
	else if (bsize >= NFS_MAX_FILE_IO_SIZE)
		bsize = NFS_MAX_FILE_IO_SIZE;
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	return nfs_block_bits(bsize, nrbitsp);
}

/*
 * Obtain the root inode of the file system.
 */
static struct inode *
nfs_get_root(struct super_block *sb, struct nfs_fh *rootfh, struct nfs_fsinfo *fsinfo)
{
	struct nfs_server	*server = NFS_SB(sb);
	int			error;

	error = server->rpc_ops->getroot(server, rootfh, fsinfo);
	if (error < 0) {
		dprintk("nfs_get_root: getattr error = %d\n", -error);
		return ERR_PTR(error);
	}

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	return nfs_fhget(sb, rootfh, fsinfo->fattr);
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}

/*
 * Do NFS version-independent mount processing, and sanity checking
 */
static int
nfs_sb_init(struct super_block *sb, rpc_authflavor_t authflavor)
{
	struct nfs_server	*server;
	struct inode		*root_inode;
	struct nfs_fattr	fattr;
	struct nfs_fsinfo	fsinfo = {
					.fattr = &fattr,
				};
	struct nfs_pathconf pathinfo = {
			.fattr = &fattr,
	};
	int no_root_error = 0;
	unsigned long max_rpc_payload;

	/* We probably want something more informative here */
	snprintf(sb->s_id, sizeof(sb->s_id), "%x:%x", MAJOR(sb->s_dev), MINOR(sb->s_dev));

	server = NFS_SB(sb);

	sb->s_magic      = NFS_SUPER_MAGIC;

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	server->io_stats = nfs_alloc_iostats();
	if (server->io_stats == NULL)
		return -ENOMEM;

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	root_inode = nfs_get_root(sb, &server->fh, &fsinfo);
	/* Did getting the root inode fail? */
	if (IS_ERR(root_inode)) {
		no_root_error = PTR_ERR(root_inode);
		goto out_no_root;
	}
	sb->s_root = d_alloc_root(root_inode);
	if (!sb->s_root) {
		no_root_error = -ENOMEM;
		goto out_no_root;
	}
	sb->s_root->d_op = server->rpc_ops->dentry_ops;

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	/* mount time stamp, in seconds */
	server->mount_time = jiffies;

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	/* Get some general file system info */
	if (server->namelen == 0 &&
	    server->rpc_ops->pathconf(server, &server->fh, &pathinfo) >= 0)
		server->namelen = pathinfo.max_namelen;
	/* Work out a lot of parameters */
	if (server->rsize == 0)
		server->rsize = nfs_block_size(fsinfo.rtpref, NULL);
	if (server->wsize == 0)
		server->wsize = nfs_block_size(fsinfo.wtpref, NULL);

	if (fsinfo.rtmax >= 512 && server->rsize > fsinfo.rtmax)
		server->rsize = nfs_block_size(fsinfo.rtmax, NULL);
	if (fsinfo.wtmax >= 512 && server->wsize > fsinfo.wtmax)
		server->wsize = nfs_block_size(fsinfo.wtmax, NULL);

	max_rpc_payload = nfs_block_size(rpc_max_payload(server->client), NULL);
	if (server->rsize > max_rpc_payload)
		server->rsize = max_rpc_payload;
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	if (server->rsize > NFS_MAX_FILE_IO_SIZE)
		server->rsize = NFS_MAX_FILE_IO_SIZE;
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	server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;

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	if (server->wsize > max_rpc_payload)
		server->wsize = max_rpc_payload;
	if (server->wsize > NFS_MAX_FILE_IO_SIZE)
		server->wsize = NFS_MAX_FILE_IO_SIZE;
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	server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;

	if (sb->s_blocksize == 0)
		sb->s_blocksize = nfs_block_bits(server->wsize,
							 &sb->s_blocksize_bits);
	server->wtmult = nfs_block_bits(fsinfo.wtmult, NULL);

	server->dtsize = nfs_block_size(fsinfo.dtpref, NULL);
	if (server->dtsize > PAGE_CACHE_SIZE)
		server->dtsize = PAGE_CACHE_SIZE;
	if (server->dtsize > server->rsize)
		server->dtsize = server->rsize;

	if (server->flags & NFS_MOUNT_NOAC) {
		server->acregmin = server->acregmax = 0;
		server->acdirmin = server->acdirmax = 0;
		sb->s_flags |= MS_SYNCHRONOUS;
	}
	server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD;

	sb->s_maxbytes = fsinfo.maxfilesize;
	if (sb->s_maxbytes > MAX_LFS_FILESIZE) 
		sb->s_maxbytes = MAX_LFS_FILESIZE; 

	server->client->cl_intr = (server->flags & NFS_MOUNT_INTR) ? 1 : 0;
	server->client->cl_softrtry = (server->flags & NFS_MOUNT_SOFT) ? 1 : 0;

	/* We're airborne Set socket buffersize */
	rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
	return 0;
	/* Yargs. It didn't work out. */
out_no_root:
	dprintk("nfs_sb_init: get root inode failed: errno %d\n", -no_root_error);
	if (!IS_ERR(root_inode))
		iput(root_inode);
	return no_root_error;
}

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static void nfs_init_timeout_values(struct rpc_timeout *to, int proto, unsigned int timeo, unsigned int retrans)
{
	to->to_initval = timeo * HZ / 10;
	to->to_retries = retrans;
	if (!to->to_retries)
		to->to_retries = 2;

	switch (proto) {
	case IPPROTO_TCP:
		if (!to->to_initval)
			to->to_initval = 60 * HZ;
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		if (to->to_initval > NFS_MAX_TCP_TIMEOUT)
			to->to_initval = NFS_MAX_TCP_TIMEOUT;
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		to->to_increment = to->to_initval;
		to->to_maxval = to->to_initval + (to->to_increment * to->to_retries);
		to->to_exponential = 0;
		break;
	case IPPROTO_UDP:
	default:
		if (!to->to_initval)
			to->to_initval = 11 * HZ / 10;
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		if (to->to_initval > NFS_MAX_UDP_TIMEOUT)
			to->to_initval = NFS_MAX_UDP_TIMEOUT;
		to->to_maxval = NFS_MAX_UDP_TIMEOUT;
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		to->to_exponential = 1;
		break;
	}
}

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/*
 * Create an RPC client handle.
 */
static struct rpc_clnt *
nfs_create_client(struct nfs_server *server, const struct nfs_mount_data *data)
{
	struct rpc_timeout	timeparms;
	struct rpc_xprt		*xprt = NULL;
	struct rpc_clnt		*clnt = NULL;
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	int			proto = (data->flags & NFS_MOUNT_TCP) ? IPPROTO_TCP : IPPROTO_UDP;
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	nfs_init_timeout_values(&timeparms, proto, data->timeo, data->retrans);
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	server->retrans_timeo = timeparms.to_initval;
	server->retrans_count = timeparms.to_retries;

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	/* create transport and client */
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	xprt = xprt_create_proto(proto, &server->addr, &timeparms);
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	if (IS_ERR(xprt)) {
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		dprintk("%s: cannot create RPC transport. Error = %ld\n",
				__FUNCTION__, PTR_ERR(xprt));
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		return (struct rpc_clnt *)xprt;
	}
	clnt = rpc_create_client(xprt, server->hostname, &nfs_program,
				 server->rpc_ops->version, data->pseudoflavor);
	if (IS_ERR(clnt)) {
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		dprintk("%s: cannot create RPC client. Error = %ld\n",
				__FUNCTION__, PTR_ERR(xprt));
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		goto out_fail;
	}

	clnt->cl_intr     = 1;
	clnt->cl_softrtry = 1;

	return clnt;

out_fail:
	return clnt;
}

/*
 * The way this works is that the mount process passes a structure
 * in the data argument which contains the server's IP address
 * and the root file handle obtained from the server's mount
 * daemon. We stash these away in the private superblock fields.
 */
static int
nfs_fill_super(struct super_block *sb, struct nfs_mount_data *data, int silent)
{
	struct nfs_server	*server;
	rpc_authflavor_t	authflavor;

	server           = NFS_SB(sb);
	sb->s_blocksize_bits = 0;
	sb->s_blocksize = 0;
	if (data->bsize)
		sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
	if (data->rsize)
		server->rsize = nfs_block_size(data->rsize, NULL);
	if (data->wsize)
		server->wsize = nfs_block_size(data->wsize, NULL);
	server->flags    = data->flags & NFS_MOUNT_FLAGMASK;

	server->acregmin = data->acregmin*HZ;
	server->acregmax = data->acregmax*HZ;
	server->acdirmin = data->acdirmin*HZ;
	server->acdirmax = data->acdirmax*HZ;

	/* Start lockd here, before we might error out */
	if (!(server->flags & NFS_MOUNT_NONLM))
		lockd_up();

	server->namelen  = data->namlen;
	server->hostname = kmalloc(strlen(data->hostname) + 1, GFP_KERNEL);
	if (!server->hostname)
		return -ENOMEM;
	strcpy(server->hostname, data->hostname);

	/* Check NFS protocol revision and initialize RPC op vector
	 * and file handle pool. */
#ifdef CONFIG_NFS_V3
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	if (server->flags & NFS_MOUNT_VER3) {
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		server->rpc_ops = &nfs_v3_clientops;
		server->caps |= NFS_CAP_READDIRPLUS;
	} else {
		server->rpc_ops = &nfs_v2_clientops;
	}
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#else
	server->rpc_ops = &nfs_v2_clientops;
#endif
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	/* Fill in pseudoflavor for mount version < 5 */
	if (!(data->flags & NFS_MOUNT_SECFLAVOUR))
		data->pseudoflavor = RPC_AUTH_UNIX;
	authflavor = data->pseudoflavor;	/* save for sb_init() */
	/* XXX maybe we want to add a server->pseudoflavor field */

	/* Create RPC client handles */
	server->client = nfs_create_client(server, data);
	if (IS_ERR(server->client))
		return PTR_ERR(server->client);
	/* RFC 2623, sec 2.3.2 */
	if (authflavor != RPC_AUTH_UNIX) {
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		struct rpc_auth *auth;

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		server->client_sys = rpc_clone_client(server->client);
		if (IS_ERR(server->client_sys))
			return PTR_ERR(server->client_sys);
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		auth = rpcauth_create(RPC_AUTH_UNIX, server->client_sys);
		if (IS_ERR(auth))
			return PTR_ERR(auth);
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	} else {
		atomic_inc(&server->client->cl_count);
		server->client_sys = server->client;
	}
	if (server->flags & NFS_MOUNT_VER3) {
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#ifdef CONFIG_NFS_V3_ACL
		if (!(server->flags & NFS_MOUNT_NOACL)) {
			server->client_acl = rpc_bind_new_program(server->client, &nfsacl_program, 3);
			/* No errors! Assume that Sun nfsacls are supported */
			if (!IS_ERR(server->client_acl))
				server->caps |= NFS_CAP_ACLS;
		}
#else
		server->flags &= ~NFS_MOUNT_NOACL;
#endif /* CONFIG_NFS_V3_ACL */
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		/*
		 * The VFS shouldn't apply the umask to mode bits. We will
		 * do so ourselves when necessary.
		 */
		sb->s_flags |= MS_POSIXACL;
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		if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
			server->namelen = NFS3_MAXNAMLEN;
		sb->s_time_gran = 1;
	} else {
		if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
			server->namelen = NFS2_MAXNAMLEN;
	}

	sb->s_op = &nfs_sops;
	return nfs_sb_init(sb, authflavor);
}

static int
nfs_statfs(struct super_block *sb, struct kstatfs *buf)
{
	struct nfs_server *server = NFS_SB(sb);
	unsigned char blockbits;
	unsigned long blockres;
	struct nfs_fh *rootfh = NFS_FH(sb->s_root->d_inode);
	struct nfs_fattr fattr;
	struct nfs_fsstat res = {
			.fattr = &fattr,
	};
	int error;

	lock_kernel();

	error = server->rpc_ops->statfs(server, rootfh, &res);
	buf->f_type = NFS_SUPER_MAGIC;
	if (error < 0)
		goto out_err;

	/*
	 * Current versions of glibc do not correctly handle the
	 * case where f_frsize != f_bsize.  Eventually we want to
	 * report the value of wtmult in this field.
	 */
	buf->f_frsize = sb->s_blocksize;

	/*
	 * On most *nix systems, f_blocks, f_bfree, and f_bavail
	 * are reported in units of f_frsize.  Linux hasn't had
	 * an f_frsize field in its statfs struct until recently,
	 * thus historically Linux's sys_statfs reports these
	 * fields in units of f_bsize.
	 */
	buf->f_bsize = sb->s_blocksize;
	blockbits = sb->s_blocksize_bits;
	blockres = (1 << blockbits) - 1;
	buf->f_blocks = (res.tbytes + blockres) >> blockbits;
	buf->f_bfree = (res.fbytes + blockres) >> blockbits;
	buf->f_bavail = (res.abytes + blockres) >> blockbits;

	buf->f_files = res.tfiles;
	buf->f_ffree = res.afiles;

	buf->f_namelen = server->namelen;
 out:
	unlock_kernel();
	return 0;

 out_err:
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	dprintk("%s: statfs error = %d\n", __FUNCTION__, -error);
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	buf->f_bsize = buf->f_blocks = buf->f_bfree = buf->f_bavail = -1;
	goto out;

}

592
static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, int showdefaults)
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{
	static struct proc_nfs_info {
		int flag;
		char *str;
		char *nostr;
	} nfs_info[] = {
		{ NFS_MOUNT_SOFT, ",soft", ",hard" },
		{ NFS_MOUNT_INTR, ",intr", "" },
		{ NFS_MOUNT_NOCTO, ",nocto", "" },
		{ NFS_MOUNT_NOAC, ",noac", "" },
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		{ NFS_MOUNT_NONLM, ",nolock", "" },
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		{ NFS_MOUNT_NOACL, ",noacl", "" },
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		{ 0, NULL, NULL }
	};
	struct proc_nfs_info *nfs_infop;
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	char buf[12];
	char *proto;
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	seq_printf(m, ",vers=%d", nfss->rpc_ops->version);
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	seq_printf(m, ",rsize=%d", nfss->rsize);
	seq_printf(m, ",wsize=%d", nfss->wsize);
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	if (nfss->acregmin != 3*HZ || showdefaults)
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		seq_printf(m, ",acregmin=%d", nfss->acregmin/HZ);
616
	if (nfss->acregmax != 60*HZ || showdefaults)
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		seq_printf(m, ",acregmax=%d", nfss->acregmax/HZ);
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	if (nfss->acdirmin != 30*HZ || showdefaults)
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		seq_printf(m, ",acdirmin=%d", nfss->acdirmin/HZ);
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	if (nfss->acdirmax != 60*HZ || showdefaults)
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		seq_printf(m, ",acdirmax=%d", nfss->acdirmax/HZ);
	for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) {
		if (nfss->flags & nfs_infop->flag)
			seq_puts(m, nfs_infop->str);
		else
			seq_puts(m, nfs_infop->nostr);
	}
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	switch (nfss->client->cl_xprt->prot) {
		case IPPROTO_TCP:
			proto = "tcp";
			break;
		case IPPROTO_UDP:
			proto = "udp";
			break;
		default:
			snprintf(buf, sizeof(buf), "%u", nfss->client->cl_xprt->prot);
			proto = buf;
	}
	seq_printf(m, ",proto=%s", proto);
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	seq_printf(m, ",timeo=%lu", 10U * nfss->retrans_timeo / HZ);
	seq_printf(m, ",retrans=%u", nfss->retrans_count);
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}

static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
{
	struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);

	nfs_show_mount_options(m, nfss, 0);

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	seq_puts(m, ",addr=");
	seq_escape(m, nfss->hostname, " \t\n\\");
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	return 0;
}

static int nfs_show_stats(struct seq_file *m, struct vfsmount *mnt)
{
	int i, cpu;
	struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
	struct rpc_auth *auth = nfss->client->cl_auth;
	struct nfs_iostats totals = { };

	seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS);

	/*
	 * Display all mount option settings
	 */
	seq_printf(m, "\n\topts:\t");
	seq_puts(m, mnt->mnt_sb->s_flags & MS_RDONLY ? "ro" : "rw");
	seq_puts(m, mnt->mnt_sb->s_flags & MS_SYNCHRONOUS ? ",sync" : "");
	seq_puts(m, mnt->mnt_sb->s_flags & MS_NOATIME ? ",noatime" : "");
	seq_puts(m, mnt->mnt_sb->s_flags & MS_NODIRATIME ? ",nodiratime" : "");
	nfs_show_mount_options(m, nfss, 1);

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	seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ);

677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702
	seq_printf(m, "\n\tcaps:\t");
	seq_printf(m, "caps=0x%x", nfss->caps);
	seq_printf(m, ",wtmult=%d", nfss->wtmult);
	seq_printf(m, ",dtsize=%d", nfss->dtsize);
	seq_printf(m, ",bsize=%d", nfss->bsize);
	seq_printf(m, ",namelen=%d", nfss->namelen);

#ifdef CONFIG_NFS_V4
	if (nfss->rpc_ops->version == 4) {
		seq_printf(m, "\n\tnfsv4:\t");
		seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]);
		seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]);
		seq_printf(m, ",acl=0x%x", nfss->acl_bitmask);
	}
#endif

	/*
	 * Display security flavor in effect for this mount
	 */
	seq_printf(m, "\n\tsec:\tflavor=%d", auth->au_ops->au_flavor);
	if (auth->au_flavor)
		seq_printf(m, ",pseudoflavor=%d", auth->au_flavor);

	/*
	 * Display superblock I/O counters
	 */
703
	for_each_possible_cpu(cpu) {
704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722
		struct nfs_iostats *stats;

		preempt_disable();
		stats = per_cpu_ptr(nfss->io_stats, cpu);

		for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
			totals.events[i] += stats->events[i];
		for (i = 0; i < __NFSIOS_BYTESMAX; i++)
			totals.bytes[i] += stats->bytes[i];

		preempt_enable();
	}

	seq_printf(m, "\n\tevents:\t");
	for (i = 0; i < __NFSIOS_COUNTSMAX; i++)
		seq_printf(m, "%lu ", totals.events[i]);
	seq_printf(m, "\n\tbytes:\t");
	for (i = 0; i < __NFSIOS_BYTESMAX; i++)
		seq_printf(m, "%Lu ", totals.bytes[i]);
723 724 725
	seq_printf(m, "\n");

	rpc_print_iostats(m, nfss->client);
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	return 0;
}

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/**
 * nfs_sync_mapping - helper to flush all mmapped dirty data to disk
 */
int nfs_sync_mapping(struct address_space *mapping)
{
	int ret;

	if (mapping->nrpages == 0)
		return 0;
	unmap_mapping_range(mapping, 0, 0, 0);
740
	ret = filemap_write_and_wait(mapping);
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	if (ret != 0)
		goto out;
	ret = nfs_wb_all(mapping->host);
out:
	return ret;
}

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/*
 * Invalidate the local caches
 */
751
static void nfs_zap_caches_locked(struct inode *inode)
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{
	struct nfs_inode *nfsi = NFS_I(inode);
	int mode = inode->i_mode;

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	nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);

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	NFS_ATTRTIMEO(inode) = NFS_MINATTRTIMEO(inode);
	NFS_ATTRTIMEO_UPDATE(inode) = jiffies;

	memset(NFS_COOKIEVERF(inode), 0, sizeof(NFS_COOKIEVERF(inode)));
	if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode))
763
		nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE;
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	else
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		nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE;
766
}
767

768 769 770 771
void nfs_zap_caches(struct inode *inode)
{
	spin_lock(&inode->i_lock);
	nfs_zap_caches_locked(inode);
772
	spin_unlock(&inode->i_lock);
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}

static void nfs_zap_acl_cache(struct inode *inode)
{
	void (*clear_acl_cache)(struct inode *);

	clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
	if (clear_acl_cache != NULL)
		clear_acl_cache(inode);
782
	spin_lock(&inode->i_lock);
783
	NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
784
	spin_unlock(&inode->i_lock);
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}

/*
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 * Invalidate, but do not unhash, the inode.
 * NB: must be called with inode->i_lock held!
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 */
791
static void nfs_invalidate_inode(struct inode *inode)
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{
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	set_bit(NFS_INO_STALE, &NFS_FLAGS(inode));
	nfs_zap_caches_locked(inode);
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}

struct nfs_find_desc {
	struct nfs_fh		*fh;
	struct nfs_fattr	*fattr;
};

/*
 * In NFSv3 we can have 64bit inode numbers. In order to support
 * this, and re-exported directories (also seen in NFSv2)
 * we are forced to allow 2 different inodes to have the same
 * i_ino.
 */
static int
nfs_find_actor(struct inode *inode, void *opaque)
{
	struct nfs_find_desc	*desc = (struct nfs_find_desc *)opaque;
	struct nfs_fh		*fh = desc->fh;
	struct nfs_fattr	*fattr = desc->fattr;

	if (NFS_FILEID(inode) != fattr->fileid)
		return 0;
	if (nfs_compare_fh(NFS_FH(inode), fh))
		return 0;
	if (is_bad_inode(inode) || NFS_STALE(inode))
		return 0;
	return 1;
}

static int
nfs_init_locked(struct inode *inode, void *opaque)
{
	struct nfs_find_desc	*desc = (struct nfs_find_desc *)opaque;
	struct nfs_fattr	*fattr = desc->fattr;

	NFS_FILEID(inode) = fattr->fileid;
	nfs_copy_fh(NFS_FH(inode), desc->fh);
	return 0;
}

/* Don't use READDIRPLUS on directories that we believe are too large */
#define NFS_LIMIT_READDIRPLUS (8*PAGE_SIZE)

/*
 * This is our front-end to iget that looks up inodes by file handle
 * instead of inode number.
 */
struct inode *
nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr)
{
	struct nfs_find_desc desc = {
		.fh	= fh,
		.fattr	= fattr
	};
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	struct inode *inode = ERR_PTR(-ENOENT);
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	unsigned long hash;

	if ((fattr->valid & NFS_ATTR_FATTR) == 0)
		goto out_no_inode;

	if (!fattr->nlink) {
		printk("NFS: Buggy server - nlink == 0!\n");
		goto out_no_inode;
	}

	hash = nfs_fattr_to_ino_t(fattr);

862 863 864
	inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc);
	if (inode == NULL) {
		inode = ERR_PTR(-ENOMEM);
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		goto out_no_inode;
866
	}
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	if (inode->i_state & I_NEW) {
		struct nfs_inode *nfsi = NFS_I(inode);

		/* We set i_ino for the few things that still rely on it,
		 * such as stat(2) */
		inode->i_ino = hash;

		/* We can't support update_atime(), since the server will reset it */
		inode->i_flags |= S_NOATIME|S_NOCMTIME;
		inode->i_mode = fattr->mode;
		/* Why so? Because we want revalidate for devices/FIFOs, and
		 * that's precisely what we have in nfs_file_inode_operations.
		 */
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		inode->i_op = NFS_SB(sb)->rpc_ops->file_inode_ops;
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		if (S_ISREG(inode->i_mode)) {
			inode->i_fop = &nfs_file_operations;
			inode->i_data.a_ops = &nfs_file_aops;
			inode->i_data.backing_dev_info = &NFS_SB(sb)->backing_dev_info;
		} else if (S_ISDIR(inode->i_mode)) {
			inode->i_op = NFS_SB(sb)->rpc_ops->dir_inode_ops;
			inode->i_fop = &nfs_dir_operations;
			if (nfs_server_capable(inode, NFS_CAP_READDIRPLUS)
			    && fattr->size <= NFS_LIMIT_READDIRPLUS)
891
				set_bit(NFS_INO_ADVISE_RDPLUS, &NFS_FLAGS(inode));
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		} else if (S_ISLNK(inode->i_mode))
			inode->i_op = &nfs_symlink_inode_operations;
		else
			init_special_inode(inode, inode->i_mode, fattr->rdev);

897 898
		nfsi->read_cache_jiffies = fattr->time_start;
		nfsi->last_updated = jiffies;
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		inode->i_atime = fattr->atime;
		inode->i_mtime = fattr->mtime;
		inode->i_ctime = fattr->ctime;
		if (fattr->valid & NFS_ATTR_FATTR_V4)
			nfsi->change_attr = fattr->change_attr;
		inode->i_size = nfs_size_to_loff_t(fattr->size);
		inode->i_nlink = fattr->nlink;
		inode->i_uid = fattr->uid;
		inode->i_gid = fattr->gid;
		if (fattr->valid & (NFS_ATTR_FATTR_V3 | NFS_ATTR_FATTR_V4)) {
			/*
			 * report the blocks in 512byte units
			 */
			inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
			inode->i_blksize = inode->i_sb->s_blocksize;
		} else {
			inode->i_blocks = fattr->du.nfs2.blocks;
			inode->i_blksize = fattr->du.nfs2.blocksize;
		}
		nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
		nfsi->attrtimeo_timestamp = jiffies;
		memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
		nfsi->cache_access.cred = NULL;

		unlock_new_inode(inode);
	} else
		nfs_refresh_inode(inode, fattr);
	dprintk("NFS: nfs_fhget(%s/%Ld ct=%d)\n",
		inode->i_sb->s_id,
		(long long)NFS_FILEID(inode),
		atomic_read(&inode->i_count));

out:
	return inode;

out_no_inode:
935
	dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
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	goto out;
}

#define NFS_VALID_ATTRS (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE|ATTR_ATIME|ATTR_ATIME_SET|ATTR_MTIME|ATTR_MTIME_SET)

int
nfs_setattr(struct dentry *dentry, struct iattr *attr)
{
	struct inode *inode = dentry->d_inode;
	struct nfs_fattr fattr;
	int error;

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	nfs_inc_stats(inode, NFSIOS_VFSSETATTR);

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	if (attr->ia_valid & ATTR_SIZE) {
		if (!S_ISREG(inode->i_mode) || attr->ia_size == i_size_read(inode))
			attr->ia_valid &= ~ATTR_SIZE;
	}

	/* Optimization: if the end result is no change, don't RPC */
	attr->ia_valid &= NFS_VALID_ATTRS;
	if (attr->ia_valid == 0)
		return 0;

	lock_kernel();
	nfs_begin_data_update(inode);
962 963 964
	/* Write all dirty data */
	filemap_write_and_wait(inode->i_mapping);
	nfs_wb_all(inode);
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	/*
	 * Return any delegations if we're going to change ACLs
	 */
	if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
		nfs_inode_return_delegation(inode);
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	error = NFS_PROTO(inode)->setattr(dentry, &fattr, attr);
971
	if (error == 0)
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		nfs_refresh_inode(inode, &fattr);
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	nfs_end_data_update(inode);
	unlock_kernel();
	return error;
}

/**
 * nfs_setattr_update_inode - Update inode metadata after a setattr call.
 * @inode: pointer to struct inode
 * @attr: pointer to struct iattr
 *
 * Note: we do this in the *proc.c in order to ensure that
 *       it works for things like exclusive creates too.
 */
void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr)
{
	if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
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		if ((attr->ia_valid & ATTR_MODE) != 0) {
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			int mode = attr->ia_mode & S_IALLUGO;
			mode |= inode->i_mode & ~S_IALLUGO;
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			inode->i_mode = mode;
		}
		if ((attr->ia_valid & ATTR_UID) != 0)
			inode->i_uid = attr->ia_uid;
		if ((attr->ia_valid & ATTR_GID) != 0)
			inode->i_gid = attr->ia_gid;
998
		spin_lock(&inode->i_lock);
999
		NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1000
		spin_unlock(&inode->i_lock);
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	}
	if ((attr->ia_valid & ATTR_SIZE) != 0) {
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		nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
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		inode->i_size = attr->ia_size;
		vmtruncate(inode, attr->ia_size);
	}
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}

1009 1010 1011 1012 1013 1014 1015 1016
static int nfs_wait_schedule(void *word)
{
	if (signal_pending(current))
		return -ERESTARTSYS;
	schedule();
	return 0;
}

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/*
 * Wait for the inode to get unlocked.
 */
1020
static int nfs_wait_on_inode(struct inode *inode)
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{
	struct rpc_clnt	*clnt = NFS_CLIENT(inode);
	struct nfs_inode *nfsi = NFS_I(inode);
1024
	sigset_t oldmask;
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	int error;
1026 1027 1028 1029 1030 1031

	rpc_clnt_sigmask(clnt, &oldmask);
	error = wait_on_bit_lock(&nfsi->flags, NFS_INO_REVALIDATING,
					nfs_wait_schedule, TASK_INTERRUPTIBLE);
	rpc_clnt_sigunmask(clnt, &oldmask);

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	return error;
}

1035 1036 1037 1038 1039 1040 1041 1042 1043
static void nfs_wake_up_inode(struct inode *inode)
{
	struct nfs_inode *nfsi = NFS_I(inode);

	clear_bit(NFS_INO_REVALIDATING, &nfsi->flags);
	smp_mb__after_clear_bit();
	wake_up_bit(&nfsi->flags, NFS_INO_REVALIDATING);
}

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int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
{
	struct inode *inode = dentry->d_inode;
1047
	int need_atime = NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATIME;
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	int err;

1050
	/* Flush out writes to the server in order to update c/mtime */
1051
	nfs_sync_inode_wait(inode, 0, 0, FLUSH_NOCOMMIT);
1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063

	/*
	 * We may force a getattr if the user cares about atime.
	 *
	 * Note that we only have to check the vfsmount flags here:
	 *  - NFS always sets S_NOATIME by so checking it would give a
	 *    bogus result
	 *  - NFS never sets MS_NOATIME or MS_NODIRATIME so there is
	 *    no point in checking those.
	 */
 	if ((mnt->mnt_flags & MNT_NOATIME) ||
 	    ((mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
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		need_atime = 0;
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	if (need_atime)
		err = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
	else
		err = nfs_revalidate_inode(NFS_SERVER(inode), inode);
	if (!err)
		generic_fillattr(inode, stat);
	return err;
}

1075
static struct nfs_open_context *alloc_nfs_open_context(struct vfsmount *mnt, struct dentry *dentry, struct rpc_cred *cred)
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{
	struct nfs_open_context *ctx;

	ctx = (struct nfs_open_context *)kmalloc(sizeof(*ctx), GFP_KERNEL);
	if (ctx != NULL) {
		atomic_set(&ctx->count, 1);
		ctx->dentry = dget(dentry);
1083
		ctx->vfsmnt = mntget(mnt);
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		ctx->cred = get_rpccred(cred);
		ctx->state = NULL;
		ctx->lockowner = current->files;
		ctx->error = 0;
1088
		ctx->dir_cookie = 0;
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	}
	return ctx;
}

struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
{
	if (ctx != NULL)
		atomic_inc(&ctx->count);
	return ctx;
}

void put_nfs_open_context(struct nfs_open_context *ctx)
{
	if (atomic_dec_and_test(&ctx->count)) {
		if (!list_empty(&ctx->list)) {
			struct inode *inode = ctx->dentry->d_inode;
			spin_lock(&inode->i_lock);
			list_del(&ctx->list);
			spin_unlock(&inode->i_lock);
		}
		if (ctx->state != NULL)
			nfs4_close_state(ctx->state, ctx->mode);
		if (ctx->cred != NULL)
			put_rpccred(ctx->cred);
		dput(ctx->dentry);
1114
		mntput(ctx->vfsmnt);
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		kfree(ctx);
	}
}

/*
 * Ensure that mmap has a recent RPC credential for use when writing out
 * shared pages
 */
1123
static void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
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{
	struct inode *inode = filp->f_dentry->d_inode;
	struct nfs_inode *nfsi = NFS_I(inode);

	filp->private_data = get_nfs_open_context(ctx);
	spin_lock(&inode->i_lock);
	list_add(&ctx->list, &nfsi->open_files);
	spin_unlock(&inode->i_lock);
}

1134 1135 1136 1137
/*
 * Given an inode, search for an open context with the desired characteristics
 */
struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, int mode)
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{
	struct nfs_inode *nfsi = NFS_I(inode);
	struct nfs_open_context *pos, *ctx = NULL;

	spin_lock(&inode->i_lock);
	list_for_each_entry(pos, &nfsi->open_files, list) {
1144 1145
		if (cred != NULL && pos->cred != cred)
			continue;
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		if ((pos->mode & mode) == mode) {
			ctx = get_nfs_open_context(pos);
			break;
		}
	}
	spin_unlock(&inode->i_lock);
	return ctx;
}

1155
static void nfs_file_clear_open_context(struct file *filp)
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{
	struct inode *inode = filp->f_dentry->d_inode;
	struct nfs_open_context *ctx = (struct nfs_open_context *)filp->private_data;

	if (ctx) {
		filp->private_data = NULL;
		spin_lock(&inode->i_lock);
		list_move_tail(&ctx->list, &NFS_I(inode)->open_files);
		spin_unlock(&inode->i_lock);
		put_nfs_open_context(ctx);
	}
}

/*
 * These allocate and release file read/write context information.
 */
int nfs_open(struct inode *inode, struct file *filp)
{
	struct nfs_open_context *ctx;
	struct rpc_cred *cred;

	cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0);
	if (IS_ERR(cred))
		return PTR_ERR(cred);
1180
	ctx = alloc_nfs_open_context(filp->f_vfsmnt, filp->f_dentry, cred);
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	put_rpccred(cred);
	if (ctx == NULL)
		return -ENOMEM;
	ctx->mode = filp->f_mode;
	nfs_file_set_open_context(filp, ctx);
	put_nfs_open_context(ctx);
	return 0;
}

int nfs_release(struct inode *inode, struct file *filp)
{
	nfs_file_clear_open_context(filp);
	return 0;
}

/*
 * This function is called whenever some part of NFS notices that
 * the cached attributes have to be refreshed.
 */
int
__nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
{
	int		 status = -ESTALE;
	struct nfs_fattr fattr;
	struct nfs_inode *nfsi = NFS_I(inode);

	dfprintk(PAGECACHE, "NFS: revalidating (%s/%Ld)\n",
		inode->i_sb->s_id, (long long)NFS_FILEID(inode));

1210
	nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
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	lock_kernel();
	if (!inode || is_bad_inode(inode))
 		goto out_nowait;
	if (NFS_STALE(inode))
 		goto out_nowait;

1217 1218 1219 1220 1221 1222 1223
	status = nfs_wait_on_inode(inode);
	if (status < 0)
		goto out;
	if (NFS_STALE(inode)) {
		status = -ESTALE;
		/* Do we trust the cached ESTALE? */
		if (NFS_ATTRTIMEO(inode) != 0) {
1224
			if (nfsi->cache_validity & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ATIME)) {
1225 1226 1227 1228
				/* no */
			} else
				goto out;
		}
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	}

	status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), &fattr);
	if (status != 0) {
		dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) getattr failed, error=%d\n",
			 inode->i_sb->s_id,
			 (long long)NFS_FILEID(inode), status);
		if (status == -ESTALE) {
			nfs_zap_caches(inode);
			if (!S_ISDIR(inode->i_mode))
1239
				set_bit(NFS_INO_STALE, &NFS_FLAGS(inode));
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		}
		goto out;
	}

1244
	spin_lock(&inode->i_lock);
1245
	status = nfs_update_inode(inode, &fattr);
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	if (status) {
1247
		spin_unlock(&inode->i_lock);
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		dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) refresh failed, error=%d\n",
			 inode->i_sb->s_id,
			 (long long)NFS_FILEID(inode), status);
		goto out;
	}
1253
	spin_unlock(&inode->i_lock);
1254

1255
	if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
1256
		nfs_zap_acl_cache(inode);
1257

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	dfprintk(PAGECACHE, "NFS: (%s/%Ld) revalidation complete\n",
		inode->i_sb->s_id,
		(long long)NFS_FILEID(inode));

1262 1263 1264
 out:
	nfs_wake_up_inode(inode);

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 out_nowait:
	unlock_kernel();
	return status;
}

int nfs_attribute_timeout(struct inode *inode)
{
	struct nfs_inode *nfsi = NFS_I(inode);

	if (nfs_have_delegation(inode, FMODE_READ))
		return 0;
	return time_after(jiffies, nfsi->read_cache_jiffies+nfsi->attrtimeo);
}

/**
 * nfs_revalidate_inode - Revalidate the inode attributes
 * @server - pointer to nfs_server struct
 * @inode - pointer to inode struct
 *
 * Updates inode attribute information by retrieving the data from the server.
 */
int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
{
1288
	if (!(NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATTR)
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			&& !nfs_attribute_timeout(inode))
		return NFS_STALE(inode) ? -ESTALE : 0;
	return __nfs_revalidate_inode(server, inode);
}

1294 1295 1296 1297 1298
/**
 * nfs_revalidate_mapping - Revalidate the pagecache
 * @inode - pointer to host inode
 * @mapping - pointer to mapping
 */
1299
int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping)
1300 1301
{
	struct nfs_inode *nfsi = NFS_I(inode);
1302 1303 1304 1305 1306 1307 1308
	int ret = 0;

	if (NFS_STALE(inode))
		ret = -ESTALE;
	if ((nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE)
			|| nfs_attribute_timeout(inode))
		ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
1309

1310
	if (nfsi->cache_validity & NFS_INO_INVALID_DATA) {
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		nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
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		if (S_ISREG(inode->i_mode))
			nfs_sync_mapping(mapping);
1314
		invalidate_inode_pages2(mapping);
1315 1316

		spin_lock(&inode->i_lock);
1317
		nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
1318 1319 1320
		if (S_ISDIR(inode->i_mode)) {
			memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
			/* This ensures we revalidate child dentries */
1321
			nfsi->cache_change_attribute = jiffies;
1322
		}
1323 1324
		spin_unlock(&inode->i_lock);

1325 1326 1327 1328
		dfprintk(PAGECACHE, "NFS: (%s/%Ld) data cache invalidated\n",
				inode->i_sb->s_id,
				(long long)NFS_FILEID(inode));
	}
1329
	return ret;
1330 1331
}

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/**
 * nfs_begin_data_update
 * @inode - pointer to inode
 * Declare that a set of operations will update file data on the server
 */
void nfs_begin_data_update(struct inode *inode)
{
	atomic_inc(&NFS_I(inode)->data_updates);
}

/**
 * nfs_end_data_update
 * @inode - pointer to inode
 * Declare end of the operations that will update file data
 * This will mark the inode as immediately needing revalidation
 * of its attribute cache.
 */
void nfs_end_data_update(struct inode *inode)
{
	struct nfs_inode *nfsi = NFS_I(inode);

	if (!nfs_have_delegation(inode, FMODE_READ)) {
1354 1355 1356
		/* Directories and symlinks: invalidate page cache */
		if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) {
			spin_lock(&inode->i_lock);
1357
			nfsi->cache_validity |= NFS_INO_INVALID_DATA;
1358 1359
			spin_unlock(&inode->i_lock);
		}
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	}
1361
	nfsi->cache_change_attribute = jiffies;
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	atomic_dec(&nfsi->data_updates);
}

1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385
static void nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
{
	struct nfs_inode *nfsi = NFS_I(inode);

	/* If we have atomic WCC data, we may update some attributes */
	if ((fattr->valid & NFS_ATTR_WCC) != 0) {
		if (timespec_equal(&inode->i_ctime, &fattr->pre_ctime)) {
			memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
			nfsi->cache_change_attribute = jiffies;
		}
		if (timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) {
			memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
			nfsi->cache_change_attribute = jiffies;
		}
		if (inode->i_size == fattr->pre_size && nfsi->npages == 0) {
			inode->i_size = fattr->size;
			nfsi->cache_change_attribute = jiffies;
		}
	}
}

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/**
1387
 * nfs_check_inode_attributes - verify consistency of the inode attribute cache
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 * @inode - pointer to inode
 * @fattr - updated attributes
 *
 * Verifies the attribute cache. If we have just changed the attributes,
 * so that fattr carries weak cache consistency data, then it may
 * also update the ctime/mtime/change_attribute.
 */
1395
static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
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{
	struct nfs_inode *nfsi = NFS_I(inode);
	loff_t cur_size, new_isize;
	int data_unstable;

1401

1402 1403 1404 1405 1406 1407
	/* Has the inode gone and changed behind our back? */
	if (nfsi->fileid != fattr->fileid
			|| (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) {
		return -EIO;
	}

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	/* Are we in the process of updating data on the server? */
	data_unstable = nfs_caches_unstable(inode);

1411 1412
	/* Do atomic weak cache consistency updates */
	nfs_wcc_update_inode(inode, fattr);
L
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1413

1414
	if ((fattr->valid & NFS_ATTR_FATTR_V4) != 0 &&
1415 1416
			nfsi->change_attr != fattr->change_attr)
		nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
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1417 1418

	/* Verify a few of the more important attributes */
1419 1420
	if (!timespec_equal(&inode->i_mtime, &fattr->mtime))
		nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
1421 1422 1423

	cur_size = i_size_read(inode);
 	new_isize = nfs_size_to_loff_t(fattr->size);
1424 1425
	if (cur_size != new_isize && nfsi->npages == 0)
		nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
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1426 1427 1428 1429 1430

	/* Have any file permissions changed? */
	if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)
			|| inode->i_uid != fattr->uid
			|| inode->i_gid != fattr->gid)
1431
		nfsi->cache_validity |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
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1432 1433 1434

	/* Has the link count changed? */
	if (inode->i_nlink != fattr->nlink)
1435
		nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
L
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1436 1437

	if (!timespec_equal(&inode->i_atime, &fattr->atime))
1438
		nfsi->cache_validity |= NFS_INO_INVALID_ATIME;
L
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1439

1440
	nfsi->read_cache_jiffies = fattr->time_start;
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1441 1442 1443
	return 0;
}

1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462
/**
 * nfs_refresh_inode - try to update the inode attribute cache
 * @inode - pointer to inode
 * @fattr - updated attributes
 *
 * Check that an RPC call that returned attributes has not overlapped with
 * other recent updates of the inode metadata, then decide whether it is
 * safe to do a full update of the inode attributes, or whether just to
 * call nfs_check_inode_attributes.
 */
int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
{
	struct nfs_inode *nfsi = NFS_I(inode);
	int status;

	if ((fattr->valid & NFS_ATTR_FATTR) == 0)
		return 0;
	spin_lock(&inode->i_lock);
	if (time_after(fattr->time_start, nfsi->last_updated))
1463
		status = nfs_update_inode(inode, fattr);
1464 1465 1466 1467 1468 1469 1470
	else
		status = nfs_check_inode_attributes(inode, fattr);

	spin_unlock(&inode->i_lock);
	return status;
}

1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485
/**
 * nfs_post_op_update_inode - try to update the inode attribute cache
 * @inode - pointer to inode
 * @fattr - updated attributes
 *
 * After an operation that has changed the inode metadata, mark the
 * attribute cache as being invalid, then try to update it.
 */
int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
{
	struct nfs_inode *nfsi = NFS_I(inode);
	int status = 0;

	spin_lock(&inode->i_lock);
	if (unlikely((fattr->valid & NFS_ATTR_FATTR) == 0)) {
1486
		nfsi->cache_validity |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
1487 1488
		goto out;
	}
1489
	status = nfs_update_inode(inode, fattr);
1490 1491 1492 1493 1494
out:
	spin_unlock(&inode->i_lock);
	return status;
}

L
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1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506
/*
 * Many nfs protocol calls return the new file attributes after
 * an operation.  Here we update the inode to reflect the state
 * of the server's inode.
 *
 * This is a bit tricky because we have to make sure all dirty pages
 * have been sent off to the server before calling invalidate_inode_pages.
 * To make sure no other process adds more write requests while we try
 * our best to flush them, we make them sleep during the attribute refresh.
 *
 * A very similar scenario holds for the dir cache.
 */
1507
static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
L
Linus Torvalds 已提交
1508 1509
{
	struct nfs_inode *nfsi = NFS_I(inode);
1510
	loff_t cur_isize, new_isize;
L
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1511
	unsigned int	invalid = 0;
1512
	int data_stable;
L
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1513 1514 1515 1516 1517

	dfprintk(VFS, "NFS: %s(%s/%ld ct=%d info=0x%x)\n",
			__FUNCTION__, inode->i_sb->s_id, inode->i_ino,
			atomic_read(&inode->i_count), fattr->valid);

1518 1519
	if (nfsi->fileid != fattr->fileid)
		goto out_fileid;
L
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1520 1521 1522 1523

	/*
	 * Make sure the inode's type hasn't changed.
	 */
1524
	if ((inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
L
Linus Torvalds 已提交
1525 1526 1527 1528 1529
		goto out_changed;

	/*
	 * Update the read time so we don't revalidate too often.
	 */
1530 1531
	nfsi->read_cache_jiffies = fattr->time_start;
	nfsi->last_updated = jiffies;
L
Linus Torvalds 已提交
1532 1533

	/* Are we racing with known updates of the metadata on the server? */
1534 1535
	data_stable = nfs_verify_change_attribute(inode, fattr->time_start);
	if (data_stable)
1536
		nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_ATIME);
L
Linus Torvalds 已提交
1537

1538 1539 1540
	/* Do atomic weak cache consistency updates */
	nfs_wcc_update_inode(inode, fattr);

1541
	/* Check if our cached file size is stale */
L
Linus Torvalds 已提交
1542 1543
 	new_isize = nfs_size_to_loff_t(fattr->size);
	cur_isize = i_size_read(inode);
1544 1545 1546 1547
	if (new_isize != cur_isize) {
		/* Do we perhaps have any outstanding writes? */
		if (nfsi->npages == 0) {
			/* No, but did we race with nfs_end_data_update()? */
1548
			if (data_stable) {
L
Linus Torvalds 已提交
1549
				inode->i_size = new_isize;
1550
				invalid |= NFS_INO_INVALID_DATA;
L
Linus Torvalds 已提交
1551
			}
1552 1553
			invalid |= NFS_INO_INVALID_ATTR;
		} else if (new_isize > cur_isize) {
L
Linus Torvalds 已提交
1554 1555 1556
			inode->i_size = new_isize;
			invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
		}
1557
		nfsi->cache_change_attribute = jiffies;
1558 1559
		dprintk("NFS: isize change on server for file %s/%ld\n",
				inode->i_sb->s_id, inode->i_ino);
L
Linus Torvalds 已提交
1560 1561
	}

1562
	/* Check if the mtime agrees */
L
Linus Torvalds 已提交
1563 1564
	if (!timespec_equal(&inode->i_mtime, &fattr->mtime)) {
		memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1565 1566
		dprintk("NFS: mtime change on server for file %s/%ld\n",
				inode->i_sb->s_id, inode->i_ino);
1567 1568
		invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
		nfsi->cache_change_attribute = jiffies;
L
Linus Torvalds 已提交
1569 1570
	}

1571 1572
	/* If ctime has changed we should definitely clear access+acl caches */
	if (!timespec_equal(&inode->i_ctime, &fattr->ctime)) {
1573
		invalid |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1574
		memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1575
		nfsi->cache_change_attribute = jiffies;
1576
	}
L
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1577 1578 1579 1580 1581
	memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime));

	if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO) ||
	    inode->i_uid != fattr->uid ||
	    inode->i_gid != fattr->gid)
1582
		invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
L
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1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599

	inode->i_mode = fattr->mode;
	inode->i_nlink = fattr->nlink;
	inode->i_uid = fattr->uid;
	inode->i_gid = fattr->gid;

	if (fattr->valid & (NFS_ATTR_FATTR_V3 | NFS_ATTR_FATTR_V4)) {
		/*
		 * report the blocks in 512byte units
		 */
		inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
		inode->i_blksize = inode->i_sb->s_blocksize;
 	} else {
 		inode->i_blocks = fattr->du.nfs2.blocks;
 		inode->i_blksize = fattr->du.nfs2.blocksize;
 	}

1600 1601 1602 1603 1604 1605 1606
	if ((fattr->valid & NFS_ATTR_FATTR_V4) != 0 &&
			nfsi->change_attr != fattr->change_attr) {
		dprintk("NFS: change_attr change on server for file %s/%ld\n",
				inode->i_sb->s_id, inode->i_ino);
		nfsi->change_attr = fattr->change_attr;
		invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
		nfsi->cache_change_attribute = jiffies;
1607 1608
	}

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	/* Update attrtimeo value if we're out of the unstable period */
	if (invalid & NFS_INO_INVALID_ATTR) {
C
Chuck Lever 已提交
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		nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
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		nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
		nfsi->attrtimeo_timestamp = jiffies;
	} else if (time_after(jiffies, nfsi->attrtimeo_timestamp+nfsi->attrtimeo)) {
		if ((nfsi->attrtimeo <<= 1) > NFS_MAXATTRTIMEO(inode))
			nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
		nfsi->attrtimeo_timestamp = jiffies;
	}
	/* Don't invalidate the data if we were to blame */
	if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
				|| S_ISLNK(inode->i_mode)))
		invalid &= ~NFS_INO_INVALID_DATA;
1623 1624
	if (data_stable)
		invalid &= ~(NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ATIME|NFS_INO_REVAL_PAGECACHE);
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1625
	if (!nfs_have_delegation(inode, FMODE_READ))
1626
		nfsi->cache_validity |= invalid;
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1627 1628 1629 1630 1631 1632 1633 1634 1635 1636

	return 0;
 out_changed:
	/*
	 * Big trouble! The inode has become a different object.
	 */
#ifdef NFS_PARANOIA
	printk(KERN_DEBUG "%s: inode %ld mode changed, %07o to %07o\n",
			__FUNCTION__, inode->i_ino, inode->i_mode, fattr->mode);
#endif
1637
 out_err:
L
Linus Torvalds 已提交
1638 1639 1640 1641 1642 1643 1644
	/*
	 * No need to worry about unhashing the dentry, as the
	 * lookup validation will know that the inode is bad.
	 * (But we fall through to invalidate the caches.)
	 */
	nfs_invalidate_inode(inode);
	return -ESTALE;
1645 1646 1647 1648 1649 1650 1651

 out_fileid:
	printk(KERN_ERR "NFS: server %s error: fileid changed\n"
		"fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
		NFS_SERVER(inode)->hostname, inode->i_sb->s_id,
		(long long)nfsi->fileid, (long long)fattr->fileid);
	goto out_err;
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1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679
}

/*
 * File system information
 */

static int nfs_set_super(struct super_block *s, void *data)
{
	s->s_fs_info = data;
	return set_anon_super(s, data);
}
 
static int nfs_compare_super(struct super_block *sb, void *data)
{
	struct nfs_server *server = data;
	struct nfs_server *old = NFS_SB(sb);

	if (old->addr.sin_addr.s_addr != server->addr.sin_addr.s_addr)
		return 0;
	if (old->addr.sin_port != server->addr.sin_port)
		return 0;
	return !nfs_compare_fh(&old->fh, &server->fh);
}

static struct super_block *nfs_get_sb(struct file_system_type *fs_type,
	int flags, const char *dev_name, void *raw_data)
{
	int error;
1680
	struct nfs_server *server = NULL;
L
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	struct super_block *s;
	struct nfs_fh *root;
	struct nfs_mount_data *data = raw_data;

1685 1686 1687 1688 1689 1690 1691 1692
	s = ERR_PTR(-EINVAL);
	if (data == NULL) {
		dprintk("%s: missing data argument\n", __FUNCTION__);
		goto out_err;
	}
	if (data->version <= 0 || data->version > NFS_MOUNT_VERSION) {
		dprintk("%s: bad mount version\n", __FUNCTION__);
		goto out_err;
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Linus Torvalds 已提交
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	}
1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725
	switch (data->version) {
		case 1:
			data->namlen = 0;
		case 2:
			data->bsize  = 0;
		case 3:
			if (data->flags & NFS_MOUNT_VER3) {
				dprintk("%s: mount structure version %d does not support NFSv3\n",
						__FUNCTION__,
						data->version);
				goto out_err;
			}
			data->root.size = NFS2_FHSIZE;
			memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
		case 4:
			if (data->flags & NFS_MOUNT_SECFLAVOUR) {
				dprintk("%s: mount structure version %d does not support strong security\n",
						__FUNCTION__,
						data->version);
				goto out_err;
			}
		case 5:
			memset(data->context, 0, sizeof(data->context));
	}
#ifndef CONFIG_NFS_V3
	/* If NFSv3 is not compiled in, return -EPROTONOSUPPORT */
	s = ERR_PTR(-EPROTONOSUPPORT);
	if (data->flags & NFS_MOUNT_VER3) {
		dprintk("%s: NFSv3 not compiled into kernel\n", __FUNCTION__);
		goto out_err;
	}
#endif /* CONFIG_NFS_V3 */
L
Linus Torvalds 已提交
1726

1727
	s = ERR_PTR(-ENOMEM);
1728
	server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
L
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1729
	if (!server)
1730
		goto out_err;
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1731 1732
	/* Zero out the NFS state stuff */
	init_nfsv4_state(server);
1733
	server->client = server->client_sys = server->client_acl = ERR_PTR(-EINVAL);
L
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1734 1735 1736 1737 1738 1739

	root = &server->fh;
	if (data->flags & NFS_MOUNT_VER3)
		root->size = data->root.size;
	else
		root->size = NFS2_FHSIZE;
1740
	s = ERR_PTR(-EINVAL);
L
Linus Torvalds 已提交
1741
	if (root->size > sizeof(root->data)) {
1742 1743
		dprintk("%s: invalid root filehandle\n", __FUNCTION__);
		goto out_err;
L
Linus Torvalds 已提交
1744 1745 1746 1747 1748 1749
	}
	memcpy(root->data, data->root.data, root->size);

	/* We now require that the mount process passes the remote address */
	memcpy(&server->addr, &data->addr, sizeof(server->addr));
	if (server->addr.sin_addr.s_addr == INADDR_ANY) {
1750 1751 1752
		dprintk("%s: mount program didn't pass remote address!\n",
				__FUNCTION__);
		goto out_err;
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Linus Torvalds 已提交
1753 1754
	}

1755 1756 1757 1758 1759 1760
	/* Fire up rpciod if not yet running */
	s = ERR_PTR(rpciod_up());
	if (IS_ERR(s)) {
		dprintk("%s: couldn't start rpciod! Error = %ld\n",
				__FUNCTION__, PTR_ERR(s));
		goto out_err;
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1761 1762
	}

1763 1764 1765
	s = sget(fs_type, nfs_compare_super, nfs_set_super, server);
	if (IS_ERR(s) || s->s_root)
		goto out_rpciod_down;
L
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1767
	s->s_flags = flags;
L
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1768

1769
	error = nfs_fill_super(s, data, flags & MS_SILENT ? 1 : 0);
L
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1770 1771 1772 1773 1774 1775 1776
	if (error) {
		up_write(&s->s_umount);
		deactivate_super(s);
		return ERR_PTR(error);
	}
	s->s_flags |= MS_ACTIVE;
	return s;
1777 1778 1779 1780 1781
out_rpciod_down:
	rpciod_down();
out_err:
	kfree(server);
	return s;
L
Linus Torvalds 已提交
1782 1783 1784 1785 1786 1787 1788 1789
}

static void nfs_kill_super(struct super_block *s)
{
	struct nfs_server *server = NFS_SB(s);

	kill_anon_super(s);

1790
	if (!IS_ERR(server->client))
L
Linus Torvalds 已提交
1791
		rpc_shutdown_client(server->client);
1792
	if (!IS_ERR(server->client_sys))
L
Linus Torvalds 已提交
1793
		rpc_shutdown_client(server->client_sys);
1794 1795
	if (!IS_ERR(server->client_acl))
		rpc_shutdown_client(server->client_acl);
L
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1796 1797 1798 1799 1800 1801

	if (!(server->flags & NFS_MOUNT_NONLM))
		lockd_down();	/* release rpc.lockd */

	rpciod_down();		/* release rpciod */

1802
	nfs_free_iostats(server->io_stats);
J
Jesper Juhl 已提交
1803
	kfree(server->hostname);
L
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1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828
	kfree(server);
}

static struct file_system_type nfs_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "nfs",
	.get_sb		= nfs_get_sb,
	.kill_sb	= nfs_kill_super,
	.fs_flags	= FS_ODD_RENAME|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
};

#ifdef CONFIG_NFS_V4

static void nfs4_clear_inode(struct inode *);


static struct super_operations nfs4_sops = { 
	.alloc_inode	= nfs_alloc_inode,
	.destroy_inode	= nfs_destroy_inode,
	.write_inode	= nfs_write_inode,
	.delete_inode	= nfs_delete_inode,
	.statfs		= nfs_statfs,
	.clear_inode	= nfs4_clear_inode,
	.umount_begin	= nfs_umount_begin,
	.show_options	= nfs_show_options,
1829
	.show_stats	= nfs_show_stats,
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Linus Torvalds 已提交
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};

/*
 * Clean out any remaining NFSv4 state that might be left over due
 * to open() calls that passed nfs_atomic_lookup, but failed to call
 * nfs_open().
 */
static void nfs4_clear_inode(struct inode *inode)
{
	struct nfs_inode *nfsi = NFS_I(inode);

	/* If we are holding a delegation, return it! */
1842
	nfs_inode_return_delegation(inode);
L
Linus Torvalds 已提交
1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870
	/* First call standard NFS clear_inode() code */
	nfs_clear_inode(inode);
	/* Now clear out any remaining state */
	while (!list_empty(&nfsi->open_states)) {
		struct nfs4_state *state;
		
		state = list_entry(nfsi->open_states.next,
				struct nfs4_state,
				inode_states);
		dprintk("%s(%s/%Ld): found unclaimed NFSv4 state %p\n",
				__FUNCTION__,
				inode->i_sb->s_id,
				(long long)NFS_FILEID(inode),
				state);
		BUG_ON(atomic_read(&state->count) != 1);
		nfs4_close_state(state, state->state);
	}
}


static int nfs4_fill_super(struct super_block *sb, struct nfs4_mount_data *data, int silent)
{
	struct nfs_server *server;
	struct nfs4_client *clp = NULL;
	struct rpc_xprt *xprt = NULL;
	struct rpc_clnt *clnt = NULL;
	struct rpc_timeout timeparms;
	rpc_authflavor_t authflavour;
1871
	int err = -EIO;
L
Linus Torvalds 已提交
1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889

	sb->s_blocksize_bits = 0;
	sb->s_blocksize = 0;
	server = NFS_SB(sb);
	if (data->rsize != 0)
		server->rsize = nfs_block_size(data->rsize, NULL);
	if (data->wsize != 0)
		server->wsize = nfs_block_size(data->wsize, NULL);
	server->flags = data->flags & NFS_MOUNT_FLAGMASK;
	server->caps = NFS_CAP_ATOMIC_OPEN;

	server->acregmin = data->acregmin*HZ;
	server->acregmax = data->acregmax*HZ;
	server->acdirmin = data->acdirmin*HZ;
	server->acdirmax = data->acdirmax*HZ;

	server->rpc_ops = &nfs_v4_clientops;

1890
	nfs_init_timeout_values(&timeparms, data->proto, data->timeo, data->retrans);
L
Linus Torvalds 已提交
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1892 1893 1894
	server->retrans_timeo = timeparms.to_initval;
	server->retrans_count = timeparms.to_retries;

L
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1895 1896
	clp = nfs4_get_client(&server->addr.sin_addr);
	if (!clp) {
1897
		dprintk("%s: failed to create NFS4 client.\n", __FUNCTION__);
L
Linus Torvalds 已提交
1898 1899 1900 1901 1902 1903
		return -EIO;
	}

	/* Now create transport and client */
	authflavour = RPC_AUTH_UNIX;
	if (data->auth_flavourlen != 0) {
1904 1905 1906 1907 1908 1909
		if (data->auth_flavourlen != 1) {
			dprintk("%s: Invalid number of RPC auth flavours %d.\n",
					__FUNCTION__, data->auth_flavourlen);
			err = -EINVAL;
			goto out_fail;
		}
L
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1910 1911 1912 1913 1914 1915 1916
		if (copy_from_user(&authflavour, data->auth_flavours, sizeof(authflavour))) {
			err = -EFAULT;
			goto out_fail;
		}
	}

	down_write(&clp->cl_sem);
1917
	if (IS_ERR(clp->cl_rpcclient)) {
1918
		xprt = xprt_create_proto(data->proto, &server->addr, &timeparms);
L
Linus Torvalds 已提交
1919 1920 1921
		if (IS_ERR(xprt)) {
			up_write(&clp->cl_sem);
			err = PTR_ERR(xprt);
1922 1923
			dprintk("%s: cannot create RPC transport. Error = %d\n",
					__FUNCTION__, err);
L
Linus Torvalds 已提交
1924 1925 1926 1927 1928 1929 1930
			goto out_fail;
		}
		clnt = rpc_create_client(xprt, server->hostname, &nfs_program,
				server->rpc_ops->version, authflavour);
		if (IS_ERR(clnt)) {
			up_write(&clp->cl_sem);
			err = PTR_ERR(clnt);
1931 1932
			dprintk("%s: cannot create RPC client. Error = %d\n",
					__FUNCTION__, err);
L
Linus Torvalds 已提交
1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948
			goto out_fail;
		}
		clnt->cl_intr     = 1;
		clnt->cl_softrtry = 1;
		clp->cl_rpcclient = clnt;
		memcpy(clp->cl_ipaddr, server->ip_addr, sizeof(clp->cl_ipaddr));
		nfs_idmap_new(clp);
	}
	list_add_tail(&server->nfs4_siblings, &clp->cl_superblocks);
	clnt = rpc_clone_client(clp->cl_rpcclient);
	if (!IS_ERR(clnt))
			server->nfs4_state = clp;
	up_write(&clp->cl_sem);
	clp = NULL;

	if (IS_ERR(clnt)) {
1949 1950 1951 1952
		err = PTR_ERR(clnt);
		dprintk("%s: cannot create RPC client. Error = %d\n",
				__FUNCTION__, err);
		return err;
L
Linus Torvalds 已提交
1953 1954 1955 1956 1957
	}

	server->client    = clnt;

	if (server->nfs4_state->cl_idmap == NULL) {
1958
		dprintk("%s: failed to create idmapper.\n", __FUNCTION__);
L
Linus Torvalds 已提交
1959 1960 1961 1962
		return -ENOMEM;
	}

	if (clnt->cl_auth->au_flavor != authflavour) {
1963 1964 1965 1966
		struct rpc_auth *auth;

		auth = rpcauth_create(authflavour, clnt);
		if (IS_ERR(auth)) {
1967
			dprintk("%s: couldn't create credcache!\n", __FUNCTION__);
1968
			return PTR_ERR(auth);
L
Linus Torvalds 已提交
1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010
		}
	}

	sb->s_time_gran = 1;

	sb->s_op = &nfs4_sops;
	err = nfs_sb_init(sb, authflavour);
	if (err == 0)
		return 0;
out_fail:
	if (clp)
		nfs4_put_client(clp);
	return err;
}

static int nfs4_compare_super(struct super_block *sb, void *data)
{
	struct nfs_server *server = data;
	struct nfs_server *old = NFS_SB(sb);

	if (strcmp(server->hostname, old->hostname) != 0)
		return 0;
	if (strcmp(server->mnt_path, old->mnt_path) != 0)
		return 0;
	return 1;
}

static void *
nfs_copy_user_string(char *dst, struct nfs_string *src, int maxlen)
{
	void *p = NULL;

	if (!src->len)
		return ERR_PTR(-EINVAL);
	if (src->len < maxlen)
		maxlen = src->len;
	if (dst == NULL) {
		p = dst = kmalloc(maxlen + 1, GFP_KERNEL);
		if (p == NULL)
			return ERR_PTR(-ENOMEM);
	}
	if (copy_from_user(dst, src->data, maxlen)) {
J
Jesper Juhl 已提交
2011
		kfree(p);
L
Linus Torvalds 已提交
2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026
		return ERR_PTR(-EFAULT);
	}
	dst[maxlen] = '\0';
	return dst;
}

static struct super_block *nfs4_get_sb(struct file_system_type *fs_type,
	int flags, const char *dev_name, void *raw_data)
{
	int error;
	struct nfs_server *server;
	struct super_block *s;
	struct nfs4_mount_data *data = raw_data;
	void *p;

2027 2028 2029 2030 2031 2032
	if (data == NULL) {
		dprintk("%s: missing data argument\n", __FUNCTION__);
		return ERR_PTR(-EINVAL);
	}
	if (data->version <= 0 || data->version > NFS4_MOUNT_VERSION) {
		dprintk("%s: bad mount version\n", __FUNCTION__);
L
Linus Torvalds 已提交
2033 2034 2035
		return ERR_PTR(-EINVAL);
	}

2036
	server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
L
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2037 2038 2039 2040
	if (!server)
		return ERR_PTR(-ENOMEM);
	/* Zero out the NFS state stuff */
	init_nfsv4_state(server);
2041
	server->client = server->client_sys = server->client_acl = ERR_PTR(-EINVAL);
L
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2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068

	p = nfs_copy_user_string(NULL, &data->hostname, 256);
	if (IS_ERR(p))
		goto out_err;
	server->hostname = p;

	p = nfs_copy_user_string(NULL, &data->mnt_path, 1024);
	if (IS_ERR(p))
		goto out_err;
	server->mnt_path = p;

	p = nfs_copy_user_string(server->ip_addr, &data->client_addr,
			sizeof(server->ip_addr) - 1);
	if (IS_ERR(p))
		goto out_err;

	/* We now require that the mount process passes the remote address */
	if (data->host_addrlen != sizeof(server->addr)) {
		s = ERR_PTR(-EINVAL);
		goto out_free;
	}
	if (copy_from_user(&server->addr, data->host_addr, sizeof(server->addr))) {
		s = ERR_PTR(-EFAULT);
		goto out_free;
	}
	if (server->addr.sin_family != AF_INET ||
	    server->addr.sin_addr.s_addr == INADDR_ANY) {
2069 2070
		dprintk("%s: mount program didn't pass remote IP address!\n",
				__FUNCTION__);
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2071 2072 2073 2074
		s = ERR_PTR(-EINVAL);
		goto out_free;
	}

2075 2076 2077 2078 2079 2080 2081 2082
	/* Fire up rpciod if not yet running */
	s = ERR_PTR(rpciod_up());
	if (IS_ERR(s)) {
		dprintk("%s: couldn't start rpciod! Error = %ld\n",
				__FUNCTION__, PTR_ERR(s));
		goto out_free;
	}

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2083 2084 2085 2086 2087 2088 2089
	s = sget(fs_type, nfs4_compare_super, nfs_set_super, server);

	if (IS_ERR(s) || s->s_root)
		goto out_free;

	s->s_flags = flags;

2090
	error = nfs4_fill_super(s, data, flags & MS_SILENT ? 1 : 0);
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2091 2092 2093 2094 2095 2096 2097 2098 2099 2100
	if (error) {
		up_write(&s->s_umount);
		deactivate_super(s);
		return ERR_PTR(error);
	}
	s->s_flags |= MS_ACTIVE;
	return s;
out_err:
	s = (struct super_block *)p;
out_free:
J
Jesper Juhl 已提交
2101 2102
	kfree(server->mnt_path);
	kfree(server->hostname);
L
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2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120
	kfree(server);
	return s;
}

static void nfs4_kill_super(struct super_block *sb)
{
	struct nfs_server *server = NFS_SB(sb);

	nfs_return_all_delegations(sb);
	kill_anon_super(sb);

	nfs4_renewd_prepare_shutdown(server);

	if (server->client != NULL && !IS_ERR(server->client))
		rpc_shutdown_client(server->client);

	destroy_nfsv4_state(server);

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	rpciod_down();

2123
	nfs_free_iostats(server->io_stats);
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	kfree(server->hostname);
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	kfree(server);
}

static struct file_system_type nfs4_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "nfs4",
	.get_sb		= nfs4_get_sb,
	.kill_sb	= nfs4_kill_super,
	.fs_flags	= FS_ODD_RENAME|FS_REVAL_DOT|FS_BINARY_MOUNTDATA,
};

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static const int nfs_set_port_min = 0;
static const int nfs_set_port_max = 65535;
static int param_set_port(const char *val, struct kernel_param *kp)
{
	char *endp;
	int num = simple_strtol(val, &endp, 0);
	if (endp == val || *endp || num < nfs_set_port_min || num > nfs_set_port_max)
		return -EINVAL;
	*((int *)kp->arg) = num;
	return 0;
}

module_param_call(callback_tcpport, param_set_port, param_get_int,
		 &nfs_callback_set_tcpport, 0644);

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static int param_set_idmap_timeout(const char *val, struct kernel_param *kp)
{
	char *endp;
	int num = simple_strtol(val, &endp, 0);
	int jif = num * HZ;
	if (endp == val || *endp || num < 0 || jif < num)
		return -EINVAL;
	*((int *)kp->arg) = jif;
	return 0;
}

module_param_call(idmap_cache_timeout, param_set_idmap_timeout, param_get_int,
		 &nfs_idmap_cache_timeout, 0644);

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#define nfs4_init_once(nfsi) \
	do { \
		INIT_LIST_HEAD(&(nfsi)->open_states); \
		nfsi->delegation = NULL; \
		nfsi->delegation_state = 0; \
		init_rwsem(&nfsi->rwsem); \
	} while(0)
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static inline int register_nfs4fs(void)
{
	int ret;

	ret = nfs_register_sysctl();
	if (ret != 0)
		return ret;
	ret = register_filesystem(&nfs4_fs_type);
	if (ret != 0)
		nfs_unregister_sysctl();
	return ret;
}

static inline void unregister_nfs4fs(void)
{
	unregister_filesystem(&nfs4_fs_type);
	nfs_unregister_sysctl();
}
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#else
#define nfs4_init_once(nfsi) \
	do { } while (0)
#define register_nfs4fs() (0)
#define unregister_nfs4fs()
#endif

extern int nfs_init_nfspagecache(void);
extern void nfs_destroy_nfspagecache(void);
extern int nfs_init_readpagecache(void);
extern void nfs_destroy_readpagecache(void);
extern int nfs_init_writepagecache(void);
extern void nfs_destroy_writepagecache(void);
#ifdef CONFIG_NFS_DIRECTIO
extern int nfs_init_directcache(void);
extern void nfs_destroy_directcache(void);
#endif

static kmem_cache_t * nfs_inode_cachep;

static struct inode *nfs_alloc_inode(struct super_block *sb)
{
	struct nfs_inode *nfsi;
	nfsi = (struct nfs_inode *)kmem_cache_alloc(nfs_inode_cachep, SLAB_KERNEL);
	if (!nfsi)
		return NULL;
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	nfsi->flags = 0UL;
	nfsi->cache_validity = 0UL;
2219
	nfsi->cache_change_attribute = jiffies;
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#ifdef CONFIG_NFS_V3_ACL
	nfsi->acl_access = ERR_PTR(-EAGAIN);
	nfsi->acl_default = ERR_PTR(-EAGAIN);
#endif
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#ifdef CONFIG_NFS_V4
	nfsi->nfs4_acl = NULL;
#endif /* CONFIG_NFS_V4 */
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	return &nfsi->vfs_inode;
}

static void nfs_destroy_inode(struct inode *inode)
{
	kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
}

static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
{
	struct nfs_inode *nfsi = (struct nfs_inode *) foo;

	if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
	    SLAB_CTOR_CONSTRUCTOR) {
		inode_init_once(&nfsi->vfs_inode);
		spin_lock_init(&nfsi->req_lock);
		INIT_LIST_HEAD(&nfsi->dirty);
		INIT_LIST_HEAD(&nfsi->commit);
		INIT_LIST_HEAD(&nfsi->open_files);
		INIT_RADIX_TREE(&nfsi->nfs_page_tree, GFP_ATOMIC);
		atomic_set(&nfsi->data_updates, 0);
		nfsi->ndirty = 0;
		nfsi->ncommit = 0;
		nfsi->npages = 0;
		nfs4_init_once(nfsi);
	}
}
 
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static int nfs_init_inodecache(void)
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{
	nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
					     sizeof(struct nfs_inode),
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					     0, (SLAB_RECLAIM_ACCOUNT|
						SLAB_MEM_SPREAD),
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					     init_once, NULL);
	if (nfs_inode_cachep == NULL)
		return -ENOMEM;

	return 0;
}

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static void nfs_destroy_inodecache(void)
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{
	if (kmem_cache_destroy(nfs_inode_cachep))
		printk(KERN_INFO "nfs_inode_cache: not all structures were freed\n");
}

/*
 * Initialize NFS
 */
static int __init init_nfs_fs(void)
{
	int err;

	err = nfs_init_nfspagecache();
	if (err)
		goto out4;

	err = nfs_init_inodecache();
	if (err)
		goto out3;

	err = nfs_init_readpagecache();
	if (err)
		goto out2;

	err = nfs_init_writepagecache();
	if (err)
		goto out1;

#ifdef CONFIG_NFS_DIRECTIO
	err = nfs_init_directcache();
	if (err)
		goto out0;
#endif

#ifdef CONFIG_PROC_FS
	rpc_proc_register(&nfs_rpcstat);
#endif
        err = register_filesystem(&nfs_fs_type);
	if (err)
		goto out;
	if ((err = register_nfs4fs()) != 0)
		goto out;
	return 0;
out:
#ifdef CONFIG_PROC_FS
	rpc_proc_unregister("nfs");
#endif
#ifdef CONFIG_NFS_DIRECTIO
	nfs_destroy_directcache();
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out0:
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#endif
2320
	nfs_destroy_writepagecache();
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out1:
	nfs_destroy_readpagecache();
out2:
	nfs_destroy_inodecache();
out3:
	nfs_destroy_nfspagecache();
out4:
	return err;
}

static void __exit exit_nfs_fs(void)
{
#ifdef CONFIG_NFS_DIRECTIO
	nfs_destroy_directcache();
#endif
	nfs_destroy_writepagecache();
	nfs_destroy_readpagecache();
	nfs_destroy_inodecache();
	nfs_destroy_nfspagecache();
#ifdef CONFIG_PROC_FS
	rpc_proc_unregister("nfs");
#endif
	unregister_filesystem(&nfs_fs_type);
	unregister_nfs4fs();
}

/* Not quite true; I just maintain it */
MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
MODULE_LICENSE("GPL");

module_init(init_nfs_fs)
module_exit(exit_nfs_fs)