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kernel-ark/fs/nfs/inode.c
J. Bruce Fields 92cfc62cb8 [PATCH] NFS: Allow NFS versions to support different sets of inode operations. 
ACL support will require supporting additional inode operations in v4
 (getxattr, setxattr, listxattr).  This patch allows different protocol versions
 to support different inode operations by adding a file_inode_ops to the
 nfs_rpc_ops (to match the existing dir_inode_ops).

 Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
 Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
2005-06-22 16:07:09 -04:00

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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>
#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>
#include "nfs4_fs.h"
#include "delegation.h"
#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 *);
static int nfs_update_inode(struct inode *, struct nfs_fattr *, unsigned long);
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 *);
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,
};
/*
* 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,
.nrvers = sizeof(nfs_version) / sizeof(nfs_version[0]),
.version = nfs_version,
.stats = &nfs_rpcstat,
.pipe_dir_name = "/nfs",
};
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)
{
int flags = sync ? FLUSH_WAIT : 0;
int ret;
ret = nfs_commit_inode(inode, 0, 0, flags);
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);
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);
}
/*
* For the moment, the only task for the NFS clear_inode method is to
* release the mmap credential
*/
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));
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)
{
struct nfs_server *server = NFS_SB(sb);
struct rpc_clnt *rpc;
/* -EIO all pending I/O */
if ((rpc = server->client) != NULL)
rpc_killall_tasks(rpc);
}
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)
{
if (bsize < 1024)
bsize = NFS_DEF_FILE_IO_BUFFER_SIZE;
else if (bsize >= NFS_MAX_FILE_IO_BUFFER_SIZE)
bsize = NFS_MAX_FILE_IO_BUFFER_SIZE;
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);
struct inode *rooti;
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);
}
rooti = nfs_fhget(sb, rootfh, fsinfo->fattr);
if (!rooti)
return ERR_PTR(-ENOMEM);
return rooti;
}
/*
* 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;
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;
/* 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;
if (server->wsize > max_rpc_payload)
server->wsize = max_rpc_payload;
server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
if (server->rpages > NFS_READ_MAXIOV) {
server->rpages = NFS_READ_MAXIOV;
server->rsize = server->rpages << PAGE_CACHE_SHIFT;
}
server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
if (server->wpages > NFS_WRITE_MAXIOV) {
server->wpages = NFS_WRITE_MAXIOV;
server->wsize = server->wpages << 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;
}
/*
* 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;
int tcp = (data->flags & NFS_MOUNT_TCP);
/* Initialize timeout values */
timeparms.to_initval = data->timeo * HZ / 10;
timeparms.to_retries = data->retrans;
timeparms.to_maxval = tcp ? RPC_MAX_TCP_TIMEOUT : RPC_MAX_UDP_TIMEOUT;
timeparms.to_exponential = 1;
if (!timeparms.to_initval)
timeparms.to_initval = (tcp ? 600 : 11) * HZ / 10;
if (!timeparms.to_retries)
timeparms.to_retries = 5;
/* create transport and client */
xprt = xprt_create_proto(tcp ? IPPROTO_TCP : IPPROTO_UDP,
&server->addr, &timeparms);
if (IS_ERR(xprt)) {
dprintk("%s: cannot create RPC transport. Error = %ld\n",
__FUNCTION__, PTR_ERR(xprt));
return (struct rpc_clnt *)xprt;
}
clnt = rpc_create_client(xprt, server->hostname, &nfs_program,
server->rpc_ops->version, data->pseudoflavor);
if (IS_ERR(clnt)) {
dprintk("%s: cannot create RPC client. Error = %ld\n",
__FUNCTION__, PTR_ERR(xprt));
goto out_fail;
}
clnt->cl_intr = 1;
clnt->cl_softrtry = 1;
clnt->cl_chatty = 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
if (server->flags & NFS_MOUNT_VER3) {
server->rpc_ops = &nfs_v3_clientops;
server->caps |= NFS_CAP_READDIRPLUS;
} else {
server->rpc_ops = &nfs_v2_clientops;
}
#else
server->rpc_ops = &nfs_v2_clientops;
#endif
/* 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) {
server->client_sys = rpc_clone_client(server->client);
if (IS_ERR(server->client_sys))
return PTR_ERR(server->client_sys);
if (!rpcauth_create(RPC_AUTH_UNIX, server->client_sys))
return -ENOMEM;
} else {
atomic_inc(&server->client->cl_count);
server->client_sys = server->client;
}
if (server->flags & NFS_MOUNT_VER3) {
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:
printk(KERN_WARNING "nfs_statfs: statfs error = %d\n", -error);
buf->f_bsize = buf->f_blocks = buf->f_bfree = buf->f_bavail = -1;
goto out;
}
static int nfs_show_options(struct seq_file *m, struct vfsmount *mnt)
{
static struct proc_nfs_info {
int flag;
char *str;
char *nostr;
} nfs_info[] = {
{ NFS_MOUNT_SOFT, ",soft", ",hard" },
{ NFS_MOUNT_INTR, ",intr", "" },
{ NFS_MOUNT_POSIX, ",posix", "" },
{ NFS_MOUNT_TCP, ",tcp", ",udp" },
{ NFS_MOUNT_NOCTO, ",nocto", "" },
{ NFS_MOUNT_NOAC, ",noac", "" },
{ NFS_MOUNT_NONLM, ",nolock", ",lock" },
{ 0, NULL, NULL }
};
struct proc_nfs_info *nfs_infop;
struct nfs_server *nfss = NFS_SB(mnt->mnt_sb);
seq_printf(m, ",v%d", nfss->rpc_ops->version);
seq_printf(m, ",rsize=%d", nfss->rsize);
seq_printf(m, ",wsize=%d", nfss->wsize);
if (nfss->acregmin != 3*HZ)
seq_printf(m, ",acregmin=%d", nfss->acregmin/HZ);
if (nfss->acregmax != 60*HZ)
seq_printf(m, ",acregmax=%d", nfss->acregmax/HZ);
if (nfss->acdirmin != 30*HZ)
seq_printf(m, ",acdirmin=%d", nfss->acdirmin/HZ);
if (nfss->acdirmax != 60*HZ)
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);
}
seq_puts(m, ",addr=");
seq_escape(m, nfss->hostname, " \t\n\\");
return 0;
}
/*
* Invalidate the local caches
*/
void
nfs_zap_caches(struct inode *inode)
{
struct nfs_inode *nfsi = NFS_I(inode);
int mode = inode->i_mode;
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))
nfsi->flags |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS;
else
nfsi->flags |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS;
}
/*
* Invalidate, but do not unhash, the inode
*/
static void
nfs_invalidate_inode(struct inode *inode)
{
umode_t save_mode = inode->i_mode;
make_bad_inode(inode);
inode->i_mode = save_mode;
nfs_zap_caches(inode);
}
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
};
struct inode *inode = NULL;
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);
if (!(inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc)))
goto out_no_inode;
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.
*/
inode->i_op = NFS_SB(sb)->rpc_ops->file_inode_ops;
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)
NFS_FLAGS(inode) |= NFS_INO_ADVISE_RDPLUS;
} else if (S_ISLNK(inode->i_mode))
inode->i_op = &nfs_symlink_inode_operations;
else
init_special_inode(inode, inode->i_mode, fattr->rdev);
nfsi->read_cache_jiffies = fattr->timestamp;
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:
printk("nfs_fhget: iget failed\n");
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;
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);
/* Write all dirty data if we're changing file permissions or size */
if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE)) != 0) {
if (filemap_fdatawrite(inode->i_mapping) == 0)
filemap_fdatawait(inode->i_mapping);
nfs_wb_all(inode);
}
error = NFS_PROTO(inode)->setattr(dentry, &fattr, attr);
if (error == 0) {
nfs_refresh_inode(inode, &fattr);
if ((attr->ia_valid & ATTR_MODE) != 0) {
int mode;
mode = inode->i_mode & ~S_IALLUGO;
mode |= attr->ia_mode & S_IALLUGO;
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;
if ((attr->ia_valid & ATTR_SIZE) != 0) {
inode->i_size = attr->ia_size;
vmtruncate(inode, attr->ia_size);
}
}
if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
NFS_FLAGS(inode) |= NFS_INO_INVALID_ACCESS;
nfs_end_data_update(inode);
unlock_kernel();
return error;
}
/*
* Wait for the inode to get unlocked.
* (Used for NFS_INO_LOCKED and NFS_INO_REVALIDATING).
*/
static int
nfs_wait_on_inode(struct inode *inode, int flag)
{
struct rpc_clnt *clnt = NFS_CLIENT(inode);
struct nfs_inode *nfsi = NFS_I(inode);
int error;
if (!(NFS_FLAGS(inode) & flag))
return 0;
atomic_inc(&inode->i_count);
error = nfs_wait_event(clnt, nfsi->nfs_i_wait,
!(NFS_FLAGS(inode) & flag));
iput(inode);
return error;
}
int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
{
struct inode *inode = dentry->d_inode;
struct nfs_inode *nfsi = NFS_I(inode);
int need_atime = nfsi->flags & NFS_INO_INVALID_ATIME;
int err;
if (__IS_FLG(inode, MS_NOATIME))
need_atime = 0;
else if (__IS_FLG(inode, MS_NODIRATIME) && S_ISDIR(inode->i_mode))
need_atime = 0;
/* We may force a getattr if the user cares about atime */
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;
}
struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, struct rpc_cred *cred)
{
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);
ctx->cred = get_rpccred(cred);
ctx->state = NULL;
ctx->lockowner = current->files;
ctx->error = 0;
}
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);
kfree(ctx);
}
}
/*
* Ensure that mmap has a recent RPC credential for use when writing out
* shared pages
*/
void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
{
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);
}
struct nfs_open_context *nfs_find_open_context(struct inode *inode, int mode)
{
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) {
if ((pos->mode & mode) == mode) {
ctx = get_nfs_open_context(pos);
break;
}
}
spin_unlock(&inode->i_lock);
return ctx;
}
void nfs_file_clear_open_context(struct file *filp)
{
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);
ctx = alloc_nfs_open_context(filp->f_dentry, cred);
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);
if ((filp->f_mode & FMODE_WRITE) != 0)
nfs_begin_data_update(inode);
return 0;
}
int nfs_release(struct inode *inode, struct file *filp)
{
if ((filp->f_mode & FMODE_WRITE) != 0)
nfs_end_data_update(inode);
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);
unsigned long verifier;
unsigned int flags;
dfprintk(PAGECACHE, "NFS: revalidating (%s/%Ld)\n",
inode->i_sb->s_id, (long long)NFS_FILEID(inode));
lock_kernel();
if (!inode || is_bad_inode(inode))
goto out_nowait;
if (NFS_STALE(inode))
goto out_nowait;
while (NFS_REVALIDATING(inode)) {
status = nfs_wait_on_inode(inode, NFS_INO_REVALIDATING);
if (status < 0)
goto out_nowait;
if (NFS_ATTRTIMEO(inode) == 0)
continue;
if (NFS_FLAGS(inode) & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ATIME))
continue;
status = NFS_STALE(inode) ? -ESTALE : 0;
goto out_nowait;
}
NFS_FLAGS(inode) |= NFS_INO_REVALIDATING;
/* Protect against RPC races by saving the change attribute */
verifier = nfs_save_change_attribute(inode);
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))
NFS_FLAGS(inode) |= NFS_INO_STALE;
}
goto out;
}
status = nfs_update_inode(inode, &fattr, verifier);
if (status) {
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;
}
flags = nfsi->flags;
/*
* We may need to keep the attributes marked as invalid if
* we raced with nfs_end_attr_update().
*/
if (verifier == nfsi->cache_change_attribute)
nfsi->flags &= ~(NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ATIME);
/* Do the page cache invalidation */
if (flags & NFS_INO_INVALID_DATA) {
if (S_ISREG(inode->i_mode)) {
if (filemap_fdatawrite(inode->i_mapping) == 0)
filemap_fdatawait(inode->i_mapping);
nfs_wb_all(inode);
}
nfsi->flags &= ~NFS_INO_INVALID_DATA;
invalidate_inode_pages2(inode->i_mapping);
memset(NFS_COOKIEVERF(inode), 0, sizeof(NFS_COOKIEVERF(inode)));
dfprintk(PAGECACHE, "NFS: (%s/%Ld) data cache invalidated\n",
inode->i_sb->s_id,
(long long)NFS_FILEID(inode));
/* This ensures we revalidate dentries */
nfsi->cache_change_attribute++;
}
dfprintk(PAGECACHE, "NFS: (%s/%Ld) revalidation complete\n",
inode->i_sb->s_id,
(long long)NFS_FILEID(inode));
out:
NFS_FLAGS(inode) &= ~NFS_INO_REVALIDATING;
wake_up(&nfsi->nfs_i_wait);
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)
{
if (!(NFS_FLAGS(inode) & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA))
&& !nfs_attribute_timeout(inode))
return NFS_STALE(inode) ? -ESTALE : 0;
return __nfs_revalidate_inode(server, inode);
}
/**
* 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)) {
/* Mark the attribute cache for revalidation */
nfsi->flags |= NFS_INO_INVALID_ATTR;
/* Directories and symlinks: invalidate page cache too */
if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode))
nfsi->flags |= NFS_INO_INVALID_DATA;
}
nfsi->cache_change_attribute ++;
atomic_dec(&nfsi->data_updates);
}
/**
* nfs_end_data_update_defer
* @inode - pointer to inode
* Declare end of the operations that will update file data
* This will defer marking the inode as needing revalidation
* unless there are no other pending updates.
*/
void nfs_end_data_update_defer(struct inode *inode)
{
struct nfs_inode *nfsi = NFS_I(inode);
if (atomic_dec_and_test(&nfsi->data_updates)) {
/* Mark the attribute cache for revalidation */
nfsi->flags |= NFS_INO_INVALID_ATTR;
/* Directories and symlinks: invalidate page cache too */
if (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode))
nfsi->flags |= NFS_INO_INVALID_DATA;
nfsi->cache_change_attribute ++;
}
}
/**
* nfs_refresh_inode - verify consistency of the inode attribute cache
* @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.
*/
int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
{
struct nfs_inode *nfsi = NFS_I(inode);
loff_t cur_size, new_isize;
int data_unstable;
/* Do we hold a delegation? */
if (nfs_have_delegation(inode, FMODE_READ))
return 0;
/* Are we in the process of updating data on the server? */
data_unstable = nfs_caches_unstable(inode);
if (fattr->valid & NFS_ATTR_FATTR_V4) {
if ((fattr->valid & NFS_ATTR_PRE_CHANGE) != 0
&& nfsi->change_attr == fattr->pre_change_attr)
nfsi->change_attr = fattr->change_attr;
if (!data_unstable && nfsi->change_attr != fattr->change_attr)
nfsi->flags |= NFS_INO_INVALID_ATTR;
}
if ((fattr->valid & NFS_ATTR_FATTR) == 0)
return 0;
/* 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;
cur_size = i_size_read(inode);
new_isize = nfs_size_to_loff_t(fattr->size);
/* 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));
if (timespec_equal(&inode->i_mtime, &fattr->pre_mtime))
memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
}
/* Verify a few of the more important attributes */
if (!data_unstable) {
if (!timespec_equal(&inode->i_mtime, &fattr->mtime)
|| cur_size != new_isize)
nfsi->flags |= NFS_INO_INVALID_ATTR;
} else if (S_ISREG(inode->i_mode) && new_isize > cur_size)
nfsi->flags |= NFS_INO_INVALID_ATTR;
/* 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)
nfsi->flags |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS;
/* Has the link count changed? */
if (inode->i_nlink != fattr->nlink)
nfsi->flags |= NFS_INO_INVALID_ATTR;
if (!timespec_equal(&inode->i_atime, &fattr->atime))
nfsi->flags |= NFS_INO_INVALID_ATIME;
nfsi->read_cache_jiffies = fattr->timestamp;
return 0;
}
/*
* 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.
*/
static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr, unsigned long verifier)
{
struct nfs_inode *nfsi = NFS_I(inode);
__u64 new_size;
loff_t new_isize;
unsigned int invalid = 0;
loff_t cur_isize;
int data_unstable;
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);
if ((fattr->valid & NFS_ATTR_FATTR) == 0)
return 0;
if (nfsi->fileid != fattr->fileid) {
printk(KERN_ERR "%s: inode number mismatch\n"
"expected (%s/0x%Lx), got (%s/0x%Lx)\n",
__FUNCTION__,
inode->i_sb->s_id, (long long)nfsi->fileid,
inode->i_sb->s_id, (long long)fattr->fileid);
goto out_err;
}
/*
* Make sure the inode's type hasn't changed.
*/
if ((inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
goto out_changed;
/*
* Update the read time so we don't revalidate too often.
*/
nfsi->read_cache_jiffies = fattr->timestamp;
/* Are we racing with known updates of the metadata on the server? */
data_unstable = ! nfs_verify_change_attribute(inode, verifier);
/* Check if the file size agrees */
new_size = fattr->size;
new_isize = nfs_size_to_loff_t(fattr->size);
cur_isize = i_size_read(inode);
if (cur_isize != new_size) {
#ifdef NFS_DEBUG_VERBOSE
printk(KERN_DEBUG "NFS: isize change on %s/%ld\n", inode->i_sb->s_id, inode->i_ino);
#endif
/*
* If we have pending writebacks, things can get
* messy.
*/
if (S_ISREG(inode->i_mode) && data_unstable) {
if (new_isize > cur_isize) {
inode->i_size = new_isize;
invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
}
} else {
inode->i_size = new_isize;
invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
}
}
/*
* Note: we don't check inode->i_mtime since pipes etc.
* can change this value in VFS without requiring a
* cache revalidation.
*/
if (!timespec_equal(&inode->i_mtime, &fattr->mtime)) {
memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
#ifdef NFS_DEBUG_VERBOSE
printk(KERN_DEBUG "NFS: mtime change on %s/%ld\n", inode->i_sb->s_id, inode->i_ino);
#endif
if (!data_unstable)
invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
}
if ((fattr->valid & NFS_ATTR_FATTR_V4)
&& nfsi->change_attr != fattr->change_attr) {
#ifdef NFS_DEBUG_VERBOSE
printk(KERN_DEBUG "NFS: change_attr change on %s/%ld\n",
inode->i_sb->s_id, inode->i_ino);
#endif
nfsi->change_attr = fattr->change_attr;
if (!data_unstable)
invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS;
}
memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
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)
invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS;
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;
}
/* Update attrtimeo value if we're out of the unstable period */
if (invalid & NFS_INO_INVALID_ATTR) {
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;
if (!nfs_have_delegation(inode, FMODE_READ))
nfsi->flags |= invalid;
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
/*
* 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);
out_err:
NFS_FLAGS(inode) |= NFS_INO_STALE;
return -ESTALE;
}
/*
* 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;
struct nfs_server *server = NULL;
struct super_block *s;
struct nfs_fh *root;
struct nfs_mount_data *data = raw_data;
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;
}
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 */
s = ERR_PTR(-ENOMEM);
server = kmalloc(sizeof(struct nfs_server), GFP_KERNEL);
if (!server)
goto out_err;
memset(server, 0, sizeof(struct nfs_server));
/* Zero out the NFS state stuff */
init_nfsv4_state(server);
root = &server->fh;
if (data->flags & NFS_MOUNT_VER3)
root->size = data->root.size;
else
root->size = NFS2_FHSIZE;
s = ERR_PTR(-EINVAL);
if (root->size > sizeof(root->data)) {
dprintk("%s: invalid root filehandle\n", __FUNCTION__);
goto out_err;
}
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) {
dprintk("%s: mount program didn't pass remote address!\n",
__FUNCTION__);
goto out_err;
}
/* 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;
}
s = sget(fs_type, nfs_compare_super, nfs_set_super, server);
if (IS_ERR(s) || s->s_root)
goto out_rpciod_down;
s->s_flags = flags;
error = nfs_fill_super(s, data, flags & MS_VERBOSE ? 1 : 0);
if (error) {
up_write(&s->s_umount);
deactivate_super(s);
return ERR_PTR(error);
}
s->s_flags |= MS_ACTIVE;
return s;
out_rpciod_down:
rpciod_down();
out_err:
kfree(server);
return s;
}
static void nfs_kill_super(struct super_block *s)
{
struct nfs_server *server = NFS_SB(s);
kill_anon_super(s);
if (server->client != NULL && !IS_ERR(server->client))
rpc_shutdown_client(server->client);
if (server->client_sys != NULL && !IS_ERR(server->client_sys))
rpc_shutdown_client(server->client_sys);
if (!(server->flags & NFS_MOUNT_NONLM))
lockd_down(); /* release rpc.lockd */
rpciod_down(); /* release rpciod */
if (server->hostname != NULL)
kfree(server->hostname);
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,
};
/*
* 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! */
if (nfsi->delegation != NULL)
nfs_inode_return_delegation(inode);
/* 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;
int proto, err = -EIO;
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;
/* Initialize timeout values */
timeparms.to_initval = data->timeo * HZ / 10;
timeparms.to_retries = data->retrans;
timeparms.to_exponential = 1;
if (!timeparms.to_retries)
timeparms.to_retries = 5;
proto = data->proto;
/* Which IP protocol do we use? */
switch (proto) {
case IPPROTO_TCP:
timeparms.to_maxval = RPC_MAX_TCP_TIMEOUT;
if (!timeparms.to_initval)
timeparms.to_initval = 600 * HZ / 10;
break;
case IPPROTO_UDP:
timeparms.to_maxval = RPC_MAX_UDP_TIMEOUT;
if (!timeparms.to_initval)
timeparms.to_initval = 11 * HZ / 10;
break;
default:
return -EINVAL;
}
clp = nfs4_get_client(&server->addr.sin_addr);
if (!clp) {
dprintk("%s: failed to create NFS4 client.\n", __FUNCTION__);
return -EIO;
}
/* Now create transport and client */
authflavour = RPC_AUTH_UNIX;
if (data->auth_flavourlen != 0) {
if (data->auth_flavourlen != 1) {
dprintk("%s: Invalid number of RPC auth flavours %d.\n",
__FUNCTION__, data->auth_flavourlen);
err = -EINVAL;
goto out_fail;
}
if (copy_from_user(&authflavour, data->auth_flavours, sizeof(authflavour))) {
err = -EFAULT;
goto out_fail;
}
}
down_write(&clp->cl_sem);
if (clp->cl_rpcclient == NULL) {
xprt = xprt_create_proto(proto, &server->addr, &timeparms);
if (IS_ERR(xprt)) {
up_write(&clp->cl_sem);
err = PTR_ERR(xprt);
dprintk("%s: cannot create RPC transport. Error = %d\n",
__FUNCTION__, err);
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);
dprintk("%s: cannot create RPC client. Error = %d\n",
__FUNCTION__, err);
goto out_fail;
}
clnt->cl_intr = 1;
clnt->cl_softrtry = 1;
clnt->cl_chatty = 1;
clp->cl_rpcclient = clnt;
clp->cl_cred = rpcauth_lookupcred(clnt->cl_auth, 0);
if (IS_ERR(clp->cl_cred)) {
up_write(&clp->cl_sem);
err = PTR_ERR(clp->cl_cred);
clp->cl_cred = NULL;
goto out_fail;
}
memcpy(clp->cl_ipaddr, server->ip_addr, sizeof(clp->cl_ipaddr));
nfs_idmap_new(clp);
}
if (list_empty(&clp->cl_superblocks)) {
err = nfs4_init_client(clp);
if (err != 0) {
up_write(&clp->cl_sem);
goto out_fail;
}
}
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)) {
err = PTR_ERR(clnt);
dprintk("%s: cannot create RPC client. Error = %d\n",
__FUNCTION__, err);
return err;
}
server->client = clnt;
if (server->nfs4_state->cl_idmap == NULL) {
dprintk("%s: failed to create idmapper.\n", __FUNCTION__);
return -ENOMEM;
}
if (clnt->cl_auth->au_flavor != authflavour) {
if (rpcauth_create(authflavour, clnt) == NULL) {
dprintk("%s: couldn't create credcache!\n", __FUNCTION__);
return -ENOMEM;
}
}
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)) {
if (p != NULL)
kfree(p);
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;
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__);
return ERR_PTR(-EINVAL);
}
server = kmalloc(sizeof(struct nfs_server), GFP_KERNEL);
if (!server)
return ERR_PTR(-ENOMEM);
memset(server, 0, sizeof(struct nfs_server));
/* Zero out the NFS state stuff */
init_nfsv4_state(server);
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) {
dprintk("%s: mount program didn't pass remote IP address!\n",
__FUNCTION__);
s = ERR_PTR(-EINVAL);
goto out_free;
}
/* 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;
}
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;
error = nfs4_fill_super(s, data, flags & MS_VERBOSE ? 1 : 0);
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:
if (server->mnt_path)
kfree(server->mnt_path);
if (server->hostname)
kfree(server->hostname);
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);
rpciod_down(); /* release rpciod */
destroy_nfsv4_state(server);
if (server->hostname != NULL)
kfree(server->hostname);
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,
};
#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)
#define register_nfs4fs() register_filesystem(&nfs4_fs_type)
#define unregister_nfs4fs() unregister_filesystem(&nfs4_fs_type)
#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;
nfsi->flags = 0;
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;
init_waitqueue_head(&nfsi->nfs_i_wait);
nfs4_init_once(nfsi);
}
}
static int nfs_init_inodecache(void)
{
nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
sizeof(struct nfs_inode),
0, SLAB_RECLAIM_ACCOUNT,
init_once, NULL);
if (nfs_inode_cachep == NULL)
return -ENOMEM;
return 0;
}
static void nfs_destroy_inodecache(void)
{
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
nfs_destroy_writepagecache();
#ifdef CONFIG_NFS_DIRECTIO
out0:
nfs_destroy_directcache();
#endif
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)
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