/*
* 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>
#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.
*
* For the moment, though, we instead set it to RPC_MAXREQS, which
* is the maximum number of simultaneous RPC requests on the wire.
*/
#define NFS_MAX_READAHEAD RPC_MAXREQS
void nfs_zap_caches(struct inode *);
static void nfs_invalidate_inode(struct inode *);
static struct inode *nfs_alloc_inode(struct super_block *sb);
static void nfs_destroy_inode(struct inode *);
static void nfs_write_inode(struct inode *,int);
static void nfs_delete_inode(struct inode *);
static void nfs_put_super(struct super_block *);
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 super_operations nfs_sops = {
.alloc_inode = nfs_alloc_inode,
.destroy_inode = nfs_destroy_inode,
.write_inode = nfs_write_inode,
.delete_inode = nfs_delete_inode,
.put_super = nfs_put_super,
.statfs = nfs_statfs,
.clear_inode = nfs_clear_inode,
.umount_begin = nfs_umount_begin,
.show_options = nfs_show_options,
};
/*
* RPC cruft for NFS
*/
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
};
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 void
nfs_write_inode(struct inode *inode, int sync)
{
int flags = sync ? FLUSH_WAIT : 0;
nfs_commit_file(inode, NULL, 0, 0, flags);
}
static void
nfs_delete_inode(struct inode * inode)
{
dprintk("NFS: delete_inode(%s/%ld)\n", inode->i_sb->s_id, inode->i_ino);
/*
* The following can never actually 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 = nfsi->mm_cred;
if (cred)
put_rpccred(cred);
cred = nfsi->cache_access.cred;
if (cred)
put_rpccred(cred);
}
void
nfs_put_super(struct super_block *sb)
{
struct nfs_server *server = NFS_SB(sb);
nfs4_renewd_prepare_shutdown(server);
if (server->client != NULL)
rpc_shutdown_client(server->client);
if (server->client_sys != NULL)
rpc_shutdown_client(server->client_sys);
if (!(server->flags & NFS_MOUNT_NONLM))
lockd_down(); /* release rpc.lockd */
rpciod_down(); /* release rpciod */
destroy_nfsv4_state(server);
kfree(server->hostname);
}
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 int
nfs_get_root(struct inode **rooti, rpc_authflavor_t authflavor, struct super_block *sb, struct nfs_fh *rootfh)
{
struct nfs_server *server = NFS_SB(sb);
struct nfs_fattr fattr = { };
int error;
error = server->rpc_ops->getroot(server, rootfh, &fattr);
if (error == -EACCES && authflavor > RPC_AUTH_MAXFLAVOR) {
/*
* Some authentication types (gss/krb5, most notably)
* are such that root won't be able to present a
* credential for GETATTR (ie, getroot()).
*
* We still want the mount to succeed.
*
* So we fake the attr values and mark the inode as such.
* On the first succesful traversal, we fix everything.
* The auth type test isn't quite correct, but whatever.
*/
dfprintk(VFS, "NFS: faking root inode\n");
fattr.fileid = 1;
fattr.nlink = 2; /* minimum for a dir */
fattr.type = NFDIR;
fattr.mode = S_IFDIR|S_IRUGO|S_IXUGO;
fattr.size = 4096;
fattr.du.nfs3.used = 1;
fattr.valid = NFS_ATTR_FATTR|NFS_ATTR_FATTR_V3;
} else if (error < 0) {
printk(KERN_NOTICE "nfs_get_root: getattr error = %d\n", -error);
*rooti = NULL; /* superfluous ... but safe */
return error;
}
*rooti = nfs_fhget(sb, rootfh, &fattr);
if (error == -EACCES && authflavor > RPC_AUTH_MAXFLAVOR) {
if (*rooti) {
NFS_FLAGS(*rooti) |= NFS_INO_FAKE_ROOT;
NFS_CACHEINV((*rooti));
error = 0;
}
}
return error;
}
/*
* 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 = NULL;
struct nfs_fattr fattr;
struct nfs_fsinfo fsinfo = {
.fattr = &fattr,
};
struct nfs_pathconf pathinfo = {
.fattr = &fattr,
};
/* 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;
/* Did getting the root inode fail? */
if (nfs_get_root(&root_inode, authflavor, sb, &server->fh) < 0)
goto out_no_root;
sb->s_root = d_alloc_root(root_inode);
if (!sb->s_root)
goto out_no_root;
sb->s_root->d_op = server->rpc_ops->dentry_ops;
/* Get some general file system info */
if (server->rpc_ops->fsinfo(server, &server->fh, &fsinfo) < 0) {
printk(KERN_NOTICE "NFS: cannot retrieve file system info.\n");
goto out_no_root;
}
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 (sb->s_blocksize == 0) {
if (fsinfo.wtmult == 0) {
sb->s_blocksize = 512;
sb->s_blocksize_bits = 9;
} else
sb->s_blocksize = nfs_block_bits(fsinfo.wtmult,
&sb->s_blocksize_bits);
}
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);
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;
}
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;
/* 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_free_all:
if (root_inode)
iput(root_inode);
return -EINVAL;
out_no_root:
printk("nfs_read_super: get root inode failed\n");
goto out_free_all;
}
/*
* 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 (xprt == NULL) {
printk(KERN_WARNING "NFS: cannot create RPC transport.\n");
goto out_fail;
}
clnt = rpc_create_client(xprt, server->hostname, &nfs_program,
server->rpc_ops->version, data->pseudoflavor);
if (clnt == NULL) {
printk(KERN_WARNING "NFS: cannot create RPC client.\n");
goto out_fail;
}
clnt->cl_intr = (server->flags & NFS_MOUNT_INTR) ? 1 : 0;
clnt->cl_softrtry = (server->flags & NFS_MOUNT_SOFT) ? 1 : 0;
clnt->cl_droppriv = (server->flags & NFS_MOUNT_BROKEN_SUID) ? 1 : 0;
clnt->cl_chatty = 1;
return clnt;
out_fail:
if (xprt)
xprt_destroy(xprt);
return NULL;
}
/*
* 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;
int err = -EIO;
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;
server->namelen = data->namlen;
server->hostname = kmalloc(strlen(data->hostname) + 1, GFP_KERNEL);
if (!server->hostname)
goto out_fail;
strcpy(server->hostname, data->hostname);
/* Check NFS protocol revision and initialize RPC op vector
* and file handle pool. */
if (server->flags & NFS_MOUNT_VER3) {
#ifdef CONFIG_NFS_V3
server->rpc_ops = &nfs_v3_clientops;
server->caps |= NFS_CAP_READDIRPLUS;
if (data->version < 4) {
printk(KERN_NOTICE "NFS: NFSv3 not supported by mount program.\n");
goto out_fail;
}
#else
printk(KERN_NOTICE "NFS: NFSv3 not supported.\n");
goto out_fail;
#endif
} else {
server->rpc_ops = &nfs_v2_clientops;
}
/* 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 (server->client == NULL)
goto out_fail;
/* RFC 2623, sec 2.3.2 */
if (authflavor != RPC_AUTH_UNIX) {
server->client_sys = rpc_clone_client(server->client);
if (server->client_sys == NULL)
goto out_shutdown;
if (!rpcauth_create(RPC_AUTH_UNIX, server->client_sys))
goto out_shutdown;
} else {
atomic_inc(&server->client->cl_count);
server->client_sys = server->client;
}
/* Fire up rpciod if not yet running */
if (rpciod_up() != 0) {
printk(KERN_WARNING "NFS: couldn't start rpciod!\n");
goto out_shutdown;
}
sb->s_op = &nfs_sops;
err = nfs_sb_init(sb, authflavor);
if (err != 0)
goto out_noinit;
if (server->flags & NFS_MOUNT_VER3) {
if (server->namelen == 0 || server->namelen > NFS3_MAXNAMLEN)
server->namelen = NFS3_MAXNAMLEN;
} else {
if (server->namelen == 0 || server->namelen > NFS2_MAXNAMLEN)
server->namelen = NFS2_MAXNAMLEN;
}
/* Check whether to start the lockd process */
if (!(server->flags & NFS_MOUNT_NONLM))
lockd_up();
return 0;
out_noinit:
rpciod_down();
out_shutdown:
if (server->client)
rpc_shutdown_client(server->client);
if (server->client_sys)
rpc_shutdown_client(server->client_sys);
out_fail:
if (server->hostname)
kfree(server->hostname);
return err;
}
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;
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" },
{ NFS_MOUNT_BROKEN_SUID, ",broken_suid", "" },
{ 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)
{
NFS_ATTRTIMEO(inode) = NFS_MINATTRTIMEO(inode);
NFS_ATTRTIMEO_UPDATE(inode) = jiffies;
invalidate_remote_inode(inode);
memset(NFS_COOKIEVERF(inode), 0, sizeof(NFS_COOKIEVERF(inode)));
NFS_CACHEINV(inode);
}
/*
* 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 (memcmp(NFS_FH(inode), fh, sizeof(struct nfs_fh)) != 0)
return 0;
if (is_bad_inode(inode))
return 0;
/* Force an attribute cache update if inode->i_count == 0 */
if (!atomic_read(&inode->i_count))
NFS_CACHEINV(inode);
return 1;
}
static int
nfs_init_locked(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;
NFS_FILEID(inode) = fattr->fileid;
memcpy(NFS_FH(inode), fh, sizeof(struct nfs_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;
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_file_inode_operations;
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;
nfsi->read_cache_ctime = fattr->ctime;
nfsi->read_cache_mtime = fattr->mtime;
nfsi->cache_mtime_jiffies = fattr->timestamp;
nfsi->read_cache_isize = fattr->size;
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;
/* 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();
/*
* Make sure the inode is up-to-date.
*/
error = nfs_revalidate_inode(NFS_SERVER(inode),inode);
if (error) {
#ifdef NFS_PARANOIA
printk("nfs_setattr: revalidate failed, error=%d\n", error);
#endif
goto out;
}
if (!S_ISREG(inode->i_mode)) {
attr->ia_valid &= ~ATTR_SIZE;
if (attr->ia_valid == 0)
goto out;
} else {
filemap_fdatawrite(inode->i_mapping);
error = nfs_wb_all(inode);
filemap_fdatawait(inode->i_mapping);
if (error)
goto out;
/* Optimize away unnecessary truncates */
if ((attr->ia_valid & ATTR_SIZE) && i_size_read(inode) == attr->ia_size)
attr->ia_valid &= ~ATTR_SIZE;
}
if (!attr->ia_valid)
goto out;
error = NFS_PROTO(inode)->setattr(dentry, &fattr, attr);
if (error)
goto out;
/*
* If we changed the size or mtime, update the inode
* now to avoid invalidating the page cache.
*/
if (attr->ia_valid & ATTR_SIZE) {
if (attr->ia_size != fattr.size)
printk("nfs_setattr: attr=%Ld, fattr=%Ld??\n",
(long long) attr->ia_size, (long long)fattr.size);
vmtruncate(inode, attr->ia_size);
}
/*
* If we changed the size or mtime, update the inode
* now to avoid invalidating the page cache.
*/
if (!(fattr.valid & NFS_ATTR_WCC)) {
struct nfs_inode *nfsi = NFS_I(inode);
fattr.pre_size = nfsi->read_cache_isize;
fattr.pre_mtime = nfsi->read_cache_mtime;
fattr.pre_ctime = nfsi->read_cache_ctime;
fattr.valid |= NFS_ATTR_WCC;
}
/* Force an attribute cache update */
NFS_CACHEINV(inode);
error = nfs_refresh_inode(inode, &fattr);
out:
unlock_kernel();
return error;
}
/*
* Wait for the inode to get unlocked.
* (Used for NFS_INO_LOCKED and NFS_INO_REVALIDATING).
*/
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;
int err = nfs_revalidate_inode(NFS_SERVER(inode), inode);
if (!err)
generic_fillattr(inode, stat);
return err;
}
/*
* Ensure that mmap has a recent RPC credential for use when writing out
* shared pages
*/
void
nfs_set_mmcred(struct inode *inode, struct rpc_cred *cred)
{
struct rpc_cred **p = &NFS_I(inode)->mm_cred,
*oldcred = *p;
*p = get_rpccred(cred);
if (oldcred)
put_rpccred(oldcred);
}
/*
* These are probably going to contain hooks for
* allocating and releasing RPC credentials for
* the file. I'll have to think about Tronds patch
* a bit more..
*/
int nfs_open(struct inode *inode, struct file *filp)
{
struct rpc_auth *auth;
struct rpc_cred *cred;
auth = NFS_CLIENT(inode)->cl_auth;
cred = rpcauth_lookupcred(auth, 0);
filp->private_data = cred;
if (filp->f_mode & FMODE_WRITE)
nfs_set_mmcred(inode, cred);
return 0;
}
int nfs_release(struct inode *inode, struct file *filp)
{
struct rpc_cred *cred;
lock_kernel();
cred = nfs_file_cred(filp);
if (cred)
put_rpccred(cred);
unlock_kernel();
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;
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) && inode != inode->i_sb->s_root->d_inode)
goto out_nowait;
if (NFS_FAKE_ROOT(inode)) {
dfprintk(VFS, "NFS: not revalidating fake root\n");
status = 0;
goto out_nowait;
}
while (NFS_REVALIDATING(inode)) {
status = nfs_wait_on_inode(inode, NFS_INO_REVALIDATING);
if (status < 0)
goto out_nowait;
if (time_before(jiffies,NFS_READTIME(inode)+NFS_ATTRTIMEO(inode))) {
status = NFS_STALE(inode) ? -ESTALE : 0;
goto out_nowait;
}
}
NFS_FLAGS(inode) |= NFS_INO_REVALIDATING;
status = NFS_PROTO(inode)->getattr(inode, &fattr);
if (status) {
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_FLAGS(inode) |= NFS_INO_STALE;
if (inode != inode->i_sb->s_root->d_inode)
remove_inode_hash(inode);
}
goto out;
}
status = nfs_refresh_inode(inode, &fattr);
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;
}
dfprintk(PAGECACHE, "NFS: (%s/%Ld) revalidation complete\n",
inode->i_sb->s_id,
(long long)NFS_FILEID(inode));
NFS_FLAGS(inode) &= ~NFS_INO_STALE;
out:
NFS_FLAGS(inode) &= ~NFS_INO_REVALIDATING;
wake_up(&NFS_I(inode)->nfs_i_wait);
out_nowait:
unlock_kernel();
return status;
}
/*
* nfs_fattr_obsolete - Test if attribute data is newer than cached data
* @inode: inode
* @fattr: attributes to test
*
* Avoid stuffing the attribute cache with obsolete information.
* We always accept updates if the attribute cache timed out, or if
* fattr->ctime is newer than our cached value.
* If fattr->ctime matches the cached value, we still accept the update
* if it increases the file size.
*/
static inline
int nfs_fattr_obsolete(struct inode *inode, struct nfs_fattr *fattr)
{
struct nfs_inode *nfsi = NFS_I(inode);
long cdif;
if (time_after(jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo))
goto out_valid;
cdif = fattr->ctime.tv_sec - nfsi->read_cache_ctime.tv_sec;
if (cdif == 0)
cdif = fattr->ctime.tv_nsec - nfsi->read_cache_ctime.tv_nsec;
if (cdif > 0)
goto out_valid;
/* Ugh... */
if (cdif == 0 && fattr->size > nfsi->read_cache_isize)
goto out_valid;
return -1;
out_valid:
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.
*/
int
__nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
{
struct nfs_inode *nfsi = NFS_I(inode);
__u64 new_size;
loff_t new_isize;
int invalid = 0;
int mtime_update = 0;
loff_t cur_isize;
dfprintk(VFS, "NFS: refresh_inode(%s/%ld ct=%d info=0x%x)\n",
inode->i_sb->s_id, inode->i_ino,
atomic_read(&inode->i_count), fattr->valid);
/* First successful call after mount, fill real data. */
if (NFS_FAKE_ROOT(inode)) {
dfprintk(VFS, "NFS: updating fake root\n");
nfsi->fileid = fattr->fileid;
NFS_FLAGS(inode) &= ~NFS_INO_FAKE_ROOT;
}
if (nfsi->fileid != fattr->fileid) {
printk(KERN_ERR "nfs_refresh_inode: inode number mismatch\n"
"expected (%s/0x%Lx), got (%s/0x%Lx)\n",
inode->i_sb->s_id, (long long)nfsi->fileid,
inode->i_sb->s_id, (long long)fattr->fileid);
goto out_err;
}
/* Throw out obsolete READDIRPLUS attributes */
if (time_before(fattr->timestamp, NFS_READTIME(inode)))
return 0;
/*
* Make sure the inode's type hasn't changed.
*/
if ((inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
goto out_changed;
new_size = fattr->size;
new_isize = nfs_size_to_loff_t(fattr->size);
/* Avoid races */
if (nfs_fattr_obsolete(inode, fattr))
goto out_nochange;
/*
* Update the read time so we don't revalidate too often.
*/
nfsi->read_cache_jiffies = fattr->timestamp;
/*
* Note: NFS_CACHE_ISIZE(inode) reflects the state of the cache.
* NOT inode->i_size!!!
*/
if (nfsi->read_cache_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
invalid = 1;
}
/*
* 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(&nfsi->read_cache_mtime, &fattr->mtime)) {
#ifdef NFS_DEBUG_VERBOSE
printk(KERN_DEBUG "NFS: mtime change on %s/%ld\n", inode->i_sb->s_id, inode->i_ino);
#endif
invalid = 1;
mtime_update = 1;
}
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
invalid = 1;
}
/* Check Weak Cache Consistency data.
* If size and mtime match the pre-operation values, we can
* assume that any attribute changes were caused by our NFS
* operation, so there's no need to invalidate the caches.
*/
if ((fattr->valid & NFS_ATTR_PRE_CHANGE)
&& nfsi->change_attr == fattr->pre_change_attr) {
invalid = 0;
}
else if ((fattr->valid & NFS_ATTR_WCC)
&& nfsi->read_cache_isize == fattr->pre_size
&& timespec_equal(&nfsi->read_cache_mtime, &fattr->pre_mtime)) {
invalid = 0;
}
/*
* If we have pending writebacks, things can get
* messy.
*/
cur_isize = i_size_read(inode);
if (nfs_have_writebacks(inode) && new_isize < cur_isize)
new_isize = cur_isize;
nfsi->read_cache_ctime = fattr->ctime;
inode->i_ctime = fattr->ctime;
inode->i_atime = fattr->atime;
if (mtime_update) {
if (invalid)
nfsi->cache_mtime_jiffies = fattr->timestamp;
nfsi->read_cache_mtime = fattr->mtime;
inode->i_mtime = fattr->mtime;
}
nfsi->read_cache_isize = new_size;
i_size_write(inode, new_isize);
if (inode->i_mode != fattr->mode ||
inode->i_uid != fattr->uid ||
inode->i_gid != fattr->gid) {
struct rpc_cred **cred = &NFS_I(inode)->cache_access.cred;
if (*cred) {
put_rpccred(*cred);
*cred = NULL;
}
}
if (fattr->valid & NFS_ATTR_FATTR_V4)
nfsi->change_attr = fattr->change_attr;
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 (invalid) {
nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
nfsi->attrtimeo_timestamp = jiffies;
invalidate_remote_inode(inode);
memset(NFS_COOKIEVERF(inode), 0, sizeof(NFS_COOKIEVERF(inode)));
} 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;
}
return 0;
out_nochange:
if (!timespec_equal(&fattr->atime, &inode->i_atime))
inode->i_atime = fattr->atime;
return 0;
out_changed:
/*
* Big trouble! The inode has become a different object.
*/
#ifdef NFS_PARANOIA
printk(KERN_DEBUG "nfs_refresh_inode: inode %ld mode changed, %07o to %07o\n",
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:
return -EIO;
}
/*
* 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 !memcmp(&old->fh, &server->fh, sizeof(struct nfs_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;
struct super_block *s;
struct nfs_fh *root;
struct nfs_mount_data *data = raw_data;
if (!data) {
printk("nfs_read_super: missing data argument\n");
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);
root = &server->fh;
memcpy(root, &data->root, sizeof(*root));
if (root->size < sizeof(root->data))
memset(root->data+root->size, 0, sizeof(root->data)-root->size);
if (data->version != NFS_MOUNT_VERSION) {
printk("nfs warning: mount version %s than kernel\n",
data->version < NFS_MOUNT_VERSION ? "older" : "newer");
if (data->version < 2)
data->namlen = 0;
if (data->version < 3)
data->bsize = 0;
if (data->version < 4) {
data->flags &= ~NFS_MOUNT_VER3;
memset(root, 0, sizeof(*root));
root->size = NFS2_FHSIZE;
memcpy(root->data, data->old_root.data, NFS2_FHSIZE);
}
if (data->version < 5)
data->flags &= ~NFS_MOUNT_SECFLAVOUR;
}
if (root->size > sizeof(root->data)) {
printk("nfs_get_sb: invalid root filehandle\n");
kfree(server);
return ERR_PTR(-EINVAL);
}
/* 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) {
printk("NFS: mount program didn't pass remote address!\n");
kfree(server);
return ERR_PTR(-EINVAL);
}
s = sget(fs_type, nfs_compare_super, nfs_set_super, server);
if (IS_ERR(s) || s->s_root) {
kfree(server);
return s;
}
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;
}
static void nfs_kill_super(struct super_block *s)
{
struct nfs_server *server = NFS_SB(s);
kill_anon_super(s);
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,
};
#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,
.put_super = nfs_put_super,
.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);
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);
list_del(&state->inode_states);
nfs4_put_open_state(state);
}
/* Now call standard NFS clear_inode() code */
nfs_clear_inode(inode);
}
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;
/* NFSv4 doesn't use NLM locking */
server->flags |= NFS_MOUNT_NONLM;
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) {
printk(KERN_WARNING "NFS: failed to create NFS4 client.\n");
goto out_fail;
}
/* Now create transport and client */
authflavour = RPC_AUTH_UNIX;
if (data->auth_flavourlen != 0) {
if (data->auth_flavourlen > 1)
printk(KERN_INFO "NFS: cannot yet deal with multiple auth flavours.\n");
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 (xprt == NULL) {
up_write(&clp->cl_sem);
printk(KERN_WARNING "NFS: cannot create RPC transport.\n");
goto out_fail;
}
clnt = rpc_create_client(xprt, server->hostname, &nfs_program,
server->rpc_ops->version, authflavour);
if (clnt == NULL) {
up_write(&clp->cl_sem);
printk(KERN_WARNING "NFS: cannot create RPC client.\n");
xprt_destroy(xprt);
goto out_fail;
}
clnt->cl_chatty = 1;
clp->cl_rpcclient = clnt;
clp->cl_cred = rpcauth_lookupcred(clnt->cl_auth, 0);
memcpy(clp->cl_ipaddr, server->ip_addr, sizeof(clp->cl_ipaddr));
nfs_idmap_new(clp);
}
if (list_empty(&clp->cl_superblocks))
clear_bit(NFS4CLNT_OK, &clp->cl_state);
list_add_tail(&server->nfs4_siblings, &clp->cl_superblocks);
clnt = rpc_clone_client(clp->cl_rpcclient);
server->nfs4_state = clp;
up_write(&clp->cl_sem);
clp = NULL;
if (clnt == NULL) {
printk(KERN_WARNING "NFS: cannot create RPC client.\n");
goto out_remove_list;
}
if (server->nfs4_state->cl_idmap == NULL) {
printk(KERN_WARNING "NFS: failed to create idmapper.\n");
goto out_shutdown;
}
clnt->cl_intr = (server->flags & NFS4_MOUNT_INTR) ? 1 : 0;
clnt->cl_softrtry = (server->flags & NFS4_MOUNT_SOFT) ? 1 : 0;
server->client = clnt;
if (clnt->cl_auth->au_flavor != authflavour) {
if (rpcauth_create(authflavour, clnt) == NULL) {
printk(KERN_WARNING "NFS: couldn't create credcache!\n");
goto out_shutdown;
}
}
/* Fire up rpciod if not yet running */
if (rpciod_up() != 0) {
printk(KERN_WARNING "NFS: couldn't start rpciod!\n");
goto out_shutdown;
}
sb->s_op = &nfs4_sops;
err = nfs_sb_init(sb, authflavour);
if (err == 0)
return 0;
rpciod_down();
out_shutdown:
rpc_shutdown_client(server->client);
out_remove_list:
down_write(&server->nfs4_state->cl_sem);
list_del_init(&server->nfs4_siblings);
up_write(&server->nfs4_state->cl_sem);
destroy_nfsv4_state(server);
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) {
printk("nfs_read_super: missing data argument\n");
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);
if (data->version != NFS4_MOUNT_VERSION) {
printk("nfs warning: mount version %s than kernel\n",
data->version < NFS_MOUNT_VERSION ? "older" : "newer");
}
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) {
printk("NFS: mount program didn't pass remote IP address!\n");
s = ERR_PTR(-EINVAL);
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 struct file_system_type nfs4_fs_type = {
.owner = THIS_MODULE,
.name = "nfs4",
.get_sb = nfs4_get_sb,
.kill_sb = nfs_kill_super,
.fs_flags = FS_ODD_RENAME|FS_REVAL_DOT,
};
#define nfs4_zero_state(nfsi) \
do { \
INIT_LIST_HEAD(&(nfsi)->open_states); \
} while(0)
#define register_nfs4fs() register_filesystem(&nfs4_fs_type)
#define unregister_nfs4fs() unregister_filesystem(&nfs4_fs_type)
#else
#define nfs4_zero_state(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 int nfs_destroy_readpagecache(void);
extern int nfs_init_writepagecache(void);
extern int nfs_destroy_writepagecache(void);
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;
nfsi->mm_cred = NULL;
nfs4_zero_state(nfsi);
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);
INIT_LIST_HEAD(&nfsi->dirty);
INIT_LIST_HEAD(&nfsi->commit);
INIT_RADIX_TREE(&nfsi->nfs_page_tree, GFP_ATOMIC);
nfsi->ndirty = 0;
nfsi->ncommit = 0;
nfsi->npages = 0;
init_waitqueue_head(&nfsi->nfs_i_wait);
}
}
int nfs_init_inodecache(void)
{
nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
sizeof(struct nfs_inode),
0, SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT,
init_once, NULL);
if (nfs_inode_cachep == NULL)
return -ENOMEM;
return 0;
}
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_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:
rpc_proc_unregister("nfs");
nfs_destroy_writepagecache();
out1:
nfs_destroy_readpagecache();
out2:
nfs_destroy_inodecache();
out3:
nfs_destroy_nfspagecache();
out4:
return err;
}
static void __exit exit_nfs_fs(void)
{
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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