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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/sched.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/string.h>
#include <linux/stat.h>
#include <linux/errno.h>
#include <linux/locks.h>
#include <linux/unistd.h>
#include <linux/sunrpc/clnt.h>
#include <linux/sunrpc/stats.h>
#include <linux/nfs_fs.h>
#include <linux/lockd/bind.h>
#include <asm/system.h>
#include <asm/uaccess.h>
#define NFSDBG_FACILITY NFSDBG_VFS
#define NFS_PARANOIA 1
static void nfs_read_inode(struct inode *);
static void nfs_put_inode(struct inode *);
static void nfs_delete_inode(struct inode *);
static int nfs_notify_change(struct dentry *, struct iattr *);
static void nfs_put_super(struct super_block *);
static int nfs_statfs(struct super_block *, struct statfs *, int);
static struct super_operations nfs_sops = {
nfs_read_inode, /* read inode */
NULL, /* write inode */
nfs_put_inode, /* put inode */
nfs_delete_inode, /* delete inode */
nfs_notify_change, /* notify change */
nfs_put_super, /* put superblock */
NULL, /* write superblock */
nfs_statfs, /* stat filesystem */
NULL
};
struct rpc_stat nfs_rpcstat = { &nfs_program };
/*
* The "read_inode" function doesn't actually do anything:
* the real data is filled in later in nfs_fhget. Here we
* just mark the cache times invalid, and zero out i_mode
* (the latter makes "nfs_refresh_inode" do the right thing
* wrt pipe inodes)
*/
static void
nfs_read_inode(struct inode * inode)
{
inode->i_blksize = inode->i_sb->s_blocksize;
inode->i_mode = 0;
inode->i_rdev = 0;
inode->i_op = NULL;
NFS_CACHEINV(inode);
NFS_ATTRTIMEO(inode) = NFS_MINATTRTIMEO(inode);
}
static void
nfs_put_inode(struct inode * inode)
{
dprintk("NFS: put_inode(%x/%ld)\n", inode->i_dev, inode->i_ino);
/*
* We want to get rid of unused inodes ...
*/
if (inode->i_count == 1)
inode->i_nlink = 0;
}
static void
nfs_delete_inode(struct inode * inode)
{
int failed;
dprintk("NFS: delete_inode(%x/%ld)\n", inode->i_dev, inode->i_ino);
/*
* Flush out any pending write requests ...
*/
if (NFS_WRITEBACK(inode) != NULL) {
unsigned long timeout = jiffies + 5*HZ;
#ifdef NFS_DEBUG_VERBOSE
printk("nfs_delete_inode: inode %ld has pending RPC requests\n", inode->i_ino);
#endif
nfs_invalidate_pages(inode);
while (NFS_WRITEBACK(inode) != NULL && jiffies < timeout) {
current->state = TASK_INTERRUPTIBLE;
current->timeout = jiffies + HZ/10;
schedule();
}
current->state = TASK_RUNNING;
if (NFS_WRITEBACK(inode) != NULL)
printk("NFS: Arghhh, stuck RPC requests!\n");
}
failed = nfs_check_failed_request(inode);
if (failed)
printk("NFS: inode %ld had %d failed requests\n",
inode->i_ino, failed);
clear_inode(inode);
}
void
nfs_put_super(struct super_block *sb)
{
struct nfs_server *server = &sb->u.nfs_sb.s_server;
struct rpc_clnt *rpc;
/*
* Lock the super block while we bring down the daemons.
*/
lock_super(sb);
if ((rpc = server->client) != NULL)
rpc_shutdown_client(rpc);
if (!(server->flags & NFS_MOUNT_NONLM))
lockd_down(); /* release rpc.lockd */
rpciod_down(); /* release rpciod */
/*
* Invalidate the dircache for this superblock.
*/
nfs_invalidate_dircache_sb(sb);
kfree(server->hostname);
sb->s_dev = 0;
unlock_super(sb);
MOD_DEC_USE_COUNT;
}
/*
* Compute and set NFS server blocksize
*/
static unsigned int
nfs_block_size(unsigned int 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;
/* make sure blocksize is a power of two */
if ((bsize & (bsize - 1)) || nrbitsp) {
unsigned int nrbits;
for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
;
bsize = 1 << nrbits;
if (nrbitsp)
*nrbitsp = nrbits;
if (bsize < NFS_DEF_FILE_IO_BUFFER_SIZE)
bsize = NFS_DEF_FILE_IO_BUFFER_SIZE;
}
return bsize;
}
/*
* 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.
*/
struct super_block *
nfs_read_super(struct super_block *sb, void *raw_data, int silent)
{
struct nfs_mount_data *data = (struct nfs_mount_data *) raw_data;
struct nfs_server *server;
struct rpc_xprt *xprt;
struct rpc_clnt *clnt;
struct nfs_fh *root_fh;
struct inode *root_inode;
unsigned int authflavor;
int tcp;
struct sockaddr_in srvaddr;
struct rpc_timeout timeparms;
MOD_INC_USE_COUNT;
if (!data)
goto out_miss_args;
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;
}
/* We now require that the mount process passes the remote address */
memcpy(&srvaddr, &data->addr, sizeof(srvaddr));
if (srvaddr.sin_addr.s_addr == INADDR_ANY)
goto out_no_remote;
lock_super(sb);
sb->s_magic = NFS_SUPER_MAGIC;
sb->s_op = &nfs_sops;
sb->s_blocksize = nfs_block_size(data->bsize, &sb->s_blocksize_bits);
sb->u.nfs_sb.s_root = data->root;
server = &sb->u.nfs_sb.s_server;
server->rsize = nfs_block_size(data->rsize, NULL);
server->wsize = nfs_block_size(data->wsize, NULL);
server->flags = data->flags;
server->acregmin = data->acregmin*HZ;
server->acregmax = data->acregmax*HZ;
server->acdirmin = data->acdirmin*HZ;
server->acdirmax = data->acdirmax*HZ;
server->hostname = kmalloc(strlen(data->hostname) + 1, GFP_KERNEL);
if (!server->hostname)
goto out_unlock;
strcpy(server->hostname, data->hostname);
/* Which protocol do we use? */
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;
/* Now create transport and client */
xprt = xprt_create_proto(tcp? IPPROTO_TCP : IPPROTO_UDP,
&srvaddr, &timeparms);
if (xprt == NULL)
goto out_no_xprt;
/* Choose authentication flavor */
authflavor = RPC_AUTH_UNIX;
if (data->flags & NFS_MOUNT_SECURE)
authflavor = RPC_AUTH_DES;
else if (data->flags & NFS_MOUNT_KERBEROS)
authflavor = RPC_AUTH_KRB;
clnt = rpc_create_client(xprt, server->hostname, &nfs_program,
NFS_VERSION, authflavor);
if (clnt == NULL)
goto out_no_client;
clnt->cl_intr = (data->flags & NFS_MOUNT_INTR)? 1 : 0;
clnt->cl_softrtry = (data->flags & NFS_MOUNT_SOFT)? 1 : 0;
clnt->cl_chatty = 1;
server->client = clnt;
/* Fire up rpciod if not yet running */
if (rpciod_up() != 0)
goto out_no_iod;
/*
* Keep the super block locked while we try to get
* the root fh attributes.
*/
root_fh = kmalloc(sizeof(struct nfs_fh), GFP_KERNEL);
if (!root_fh)
goto out_no_fh;
*root_fh = data->root;
root_inode = nfs_fhget(sb, &data->root, NULL);
if (!root_inode)
goto out_no_root;
sb->s_root = d_alloc_root(root_inode, NULL);
if (!sb->s_root)
goto out_no_root;
sb->s_root->d_op = &nfs_dentry_operations;
sb->s_root->d_fsdata = root_fh;
/* We're airborne */
unlock_super(sb);
/* Check whether to start the lockd process */
if (!(server->flags & NFS_MOUNT_NONLM))
lockd_up();
return sb;
/* Yargs. It didn't work out. */
out_no_root:
printk("nfs_read_super: get root inode failed\n");
iput(root_inode);
kfree(root_fh);
out_no_fh:
rpciod_down();
goto out_shutdown;
out_no_iod:
printk("NFS: couldn't start rpciod!\n");
out_shutdown:
rpc_shutdown_client(server->client);
goto out_unlock;
out_no_client:
printk("NFS: cannot create RPC client.\n");
xprt_destroy(xprt);
goto out_unlock;
out_no_xprt:
printk("NFS: cannot create RPC transport.\n");
kfree(server->hostname);
out_unlock:
unlock_super(sb);
goto out_fail;
out_no_remote:
printk("NFS: mount program didn't pass remote address!\n");
goto out_fail;
out_miss_args:
printk("nfs_read_super: missing data argument\n");
out_fail:
sb->s_dev = 0;
MOD_DEC_USE_COUNT;
return NULL;
}
static int
nfs_statfs(struct super_block *sb, struct statfs *buf, int bufsiz)
{
int error;
struct nfs_fsinfo res;
struct statfs tmp;
error = nfs_proc_statfs(&sb->u.nfs_sb.s_server, &sb->u.nfs_sb.s_root,
&res);
if (error) {
printk("nfs_statfs: statfs error = %d\n", -error);
res.bsize = res.blocks = res.bfree = res.bavail = 0;
}
tmp.f_type = NFS_SUPER_MAGIC;
tmp.f_bsize = res.bsize;
tmp.f_blocks = res.blocks;
tmp.f_bfree = res.bfree;
tmp.f_bavail = res.bavail;
tmp.f_files = 0;
tmp.f_ffree = 0;
tmp.f_namelen = NAME_MAX;
return copy_to_user(buf, &tmp, bufsiz) ? -EFAULT : 0;
}
/*
* Free all unused dentries in an inode's alias list.
*
* Subtle note: we have to be very careful not to cause
* any IO operations with the stale dentries, as this
* could cause file corruption. But since the dentry
* count is 0 and all pending IO for a dentry has been
* flushed when the count went to 0, we're safe here.
*/
void nfs_free_dentries(struct inode *inode)
{
struct list_head *tmp, *head = &inode->i_dentry;
restart:
tmp = head;
while ((tmp = tmp->next) != head) {
struct dentry *dentry = list_entry(tmp, struct dentry, d_alias);
if (!dentry->d_count) {
printk("nfs_free_dentries: freeing %s/%s, i_count=%d\n",
dentry->d_parent->d_name.name, dentry->d_name.name, inode->i_count);
dget(dentry);
d_drop(dentry);
dput(dentry);
goto restart;
}
}
}
/*
* This is our own version of iget that looks up inodes by file handle
* instead of inode number. We use this technique instead of using
* the vfs read_inode function because there is no way to pass the
* file handle or current attributes into the read_inode function.
*
* Note carefully the special handling of busy inodes (i_count > 1).
* With the Linux 2.1.xx dcache all inodes except hard links must
* have i_count == 1 after iget(). Otherwise, it indicates that the
* server has reused a fileid (i_ino) and we have a stale inode.
*/
struct inode *
nfs_fhget(struct super_block *sb, struct nfs_fh *fhandle,
struct nfs_fattr *fattr)
{
int error, max_count;
struct inode *inode = NULL;
struct nfs_fattr newfattr;
if (!sb)
goto out_bad_args;
if (!fattr) {
fattr = &newfattr;
error = nfs_proc_getattr(&sb->u.nfs_sb.s_server, fhandle,fattr);
if (error)
goto out_bad_attr;
}
retry:
inode = iget(sb, fattr->fileid);
if (!inode)
goto out_no_inode;
#ifdef NFS_PARANOIA
if (inode->i_dev != sb->s_dev)
printk("nfs_fhget: impossible\n");
#endif
if (inode->i_ino != fattr->fileid)
goto out_bad_id;
/*
* Check for busy inodes, and attempt to get rid of any
* unused local references. If successful, we release the
* inode and try again.
*
* Note that the busy test uses the values in the fattr,
* as the inode may have become a different object.
* (We can probably handle modes changes here, too.)
*/
max_count = S_ISDIR(fattr->mode) ? 1 : fattr->nlink;
if (inode->i_count > max_count) {
printk("nfs_fhget: inode %ld busy, i_count=%d, i_nlink=%d\n",
inode->i_ino, inode->i_count, inode->i_nlink);
nfs_free_dentries(inode);
if (inode->i_count > max_count) {
printk("nfs_fhget: inode %ld still busy, i_count=%d\n",
inode->i_ino, inode->i_count);
if (!list_empty(&inode->i_dentry)) {
struct dentry *dentry;
dentry = list_entry(inode->i_dentry.next,
struct dentry, d_alias);
printk("nfs_fhget: killing %s/%s filehandle\n",
dentry->d_parent->d_name.name, dentry->d_name.name);
memset(dentry->d_fsdata, 0, sizeof(*fhandle));
} else
printk("NFS: inode %ld busy, no aliases?\n",
inode->i_ino);
make_bad_inode(inode);
remove_inode_hash(inode);
}
iput(inode);
goto retry;
}
/*
* Check whether the mode has been set, as we only want to
* do this once. (We don't allow inodes to change types.)
*/
if (inode->i_mode == 0) {
inode->i_mode = fattr->mode;
if (S_ISREG(inode->i_mode))
inode->i_op = &nfs_file_inode_operations;
else if (S_ISDIR(inode->i_mode))
inode->i_op = &nfs_dir_inode_operations;
else if (S_ISLNK(inode->i_mode))
inode->i_op = &nfs_symlink_inode_operations;
else if (S_ISCHR(inode->i_mode)) {
inode->i_op = &chrdev_inode_operations;
inode->i_rdev = to_kdev_t(fattr->rdev);
} else if (S_ISBLK(inode->i_mode)) {
inode->i_op = &blkdev_inode_operations;
inode->i_rdev = to_kdev_t(fattr->rdev);
} else if (S_ISFIFO(inode->i_mode))
init_fifo(inode);
else
inode->i_op = NULL;
/*
* Preset the size and mtime, as there's no need
* to invalidate the caches.
*/
inode->i_size = fattr->size;
inode->i_mtime = fattr->mtime.seconds;
NFS_OLDMTIME(inode) = fattr->mtime.seconds;
}
nfs_refresh_inode(inode, fattr);
dprintk("NFS: fhget(%x/%ld ct=%d)\n",
inode->i_dev, inode->i_ino,
inode->i_count);
out:
return inode;
out_bad_args:
printk("nfs_fhget: super block is NULL\n");
goto out;
out_bad_attr:
printk("nfs_fhget: getattr error = %d\n", -error);
goto out;
out_no_inode:
printk("nfs_fhget: iget failed\n");
goto out;
out_bad_id:
printk("nfs_fhget: unexpected inode from iget\n");
goto out;
}
int
nfs_notify_change(struct dentry *dentry, struct iattr *attr)
{
struct inode *inode = dentry->d_inode;
int error;
struct nfs_sattr sattr;
struct nfs_fattr fattr;
/*
* Make sure the inode is up-to-date.
*/
error = nfs_revalidate(dentry);
if (error) {
#ifdef NFS_PARANOIA
printk("nfs_notify_change: revalidate failed, error=%d\n", error);
#endif
goto out;
}
sattr.mode = (u32) -1;
if (attr->ia_valid & ATTR_MODE)
sattr.mode = attr->ia_mode;
sattr.uid = (u32) -1;
if (attr->ia_valid & ATTR_UID)
sattr.uid = attr->ia_uid;
sattr.gid = (u32) -1;
if (attr->ia_valid & ATTR_GID)
sattr.gid = attr->ia_gid;
sattr.size = (u32) -1;
if ((attr->ia_valid & ATTR_SIZE) && S_ISREG(inode->i_mode))
sattr.size = attr->ia_size;
sattr.mtime.seconds = sattr.mtime.useconds = (u32) -1;
if (attr->ia_valid & ATTR_MTIME) {
sattr.mtime.seconds = attr->ia_mtime;
sattr.mtime.useconds = 0;
}
sattr.atime.seconds = sattr.atime.useconds = (u32) -1;
if (attr->ia_valid & ATTR_ATIME) {
sattr.atime.seconds = attr->ia_atime;
sattr.atime.useconds = 0;
}
error = nfs_proc_setattr(NFS_DSERVER(dentry), NFS_FH(dentry),
&sattr, &fattr);
if (error)
goto out;
/*
* If we changed the size or mtime, update the inode
* now to avoid invalidating the page cache.
*/
if (sattr.size != (u32) -1) {
if (sattr.size != fattr.size)
printk("nfs_notify_change: sattr=%d, fattr=%d??\n",
sattr.size, fattr.size);
nfs_truncate_dirty_pages(inode, sattr.size);
inode->i_size = sattr.size;
inode->i_mtime = fattr.mtime.seconds;
}
if (sattr.mtime.seconds != (u32) -1)
inode->i_mtime = fattr.mtime.seconds;
error = nfs_refresh_inode(inode, &fattr);
out:
return error;
}
/*
* Externally visible revalidation function
*/
int
nfs_revalidate(struct dentry *dentry)
{
return nfs_revalidate_inode(NFS_DSERVER(dentry), dentry);
}
/*
* 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 dentry *dentry)
{
struct inode *inode = dentry->d_inode;
int status = 0;
struct nfs_fattr fattr;
if (jiffies - NFS_READTIME(inode) < NFS_ATTRTIMEO(inode))
goto out;
dfprintk(PAGECACHE, "NFS: revalidating %s/%s, ino=%ld\n",
dentry->d_parent->d_name.name, dentry->d_name.name,
inode->i_ino);
status = nfs_proc_getattr(server, NFS_FH(dentry), &fattr);
if (status) {
#ifdef NFS_PARANOIA
printk("nfs_revalidate_inode: %s/%s getattr failed, ino=%ld, error=%d\n",
dentry->d_parent->d_name.name, dentry->d_name.name, inode->i_ino, status);
#endif
goto out;
}
status = nfs_refresh_inode(inode, &fattr);
if (status) {
#ifdef NFS_PARANOIA
printk("nfs_revalidate_inode: %s/%s refresh failed, ino=%ld, error=%d\n",
dentry->d_parent->d_name.name, dentry->d_name.name, inode->i_ino, status);
#endif
goto out;
}
if (fattr.mtime.seconds == NFS_OLDMTIME(inode)) {
/* Update attrtimeo value */
if ((NFS_ATTRTIMEO(inode) <<= 1) > NFS_MAXATTRTIMEO(inode))
NFS_ATTRTIMEO(inode) = NFS_MAXATTRTIMEO(inode);
}
NFS_OLDMTIME(inode) = fattr.mtime.seconds;
dfprintk(PAGECACHE, "NFS: %s/%s revalidation complete\n",
dentry->d_parent->d_name.name, dentry->d_name.name);
out:
return status;
}
/*
* 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)
{
int invalid = 0;
int error = -EIO;
dfprintk(VFS, "NFS: refresh_inode(%x/%ld ct=%d)\n",
inode->i_dev, inode->i_ino, inode->i_count);
if (!inode || !fattr) {
printk("nfs_refresh_inode: inode or fattr is NULL\n");
goto out;
}
if (inode->i_ino != fattr->fileid) {
printk("nfs_refresh_inode: mismatch, ino=%ld, fattr=%d\n",
inode->i_ino, fattr->fileid);
goto out;
}
/*
* Make sure the inode's type hasn't changed.
*/
if ((inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
goto out_changed;
/*
* If the size or mtime changed from outside, we want
* to invalidate the local caches immediately.
*/
if (inode->i_size != fattr->size) {
#ifdef NFS_DEBUG_VERBOSE
printk("NFS: size change on %x/%ld\n", inode->i_dev, inode->i_ino);
#endif
invalid = 1;
}
if (inode->i_mtime != fattr->mtime.seconds) {
#ifdef NFS_DEBUG_VERBOSE
printk("NFS: mtime change on %x/%ld\n", inode->i_dev, inode->i_ino);
#endif
invalid = 1;
}
inode->i_mode = fattr->mode;
inode->i_nlink = fattr->nlink;
inode->i_uid = fattr->uid;
inode->i_gid = fattr->gid;
inode->i_size = fattr->size;
inode->i_blocks = fattr->blocks;
inode->i_atime = fattr->atime.seconds;
inode->i_mtime = fattr->mtime.seconds;
inode->i_ctime = fattr->ctime.seconds;
/*
* Update the read time so we don't revalidate too often.
*/
NFS_READTIME(inode) = jiffies;
error = 0;
if (invalid)
goto out_invalid;
out:
return error;
out_changed:
/*
* Big trouble! The inode has become a different object.
*/
#ifdef NFS_PARANOIA
printk("nfs_refresh_inode: inode %ld mode changed, %07o to %07o\n",
inode->i_ino, inode->i_mode, fattr->mode);
#endif
fattr->mode = inode->i_mode; /* save mode */
make_bad_inode(inode);
inode->i_mode = fattr->mode; /* restore mode */
/*
* 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.)
*/
out_invalid:
/*
* Invalidate the local caches
*/
#ifdef NFS_DEBUG_VERBOSE
printk("nfs_refresh_inode: invalidating %ld pages\n", inode->i_nrpages);
#endif
if (!S_ISDIR(inode->i_mode)) {
/* This sends off all dirty pages off to the server.
* Note that this function must not sleep. */
nfs_invalidate_pages(inode);
invalidate_inode_pages(inode);
} else
nfs_invalidate_dircache(inode);
NFS_CACHEINV(inode);
NFS_ATTRTIMEO(inode) = NFS_MINATTRTIMEO(inode);
goto out;
}
/*
* File system information
*/
static struct file_system_type nfs_fs_type = {
"nfs",
0 /* FS_NO_DCACHE - this doesn't work right now*/,
nfs_read_super,
NULL
};
/*
* Initialize NFS
*/
int
init_nfs_fs(void)
{
#ifdef CONFIG_PROC_FS
rpc_register_sysctl();
rpc_proc_init();
rpc_proc_register(&nfs_rpcstat);
#endif
return register_filesystem(&nfs_fs_type);
}
/*
* Every kernel module contains stuff like this.
*/
#ifdef MODULE
EXPORT_NO_SYMBOLS;
/* Not quite true; I just maintain it */
MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
int
init_module(void)
{
return init_nfs_fs();
}
void
cleanup_module(void)
{
#ifdef CONFIG_PROC_FS
rpc_proc_unregister("nfs");
#endif
unregister_filesystem(&nfs_fs_type);
nfs_free_dircache();
}
#endif
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