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- /*
- * linux/fs/nfs/proc.c
- *
- * Copyright (C) 1992, 1993, 1994 Rick Sladkey
- *
- * OS-independent nfs remote procedure call functions
- */
-
- /*
- * Defining NFS_PROC_DEBUG causes a lookup of a file named
- * "xyzzy" to toggle debugging. Just cd to an NFS-mounted
- * filesystem and type 'ls xyzzy' to turn on debugging.
- */
-
- #if 0
- #define NFS_PROC_DEBUG
- #endif
-
- #include <linux/config.h>
- #include <linux/param.h>
- #include <linux/sched.h>
- #include <linux/mm.h>
- #include <linux/nfs_fs.h>
- #include <linux/utsname.h>
- #include <linux/errno.h>
- #include <linux/string.h>
- #include <linux/in.h>
-
- #ifdef NFS_PROC_DEBUG
-
- static int proc_debug = 0;
- #define PRINTK(format, args...) \
- do { \
- if (proc_debug) \
- printk(format , ## args); \
- } while (0)
-
- #else /* !NFS_PROC_DEBUG */
-
- #define PRINTK(format, args...) do ; while (0)
-
- #endif /* !NFS_PROC_DEBUG */
-
- static int *nfs_rpc_header(int *p, int procedure, int ruid);
- static int *nfs_rpc_verify(int *p);
- static int nfs_stat_to_errno(int stat);
-
- /*
- * Our memory allocation and release functions.
- */
-
- static inline int *nfs_rpc_alloc(void)
- {
- return (int *) __get_free_page(GFP_KERNEL);
- }
-
- static inline void nfs_rpc_free(int *p)
- {
- free_page((long) p);
- }
-
- /*
- * Here are a bunch of xdr encode/decode functions that convert
- * between machine dependent and xdr data formats.
- */
-
- static inline int *xdr_encode_fhandle(int *p, struct nfs_fh *fhandle)
- {
- *((struct nfs_fh *) p) = *fhandle;
- p += (sizeof (*fhandle) + 3) >> 2;
- return p;
- }
-
- static inline int *xdr_decode_fhandle(int *p, struct nfs_fh *fhandle)
- {
- *fhandle = *((struct nfs_fh *) p);
- p += (sizeof (*fhandle) + 3) >> 2;
- return p;
- }
-
- static inline int *xdr_encode_string(int *p, const char *string)
- {
- int len, quadlen;
-
- len = strlen(string);
- quadlen = (len + 3) >> 2;
- *p++ = htonl(len);
- memcpy((char *) p, string, len);
- memset(((char *) p) + len, '\0', (quadlen << 2) - len);
- p += quadlen;
- return p;
- }
-
- static inline int *xdr_decode_string(int *p, char *string, int maxlen)
- {
- unsigned int len;
-
- len = ntohl(*p++);
- if (len > maxlen)
- return NULL;
- memcpy(string, (char *) p, len);
- string[len] = '\0';
- p += (len + 3) >> 2;
- return p;
- }
-
- static inline int *xdr_encode_data(int *p, char *data, int len)
- {
- int quadlen;
-
- quadlen = (len + 3) >> 2;
- *p++ = htonl(len);
- memcpy((char *) p, data, len);
- memset(((char *) p) + len, '\0', (quadlen << 2) - len);
- p += quadlen;
- return p;
- }
-
- static inline int *xdr_decode_data(int *p, char *data, int *lenp, int maxlen)
- {
- unsigned int len;
-
- len = *lenp = ntohl(*p++);
- if (len > maxlen)
- return NULL;
- memcpy(data, (char *) p, len);
- p += (len + 3) >> 2;
- return p;
- }
-
- static int *xdr_decode_fattr(int *p, struct nfs_fattr *fattr)
- {
- fattr->type = (enum nfs_ftype) ntohl(*p++);
- fattr->mode = ntohl(*p++);
- fattr->nlink = ntohl(*p++);
- fattr->uid = ntohl(*p++);
- fattr->gid = ntohl(*p++);
- fattr->size = ntohl(*p++);
- fattr->blocksize = ntohl(*p++);
- fattr->rdev = ntohl(*p++);
- fattr->blocks = ntohl(*p++);
- fattr->fsid = ntohl(*p++);
- fattr->fileid = ntohl(*p++);
- fattr->atime.seconds = ntohl(*p++);
- fattr->atime.useconds = ntohl(*p++);
- fattr->mtime.seconds = ntohl(*p++);
- fattr->mtime.useconds = ntohl(*p++);
- fattr->ctime.seconds = ntohl(*p++);
- fattr->ctime.useconds = ntohl(*p++);
- return p;
- }
-
- static int *xdr_encode_sattr(int *p, struct nfs_sattr *sattr)
- {
- *p++ = htonl(sattr->mode);
- *p++ = htonl(sattr->uid);
- *p++ = htonl(sattr->gid);
- *p++ = htonl(sattr->size);
- *p++ = htonl(sattr->atime.seconds);
- *p++ = htonl(sattr->atime.useconds);
- *p++ = htonl(sattr->mtime.seconds);
- *p++ = htonl(sattr->mtime.useconds);
- return p;
- }
-
- static int *xdr_decode_entry(int *p, struct nfs_entry *entry)
- {
- entry->fileid = ntohl(*p++);
- if (!(p = xdr_decode_string(p, entry->name, NFS_MAXNAMLEN)))
- return NULL;
- entry->cookie = ntohl(*p++);
- entry->eof = 0;
- return p;
- }
-
- static int *xdr_decode_fsinfo(int *p, struct nfs_fsinfo *res)
- {
- res->tsize = ntohl(*p++);
- res->bsize = ntohl(*p++);
- res->blocks = ntohl(*p++);
- res->bfree = ntohl(*p++);
- res->bavail = ntohl(*p++);
- return p;
- }
-
- /*
- * One function for each procedure in the NFS protocol.
- */
-
- int nfs_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
- struct nfs_fattr *fattr)
- {
- int *p, *p0;
- int status;
- int ruid = 0;
-
- PRINTK("NFS call getattr\n");
- if (!(p0 = nfs_rpc_alloc()))
- return -EIO;
- retry:
- p = nfs_rpc_header(p0, NFSPROC_GETATTR, ruid);
- p = xdr_encode_fhandle(p, fhandle);
- if ((status = nfs_rpc_call(server, p0, p)) < 0) {
- nfs_rpc_free(p0);
- return status;
- }
- if (!(p = nfs_rpc_verify(p0)))
- status = NFSERR_IO;
- else if ((status = ntohl(*p++)) == NFS_OK) {
- p = xdr_decode_fattr(p, fattr);
- PRINTK("NFS reply getattr\n");
- }
- else {
- if (!ruid && current->euid == 0 && current->uid != 0) {
- ruid = 1;
- goto retry;
- }
- PRINTK("NFS reply getattr failed = %d\n", status);
- }
- nfs_rpc_free(p0);
- return -nfs_stat_to_errno(status);
- }
-
- int nfs_proc_setattr(struct nfs_server *server, struct nfs_fh *fhandle,
- struct nfs_sattr *sattr, struct nfs_fattr *fattr)
- {
- int *p, *p0;
- int status;
- int ruid = 0;
-
- PRINTK("NFS call setattr\n");
- if (!(p0 = nfs_rpc_alloc()))
- return -EIO;
- retry:
- p = nfs_rpc_header(p0, NFSPROC_SETATTR, ruid);
- p = xdr_encode_fhandle(p, fhandle);
- p = xdr_encode_sattr(p, sattr);
- if ((status = nfs_rpc_call(server, p0, p)) < 0) {
- nfs_rpc_free(p0);
- return status;
- }
- if (!(p = nfs_rpc_verify(p0)))
- status = NFSERR_IO;
- else if ((status = ntohl(*p++)) == NFS_OK) {
- p = xdr_decode_fattr(p, fattr);
- PRINTK("NFS reply setattr\n");
- }
- else {
- if (!ruid && current->euid == 0 && current->uid != 0) {
- ruid = 1;
- goto retry;
- }
- PRINTK("NFS reply setattr failed = %d\n", status);
- }
- nfs_rpc_free(p0);
- return -nfs_stat_to_errno(status);
- }
-
- int nfs_proc_lookup(struct nfs_server *server, struct nfs_fh *dir, const char *name,
- struct nfs_fh *fhandle, struct nfs_fattr *fattr)
- {
- int *p, *p0;
- int status;
- int ruid = 0;
-
- PRINTK("NFS call lookup %s\n", name);
- #ifdef NFS_PROC_DEBUG
- if (!strcmp(name, "xyzzy"))
- proc_debug = 1 - proc_debug;
- #endif
- if (!(p0 = nfs_rpc_alloc()))
- return -EIO;
- retry:
- p = nfs_rpc_header(p0, NFSPROC_LOOKUP, ruid);
- p = xdr_encode_fhandle(p, dir);
- p = xdr_encode_string(p, name);
- if ((status = nfs_rpc_call(server, p0, p)) < 0) {
- nfs_rpc_free(p0);
- return status;
- }
- if (!(p = nfs_rpc_verify(p0)))
- status = NFSERR_IO;
- else if ((status = ntohl(*p++)) == NFS_OK) {
- p = xdr_decode_fhandle(p, fhandle);
- p = xdr_decode_fattr(p, fattr);
- PRINTK("NFS reply lookup\n");
- }
- else {
- if (!ruid && current->euid == 0 && current->uid != 0) {
- ruid = 1;
- goto retry;
- }
- PRINTK("NFS reply lookup failed = %d\n", status);
- }
- nfs_rpc_free(p0);
- return -nfs_stat_to_errno(status);
- }
-
- int nfs_proc_readlink(struct nfs_server *server, struct nfs_fh *fhandle,
- char *res)
- {
- int *p, *p0;
- int status;
- int ruid = 0;
-
- PRINTK("NFS call readlink\n");
- if (!(p0 = nfs_rpc_alloc()))
- return -EIO;
- retry:
- p = nfs_rpc_header(p0, NFSPROC_READLINK, ruid);
- p = xdr_encode_fhandle(p, fhandle);
- if ((status = nfs_rpc_call(server, p0, p)) < 0) {
- nfs_rpc_free(p0);
- return status;
- }
- if (!(p = nfs_rpc_verify(p0)))
- status = NFSERR_IO;
- else if ((status = ntohl(*p++)) == NFS_OK) {
- if (!(p = xdr_decode_string(p, res, NFS_MAXPATHLEN))) {
- printk("nfs_proc_readlink: giant pathname\n");
- status = NFSERR_IO;
- }
- else
- PRINTK("NFS reply readlink %s\n", res);
- }
- else {
- if (!ruid && current->euid == 0 && current->uid != 0) {
- ruid = 1;
- goto retry;
- }
- PRINTK("NFS reply readlink failed = %d\n", status);
- }
- nfs_rpc_free(p0);
- return -nfs_stat_to_errno(status);
- }
-
- int nfs_proc_read(struct nfs_server *server, struct nfs_fh *fhandle,
- int offset, int count, char *data, struct nfs_fattr *fattr)
- {
- int *p, *p0;
- int status;
- int ruid = 0;
- int len = 0; /* = 0 is for gcc */
-
- PRINTK("NFS call read %d @ %d\n", count, offset);
- if (!(p0 = nfs_rpc_alloc()))
- return -EIO;
- retry:
- p = nfs_rpc_header(p0, NFSPROC_READ, ruid);
- p = xdr_encode_fhandle(p, fhandle);
- *p++ = htonl(offset);
- *p++ = htonl(count);
- *p++ = htonl(count); /* traditional, could be any value */
- if ((status = nfs_rpc_call(server, p0, p)) < 0) {
- nfs_rpc_free(p0);
- return status;
- }
- if (!(p = nfs_rpc_verify(p0)))
- status = NFSERR_IO;
- else if ((status = ntohl(*p++)) == NFS_OK) {
- p = xdr_decode_fattr(p, fattr);
- if (!(p = xdr_decode_data(p, data, &len, count))) {
- printk("nfs_proc_read: giant data size\n");
- status = NFSERR_IO;
- }
- else
- PRINTK("NFS reply read %d\n", len);
- }
- else {
- if (!ruid && current->euid == 0 && current->uid != 0) {
- ruid = 1;
- goto retry;
- }
- PRINTK("NFS reply read failed = %d\n", status);
- }
- nfs_rpc_free(p0);
- return (status == NFS_OK) ? len : -nfs_stat_to_errno(status);
- }
-
- int nfs_proc_write(struct nfs_server *server, struct nfs_fh *fhandle,
- int offset, int count, char *data, struct nfs_fattr *fattr)
- {
- int *p, *p0;
- int status;
- int ruid = 0;
-
- PRINTK("NFS call write %d @ %d\n", count, offset);
- if (!(p0 = nfs_rpc_alloc()))
- return -EIO;
- retry:
- p = nfs_rpc_header(p0, NFSPROC_WRITE, ruid);
- p = xdr_encode_fhandle(p, fhandle);
- *p++ = htonl(offset); /* traditional, could be any value */
- *p++ = htonl(offset);
- *p++ = htonl(count); /* traditional, could be any value */
- p = xdr_encode_data(p, data, count);
- if ((status = nfs_rpc_call(server, p0, p)) < 0) {
- nfs_rpc_free(p0);
- return status;
- }
- if (!(p = nfs_rpc_verify(p0)))
- status = NFSERR_IO;
- else if ((status = ntohl(*p++)) == NFS_OK) {
- p = xdr_decode_fattr(p, fattr);
- PRINTK("NFS reply write\n");
- }
- else {
- if (!ruid && current->euid == 0 && current->uid != 0) {
- ruid = 1;
- goto retry;
- }
- PRINTK("NFS reply write failed = %d\n", status);
- }
- nfs_rpc_free(p0);
- return -nfs_stat_to_errno(status);
- }
-
- int nfs_proc_create(struct nfs_server *server, struct nfs_fh *dir,
- const char *name, struct nfs_sattr *sattr,
- struct nfs_fh *fhandle, struct nfs_fattr *fattr)
- {
- int *p, *p0;
- int status;
- int ruid = 0;
-
- PRINTK("NFS call create %s\n", name);
- if (!(p0 = nfs_rpc_alloc()))
- return -EIO;
- retry:
- p = nfs_rpc_header(p0, NFSPROC_CREATE, ruid);
- p = xdr_encode_fhandle(p, dir);
- p = xdr_encode_string(p, name);
- p = xdr_encode_sattr(p, sattr);
- if ((status = nfs_rpc_call(server, p0, p)) < 0) {
- nfs_rpc_free(p0);
- return status;
- }
- if (!(p = nfs_rpc_verify(p0)))
- status = NFSERR_IO;
- else if ((status = ntohl(*p++)) == NFS_OK) {
- p = xdr_decode_fhandle(p, fhandle);
- p = xdr_decode_fattr(p, fattr);
- PRINTK("NFS reply create\n");
- }
- else {
- if (!ruid && current->euid == 0 && current->uid != 0) {
- ruid = 1;
- goto retry;
- }
- PRINTK("NFS reply create failed = %d\n", status);
- }
- nfs_rpc_free(p0);
- return -nfs_stat_to_errno(status);
- }
-
- int nfs_proc_remove(struct nfs_server *server, struct nfs_fh *dir, const char *name)
- {
- int *p, *p0;
- int status;
- int ruid = 0;
-
- PRINTK("NFS call remove %s\n", name);
- if (!(p0 = nfs_rpc_alloc()))
- return -EIO;
- retry:
- p = nfs_rpc_header(p0, NFSPROC_REMOVE, ruid);
- p = xdr_encode_fhandle(p, dir);
- p = xdr_encode_string(p, name);
- if ((status = nfs_rpc_call(server, p0, p)) < 0) {
- nfs_rpc_free(p0);
- return status;
- }
- if (!(p = nfs_rpc_verify(p0)))
- status = NFSERR_IO;
- else if ((status = ntohl(*p++)) == NFS_OK) {
- PRINTK("NFS reply remove\n");
- }
- else {
- if (!ruid && current->euid == 0 && current->uid != 0) {
- ruid = 1;
- goto retry;
- }
- PRINTK("NFS reply remove failed = %d\n", status);
- }
- nfs_rpc_free(p0);
- return -nfs_stat_to_errno(status);
- }
-
- int nfs_proc_rename(struct nfs_server *server,
- struct nfs_fh *old_dir, const char *old_name,
- struct nfs_fh *new_dir, const char *new_name)
- {
- int *p, *p0;
- int status;
- int ruid = 0;
-
- PRINTK("NFS call rename %s -> %s\n", old_name, new_name);
- if (!(p0 = nfs_rpc_alloc()))
- return -EIO;
- retry:
- p = nfs_rpc_header(p0, NFSPROC_RENAME, ruid);
- p = xdr_encode_fhandle(p, old_dir);
- p = xdr_encode_string(p, old_name);
- p = xdr_encode_fhandle(p, new_dir);
- p = xdr_encode_string(p, new_name);
- if ((status = nfs_rpc_call(server, p0, p)) < 0) {
- nfs_rpc_free(p0);
- return status;
- }
- if (!(p = nfs_rpc_verify(p0)))
- status = NFSERR_IO;
- else if ((status = ntohl(*p++)) == NFS_OK) {
- PRINTK("NFS reply rename\n");
- }
- else {
- if (!ruid && current->euid == 0 && current->uid != 0) {
- ruid = 1;
- goto retry;
- }
- PRINTK("NFS reply rename failed = %d\n", status);
- }
- nfs_rpc_free(p0);
- return -nfs_stat_to_errno(status);
- }
-
- int nfs_proc_link(struct nfs_server *server, struct nfs_fh *fhandle,
- struct nfs_fh *dir, const char *name)
- {
- int *p, *p0;
- int status;
- int ruid = 0;
-
- PRINTK("NFS call link %s\n", name);
- if (!(p0 = nfs_rpc_alloc()))
- return -EIO;
- retry:
- p = nfs_rpc_header(p0, NFSPROC_LINK, ruid);
- p = xdr_encode_fhandle(p, fhandle);
- p = xdr_encode_fhandle(p, dir);
- p = xdr_encode_string(p, name);
- if ((status = nfs_rpc_call(server, p0, p)) < 0) {
- nfs_rpc_free(p0);
- return status;
- }
- if (!(p = nfs_rpc_verify(p0)))
- status = NFSERR_IO;
- else if ((status = ntohl(*p++)) == NFS_OK) {
- PRINTK("NFS reply link\n");
- }
- else {
- if (!ruid && current->euid == 0 && current->uid != 0) {
- ruid = 1;
- goto retry;
- }
- PRINTK("NFS reply link failed = %d\n", status);
- }
- nfs_rpc_free(p0);
- return -nfs_stat_to_errno(status);
- }
-
- int nfs_proc_symlink(struct nfs_server *server, struct nfs_fh *dir,
- const char *name, const char *path, struct nfs_sattr *sattr)
- {
- int *p, *p0;
- int status;
- int ruid = 0;
-
- PRINTK("NFS call symlink %s -> %s\n", name, path);
- if (!(p0 = nfs_rpc_alloc()))
- return -EIO;
- retry:
- p = nfs_rpc_header(p0, NFSPROC_SYMLINK, ruid);
- p = xdr_encode_fhandle(p, dir);
- p = xdr_encode_string(p, name);
- p = xdr_encode_string(p, path);
- p = xdr_encode_sattr(p, sattr);
- if ((status = nfs_rpc_call(server, p0, p)) < 0) {
- nfs_rpc_free(p0);
- return status;
- }
- if (!(p = nfs_rpc_verify(p0)))
- status = NFSERR_IO;
- else if ((status = ntohl(*p++)) == NFS_OK) {
- PRINTK("NFS reply symlink\n");
- }
- else {
- if (!ruid && current->euid == 0 && current->uid != 0) {
- ruid = 1;
- goto retry;
- }
- PRINTK("NFS reply symlink failed = %d\n", status);
- }
- nfs_rpc_free(p0);
- return -nfs_stat_to_errno(status);
- }
-
- int nfs_proc_mkdir(struct nfs_server *server, struct nfs_fh *dir,
- const char *name, struct nfs_sattr *sattr,
- struct nfs_fh *fhandle, struct nfs_fattr *fattr)
- {
- int *p, *p0;
- int status;
- int ruid = 0;
-
- PRINTK("NFS call mkdir %s\n", name);
- if (!(p0 = nfs_rpc_alloc()))
- return -EIO;
- retry:
- p = nfs_rpc_header(p0, NFSPROC_MKDIR, ruid);
- p = xdr_encode_fhandle(p, dir);
- p = xdr_encode_string(p, name);
- p = xdr_encode_sattr(p, sattr);
- if ((status = nfs_rpc_call(server, p0, p)) < 0) {
- nfs_rpc_free(p0);
- return status;
- }
- if (!(p = nfs_rpc_verify(p0)))
- status = NFSERR_IO;
- else if ((status = ntohl(*p++)) == NFS_OK) {
- p = xdr_decode_fhandle(p, fhandle);
- p = xdr_decode_fattr(p, fattr);
- PRINTK("NFS reply mkdir\n");
- }
- else {
- if (!ruid && current->euid == 0 && current->uid != 0) {
- ruid = 1;
- goto retry;
- }
- PRINTK("NFS reply mkdir failed = %d\n", status);
- }
- nfs_rpc_free(p0);
- return -nfs_stat_to_errno(status);
- }
-
- int nfs_proc_rmdir(struct nfs_server *server, struct nfs_fh *dir, const char *name)
- {
- int *p, *p0;
- int status;
- int ruid = 0;
-
- PRINTK("NFS call rmdir %s\n", name);
- if (!(p0 = nfs_rpc_alloc()))
- return -EIO;
- retry:
- p = nfs_rpc_header(p0, NFSPROC_RMDIR, ruid);
- p = xdr_encode_fhandle(p, dir);
- p = xdr_encode_string(p, name);
- if ((status = nfs_rpc_call(server, p0, p)) < 0) {
- nfs_rpc_free(p0);
- return status;
- }
- if (!(p = nfs_rpc_verify(p0)))
- status = NFSERR_IO;
- else if ((status = ntohl(*p++)) == NFS_OK) {
- PRINTK("NFS reply rmdir\n");
- }
- else {
- if (!ruid && current->euid == 0 && current->uid != 0) {
- ruid = 1;
- goto retry;
- }
- PRINTK("NFS reply rmdir failed = %d\n", status);
- }
- nfs_rpc_free(p0);
- return -nfs_stat_to_errno(status);
- }
-
- int nfs_proc_readdir(struct nfs_server *server, struct nfs_fh *fhandle,
- int cookie, int count, struct nfs_entry *entry)
- {
- int *p, *p0;
- int status;
- int ruid = 0;
- int i = 0; /* = 0 is for gcc */
- int size;
- int eof;
-
- PRINTK("NFS call readdir %d @ %d\n", count, cookie);
- size = server->rsize;
- if (!(p0 = nfs_rpc_alloc()))
- return -EIO;
- retry:
- p = nfs_rpc_header(p0, NFSPROC_READDIR, ruid);
- p = xdr_encode_fhandle(p, fhandle);
- *p++ = htonl(cookie);
- *p++ = htonl(size);
- if ((status = nfs_rpc_call(server, p0, p)) < 0) {
- nfs_rpc_free(p0);
- return status;
- }
- if (!(p = nfs_rpc_verify(p0)))
- status = NFSERR_IO;
- else if ((status = ntohl(*p++)) == NFS_OK) {
- for (i = 0; i < count && *p++; i++) {
- if (!(p = xdr_decode_entry(p, entry++)))
- break;
- }
- if (!p) {
- printk("nfs_proc_readdir: giant filename\n");
- status = NFSERR_IO;
- }
- else {
- eof = (i == count && !*p++ && *p++)
- || (i < count && *p++);
- if (eof && i)
- entry[-1].eof = 1;
- PRINTK("NFS reply readdir %d %s\n", i,
- eof ? "eof" : "");
- }
- }
- else {
- if (!ruid && current->euid == 0 && current->uid != 0) {
- ruid = 1;
- goto retry;
- }
- PRINTK("NFS reply readdir failed = %d\n", status);
- }
- nfs_rpc_free(p0);
- return (status == NFS_OK) ? i : -nfs_stat_to_errno(status);
- }
-
- int nfs_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
- struct nfs_fsinfo *res)
- {
- int *p, *p0;
- int status;
- int ruid = 0;
-
- PRINTK("NFS call statfs\n");
- if (!(p0 = nfs_rpc_alloc()))
- return -EIO;
- retry:
- p = nfs_rpc_header(p0, NFSPROC_STATFS, ruid);
- p = xdr_encode_fhandle(p, fhandle);
- if ((status = nfs_rpc_call(server, p0, p)) < 0) {
- nfs_rpc_free(p0);
- return status;
- }
- if (!(p = nfs_rpc_verify(p0)))
- status = NFSERR_IO;
- else if ((status = ntohl(*p++)) == NFS_OK) {
- p = xdr_decode_fsinfo(p, res);
- PRINTK("NFS reply statfs\n");
- }
- else {
- if (!ruid && current->euid == 0 && current->uid != 0) {
- ruid = 1;
- goto retry;
- }
- PRINTK("NFS reply statfs failed = %d\n", status);
- }
- nfs_rpc_free(p0);
- return -nfs_stat_to_errno(status);
- }
-
- /*
- * Here are a few RPC-assist functions.
- */
-
- static int *nfs_rpc_header(int *p, int procedure, int ruid)
- {
- int *p1, *p2;
- int i;
- static int xid = 0;
- unsigned char *sys = (unsigned char *) system_utsname.nodename;
-
- if (xid == 0) {
- xid = CURRENT_TIME;
- xid ^= (sys[3]<<24) | (sys[2]<<16) | (sys[1]<<8) | sys[0];
- }
- *p++ = htonl(++xid);
- *p++ = htonl(RPC_CALL);
- *p++ = htonl(RPC_VERSION);
- *p++ = htonl(NFS_PROGRAM);
- *p++ = htonl(NFS_VERSION);
- *p++ = htonl(procedure);
- *p++ = htonl(RPC_AUTH_UNIX);
- p1 = p++;
- *p++ = htonl(CURRENT_TIME); /* traditional, could be anything */
- p = xdr_encode_string(p, (char *) sys);
- *p++ = htonl(ruid ? current->uid : current->euid);
- *p++ = htonl(current->egid);
- p2 = p++;
- for (i = 0; i < 16 && i < NGROUPS && current->groups[i] != NOGROUP; i++)
- *p++ = htonl(current->groups[i]);
- *p2 = htonl(i);
- *p1 = htonl((p - (p1 + 1)) << 2);
- *p++ = htonl(RPC_AUTH_NULL);
- *p++ = htonl(0);
- return p;
- }
-
- static int *nfs_rpc_verify(int *p)
- {
- unsigned int n;
-
- p++;
- if ((n = ntohl(*p++)) != RPC_REPLY) {
- printk("nfs_rpc_verify: not an RPC reply: %d\n", n);
- return NULL;
- }
- if ((n = ntohl(*p++)) != RPC_MSG_ACCEPTED) {
- printk("nfs_rpc_verify: RPC call rejected: %d\n", n);
- return NULL;
- }
- switch (n = ntohl(*p++)) {
- case RPC_AUTH_NULL: case RPC_AUTH_UNIX: case RPC_AUTH_SHORT:
- break;
- default:
- printk("nfs_rpc_verify: bad RPC authentication type: %d\n", n);
- return NULL;
- }
- if ((n = ntohl(*p++)) > 400) {
- printk("nfs_rpc_verify: giant auth size\n");
- return NULL;
- }
- p += (n + 3) >> 2;
- if ((n = ntohl(*p++)) != RPC_SUCCESS) {
- printk("nfs_rpc_verify: RPC call failed: %d\n", n);
- return NULL;
- }
- return p;
- }
-
- /*
- * We need to translate between nfs status return values and
- * the local errno values which may not be the same.
- */
-
- #ifndef EDQUOT
- #define EDQUOT ENOSPC
- #endif
-
- static struct {
- int stat;
- int errno;
- } nfs_errtbl[] = {
- { NFS_OK, 0 },
- { NFSERR_PERM, EPERM },
- { NFSERR_NOENT, ENOENT },
- { NFSERR_IO, EIO },
- { NFSERR_NXIO, ENXIO },
- { NFSERR_ACCES, EACCES },
- { NFSERR_EXIST, EEXIST },
- { NFSERR_NODEV, ENODEV },
- { NFSERR_NOTDIR, ENOTDIR },
- { NFSERR_ISDIR, EISDIR },
- { NFSERR_INVAL, EINVAL },
- { NFSERR_FBIG, EFBIG },
- { NFSERR_NOSPC, ENOSPC },
- { NFSERR_ROFS, EROFS },
- { NFSERR_NAMETOOLONG, ENAMETOOLONG },
- { NFSERR_NOTEMPTY, ENOTEMPTY },
- { NFSERR_DQUOT, EDQUOT },
- { NFSERR_STALE, ESTALE },
- #ifdef EWFLUSH
- { NFSERR_WFLUSH, EWFLUSH },
- #endif
- { -1, EIO }
- };
-
- static int nfs_stat_to_errno(int stat)
- {
- int i;
-
- for (i = 0; nfs_errtbl[i].stat != -1; i++) {
- if (nfs_errtbl[i].stat == stat)
- return nfs_errtbl[i].errno;
- }
- printk("nfs_stat_to_errno: bad nfs status return value: %d\n", stat);
- return nfs_errtbl[i].errno;
- }
-
-