From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sat, 16 Apr 2005 15:20:36 -0700 Subject: Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! --- fs/nfsd/nfsproc.c | 605 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 605 insertions(+) create mode 100644 fs/nfsd/nfsproc.c (limited to 'fs/nfsd/nfsproc.c') diff --git a/fs/nfsd/nfsproc.c b/fs/nfsd/nfsproc.c new file mode 100644 index 0000000..757f9d2 --- /dev/null +++ b/fs/nfsd/nfsproc.c @@ -0,0 +1,605 @@ +/* + * nfsproc2.c Process version 2 NFS requests. + * linux/fs/nfsd/nfs2proc.c + * + * Process version 2 NFS requests. + * + * Copyright (C) 1995-1997 Olaf Kirch + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include + +typedef struct svc_rqst svc_rqst; +typedef struct svc_buf svc_buf; + +#define NFSDDBG_FACILITY NFSDDBG_PROC + + +static int +nfsd_proc_null(struct svc_rqst *rqstp, void *argp, void *resp) +{ + return nfs_ok; +} + +/* + * Get a file's attributes + * N.B. After this call resp->fh needs an fh_put + */ +static int +nfsd_proc_getattr(struct svc_rqst *rqstp, struct nfsd_fhandle *argp, + struct nfsd_attrstat *resp) +{ + dprintk("nfsd: GETATTR %s\n", SVCFH_fmt(&argp->fh)); + + fh_copy(&resp->fh, &argp->fh); + return fh_verify(rqstp, &resp->fh, 0, MAY_NOP); +} + +/* + * Set a file's attributes + * N.B. After this call resp->fh needs an fh_put + */ +static int +nfsd_proc_setattr(struct svc_rqst *rqstp, struct nfsd_sattrargs *argp, + struct nfsd_attrstat *resp) +{ + dprintk("nfsd: SETATTR %s, valid=%x, size=%ld\n", + SVCFH_fmt(&argp->fh), + argp->attrs.ia_valid, (long) argp->attrs.ia_size); + + fh_copy(&resp->fh, &argp->fh); + return nfsd_setattr(rqstp, &resp->fh, &argp->attrs,0, (time_t)0); +} + +/* + * Look up a path name component + * Note: the dentry in the resp->fh may be negative if the file + * doesn't exist yet. + * N.B. After this call resp->fh needs an fh_put + */ +static int +nfsd_proc_lookup(struct svc_rqst *rqstp, struct nfsd_diropargs *argp, + struct nfsd_diropres *resp) +{ + int nfserr; + + dprintk("nfsd: LOOKUP %s %.*s\n", + SVCFH_fmt(&argp->fh), argp->len, argp->name); + + fh_init(&resp->fh, NFS_FHSIZE); + nfserr = nfsd_lookup(rqstp, &argp->fh, argp->name, argp->len, + &resp->fh); + + fh_put(&argp->fh); + return nfserr; +} + +/* + * Read a symlink. + */ +static int +nfsd_proc_readlink(struct svc_rqst *rqstp, struct nfsd_readlinkargs *argp, + struct nfsd_readlinkres *resp) +{ + int nfserr; + + dprintk("nfsd: READLINK %s\n", SVCFH_fmt(&argp->fh)); + + /* Read the symlink. */ + resp->len = NFS_MAXPATHLEN; + nfserr = nfsd_readlink(rqstp, &argp->fh, argp->buffer, &resp->len); + + fh_put(&argp->fh); + return nfserr; +} + +/* + * Read a portion of a file. + * N.B. After this call resp->fh needs an fh_put + */ +static int +nfsd_proc_read(struct svc_rqst *rqstp, struct nfsd_readargs *argp, + struct nfsd_readres *resp) +{ + int nfserr; + + dprintk("nfsd: READ %s %d bytes at %d\n", + SVCFH_fmt(&argp->fh), + argp->count, argp->offset); + + /* Obtain buffer pointer for payload. 19 is 1 word for + * status, 17 words for fattr, and 1 word for the byte count. + */ + + if (NFSSVC_MAXBLKSIZE < argp->count) { + printk(KERN_NOTICE + "oversized read request from %u.%u.%u.%u:%d (%d bytes)\n", + NIPQUAD(rqstp->rq_addr.sin_addr.s_addr), + ntohs(rqstp->rq_addr.sin_port), + argp->count); + argp->count = NFSSVC_MAXBLKSIZE; + } + svc_reserve(rqstp, (19<<2) + argp->count + 4); + + resp->count = argp->count; + nfserr = nfsd_read(rqstp, fh_copy(&resp->fh, &argp->fh), NULL, + argp->offset, + argp->vec, argp->vlen, + &resp->count); + + return nfserr; +} + +/* + * Write data to a file + * N.B. After this call resp->fh needs an fh_put + */ +static int +nfsd_proc_write(struct svc_rqst *rqstp, struct nfsd_writeargs *argp, + struct nfsd_attrstat *resp) +{ + int nfserr; + int stable = 1; + + dprintk("nfsd: WRITE %s %d bytes at %d\n", + SVCFH_fmt(&argp->fh), + argp->len, argp->offset); + + nfserr = nfsd_write(rqstp, fh_copy(&resp->fh, &argp->fh), NULL, + argp->offset, + argp->vec, argp->vlen, + argp->len, + &stable); + return nfserr; +} + +/* + * CREATE processing is complicated. The keyword here is `overloaded.' + * The parent directory is kept locked between the check for existence + * and the actual create() call in compliance with VFS protocols. + * N.B. After this call _both_ argp->fh and resp->fh need an fh_put + */ +static int +nfsd_proc_create(struct svc_rqst *rqstp, struct nfsd_createargs *argp, + struct nfsd_diropres *resp) +{ + svc_fh *dirfhp = &argp->fh; + svc_fh *newfhp = &resp->fh; + struct iattr *attr = &argp->attrs; + struct inode *inode; + struct dentry *dchild; + int nfserr, type, mode; + dev_t rdev = 0, wanted = new_decode_dev(attr->ia_size); + + dprintk("nfsd: CREATE %s %.*s\n", + SVCFH_fmt(dirfhp), argp->len, argp->name); + + /* First verify the parent file handle */ + nfserr = fh_verify(rqstp, dirfhp, S_IFDIR, MAY_EXEC); + if (nfserr) + goto done; /* must fh_put dirfhp even on error */ + + /* Check for MAY_WRITE in nfsd_create if necessary */ + + nfserr = nfserr_acces; + if (!argp->len) + goto done; + nfserr = nfserr_exist; + if (isdotent(argp->name, argp->len)) + goto done; + fh_lock(dirfhp); + dchild = lookup_one_len(argp->name, dirfhp->fh_dentry, argp->len); + if (IS_ERR(dchild)) { + nfserr = nfserrno(PTR_ERR(dchild)); + goto out_unlock; + } + fh_init(newfhp, NFS_FHSIZE); + nfserr = fh_compose(newfhp, dirfhp->fh_export, dchild, dirfhp); + if (!nfserr && !dchild->d_inode) + nfserr = nfserr_noent; + dput(dchild); + if (nfserr) { + if (nfserr != nfserr_noent) + goto out_unlock; + /* + * If the new file handle wasn't verified, we can't tell + * whether the file exists or not. Time to bail ... + */ + nfserr = nfserr_acces; + if (!newfhp->fh_dentry) { + printk(KERN_WARNING + "nfsd_proc_create: file handle not verified\n"); + goto out_unlock; + } + } + + inode = newfhp->fh_dentry->d_inode; + + /* Unfudge the mode bits */ + if (attr->ia_valid & ATTR_MODE) { + type = attr->ia_mode & S_IFMT; + mode = attr->ia_mode & ~S_IFMT; + if (!type) { + /* no type, so if target exists, assume same as that, + * else assume a file */ + if (inode) { + type = inode->i_mode & S_IFMT; + switch(type) { + case S_IFCHR: + case S_IFBLK: + /* reserve rdev for later checking */ + rdev = inode->i_rdev; + attr->ia_valid |= ATTR_SIZE; + + /* FALLTHROUGH */ + case S_IFIFO: + /* this is probably a permission check.. + * at least IRIX implements perm checking on + * echo thing > device-special-file-or-pipe + * by doing a CREATE with type==0 + */ + nfserr = nfsd_permission(newfhp->fh_export, + newfhp->fh_dentry, + MAY_WRITE|MAY_LOCAL_ACCESS); + if (nfserr && nfserr != nfserr_rofs) + goto out_unlock; + } + } else + type = S_IFREG; + } + } else if (inode) { + type = inode->i_mode & S_IFMT; + mode = inode->i_mode & ~S_IFMT; + } else { + type = S_IFREG; + mode = 0; /* ??? */ + } + + attr->ia_valid |= ATTR_MODE; + attr->ia_mode = mode; + + /* Special treatment for non-regular files according to the + * gospel of sun micro + */ + if (type != S_IFREG) { + int is_borc = 0; + if (type != S_IFBLK && type != S_IFCHR) { + rdev = 0; + } else if (type == S_IFCHR && !(attr->ia_valid & ATTR_SIZE)) { + /* If you think you've seen the worst, grok this. */ + type = S_IFIFO; + } else { + /* Okay, char or block special */ + is_borc = 1; + if (!rdev) + rdev = wanted; + } + + /* we've used the SIZE information, so discard it */ + attr->ia_valid &= ~ATTR_SIZE; + + /* Make sure the type and device matches */ + nfserr = nfserr_exist; + if (inode && type != (inode->i_mode & S_IFMT)) + goto out_unlock; + } + + nfserr = 0; + if (!inode) { + /* File doesn't exist. Create it and set attrs */ + nfserr = nfsd_create(rqstp, dirfhp, argp->name, argp->len, + attr, type, rdev, newfhp); + } else if (type == S_IFREG) { + dprintk("nfsd: existing %s, valid=%x, size=%ld\n", + argp->name, attr->ia_valid, (long) attr->ia_size); + /* File already exists. We ignore all attributes except + * size, so that creat() behaves exactly like + * open(..., O_CREAT|O_TRUNC|O_WRONLY). + */ + attr->ia_valid &= ATTR_SIZE; + if (attr->ia_valid) + nfserr = nfsd_setattr(rqstp, newfhp, attr, 0, (time_t)0); + } + +out_unlock: + /* We don't really need to unlock, as fh_put does it. */ + fh_unlock(dirfhp); + +done: + fh_put(dirfhp); + return nfserr; +} + +static int +nfsd_proc_remove(struct svc_rqst *rqstp, struct nfsd_diropargs *argp, + void *resp) +{ + int nfserr; + + dprintk("nfsd: REMOVE %s %.*s\n", SVCFH_fmt(&argp->fh), + argp->len, argp->name); + + /* Unlink. -SIFDIR means file must not be a directory */ + nfserr = nfsd_unlink(rqstp, &argp->fh, -S_IFDIR, argp->name, argp->len); + fh_put(&argp->fh); + return nfserr; +} + +static int +nfsd_proc_rename(struct svc_rqst *rqstp, struct nfsd_renameargs *argp, + void *resp) +{ + int nfserr; + + dprintk("nfsd: RENAME %s %.*s -> \n", + SVCFH_fmt(&argp->ffh), argp->flen, argp->fname); + dprintk("nfsd: -> %s %.*s\n", + SVCFH_fmt(&argp->tfh), argp->tlen, argp->tname); + + nfserr = nfsd_rename(rqstp, &argp->ffh, argp->fname, argp->flen, + &argp->tfh, argp->tname, argp->tlen); + fh_put(&argp->ffh); + fh_put(&argp->tfh); + return nfserr; +} + +static int +nfsd_proc_link(struct svc_rqst *rqstp, struct nfsd_linkargs *argp, + void *resp) +{ + int nfserr; + + dprintk("nfsd: LINK %s ->\n", + SVCFH_fmt(&argp->ffh)); + dprintk("nfsd: %s %.*s\n", + SVCFH_fmt(&argp->tfh), + argp->tlen, + argp->tname); + + nfserr = nfsd_link(rqstp, &argp->tfh, argp->tname, argp->tlen, + &argp->ffh); + fh_put(&argp->ffh); + fh_put(&argp->tfh); + return nfserr; +} + +static int +nfsd_proc_symlink(struct svc_rqst *rqstp, struct nfsd_symlinkargs *argp, + void *resp) +{ + struct svc_fh newfh; + int nfserr; + + dprintk("nfsd: SYMLINK %s %.*s -> %.*s\n", + SVCFH_fmt(&argp->ffh), argp->flen, argp->fname, + argp->tlen, argp->tname); + + fh_init(&newfh, NFS_FHSIZE); + /* + * Create the link, look up new file and set attrs. + */ + nfserr = nfsd_symlink(rqstp, &argp->ffh, argp->fname, argp->flen, + argp->tname, argp->tlen, + &newfh, &argp->attrs); + + + fh_put(&argp->ffh); + fh_put(&newfh); + return nfserr; +} + +/* + * Make directory. This operation is not idempotent. + * N.B. After this call resp->fh needs an fh_put + */ +static int +nfsd_proc_mkdir(struct svc_rqst *rqstp, struct nfsd_createargs *argp, + struct nfsd_diropres *resp) +{ + int nfserr; + + dprintk("nfsd: MKDIR %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name); + + if (resp->fh.fh_dentry) { + printk(KERN_WARNING + "nfsd_proc_mkdir: response already verified??\n"); + } + + argp->attrs.ia_valid &= ~ATTR_SIZE; + fh_init(&resp->fh, NFS_FHSIZE); + nfserr = nfsd_create(rqstp, &argp->fh, argp->name, argp->len, + &argp->attrs, S_IFDIR, 0, &resp->fh); + fh_put(&argp->fh); + return nfserr; +} + +/* + * Remove a directory + */ +static int +nfsd_proc_rmdir(struct svc_rqst *rqstp, struct nfsd_diropargs *argp, + void *resp) +{ + int nfserr; + + dprintk("nfsd: RMDIR %s %.*s\n", SVCFH_fmt(&argp->fh), argp->len, argp->name); + + nfserr = nfsd_unlink(rqstp, &argp->fh, S_IFDIR, argp->name, argp->len); + fh_put(&argp->fh); + return nfserr; +} + +/* + * Read a portion of a directory. + */ +static int +nfsd_proc_readdir(struct svc_rqst *rqstp, struct nfsd_readdirargs *argp, + struct nfsd_readdirres *resp) +{ + int nfserr, count; + loff_t offset; + + dprintk("nfsd: READDIR %s %d bytes at %d\n", + SVCFH_fmt(&argp->fh), + argp->count, argp->cookie); + + /* Shrink to the client read size */ + count = (argp->count >> 2) - 2; + + /* Make sure we've room for the NULL ptr & eof flag */ + count -= 2; + if (count < 0) + count = 0; + + resp->buffer = argp->buffer; + resp->offset = NULL; + resp->buflen = count; + resp->common.err = nfs_ok; + /* Read directory and encode entries on the fly */ + offset = argp->cookie; + nfserr = nfsd_readdir(rqstp, &argp->fh, &offset, + &resp->common, nfssvc_encode_entry); + + resp->count = resp->buffer - argp->buffer; + if (resp->offset) + *resp->offset = htonl(offset); + + fh_put(&argp->fh); + return nfserr; +} + +/* + * Get file system info + */ +static int +nfsd_proc_statfs(struct svc_rqst * rqstp, struct nfsd_fhandle *argp, + struct nfsd_statfsres *resp) +{ + int nfserr; + + dprintk("nfsd: STATFS %s\n", SVCFH_fmt(&argp->fh)); + + nfserr = nfsd_statfs(rqstp, &argp->fh, &resp->stats); + fh_put(&argp->fh); + return nfserr; +} + +/* + * NFSv2 Server procedures. + * Only the results of non-idempotent operations are cached. + */ +#define nfsd_proc_none NULL +#define nfssvc_release_none NULL +struct nfsd_void { int dummy; }; + +#define PROC(name, argt, rest, relt, cache, respsize) \ + { (svc_procfunc) nfsd_proc_##name, \ + (kxdrproc_t) nfssvc_decode_##argt, \ + (kxdrproc_t) nfssvc_encode_##rest, \ + (kxdrproc_t) nfssvc_release_##relt, \ + sizeof(struct nfsd_##argt), \ + sizeof(struct nfsd_##rest), \ + 0, \ + cache, \ + respsize, \ + } + +#define ST 1 /* status */ +#define FH 8 /* filehandle */ +#define AT 18 /* attributes */ + +static struct svc_procedure nfsd_procedures2[18] = { + PROC(null, void, void, none, RC_NOCACHE, ST), + PROC(getattr, fhandle, attrstat, fhandle, RC_NOCACHE, ST+AT), + PROC(setattr, sattrargs, attrstat, fhandle, RC_REPLBUFF, ST+AT), + PROC(none, void, void, none, RC_NOCACHE, ST), + PROC(lookup, diropargs, diropres, fhandle, RC_NOCACHE, ST+FH+AT), + PROC(readlink, readlinkargs, readlinkres, none, RC_NOCACHE, ST+1+NFS_MAXPATHLEN/4), + PROC(read, readargs, readres, fhandle, RC_NOCACHE, ST+AT+1+NFSSVC_MAXBLKSIZE), + PROC(none, void, void, none, RC_NOCACHE, ST), + PROC(write, writeargs, attrstat, fhandle, RC_REPLBUFF, ST+AT), + PROC(create, createargs, diropres, fhandle, RC_REPLBUFF, ST+FH+AT), + PROC(remove, diropargs, void, none, RC_REPLSTAT, ST), + PROC(rename, renameargs, void, none, RC_REPLSTAT, ST), + PROC(link, linkargs, void, none, RC_REPLSTAT, ST), + PROC(symlink, symlinkargs, void, none, RC_REPLSTAT, ST), + PROC(mkdir, createargs, diropres, fhandle, RC_REPLBUFF, ST+FH+AT), + PROC(rmdir, diropargs, void, none, RC_REPLSTAT, ST), + PROC(readdir, readdirargs, readdirres, none, RC_NOCACHE, 0), + PROC(statfs, fhandle, statfsres, none, RC_NOCACHE, ST+5), +}; + + +struct svc_version nfsd_version2 = { + .vs_vers = 2, + .vs_nproc = 18, + .vs_proc = nfsd_procedures2, + .vs_dispatch = nfsd_dispatch, + .vs_xdrsize = NFS2_SVC_XDRSIZE, +}; + +/* + * Map errnos to NFS errnos. + */ +int +nfserrno (int errno) +{ + static struct { + int nfserr; + int syserr; + } nfs_errtbl[] = { + { nfs_ok, 0 }, + { nfserr_perm, -EPERM }, + { nfserr_noent, -ENOENT }, + { nfserr_io, -EIO }, + { nfserr_nxio, -ENXIO }, + { nfserr_acces, -EACCES }, + { nfserr_exist, -EEXIST }, + { nfserr_xdev, -EXDEV }, + { nfserr_mlink, -EMLINK }, + { nfserr_nodev, -ENODEV }, + { nfserr_notdir, -ENOTDIR }, + { nfserr_isdir, -EISDIR }, + { nfserr_inval, -EINVAL }, + { nfserr_fbig, -EFBIG }, + { nfserr_nospc, -ENOSPC }, + { nfserr_rofs, -EROFS }, + { nfserr_mlink, -EMLINK }, + { nfserr_nametoolong, -ENAMETOOLONG }, + { nfserr_notempty, -ENOTEMPTY }, +#ifdef EDQUOT + { nfserr_dquot, -EDQUOT }, +#endif + { nfserr_stale, -ESTALE }, + { nfserr_jukebox, -ETIMEDOUT }, + { nfserr_dropit, -EAGAIN }, + { nfserr_dropit, -ENOMEM }, + { nfserr_badname, -ESRCH }, + { nfserr_io, -ETXTBSY }, + { -1, -EIO } + }; + int i; + + for (i = 0; nfs_errtbl[i].nfserr != -1; i++) { + if (nfs_errtbl[i].syserr == errno) + return nfs_errtbl[i].nfserr; + } + printk (KERN_INFO "nfsd: non-standard errno: %d\n", errno); + return nfserr_io; +} + -- cgit v1.1