patch-2.2.18 linux/fs/nfs/proc.c

• Lines: 562
• Date: Fri Sep 15 22:10:44 2000
• Orig file: v2.2.17/fs/nfs/proc.c
• Orig date: Fri Apr 21 12:46:44 2000

diff -u --new-file --recursive --exclude-from /usr/src/exclude v2.2.17/fs/nfs/proc.c linux/fs/nfs/proc.c
@@ -13,10 +13,6 @@
  *  Note: Error returns are optimized for NFS_OK, which isn't translated via
  *  nfs_stat_to_errno(), but happens to be already the right return code.
  *
- *  FixMe: We ought to define a sensible small max size for
- *  things like getattr that are tiny packets and use the
- *  old get_free_page stuff with it.
- *
  *  Also, the code currently doesn't check the size of the packet, when
  *  it decodes the packet.
  *
@@ -25,211 +21,342 @@
  *  Completely rewritten to support the new RPC call interface;
  *  rewrote and moved the entire XDR stuff to xdr.c
  *  --Olaf Kirch June 1996
+ *
+ *  The code below initializes all auto variables explicitly, otherwise
+ *  it will fail to work as a module (gcc generates a memset call for an
+ *  incomplete struct).
  */
 
-#define NFS_NEED_XDR_TYPES
+#define NFS_NEED_NFS2_XDR_TYPES
 
+#include <linux/types.h>
 #include <linux/param.h>
+#include <linux/malloc.h>
 #include <linux/sched.h>
 #include <linux/mm.h>
-#include <linux/malloc.h>
 #include <linux/utsname.h>
 #include <linux/errno.h>
 #include <linux/string.h>
 #include <linux/in.h>
 #include <linux/pagemap.h>
 #include <linux/sunrpc/clnt.h>
+#include <linux/nfs.h>
+#include <linux/nfs2.h>
 #include <linux/nfs_fs.h>
 
 #include <asm/segment.h>
 
-#ifdef NFS_DEBUG
-# define NFSDBG_FACILITY	NFSDBG_PROC
-#endif
 
 
 /*
+ * Typing short-hands
+ */
+typedef struct nfs_fattr	fattr;
+typedef struct qstr		qstr;
+
+#define NFSDBG_FACILITY		NFSDBG_PROC
+
+
+/*
+ * Bare-bones access to getattr: this is for nfs_read_super.
+ */
+static int
+nfs_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
+			fattr *fattr)
+{
+	int		status;
+
+	dprintk("NFS call  getroot\n");
+	fattr->valid = 0;
+	status = rpc_call(server->client, NFSPROC_GETATTR, fhandle, fattr, 0);
+	dprintk("NFS reply getroot\n");
+	return status;
+}
+
+/*
  * 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)
+static int
+nfs_proc_getattr(struct dentry *dentry, fattr *fattr)
 {
 	int	status;
 
 	dprintk("NFS call  getattr\n");
-	status = rpc_call(server->client, NFSPROC_GETATTR, fhandle, fattr, 0);
+	fattr->valid = 0;
+	status = rpc_call(NFS_CLIENT(dentry->d_inode), NFSPROC_GETATTR,
+				NFS_FH(dentry), fattr, 0);
 	dprintk("NFS reply getattr\n");
 	return status;
 }
 
-int
-nfs_proc_setattr(struct nfs_server *server, struct nfs_fh *fhandle,
-			struct nfs_sattr *sattr, struct nfs_fattr *fattr)
+static int
+nfs_proc_setattr(struct dentry *dentry, fattr *fattr,
+				struct iattr *sattr)
 {
-	struct nfs_sattrargs	arg = { fhandle, sattr };
+	struct nfs_sattrargs	arg = { NFS_FH(dentry), sattr };
 	int	status;
 
 	dprintk("NFS call  setattr\n");
-	status = rpc_call(server->client, NFSPROC_SETATTR, &arg, fattr, 0);
+	fattr->valid = 0;
+	status = rpc_call(NFS_CLIENT(dentry->d_inode), NFSPROC_SETATTR, &arg, fattr, 0);
 	dprintk("NFS reply setattr\n");
 	return status;
 }
 
-int
-nfs_proc_lookup(struct nfs_server *server, struct nfs_fh *dir, const char *name,
-		    struct nfs_fh *fhandle, struct nfs_fattr *fattr)
+static int
+nfs_proc_lookup(struct dentry *dir, fattr *dir_attr, qstr *name,
+		struct nfs_fh *fhandle, fattr *fattr)
 {
-	struct nfs_diropargs	arg = { dir, name };
+	struct nfs_diropargs	arg = { NFS_FH(dir), name->name, name->len };
 	struct nfs_diropok	res = { fhandle, fattr };
 	int			status;
 
-	dprintk("NFS call  lookup %s\n", name);
-	status = rpc_call(server->client, NFSPROC_LOOKUP, &arg, &res, 0);
+	dprintk("NFS call  lookup %s\n", name->name);
+	dir_attr->valid = 0;
+	fattr->valid = 0;
+	status = rpc_call(NFS_CLIENT(dir->d_inode), NFSPROC_LOOKUP, &arg, &res, 0);
 	dprintk("NFS reply lookup: %d\n", status);
 	return status;
 }
 
-int
-nfs_proc_readlink(struct nfs_server *server, struct nfs_fh *fhandle,
-			void **p0, char **string, unsigned int *len,
-			unsigned int maxlen)
+static int
+nfs_proc_readlink(struct dentry *dentry, fattr *fattr,
+			void *buffer, unsigned int bufsiz)
 {
-	struct nfs_readlinkres	res = { string, len, maxlen, NULL };
+	struct nfs_readlinkargs	args = { NFS_FH(dentry), buffer, bufsiz };
+	struct nfs_readlinkres	res = { buffer, bufsiz };
 	int			status;
 
 	dprintk("NFS call  readlink\n");
-	status = rpc_call(server->client, NFSPROC_READLINK, fhandle, &res, 0);
+	fattr->valid = 0;
+	status = rpc_call(NFS_CLIENT(dentry->d_inode), NFSPROC_READLINK,
+					&args, &res, 0);
 	dprintk("NFS reply readlink: %d\n", status);
-	if (!status)
-		*p0 = res.buffer;
-	else if (res.buffer)
-		kfree(res.buffer);
 	return status;
 }
 
-int
-nfs_proc_read(struct nfs_server *server, struct nfs_fh *fhandle, int swap,
-			  unsigned long offset, unsigned int count,
-			  void *buffer, struct nfs_fattr *fattr)
-{
-	struct nfs_readargs	arg = { fhandle, offset, count, buffer };
-	struct nfs_readres	res = { fattr, count };
+static int
+nfs_proc_read(struct dentry *dentry, fattr *fattr,
+	      struct rpc_cred *cred, int flags,
+	      unsigned long offset, unsigned int count,
+	      void *buffer, int *eofp)
+{
+	struct nfs_readargs	arg = { NFS_FH(dentry), offset, count, 1,
+				       {{ buffer, count }, {0,0}, {0,0}, {0,0},
+					{0,0}, {0,0}, {0,0}, {0,0}} };
+	struct nfs_readres	res = { fattr, count, 0};
+	struct rpc_message	msg = { NFSPROC_READ, &arg, &res, cred };
 	int			status;
 
 	dprintk("NFS call  read %d @ %ld\n", count, offset);
-	status = rpc_call(server->client, NFSPROC_READ, &arg, &res,
-			swap? NFS_RPC_SWAPFLAGS : 0);
+	fattr->valid = 0;
+	status = rpc_call_sync(NFS_CLIENT(dentry->d_inode), &msg, flags);
+
 	dprintk("NFS reply read: %d\n", status);
+	*eofp = res.eof;
 	return status;
 }
 
-int
-nfs_proc_write(struct nfs_server *server, struct nfs_fh *fhandle, int swap,
-			unsigned long offset, unsigned int count,
-			const void *buffer, struct nfs_fattr *fattr)
-{
-	struct nfs_writeargs	arg = { fhandle, offset, count, buffer };
-	int			status;
+static int
+nfs_proc_write(struct dentry *dentry, fattr *fattr,
+	       struct rpc_cred *cred, int how,
+	       unsigned long offset, unsigned int count,
+	       void *buffer, struct nfs_writeverf *verf)
+{
+	struct nfs_writeargs	arg = {NFS_FH(dentry), offset, count,
+					NFS_FILE_SYNC, 1,
+					{{buffer, count}, {0,0}, {0,0}, {0,0},
+					 {0,0}, {0,0}, {0,0}, {0,0}}};
+	struct nfs_writeres     res = {fattr, verf, count};
+	struct rpc_message	msg = { NFSPROC_WRITE, &arg, &res, cred };
+	int			status, flags = 0;
 
 	dprintk("NFS call  write %d @ %ld\n", count, offset);
-	status = rpc_call(server->client, NFSPROC_WRITE, &arg, fattr,
-			swap? (RPC_TASK_SWAPPER|RPC_TASK_ROOTCREDS) : 0);
-	dprintk("NFS reply read: %d\n", status);
+	fattr->valid = 0;
+	if (how & NFS_RW_SWAP)
+		flags |= NFS_RPC_SWAPFLAGS;
+	status = rpc_call_sync(NFS_CLIENT(dentry->d_inode), &msg, flags);
+
+	dprintk("NFS reply write: %d\n", status);
+	verf->committed = NFS_FILE_SYNC;      /* NFSv2 always syncs data */
 	return status < 0? status : count;
 }
 
-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)
+static int
+nfs_proc_create(struct dentry *dir, fattr *dir_attr,
+		qstr *name, struct iattr *sattr, int flags,
+		struct nfs_fh *fhandle, fattr *fattr)
 {
-	struct nfs_createargs	arg = { dir, name, sattr };
+	struct nfs_createargs	arg = { NFS_FH(dir), name->name,
+					name->len, sattr };
 	struct nfs_diropok	res = { fhandle, fattr };
 	int			status;
 
-	dprintk("NFS call  create %s\n", name);
-	status = rpc_call(server->client, NFSPROC_CREATE, &arg, &res, 0);
+	dir_attr->valid = 0;
+	fattr->valid = 0;
+	dprintk("NFS call  create %s\n", name->name);
+	status = rpc_call(NFS_CLIENT(dir->d_inode), NFSPROC_CREATE, &arg, &res, 0);
 	dprintk("NFS reply create: %d\n", status);
 	return status;
 }
 
-int
-nfs_proc_remove(struct nfs_server *server, struct nfs_fh *dir, const char *name)
+/*
+ * In NFSv2, mknod is grafted onto the create call.
+ */
+static int
+nfs_proc_mknod(struct dentry *dir, fattr *dir_attr,
+			qstr *name, struct iattr *sattr, dev_t rdev,
+			struct nfs_fh *fhandle, fattr *fattr)
 {
-	struct nfs_diropargs	arg = { dir, name };
-	int			status;
+	struct nfs_createargs	arg = { NFS_FH(dir), name->name,
+						     name->len, sattr };
+	struct nfs_diropok	res = { fhandle, fattr };
+	int			status, mode;
+
+	dprintk("NFS call  mknod %s\n", name->name);
+
+	mode = sattr->ia_mode;
+	if (S_ISFIFO(mode)) {
+		sattr->ia_mode = (mode & ~S_IFMT) | S_IFCHR;
+		sattr->ia_valid &= ~ATTR_SIZE;
+	} else if (S_ISCHR(mode) || S_ISBLK(mode)) {
+		sattr->ia_valid |= ATTR_SIZE;
+		sattr->ia_size   = rdev;	/* get out your barf bag */
+	}
+
+	dir_attr->valid = 0;
+	fattr->valid = 0;
+	status = rpc_call(NFS_CLIENT(dir->d_inode), NFSPROC_CREATE, &arg, &res, 0);
+
+	if (status == -EINVAL && S_ISFIFO(mode)) {
+		sattr->ia_mode = mode;
+		dir_attr->valid = 0;
+		fattr->valid = 0;
+		status = rpc_call(NFS_CLIENT(dir->d_inode), NFSPROC_CREATE, &arg, &res, 0);
+	}
+	dprintk("NFS reply mknod: %d\n", status);
+	return status;
+}
+  
+static int
+nfs_proc_remove(struct dentry *dir, fattr *dir_attr, qstr *name)
+{
+	struct nfs_diropargs	arg = { NFS_FH(dir), name->name, name->len };
+	struct rpc_message	msg = { NFSPROC_REMOVE, &arg, NULL, NULL };
+	int			status;
+
+	dir_attr->valid = 0;
+	dprintk("NFS call  remove %s\n", name->name);
+	status = rpc_call_sync(NFS_CLIENT(dir->d_inode), &msg, 0);
 
-	dprintk("NFS call  remove %s\n", name);
-	status = rpc_call(server->client, NFSPROC_REMOVE, &arg, NULL, 0);
 	dprintk("NFS reply remove: %d\n", status);
 	return 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)
+static int
+nfs_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir, struct qstr *name)
 {
-	struct nfs_renameargs	arg = { old_dir, old_name, new_dir, new_name };
-	int			status;
+	struct nfs_diropargs	*arg;
 
-	dprintk("NFS call  rename %s -> %s\n", old_name, new_name);
-	status = rpc_call(server->client, NFSPROC_RENAME, &arg, NULL, 0);
+	arg = (struct nfs_diropargs *)kmalloc(sizeof(*arg), GFP_KERNEL);
+	if (!arg)
+		return -ENOMEM;
+	memset(arg, 0, sizeof(*arg));
+	arg->fh = NFS_FH(dir);
+	arg->name = name->name;
+	arg->len = name->len;
+	msg->rpc_proc = NFSPROC_REMOVE;
+	msg->rpc_argp = arg;
+	return 0;
+}
+
+static void
+nfs_proc_unlink_done(struct dentry *dir, struct rpc_message *msg)
+{
+	if (msg->rpc_argp) {
+		NFS_CACHEINV(dir->d_inode);
+		kfree(msg->rpc_argp);
+	}
+}
+
+static int
+nfs_proc_rename(struct dentry *old_dir, fattr *old_attr, qstr *old_name,
+		struct dentry *new_dir, fattr *new_attr, qstr *new_name)
+{
+	struct nfs_renameargs	arg = { NFS_FH(old_dir), old_name->name,
+					old_name->len,
+					NFS_FH(new_dir), new_name->name,
+					new_name->len};
+	int			status;
+
+	dprintk("NFS call  rename %s -> %s\n", old_name->name, new_name->name);
+	old_attr->valid = 0;
+	new_attr->valid = 0;
+	status = rpc_call(NFS_CLIENT(old_dir->d_inode), NFSPROC_RENAME, &arg, NULL, 0);
 	dprintk("NFS reply rename: %d\n", status);
 	return status;
 }
 
-int
-nfs_proc_link(struct nfs_server *server, struct nfs_fh *fhandle,
-			struct nfs_fh *dir, const char *name)
-{
-	struct nfs_linkargs	arg = { fhandle, dir, name };
+static int
+nfs_proc_link(struct dentry *dentry, fattr *attr,
+	      struct dentry *dir, fattr *dir_attr, qstr *name)
+{
+	struct nfs_linkargs	arg = { NFS_FH(dentry), NFS_FH(dir),
+					name->name, name->len };
 	int			status;
 
-	dprintk("NFS call  link %s\n", name);
-	status = rpc_call(server->client, NFSPROC_LINK, &arg, NULL, 0);
+	dprintk("NFS call  link %s\n", name->name);
+	dir_attr->valid = 0;
+	attr->valid = 0;
+	status = rpc_call(NFS_CLIENT(dentry->d_inode), NFSPROC_LINK, &arg, NULL, 0);
 	dprintk("NFS reply link: %d\n", status);
 	return status;
 }
 
-int
-nfs_proc_symlink(struct nfs_server *server, struct nfs_fh *dir,
-			const char *name, const char *path,
-			struct nfs_sattr *sattr)
-{
-	struct nfs_symlinkargs	arg = { dir, name, path, sattr };
+static int
+nfs_proc_symlink(struct dentry *dir, fattr *dir_attr, qstr *name,
+		 qstr *path, struct iattr *sattr,
+		 struct nfs_fh *sym_fh, fattr *sym_attr)
+{
+	struct nfs_symlinkargs	arg = { NFS_FH(dir), name->name, name->len,
+					path->name, path->len, sattr };
 	int			status;
 
-	dprintk("NFS call  symlink %s -> %s\n", name, path);
-	status = rpc_call(server->client, NFSPROC_SYMLINK, &arg, NULL, 0);
+	dprintk("NFS call  symlink %s -> %s\n", name->name, path->name);
+	dir_attr->valid = 0;
+	sym_attr->valid = 0;
+	status = rpc_call(NFS_CLIENT(dir->d_inode), NFSPROC_SYMLINK, &arg, NULL, 0);
 	dprintk("NFS reply symlink: %d\n", status);
 	return 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)
+static int
+nfs_proc_mkdir(struct dentry *dir, fattr *dir_attr, qstr *name,
+	       struct iattr *sattr,
+	       struct nfs_fh *fhandle, fattr *fattr)
 {
-	struct nfs_createargs	arg = { dir, name, sattr };
+	struct nfs_createargs	arg = { NFS_FH(dir), name->name, name->len,
+					sattr };
 	struct nfs_diropok	res = { fhandle, fattr };
 	int			status;
 
-	dprintk("NFS call  mkdir %s\n", name);
-	status = rpc_call(server->client, NFSPROC_MKDIR, &arg, &res, 0);
+	dprintk("NFS call  mkdir %s\n", name->name);
+	dir_attr->valid = 0;
+	fattr->valid = 0;
+	status = rpc_call(NFS_CLIENT(dir->d_inode), NFSPROC_MKDIR, &arg, &res, 0);
 	dprintk("NFS reply mkdir: %d\n", status);
 	return status;
 }
 
-int
-nfs_proc_rmdir(struct nfs_server *server, struct nfs_fh *dir, const char *name)
+static int
+nfs_proc_rmdir(struct dentry *dir, fattr *dir_attr, qstr *name)
 {
-	struct nfs_diropargs	arg = { dir, name };
+	struct nfs_diropargs	arg = { NFS_FH(dir), name->name, name->len };
 	int			status;
 
-	dprintk("NFS call  rmdir %s\n", name);
-	status = rpc_call(server->client, NFSPROC_RMDIR, &arg, NULL, 0);
+	dprintk("NFS call  rmdir %s\n", name->name);
+	dir_attr->valid = 0;
+	status = rpc_call(NFS_CLIENT(dir->d_inode), NFSPROC_RMDIR, &arg, NULL, 0);
 	dprintk("NFS reply rmdir: %d\n", status);
 	return status;
 }
@@ -237,66 +364,71 @@
 /*
  * The READDIR implementation is somewhat hackish - we pass a temporary
  * buffer to the encode function, which installs it in the receive
- * iovec. The dirent buffer itself is passed in the result struct.
+ * the receive iovec. The decode function just parses the reply to make
+ * sure it is syntactically correct; the entries itself are decoded
+ * from nfs_readdir by calling the decode_entry function directly.
  */
-int
-nfs_proc_readdir(struct nfs_server *server, struct nfs_fh *fhandle,
-			u32 cookie, unsigned int size, __u32 *entry)
+static int
+nfs_proc_readdir(struct dentry *dir, fattr *dir_attr,
+		 struct rpc_cred *cred,
+		 __u64 cookie, void *entry, unsigned int size, int plus)
 {
 	struct nfs_readdirargs	arg;
 	struct nfs_readdirres	res;
-	void *			buffer;
-	unsigned int		buf_size = PAGE_SIZE;
+	struct rpc_message	msg = { NFSPROC_READDIR, &arg, &res, cred };
 	int			status;
 
-	/* First get a temp buffer for the readdir reply */
-	/* N.B. does this really need to be cleared? */
-	status = -ENOMEM;
-	buffer = (void *) get_free_page(GFP_KERNEL);
-	if (!buffer)
-		goto out;
-
-	/*
-	 * Calculate the effective size the buffer.  To make sure
-	 * that the returned data will fit into the user's buffer,
-	 * we decrease the buffer size as necessary.
-	 *
-	 * Note: NFS returns three __u32 values for each entry,
-	 * and we assume that the data is packed into the user
-	 * buffer with the same efficiency. 
-	 */
-	if (size < buf_size)
-		buf_size = size;
-	if (server->rsize < buf_size)
-		buf_size = server->rsize;
-#if 0
-printk("nfs_proc_readdir: user size=%d, rsize=%d, buf_size=%d\n",
-size, server->rsize, buf_size);
-#endif
-
-	arg.fh = fhandle;
+	dir_attr->valid = 0;
+	arg.fh = NFS_FH(dir);
 	arg.cookie = cookie;
-	arg.buffer = buffer;
-	arg.bufsiz = buf_size;
+	arg.buffer = entry;
+	arg.bufsiz = size;
 	res.buffer = entry;
 	res.bufsiz = size;
 
-	dprintk("NFS call  readdir %d\n", cookie);
-	status = rpc_call(server->client, NFSPROC_READDIR, &arg, &res, 0);
+	dir_attr->valid = 0;
+	dprintk("NFS call  readdir %d\n", (unsigned int)cookie);
+	status = rpc_call_sync(NFS_CLIENT(dir->d_inode), &msg, 0);
+
 	dprintk("NFS reply readdir: %d\n", status);
-	free_page((unsigned long) buffer);
-out:
 	return status;
 }
 
-int
+static int
 nfs_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
 			struct nfs_fsinfo *info)
 {
 	int	status;
 
 	dprintk("NFS call  statfs\n");
+	memset((char *)info, 0, sizeof(*info));
 	status = rpc_call(server->client, NFSPROC_STATFS, fhandle, info, 0);
 	dprintk("NFS reply statfs: %d\n", status);
 	return status;
 }
+
+struct nfs_rpc_ops     nfs_v2_clientops = {
+       2,		       /* protocol version */
+       nfs_proc_get_root,
+       nfs_proc_getattr,
+       nfs_proc_setattr,
+       nfs_proc_lookup,
+       NULL,		       /* access */
+       nfs_proc_readlink,
+       nfs_proc_read,
+       nfs_proc_write,
+       NULL,		       /* commit */
+       nfs_proc_create,
+       nfs_proc_remove,
+       nfs_proc_unlink_setup,
+       nfs_proc_unlink_done,
+       nfs_proc_rename,
+       nfs_proc_link,
+       nfs_proc_symlink,
+       nfs_proc_mkdir,
+       nfs_proc_rmdir,
+       nfs_proc_readdir,
+       nfs_proc_mknod,
+       nfs_proc_statfs,
+       nfs_decode_dirent,
+};