Initial import

1 files changed, 1123 insertions, 0 deletions

diff --git a/fs/afs/dir.c b/fs/afs/dir.c
new file mode 100644
index 000000000..e10e17788
--- /dev/null
+++ b/fs/afs/dir.c
@@ -0,0 +1,1123 @@
+/* dir.c: AFS filesystem directory handling
+ *
+ * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/fs.h>
+#include <linux/namei.h>
+#include <linux/pagemap.h>
+#include <linux/ctype.h>
+#include <linux/sched.h>
+#include "internal.h"
+
+static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry,
+				 unsigned int flags);
+static int afs_dir_open(struct inode *inode, struct file *file);
+static int afs_readdir(struct file *file, struct dir_context *ctx);
+static int afs_d_revalidate(struct dentry *dentry, unsigned int flags);
+static int afs_d_delete(const struct dentry *dentry);
+static void afs_d_release(struct dentry *dentry);
+static int afs_lookup_filldir(struct dir_context *ctx, const char *name, int nlen,
+				  loff_t fpos, u64 ino, unsigned dtype);
+static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
+		      bool excl);
+static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode);
+static int afs_rmdir(struct inode *dir, struct dentry *dentry);
+static int afs_unlink(struct inode *dir, struct dentry *dentry);
+static int afs_link(struct dentry *from, struct inode *dir,
+		    struct dentry *dentry);
+static int afs_symlink(struct inode *dir, struct dentry *dentry,
+		       const char *content);
+static int afs_rename(struct inode *old_dir, struct dentry *old_dentry,
+		      struct inode *new_dir, struct dentry *new_dentry);
+
+const struct file_operations afs_dir_file_operations = {
+	.open		= afs_dir_open,
+	.release	= afs_release,
+	.iterate	= afs_readdir,
+	.lock		= afs_lock,
+	.llseek		= generic_file_llseek,
+};
+
+const struct inode_operations afs_dir_inode_operations = {
+	.create		= afs_create,
+	.lookup		= afs_lookup,
+	.link		= afs_link,
+	.unlink		= afs_unlink,
+	.symlink	= afs_symlink,
+	.mkdir		= afs_mkdir,
+	.rmdir		= afs_rmdir,
+	.rename		= afs_rename,
+	.permission	= afs_permission,
+	.getattr	= afs_getattr,
+	.setattr	= afs_setattr,
+};
+
+const struct dentry_operations afs_fs_dentry_operations = {
+	.d_revalidate	= afs_d_revalidate,
+	.d_delete	= afs_d_delete,
+	.d_release	= afs_d_release,
+	.d_automount	= afs_d_automount,
+};
+
+#define AFS_DIR_HASHTBL_SIZE	128
+#define AFS_DIR_DIRENT_SIZE	32
+#define AFS_DIRENT_PER_BLOCK	64
+
+union afs_dirent {
+	struct {
+		uint8_t		valid;
+		uint8_t		unused[1];
+		__be16		hash_next;
+		__be32		vnode;
+		__be32		unique;
+		uint8_t		name[16];
+		uint8_t		overflow[4];	/* if any char of the name (inc
+						 * NUL) reaches here, consume
+						 * the next dirent too */
+	} u;
+	uint8_t	extended_name[32];
+};
+
+/* AFS directory page header (one at the beginning of every 2048-byte chunk) */
+struct afs_dir_pagehdr {
+	__be16		npages;
+	__be16		magic;
+#define AFS_DIR_MAGIC htons(1234)
+	uint8_t		nentries;
+	uint8_t		bitmap[8];
+	uint8_t		pad[19];
+};
+
+/* directory block layout */
+union afs_dir_block {
+
+	struct afs_dir_pagehdr pagehdr;
+
+	struct {
+		struct afs_dir_pagehdr	pagehdr;
+		uint8_t			alloc_ctrs[128];
+		/* dir hash table */
+		uint16_t		hashtable[AFS_DIR_HASHTBL_SIZE];
+	} hdr;
+
+	union afs_dirent dirents[AFS_DIRENT_PER_BLOCK];
+};
+
+/* layout on a linux VM page */
+struct afs_dir_page {
+	union afs_dir_block blocks[PAGE_SIZE / sizeof(union afs_dir_block)];
+};
+
+struct afs_lookup_cookie {
+	struct dir_context ctx;
+	struct afs_fid	fid;
+	struct qstr name;
+	int		found;
+};
+
+/*
+ * check that a directory page is valid
+ */
+static inline void afs_dir_check_page(struct inode *dir, struct page *page)
+{
+	struct afs_dir_page *dbuf;
+	loff_t latter;
+	int tmp, qty;
+
+#if 0
+	/* check the page count */
+	qty = desc.size / sizeof(dbuf->blocks[0]);
+	if (qty == 0)
+		goto error;
+
+	if (page->index == 0 && qty != ntohs(dbuf->blocks[0].pagehdr.npages)) {
+		printk("kAFS: %s(%lu): wrong number of dir blocks %d!=%hu\n",
+		       __func__, dir->i_ino, qty,
+		       ntohs(dbuf->blocks[0].pagehdr.npages));
+		goto error;
+	}
+#endif
+
+	/* determine how many magic numbers there should be in this page */
+	latter = dir->i_size - page_offset(page);
+	if (latter >= PAGE_SIZE)
+		qty = PAGE_SIZE;
+	else
+		qty = latter;
+	qty /= sizeof(union afs_dir_block);
+
+	/* check them */
+	dbuf = page_address(page);
+	for (tmp = 0; tmp < qty; tmp++) {
+		if (dbuf->blocks[tmp].pagehdr.magic != AFS_DIR_MAGIC) {
+			printk("kAFS: %s(%lu): bad magic %d/%d is %04hx\n",
+			       __func__, dir->i_ino, tmp, qty,
+			       ntohs(dbuf->blocks[tmp].pagehdr.magic));
+			goto error;
+		}
+	}
+
+	SetPageChecked(page);
+	return;
+
+error:
+	SetPageChecked(page);
+	SetPageError(page);
+}
+
+/*
+ * discard a page cached in the pagecache
+ */
+static inline void afs_dir_put_page(struct page *page)
+{
+	kunmap(page);
+	page_cache_release(page);
+}
+
+/*
+ * get a page into the pagecache
+ */
+static struct page *afs_dir_get_page(struct inode *dir, unsigned long index,
+				     struct key *key)
+{
+	struct page *page;
+	_enter("{%lu},%lu", dir->i_ino, index);
+
+	page = read_cache_page(dir->i_mapping, index, afs_page_filler, key);
+	if (!IS_ERR(page)) {
+		kmap(page);
+		if (!PageChecked(page))
+			afs_dir_check_page(dir, page);
+		if (PageError(page))
+			goto fail;
+	}
+	return page;
+
+fail:
+	afs_dir_put_page(page);
+	_leave(" = -EIO");
+	return ERR_PTR(-EIO);
+}
+
+/*
+ * open an AFS directory file
+ */
+static int afs_dir_open(struct inode *inode, struct file *file)
+{
+	_enter("{%lu}", inode->i_ino);
+
+	BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048);
+	BUILD_BUG_ON(sizeof(union afs_dirent) != 32);
+
+	if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(inode)->flags))
+		return -ENOENT;
+
+	return afs_open(inode, file);
+}
+
+/*
+ * deal with one block in an AFS directory
+ */
+static int afs_dir_iterate_block(struct dir_context *ctx,
+				 union afs_dir_block *block,
+				 unsigned blkoff)
+{
+	union afs_dirent *dire;
+	unsigned offset, next, curr;
+	size_t nlen;
+	int tmp;
+
+	_enter("%u,%x,%p,,",(unsigned)ctx->pos,blkoff,block);
+
+	curr = (ctx->pos - blkoff) / sizeof(union afs_dirent);
+
+	/* walk through the block, an entry at a time */
+	for (offset = AFS_DIRENT_PER_BLOCK - block->pagehdr.nentries;
+	     offset < AFS_DIRENT_PER_BLOCK;
+	     offset = next
+	     ) {
+		next = offset + 1;
+
+		/* skip entries marked unused in the bitmap */
+		if (!(block->pagehdr.bitmap[offset / 8] &
+		      (1 << (offset % 8)))) {
+			_debug("ENT[%Zu.%u]: unused",
+			       blkoff / sizeof(union afs_dir_block), offset);
+			if (offset >= curr)
+				ctx->pos = blkoff +
+					next * sizeof(union afs_dirent);
+			continue;
+		}
+
+		/* got a valid entry */
+		dire = &block->dirents[offset];
+		nlen = strnlen(dire->u.name,
+			       sizeof(*block) -
+			       offset * sizeof(union afs_dirent));
+
+		_debug("ENT[%Zu.%u]: %s %Zu \"%s\"",
+		       blkoff / sizeof(union afs_dir_block), offset,
+		       (offset < curr ? "skip" : "fill"),
+		       nlen, dire->u.name);
+
+		/* work out where the next possible entry is */
+		for (tmp = nlen; tmp > 15; tmp -= sizeof(union afs_dirent)) {
+			if (next >= AFS_DIRENT_PER_BLOCK) {
+				_debug("ENT[%Zu.%u]:"
+				       " %u travelled beyond end dir block"
+				       " (len %u/%Zu)",
+				       blkoff / sizeof(union afs_dir_block),
+				       offset, next, tmp, nlen);
+				return -EIO;
+			}
+			if (!(block->pagehdr.bitmap[next / 8] &
+			      (1 << (next % 8)))) {
+				_debug("ENT[%Zu.%u]:"
+				       " %u unmarked extension (len %u/%Zu)",
+				       blkoff / sizeof(union afs_dir_block),
+				       offset, next, tmp, nlen);
+				return -EIO;
+			}
+
+			_debug("ENT[%Zu.%u]: ext %u/%Zu",
+			       blkoff / sizeof(union afs_dir_block),
+			       next, tmp, nlen);
+			next++;
+		}
+
+		/* skip if starts before the current position */
+		if (offset < curr)
+			continue;
+
+		/* found the next entry */
+		if (!dir_emit(ctx, dire->u.name, nlen,
+			      ntohl(dire->u.vnode),
+			      ctx->actor == afs_lookup_filldir ?
+			      ntohl(dire->u.unique) : DT_UNKNOWN)) {
+			_leave(" = 0 [full]");
+			return 0;
+		}
+
+		ctx->pos = blkoff + next * sizeof(union afs_dirent);
+	}
+
+	_leave(" = 1 [more]");
+	return 1;
+}
+
+/*
+ * iterate through the data blob that lists the contents of an AFS directory
+ */
+static int afs_dir_iterate(struct inode *dir, struct dir_context *ctx,
+			   struct key *key)
+{
+	union afs_dir_block *dblock;
+	struct afs_dir_page *dbuf;
+	struct page *page;
+	unsigned blkoff, limit;
+	int ret;
+
+	_enter("{%lu},%u,,", dir->i_ino, (unsigned)ctx->pos);
+
+	if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) {
+		_leave(" = -ESTALE");
+		return -ESTALE;
+	}
+
+	/* round the file position up to the next entry boundary */
+	ctx->pos += sizeof(union afs_dirent) - 1;
+	ctx->pos &= ~(sizeof(union afs_dirent) - 1);
+
+	/* walk through the blocks in sequence */
+	ret = 0;
+	while (ctx->pos < dir->i_size) {
+		blkoff = ctx->pos & ~(sizeof(union afs_dir_block) - 1);
+
+		/* fetch the appropriate page from the directory */
+		page = afs_dir_get_page(dir, blkoff / PAGE_SIZE, key);
+		if (IS_ERR(page)) {
+			ret = PTR_ERR(page);
+			break;
+		}
+
+		limit = blkoff & ~(PAGE_SIZE - 1);
+
+		dbuf = page_address(page);
+
+		/* deal with the individual blocks stashed on this page */
+		do {
+			dblock = &dbuf->blocks[(blkoff % PAGE_SIZE) /
+					       sizeof(union afs_dir_block)];
+			ret = afs_dir_iterate_block(ctx, dblock, blkoff);
+			if (ret != 1) {
+				afs_dir_put_page(page);
+				goto out;
+			}
+
+			blkoff += sizeof(union afs_dir_block);
+
+		} while (ctx->pos < dir->i_size && blkoff < limit);
+
+		afs_dir_put_page(page);
+		ret = 0;
+	}
+
+out:
+	_leave(" = %d", ret);
+	return ret;
+}
+
+/*
+ * read an AFS directory
+ */
+static int afs_readdir(struct file *file, struct dir_context *ctx)
+{
+	return afs_dir_iterate(file_inode(file), 
+			      ctx, file->private_data);
+}
+
+/*
+ * search the directory for a name
+ * - if afs_dir_iterate_block() spots this function, it'll pass the FID
+ *   uniquifier through dtype
+ */
+static int afs_lookup_filldir(struct dir_context *ctx, const char *name,
+			      int nlen, loff_t fpos, u64 ino, unsigned dtype)
+{
+	struct afs_lookup_cookie *cookie =
+		container_of(ctx, struct afs_lookup_cookie, ctx);
+
+	_enter("{%s,%u},%s,%u,,%llu,%u",
+	       cookie->name.name, cookie->name.len, name, nlen,
+	       (unsigned long long) ino, dtype);
+
+	/* insanity checks first */
+	BUILD_BUG_ON(sizeof(union afs_dir_block) != 2048);
+	BUILD_BUG_ON(sizeof(union afs_dirent) != 32);
+
+	if (cookie->name.len != nlen ||
+	    memcmp(cookie->name.name, name, nlen) != 0) {
+		_leave(" = 0 [no]");
+		return 0;
+	}
+
+	cookie->fid.vnode = ino;
+	cookie->fid.unique = dtype;
+	cookie->found = 1;
+
+	_leave(" = -1 [found]");
+	return -1;
+}
+
+/*
+ * do a lookup in a directory
+ * - just returns the FID the dentry name maps to if found
+ */
+static int afs_do_lookup(struct inode *dir, struct dentry *dentry,
+			 struct afs_fid *fid, struct key *key)
+{
+	struct afs_super_info *as = dir->i_sb->s_fs_info;
+	struct afs_lookup_cookie cookie = {
+		.ctx.actor = afs_lookup_filldir,
+		.name = dentry->d_name,
+		.fid.vid = as->volume->vid
+	};
+	int ret;
+
+	_enter("{%lu},%p{%pd},", dir->i_ino, dentry, dentry);
+
+	/* search the directory */
+	ret = afs_dir_iterate(dir, &cookie.ctx, key);
+	if (ret < 0) {
+		_leave(" = %d [iter]", ret);
+		return ret;
+	}
+
+	ret = -ENOENT;
+	if (!cookie.found) {
+		_leave(" = -ENOENT [not found]");
+		return -ENOENT;
+	}
+
+	*fid = cookie.fid;
+	_leave(" = 0 { vn=%u u=%u }", fid->vnode, fid->unique);
+	return 0;
+}
+
+/*
+ * Try to auto mount the mountpoint with pseudo directory, if the autocell
+ * operation is setted.
+ */
+static struct inode *afs_try_auto_mntpt(
+	int ret, struct dentry *dentry, struct inode *dir, struct key *key,
+	struct afs_fid *fid)
+{
+	const char *devname = dentry->d_name.name;
+	struct afs_vnode *vnode = AFS_FS_I(dir);
+	struct inode *inode;
+
+	_enter("%d, %p{%pd}, {%x:%u}, %p",
+	       ret, dentry, dentry, vnode->fid.vid, vnode->fid.vnode, key);
+
+	if (ret != -ENOENT ||
+	    !test_bit(AFS_VNODE_AUTOCELL, &vnode->flags))
+		goto out;
+
+	inode = afs_iget_autocell(dir, devname, strlen(devname), key);
+	if (IS_ERR(inode)) {
+		ret = PTR_ERR(inode);
+		goto out;
+	}
+
+	*fid = AFS_FS_I(inode)->fid;
+	_leave("= %p", inode);
+	return inode;
+
+out:
+	_leave("= %d", ret);
+	return ERR_PTR(ret);
+}
+
+/*
+ * look up an entry in a directory
+ */
+static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry,
+				 unsigned int flags)
+{
+	struct afs_vnode *vnode;
+	struct afs_fid fid;
+	struct inode *inode;
+	struct key *key;
+	int ret;
+
+	vnode = AFS_FS_I(dir);
+
+	_enter("{%x:%u},%p{%pd},",
+	       vnode->fid.vid, vnode->fid.vnode, dentry, dentry);
+
+	ASSERTCMP(d_inode(dentry), ==, NULL);
+
+	if (dentry->d_name.len >= AFSNAMEMAX) {
+		_leave(" = -ENAMETOOLONG");
+		return ERR_PTR(-ENAMETOOLONG);
+	}
+
+	if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
+		_leave(" = -ESTALE");
+		return ERR_PTR(-ESTALE);
+	}
+
+	key = afs_request_key(vnode->volume->cell);
+	if (IS_ERR(key)) {
+		_leave(" = %ld [key]", PTR_ERR(key));
+		return ERR_CAST(key);
+	}
+
+	ret = afs_validate(vnode, key);
+	if (ret < 0) {
+		key_put(key);
+		_leave(" = %d [val]", ret);
+		return ERR_PTR(ret);
+	}
+
+	ret = afs_do_lookup(dir, dentry, &fid, key);
+	if (ret < 0) {
+		inode = afs_try_auto_mntpt(ret, dentry, dir, key, &fid);
+		if (!IS_ERR(inode)) {
+			key_put(key);
+			goto success;
+		}
+
+		ret = PTR_ERR(inode);
+		key_put(key);
+		if (ret == -ENOENT) {
+			d_add(dentry, NULL);
+			_leave(" = NULL [negative]");
+			return NULL;
+		}
+		_leave(" = %d [do]", ret);
+		return ERR_PTR(ret);
+	}
+	dentry->d_fsdata = (void *)(unsigned long) vnode->status.data_version;
+
+	/* instantiate the dentry */
+	inode = afs_iget(dir->i_sb, key, &fid, NULL, NULL);
+	key_put(key);
+	if (IS_ERR(inode)) {
+		_leave(" = %ld", PTR_ERR(inode));
+		return ERR_CAST(inode);
+	}
+
+success:
+	d_add(dentry, inode);
+	_leave(" = 0 { vn=%u u=%u } -> { ino=%lu v=%u }",
+	       fid.vnode,
+	       fid.unique,
+	       d_inode(dentry)->i_ino,
+	       d_inode(dentry)->i_generation);
+
+	return NULL;
+}
+
+/*
+ * check that a dentry lookup hit has found a valid entry
+ * - NOTE! the hit can be a negative hit too, so we can't assume we have an
+ *   inode
+ */
+static int afs_d_revalidate(struct dentry *dentry, unsigned int flags)
+{
+	struct afs_vnode *vnode, *dir;
+	struct afs_fid uninitialized_var(fid);
+	struct dentry *parent;
+	struct key *key;
+	void *dir_version;
+	int ret;
+
+	if (flags & LOOKUP_RCU)
+		return -ECHILD;
+
+	vnode = AFS_FS_I(d_inode(dentry));
+
+	if (d_really_is_positive(dentry))
+		_enter("{v={%x:%u} n=%pd fl=%lx},",
+		       vnode->fid.vid, vnode->fid.vnode, dentry,
+		       vnode->flags);
+	else
+		_enter("{neg n=%pd}", dentry);
+
+	key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell);
+	if (IS_ERR(key))
+		key = NULL;
+
+	/* lock down the parent dentry so we can peer at it */
+	parent = dget_parent(dentry);
+	dir = AFS_FS_I(d_inode(parent));
+
+	/* validate the parent directory */
+	if (test_bit(AFS_VNODE_MODIFIED, &dir->flags))
+		afs_validate(dir, key);
+
+	if (test_bit(AFS_VNODE_DELETED, &dir->flags)) {
+		_debug("%pd: parent dir deleted", dentry);
+		goto out_bad;
+	}
+
+	dir_version = (void *) (unsigned long) dir->status.data_version;
+	if (dentry->d_fsdata == dir_version)
+		goto out_valid; /* the dir contents are unchanged */
+
+	_debug("dir modified");
+
+	/* search the directory for this vnode */
+	ret = afs_do_lookup(&dir->vfs_inode, dentry, &fid, key);
+	switch (ret) {
+	case 0:
+		/* the filename maps to something */
+		if (d_really_is_negative(dentry))
+			goto out_bad;
+		if (is_bad_inode(d_inode(dentry))) {
+			printk("kAFS: afs_d_revalidate: %pd2 has bad inode\n",
+			       dentry);
+			goto out_bad;
+		}
+
+		/* if the vnode ID has changed, then the dirent points to a
+		 * different file */
+		if (fid.vnode != vnode->fid.vnode) {
+			_debug("%pd: dirent changed [%u != %u]",
+			       dentry, fid.vnode,
+			       vnode->fid.vnode);
+			goto not_found;
+		}
+
+		/* if the vnode ID uniqifier has changed, then the file has
+		 * been deleted and replaced, and the original vnode ID has
+		 * been reused */
+		if (fid.unique != vnode->fid.unique) {
+			_debug("%pd: file deleted (uq %u -> %u I:%u)",
+			       dentry, fid.unique,
+			       vnode->fid.unique,
+			       d_inode(dentry)->i_generation);
+			spin_lock(&vnode->lock);
+			set_bit(AFS_VNODE_DELETED, &vnode->flags);
+			spin_unlock(&vnode->lock);
+			goto not_found;
+		}
+		goto out_valid;
+
+	case -ENOENT:
+		/* the filename is unknown */
+		_debug("%pd: dirent not found", dentry);
+		if (d_really_is_positive(dentry))
+			goto not_found;
+		goto out_valid;
+
+	default:
+		_debug("failed to iterate dir %pd: %d",
+		       parent, ret);
+		goto out_bad;
+	}
+
+out_valid:
+	dentry->d_fsdata = dir_version;
+	dput(parent);
+	key_put(key);
+	_leave(" = 1 [valid]");
+	return 1;
+
+	/* the dirent, if it exists, now points to a different vnode */
+not_found:
+	spin_lock(&dentry->d_lock);
+	dentry->d_flags |= DCACHE_NFSFS_RENAMED;
+	spin_unlock(&dentry->d_lock);
+
+out_bad:
+	_debug("dropping dentry %pd2", dentry);
+	dput(parent);
+	key_put(key);
+
+	_leave(" = 0 [bad]");
+	return 0;
+}
+
+/*
+ * allow the VFS to enquire as to whether a dentry should be unhashed (mustn't
+ * sleep)
+ * - called from dput() when d_count is going to 0.
+ * - return 1 to request dentry be unhashed, 0 otherwise
+ */
+static int afs_d_delete(const struct dentry *dentry)
+{
+	_enter("%pd", dentry);
+
+	if (dentry->d_flags & DCACHE_NFSFS_RENAMED)
+		goto zap;
+
+	if (d_really_is_positive(dentry) &&
+	    (test_bit(AFS_VNODE_DELETED,   &AFS_FS_I(d_inode(dentry))->flags) ||
+	     test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(d_inode(dentry))->flags)))
+		goto zap;
+
+	_leave(" = 0 [keep]");
+	return 0;
+
+zap:
+	_leave(" = 1 [zap]");
+	return 1;
+}
+
+/*
+ * handle dentry release
+ */
+static void afs_d_release(struct dentry *dentry)
+{
+	_enter("%pd", dentry);
+}
+
+/*
+ * create a directory on an AFS filesystem
+ */
+static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
+{
+	struct afs_file_status status;
+	struct afs_callback cb;
+	struct afs_server *server;
+	struct afs_vnode *dvnode, *vnode;
+	struct afs_fid fid;
+	struct inode *inode;
+	struct key *key;
+	int ret;
+
+	dvnode = AFS_FS_I(dir);
+
+	_enter("{%x:%u},{%pd},%ho",
+	       dvnode->fid.vid, dvnode->fid.vnode, dentry, mode);
+
+	key = afs_request_key(dvnode->volume->cell);
+	if (IS_ERR(key)) {
+		ret = PTR_ERR(key);
+		goto error;
+	}
+
+	mode |= S_IFDIR;
+	ret = afs_vnode_create(dvnode, key, dentry->d_name.name,
+			       mode, &fid, &status, &cb, &server);
+	if (ret < 0)
+		goto mkdir_error;
+
+	inode = afs_iget(dir->i_sb, key, &fid, &status, &cb);
+	if (IS_ERR(inode)) {
+		/* ENOMEM at a really inconvenient time - just abandon the new
+		 * directory on the server */
+		ret = PTR_ERR(inode);
+		goto iget_error;
+	}
+
+	/* apply the status report we've got for the new vnode */
+	vnode = AFS_FS_I(inode);
+	spin_lock(&vnode->lock);
+	vnode->update_cnt++;
+	spin_unlock(&vnode->lock);
+	afs_vnode_finalise_status_update(vnode, server);
+	afs_put_server(server);
+
+	d_instantiate(dentry, inode);
+	if (d_unhashed(dentry)) {
+		_debug("not hashed");
+		d_rehash(dentry);
+	}
+	key_put(key);
+	_leave(" = 0");
+	return 0;
+
+iget_error:
+	afs_put_server(server);
+mkdir_error:
+	key_put(key);
+error:
+	d_drop(dentry);
+	_leave(" = %d", ret);
+	return ret;
+}
+
+/*
+ * remove a directory from an AFS filesystem
+ */
+static int afs_rmdir(struct inode *dir, struct dentry *dentry)
+{
+	struct afs_vnode *dvnode, *vnode;
+	struct key *key;
+	int ret;
+
+	dvnode = AFS_FS_I(dir);
+
+	_enter("{%x:%u},{%pd}",
+	       dvnode->fid.vid, dvnode->fid.vnode, dentry);
+
+	key = afs_request_key(dvnode->volume->cell);
+	if (IS_ERR(key)) {
+		ret = PTR_ERR(key);
+		goto error;
+	}
+
+	ret = afs_vnode_remove(dvnode, key, dentry->d_name.name, true);
+	if (ret < 0)
+		goto rmdir_error;
+
+	if (d_really_is_positive(dentry)) {
+		vnode = AFS_FS_I(d_inode(dentry));
+		clear_nlink(&vnode->vfs_inode);
+		set_bit(AFS_VNODE_DELETED, &vnode->flags);
+		afs_discard_callback_on_delete(vnode);
+	}
+
+	key_put(key);
+	_leave(" = 0");
+	return 0;
+
+rmdir_error:
+	key_put(key);
+error:
+	_leave(" = %d", ret);
+	return ret;
+}
+
+/*
+ * remove a file from an AFS filesystem
+ */
+static int afs_unlink(struct inode *dir, struct dentry *dentry)
+{
+	struct afs_vnode *dvnode, *vnode;
+	struct key *key;
+	int ret;
+
+	dvnode = AFS_FS_I(dir);
+
+	_enter("{%x:%u},{%pd}",
+	       dvnode->fid.vid, dvnode->fid.vnode, dentry);
+
+	ret = -ENAMETOOLONG;
+	if (dentry->d_name.len >= AFSNAMEMAX)
+		goto error;
+
+	key = afs_request_key(dvnode->volume->cell);
+	if (IS_ERR(key)) {
+		ret = PTR_ERR(key);
+		goto error;
+	}
+
+	if (d_really_is_positive(dentry)) {
+		vnode = AFS_FS_I(d_inode(dentry));
+
+		/* make sure we have a callback promise on the victim */
+		ret = afs_validate(vnode, key);
+		if (ret < 0)
+			goto error;
+	}
+
+	ret = afs_vnode_remove(dvnode, key, dentry->d_name.name, false);
+	if (ret < 0)
+		goto remove_error;
+
+	if (d_really_is_positive(dentry)) {
+		/* if the file wasn't deleted due to excess hard links, the
+		 * fileserver will break the callback promise on the file - if
+		 * it had one - before it returns to us, and if it was deleted,
+		 * it won't
+		 *
+		 * however, if we didn't have a callback promise outstanding,
+		 * or it was outstanding on a different server, then it won't
+		 * break it either...
+		 */
+		vnode = AFS_FS_I(d_inode(dentry));
+		if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
+			_debug("AFS_VNODE_DELETED");
+		if (test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags))
+			_debug("AFS_VNODE_CB_BROKEN");
+		set_bit(AFS_VNODE_CB_BROKEN, &vnode->flags);
+		ret = afs_validate(vnode, key);
+		_debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, ret);
+	}
+
+	key_put(key);
+	_leave(" = 0");
+	return 0;
+
+remove_error:
+	key_put(key);
+error:
+	_leave(" = %d", ret);
+	return ret;
+}
+
+/*
+ * create a regular file on an AFS filesystem
+ */
+static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
+		      bool excl)
+{
+	struct afs_file_status status;
+	struct afs_callback cb;
+	struct afs_server *server;
+	struct afs_vnode *dvnode, *vnode;
+	struct afs_fid fid;
+	struct inode *inode;
+	struct key *key;
+	int ret;
+
+	dvnode = AFS_FS_I(dir);
+
+	_enter("{%x:%u},{%pd},%ho,",
+	       dvnode->fid.vid, dvnode->fid.vnode, dentry, mode);
+
+	key = afs_request_key(dvnode->volume->cell);
+	if (IS_ERR(key)) {
+		ret = PTR_ERR(key);
+		goto error;
+	}
+
+	mode |= S_IFREG;
+	ret = afs_vnode_create(dvnode, key, dentry->d_name.name,
+			       mode, &fid, &status, &cb, &server);
+	if (ret < 0)
+		goto create_error;
+
+	inode = afs_iget(dir->i_sb, key, &fid, &status, &cb);
+	if (IS_ERR(inode)) {
+		/* ENOMEM at a really inconvenient time - just abandon the new
+		 * directory on the server */
+		ret = PTR_ERR(inode);
+		goto iget_error;
+	}
+
+	/* apply the status report we've got for the new vnode */
+	vnode = AFS_FS_I(inode);
+	spin_lock(&vnode->lock);
+	vnode->update_cnt++;
+	spin_unlock(&vnode->lock);
+	afs_vnode_finalise_status_update(vnode, server);
+	afs_put_server(server);
+
+	d_instantiate(dentry, inode);
+	if (d_unhashed(dentry)) {
+		_debug("not hashed");
+		d_rehash(dentry);
+	}
+	key_put(key);
+	_leave(" = 0");
+	return 0;
+
+iget_error:
+	afs_put_server(server);
+create_error:
+	key_put(key);
+error:
+	d_drop(dentry);
+	_leave(" = %d", ret);
+	return ret;
+}
+
+/*
+ * create a hard link between files in an AFS filesystem
+ */
+static int afs_link(struct dentry *from, struct inode *dir,
+		    struct dentry *dentry)
+{
+	struct afs_vnode *dvnode, *vnode;
+	struct key *key;
+	int ret;
+
+	vnode = AFS_FS_I(d_inode(from));
+	dvnode = AFS_FS_I(dir);
+
+	_enter("{%x:%u},{%x:%u},{%pd}",
+	       vnode->fid.vid, vnode->fid.vnode,
+	       dvnode->fid.vid, dvnode->fid.vnode,
+	       dentry);
+
+	key = afs_request_key(dvnode->volume->cell);
+	if (IS_ERR(key)) {
+		ret = PTR_ERR(key);
+		goto error;
+	}
+
+	ret = afs_vnode_link(dvnode, vnode, key, dentry->d_name.name);
+	if (ret < 0)
+		goto link_error;
+
+	ihold(&vnode->vfs_inode);
+	d_instantiate(dentry, &vnode->vfs_inode);
+	key_put(key);
+	_leave(" = 0");
+	return 0;
+
+link_error:
+	key_put(key);
+error:
+	d_drop(dentry);
+	_leave(" = %d", ret);
+	return ret;
+}
+
+/*
+ * create a symlink in an AFS filesystem
+ */
+static int afs_symlink(struct inode *dir, struct dentry *dentry,
+		       const char *content)
+{
+	struct afs_file_status status;
+	struct afs_server *server;
+	struct afs_vnode *dvnode, *vnode;
+	struct afs_fid fid;
+	struct inode *inode;
+	struct key *key;
+	int ret;
+
+	dvnode = AFS_FS_I(dir);
+
+	_enter("{%x:%u},{%pd},%s",
+	       dvnode->fid.vid, dvnode->fid.vnode, dentry,
+	       content);
+
+	ret = -EINVAL;
+	if (strlen(content) >= AFSPATHMAX)
+		goto error;
+
+	key = afs_request_key(dvnode->volume->cell);
+	if (IS_ERR(key)) {
+		ret = PTR_ERR(key);
+		goto error;
+	}
+
+	ret = afs_vnode_symlink(dvnode, key, dentry->d_name.name, content,
+				&fid, &status, &server);
+	if (ret < 0)
+		goto create_error;
+
+	inode = afs_iget(dir->i_sb, key, &fid, &status, NULL);
+	if (IS_ERR(inode)) {
+		/* ENOMEM at a really inconvenient time - just abandon the new
+		 * directory on the server */
+		ret = PTR_ERR(inode);
+		goto iget_error;
+	}
+
+	/* apply the status report we've got for the new vnode */
+	vnode = AFS_FS_I(inode);
+	spin_lock(&vnode->lock);
+	vnode->update_cnt++;
+	spin_unlock(&vnode->lock);
+	afs_vnode_finalise_status_update(vnode, server);
+	afs_put_server(server);
+
+	d_instantiate(dentry, inode);
+	if (d_unhashed(dentry)) {
+		_debug("not hashed");
+		d_rehash(dentry);
+	}
+	key_put(key);
+	_leave(" = 0");
+	return 0;
+
+iget_error:
+	afs_put_server(server);
+create_error:
+	key_put(key);
+error:
+	d_drop(dentry);
+	_leave(" = %d", ret);
+	return ret;
+}
+
+/*
+ * rename a file in an AFS filesystem and/or move it between directories
+ */
+static int afs_rename(struct inode *old_dir, struct dentry *old_dentry,
+		      struct inode *new_dir, struct dentry *new_dentry)
+{
+	struct afs_vnode *orig_dvnode, *new_dvnode, *vnode;
+	struct key *key;
+	int ret;
+
+	vnode = AFS_FS_I(d_inode(old_dentry));
+	orig_dvnode = AFS_FS_I(old_dir);
+	new_dvnode = AFS_FS_I(new_dir);
+
+	_enter("{%x:%u},{%x:%u},{%x:%u},{%pd}",
+	       orig_dvnode->fid.vid, orig_dvnode->fid.vnode,
+	       vnode->fid.vid, vnode->fid.vnode,
+	       new_dvnode->fid.vid, new_dvnode->fid.vnode,
+	       new_dentry);
+
+	key = afs_request_key(orig_dvnode->volume->cell);
+	if (IS_ERR(key)) {
+		ret = PTR_ERR(key);
+		goto error;
+	}
+
+	ret = afs_vnode_rename(orig_dvnode, new_dvnode, key,
+			       old_dentry->d_name.name,
+			       new_dentry->d_name.name);
+	if (ret < 0)
+		goto rename_error;
+	key_put(key);
+	_leave(" = 0");
+	return 0;
+
+rename_error:
+	key_put(key);
+error:
+	d_drop(new_dentry);
+	_leave(" = %d", ret);
+	return ret;
+}