Merge tag 'afs-next-20190507' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs

Pull AFS updates from David Howells:
 "A set of fix and development patches for AFS for 5.2.

  Summary:

   - Fix the AFS file locking so that sqlite can run on an AFS mount and
     also so that firefox and gnome can use a homedir that's mounted
     through AFS.

     This required emulation of fine-grained locking when the server
     will only support whole-file locks and no upgrade/downgrade. Four
     modes are provided, settable by mount parameter:

       "flock=local"   - No reference to the server

       "flock=openafs" - Fine-grained locks are local-only, whole-file
                         locks require sufficient server locks

       "flock=strict"  - All locks require sufficient server locks

       "flock=write"   - Always get an exclusive server lock

     If the volume is a read-only or backup volume, then flock=local for
     that volume.

   - Log extra information for a couple of cases where the client mucks
     up somehow: AFS vnode with undefined type and dir check failure -
     in both cases we seem to end up with unfilled data, but the issues
     happen infrequently and are difficult to reproduce at will.

   - Implement silly rename for unlink() and rename().

   - Set i_blocks so that du can get some information about usage.

   - Fix xattr handlers to return the right amount of data and to not
     overflow buffers.

   - Implement getting/setting raw AFS and YFS ACLs as xattrs"

* tag 'afs-next-20190507' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs:
  afs: Implement YFS ACL setting
  afs: Get YFS ACLs and information through xattrs
  afs: implement acl setting
  afs: Get an AFS3 ACL as an xattr
  afs: Fix getting the afs.fid xattr
  afs: Fix the afs.cell and afs.volume xattr handlers
  afs: Calculate i_blocks based on file size
  afs: Log more information for "kAFS: AFS vnode with undefined type\n"
  afs: Provide mount-time configurable byte-range file locking emulation
  afs: Add more tracepoints
  afs: Implement sillyrename for unlink and rename
  afs: Add directory reload tracepoint
  afs: Handle lock rpc ops failing on a file that got deleted
  afs: Improve dir check failure reports
  afs: Add file locking tracepoints
  afs: Further fix file locking
  afs: Fix AFS file locking to allow fine grained locks
  afs: Calculate lock extend timer from set/extend reply reception
  afs: Split wait from afs_make_call()

fs/afs/Makefile

@@ -13,6 +13,7 @@ kafs-y := \
 	cmservice.o \
 	dir.o \
 	dir_edit.o \
+	dir_silly.o \
 	dynroot.o \
 	file.o \
 	flock.o \

fs/afs/afs_fs.h

@@ -17,8 +17,10 @@
 
 enum AFS_FS_Operations {
 	FSFETCHDATA		= 130,	/* AFS Fetch file data */
+	FSFETCHACL		= 131,	/* AFS Fetch file ACL */
 	FSFETCHSTATUS		= 132,	/* AFS Fetch file status */
 	FSSTOREDATA		= 133,	/* AFS Store file data */
+	FSSTOREACL		= 134,	/* AFS Store file ACL */
 	FSSTORESTATUS		= 135,	/* AFS Store file status */
 	FSREMOVEFILE		= 136,	/* AFS Remove a file */
 	FSCREATEFILE		= 137,	/* AFS Create a file */

fs/afs/dir.c

@@ -26,6 +26,7 @@ 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_iput(struct dentry *dentry, struct inode *inode);
 static int afs_lookup_one_filldir(struct dir_context *ctx, const char *name, int nlen,
 				  loff_t fpos, u64 ino, unsigned dtype);
 static int afs_lookup_filldir(struct dir_context *ctx, const char *name, int nlen,
@@ -85,6 +86,7 @@ const struct dentry_operations afs_fs_dentry_operations = {
 	.d_delete	= afs_d_delete,
 	.d_release	= afs_d_release,
 	.d_automount	= afs_d_automount,
+	.d_iput		= afs_d_iput,
 };
 
 struct afs_lookup_one_cookie {
@@ -159,6 +161,38 @@ static bool afs_dir_check_page(struct afs_vnode *dvnode, struct page *page,
 	return false;
 }
 
+/*
+ * Check the contents of a directory that we've just read.
+ */
+static bool afs_dir_check_pages(struct afs_vnode *dvnode, struct afs_read *req)
+{
+	struct afs_xdr_dir_page *dbuf;
+	unsigned int i, j, qty = PAGE_SIZE / sizeof(union afs_xdr_dir_block);
+
+	for (i = 0; i < req->nr_pages; i++)
+		if (!afs_dir_check_page(dvnode, req->pages[i], req->actual_len))
+			goto bad;
+	return true;
+
+bad:
+	pr_warn("DIR %llx:%llx f=%llx l=%llx al=%llx r=%llx\n",
+		dvnode->fid.vid, dvnode->fid.vnode,
+		req->file_size, req->len, req->actual_len, req->remain);
+	pr_warn("DIR %llx %x %x %x\n",
+		req->pos, req->index, req->nr_pages, req->offset);
+
+	for (i = 0; i < req->nr_pages; i++) {
+		dbuf = kmap(req->pages[i]);
+		for (j = 0; j < qty; j++) {
+			union afs_xdr_dir_block *block = &dbuf->blocks[j];
+
+			pr_warn("[%02x] %32phN\n", i * qty + j, block);
+		}
+		kunmap(req->pages[i]);
+	}
+	return false;
+}
+
 /*
  * open an AFS directory file
  */
@@ -277,6 +311,7 @@ static struct afs_read *afs_read_dir(struct afs_vnode *dvnode, struct key *key)
 		goto error;
 
 	if (!test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags)) {
+		trace_afs_reload_dir(dvnode);
 		ret = afs_fetch_data(dvnode, key, req);
 		if (ret < 0)
 			goto error_unlock;
@@ -288,10 +323,8 @@ static struct afs_read *afs_read_dir(struct afs_vnode *dvnode, struct key *key)
 
 		/* Validate the data we just read. */
 		ret = -EIO;
-		for (i = 0; i < req->nr_pages; i++)
-			if (!afs_dir_check_page(dvnode, req->pages[i],
-						req->actual_len))
-				goto error_unlock;
+		if (!afs_dir_check_pages(dvnode, req))
+			goto error_unlock;
 
 		// TODO: Trim excess pages
 
@@ -743,7 +776,7 @@ static struct inode *afs_do_lookup(struct inode *dir, struct dentry *dentry,
 		ti = afs_iget(dir->i_sb, key, &cookie->fids[i],
 			      &cookie->statuses[i],
 			      &cookie->callbacks[i],
-			      cbi);
+			      cbi, dvnode);
 		if (i == 0) {
 			inode = ti;
 		} else {
@@ -875,8 +908,14 @@ static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry,
 			(void *)(unsigned long)dvnode->status.data_version;
 	}
 	d = d_splice_alias(inode, dentry);
-	if (!IS_ERR_OR_NULL(d))
+	if (!IS_ERR_OR_NULL(d)) {
 		d->d_fsdata = dentry->d_fsdata;
+		trace_afs_lookup(dvnode, &d->d_name,
+				 inode ? AFS_FS_I(inode) : NULL);
+	} else {
+		trace_afs_lookup(dvnode, &dentry->d_name,
+				 inode ? AFS_FS_I(inode) : NULL);
+	}
 	return d;
 }
 
@@ -1052,6 +1091,16 @@ static int afs_d_delete(const struct dentry *dentry)
 	return 1;
 }
 
+/*
+ * Clean up sillyrename files on dentry removal.
+ */
+static void afs_d_iput(struct dentry *dentry, struct inode *inode)
+{
+	if (dentry->d_flags & DCACHE_NFSFS_RENAMED)
+		afs_silly_iput(dentry, inode);
+	iput(inode);
+}
+
 /*
  * handle dentry release
  */
@@ -1076,7 +1125,7 @@ static void afs_vnode_new_inode(struct afs_fs_cursor *fc,
 		return;
 
 	inode = afs_iget(fc->vnode->vfs_inode.i_sb, fc->key,
-			 newfid, newstatus, newcb, fc->cbi);
+			 newfid, newstatus, newcb, fc->cbi, fc->vnode);
 	if (IS_ERR(inode)) {
 		/* ENOMEM or EINTR at a really inconvenient time - just abandon
 		 * the new directory on the server.
@@ -1194,6 +1243,12 @@ static int afs_rmdir(struct inode *dir, struct dentry *dentry)
 			goto error_key;
 	}
 
+	if (vnode) {
+		ret = down_write_killable(&vnode->rmdir_lock);
+		if (ret < 0)
+			goto error_key;
+	}
+
 	ret = -ERESTARTSYS;
 	if (afs_begin_vnode_operation(&fc, dvnode, key)) {
 		while (afs_select_fileserver(&fc)) {
@@ -1212,6 +1267,8 @@ static int afs_rmdir(struct inode *dir, struct dentry *dentry)
 		}
 	}
 
+	if (vnode)
+		up_write(&vnode->rmdir_lock);
 error_key:
 	key_put(key);
 error:
@@ -1228,9 +1285,9 @@ static int afs_rmdir(struct inode *dir, struct dentry *dentry)
  * 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...
  */
-static int afs_dir_remove_link(struct dentry *dentry, struct key *key,
-			       unsigned long d_version_before,
-			       unsigned long d_version_after)
+int afs_dir_remove_link(struct dentry *dentry, struct key *key,
+			unsigned long d_version_before,
+			unsigned long d_version_after)
 {
 	bool dir_valid;
 	int ret = 0;
@@ -1277,6 +1334,7 @@ static int afs_unlink(struct inode *dir, struct dentry *dentry)
 	struct afs_vnode *dvnode = AFS_FS_I(dir), *vnode = NULL;
 	struct key *key;
 	unsigned long d_version = (unsigned long)dentry->d_fsdata;
+	bool need_rehash = false;
 	u64 data_version = dvnode->status.data_version;
 	int ret;
 
@@ -1300,6 +1358,21 @@ static int afs_unlink(struct inode *dir, struct dentry *dentry)
 			goto error_key;
 	}
 
+	spin_lock(&dentry->d_lock);
+	if (vnode && d_count(dentry) > 1) {
+		spin_unlock(&dentry->d_lock);
+		/* Start asynchronous writeout of the inode */
+		write_inode_now(d_inode(dentry), 0);
+		ret = afs_sillyrename(dvnode, vnode, dentry, key);
+		goto error_key;
+	}
+	if (!d_unhashed(dentry)) {
+		/* Prevent a race with RCU lookup. */
+		__d_drop(dentry);
+		need_rehash = true;
+	}
+	spin_unlock(&dentry->d_lock);
+
 	ret = -ERESTARTSYS;
 	if (afs_begin_vnode_operation(&fc, dvnode, key)) {
 		while (afs_select_fileserver(&fc)) {
@@ -1331,6 +1404,9 @@ static int afs_unlink(struct inode *dir, struct dentry *dentry)
 					    afs_edit_dir_for_unlink);
 	}
 
+	if (need_rehash && ret < 0 && ret != -ENOENT)
+		d_rehash(dentry);
+
 error_key:
 	key_put(key);
 error:
@@ -1551,6 +1627,8 @@ static int afs_rename(struct inode *old_dir, struct dentry *old_dentry,
 {
 	struct afs_fs_cursor fc;
 	struct afs_vnode *orig_dvnode, *new_dvnode, *vnode;
+	struct dentry *tmp = NULL, *rehash = NULL;
+	struct inode *new_inode;
 	struct key *key;
 	u64 orig_data_version, new_data_version;
 	bool new_negative = d_is_negative(new_dentry);
@@ -1559,6 +1637,10 @@ static int afs_rename(struct inode *old_dir, struct dentry *old_dentry,
 	if (flags)
 		return -EINVAL;
 
+	/* Don't allow silly-rename files be moved around. */
+	if (old_dentry->d_flags & DCACHE_NFSFS_RENAMED)
+		return -EINVAL;
+
 	vnode = AFS_FS_I(d_inode(old_dentry));
 	orig_dvnode = AFS_FS_I(old_dir);
 	new_dvnode = AFS_FS_I(new_dir);
@@ -1577,12 +1659,48 @@ static int afs_rename(struct inode *old_dir, struct dentry *old_dentry,
 		goto error;
 	}
 
+	/* For non-directories, check whether the target is busy and if so,
+	 * make a copy of the dentry and then do a silly-rename.  If the
+	 * silly-rename succeeds, the copied dentry is hashed and becomes the
+	 * new target.
+	 */
+	if (d_is_positive(new_dentry) && !d_is_dir(new_dentry)) {
+		/* To prevent any new references to the target during the
+		 * rename, we unhash the dentry in advance.
+		 */
+		if (!d_unhashed(new_dentry)) {
+			d_drop(new_dentry);
+			rehash = new_dentry;
+		}
+
+		if (d_count(new_dentry) > 2) {
+			/* copy the target dentry's name */
+			ret = -ENOMEM;
+			tmp = d_alloc(new_dentry->d_parent,
+				      &new_dentry->d_name);
+			if (!tmp)
+				goto error_rehash;
+
+			ret = afs_sillyrename(new_dvnode,
+					      AFS_FS_I(d_inode(new_dentry)),
+					      new_dentry, key);
+			if (ret)
+				goto error_rehash;
+
+			new_dentry = tmp;
+			rehash = NULL;
+			new_negative = true;
+			orig_data_version = orig_dvnode->status.data_version;
+			new_data_version = new_dvnode->status.data_version;
+		}
+	}
+
 	ret = -ERESTARTSYS;
 	if (afs_begin_vnode_operation(&fc, orig_dvnode, key)) {
 		if (orig_dvnode != new_dvnode) {
 			if (mutex_lock_interruptible_nested(&new_dvnode->io_lock, 1) < 0) {
 				afs_end_vnode_operation(&fc);
-				goto error_key;
+				goto error_rehash;
 			}
 		}
 		while (afs_select_fileserver(&fc)) {
@@ -1599,25 +1717,42 @@ static int afs_rename(struct inode *old_dir, struct dentry *old_dentry,
 			mutex_unlock(&new_dvnode->io_lock);
 		ret = afs_end_vnode_operation(&fc);
 		if (ret < 0)
-			goto error_key;
+			goto error_rehash;
 	}
 
 	if (ret == 0) {
+		if (rehash)
+			d_rehash(rehash);
 		if (test_bit(AFS_VNODE_DIR_VALID, &orig_dvnode->flags))
 		    afs_edit_dir_remove(orig_dvnode, &old_dentry->d_name,
-					afs_edit_dir_for_rename);
+					afs_edit_dir_for_rename_0);
 
 		if (!new_negative &&
 		    test_bit(AFS_VNODE_DIR_VALID, &new_dvnode->flags))
 			afs_edit_dir_remove(new_dvnode, &new_dentry->d_name,
-					    afs_edit_dir_for_rename);
+					    afs_edit_dir_for_rename_1);
 
 		if (test_bit(AFS_VNODE_DIR_VALID, &new_dvnode->flags))
 			afs_edit_dir_add(new_dvnode, &new_dentry->d_name,
-					 &vnode->fid,  afs_edit_dir_for_rename);
+					 &vnode->fid, afs_edit_dir_for_rename_2);
+
+		new_inode = d_inode(new_dentry);
+		if (new_inode) {
+			spin_lock(&new_inode->i_lock);
+			if (new_inode->i_nlink > 0)
+				drop_nlink(new_inode);
+			spin_unlock(&new_inode->i_lock);
+		}
+		d_move(old_dentry, new_dentry);
+		goto error_tmp;
 	}
 
-error_key:
+error_rehash:
+	if (rehash)
+		d_rehash(rehash);
+error_tmp:
+	if (tmp)
+		dput(tmp);
 	key_put(key);
 error:
 	_leave(" = %d", ret);

fs/afs/dir_silly.c

+/* AFS silly rename handling
+ *
+ * Copyright (C) 2019 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ * - Derived from NFS's sillyrename.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+
+#include <linux/kernel.h>
+#include <linux/fs.h>
+#include <linux/namei.h>
+#include <linux/fsnotify.h>
+#include "internal.h"
+
+/*
+ * Actually perform the silly rename step.
+ */
+static int afs_do_silly_rename(struct afs_vnode *dvnode, struct afs_vnode *vnode,
+			       struct dentry *old, struct dentry *new,
+			       struct key *key)
+{
+	struct afs_fs_cursor fc;
+	u64 dir_data_version = dvnode->status.data_version;
+	int ret = -ERESTARTSYS;
+
+	_enter("%pd,%pd", old, new);
+
+	trace_afs_silly_rename(vnode, false);
+	if (afs_begin_vnode_operation(&fc, dvnode, key)) {
+		while (afs_select_fileserver(&fc)) {
+			fc.cb_break = afs_calc_vnode_cb_break(dvnode);
+			afs_fs_rename(&fc, old->d_name.name,
+				      dvnode, new->d_name.name,
+				      dir_data_version, dir_data_version);
+		}
+
+		afs_vnode_commit_status(&fc, dvnode, fc.cb_break);
+		ret = afs_end_vnode_operation(&fc);
+	}
+
+	if (ret == 0) {
+		spin_lock(&old->d_lock);
+		old->d_flags |= DCACHE_NFSFS_RENAMED;
+		spin_unlock(&old->d_lock);
+		if (dvnode->silly_key != key) {
+			key_put(dvnode->silly_key);
+			dvnode->silly_key = key_get(key);
+		}
+
+		if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
+			afs_edit_dir_remove(dvnode, &old->d_name,
+					    afs_edit_dir_for_silly_0);
+		if (test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
+			afs_edit_dir_add(dvnode, &new->d_name,
+					 &vnode->fid, afs_edit_dir_for_silly_1);
+
+		/* vfs_unlink and the like do not issue this when a file is
+		 * sillyrenamed, so do it here.
+		 */
+		fsnotify_nameremove(old, 0);
+	}
+
+	_leave(" = %d", ret);
+	return ret;
+}
+
+/**
+ * afs_sillyrename - Perform a silly-rename of a dentry
+ *
+ * AFS is stateless and the server doesn't know when the client is holding a
+ * file open.  To prevent application problems when a file is unlinked while
+ * it's still open, the client performs a "silly-rename".  That is, it renames
+ * the file to a hidden file in the same directory, and only performs the
+ * unlink once the last reference to it is put.
+ *
+ * The final cleanup is done during dentry_iput.
+ */
+int afs_sillyrename(struct afs_vnode *dvnode, struct afs_vnode *vnode,
+		    struct dentry *dentry, struct key *key)
+{
+	static unsigned int sillycounter;
+	struct dentry *sdentry = NULL;
+	unsigned char silly[16];
+	int ret = -EBUSY;
+
+	_enter("");
+
+	/* We don't allow a dentry to be silly-renamed twice. */
+	if (dentry->d_flags & DCACHE_NFSFS_RENAMED)
+		return -EBUSY;
+
+	sdentry = NULL;
+	do {
+		int slen;
+
+		dput(sdentry);
+		sillycounter++;
+
+		/* Create a silly name.  Note that the ".__afs" prefix is
+		 * understood by the salvager and must not be changed.
+		 */
+		slen = scnprintf(silly, sizeof(silly), ".__afs%04X", sillycounter);
+		sdentry = lookup_one_len(silly, dentry->d_parent, slen);
+
+		/* N.B. Better to return EBUSY here ... it could be dangerous
+		 * to delete the file while it's in use.
+		 */
+		if (IS_ERR(sdentry))
+			goto out;
+	} while (!d_is_negative(sdentry));
+
+	ihold(&vnode->vfs_inode);
+
+	ret = afs_do_silly_rename(dvnode, vnode, dentry, sdentry, key);
+	switch (ret) {
+	case 0:
+		/* The rename succeeded. */
+		d_move(dentry, sdentry);
+		break;
+	case -ERESTARTSYS:
+		/* The result of the rename is unknown. Play it safe by forcing
+		 * a new lookup.
+		 */
+		d_drop(dentry);
+		d_drop(sdentry);
+	}
+
+	iput(&vnode->vfs_inode);
+	dput(sdentry);
+out:
+	_leave(" = %d", ret);
+	return ret;
+}
+
+/*
+ * Tell the server to remove a sillyrename file.
+ */
+static int afs_do_silly_unlink(struct afs_vnode *dvnode, struct afs_vnode *vnode,
+			       struct dentry *dentry, struct key *key)
+{
+	struct afs_fs_cursor fc;
+	u64 dir_data_version = dvnode->status.data_version;
+	int ret = -ERESTARTSYS;
+
+	_enter("");
+
+	trace_afs_silly_rename(vnode, true);
+	if (afs_begin_vnode_operation(&fc, dvnode, key)) {
+		while (afs_select_fileserver(&fc)) {
+			fc.cb_break = afs_calc_vnode_cb_break(dvnode);
+
+			if (test_bit(AFS_SERVER_FL_IS_YFS, &fc.cbi->server->flags) &&
+			    !test_bit(AFS_SERVER_FL_NO_RM2, &fc.cbi->server->flags)) {
+				yfs_fs_remove_file2(&fc, vnode, dentry->d_name.name,
+						    dir_data_version);
+				if (fc.ac.error != -ECONNABORTED ||
+				    fc.ac.abort_code != RXGEN_OPCODE)
+					continue;
+				set_bit(AFS_SERVER_FL_NO_RM2, &fc.cbi->server->flags);
+			}
+
+			afs_fs_remove(&fc, vnode, dentry->d_name.name, false,
+				      dir_data_version);
+		}
+
+		afs_vnode_commit_status(&fc, dvnode, fc.cb_break);
+		ret = afs_end_vnode_operation(&fc);
+		if (ret == 0) {
+			drop_nlink(&vnode->vfs_inode);
+			if (vnode->vfs_inode.i_nlink == 0) {
+				set_bit(AFS_VNODE_DELETED, &vnode->flags);
+				clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags);
+			}
+		}
+		if (ret == 0 &&
+		    test_bit(AFS_VNODE_DIR_VALID, &dvnode->flags))
+			afs_edit_dir_remove(dvnode, &dentry->d_name,
+					    afs_edit_dir_for_unlink);
+	}
+
+	_leave(" = %d", ret);
+	return ret;
+}
+
+/*
+ * Remove sillyrename file on iput.
+ */
+int afs_silly_iput(struct dentry *dentry, struct inode *inode)
+{
+	struct afs_vnode *dvnode = AFS_FS_I(d_inode(dentry->d_parent));
+	struct afs_vnode *vnode = AFS_FS_I(inode);
+	struct dentry *alias;
+	int ret;
+
+	DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq);
+
+	_enter("%p{%pd},%llx", dentry, dentry, vnode->fid.vnode);
+
+	down_read(&dvnode->rmdir_lock);
+
+	alias = d_alloc_parallel(dentry->d_parent, &dentry->d_name, &wq);
+	if (IS_ERR(alias)) {
+		up_read(&dvnode->rmdir_lock);
+		return 0;
+	}
+
+	if (!d_in_lookup(alias)) {
+		/* We raced with lookup...  See if we need to transfer the
+		 * sillyrename information to the aliased dentry.
+		 */
+		ret = 0;
+		spin_lock(&alias->d_lock);
+		if (d_really_is_positive(alias) &&
+		    !(alias->d_flags & DCACHE_NFSFS_RENAMED)) {
+			alias->d_flags |= DCACHE_NFSFS_RENAMED;
+			ret = 1;
+		}
+		spin_unlock(&alias->d_lock);
+		up_read(&dvnode->rmdir_lock);
+		dput(alias);
+		return ret;
+	}
+
+	/* Stop lock-release from complaining. */
+	spin_lock(&vnode->lock);
+	vnode->lock_state = AFS_VNODE_LOCK_DELETED;
+	trace_afs_flock_ev(vnode, NULL, afs_flock_silly_delete, 0);
+	spin_unlock(&vnode->lock);
+
+	afs_do_silly_unlink(dvnode, vnode, dentry, dvnode->silly_key);
+	up_read(&dvnode->rmdir_lock);
+	d_lookup_done(alias);
+	dput(alias);
+	return 1;
+}

fs/afs/fs_probe.c

@@ -141,8 +141,8 @@ static int afs_do_probe_fileserver(struct afs_net *net,
 	struct afs_addr_cursor ac = {
 		.index = 0,
 	};
+	struct afs_call *call;
 	bool in_progress = false;
-	int err;
 
 	_enter("%pU", &server->uuid);
 
@@ -156,12 +156,13 @@ static int afs_do_probe_fileserver(struct afs_net *net,
 	server->probe.rtt = UINT_MAX;
 
 	for (ac.index = 0; ac.index < ac.alist->nr_addrs; ac.index++) {
-		err = afs_fs_get_capabilities(net, server, &ac, key, server_index,
-					      true);
-		if (err == -EINPROGRESS)
+		call = afs_fs_get_capabilities(net, server, &ac, key, server_index);
+		if (!IS_ERR(call)) {
+			afs_put_call(call);
 			in_progress = true;
-		else
-			afs_prioritise_error(_e, err, ac.abort_code);
+		} else {
+			afs_prioritise_error(_e, PTR_ERR(call), ac.abort_code);
+		}
 	}
 
 	if (!in_progress)

fs/afs/inode.c

@@ -29,10 +29,36 @@ static const struct inode_operations afs_symlink_inode_operations = {
 	.listxattr	= afs_listxattr,
 };
 
+static noinline void dump_vnode(struct afs_vnode *vnode, struct afs_vnode *parent_vnode)
+{
+	static unsigned long once_only;
+
+	pr_warn("kAFS: AFS vnode with undefined type %u\n",
+		vnode->status.type);
+	pr_warn("kAFS: A=%d m=%o s=%llx v=%llx\n",
+		vnode->status.abort_code,
+		vnode->status.mode,
+		vnode->status.size,
+		vnode->status.data_version);
+	pr_warn("kAFS: vnode %llx:%llx:%x\n",
+		vnode->fid.vid,
+		vnode->fid.vnode,
+		vnode->fid.unique);
+	if (parent_vnode)
+		pr_warn("kAFS: dir %llx:%llx:%x\n",
+			parent_vnode->fid.vid,
+			parent_vnode->fid.vnode,
+			parent_vnode->fid.unique);
+
+	if (!test_and_set_bit(0, &once_only))
+		dump_stack();
+}
+
 /*
  * Initialise an inode from the vnode status.
  */
-static int afs_inode_init_from_status(struct afs_vnode *vnode, struct key *key)
+static int afs_inode_init_from_status(struct afs_vnode *vnode, struct key *key,
+				      struct afs_vnode *parent_vnode)
 {
 	struct inode *inode = AFS_VNODE_TO_I(vnode);
 
@@ -80,12 +106,16 @@ static int afs_inode_init_from_status(struct afs_vnode *vnode, struct key *key)
 		inode_nohighmem(inode);
 		break;
 	default:
-		printk("kAFS: AFS vnode with undefined type\n");
+		dump_vnode(vnode, parent_vnode);
 		read_sequnlock_excl(&vnode->cb_lock);
 		return afs_protocol_error(NULL, -EBADMSG, afs_eproto_file_type);
 	}
 
-	inode->i_blocks		= 0;
+	/*
+	 * Estimate 512 bytes  blocks used, rounded up to nearest 1K
+	 * for consistency with other AFS clients.
+	 */
+	inode->i_blocks		= ((i_size_read(inode) + 1023) >> 10) << 1;
 	vnode->invalid_before	= vnode->status.data_version;
 
 	read_sequnlock_excl(&vnode->cb_lock);
@@ -270,7 +300,8 @@ static void afs_get_inode_cache(struct afs_vnode *vnode)
  */
 struct inode *afs_iget(struct super_block *sb, struct key *key,
 		       struct afs_fid *fid, struct afs_file_status *status,
-		       struct afs_callback *cb, struct afs_cb_interest *cbi)
+		       struct afs_callback *cb, struct afs_cb_interest *cbi,
+		       struct afs_vnode *parent_vnode)
 {
 	struct afs_iget_data data = { .fid = *fid };
 	struct afs_super_info *as;
@@ -327,7 +358,7 @@ struct inode *afs_iget(struct super_block *sb, struct key *key,
 		vnode->cb_expires_at += ktime_get_real_seconds();
 	}
 
-	ret = afs_inode_init_from_status(vnode, key);
+	ret = afs_inode_init_from_status(vnode, key, parent_vnode);
 	if (ret < 0)
 		goto bad_inode;
 
@@ -543,6 +574,8 @@ void afs_evict_inode(struct inode *inode)
 #endif
 
 	afs_put_permits(rcu_access_pointer(vnode->permit_cache));
+	key_put(vnode->silly_key);
+	vnode->silly_key = NULL;
 	key_put(vnode->lock_key);
 	vnode->lock_key = NULL;
 	_leave("");

fs/afs/internal.h

@@ -36,11 +36,24 @@
 struct pagevec;
 struct afs_call;
 
+/*
+ * Partial file-locking emulation mode.  (The problem being that AFS3 only
+ * allows whole-file locks and no upgrading/downgrading).
+ */
+enum afs_flock_mode {
+	afs_flock_mode_unset,
+	afs_flock_mode_local,	/* Local locking only */
+	afs_flock_mode_openafs,	/* Don't get server lock for a partial lock */
+	afs_flock_mode_strict,	/* Always get a server lock for a partial lock */
+	afs_flock_mode_write,	/* Get an exclusive server lock for a partial lock */
+};
+
 struct afs_fs_context {
 	bool			force;		/* T to force cell type */
 	bool			autocell;	/* T if set auto mount operation */
 	bool			dyn_root;	/* T if dynamic root */
 	bool			no_cell;	/* T if the source is "none" (for dynroot) */
+	enum afs_flock_mode	flock_mode;	/* Partial file-locking emulation mode */
 	afs_voltype_t		type;		/* type of volume requested */
 	unsigned int		volnamesz;	/* size of volume name */
 	const char		*volname;	/* name of volume to mount */
@@ -221,6 +234,7 @@ struct afs_super_info {
 	struct net		*net_ns;	/* Network namespace */
 	struct afs_cell		*cell;		/* The cell in which the volume resides */
 	struct afs_volume	*volume;	/* volume record */
+	enum afs_flock_mode	flock_mode:8;	/* File locking emulation mode */
 	bool			dyn_root;	/* True if dynamic root */
 };
 
@@ -599,6 +613,7 @@ enum afs_lock_state {
 	AFS_VNODE_LOCK_EXTENDING,	/* We're extending a lock on the server */
 	AFS_VNODE_LOCK_NEED_UNLOCK,	/* We need to unlock on the server */
 	AFS_VNODE_LOCK_UNLOCKING,	/* We're telling the server to unlock */
+	AFS_VNODE_LOCK_DELETED,		/* The vnode has been deleted whilst we have a lock */
 };
 
 /*
@@ -620,6 +635,8 @@ struct afs_vnode {
 	struct afs_permits __rcu *permit_cache;	/* cache of permits so far obtained */
 	struct mutex		io_lock;	/* Lock for serialising I/O on this mutex */
 	struct rw_semaphore	validate_lock;	/* lock for validating this vnode */
+	struct rw_semaphore	rmdir_lock;	/* Lock for rmdir vs sillyrename */
+	struct key		*silly_key;	/* Silly rename key */
 	spinlock_t		wb_lock;	/* lock for wb_keys */
 	spinlock_t		lock;		/* waitqueue/flags lock */
 	unsigned long		flags;
@@ -638,6 +655,7 @@ struct afs_vnode {
 	struct list_head	granted_locks;	/* locks granted on this file */
 	struct delayed_work	lock_work;	/* work to be done in locking */
 	struct key		*lock_key;	/* Key to be used in lock ops */
+	ktime_t			locked_at;	/* Time at which lock obtained */
 	enum afs_lock_state	lock_state : 8;
 	afs_lock_type_t		lock_type : 8;
 
@@ -864,6 +882,7 @@ extern const struct address_space_operations afs_dir_aops;
 extern const struct dentry_operations afs_fs_dentry_operations;
 
 extern void afs_d_release(struct dentry *);
+extern int afs_dir_remove_link(struct dentry *, struct key *, unsigned long, unsigned long);
 
 /*
  * dir_edit.c
@@ -872,6 +891,13 @@ extern void afs_edit_dir_add(struct afs_vnode *, struct qstr *, struct afs_fid *
 			     enum afs_edit_dir_reason);
 extern void afs_edit_dir_remove(struct afs_vnode *, struct qstr *, enum afs_edit_dir_reason);
 
+/*
+ * dir_silly.c
+ */
+extern int afs_sillyrename(struct afs_vnode *, struct afs_vnode *,
+			   struct dentry *, struct key *);
+extern int afs_silly_iput(struct dentry *, struct inode *);
+
 /*
  * dynroot.c
  */
@@ -905,6 +931,7 @@ extern void afs_put_read(struct afs_read *);
  */
 extern struct workqueue_struct *afs_lock_manager;
 
+extern void afs_lock_op_done(struct afs_call *);
 extern void afs_lock_work(struct work_struct *);
 extern void afs_lock_may_be_available(struct afs_vnode *);
 extern int afs_lock(struct file *, int, struct file_lock *);
@@ -939,8 +966,9 @@ extern int afs_fs_extend_lock(struct afs_fs_cursor *);
 extern int afs_fs_release_lock(struct afs_fs_cursor *);
 extern int afs_fs_give_up_all_callbacks(struct afs_net *, struct afs_server *,
 					struct afs_addr_cursor *, struct key *);
-extern int afs_fs_get_capabilities(struct afs_net *, struct afs_server *,
-				   struct afs_addr_cursor *, struct key *, unsigned int, bool);
+extern struct afs_call *afs_fs_get_capabilities(struct afs_net *, struct afs_server *,
+						struct afs_addr_cursor *, struct key *,
+						unsigned int);
 extern int afs_fs_inline_bulk_status(struct afs_fs_cursor *, struct afs_net *,
 				     struct afs_fid *, struct afs_file_status *,
 				     struct afs_callback *, unsigned int,
@@ -949,6 +977,14 @@ extern int afs_fs_fetch_status(struct afs_fs_cursor *, struct afs_net *,
 			       struct afs_fid *, struct afs_file_status *,
 			       struct afs_callback *, struct afs_volsync *);
 
+struct afs_acl {
+	u32	size;
+	u8	data[];
+};
+
+extern struct afs_acl *afs_fs_fetch_acl(struct afs_fs_cursor *);
+extern int afs_fs_store_acl(struct afs_fs_cursor *, const struct afs_acl *);
+
 /*
  * fs_probe.c
  */
@@ -965,7 +1001,8 @@ extern struct inode *afs_iget_pseudo_dir(struct super_block *, bool);
 extern struct inode *afs_iget(struct super_block *, struct key *,
 			      struct afs_fid *, struct afs_file_status *,
 			      struct afs_callback *,
-			      struct afs_cb_interest *);
+			      struct afs_cb_interest *,
+			      struct afs_vnode *);
 extern void afs_zap_data(struct afs_vnode *);
 extern int afs_validate(struct afs_vnode *, struct key *);
 extern int afs_getattr(const struct path *, struct kstat *, u32, unsigned int);
@@ -1073,7 +1110,8 @@ extern int __net_init afs_open_socket(struct afs_net *);
 extern void __net_exit afs_close_socket(struct afs_net *);
 extern void afs_charge_preallocation(struct work_struct *);
 extern void afs_put_call(struct afs_call *);
-extern long afs_make_call(struct afs_addr_cursor *, struct afs_call *, gfp_t, bool);
+extern void afs_make_call(struct afs_addr_cursor *, struct afs_call *, gfp_t);
+extern long afs_wait_for_call_to_complete(struct afs_call *, struct afs_addr_cursor *);
 extern struct afs_call *afs_alloc_flat_call(struct afs_net *,
 					    const struct afs_call_type *,
 					    size_t, size_t);
@@ -1218,8 +1256,8 @@ extern void afs_fs_exit(void);
 extern struct afs_vldb_entry *afs_vl_get_entry_by_name_u(struct afs_vl_cursor *,
 							 const char *, int);
 extern struct afs_addr_list *afs_vl_get_addrs_u(struct afs_vl_cursor *, const uuid_t *);
-extern int afs_vl_get_capabilities(struct afs_net *, struct afs_addr_cursor *, struct key *,
-				   struct afs_vlserver *, unsigned int, bool);
+extern struct afs_call *afs_vl_get_capabilities(struct afs_net *, struct afs_addr_cursor *,
+						struct key *, struct afs_vlserver *, unsigned int);
 extern struct afs_addr_list *afs_yfsvl_get_endpoints(struct afs_vl_cursor *, const uuid_t *);
 
 /*
@@ -1333,6 +1371,20 @@ extern int yfs_fs_inline_bulk_status(struct afs_fs_cursor *, struct afs_net *,
 				     struct afs_callback *, unsigned int,
 				     struct afs_volsync *);
 
+struct yfs_acl {
+	struct afs_acl	*acl;		/* Dir/file/symlink ACL */
+	struct afs_acl	*vol_acl;	/* Whole volume ACL */
+	u32		inherit_flag;	/* True if ACL is inherited from parent dir */
+	u32		num_cleaned;	/* Number of ACEs removed due to subject removal */
+	unsigned int	flags;
+#define YFS_ACL_WANT_ACL	0x01	/* Set if caller wants ->acl */
+#define YFS_ACL_WANT_VOL_ACL	0x02	/* Set if caller wants ->vol_acl */
+};
+
+extern void yfs_free_opaque_acl(struct yfs_acl *);
+extern struct yfs_acl *yfs_fs_fetch_opaque_acl(struct afs_fs_cursor *, unsigned int);
+extern int yfs_fs_store_opaque_acl2(struct afs_fs_cursor *, const struct afs_acl *);
+
 /*
  * Miscellaneous inline functions.
  */

fs/afs/protocol_yfs.h

@@ -31,9 +31,9 @@ enum YFS_CM_Operations {
 };
 
 enum YFS_FS_Operations {
-	YFSFETCHACL		= 64131, /* YFS Fetch file ACL */
+	YFSFETCHACL		= 64131, /* YFS Fetch file AFS3 ACL */
 	YFSFETCHSTATUS		= 64132, /* YFS Fetch file status */
-	YFSSTOREACL		= 64134, /* YFS Store file ACL */
+	YFSSTOREACL		= 64134, /* YFS Store file AFS3 ACL */
 	YFSSTORESTATUS		= 64135, /* YFS Store file status */
 	YFSREMOVEFILE		= 64136, /* YFS Remove a file */
 	YFSCREATEFILE		= 64137, /* YFS Create a file */
@@ -49,7 +49,7 @@ enum YFS_FS_Operations {
 	YFSRELEASELOCK		= 64158, /* YFS Release a file lock */
 	YFSLOOKUP		= 64161, /* YFS lookup file in directory */
 	YFSFLUSHCPS		= 64165,
-	YFSFETCHOPAQUEACL	= 64168,
+	YFSFETCHOPAQUEACL	= 64168, /* YFS Fetch file YFS ACL */
 	YFSWHOAMI		= 64170,
 	YFSREMOVEACL		= 64171,
 	YFSREMOVEFILE2		= 64173,

fs/afs/rxrpc.c

@@ -21,7 +21,6 @@
 struct workqueue_struct *afs_async_calls;
 
 static void afs_wake_up_call_waiter(struct sock *, struct rxrpc_call *, unsigned long);
-static long afs_wait_for_call_to_complete(struct afs_call *, struct afs_addr_cursor *);
 static void afs_wake_up_async_call(struct sock *, struct rxrpc_call *, unsigned long);
 static void afs_delete_async_call(struct work_struct *);
 static void afs_process_async_call(struct work_struct *);
@@ -361,10 +360,10 @@ static int afs_send_pages(struct afs_call *call, struct msghdr *msg)
 }
 
 /*
- * initiate a call
+ * Initiate a call and synchronously queue up the parameters for dispatch.  Any
+ * error is stored into the call struct, which the caller must check for.
  */
-long afs_make_call(struct afs_addr_cursor *ac, struct afs_call *call,
-		   gfp_t gfp, bool async)
+void afs_make_call(struct afs_addr_cursor *ac, struct afs_call *call, gfp_t gfp)
 {
 	struct sockaddr_rxrpc *srx = &ac->alist->addrs[ac->index];
 	struct rxrpc_call *rxcall;
@@ -382,7 +381,6 @@ long afs_make_call(struct afs_addr_cursor *ac, struct afs_call *call,
 	       call, call->type->name, key_serial(call->key),
 	       atomic_read(&call->net->nr_outstanding_calls));
 
-	call->async = async;
 	call->addr_ix = ac->index;
 	call->alist = afs_get_addrlist(ac->alist);
 
@@ -415,7 +413,7 @@ long afs_make_call(struct afs_addr_cursor *ac, struct afs_call *call,
 	rxcall = rxrpc_kernel_begin_call(call->net->socket, srx, call->key,
 					 (unsigned long)call,
 					 tx_total_len, gfp,
-					 (async ?
+					 (call->async ?
 					  afs_wake_up_async_call :
 					  afs_wake_up_call_waiter),
 					 call->upgrade,
@@ -453,13 +451,11 @@ long afs_make_call(struct afs_addr_cursor *ac, struct afs_call *call,
 
 	/* Note that at this point, we may have received the reply or an abort
 	 * - and an asynchronous call may already have completed.
+	 *
+	 * afs_wait_for_call_to_complete(call, ac)
+	 * must be called to synchronously clean up.
 	 */
-	if (call->async) {
-		afs_put_call(call);
-		return -EINPROGRESS;
-	}
-
-	return afs_wait_for_call_to_complete(call, ac);
+	return;
 
 error_do_abort:
 	if (ret != -ECONNABORTED) {
@@ -495,9 +491,7 @@ long afs_make_call(struct afs_addr_cursor *ac, struct afs_call *call,
 
 	ac->error = ret;
 	call->state = AFS_CALL_COMPLETE;
-	afs_put_call(call);
 	_leave(" = %d", ret);
-	return ret;
 }
 
 /*
@@ -604,10 +598,10 @@ static void afs_deliver_to_call(struct afs_call *call)
 }
 
 /*
- * wait synchronously for a call to complete
+ * Wait synchronously for a call to complete and clean up the call struct.
  */
-static long afs_wait_for_call_to_complete(struct afs_call *call,
-					  struct afs_addr_cursor *ac)
+long afs_wait_for_call_to_complete(struct afs_call *call,
+				   struct afs_addr_cursor *ac)
 {
 	signed long rtt2, timeout;
 	long ret;
@@ -620,6 +614,10 @@ static long afs_wait_for_call_to_complete(struct afs_call *call,
 
 	_enter("");
 
+	ret = call->error;
+	if (ret < 0)
+		goto out;
+
 	rtt = rxrpc_kernel_get_rtt(call->net->socket, call->rxcall);
 	rtt2 = nsecs_to_jiffies64(rtt) * 2;
 	if (rtt2 < 2)
@@ -703,6 +701,7 @@ static long afs_wait_for_call_to_complete(struct afs_call *call,
 		break;
 	}
 
+out:
 	_debug("call complete");
 	afs_put_call(call);
 	_leave(" = %p", (void *)ret);

fs/afs/super.c

@@ -46,7 +46,7 @@ struct file_system_type afs_fs_type = {
 	.init_fs_context	= afs_init_fs_context,
 	.parameters		= &afs_fs_parameters,
 	.kill_sb		= afs_kill_super,
-	.fs_flags		= 0,
+	.fs_flags		= FS_RENAME_DOES_D_MOVE,
 };
 MODULE_ALIAS_FS("afs");
 
@@ -69,19 +69,30 @@ static atomic_t afs_count_active_inodes;
 enum afs_param {
 	Opt_autocell,
 	Opt_dyn,
+	Opt_flock,
 	Opt_source,
 };
 
 static const struct fs_parameter_spec afs_param_specs[] = {
 	fsparam_flag  ("autocell",	Opt_autocell),
 	fsparam_flag  ("dyn",		Opt_dyn),
+	fsparam_enum  ("flock",		Opt_flock),
 	fsparam_string("source",	Opt_source),
 	{}
 };
 
+static const struct fs_parameter_enum afs_param_enums[] = {
+	{ Opt_flock,	"local",	afs_flock_mode_local },
+	{ Opt_flock,	"openafs",	afs_flock_mode_openafs },
+	{ Opt_flock,	"strict",	afs_flock_mode_strict },
+	{ Opt_flock,	"write",	afs_flock_mode_write },
+	{}
+};
+
 static const struct fs_parameter_description afs_fs_parameters = {
 	.name		= "kAFS",
 	.specs		= afs_param_specs,
+	.enums		= afs_param_enums,
 };
 
 /*
@@ -184,11 +195,22 @@ static int afs_show_devname(struct seq_file *m, struct dentry *root)
 static int afs_show_options(struct seq_file *m, struct dentry *root)
 {
 	struct afs_super_info *as = AFS_FS_S(root->d_sb);
+	const char *p = NULL;
 
 	if (as->dyn_root)
 		seq_puts(m, ",dyn");
 	if (test_bit(AFS_VNODE_AUTOCELL, &AFS_FS_I(d_inode(root))->flags))
 		seq_puts(m, ",autocell");
+	switch (as->flock_mode) {
+	case afs_flock_mode_unset:	break;
+	case afs_flock_mode_local:	p = "local";	break;
+	case afs_flock_mode_openafs:	p = "openafs";	break;
+	case afs_flock_mode_strict:	p = "strict";	break;
+	case afs_flock_mode_write:	p = "write";	break;
+	}
+	if (p)
+		seq_printf(m, ",flock=%s", p);
+
 	return 0;
 }
 
@@ -317,6 +339,10 @@ static int afs_parse_param(struct fs_context *fc, struct fs_parameter *param)
 		ctx->dyn_root = true;
 		break;
 
+	case Opt_flock:
+		ctx->flock_mode = result.uint_32;
+		break;
+
 	default:
 		return -EINVAL;
 	}
@@ -429,7 +455,7 @@ static int afs_fill_super(struct super_block *sb, struct afs_fs_context *ctx)
 		fid.vnode	= 1;
 		fid.vnode_hi	= 0;
 		fid.unique	= 1;
-		inode = afs_iget(sb, ctx->key, &fid, NULL, NULL, NULL);
+		inode = afs_iget(sb, ctx->key, &fid, NULL, NULL, NULL, NULL);
 	}
 
 	if (IS_ERR(inode))
@@ -468,6 +494,7 @@ static struct afs_super_info *afs_alloc_sbi(struct fs_context *fc)
 	as = kzalloc(sizeof(struct afs_super_info), GFP_KERNEL);
 	if (as) {
 		as->net_ns = get_net(fc->net_ns);
+		as->flock_mode = ctx->flock_mode;
 		if (ctx->dyn_root) {
 			as->dyn_root = true;
 		} else {
@@ -552,6 +579,7 @@ static int afs_get_tree(struct fs_context *fc)
 	}
 
 	fc->root = dget(sb->s_root);
+	trace_afs_get_tree(as->cell, as->volume);
 	_leave(" = 0 [%p]", sb);
 	return 0;
 
@@ -658,6 +686,8 @@ static struct inode *afs_alloc_inode(struct super_block *sb)
 	vnode->cb_type		= 0;
 	vnode->lock_state	= AFS_VNODE_LOCK_NONE;
 
+	init_rwsem(&vnode->rmdir_lock);
+
 	_leave(" = %p", &vnode->vfs_inode);
 	return &vnode->vfs_inode;
 }

fs/afs/vl_probe.c

@@ -141,8 +141,8 @@ static bool afs_do_probe_vlserver(struct afs_net *net,
 	struct afs_addr_cursor ac = {
 		.index = 0,
 	};
+	struct afs_call *call;
 	bool in_progress = false;
-	int err;
 
 	_enter("%s", server->name);
 
@@ -156,12 +156,14 @@ static bool afs_do_probe_vlserver(struct afs_net *net,
 	server->probe.rtt = UINT_MAX;
 
 	for (ac.index = 0; ac.index < ac.alist->nr_addrs; ac.index++) {
-		err = afs_vl_get_capabilities(net, &ac, key, server,
-					      server_index, true);
-		if (err == -EINPROGRESS)
+		call = afs_vl_get_capabilities(net, &ac, key, server,
+					       server_index);
+		if (!IS_ERR(call)) {
+			afs_put_call(call);
 			in_progress = true;
-		else
-			afs_prioritise_error(_e, err, ac.abort_code);
+		} else {
+			afs_prioritise_error(_e, PTR_ERR(call), ac.abort_code);
+		}
 	}
 
 	if (!in_progress)

fs/afs/vlclient.c

@@ -167,7 +167,8 @@ struct afs_vldb_entry *afs_vl_get_entry_by_name_u(struct afs_vl_cursor *vc,
 		memset((void *)bp + volnamesz, 0, padsz);
 
 	trace_afs_make_vl_call(call);
-	return (struct afs_vldb_entry *)afs_make_call(&vc->ac, call, GFP_KERNEL, false);
+	afs_make_call(&vc->ac, call, GFP_KERNEL);
+	return (struct afs_vldb_entry *)afs_wait_for_call_to_complete(call, &vc->ac);
 }
 
 /*
@@ -306,7 +307,8 @@ struct afs_addr_list *afs_vl_get_addrs_u(struct afs_vl_cursor *vc,
 		r->uuid.node[i] = htonl(u->node[i]);
 
 	trace_afs_make_vl_call(call);
-	return (struct afs_addr_list *)afs_make_call(&vc->ac, call, GFP_KERNEL, false);
+	afs_make_call(&vc->ac, call, GFP_KERNEL);
+	return (struct afs_addr_list *)afs_wait_for_call_to_complete(call, &vc->ac);
 }
 
 /*
@@ -380,12 +382,11 @@ static const struct afs_call_type afs_RXVLGetCapabilities = {
  * We use this to probe for service upgrade to determine what the server at the
  * other end supports.
  */
-int afs_vl_get_capabilities(struct afs_net *net,
-			    struct afs_addr_cursor *ac,
-			    struct key *key,
-			    struct afs_vlserver *server,
-			    unsigned int server_index,
-			    bool async)
+struct afs_call *afs_vl_get_capabilities(struct afs_net *net,
+					 struct afs_addr_cursor *ac,
+					 struct key *key,
+					 struct afs_vlserver *server,
+					 unsigned int server_index)
 {
 	struct afs_call *call;
 	__be32 *bp;
@@ -394,13 +395,14 @@ int afs_vl_get_capabilities(struct afs_net *net,
 
 	call = afs_alloc_flat_call(net, &afs_RXVLGetCapabilities, 1 * 4, 16 * 4);
 	if (!call)
-		return -ENOMEM;
+		return ERR_PTR(-ENOMEM);
 
 	call->key = key;
 	call->reply[0] = afs_get_vlserver(server);
 	call->reply[1] = (void *)(long)server_index;
 	call->upgrade = true;
 	call->want_reply_time = true;
+	call->async = true;
 
 	/* marshall the parameters */
 	bp = call->request;
@@ -408,7 +410,8 @@ int afs_vl_get_capabilities(struct afs_net *net,
 
 	/* Can't take a ref on server */
 	trace_afs_make_vl_call(call);
-	return afs_make_call(ac, call, GFP_KERNEL, async);
+	afs_make_call(ac, call, GFP_KERNEL);
+	return call;
 }
 
 /*
@@ -651,5 +654,6 @@ struct afs_addr_list *afs_yfsvl_get_endpoints(struct afs_vl_cursor *vc,
 	memcpy(bp, uuid, sizeof(*uuid)); /* Type opr_uuid */
 
 	trace_afs_make_vl_call(call);
-	return (struct afs_addr_list *)afs_make_call(&vc->ac, call, GFP_KERNEL, false);
+	afs_make_call(&vc->ac, call, GFP_KERNEL);
+	return (struct afs_addr_list *)afs_wait_for_call_to_complete(call, &vc->ac);
 }

fs/afs/xattr.c

@@ -16,9 +16,14 @@
 #include "internal.h"
 
 static const char afs_xattr_list[] =
+	"afs.acl\0"
 	"afs.cell\0"
 	"afs.fid\0"
-	"afs.volume";
+	"afs.volume\0"
+	"afs.yfs.acl\0"
+	"afs.yfs.acl_inherited\0"
+	"afs.yfs.acl_num_cleaned\0"
+	"afs.yfs.vol_acl";
 
 /*
  * Retrieve a list of the supported xattrs.
@@ -33,6 +38,248 @@ ssize_t afs_listxattr(struct dentry *dentry, char *buffer, size_t size)
 	return sizeof(afs_xattr_list);
 }
 
+/*
+ * Get a file's ACL.
+ */
+static int afs_xattr_get_acl(const struct xattr_handler *handler,
+			     struct dentry *dentry,
+			     struct inode *inode, const char *name,
+			     void *buffer, size_t size)
+{
+	struct afs_fs_cursor fc;
+	struct afs_vnode *vnode = AFS_FS_I(inode);
+	struct afs_acl *acl = NULL;
+	struct key *key;
+	int ret;
+
+	key = afs_request_key(vnode->volume->cell);
+	if (IS_ERR(key))
+		return PTR_ERR(key);
+
+	ret = -ERESTARTSYS;
+	if (afs_begin_vnode_operation(&fc, vnode, key)) {
+		while (afs_select_fileserver(&fc)) {
+			fc.cb_break = afs_calc_vnode_cb_break(vnode);
+			acl = afs_fs_fetch_acl(&fc);
+		}
+
+		afs_check_for_remote_deletion(&fc, fc.vnode);
+		afs_vnode_commit_status(&fc, vnode, fc.cb_break);
+		ret = afs_end_vnode_operation(&fc);
+	}
+
+	if (ret == 0) {
+		ret = acl->size;
+		if (size > 0) {
+			ret = -ERANGE;
+			if (acl->size > size)
+				return -ERANGE;
+			memcpy(buffer, acl->data, acl->size);
+			ret = acl->size;
+		}
+		kfree(acl);
+	}
+
+	key_put(key);
+	return ret;
+}
+
+/*
+ * Set a file's AFS3 ACL.
+ */
+static int afs_xattr_set_acl(const struct xattr_handler *handler,
+                             struct dentry *dentry,
+                             struct inode *inode, const char *name,
+                             const void *buffer, size_t size, int flags)
+{
+	struct afs_fs_cursor fc;
+	struct afs_vnode *vnode = AFS_FS_I(inode);
+	struct afs_acl *acl = NULL;
+	struct key *key;
+	int ret;
+
+	if (flags == XATTR_CREATE)
+		return -EINVAL;
+
+	key = afs_request_key(vnode->volume->cell);
+	if (IS_ERR(key))
+		return PTR_ERR(key);
+
+	acl = kmalloc(sizeof(*acl) + size, GFP_KERNEL);
+	if (!acl) {
+		key_put(key);
+		return -ENOMEM;
+	}
+
+	acl->size = size;
+	memcpy(acl->data, buffer, size);
+
+	ret = -ERESTARTSYS;
+	if (afs_begin_vnode_operation(&fc, vnode, key)) {
+		while (afs_select_fileserver(&fc)) {
+			fc.cb_break = afs_calc_vnode_cb_break(vnode);
+			afs_fs_store_acl(&fc, acl);
+		}
+
+		afs_check_for_remote_deletion(&fc, fc.vnode);
+		afs_vnode_commit_status(&fc, vnode, fc.cb_break);
+		ret = afs_end_vnode_operation(&fc);
+	}
+
+	kfree(acl);
+	key_put(key);
+	return ret;
+}
+
+static const struct xattr_handler afs_xattr_afs_acl_handler = {
+	.name   = "afs.acl",
+	.get    = afs_xattr_get_acl,
+	.set    = afs_xattr_set_acl,
+};
+
+/*
+ * Get a file's YFS ACL.
+ */
+static int afs_xattr_get_yfs(const struct xattr_handler *handler,
+			     struct dentry *dentry,
+			     struct inode *inode, const char *name,
+			     void *buffer, size_t size)
+{
+	struct afs_fs_cursor fc;
+	struct afs_vnode *vnode = AFS_FS_I(inode);
+	struct yfs_acl *yacl = NULL;
+	struct key *key;
+	unsigned int flags = 0;
+	char buf[16], *data;
+	int which = 0, dsize, ret;
+
+	if (strcmp(name, "acl") == 0)
+		which = 0;
+	else if (strcmp(name, "acl_inherited") == 0)
+		which = 1;
+	else if (strcmp(name, "acl_num_cleaned") == 0)
+		which = 2;
+	else if (strcmp(name, "vol_acl") == 0)
+		which = 3;
+	else
+		return -EOPNOTSUPP;
+
+	if (which == 0)
+		flags |= YFS_ACL_WANT_ACL;
+	else if (which == 3)
+		flags |= YFS_ACL_WANT_VOL_ACL;
+
+	key = afs_request_key(vnode->volume->cell);
+	if (IS_ERR(key))
+		return PTR_ERR(key);
+
+	ret = -ERESTARTSYS;
+	if (afs_begin_vnode_operation(&fc, vnode, key)) {
+		while (afs_select_fileserver(&fc)) {
+			fc.cb_break = afs_calc_vnode_cb_break(vnode);
+			yacl = yfs_fs_fetch_opaque_acl(&fc, flags);
+		}
+
+		afs_check_for_remote_deletion(&fc, fc.vnode);
+		afs_vnode_commit_status(&fc, vnode, fc.cb_break);
+		ret = afs_end_vnode_operation(&fc);
+	}
+
+	if (ret == 0) {
+		switch (which) {
+		case 0:
+			data = yacl->acl->data;
+			dsize = yacl->acl->size;
+			break;
+		case 1:
+			data = buf;
+			dsize = snprintf(buf, sizeof(buf), "%u",
+					 yacl->inherit_flag);
+			break;
+		case 2:
+			data = buf;
+			dsize = snprintf(buf, sizeof(buf), "%u",
+					 yacl->num_cleaned);
+			break;
+		case 3:
+			data = yacl->vol_acl->data;
+			dsize = yacl->vol_acl->size;
+			break;
+		default:
+			ret = -EOPNOTSUPP;
+			goto out;
+		}
+
+		ret = dsize;
+		if (size > 0) {
+			if (dsize > size) {
+				ret = -ERANGE;
+				goto out;
+			}
+			memcpy(buffer, data, dsize);
+		}
+	}
+
+out:
+	yfs_free_opaque_acl(yacl);
+	key_put(key);
+	return ret;
+}
+
+/*
+ * Set a file's YFS ACL.
+ */
+static int afs_xattr_set_yfs(const struct xattr_handler *handler,
+                             struct dentry *dentry,
+                             struct inode *inode, const char *name,
+                             const void *buffer, size_t size, int flags)
+{
+	struct afs_fs_cursor fc;
+	struct afs_vnode *vnode = AFS_FS_I(inode);
+	struct afs_acl *acl = NULL;
+	struct key *key;
+	int ret;
+
+	if (flags == XATTR_CREATE ||
+	    strcmp(name, "acl") != 0)
+		return -EINVAL;
+
+	key = afs_request_key(vnode->volume->cell);
+	if (IS_ERR(key))
+		return PTR_ERR(key);
+
+	acl = kmalloc(sizeof(*acl) + size, GFP_KERNEL);
+	if (!acl) {
+		key_put(key);
+		return -ENOMEM;
+	}
+
+	acl->size = size;
+	memcpy(acl->data, buffer, size);
+
+	ret = -ERESTARTSYS;
+	if (afs_begin_vnode_operation(&fc, vnode, key)) {
+		while (afs_select_fileserver(&fc)) {
+			fc.cb_break = afs_calc_vnode_cb_break(vnode);
+			yfs_fs_store_opaque_acl2(&fc, acl);
+		}
+
+		afs_check_for_remote_deletion(&fc, fc.vnode);
+		afs_vnode_commit_status(&fc, vnode, fc.cb_break);
+		ret = afs_end_vnode_operation(&fc);
+	}
+
+	kfree(acl);
+	key_put(key);
+	return ret;
+}
+
+static const struct xattr_handler afs_xattr_yfs_handler = {
+	.prefix	= "afs.yfs.",
+	.get	= afs_xattr_get_yfs,
+	.set	= afs_xattr_set_yfs,
+};
+
 /*
  * Get the name of the cell on which a file resides.
  */
@@ -50,7 +297,7 @@ static int afs_xattr_get_cell(const struct xattr_handler *handler,
 		return namelen;
 	if (namelen > size)
 		return -ERANGE;
-	memcpy(buffer, cell->name, size);
+	memcpy(buffer, cell->name, namelen);
 	return namelen;
 }
 
@@ -69,11 +316,20 @@ static int afs_xattr_get_fid(const struct xattr_handler *handler,
 			     void *buffer, size_t size)
 {
 	struct afs_vnode *vnode = AFS_FS_I(inode);
-	char text[8 + 1 + 8 + 1 + 8 + 1];
+	char text[16 + 1 + 24 + 1 + 8 + 1];
 	size_t len;
 
-	len = sprintf(text, "%llx:%llx:%x",
-		      vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique);
+	/* The volume ID is 64-bit, the vnode ID is 96-bit and the
+	 * uniquifier is 32-bit.
+	 */
+	len = sprintf(text, "%llx:", vnode->fid.vid);
+	if (vnode->fid.vnode_hi)
+		len += sprintf(text + len, "%x%016llx",
+			       vnode->fid.vnode_hi, vnode->fid.vnode);
+	else
+		len += sprintf(text + len, "%llx", vnode->fid.vnode);
+	len += sprintf(text + len, ":%x", vnode->fid.unique);
+
 	if (size == 0)
 		return len;
 	if (len > size)
@@ -104,7 +360,7 @@ static int afs_xattr_get_volume(const struct xattr_handler *handler,
 		return namelen;
 	if (namelen > size)
 		return -ERANGE;
-	memcpy(buffer, volname, size);
+	memcpy(buffer, volname, namelen);
 	return namelen;
 }
 
@@ -114,8 +370,10 @@ static const struct xattr_handler afs_xattr_afs_volume_handler = {
 };
 
 const struct xattr_handler *afs_xattr_handlers[] = {
+	&afs_xattr_afs_acl_handler,
 	&afs_xattr_afs_cell_handler,
 	&afs_xattr_afs_fid_handler,
 	&afs_xattr_afs_volume_handler,
+	&afs_xattr_yfs_handler,		/* afs.yfs. prefix */
 	NULL
 };

include/linux/fs.h

@@ -1098,6 +1098,7 @@ struct file_lock {
 		struct {
 			struct list_head link;	/* link in AFS vnode's pending_locks list */
 			int state;		/* state of grant or error if -ve */
+			unsigned int	debug_id;
 		} afs;
 	} fl_u;
 } __randomize_layout;