Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6: (107 commits)
  vfs: use ERR_CAST for err-ptr tossing in lookup_instantiate_filp
  isofs: Remove global fs lock
  jffs2: fix IN_DELETE_SELF on overwriting rename() killing a directory
  fix IN_DELETE_SELF on overwriting rename() on ramfs et.al.
  mm/truncate.c: fix build for CONFIG_BLOCK not enabled
  fs:update the NOTE of the file_operations structure
  Remove dead code in dget_parent()
  AFS: Fix silly characters in a comment
  switch d_add_ci() to d_splice_alias() in "found negative" case as well
  simplify gfs2_lookup()
  jfs_lookup(): don't bother with . or ..
  get rid of useless dget_parent() in btrfs rename() and link()
  get rid of useless dget_parent() in fs/btrfs/ioctl.c
  fs: push i_mutex and filemap_write_and_wait down into ->fsync() handlers
  drivers: fix up various ->llseek() implementations
  fs: handle SEEK_HOLE/SEEK_DATA properly in all fs's that define their own llseek
  Ext4: handle SEEK_HOLE/SEEK_DATA generically
  Btrfs: implement our own ->llseek
  fs: add SEEK_HOLE and SEEK_DATA flags
  reiserfs: make reiserfs default to barrier=flush
  ...

Fix up trivial conflicts in fs/xfs/linux-2.6/xfs_super.c due to the new
shrinker callout for the inode cache, that clashed with the xfs code to
start the periodic workers later.

13 files changed, 259 insertions, 175 deletions

diff --git a/drivers/base/devtmpfs.c b/drivers/base/devtmpfs.c
index 82bbb5967aa..6d678c99512 100644
--- a/drivers/base/devtmpfs.c
+++ b/drivers/base/devtmpfs.c
@@ -21,12 +21,11 @@
 #include <linux/fs.h>
 #include <linux/shmem_fs.h>
 #include <linux/ramfs.h>
-#include <linux/cred.h>
 #include <linux/sched.h>
-#include <linux/init_task.h>
 #include <linux/slab.h>
+#include <linux/kthread.h>
 
-static struct vfsmount *dev_mnt;
+static struct task_struct *thread;
 
 #if defined CONFIG_DEVTMPFS_MOUNT
 static int mount_dev = 1;
@@ -34,7 +33,16 @@ static int mount_dev = 1;
 static int mount_dev;
 #endif
 
-static DEFINE_MUTEX(dirlock);
+static DEFINE_SPINLOCK(req_lock);
+
+static struct req {
+	struct req *next;
+	struct completion done;
+	int err;
+	const char *name;
+	mode_t mode;	/* 0 => delete */
+	struct device *dev;
+} *requests;
 
 static int __init mount_param(char *str)
 {
@@ -68,131 +76,152 @@ static inline int is_blockdev(struct device *dev)
 static inline int is_blockdev(struct device *dev) { return 0; }
 #endif
 
+int devtmpfs_create_node(struct device *dev)
+{
+	const char *tmp = NULL;
+	struct req req;
+
+	if (!thread)
+		return 0;
+
+	req.mode = 0;
+	req.name = device_get_devnode(dev, &req.mode, &tmp);
+	if (!req.name)
+		return -ENOMEM;
+
+	if (req.mode == 0)
+		req.mode = 0600;
+	if (is_blockdev(dev))
+		req.mode |= S_IFBLK;
+	else
+		req.mode |= S_IFCHR;
+
+	req.dev = dev;
+
+	init_completion(&req.done);
+
+	spin_lock(&req_lock);
+	req.next = requests;
+	requests = &req;
+	spin_unlock(&req_lock);
+
+	wake_up_process(thread);
+	wait_for_completion(&req.done);
+
+	kfree(tmp);
+
+	return req.err;
+}
+
+int devtmpfs_delete_node(struct device *dev)
+{
+	const char *tmp = NULL;
+	struct req req;
+
+	if (!thread)
+		return 0;
+
+	req.name = device_get_devnode(dev, NULL, &tmp);
+	if (!req.name)
+		return -ENOMEM;
+
+	req.mode = 0;
+	req.dev = dev;
+
+	init_completion(&req.done);
+
+	spin_lock(&req_lock);
+	req.next = requests;
+	requests = &req;
+	spin_unlock(&req_lock);
+
+	wake_up_process(thread);
+	wait_for_completion(&req.done);
+
+	kfree(tmp);
+	return req.err;
+}
+
 static int dev_mkdir(const char *name, mode_t mode)
 {
-	struct nameidata nd;
 	struct dentry *dentry;
+	struct path path;
 	int err;
 
-	err = vfs_path_lookup(dev_mnt->mnt_root, dev_mnt,
-			      name, LOOKUP_PARENT, &nd);
-	if (err)
-		return err;
-
-	dentry = lookup_create(&nd, 1);
-	if (!IS_ERR(dentry)) {
-		err = vfs_mkdir(nd.path.dentry->d_inode, dentry, mode);
-		if (!err)
-			/* mark as kernel-created inode */
-			dentry->d_inode->i_private = &dev_mnt;
-		dput(dentry);
-	} else {
-		err = PTR_ERR(dentry);
-	}
-
-	mutex_unlock(&nd.path.dentry->d_inode->i_mutex);
-	path_put(&nd.path);
+	dentry = kern_path_create(AT_FDCWD, name, &path, 1);
+	if (IS_ERR(dentry))
+		return PTR_ERR(dentry);
+
+	err = vfs_mkdir(path.dentry->d_inode, dentry, mode);
+	if (!err)
+		/* mark as kernel-created inode */
+		dentry->d_inode->i_private = &thread;
+	dput(dentry);
+	mutex_unlock(&path.dentry->d_inode->i_mutex);
+	path_put(&path);
 	return err;
 }
 
 static int create_path(const char *nodepath)
 {
+	char *path;
+	char *s;
 	int err;
 
-	mutex_lock(&dirlock);
-	err = dev_mkdir(nodepath, 0755);
-	if (err == -ENOENT) {
-		char *path;
-		char *s;
-
-		/* parent directories do not exist, create them */
-		path = kstrdup(nodepath, GFP_KERNEL);
-		if (!path) {
-			err = -ENOMEM;
-			goto out;
-		}
-		s = path;
-		for (;;) {
-			s = strchr(s, '/');
-			if (!s)
-				break;
-			s[0] = '\0';
-			err = dev_mkdir(path, 0755);
-			if (err && err != -EEXIST)
-				break;
-			s[0] = '/';
-			s++;
-		}
-		kfree(path);
+	/* parent directories do not exist, create them */
+	path = kstrdup(nodepath, GFP_KERNEL);
+	if (!path)
+		return -ENOMEM;
+
+	s = path;
+	for (;;) {
+		s = strchr(s, '/');
+		if (!s)
+			break;
+		s[0] = '\0';
+		err = dev_mkdir(path, 0755);
+		if (err && err != -EEXIST)
+			break;
+		s[0] = '/';
+		s++;
 	}
-out:
-	mutex_unlock(&dirlock);
+	kfree(path);
 	return err;
 }
 
-int devtmpfs_create_node(struct device *dev)
+static int handle_create(const char *nodename, mode_t mode, struct device *dev)
 {
-	const char *tmp = NULL;
-	const char *nodename;
-	const struct cred *curr_cred;
-	mode_t mode = 0;
-	struct nameidata nd;
 	struct dentry *dentry;
+	struct path path;
 	int err;
 
-	if (!dev_mnt)
-		return 0;
-
-	nodename = device_get_devnode(dev, &mode, &tmp);
-	if (!nodename)
-		return -ENOMEM;
-
-	if (mode == 0)
-		mode = 0600;
-	if (is_blockdev(dev))
-		mode |= S_IFBLK;
-	else
-		mode |= S_IFCHR;
-
-	curr_cred = override_creds(&init_cred);
-
-	err = vfs_path_lookup(dev_mnt->mnt_root, dev_mnt,
-			      nodename, LOOKUP_PARENT, &nd);
-	if (err == -ENOENT) {
+	dentry = kern_path_create(AT_FDCWD, nodename, &path, 0);
+	if (dentry == ERR_PTR(-ENOENT)) {
 		create_path(nodename);
-		err = vfs_path_lookup(dev_mnt->mnt_root, dev_mnt,
-				      nodename, LOOKUP_PARENT, &nd);
+		dentry = kern_path_create(AT_FDCWD, nodename, &path, 0);
 	}
-	if (err)
-		goto out;
-
-	dentry = lookup_create(&nd, 0);
-	if (!IS_ERR(dentry)) {
-		err = vfs_mknod(nd.path.dentry->d_inode,
-				dentry, mode, dev->devt);
-		if (!err) {
-			struct iattr newattrs;
-
-			/* fixup possibly umasked mode */
-			newattrs.ia_mode = mode;
-			newattrs.ia_valid = ATTR_MODE;
-			mutex_lock(&dentry->d_inode->i_mutex);
-			notify_change(dentry, &newattrs);
-			mutex_unlock(&dentry->d_inode->i_mutex);
-
-			/* mark as kernel-created inode */
-			dentry->d_inode->i_private = &dev_mnt;
-		}
-		dput(dentry);
-	} else {
-		err = PTR_ERR(dentry);
+	if (IS_ERR(dentry))
+		return PTR_ERR(dentry);
+
+	err = vfs_mknod(path.dentry->d_inode,
+			dentry, mode, dev->devt);
+	if (!err) {
+		struct iattr newattrs;
+
+		/* fixup possibly umasked mode */
+		newattrs.ia_mode = mode;
+		newattrs.ia_valid = ATTR_MODE;
+		mutex_lock(&dentry->d_inode->i_mutex);
+		notify_change(dentry, &newattrs);
+		mutex_unlock(&dentry->d_inode->i_mutex);
+
+		/* mark as kernel-created inode */
+		dentry->d_inode->i_private = &thread;
 	}
+	dput(dentry);
 
-	mutex_unlock(&nd.path.dentry->d_inode->i_mutex);
-	path_put(&nd.path);
-out:
-	kfree(tmp);
-	revert_creds(curr_cred);
+	mutex_unlock(&path.dentry->d_inode->i_mutex);
+	path_put(&path);
 	return err;
 }
 
@@ -202,8 +231,7 @@ static int dev_rmdir(const char *name)
 	struct dentry *dentry;
 	int err;
 
-	err = vfs_path_lookup(dev_mnt->mnt_root, dev_mnt,
-			      name, LOOKUP_PARENT, &nd);
+	err = kern_path_parent(name, &nd);
 	if (err)
 		return err;
 
@@ -211,7 +239,7 @@ static int dev_rmdir(const char *name)
 	dentry = lookup_one_len(nd.last.name, nd.path.dentry, nd.last.len);
 	if (!IS_ERR(dentry)) {
 		if (dentry->d_inode) {
-			if (dentry->d_inode->i_private == &dev_mnt)
+			if (dentry->d_inode->i_private == &thread)
 				err = vfs_rmdir(nd.path.dentry->d_inode,
 						dentry);
 			else
@@ -238,7 +266,6 @@ static int delete_path(const char *nodepath)
 	if (!path)
 		return -ENOMEM;
 
-	mutex_lock(&dirlock);
 	for (;;) {
 		char *base;
 
@@ -250,7 +277,6 @@ static int delete_path(const char *nodepath)
 		if (err)
 			break;
 	}
-	mutex_unlock(&dirlock);
 
 	kfree(path);
 	return err;
@@ -259,7 +285,7 @@ static int delete_path(const char *nodepath)
 static int dev_mynode(struct device *dev, struct inode *inode, struct kstat *stat)
 {
 	/* did we create it */
-	if (inode->i_private != &dev_mnt)
+	if (inode->i_private != &thread)
 		return 0;
 
 	/* does the dev_t match */
@@ -277,29 +303,17 @@ static int dev_mynode(struct device *dev, struct inode *inode, struct kstat *sta
 	return 1;
 }
 
-int devtmpfs_delete_node(struct device *dev)
+static int handle_remove(const char *nodename, struct device *dev)
 {
-	const char *tmp = NULL;
-	const char *nodename;
-	const struct cred *curr_cred;
 	struct nameidata nd;
 	struct dentry *dentry;
 	struct kstat stat;
 	int deleted = 1;
 	int err;
 
-	if (!dev_mnt)
-		return 0;
-
-	nodename = device_get_devnode(dev, NULL, &tmp);
-	if (!nodename)
-		return -ENOMEM;
-
-	curr_cred = override_creds(&init_cred);
-	err = vfs_path_lookup(dev_mnt->mnt_root, dev_mnt,
-			      nodename, LOOKUP_PARENT, &nd);
+	err = kern_path_parent(nodename, &nd);
 	if (err)
-		goto out;
+		return err;
 
 	mutex_lock_nested(&nd.path.dentry->d_inode->i_mutex, I_MUTEX_PARENT);
 	dentry = lookup_one_len(nd.last.name, nd.path.dentry, nd.last.len);
@@ -337,9 +351,6 @@ int devtmpfs_delete_node(struct device *dev)
 	path_put(&nd.path);
 	if (deleted && strchr(nodename, '/'))
 		delete_path(nodename);
-out:
-	kfree(tmp);
-	revert_creds(curr_cred);
 	return err;
 }
 
@@ -354,7 +365,7 @@ int devtmpfs_mount(const char *mntdir)
 	if (!mount_dev)
 		return 0;
 
-	if (!dev_mnt)
+	if (!thread)
 		return 0;
 
 	err = sys_mount("devtmpfs", (char *)mntdir, "devtmpfs", MS_SILENT, NULL);
@@ -365,31 +376,79 @@ int devtmpfs_mount(const char *mntdir)
 	return err;
 }
 
+static __initdata DECLARE_COMPLETION(setup_done);
+
+static int handle(const char *name, mode_t mode, struct device *dev)
+{
+	if (mode)
+		return handle_create(name, mode, dev);
+	else
+		return handle_remove(name, dev);
+}
+
+static int devtmpfsd(void *p)
+{
+	char options[] = "mode=0755";
+	int *err = p;
+	*err = sys_unshare(CLONE_NEWNS);
+	if (*err)
+		goto out;
+	*err = sys_mount("devtmpfs", "/", "devtmpfs", MS_SILENT, options);
+	if (*err)
+		goto out;
+	sys_chdir("/.."); /* will traverse into overmounted root */
+	sys_chroot(".");
+	complete(&setup_done);
+	while (1) {
+		spin_lock(&req_lock);
+		while (requests) {
+			struct req *req = requests;
+			requests = NULL;
+			spin_unlock(&req_lock);
+			while (req) {
+				req->err = handle(req->name, req->mode, req->dev);
+				complete(&req->done);
+				req = req->next;
+			}
+			spin_lock(&req_lock);
+		}
+		set_current_state(TASK_INTERRUPTIBLE);
+		spin_unlock(&req_lock);
+		schedule();
+		__set_current_state(TASK_RUNNING);
+	}
+	return 0;
+out:
+	complete(&setup_done);
+	return *err;
+}
+
 /*
  * Create devtmpfs instance, driver-core devices will add their device
  * nodes here.
  */
 int __init devtmpfs_init(void)
 {
-	int err;
-	struct vfsmount *mnt;
-	char options[] = "mode=0755";
-
-	err = register_filesystem(&dev_fs_type);
+	int err = register_filesystem(&dev_fs_type);
 	if (err) {
 		printk(KERN_ERR "devtmpfs: unable to register devtmpfs "
 		       "type %i\n", err);
 		return err;
 	}
 
-	mnt = kern_mount_data(&dev_fs_type, options);
-	if (IS_ERR(mnt)) {
-		err = PTR_ERR(mnt);
+	thread = kthread_run(devtmpfsd, &err, "kdevtmpfs");
+	if (!IS_ERR(thread)) {
+		wait_for_completion(&setup_done);
+	} else {
+		err = PTR_ERR(thread);
+		thread = NULL;
+	}
+
+	if (err) {
 		printk(KERN_ERR "devtmpfs: unable to create devtmpfs %i\n", err);
 		unregister_filesystem(&dev_fs_type);
 		return err;
 	}
-	dev_mnt = mnt;
 
 	printk(KERN_INFO "devtmpfs: initialized\n");
 	return 0;
diff --git a/drivers/block/pktcdvd.c b/drivers/block/pktcdvd.c
index 07a382eaf0a..e133f094ab0 100644
--- a/drivers/block/pktcdvd.c
+++ b/drivers/block/pktcdvd.c
@@ -1206,7 +1206,7 @@ static int pkt_start_recovery(struct packet_data *pkt)
 	if (!sb)
 		return 0;
 
-	if (!sb->s_op || !sb->s_op->relocate_blocks)
+	if (!sb->s_op->relocate_blocks)
 		goto out;
 
 	old_block = pkt->sector / (CD_FRAMESIZE >> 9);
diff --git a/drivers/char/generic_nvram.c b/drivers/char/generic_nvram.c
index 0e941b57482..6c4f4b5a9dd 100644
--- a/drivers/char/generic_nvram.c
+++ b/drivers/char/generic_nvram.c
@@ -34,12 +34,16 @@ static ssize_t nvram_len;
 static loff_t nvram_llseek(struct file *file, loff_t offset, int origin)
 {
 	switch (origin) {
+	case 0:
+		break;
 	case 1:
 		offset += file->f_pos;
 		break;
 	case 2:
 		offset += nvram_len;
 		break;
+	default:
+		offset = -1;
 	}
 	if (offset < 0)
 		return -EINVAL;
diff --git a/drivers/char/nvram.c b/drivers/char/nvram.c
index 166f1e7aaa7..da3cfee782d 100644
--- a/drivers/char/nvram.c
+++ b/drivers/char/nvram.c
@@ -224,6 +224,8 @@ static loff_t nvram_llseek(struct file *file, loff_t offset, int origin)
 	case 2:
 		offset += NVRAM_BYTES;
 		break;
+	default:
+		return -EINVAL;
 	}
 
 	return (offset >= 0) ? (file->f_pos = offset) : -EINVAL;
diff --git a/drivers/char/ps3flash.c b/drivers/char/ps3flash.c
index 85c004a518e..d0c57c2e290 100644
--- a/drivers/char/ps3flash.c
+++ b/drivers/char/ps3flash.c
@@ -101,12 +101,16 @@ static loff_t ps3flash_llseek(struct file *file, loff_t offset, int origin)
 
 	mutex_lock(&file->f_mapping->host->i_mutex);
 	switch (origin) {
+	case 0:
+		break;
 	case 1:
 		offset += file->f_pos;
 		break;
 	case 2:
 		offset += dev->regions[dev->region_idx].size*dev->blk_size;
 		break;
+	default:
+		offset = -1;
 	}
 	if (offset < 0) {
 		res = -EINVAL;
@@ -305,9 +309,14 @@ static int ps3flash_flush(struct file *file, fl_owner_t id)
 	return ps3flash_writeback(ps3flash_dev);
 }
 
-static int ps3flash_fsync(struct file *file, int datasync)
+static int ps3flash_fsync(struct file *file, loff_t start, loff_t end, int datasync)
 {
-	return ps3flash_writeback(ps3flash_dev);
+	struct inode *inode = file->f_path.dentry->d_inode;
+	int err;
+	mutex_lock(&inode->i_mutex);
+	err = ps3flash_writeback(ps3flash_dev);
+	mutex_unlock(&inode->i_mutex);
+	return err;
 }
 
 static irqreturn_t ps3flash_interrupt(int irq, void *data)
diff --git a/drivers/macintosh/nvram.c b/drivers/macintosh/nvram.c
index a271c8218d8..f0e03e7937e 100644
--- a/drivers/macintosh/nvram.c
+++ b/drivers/macintosh/nvram.c
@@ -21,12 +21,16 @@
 static loff_t nvram_llseek(struct file *file, loff_t offset, int origin)
 {
 	switch (origin) {
+	case 0:
+		break;
 	case 1:
 		offset += file->f_pos;
 		break;
 	case 2:
 		offset += NVRAM_SIZE;
 		break;
+	default:
+		offset = -1;
 	}
 	if (offset < 0)
 		return -EINVAL;
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 91e31e260b4..dfc9425db70 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -6394,16 +6394,11 @@ static void md_seq_stop(struct seq_file *seq, void *v)
 		mddev_put(mddev);
 }
 
-struct mdstat_info {
-	int event;
-};
-
 static int md_seq_show(struct seq_file *seq, void *v)
 {
 	mddev_t *mddev = v;
 	sector_t sectors;
 	mdk_rdev_t *rdev;
-	struct mdstat_info *mi = seq->private;
 	struct bitmap *bitmap;
 
 	if (v == (void*)1) {
@@ -6415,7 +6410,7 @@ static int md_seq_show(struct seq_file *seq, void *v)
 
 		spin_unlock(&pers_lock);
 		seq_printf(seq, "\n");
-		mi->event = atomic_read(&md_event_count);
+		seq->poll_event = atomic_read(&md_event_count);
 		return 0;
 	}
 	if (v == (void*)2) {
@@ -6527,26 +6522,21 @@ static const struct seq_operations md_seq_ops = {
 
 static int md_seq_open(struct inode *inode, struct file *file)
 {
+	struct seq_file *seq;
 	int error;
-	struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL);
-	if (mi == NULL)
-		return -ENOMEM;
 
 	error = seq_open(file, &md_seq_ops);
 	if (error)
-		kfree(mi);
-	else {
-		struct seq_file *p = file->private_data;
-		p->private = mi;
-		mi->event = atomic_read(&md_event_count);
-	}
+		return error;
+
+	seq = file->private_data;
+	seq->poll_event = atomic_read(&md_event_count);
 	return error;
 }
 
 static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
 {
-	struct seq_file *m = filp->private_data;
-	struct mdstat_info *mi = m->private;
+	struct seq_file *seq = filp->private_data;
 	int mask;
 
 	poll_wait(filp, &md_event_waiters, wait);
@@ -6554,7 +6544,7 @@ static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
 	/* always allow read */
 	mask = POLLIN | POLLRDNORM;
 
-	if (mi->event != atomic_read(&md_event_count))
+	if (seq->poll_event != atomic_read(&md_event_count))
 		mask |= POLLERR | POLLPRI;
 	return mask;
 }
diff --git a/drivers/mtd/ubi/cdev.c b/drivers/mtd/ubi/cdev.c
index 191f3bb3c41..3320a50ba4f 100644
--- a/drivers/mtd/ubi/cdev.c
+++ b/drivers/mtd/ubi/cdev.c
@@ -189,12 +189,16 @@ static loff_t vol_cdev_llseek(struct file *file, loff_t offset, int origin)
 	return new_offset;
 }
 
-static int vol_cdev_fsync(struct file *file, int datasync)
+static int vol_cdev_fsync(struct file *file, loff_t start, loff_t end, int datasync)
 {
 	struct ubi_volume_desc *desc = file->private_data;
 	struct ubi_device *ubi = desc->vol->ubi;
-
-	return ubi_sync(ubi->ubi_num);
+	struct inode *inode = file->f_path.dentry->d_inode;
+	int err;
+	mutex_lock(&inode->i_mutex);
+	err = ubi_sync(ubi->ubi_num);
+	mutex_unlock(&inode->i_mutex);
+	return err;
 }
 
 
diff --git a/drivers/sh/clk/core.c b/drivers/sh/clk/core.c
index 7e9c39951ec..d6702e57d42 100644
--- a/drivers/sh/clk/core.c
+++ b/drivers/sh/clk/core.c
@@ -670,7 +670,7 @@ static struct dentry *clk_debugfs_root;
 static int clk_debugfs_register_one(struct clk *c)
 {
 	int err;
-	struct dentry *d, *child, *child_tmp;
+	struct dentry *d;
 	struct clk *pa = c->parent;
 	char s[255];
 	char *p = s;
@@ -699,10 +699,7 @@ static int clk_debugfs_register_one(struct clk *c)
 	return 0;
 
 err_out:
-	d = c->dentry;
-	list_for_each_entry_safe(child, child_tmp, &d->d_subdirs, d_u.d_child)
-		debugfs_remove(child);
-	debugfs_remove(c->dentry);
+	debugfs_remove_recursive(c->dentry);
 	return err;
 }
 
diff --git a/drivers/staging/pohmelfs/dir.c b/drivers/staging/pohmelfs/dir.c
index 9732a9666cc..7598e77672a 100644
--- a/drivers/staging/pohmelfs/dir.c
+++ b/drivers/staging/pohmelfs/dir.c
@@ -512,7 +512,7 @@ struct dentry *pohmelfs_lookup(struct inode *dir, struct dentry *dentry, struct
 	int err, lock_type = POHMELFS_READ_LOCK, need_lock = 1;
 	struct qstr str = dentry->d_name;
 
-	if ((nd->intent.open.flags & O_ACCMODE) > 1)
+	if ((nd->intent.open.flags & O_ACCMODE) != O_RDONLY)
 		lock_type = POHMELFS_WRITE_LOCK;
 
 	if (test_bit(NETFS_INODE_OWNED, &parent->state)) {
diff --git a/drivers/staging/pohmelfs/inode.c b/drivers/staging/pohmelfs/inode.c
index c0f0ac7c1cd..f3c6060c96b 100644
--- a/drivers/staging/pohmelfs/inode.c
+++ b/drivers/staging/pohmelfs/inode.c
@@ -887,11 +887,16 @@ static struct inode *pohmelfs_alloc_inode(struct super_block *sb)
 /*
  * We want fsync() to work on POHMELFS.
  */
-static int pohmelfs_fsync(struct file *file, int datasync)
+static int pohmelfs_fsync(struct file *file, loff_t start, loff_t end, int datasync)
 {
 	struct inode *inode = file->f_mapping->host;
-
-	return sync_inode_metadata(inode, 1);
+	int err = filemap_write_and_wait_range(inode->i_mapping, start, end);
+	if (!err) {
+		mutex_lock(&inode->i_mutex);
+		err = sync_inode_metadata(inode, 1);
+		mutex_unlock(&inode->i_mutex);
+	}
+	return err;
 }
 
 ssize_t pohmelfs_write(struct file *file, const char __user *buf,
diff --git a/drivers/usb/gadget/printer.c b/drivers/usb/gadget/printer.c
index 271ef94668e..978e6a101bf 100644
--- a/drivers/usb/gadget/printer.c
+++ b/drivers/usb/gadget/printer.c
@@ -795,12 +795,14 @@ printer_write(struct file *fd, const char __user *buf, size_t len, loff_t *ptr)
 }
 
 static int
-printer_fsync(struct file *fd, int datasync)
+printer_fsync(struct file *fd, loff_t start, loff_t end, int datasync)
 {
 	struct printer_dev	*dev = fd->private_data;
+	struct inode *inode = fd->f_path.dentry->d_inode;
 	unsigned long		flags;
 	int			tx_list_empty;
 
+	mutex_lock(&inode->i_mutex);
 	spin_lock_irqsave(&dev->lock, flags);
 	tx_list_empty = (likely(list_empty(&dev->tx_reqs)));
 	spin_unlock_irqrestore(&dev->lock, flags);
@@ -810,6 +812,7 @@ printer_fsync(struct file *fd, int datasync)
 		wait_event_interruptible(dev->tx_flush_wait,
 				(likely(list_empty(&dev->tx_reqs_active))));
 	}
+	mutex_unlock(&inode->i_mutex);
 
 	return 0;
 }
diff --git a/drivers/video/fb_defio.c b/drivers/video/fb_defio.c
index 804000183c5..32814e8800e 100644
--- a/drivers/video/fb_defio.c
+++ b/drivers/video/fb_defio.c
@@ -66,19 +66,26 @@ static int fb_deferred_io_fault(struct vm_area_struct *vma,
 	return 0;
 }
 
-int fb_deferred_io_fsync(struct file *file, int datasync)
+int fb_deferred_io_fsync(struct file *file, loff_t start, loff_t end, int datasync)
 {
 	struct fb_info *info = file->private_data;
+	struct inode *inode = file->f_path.dentry->d_inode;
+	int err = filemap_write_and_wait_range(inode->i_mapping, start, end);
+	if (err)
+		return err;
 
 	/* Skip if deferred io is compiled-in but disabled on this fbdev */
 	if (!info->fbdefio)
 		return 0;
 
+	mutex_lock(&inode->i_mutex);
 	/* Kill off the delayed work */
 	cancel_delayed_work_sync(&info->deferred_work);
 
 	/* Run it immediately */
-	return schedule_delayed_work(&info->deferred_work, 0);
+	err = schedule_delayed_work(&info->deferred_work, 0);
+	mutex_unlock(&inode->i_mutex);
+	return err;
 }
 EXPORT_SYMBOL_GPL(fb_deferred_io_fsync);