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

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  autofs4: deal with autofs4_write/autofs4_write races
  autofs4: catatonic_mode vs. notify_daemon race
  autofs4: autofs4_wait() vs. autofs4_catatonic_mode() race
  hfsplus: creation of hidden dir on mount can fail
  block_dev: Suppress bdev_cache_init() kmemleak warninig
  fix shrink_dcache_parent() livelock
  coda: switch coda_cnode_make() to sane API as well, clean coda_lookup()
  coda: deal correctly with allocation failure from coda_cnode_makectl()
  securityfs: fix object creation races

10 files changed, 86 insertions, 73 deletions

diff --git a/fs/autofs4/autofs_i.h b/fs/autofs4/autofs_i.h
index 5869d4e974a9..d8d8e7ba6a1e 100644
--- a/fs/autofs4/autofs_i.h
+++ b/fs/autofs4/autofs_i.h
@@ -116,6 +116,7 @@ struct autofs_sb_info {
 	int needs_reghost;
 	struct super_block *sb;
 	struct mutex wq_mutex;
+	struct mutex pipe_mutex;
 	spinlock_t fs_lock;
 	struct autofs_wait_queue *queues; /* Wait queue pointer */
 	spinlock_t lookup_lock;
diff --git a/fs/autofs4/inode.c b/fs/autofs4/inode.c
index 2ba44c79d548..e16980b00b8d 100644
--- a/fs/autofs4/inode.c
+++ b/fs/autofs4/inode.c
@@ -225,6 +225,7 @@ int autofs4_fill_super(struct super_block *s, void *data, int silent)
 	sbi->min_proto = 0;
 	sbi->max_proto = 0;
 	mutex_init(&sbi->wq_mutex);
+	mutex_init(&sbi->pipe_mutex);
 	spin_lock_init(&sbi->fs_lock);
 	sbi->queues = NULL;
 	spin_lock_init(&sbi->lookup_lock);
diff --git a/fs/autofs4/waitq.c b/fs/autofs4/waitq.c
index e1fbdeef85db..9ef5b2914407 100644
--- a/fs/autofs4/waitq.c
+++ b/fs/autofs4/waitq.c
@@ -56,26 +56,27 @@ void autofs4_catatonic_mode(struct autofs_sb_info *sbi)
 	mutex_unlock(&sbi->wq_mutex);
 }
 
-static int autofs4_write(struct file *file, const void *addr, int bytes)
+static int autofs4_write(struct autofs_sb_info *sbi,
+			 struct file *file, const void *addr, int bytes)
 {
 	unsigned long sigpipe, flags;
 	mm_segment_t fs;
 	const char *data = (const char *)addr;
 	ssize_t wr = 0;
 
-	/** WARNING: this is not safe for writing more than PIPE_BUF bytes! **/
-
 	sigpipe = sigismember(&current->pending.signal, SIGPIPE);
 
 	/* Save pointer to user space and point back to kernel space */
 	fs = get_fs();
 	set_fs(KERNEL_DS);
 
+	mutex_lock(&sbi->pipe_mutex);
 	while (bytes &&
 	       (wr = file->f_op->write(file,data,bytes,&file->f_pos)) > 0) {
 		data += wr;
 		bytes -= wr;
 	}
+	mutex_lock(&sbi->pipe_mutex);
 
 	set_fs(fs);
 
@@ -110,6 +111,13 @@ static void autofs4_notify_daemon(struct autofs_sb_info *sbi,
 
 	pkt.hdr.proto_version = sbi->version;
 	pkt.hdr.type = type;
+	mutex_lock(&sbi->wq_mutex);
+
+	/* Check if we have become catatonic */
+	if (sbi->catatonic) {
+		mutex_unlock(&sbi->wq_mutex);
+		return;
+	}
 	switch (type) {
 	/* Kernel protocol v4 missing and expire packets */
 	case autofs_ptype_missing:
@@ -163,22 +171,18 @@ static void autofs4_notify_daemon(struct autofs_sb_info *sbi,
 	}
 	default:
 		printk("autofs4_notify_daemon: bad type %d!\n", type);
+		mutex_unlock(&sbi->wq_mutex);
 		return;
 	}
 
-	/* Check if we have become catatonic */
-	mutex_lock(&sbi->wq_mutex);
-	if (!sbi->catatonic) {
-		pipe = sbi->pipe;
-		get_file(pipe);
-	}
+	pipe = sbi->pipe;
+	get_file(pipe);
+
 	mutex_unlock(&sbi->wq_mutex);
 
-	if (pipe) {
-		if (autofs4_write(pipe, &pkt, pktsz))
-			autofs4_catatonic_mode(sbi);
-		fput(pipe);
-	}
+	if (autofs4_write(sbi, pipe, &pkt, pktsz))
+		autofs4_catatonic_mode(sbi);
+	fput(pipe);
 }
 
 static int autofs4_getpath(struct autofs_sb_info *sbi,
@@ -257,6 +261,9 @@ static int validate_request(struct autofs_wait_queue **wait,
 	struct autofs_wait_queue *wq;
 	struct autofs_info *ino;
 
+	if (sbi->catatonic)
+		return -ENOENT;
+
 	/* Wait in progress, continue; */
 	wq = autofs4_find_wait(sbi, qstr);
 	if (wq) {
@@ -289,6 +296,9 @@ static int validate_request(struct autofs_wait_queue **wait,
 			if (mutex_lock_interruptible(&sbi->wq_mutex))
 				return -EINTR;
 
+			if (sbi->catatonic)
+				return -ENOENT;
+
 			wq = autofs4_find_wait(sbi, qstr);
 			if (wq) {
 				*wait = wq;
@@ -389,7 +399,7 @@ int autofs4_wait(struct autofs_sb_info *sbi, struct dentry *dentry,
 
 	ret = validate_request(&wq, sbi, &qstr, dentry, notify);
 	if (ret <= 0) {
-		if (ret == 0)
+		if (ret != -EINTR)
 			mutex_unlock(&sbi->wq_mutex);
 		kfree(qstr.name);
 		return ret;
diff --git a/fs/block_dev.c b/fs/block_dev.c
index 69a5b6fbee2b..afe74dda632b 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -25,7 +25,6 @@
 #include <linux/uio.h>
 #include <linux/namei.h>
 #include <linux/log2.h>
-#include <linux/kmemleak.h>
 #include <linux/cleancache.h>
 #include <asm/uaccess.h>
 #include "internal.h"
@@ -521,7 +520,7 @@ static struct super_block *blockdev_superblock __read_mostly;
 void __init bdev_cache_init(void)
 {
 	int err;
-	struct vfsmount *bd_mnt;
+	static struct vfsmount *bd_mnt;
 
 	bdev_cachep = kmem_cache_create("bdev_cache", sizeof(struct bdev_inode),
 			0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
@@ -533,12 +532,7 @@ void __init bdev_cache_init(void)
 	bd_mnt = kern_mount(&bd_type);
 	if (IS_ERR(bd_mnt))
 		panic("Cannot create bdev pseudo-fs");
-	/*
-	 * This vfsmount structure is only used to obtain the
-	 * blockdev_superblock, so tell kmemleak not to report it.
-	 */
-	kmemleak_not_leak(bd_mnt);
-	blockdev_superblock = bd_mnt->mnt_sb;	/* For writeback */
+	blockdev_superblock = bd_mnt->mnt_sb;   /* For writeback */
 }
 
 /*
diff --git a/fs/coda/cnode.c b/fs/coda/cnode.c
index 6475877b0763..911cf30d057d 100644
--- a/fs/coda/cnode.c
+++ b/fs/coda/cnode.c
@@ -88,24 +88,21 @@ struct inode * coda_iget(struct super_block * sb, struct CodaFid * fid,
    - link the two up if this is needed
    - fill in the attributes
 */
-int coda_cnode_make(struct inode **inode, struct CodaFid *fid, struct super_block *sb)
+struct inode *coda_cnode_make(struct CodaFid *fid, struct super_block *sb)
 {
         struct coda_vattr attr;
+	struct inode *inode;
         int error;
         
 	/* We get inode numbers from Venus -- see venus source */
 	error = venus_getattr(sb, fid, &attr);
-	if ( error ) {
-	    *inode = NULL;
-	    return error;
-	} 
+	if (error)
+		return ERR_PTR(error);
 
-	*inode = coda_iget(sb, fid, &attr);
-	if ( IS_ERR(*inode) ) {
+	inode = coda_iget(sb, fid, &attr);
+	if (IS_ERR(inode))
 		printk("coda_cnode_make: coda_iget failed\n");
-                return PTR_ERR(*inode);
-        }
-	return 0;
+	return inode;
 }
 
 
@@ -156,19 +153,16 @@ struct inode *coda_fid_to_inode(struct CodaFid *fid, struct super_block *sb)
 }
 
 /* the CONTROL inode is made without asking attributes from Venus */
-int coda_cnode_makectl(struct inode **inode, struct super_block *sb)
+struct inode *coda_cnode_makectl(struct super_block *sb)
 {
-	int error = -ENOMEM;
-
-	*inode = new_inode(sb);
-	if (*inode) {
-		(*inode)->i_ino = CTL_INO;
-		(*inode)->i_op = &coda_ioctl_inode_operations;
-		(*inode)->i_fop = &coda_ioctl_operations;
-		(*inode)->i_mode = 0444;
-		error = 0;
+	struct inode *inode = new_inode(sb);
+	if (inode) {
+		inode->i_ino = CTL_INO;
+		inode->i_op = &coda_ioctl_inode_operations;
+		inode->i_fop = &coda_ioctl_operations;
+		inode->i_mode = 0444;
+		return inode;
 	}
-
-	return error;
+	return ERR_PTR(-ENOMEM);
 }
 
diff --git a/fs/coda/coda_fs_i.h b/fs/coda/coda_fs_i.h
index e35071b1de0e..b24fdfd8a3f0 100644
--- a/fs/coda/coda_fs_i.h
+++ b/fs/coda/coda_fs_i.h
@@ -49,9 +49,9 @@ struct coda_file_info {
 #define C_DYING       0x4   /* from venus (which died) */
 #define C_PURGE       0x8
 
-int coda_cnode_make(struct inode **, struct CodaFid *, struct super_block *);
+struct inode *coda_cnode_make(struct CodaFid *, struct super_block *);
 struct inode *coda_iget(struct super_block *sb, struct CodaFid *fid, struct coda_vattr *attr);
-int coda_cnode_makectl(struct inode **inode, struct super_block *sb);
+struct inode *coda_cnode_makectl(struct super_block *sb);
 struct inode *coda_fid_to_inode(struct CodaFid *fid, struct super_block *sb);
 void coda_replace_fid(struct inode *, struct CodaFid *, struct CodaFid *);
 
diff --git a/fs/coda/dir.c b/fs/coda/dir.c
index 83d2fd8ec24b..177515829062 100644
--- a/fs/coda/dir.c
+++ b/fs/coda/dir.c
@@ -96,12 +96,11 @@ const struct file_operations coda_dir_operations = {
 /* access routines: lookup, readlink, permission */
 static struct dentry *coda_lookup(struct inode *dir, struct dentry *entry, struct nameidata *nd)
 {
-	struct inode *inode = NULL;
-	struct CodaFid resfid = { { 0, } };
-	int type = 0;
-	int error = 0;
+	struct super_block *sb = dir->i_sb;
 	const char *name = entry->d_name.name;
 	size_t length = entry->d_name.len;
+	struct inode *inode;
+	int type = 0;
 
 	if (length > CODA_MAXNAMLEN) {
 		printk(KERN_ERR "name too long: lookup, %s (%*s)\n",
@@ -111,23 +110,21 @@ static struct dentry *coda_lookup(struct inode *dir, struct dentry *entry, struc
 
 	/* control object, create inode on the fly */
 	if (coda_isroot(dir) && coda_iscontrol(name, length)) {
-		error = coda_cnode_makectl(&inode, dir->i_sb);
+		inode = coda_cnode_makectl(sb);
 		type = CODA_NOCACHE;
-		goto exit;
+	} else {
+		struct CodaFid fid = { { 0, } };
+		int error = venus_lookup(sb, coda_i2f(dir), name, length,
+				     &type, &fid);
+		inode = !error ? coda_cnode_make(&fid, sb) : ERR_PTR(error);
 	}
 
-	error = venus_lookup(dir->i_sb, coda_i2f(dir), name, length,
-			     &type, &resfid);
-	if (!error)
-		error = coda_cnode_make(&inode, &resfid, dir->i_sb);
-
-	if (error && error != -ENOENT)
-		return ERR_PTR(error);
-
-exit:
-	if (inode && (type & CODA_NOCACHE))
+	if (!IS_ERR(inode) && (type & CODA_NOCACHE))
 		coda_flag_inode(inode, C_VATTR | C_PURGE);
 
+	if (inode == ERR_PTR(-ENOENT))
+		inode = NULL;
+
 	return d_splice_alias(inode, entry);
 }
 
diff --git a/fs/coda/inode.c b/fs/coda/inode.c
index 1c08a8cd673a..5e2e1b3f068d 100644
--- a/fs/coda/inode.c
+++ b/fs/coda/inode.c
@@ -204,10 +204,12 @@ static int coda_fill_super(struct super_block *sb, void *data, int silent)
 	printk("coda_read_super: rootfid is %s\n", coda_f2s(&fid));
 	
 	/* make root inode */
-        error = coda_cnode_make(&root, &fid, sb);
-        if ( error || !root ) {
-	    printk("Failure of coda_cnode_make for root: error %d\n", error);
-	    goto error;
+        root = coda_cnode_make(&fid, sb);
+        if (IS_ERR(root)) {
+		error = PTR_ERR(root);
+		printk("Failure of coda_cnode_make for root: error %d\n", error);
+		root = NULL;
+		goto error;
 	} 
 
 	printk("coda_read_super: rootinode is %ld dev %s\n", 
diff --git a/fs/dcache.c b/fs/dcache.c
index 3c6d3113a255..616fedff011a 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -243,6 +243,7 @@ static void dentry_lru_add(struct dentry *dentry)
 static void __dentry_lru_del(struct dentry *dentry)
 {
 	list_del_init(&dentry->d_lru);
+	dentry->d_flags &= ~DCACHE_SHRINK_LIST;
 	dentry->d_sb->s_nr_dentry_unused--;
 	dentry_stat.nr_unused--;
 }
@@ -806,6 +807,7 @@ relock:
 			spin_unlock(&dentry->d_lock);
 		} else {
 			list_move_tail(&dentry->d_lru, &tmp);
+			dentry->d_flags |= DCACHE_SHRINK_LIST;
 			spin_unlock(&dentry->d_lock);
 			if (!--count)
 				break;
@@ -1097,14 +1099,19 @@ resume:
 
 		/*
 		 * move only zero ref count dentries to the dispose list.
+		 *
+		 * Those which are presently on the shrink list, being processed
+		 * by shrink_dentry_list(), shouldn't be moved.  Otherwise the
+		 * loop in shrink_dcache_parent() might not make any progress
+		 * and loop forever.
 		 */
-		if (!dentry->d_count) {
+		if (dentry->d_count) {
+			dentry_lru_del(dentry);
+		} else if (!(dentry->d_flags & DCACHE_SHRINK_LIST)) {
 			dentry_lru_move_list(dentry, dispose);
+			dentry->d_flags |= DCACHE_SHRINK_LIST;
 			found++;
-		} else {
-			dentry_lru_del(dentry);
 		}
-
 		/*
 		 * We can return to the caller if we have found some (this
 		 * ensures forward progress). We'll be coming back to find
diff --git a/fs/hfsplus/super.c b/fs/hfsplus/super.c
index edf0a801446b..427682ca9e48 100644
--- a/fs/hfsplus/super.c
+++ b/fs/hfsplus/super.c
@@ -499,9 +499,16 @@ static int hfsplus_fill_super(struct super_block *sb, void *data, int silent)
 		if (!sbi->hidden_dir) {
 			mutex_lock(&sbi->vh_mutex);
 			sbi->hidden_dir = hfsplus_new_inode(sb, S_IFDIR);
-			hfsplus_create_cat(sbi->hidden_dir->i_ino, root, &str,
-					   sbi->hidden_dir);
+			if (!sbi->hidden_dir) {
+				mutex_unlock(&sbi->vh_mutex);
+				err = -ENOMEM;
+				goto out_put_root;
+			}
+			err = hfsplus_create_cat(sbi->hidden_dir->i_ino, root,
+						 &str, sbi->hidden_dir);
 			mutex_unlock(&sbi->vh_mutex);
+			if (err)
+				goto out_put_hidden_dir;
 
 			hfsplus_mark_inode_dirty(sbi->hidden_dir,
 						 HFSPLUS_I_CAT_DIRTY);