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Commit 5cd9599b authored by Linus Torvalds's avatar Linus Torvalds
Browse files

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
parents e343a895 d668dc56

fs/autofs4/autofs_i.h

+1 −0
Original line number Diff line number Diff line
@@ -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;

fs/autofs4/inode.c

+1 −0
Original line number Diff line number Diff line
@@ -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);

fs/autofs4/waitq.c

+25 −15
Original line number Diff line number Diff line
@@ -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:
@@ -163,23 +171,19 @@ 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);

	}



	mutex_unlock(&sbi->wq_mutex);



	if (pipe) {

		if (autofs4_write(pipe, &pkt, pktsz))

	if (autofs4_write(sbi, pipe, &pkt, pktsz))

		autofs4_catatonic_mode(sbi);

	fput(pipe);

}

}



static int autofs4_getpath(struct autofs_sb_info *sbi,

			   struct dentry *dentry, char **name)
@@ -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;

fs/block_dev.c

+2 −8
Original line number Diff line number Diff line
@@ -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|
@@ -533,11 +532,6 @@ 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 */

}

fs/coda/cnode.c

+16 −22
Original line number Diff line number Diff line
@@ -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);

}