Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6

7 files changed, 110 insertions, 27 deletions

diff --git a/fs/direct-io.c b/fs/direct-io.c
index 8593f3dfd29..52bb2638f7a 100644
--- a/fs/direct-io.c
+++ b/fs/direct-io.c
@@ -1106,7 +1106,7 @@ direct_io_worker(int rw, struct kiocb *iocb, struct inode *inode,
 	spin_lock_irqsave(&dio->bio_lock, flags);
 	ret2 = --dio->refcount;
 	spin_unlock_irqrestore(&dio->bio_lock, flags);
-	BUG_ON(!dio->is_async && ret2 != 0);
+
 	if (ret2 == 0) {
 		ret = dio_complete(dio, offset, ret);
 		kfree(dio);
diff --git a/fs/ecryptfs/ecryptfs_kernel.h b/fs/ecryptfs/ecryptfs_kernel.h
index 403e3bad145..1b9dd9a96f1 100644
--- a/fs/ecryptfs/ecryptfs_kernel.h
+++ b/fs/ecryptfs/ecryptfs_kernel.h
@@ -580,5 +580,7 @@ void
 ecryptfs_write_header_metadata(char *virt,
 			       struct ecryptfs_crypt_stat *crypt_stat,
 			       size_t *written);
+int ecryptfs_write_zeros(struct file *file, pgoff_t index, int start,
+			 int num_zeros);
 
 #endif /* #ifndef ECRYPTFS_KERNEL_H */
diff --git a/fs/ecryptfs/inode.c b/fs/ecryptfs/inode.c
index 1548be26b5e..83e94fedd4e 100644
--- a/fs/ecryptfs/inode.c
+++ b/fs/ecryptfs/inode.c
@@ -800,6 +800,25 @@ int ecryptfs_truncate(struct dentry *dentry, loff_t new_length)
 			goto out_fput;
 		}
 	} else { /* new_length < i_size_read(inode) */
+		pgoff_t index = 0;
+		int end_pos_in_page = -1;
+
+		if (new_length != 0) {
+			index = ((new_length - 1) >> PAGE_CACHE_SHIFT);
+			end_pos_in_page = ((new_length - 1) & ~PAGE_CACHE_MASK);
+		}
+		if (end_pos_in_page != (PAGE_CACHE_SIZE - 1)) {
+			if ((rc = ecryptfs_write_zeros(&fake_ecryptfs_file,
+						       index,
+						       (end_pos_in_page + 1),
+						       ((PAGE_CACHE_SIZE - 1)
+							- end_pos_in_page)))) {
+				printk(KERN_ERR "Error attempting to zero out "
+				       "the remainder of the end page on "
+				       "reducing truncate; rc = [%d]\n", rc);
+				goto out_fput;
+			}
+		}
 		vmtruncate(inode, new_length);
 		rc = ecryptfs_write_inode_size_to_metadata(
 			lower_file, lower_dentry->d_inode, inode, dentry,
@@ -875,9 +894,54 @@ static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia)
 	struct ecryptfs_crypt_stat *crypt_stat;
 
 	crypt_stat = &ecryptfs_inode_to_private(dentry->d_inode)->crypt_stat;
-	lower_dentry = ecryptfs_dentry_to_lower(dentry);
+	if (!(crypt_stat->flags & ECRYPTFS_STRUCT_INITIALIZED))
+		ecryptfs_init_crypt_stat(crypt_stat);
 	inode = dentry->d_inode;
 	lower_inode = ecryptfs_inode_to_lower(inode);
+	lower_dentry = ecryptfs_dentry_to_lower(dentry);
+	mutex_lock(&crypt_stat->cs_mutex);
+	if (S_ISDIR(dentry->d_inode->i_mode))
+		crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
+	else if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)
+		 || !(crypt_stat->flags & ECRYPTFS_KEY_VALID)) {
+		struct vfsmount *lower_mnt;
+		struct file *lower_file = NULL;
+		struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
+		int lower_flags;
+
+		lower_mnt = ecryptfs_dentry_to_lower_mnt(dentry);
+		lower_flags = O_RDONLY;
+		if ((rc = ecryptfs_open_lower_file(&lower_file, lower_dentry,
+						   lower_mnt, lower_flags))) {
+			printk(KERN_ERR
+			       "Error opening lower file; rc = [%d]\n", rc);
+			mutex_unlock(&crypt_stat->cs_mutex);
+			goto out;
+		}
+		mount_crypt_stat = &ecryptfs_superblock_to_private(
+			dentry->d_sb)->mount_crypt_stat;
+		if ((rc = ecryptfs_read_metadata(dentry, lower_file))) {
+			if (!(mount_crypt_stat->flags
+			      & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) {
+				rc = -EIO;
+				printk(KERN_WARNING "Attempt to read file that "
+				       "is not in a valid eCryptfs format, "
+				       "and plaintext passthrough mode is not "
+				       "enabled; returning -EIO\n");
+
+				mutex_unlock(&crypt_stat->cs_mutex);
+				fput(lower_file);
+				goto out;
+			}
+			rc = 0;
+			crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
+			mutex_unlock(&crypt_stat->cs_mutex);
+			fput(lower_file);
+			goto out;
+		}
+		fput(lower_file);
+	}
+	mutex_unlock(&crypt_stat->cs_mutex);
 	if (ia->ia_valid & ATTR_SIZE) {
 		ecryptfs_printk(KERN_DEBUG,
 				"ia->ia_valid = [0x%x] ATTR_SIZE" " = [0x%x]\n",
diff --git a/fs/ecryptfs/mmap.c b/fs/ecryptfs/mmap.c
index 55cec98a84e..7d5a43cb0d5 100644
--- a/fs/ecryptfs/mmap.c
+++ b/fs/ecryptfs/mmap.c
@@ -56,9 +56,6 @@ static struct page *ecryptfs_get1page(struct file *file, int index)
 	return read_mapping_page(mapping, index, (void *)file);
 }
 
-static
-int write_zeros(struct file *file, pgoff_t index, int start, int num_zeros);
-
 /**
  * ecryptfs_fill_zeros
  * @file: The ecryptfs file
@@ -101,10 +98,13 @@ int ecryptfs_fill_zeros(struct file *file, loff_t new_length)
 	if (old_end_page_index == new_end_page_index) {
 		/* Start and end are in the same page; we just need to
 		 * set a portion of the existing page to zero's */
-		rc = write_zeros(file, index, (old_end_pos_in_page + 1),
-				 (new_end_pos_in_page - old_end_pos_in_page));
+		rc = ecryptfs_write_zeros(file, index,
+					  (old_end_pos_in_page + 1),
+					  (new_end_pos_in_page
+					   - old_end_pos_in_page));
 		if (rc)
-			ecryptfs_printk(KERN_ERR, "write_zeros(file=[%p], "
+			ecryptfs_printk(KERN_ERR, "ecryptfs_write_zeros("
+					"file=[%p], "
 					"index=[0x%.16x], "
 					"old_end_pos_in_page=[d], "
 					"(PAGE_CACHE_SIZE - new_end_pos_in_page"
@@ -117,10 +117,10 @@ int ecryptfs_fill_zeros(struct file *file, loff_t new_length)
 		goto out;
 	}
 	/* Fill the remainder of the previous last page with zeros */
-	rc = write_zeros(file, index, (old_end_pos_in_page + 1),
+	rc = ecryptfs_write_zeros(file, index, (old_end_pos_in_page + 1),
 			 ((PAGE_CACHE_SIZE - 1) - old_end_pos_in_page));
 	if (rc) {
-		ecryptfs_printk(KERN_ERR, "write_zeros(file=[%p], "
+		ecryptfs_printk(KERN_ERR, "ecryptfs_write_zeros(file=[%p], "
 				"index=[0x%.16x], old_end_pos_in_page=[d], "
 				"(PAGE_CACHE_SIZE - old_end_pos_in_page)=[d]) "
 				"returned [%d]\n", file, index,
@@ -131,9 +131,10 @@ int ecryptfs_fill_zeros(struct file *file, loff_t new_length)
 	index++;
 	while (index < new_end_page_index) {
 		/* Fill all intermediate pages with zeros */
-		rc = write_zeros(file, index, 0, PAGE_CACHE_SIZE);
+		rc = ecryptfs_write_zeros(file, index, 0, PAGE_CACHE_SIZE);
 		if (rc) {
-			ecryptfs_printk(KERN_ERR, "write_zeros(file=[%p], "
+			ecryptfs_printk(KERN_ERR, "ecryptfs_write_zeros("
+					"file=[%p], "
 					"index=[0x%.16x], "
 					"old_end_pos_in_page=[d], "
 					"(PAGE_CACHE_SIZE - new_end_pos_in_page"
@@ -149,9 +150,9 @@ int ecryptfs_fill_zeros(struct file *file, loff_t new_length)
 	}
 	/* Fill the portion at the beginning of the last new page with
 	 * zero's */
-	rc = write_zeros(file, index, 0, (new_end_pos_in_page + 1));
+	rc = ecryptfs_write_zeros(file, index, 0, (new_end_pos_in_page + 1));
 	if (rc) {
-		ecryptfs_printk(KERN_ERR, "write_zeros(file="
+		ecryptfs_printk(KERN_ERR, "ecryptfs_write_zeros(file="
 				"[%p], index=[0x%.16x], 0, "
 				"new_end_pos_in_page=[%d]"
 				"returned [%d]\n", file, index,
@@ -400,7 +401,6 @@ out:
 static int ecryptfs_prepare_write(struct file *file, struct page *page,
 				  unsigned from, unsigned to)
 {
-	loff_t pos;
 	int rc = 0;
 
 	if (from == 0 && to == PAGE_CACHE_SIZE)
@@ -408,15 +408,22 @@ static int ecryptfs_prepare_write(struct file *file, struct page *page,
 				   up to date. */
 	if (!PageUptodate(page))
 		rc = ecryptfs_do_readpage(file, page, page->index);
-	pos = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to;
-	if (pos > i_size_read(page->mapping->host)) {
-		rc = ecryptfs_truncate(file->f_path.dentry, pos);
-		if (rc) {
-			printk(KERN_ERR "Error on attempt to "
-			       "truncate to (higher) offset [%lld];"
-			       " rc = [%d]\n", pos, rc);
-			goto out;
+	if (page->index != 0) {
+		loff_t end_of_prev_pg_pos =
+			(((loff_t)page->index << PAGE_CACHE_SHIFT) - 1);
+
+		if (end_of_prev_pg_pos > i_size_read(page->mapping->host)) {
+			rc = ecryptfs_truncate(file->f_path.dentry,
+					       end_of_prev_pg_pos);
+			if (rc) {
+				printk(KERN_ERR "Error on attempt to "
+				       "truncate to (higher) offset [%lld];"
+				       " rc = [%d]\n", end_of_prev_pg_pos, rc);
+				goto out;
+			}
 		}
+		if (end_of_prev_pg_pos + 1 > i_size_read(page->mapping->host))
+			zero_user_page(page, 0, PAGE_CACHE_SIZE, KM_USER0);
 	}
 out:
 	return rc;
@@ -753,7 +760,7 @@ out:
 }
 
 /**
- * write_zeros
+ * ecryptfs_write_zeros
  * @file: The ecryptfs file
  * @index: The index in which we are writing
  * @start: The position after the last block of data
@@ -763,8 +770,8 @@ out:
  *
  * (start + num_zeros) must be less than or equal to PAGE_CACHE_SIZE
  */
-static
-int write_zeros(struct file *file, pgoff_t index, int start, int num_zeros)
+int
+ecryptfs_write_zeros(struct file *file, pgoff_t index, int start, int num_zeros)
 {
 	int rc = 0;
 	struct page *tmp_page;
diff --git a/fs/ext2/super.c b/fs/ext2/super.c
index c9fd8cf6eaa..5de5061eb33 100644
--- a/fs/ext2/super.c
+++ b/fs/ext2/super.c
@@ -1043,6 +1043,7 @@ static int ext2_remount (struct super_block * sb, int * flags, char * data)
 
 	if ((ext2_use_xip(sb)) && (sb->s_blocksize != PAGE_SIZE)) {
 		printk("XIP: Unsupported blocksize\n");
+		err = -EINVAL;
 		goto restore_opts;
 	}
 
diff --git a/fs/signalfd.c b/fs/signalfd.c
index f1da89203a9..3b07f26d984 100644
--- a/fs/signalfd.c
+++ b/fs/signalfd.c
@@ -133,7 +133,8 @@ static unsigned int signalfd_poll(struct file *file, poll_table *wait)
 	 * the peer disconnects.
 	 */
 	if (signalfd_lock(ctx, &lk)) {
-		if (next_signal(&lk.tsk->pending, &ctx->sigmask) > 0 ||
+		if ((lk.tsk == current &&
+		     next_signal(&lk.tsk->pending, &ctx->sigmask) > 0) ||
 		    next_signal(&lk.tsk->signal->shared_pending,
 				&ctx->sigmask) > 0)
 			events |= POLLIN;
diff --git a/fs/sync.c b/fs/sync.c
index 2f97576355b..7cd005ea763 100644
--- a/fs/sync.c
+++ b/fs/sync.c
@@ -236,6 +236,14 @@ out:
 	return ret;
 }
 
+/* It would be nice if people remember that not all the world's an i386
+   when they introduce new system calls */
+asmlinkage long sys_sync_file_range2(int fd, unsigned int flags,
+				     loff_t offset, loff_t nbytes)
+{
+	return sys_sync_file_range(fd, offset, nbytes, flags);
+}
+
 /*
  * `endbyte' is inclusive
  */