X-Git-Url: http://pilppa.org/gitweb/gitweb.cgi?a=blobdiff_plain;f=mm%2Fshmem.c;h=0493e4d0bcaab2d5b0281446171b4de57598b8ee;hb=ce8c47cf88af4da2ff429933c07f203a55d5d0a1;hp=f01e8deed645b6f0459451e0615a9f8b1e901104;hpb=ba7cc09c9c9e29a57045dc5bbf843ac1cfad3283;p=linux-2.6-omap-h63xx.git

diff --git a/mm/shmem.c b/mm/shmem.c
index f01e8deed64..0493e4d0bca 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -967,6 +967,8 @@ static inline int shmem_parse_mpol(char *value, int *policy, nodemask_t *policy_
 		*nodelist++ = '\0';
 		if (nodelist_parse(nodelist, *policy_nodes))
 			goto out;
+		if (!nodes_subset(*policy_nodes, node_online_map))
+			goto out;
 	}
 	if (!strcmp(value, "default")) {
 		*policy = MPOL_DEFAULT;
@@ -1098,9 +1100,9 @@ static int shmem_getpage(struct inode *inode, unsigned long idx,
 	 * Normally, filepage is NULL on entry, and either found
 	 * uptodate immediately, or allocated and zeroed, or read
 	 * in under swappage, which is then assigned to filepage.
-	 * But shmem_prepare_write passes in a locked filepage,
-	 * which may be found not uptodate by other callers too,
-	 * and may need to be copied from the swappage read in.
+	 * But shmem_readpage and shmem_prepare_write pass in a locked
+	 * filepage, which may be found not uptodate by other callers
+	 * too, and may need to be copied from the swappage read in.
 	 */
 repeat:
 	if (!filepage)
@@ -1483,9 +1485,18 @@ static const struct inode_operations shmem_symlink_inode_operations;
 static const struct inode_operations shmem_symlink_inline_operations;
 
 /*
- * Normally tmpfs makes no use of shmem_prepare_write, but it
- * lets a tmpfs file be used read-write below the loop driver.
+ * Normally tmpfs avoids the use of shmem_readpage and shmem_prepare_write;
+ * but providing them allows a tmpfs file to be used for splice, sendfile, and
+ * below the loop driver, in the generic fashion that many filesystems support.
  */
+static int shmem_readpage(struct file *file, struct page *page)
+{
+	struct inode *inode = page->mapping->host;
+	int error = shmem_getpage(inode, page->index, &page, SGP_CACHE, NULL);
+	unlock_page(page);
+	return error;
+}
+
 static int
 shmem_prepare_write(struct file *file, struct page *page, unsigned offset, unsigned to)
 {
@@ -1709,25 +1720,6 @@ static ssize_t shmem_file_read(struct file *filp, char __user *buf, size_t count
 	return desc.error;
 }
 
-static ssize_t shmem_file_sendfile(struct file *in_file, loff_t *ppos,
-			 size_t count, read_actor_t actor, void *target)
-{
-	read_descriptor_t desc;
-
-	if (!count)
-		return 0;
-
-	desc.written = 0;
-	desc.count = count;
-	desc.arg.data = target;
-	desc.error = 0;
-
-	do_shmem_file_read(in_file, ppos, &desc, actor);
-	if (desc.written)
-		return desc.written;
-	return desc.error;
-}
-
 static int shmem_statfs(struct dentry *dentry, struct kstatfs *buf)
 {
 	struct shmem_sb_info *sbinfo = SHMEM_SB(dentry->d_sb);
@@ -2358,13 +2350,11 @@ static void init_once(void *foo, struct kmem_cache *cachep,
 {
 	struct shmem_inode_info *p = (struct shmem_inode_info *) foo;
 
-	if (flags & SLAB_CTOR_CONSTRUCTOR) {
-		inode_init_once(&p->vfs_inode);
+	inode_init_once(&p->vfs_inode);
 #ifdef CONFIG_TMPFS_POSIX_ACL
-		p->i_acl = NULL;
-		p->i_default_acl = NULL;
+	p->i_acl = NULL;
+	p->i_default_acl = NULL;
 #endif
-	}
 }
 
 static int init_inodecache(void)
@@ -2386,6 +2376,7 @@ static const struct address_space_operations shmem_aops = {
 	.writepage	= shmem_writepage,
 	.set_page_dirty	= __set_page_dirty_no_writeback,
 #ifdef CONFIG_TMPFS
+	.readpage	= shmem_readpage,
 	.prepare_write	= shmem_prepare_write,
 	.commit_write	= simple_commit_write,
 #endif
@@ -2399,7 +2390,8 @@ static const struct file_operations shmem_file_operations = {
 	.read		= shmem_file_read,
 	.write		= shmem_file_write,
 	.fsync		= simple_sync_file,
-	.sendfile	= shmem_file_sendfile,
+	.splice_read	= generic_file_splice_read,
+	.splice_write	= generic_file_splice_write,
 #endif
 };