X-Git-Url: http://pilppa.org/gitweb/gitweb.cgi?a=blobdiff_plain;f=fs%2Fisofs%2Fcompress.c;h=defb932eee9a9f45836ac2f62ee9dcf5f3838152;hb=5ff580c10ec06fd296bd23d4570c1a95194094a0;hp=731816332b12b5a310623fbc85134710714ddd41;hpb=0a1340c185734a57fbf4775927966ad4a1347b02;p=linux-2.6-omap-h63xx.git

diff --git a/fs/isofs/compress.c b/fs/isofs/compress.c
index 731816332b1..defb932eee9 100644
--- a/fs/isofs/compress.c
+++ b/fs/isofs/compress.c
@@ -33,7 +33,7 @@ static char zisofs_sink_page[PAGE_CACHE_SIZE];
  * allocation; this avoids failures at block-decompression time.
  */
 static void *zisofs_zlib_workspace;
-static struct semaphore zisofs_zlib_semaphore;
+static DEFINE_MUTEX(zisofs_zlib_lock);
 
 /*
  * When decompressing, we typically obtain more than one page
@@ -42,7 +42,7 @@ static struct semaphore zisofs_zlib_semaphore;
  */
 static int zisofs_readpage(struct file *file, struct page *page)
 {
-	struct inode *inode = file->f_dentry->d_inode;
+	struct inode *inode = file->f_path.dentry->d_inode;
 	struct address_space *mapping = inode->i_mapping;
 	unsigned int maxpage, xpage, fpage, blockindex;
 	unsigned long offset;
@@ -72,6 +72,17 @@ static int zisofs_readpage(struct file *file, struct page *page)
 	offset = index & ~zisofs_block_page_mask;
 	blockindex = offset >> zisofs_block_page_shift;
 	maxpage = (inode->i_size + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
+
+	/*
+	 * If this page is wholly outside i_size we just return zero;
+	 * do_generic_file_read() will handle this for us
+	 */
+	if (page->index >= maxpage) {
+		SetPageUptodate(page);
+		unlock_page(page);
+		return 0;
+	}
+
 	maxpage = min(zisofs_block_pages, maxpage-offset);
 
 	for ( i = 0 ; i < maxpage ; i++, offset++ ) {
@@ -180,9 +191,9 @@ static int zisofs_readpage(struct file *file, struct page *page)
 
 		/* First block is special since it may be fractional.
 		   We also wait for it before grabbing the zlib
-		   semaphore; odds are that the subsequent blocks are
+		   mutex; odds are that the subsequent blocks are
 		   going to come in in short order so we don't hold
-		   the zlib semaphore longer than necessary. */
+		   the zlib mutex longer than necessary. */
 
 		if ( !bh || (wait_on_buffer(bh), !buffer_uptodate(bh)) ) {
 			printk(KERN_DEBUG "zisofs: Hit null buffer, fpage = %d, xpage = %d, csize = %ld\n",
@@ -194,7 +205,7 @@ static int zisofs_readpage(struct file *file, struct page *page)
 		csize -= stream.avail_in;
 
 		stream.workspace = zisofs_zlib_workspace;
-		down(&zisofs_zlib_semaphore);
+		mutex_lock(&zisofs_zlib_lock);
 		
 		zerr = zlib_inflateInit(&stream);
 		if ( zerr != Z_OK ) {
@@ -281,7 +292,7 @@ static int zisofs_readpage(struct file *file, struct page *page)
 		zlib_inflateEnd(&stream);
 
 	z_eio:
-		up(&zisofs_zlib_semaphore);
+		mutex_unlock(&zisofs_zlib_lock);
 
 	b_eio:
 		for ( i = 0 ; i < haveblocks ; i++ ) {
@@ -317,31 +328,16 @@ const struct address_space_operations zisofs_aops = {
 	/* No bmap operation supported */
 };
 
-static int initialized;
-
 int __init zisofs_init(void)
 {
-	if ( initialized ) {
-		printk("zisofs_init: called more than once\n");
-		return 0;
-	}
-
 	zisofs_zlib_workspace = vmalloc(zlib_inflate_workspacesize());
 	if ( !zisofs_zlib_workspace )
 		return -ENOMEM;
-	init_MUTEX(&zisofs_zlib_semaphore);
 
-	initialized = 1;
 	return 0;
 }
 
 void zisofs_cleanup(void)
 {
-	if ( !initialized ) {
-		printk("zisofs_cleanup: called without initialization\n");
-		return;
-	}
-
 	vfree(zisofs_zlib_workspace);
-	initialized = 0;
 }