Merge branch 'next' into for-linus

1 files changed, 21 insertions, 9 deletions

diff --git a/fs/squashfs/cache.c b/fs/squashfs/cache.c
index f744be98cd5..af0b7380259 100644
--- a/fs/squashfs/cache.c
+++ b/fs/squashfs/cache.c
@@ -70,11 +70,15 @@ struct squashfs_cache_entry *squashfs_cache_get(struct super_block *sb,
 	spin_lock(&cache->lock);
 
 	while (1) {
-		for (i = 0; i < cache->entries; i++)
-			if (cache->entry[i].block == block)
+		for (i = cache->curr_blk, n = 0; n < cache->entries; n++) {
+			if (cache->entry[i].block == block) {
+				cache->curr_blk = i;
 				break;
+			}
+			i = (i + 1) % cache->entries;
+		}
 
-		if (i == cache->entries) {
+		if (n == cache->entries) {
 			/*
 			 * Block not in cache, if all cache entries are used
 			 * go to sleep waiting for one to become available.
@@ -245,6 +249,7 @@ struct squashfs_cache *squashfs_cache_init(char *name, int entries,
 		goto cleanup;
 	}
 
+	cache->curr_blk = 0;
 	cache->next_blk = 0;
 	cache->unused = entries;
 	cache->entries = entries;
@@ -332,17 +337,20 @@ int squashfs_read_metadata(struct super_block *sb, void *buffer,
 		u64 *block, int *offset, int length)
 {
 	struct squashfs_sb_info *msblk = sb->s_fs_info;
-	int bytes, copied = length;
+	int bytes, res = length;
 	struct squashfs_cache_entry *entry;
 
 	TRACE("Entered squashfs_read_metadata [%llx:%x]\n", *block, *offset);
 
 	while (length) {
 		entry = squashfs_cache_get(sb, msblk->block_cache, *block, 0);
-		if (entry->error)
-			return entry->error;
-		else if (*offset >= entry->length)
-			return -EIO;
+		if (entry->error) {
+			res = entry->error;
+			goto error;
+		} else if (*offset >= entry->length) {
+			res = -EIO;
+			goto error;
+		}
 
 		bytes = squashfs_copy_data(buffer, entry, *offset, length);
 		if (buffer)
@@ -358,7 +366,11 @@ int squashfs_read_metadata(struct super_block *sb, void *buffer,
 		squashfs_cache_put(entry);
 	}
 
-	return copied;
+	return res;
+
+error:
+	squashfs_cache_put(entry);
+	return res;
 }