cramfs: propagate uncompression errors

Decompression errors can arise due to corruption of compressed blocks on
flash or in memory.  This patch propagates errors detected during
decompression back to the block layer.

Signed-off-by: David VomLehn <dvomlehn@cisco.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/cramfs/inode.c b/fs/cramfs/inode.c
index a07338d..46e5298 100644 (file)
--- a/fs/cramfs/inode.c
+++ b/fs/cramfs/inode.c
@@ -459,11 +459,14 @@ static struct dentry * cramfs_lookup(struct inode *dir, struct dentry *dentry, s
 static int cramfs_readpage(struct file *file, struct page * page)
 {
        struct inode *inode = page->mapping->host;
-       u32 maxblock, bytes_filled;
+       u32 maxblock;
+       int bytes_filled;
        void *pgdata;
 
        maxblock = (inode->i_size + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
        bytes_filled = 0;
+       pgdata = kmap(page);
+
        if (page->index < maxblock) {
                struct super_block *sb = inode->i_sb;
                u32 blkptr_offset = OFFSET(inode) + page->index*4;
@@ -472,30 +475,43 @@ static int cramfs_readpage(struct file *file, struct page * page)
                start_offset = OFFSET(inode) + maxblock*4;
                mutex_lock(&read_mutex);
                if (page->index)
-                       start_offset = *(u32 *) cramfs_read(sb, blkptr_offset-4, 4);
-               compr_len = (*(u32 *) cramfs_read(sb, blkptr_offset, 4) - start_offset);
+                       start_offset = *(u32 *) cramfs_read(sb, blkptr_offset-4,
+                               4);
+               compr_len = (*(u32 *) cramfs_read(sb, blkptr_offset, 4) -
+                       start_offset);
                mutex_unlock(&read_mutex);
-               pgdata = kmap(page);
+
                if (compr_len == 0)
                        ; /* hole */
-               else if (compr_len > (PAGE_CACHE_SIZE << 1))
-                       printk(KERN_ERR "cramfs: bad compressed blocksize %u\n", compr_len);
-               else {
+               else if (unlikely(compr_len > (PAGE_CACHE_SIZE << 1))) {
+                       pr_err("cramfs: bad compressed blocksize %u\n",
+                               compr_len);
+                       goto err;
+               } else {
                        mutex_lock(&read_mutex);
                        bytes_filled = cramfs_uncompress_block(pgdata,
                                 PAGE_CACHE_SIZE,
                                 cramfs_read(sb, start_offset, compr_len),
                                 compr_len);
                        mutex_unlock(&read_mutex);
+                       if (unlikely(bytes_filled < 0))
+                               goto err;
                }
-       } else
-               pgdata = kmap(page);
+       }
+
        memset(pgdata + bytes_filled, 0, PAGE_CACHE_SIZE - bytes_filled);
-       kunmap(page);
        flush_dcache_page(page);
+       kunmap(page);
        SetPageUptodate(page);
        unlock_page(page);
        return 0;
+
+err:
+       kunmap(page);
+       ClearPageUptodate(page);
+       SetPageError(page);
+       unlock_page(page);
+       return 0;
 }
 
 static const struct address_space_operations cramfs_aops = {

diff --git a/fs/cramfs/uncompress.c b/fs/cramfs/uncompress.c
index fc3ccb7..0233298 100644 (file)
--- a/fs/cramfs/uncompress.c
+++ b/fs/cramfs/uncompress.c
@@ -50,7 +50,7 @@ int cramfs_uncompress_block(void *dst, int dstlen, void *src, int srclen)
 err:
        printk("Error %d while decompressing!\n", err);
        printk("%p(%d)->%p(%d)\n", src, srclen, dst, dstlen);
-       return 0;
+       return -EIO;
 }
 
 int cramfs_uncompress_init(void)