From 60e1975acb48fc3d74a3422b21dde74c977ac3d5 Mon Sep 17 00:00:00 2001 From: Zach Brown Date: Fri, 9 May 2014 17:15:08 -0400 Subject: btrfs: return errno instead of -1 from compression The compression layer seems to have been built to return -1 and have callers make up errors that make sense. This isn't great because there are different errors that originate down in the compression layer. Let's return real negative errnos from the compression layer so that callers can pass on the error without having to guess what happened. ENOMEM for allocation failure, E2BIG when compression exceeds the uncompressed input, and EIO for everything else. This helps a future path return errors from btrfs_decompress(). Signed-off-by: Zach Brown Signed-off-by: Chris Mason --- fs/btrfs/lzo.c | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) (limited to 'fs/btrfs/lzo.c') diff --git a/fs/btrfs/lzo.c b/fs/btrfs/lzo.c index b47f669aca75..dfad8514f0da 100644 --- a/fs/btrfs/lzo.c +++ b/fs/btrfs/lzo.c @@ -143,7 +143,7 @@ static int lzo_compress_pages(struct list_head *ws, if (ret != LZO_E_OK) { printk(KERN_DEBUG "BTRFS: deflate in loop returned %d\n", ret); - ret = -1; + ret = -EIO; goto out; } @@ -189,7 +189,7 @@ static int lzo_compress_pages(struct list_head *ws, kunmap(out_page); if (nr_pages == nr_dest_pages) { out_page = NULL; - ret = -1; + ret = -E2BIG; goto out; } @@ -208,7 +208,7 @@ static int lzo_compress_pages(struct list_head *ws, /* we're making it bigger, give up */ if (tot_in > 8192 && tot_in < tot_out) { - ret = -1; + ret = -E2BIG; goto out; } @@ -335,7 +335,7 @@ cont: break; if (page_in_index + 1 >= total_pages_in) { - ret = -1; + ret = -EIO; goto done; } @@ -358,7 +358,7 @@ cont: kunmap(pages_in[page_in_index - 1]); if (ret != LZO_E_OK) { printk(KERN_WARNING "BTRFS: decompress failed\n"); - ret = -1; + ret = -EIO; break; } @@ -402,12 +402,12 @@ static int lzo_decompress(struct list_head *ws, unsigned char *data_in, ret = lzo1x_decompress_safe(data_in, in_len, workspace->buf, &out_len); if (ret != LZO_E_OK) { printk(KERN_WARNING "BTRFS: decompress failed!\n"); - ret = -1; + ret = -EIO; goto out; } if (out_len < start_byte) { - ret = -1; + ret = -EIO; goto out; } -- cgit