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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 <zab@redhat.com>
Signed-off-by: Chris Mason <clm@fb.com>
This commit is contained in:
Zach Brown 2014-05-09 17:15:08 -04:00 committed by Chris Mason
parent 98806b446d
commit 60e1975acb
2 changed files with 20 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
fs/btrfs/lzo.c
View File

@ -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;
}

26
fs/btrfs/zlib.c
View File

@ -98,7 +98,7 @@ static int zlib_compress_pages(struct list_head *ws,
if (Z_OK != zlib_deflateInit(&workspace->def_strm, 3)) {
printk(KERN_WARNING "BTRFS: deflateInit failed\n");
ret = -1;
ret = -EIO;
goto out;
}
@ -110,7 +110,7 @@ static int zlib_compress_pages(struct list_head *ws,
out_page = alloc_page(GFP_NOFS | __GFP_HIGHMEM);
if (out_page == NULL) {
ret = -1;
ret = -ENOMEM;
goto out;
}
cpage_out = kmap(out_page);
@ -128,7 +128,7 @@ static int zlib_compress_pages(struct list_head *ws,
printk(KERN_DEBUG "BTRFS: deflate in loop returned %d\n",
ret);
zlib_deflateEnd(&workspace->def_strm);
ret = -1;
ret = -EIO;
goto out;
}
@ -136,7 +136,7 @@ static int zlib_compress_pages(struct list_head *ws,
if (workspace->def_strm.total_in > 8192 &&
workspace->def_strm.total_in <
workspace->def_strm.total_out) {
ret = -1;
ret = -EIO;
goto out;
}
/* we need another page for writing out. Test this
@ -147,12 +147,12 @@ static int zlib_compress_pages(struct list_head *ws,
kunmap(out_page);
if (nr_pages == nr_dest_pages) {
out_page = NULL;
ret = -1;
ret = -E2BIG;
goto out;
}
out_page = alloc_page(GFP_NOFS | __GFP_HIGHMEM);
if (out_page == NULL) {
ret = -1;
ret = -ENOMEM;
goto out;
}
cpage_out = kmap(out_page);
@ -188,12 +188,12 @@ static int zlib_compress_pages(struct list_head *ws,
zlib_deflateEnd(&workspace->def_strm);
if (ret != Z_STREAM_END) {
ret = -1;
ret = -EIO;
goto out;
}
if (workspace->def_strm.total_out >= workspace->def_strm.total_in) {
ret = -1;
ret = -E2BIG;
goto out;
}
@ -253,7 +253,7 @@ static int zlib_decompress_biovec(struct list_head *ws, struct page **pages_in,
if (Z_OK != zlib_inflateInit2(&workspace->inf_strm, wbits)) {
printk(KERN_WARNING "BTRFS: inflateInit failed\n");
return -1;
return -EIO;
}
while (workspace->inf_strm.total_in < srclen) {
ret = zlib_inflate(&workspace->inf_strm, Z_NO_FLUSH);
@ -295,7 +295,7 @@ static int zlib_decompress_biovec(struct list_head *ws, struct page **pages_in,
}
}
if (ret != Z_STREAM_END)
ret = -1;
ret = -EIO;
else
ret = 0;
done:
@ -337,7 +337,7 @@ static int zlib_decompress(struct list_head *ws, unsigned char *data_in,
if (Z_OK != zlib_inflateInit2(&workspace->inf_strm, wbits)) {
printk(KERN_WARNING "BTRFS: inflateInit failed\n");
return -1;
return -EIO;
}
while (bytes_left > 0) {
@ -354,7 +354,7 @@ static int zlib_decompress(struct list_head *ws, unsigned char *data_in,
total_out = workspace->inf_strm.total_out;
if (total_out == buf_start) {
ret = -1;
ret = -EIO;
break;
}
@ -382,7 +382,7 @@ next:
}
if (ret != Z_STREAM_END && bytes_left != 0)
ret = -1;
ret = -EIO;
else
ret = 0;