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authorGeliang Tang <geliangtang@163.com>2016-02-18 17:04:22 +0300
committerKees Cook <keescook@chromium.org>2016-06-02 20:59:31 +0300
commit8cfc8ddc99df9509a46043b14af81f5c6a223eab (patch)
treefd5bb1b71a1c8418b672ccfa039babf84251b95a /fs/pstore/ram.c
parent235f6d157d43a761052e643b8799f86fdc87b47f (diff)
downloadlinux-8cfc8ddc99df9509a46043b14af81f5c6a223eab.tar.xz
pstore: add lzo/lz4 compression support
Like zlib compression in pstore, this patch added lzo and lz4 compression support so that users can have more options and better compression ratio. The original code treats the compressed data together with the uncompressed ECC correction notice by using zlib decompress. The ECC correction notice is missing in the decompression process. The treatment also makes lzo and lz4 not working. So I treat them separately by using pstore_decompress() to treat the compressed data, and memcpy() to treat the uncompressed ECC correction notice. Signed-off-by: Geliang Tang <geliangtang@163.com> Signed-off-by: Kees Cook <keescook@chromium.org>
Diffstat (limited to 'fs/pstore/ram.c')
-rw-r--r--fs/pstore/ram.c10
1 files changed, 5 insertions, 5 deletions
diff --git a/fs/pstore/ram.c b/fs/pstore/ram.c
index bd9812e83461..d9668c2b43cb 100644
--- a/fs/pstore/ram.c
+++ b/fs/pstore/ram.c
@@ -181,10 +181,10 @@ static bool prz_ok(struct persistent_ram_zone *prz)
static ssize_t ramoops_pstore_read(u64 *id, enum pstore_type_id *type,
int *count, struct timespec *time,
char **buf, bool *compressed,
+ ssize_t *ecc_notice_size,
struct pstore_info *psi)
{
ssize_t size;
- ssize_t ecc_notice_size;
struct ramoops_context *cxt = psi->data;
struct persistent_ram_zone *prz = NULL;
int header_length = 0;
@@ -229,16 +229,16 @@ static ssize_t ramoops_pstore_read(u64 *id, enum pstore_type_id *type,
size = persistent_ram_old_size(prz) - header_length;
/* ECC correction notice */
- ecc_notice_size = persistent_ram_ecc_string(prz, NULL, 0);
+ *ecc_notice_size = persistent_ram_ecc_string(prz, NULL, 0);
- *buf = kmalloc(size + ecc_notice_size + 1, GFP_KERNEL);
+ *buf = kmalloc(size + *ecc_notice_size + 1, GFP_KERNEL);
if (*buf == NULL)
return -ENOMEM;
memcpy(*buf, (char *)persistent_ram_old(prz) + header_length, size);
- persistent_ram_ecc_string(prz, *buf + size, ecc_notice_size + 1);
+ persistent_ram_ecc_string(prz, *buf + size, *ecc_notice_size + 1);
- return size + ecc_notice_size;
+ return size;
}
static size_t ramoops_write_kmsg_hdr(struct persistent_ram_zone *prz,