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pstore: Add file extension to pstore file if compressed

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In case decompression fails, add a ".enc.z" to indicate the file has
compressed data. This will help user space utilities to figure
out the file contents.

Signed-off-by: Aruna Balakrishnaiah <aruna@linux.vnet.ibm.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Tony Luck <tony.luck@intel.com>
This commit is contained in:
Aruna Balakrishnaiah 2013-08-16 13:53:39 -07:00 committed by Tony Luck
parent adb42f5e10
commit 9ad2cbe0a9
3 changed files with 10 additions and 6 deletions
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7
fs/pstore/inode.c
View file

@ -275,8 +275,8 @@ int pstore_is_mounted(void)
* Set the mtime & ctime to the date that this record was originally stored.
*/
int pstore_mkfile(enum pstore_type_id type, char *psname, u64 id, int count,
char *data, size_t size, struct timespec time,
struct pstore_info *psi)
char *data, bool compressed, size_t size,
struct timespec time, struct pstore_info *psi)
{
struct dentry *root = pstore_sb->s_root;
struct dentry *dentry;
@ -315,7 +315,8 @@ int pstore_mkfile(enum pstore_type_id type, char *psname, u64 id, int count,
switch (type) {
case PSTORE_TYPE_DMESG:
sprintf(name, "dmesg-%s-%lld", psname, id);
sprintf(name, "dmesg-%s-%lld%s", psname, id,
compressed ? ".enc.z" : "");
break;
case PSTORE_TYPE_CONSOLE:
sprintf(name, "console-%s", psname);

5
fs/pstore/internal.h
View file

@ -50,8 +50,9 @@ extern struct pstore_info *psinfo;
extern void pstore_set_kmsg_bytes(int);
extern void pstore_get_records(int);
extern int pstore_mkfile(enum pstore_type_id, char *psname, u64 id,
int count, char *data, size_t size,
struct timespec time, struct pstore_info *psi);
int count, char *data, bool compressed,
size_t size, struct timespec time,
struct pstore_info *psi);
extern int pstore_is_mounted(void);
#endif

4
fs/pstore/platform.c
View file

@ -479,13 +479,15 @@ void pstore_get_records(int quiet)
if (unzipped_len > 0) {
buf = big_oops_buf;
size = unzipped_len;
compressed = false;
} else {
pr_err("pstore: decompression failed;"
"returned %d\n", unzipped_len);
compressed = true;
}
}
rc = pstore_mkfile(type, psi->name, id, count, buf,
(size_t)size, time, psi);
compressed, (size_t)size, time, psi);
if (unzipped_len < 0) {
/* Free buffer other than big oops */
kfree(buf);