diff options
| author | WeiXiong Liao <liaoweixiong@allwinnertech.com> | 2020-03-25 16:55:00 +0800 |
|---|---|---|
| committer | Kees Cook <keescook@chromium.org> | 2020-05-30 10:34:03 -0700 |
| commit | cc9c4d1b5597167f8e8c92f6b61e1cda6d01884d (patch) | |
| tree | e85923479c50fbc727359bd5add5bfd5581ab040 /fs/pstore/blk.c | |
| parent | 0dc068265a1c5923ffebf40388fbe93050a77ad1 (diff) | |
pstore/zone,blk: Add console frontend support
Support backend for console. To enable console backend, just make
console_size be greater than 0 and a multiple of 4096.
Signed-off-by: WeiXiong Liao <liaoweixiong@allwinnertech.com>
Link: https://lore.kernel.org/lkml/20200511233229.27745-5-keescook@chromium.org/
Signed-off-by: Kees Cook <keescook@chromium.org>
Diffstat (limited to 'fs/pstore/blk.c')
| -rw-r--r-- | fs/pstore/blk.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/fs/pstore/blk.c b/fs/pstore/blk.c index a9e7078f08d6..082f6cdaf4bd 100644 --- a/fs/pstore/blk.c +++ b/fs/pstore/blk.c @@ -35,6 +35,14 @@ static long pmsg_size = -1; module_param(pmsg_size, long, 0400); MODULE_PARM_DESC(pmsg_size, "pmsg size in kbytes"); +#if IS_ENABLED(CONFIG_PSTORE_CONSOLE) +static long console_size = CONFIG_PSTORE_BLK_CONSOLE_SIZE; +#else +static long console_size = -1; +#endif +module_param(console_size, long, 0400); +MODULE_PARM_DESC(console_size, "console size in kbytes"); + /* * blkdev - the block device to use for pstore storage * @@ -91,7 +99,8 @@ struct bdev_info { * whole disk). * On success, the number of bytes should be returned, others * means error. - * @write: The same as @read. + * @write: The same as @read, but the following error number: + * -EBUSY means try to write again later. * @panic_write:The write operation only used for panic case. It's optional * if you do not care panic log. The parameters and return value * are the same as @read. @@ -142,6 +151,7 @@ static int psblk_register_do(struct pstore_device_info *dev) verify_size(kmsg_size, 4096, dev->flags & PSTORE_FLAGS_DMESG); verify_size(pmsg_size, 4096, dev->flags & PSTORE_FLAGS_PMSG); + verify_size(console_size, 4096, dev->flags & PSTORE_FLAGS_CONSOLE); #undef verify_size pstore_zone_info->total_size = dev->total_size; |