From: WeiXiong Liao <liaoweixi...@allwinnertech.com> In order to configure itself, the MTD backend needs to be able to query the current pstore configuration. Introduce pstore_blk_usr_info() for this purpose.
Signed-off-by: WeiXiong Liao <liaoweixi...@allwinnertech.com> Link: https://lore.kernel.org/r/1585126506-18635-10-git-send-email-liaoweixi...@allwinnertech.com Signed-off-by: Kees Cook <keesc...@chromium.org> --- fs/pstore/blk.c | 37 ++++++++++++++++++++++++++++++------- include/linux/pstore_blk.h | 10 ++++++++++ 2 files changed, 40 insertions(+), 7 deletions(-) diff --git a/fs/pstore/blk.c b/fs/pstore/blk.c index 884b51e5879f..134c5e0c67c1 100644 --- a/fs/pstore/blk.c +++ b/fs/pstore/blk.c @@ -93,6 +93,17 @@ static struct bdev_info { sector_t start_sect; } g_bdev_info; +#define check_size(name, alignsize) ({ \ + long _##name_ = (name); \ + _##name_ = _##name_ <= 0 ? 0 : (_##name_ * 1024); \ + if (_##name_ & ((alignsize) - 1)) { \ + pr_info(#name " must align to %d\n", \ + (alignsize)); \ + _##name_ = ALIGN(name, (alignsize)); \ + } \ + _##name_; \ +}) + /** * struct psblk_device - back-end pstore/blk driver structure. * @@ -148,13 +159,11 @@ static int psblk_register_do(struct psblk_device *dev) dev->flags = UINT_MAX; #define verify_size(name, alignsize, enabled) { \ - long _##name_ = (enabled) ? (name) : 0; \ - _##name_ = _##name_ <= 0 ? 0 : (_##name_ * 1024); \ - if (_##name_ & ((alignsize) - 1)) { \ - pr_info(#name " must align to %d\n", \ - (alignsize)); \ - _##name_ = ALIGN(name, (alignsize)); \ - } \ + long _##name_; \ + if (enabled) \ + _##name_ = check_size(name, alignsize); \ + else \ + _##name_ = 0; \ name = _##name_ / 1024; \ pstore_zone_info->name = _##name_; \ } @@ -508,6 +517,20 @@ int psblk_blkdev_info(dev_t *devt, sector_t *nr_sects, sector_t *start_sect) } EXPORT_SYMBOL_GPL(psblk_blkdev_info); +/* get information of pstore/blk */ +int pstore_blk_usr_info(struct pstore_blk_info *info) +{ + strncpy(info->device, blkdev, 80); + info->max_reason = max_reason; + info->kmsg_size = check_size(kmsg_size, 4096); + info->pmsg_size = check_size(pmsg_size, 4096); + info->ftrace_size = check_size(ftrace_size, 4096); + info->console_size = check_size(console_size, 4096); + + return 0; +} +EXPORT_SYMBOL_GPL(pstore_blk_usr_info); + static void __exit pstore_blk_exit(void) { mutex_lock(&pstore_blk_lock); diff --git a/include/linux/pstore_blk.h b/include/linux/pstore_blk.h index 121b70e314a8..8aae922caa27 100644 --- a/include/linux/pstore_blk.h +++ b/include/linux/pstore_blk.h @@ -27,4 +27,14 @@ int register_pstore_blk(unsigned int major, unsigned int flags, void unregister_pstore_blk(unsigned int major); int psblk_blkdev_info(dev_t *devt, sector_t *nr_sects, sector_t *start_sect); +struct pstore_blk_info { + char device[80]; + enum kmsg_dump_reason max_reason; + unsigned long kmsg_size; + unsigned long pmsg_size; + unsigned long console_size; + unsigned long ftrace_size; +}; +int pstore_blk_usr_info(struct pstore_blk_info *info); + #endif -- 2.20.1
