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pstore/blk: Provide way to query pstore configuration

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In order to configure itself, the MTD backend needs to be able to query
the current pstore configuration. Introduce pstore_blk_get_config() for
this purpose.

Signed-off-by: WeiXiong Liao <liaoweixiong@allwinnertech.com>
Link: https://lore.kernel.org/lkml/20200511233229.27745-9-keescook@chromium.org/
Co-developed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
This commit is contained in:
WeiXiong Liao
2020-03-25 16:55:04 +08:00
committed by Kees Cook
parent 335426c6dc
commit 1525fb3bb6
2 changed files with 58 additions and 7 deletions
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37
fs/pstore/blk.c
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@@ -94,6 +94,17 @@ struct bdev_info {
sector_t start_sect;
};
#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 pstore_device_info - back-end pstore/blk driver structure.
*
@@ -149,13 +160,11 @@ static int psblk_register_do(struct pstore_device_info *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_; \
}
@@ -453,6 +462,20 @@ void unregister_pstore_blk(unsigned int major)
}
EXPORT_SYMBOL_GPL(unregister_pstore_blk);
/* get information of pstore/blk */
int pstore_blk_get_config(struct pstore_blk_config *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_get_config);
static void __exit pstore_blk_exit(void)
{
mutex_lock(&pstore_blk_lock);