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api: storage: Add the missing write operation support

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API_dev_write(va_list ap) is currently lacking the write support
to storage devices because, historically, those devices did not
implement block_write()

The solution has been tested by loading and booting a (patched)
GRUB instance in a QEMU vexpress-a9 environment. The disk write
operations were triggered with GRUB's save_env command.

Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@gmail.com>
This commit is contained in:
Cristian Ciocaltea
2019-01-12 02:03:15 +02:00
committed by Tom Rini
parent 0be2ecd486
commit 036218a671
3 changed files with 63 additions and 21 deletions
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24
api/api_storage.c
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@@ -349,3 +349,27 @@ lbasize_t dev_read_stor(void *cookie, void *buf, lbasize_t len, lbastart_t start
return dd->block_read(dd, start, len, buf);
#endif /* defined(CONFIG_BLK) */
}
lbasize_t dev_write_stor(void *cookie, void *buf, lbasize_t len, lbastart_t start)
{
struct blk_desc *dd = (struct blk_desc *)cookie;
int type = dev_stor_type(dd);
if (type == ENUM_MAX)
return 0;
if (!dev_stor_is_valid(type, dd))
return 0;
#ifdef CONFIG_BLK
return blk_dwrite(dd, start, len, buf);
#else
if (dd->block_write == NULL) {
debugf("no block_write() for device 0x%08x\n", cookie);
return 0;
}
return dd->block_write(dd, start, len, buf);
#endif /* defined(CONFIG_BLK) */
}