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drivers/bch: Add CONFIG_BCH_FORCE_INDIRECT

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This implements similar functionality than CONFIG_FAT_FORCE_INDIRECT
because in some use cases (e.g. when CONFIG_BUILD_KERNEL) it is not possible to
write directly from user buffer.

Signed-off-by: Jani Paalijarvi <jani.paalijarvi@unikie.com>
This commit is contained in:
Jani Paalijarvi
2025-04-02 10:02:26 +03:00
committed by Xiang Xiao
parent 95ba78e1bd
commit 02c9030e88
2 changed files with 54 additions and 2 deletions
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drivers/bch/Kconfig
+9
View File
@@ -34,4 +34,13 @@ config BCH_DEVICE_READONLY
---help---
Set bch devices read-only
config BCH_FORCE_INDIRECT
bool "Force indirect transfers in BCH"
default n
---help---
Force all data transfers in BCH to be indirect,
using an intermediate buffer.
This is needed because in some use cases (e.g. when CONFIG_BUILD_KERNEL)
it is not possible to write directly from user buffer.
endif # BCH
drivers/bch/bchlib_write.c
+45 -2
View File
@@ -56,7 +56,9 @@ ssize_t bchlib_write(FAR void *handle, FAR const char *buffer, off_t offset,
size_t len)
{
FAR struct bchlib_s *bch = (FAR struct bchlib_s *)handle;
#ifndef CONFIG_BCH_FORCE_INDIRECT
size_t nsectors;
#endif
size_t sector;
uint16_t sectoffset;
size_t nbytes;
@@ -121,8 +123,48 @@ ssize_t bchlib_write(FAR void *handle, FAR const char *buffer, off_t offset,
len -= nbytes;
}
/* Then write all of the full sectors following the partial sector
* directly from the user buffer.
/* Then write all of the full sectors following the partial sector.. */
#ifdef CONFIG_BCH_FORCE_INDIRECT
/* indirectly by using sector buffer.
*/
while (len > 0)
{
/* Read the sector into the sector buffer */
ret = bchlib_readsector(bch, sector);
if (ret < 0)
{
return ret;
}
/* Copy the data from the user buffer to the sector buffer */
nbytes = len > bch->sectsize ? bch->sectsize : len;
memcpy(bch->buffer, buffer, nbytes);
bch->dirty = true;
/* Write the sector back to the block device */
ret = bchlib_flushsector(bch, false);
if (ret < 0)
{
ferr("ERROR: Flush failed: %d\n", ret);
return ret;
}
/* Adjust pointers and counts */
buffer += nbytes;
len -= nbytes;
byteswritten += nbytes;
sector++;
}
#else
/* directly from the user buffer.
*/
if (len >= bch->sectsize)
@@ -189,6 +231,7 @@ ssize_t bchlib_write(FAR void *handle, FAR const char *buffer, off_t offset,
byteswritten += len;
}
#endif /* CONFIG_BCH_FORCE_INDIRECT */
return byteswritten;
}