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kernel/file_cache: Fix writing zeros in the cache_io case.

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Should fix #16039 again.

Change-Id: I00c6566764a20e6ec5e8c99b0ebb2e304a5191ee
Reviewed-on: https://review.haiku-os.org/c/haiku/+/2855
Reviewed-by: waddlesplash <[email protected]>
This commit is contained in:
Augustin Cavalier
2020-05-31 21:52:10 +00:00
committed by waddlesplash
parent 92ed372680
commit 50c7fbacb7
1 changed files with 41 additions and 47 deletions
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src/system/kernel/cache/file_cache.cpp
Vendored
+41 -47
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@@ -628,6 +628,43 @@ write_to_cache(file_cache_ref* ref, void* cookie, off_t offset,
}
static status_t
write_zeros_to_file(struct vnode* vnode, void* cookie, off_t offset,
size_t* _size)
{
size_t size = *_size;
status_t status = B_OK;
while (size > 0) {
generic_size_t length = min_c(size, kZeroVecSize);
generic_io_vec* vecs = sZeroVecs;
generic_io_vec vec;
size_t count = kZeroVecCount;
if (length != kZeroVecSize) {
if (length > B_PAGE_SIZE) {
length = ROUNDDOWN(length, B_PAGE_SIZE);
count = length / B_PAGE_SIZE;
} else {
vec.base = sZeroPage;
vec.length = length;
vecs = &vec;
count = 1;
}
}
status = vfs_write_pages(vnode, cookie, offset,
vecs, count, B_PHYSICAL_IO_REQUEST, &length);
if (status != B_OK || length == 0)
break;
offset += length;
size -= length;
}
*_size = *_size - size;
return status;
}
static status_t
write_to_file(file_cache_ref* ref, void* cookie, off_t offset, int32 pageOffset,
addr_t buffer, size_t bufferSize, bool useBuffer,
@@ -640,18 +677,8 @@ write_to_file(file_cache_ref* ref, void* cookie, off_t offset, int32 pageOffset,
status_t status = B_OK;
if (!useBuffer) {
while (bufferSize > 0) {
generic_size_t written = min_c(bufferSize, kZeroVecSize);
status = vfs_write_pages(ref->vnode, cookie, offset + pageOffset,
sZeroVecs, kZeroVecCount, B_PHYSICAL_IO_REQUEST, &written);
if (status != B_OK)
return status;
if (written == 0)
return B_ERROR;
bufferSize -= written;
pageOffset += written;
}
status = write_zeros_to_file(ref->vnode, cookie, offset + pageOffset,
&bufferSize);
} else {
generic_io_vec vec;
vec.base = buffer;
@@ -1312,7 +1339,6 @@ file_cache_write(void* _cacheRef, void* cookie, off_t offset,
if (ref->disabled_count > 0) {
// Caching is disabled -- write directly to the file.
if (buffer != NULL) {
generic_io_vec vec;
vec.base = (addr_t)buffer;
@@ -1322,40 +1348,8 @@ file_cache_write(void* _cacheRef, void* cookie, off_t offset,
1, 0, &size);
*_size = size;
return error;
}
// NULL buffer -- use a dummy buffer to write zeroes
size_t size = *_size;
while (size > 0) {
generic_size_t length = min_c(size, kZeroVecSize);
generic_io_vec* vecs = sZeroVecs;
generic_io_vec vec;
size_t count = kZeroVecCount;
if ((length % B_PAGE_SIZE) != 0) {
if (length > B_PAGE_SIZE) {
length = ROUNDDOWN(length, B_PAGE_SIZE);
count = length / B_PAGE_SIZE;
} else {
vec.base = sZeroPage;
vec.length = length;
vecs = &vec;
count = 1;
}
}
status_t error = vfs_write_pages(ref->vnode, cookie, offset,
vecs, count, B_PHYSICAL_IO_REQUEST, &length);
if (error != B_OK)
return error;
if (length == 0)
break;
offset += length;
size -= length;
}
*_size -= size;
return B_OK;
} else
return write_zeros_to_file(ref->vnode, cookie, offset, _size);
}
status_t status = cache_io(ref, cookie, offset,