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work around copy_to_user failure on reads

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This commit is contained in:
Heikki Linnakangas
2025-05-21 16:33:52 +03:00
parent 14fefd261f
commit 7b818f8d64
1 changed files with 6 additions and 2 deletions
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8
pgxn/neon/file_cache.c
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@@ -1451,11 +1451,15 @@ pread_with_ioctl(void *buffer, uint64 blkno)
errno = 0;
elog(LOG, "calling ioctl read for blk %lu with buffer=%p (shared_buffers is at %p-%p)",
elog(DEBUG1, "calling ioctl read for blk %lu with buffer=%p (shared_buffers is at %p-%p)",
blkno,
buffer,
BufferBlocks,
BufferBlocks + BLCKSZ * NBuffers);
/* FIXME: touch the pages, so that copy_to_user doesn't fail in the kernel module */
((char *) buffer)[0] = 'x';
((char *) buffer)[4096] = 'x';
rc = ioctl(lfc_desc, NEON_IOCTL_READ, &args);
if (rc >= 0)
lfc_ctl->kernel_module_read_hits++;
@@ -1480,7 +1484,7 @@ pwrite_with_ioctl(const void *buffer, uint64 blkno)
};
int rc;
elog(LOG, "calling ioctl write for blk %lu with buffer=%p (shared_buffers is at %p-%p)",
elog(DEBUG1, "calling ioctl write for blk %lu with buffer=%p (shared_buffers is at %p-%p)",
blkno,
buffer,
BufferBlocks,