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ext2: handle writec == 0

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Matheus
2024-08-14 17:35:42 -03:00
parent bf7851b352
commit f31d0255ae
1 changed files with 12 additions and 1 deletions
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kernel-src/fs/ext2.c
+12 -1
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@@ -1642,7 +1642,18 @@ static int ext2_putpage(vnode_t *node, uintmax_t offset, struct page_t *page) {
__assert(node->type == V_TYPE_REGULAR); __assert(node->type == V_TYPE_REGULAR);
size_t writec; size_t writec;
int error = VOP_WRITE(node, MAKE_HHDM(pmm_getpageaddress(page)), PAGE_SIZE, offset, 0, &writec, NULL); int error = VOP_WRITE(node, MAKE_HHDM(pmm_getpageaddress(page)), PAGE_SIZE, offset, 0, &writec, NULL);
__assert(writec != 0);
// its possible that writec is zero here. the condition where this is possible is when
// the file is truncated after the check in the page sync function but before it actually is
// written back to disk. therefore, we check that the page IS infact truncated if this happens.
// if it isn't, something else happened and its not safe to continue.
//
// TODO: since this check will likely be copied between different filesystem drivers, it could be interesting to have
// ext2_putpage take in a (size_t *) pointer and have this check be in whatever function calls VOP_PUTPAGE.
if (writec == 0) {
__assert(page->flags & PAGE_FLAGS_TRUNCATED);
}
return error; return error;
} }