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vfs: vfs_read/vfs_write: accept user addresses

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Matheus
2024-09-18 19:18:15 -03:00
parent 947623b5f6
commit 7eb9955a96
1 changed files with 28 additions and 4 deletions
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kernel-src/fs/vfs.c
+28 -4
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@@ -229,6 +229,7 @@ static int writenocache(vnode_t *node, page_t *page, uintmax_t pageoffset) {
return e;
}
// buffer can be a user address
int vfs_write(vnode_t *node, void *buffer, size_t size, uintmax_t offset, size_t *written, int flags) {
int err = 0;
if (vfs_iscacheable(node)) {
@@ -291,7 +292,11 @@ int vfs_write(vnode_t *node, void *buffer, size_t size, uintmax_t offset, size_t
size_t writesize = min(PAGE_SIZE - startoffset, size);
void *address = MAKE_HHDM(pmm_getpageaddress(page));
memcpy((void *)((uintptr_t)address + startoffset), buffer, writesize);
err = USERCOPY_POSSIBLY_FROM_USER((void *)((uintptr_t)address + startoffset), buffer, writesize);
if (err) {
pmm_release(FROM_HHDM(address));
goto leave;
}
vmmcache_makedirty(page);
*written += writesize;
@@ -314,7 +319,13 @@ int vfs_write(vnode_t *node, void *buffer, size_t size, uintmax_t offset, size_t
size_t writesize = min(PAGE_SIZE, size - *written);
void *address = MAKE_HHDM(pmm_getpageaddress(page));
memcpy(address, (void *)((uintptr_t)buffer + *written), writesize);
err = USERCOPY_POSSIBLY_FROM_USER(address, (void *)((uintptr_t)buffer + *written), writesize);
if (err) {
pmm_release(FROM_HHDM(address));
goto leave;
}
vmmcache_makedirty(page);
*written += writesize;
@@ -394,7 +405,13 @@ int vfs_read(vnode_t *node, void *buffer, size_t size, uintmax_t offset, size_t
size_t readsize = min(PAGE_SIZE - startoffset, size);
void *address = MAKE_HHDM(pmm_getpageaddress(page));
memcpy(buffer, (void *)((uintptr_t)address + startoffset), readsize);
err = USERCOPY_POSSIBLY_TO_USER(buffer, (void *)((uintptr_t)address + startoffset), readsize);
if (err) {
pmm_release(FROM_HHDM(address));
goto leave;
}
*bytesread += readsize;
pageoffset += 1;
pagecount -= 1;
@@ -403,6 +420,7 @@ int vfs_read(vnode_t *node, void *buffer, size_t size, uintmax_t offset, size_t
// try to turn it into anonymous memory
vmmcache_evict(page);
}
pmm_release(FROM_HHDM(address));
}
@@ -414,7 +432,13 @@ int vfs_read(vnode_t *node, void *buffer, size_t size, uintmax_t offset, size_t
size_t readsize = min(PAGE_SIZE, size - *bytesread);
void *address = MAKE_HHDM(pmm_getpageaddress(page));
memcpy((void *)((uintptr_t)buffer + *bytesread), address, readsize);
err = USERCOPY_POSSIBLY_TO_USER((void *)((uintptr_t)buffer + *bytesread), address, readsize);
if (err) {
pmm_release(FROM_HHDM(address));
goto leave;
}
*bytesread += readsize;
if (flags & V_FFLAGS_NOCACHE) {
// try to turn it into anonymous memory