When initrd (compressed or not) is used, kernel report data corrupted
with /dev/ram0.
The root cause:
During initramfs checking, if it is initrd, it will be transferred to
/initrd.image with sys_write.
sys_write only support 2G-4K write, so if the initrd ram is more than
that, /initrd.image will not complete at all.
Add local xwrite to loop calling sys_write to workaround the
problem.
Also need to use xwrite in write_buffer() to handle:
image is uncompressed cpio and there is one big file (>2G) in it.
unpack_to_rootfs ===> write_buffer ===> actions[]/do_copy
At the same time, we don't need to worry about sys_read/sys_write in
do_mounts_rd.c::crd_load. As decompressor will have fill/flush and
local buffer that is smaller than 2G.
Test with uncompressed initrd, and compressed ones with gz, bz2, lzma,xz,
lzop.
-v2: according to HPA, change name to xwrite.
-v3: change xwrite to HPA's version. The normal behavior of xwrite(),
like fwrite() and write(), is to return the total number of bytes
written if any bytes are written at all.
-v4: change written tyep to ssize_t according to Geert Uytterhoeven.
Signed-off-by: Yinghai Lu <[email protected]>
Acked-by: H. Peter Anvin <[email protected]>
---
init/initramfs.c | 36 ++++++++++++++++++++++++++++++++----
1 file changed, 32 insertions(+), 4 deletions(-)
Index: linux-2.6/init/initramfs.c
===================================================================
--- linux-2.6.orig/init/initramfs.c
+++ linux-2.6/init/initramfs.c
@@ -19,6 +19,29 @@
#include <linux/syscalls.h>
#include <linux/utime.h>
+static ssize_t __init xwrite(int fd, const char *p, size_t count)
+{
+ ssize_t out = 0;
+
+ /* sys_write only can write MAX_RW_COUNT aka 2G-4K bytes at most */
+ while (count) {
+ ssize_t rv = sys_write(fd, p, count);
+
+ if (rv < 0) {
+ if (rv == -EINTR || rv == -EAGAIN)
+ continue;
+ return out ? out : rv;
+ } else if (rv == 0)
+ break;
+
+ p += rv;
+ out += rv;
+ count -= rv;
+ }
+
+ return out;
+}
+
static __initdata char *message;
static void __init error(char *x)
{
@@ -346,7 +369,7 @@ static int __init do_name(void)
static int __init do_copy(void)
{
if (count >= body_len) {
- sys_write(wfd, victim, body_len);
+ xwrite(wfd, victim, body_len);
sys_close(wfd);
do_utime(vcollected, mtime);
kfree(vcollected);
@@ -354,7 +377,7 @@ static int __init do_copy(void)
state = SkipIt;
return 0;
} else {
- sys_write(wfd, victim, count);
+ xwrite(wfd, victim, count);
body_len -= count;
eat(count);
return 1;
@@ -603,8 +626,13 @@ static int __init populate_rootfs(void)
fd = sys_open("/initrd.image",
O_WRONLY|O_CREAT, 0700);
if (fd >= 0) {
- sys_write(fd, (char *)initrd_start,
- initrd_end - initrd_start);
+ ssize_t written = xwrite(fd, (char *)initrd_start,
+ initrd_end - initrd_start);
+
+ if (written != initrd_end - initrd_start)
+ pr_err("/initrd.image: incomplete write (%zd != %ld)\n",
+ written, initrd_end - initrd_start);
+
sys_close(fd);
free_initrd();
}