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Message-Id: <1403474424-7555-1-git-send-email-yinghai@kernel.org> Date: Sun, 22 Jun 2014 15:00:24 -0700 From: Yinghai Lu <yinghai@...nel.org> To: Andrew Morton <akpm@...ux-foundation.org>, "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...e.hu> Cc: Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>, "Daniel M. Weeks" <dan@...weeks.net>, linux-kernel@...r.kernel.org, Yinghai Lu <yinghai@...nel.org> Subject: [PATCH v3] initramfs: Support initrd that is bigger than 2GiB 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. Signed-off-by: Yinghai Lu <yinghai@...nel.org> Acked-by: H. Peter Anvin <hpa@...or.com> --- 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); + long written = xwrite(fd, (char *)initrd_start, + initrd_end - initrd_start); + + if (written != initrd_end - initrd_start) + pr_err("/initrd.image: incomplete write (%ld != %ld)\n", + written, initrd_end - initrd_start); + sys_close(fd); free_initrd(); } -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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