5.4-stable review patch. If anyone has any objections, please let me know.
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From: Christoph Hellwig hch@lst.de
[ Upstream commit bf6419e4d5440c6d414a320506c5488857a5b001 ]
There is no good reason to mess with file descriptors from in-kernel code, switch the initramfs unpacking to struct file based write instead.
Signed-off-by: Christoph Hellwig hch@lst.de Acked-by: Linus Torvalds torvalds@linux-foundation.org Stable-dep-of: 4624b346cf67 ("init: open /initrd.image with O_LARGEFILE") Signed-off-by: Sasha Levin sashal@kernel.org --- init/initramfs.c | 47 ++++++++++++++++++++++++++--------------------- 1 file changed, 26 insertions(+), 21 deletions(-)
diff --git a/init/initramfs.c b/init/initramfs.c index 00a32799a38b0..1bc854fdf8302 100644 --- a/init/initramfs.c +++ b/init/initramfs.c @@ -11,13 +11,14 @@ #include <linux/utime.h> #include <linux/file.h>
-static ssize_t __init xwrite(int fd, const char *p, size_t count) +static ssize_t __init xwrite(struct file *file, const char *p, size_t count, + loff_t *pos) { ssize_t out = 0;
/* sys_write only can write MAX_RW_COUNT aka 2G-4K bytes at most */ while (count) { - ssize_t rv = ksys_write(fd, p, count); + ssize_t rv = kernel_write(file, p, count, pos);
if (rv < 0) { if (rv == -EINTR || rv == -EAGAIN) @@ -315,7 +316,8 @@ static int __init maybe_link(void) return 0; }
-static __initdata int wfd; +static __initdata struct file *wfile; +static __initdata loff_t wfile_pos;
static int __init do_name(void) { @@ -332,16 +334,17 @@ static int __init do_name(void) int openflags = O_WRONLY|O_CREAT; if (ml != 1) openflags |= O_TRUNC; - wfd = ksys_open(collected, openflags, mode); - - if (wfd >= 0) { - ksys_fchown(wfd, uid, gid); - ksys_fchmod(wfd, mode); - if (body_len) - ksys_ftruncate(wfd, body_len); - vcollected = kstrdup(collected, GFP_KERNEL); - state = CopyFile; - } + wfile = filp_open(collected, openflags, mode); + if (IS_ERR(wfile)) + return 0; + wfile_pos = 0; + + vfs_fchown(wfile, uid, gid); + vfs_fchmod(wfile, mode); + if (body_len) + vfs_truncate(&wfile->f_path, body_len); + vcollected = kstrdup(collected, GFP_KERNEL); + state = CopyFile; } } else if (S_ISDIR(mode)) { ksys_mkdir(collected, mode); @@ -363,16 +366,16 @@ static int __init do_name(void) static int __init do_copy(void) { if (byte_count >= body_len) { - if (xwrite(wfd, victim, body_len) != body_len) + if (xwrite(wfile, victim, body_len, &wfile_pos) != body_len) error("write error"); - ksys_close(wfd); + fput(wfile); do_utime(vcollected, mtime); kfree(vcollected); eat(body_len); state = SkipIt; return 0; } else { - if (xwrite(wfd, victim, byte_count) != byte_count) + if (xwrite(wfile, victim, byte_count, &wfile_pos) != byte_count) error("write error"); body_len -= byte_count; eat(byte_count); @@ -620,21 +623,23 @@ static inline void clean_rootfs(void) static void __init populate_initrd_image(char *err) { ssize_t written; - int fd; + struct file *file; + loff_t pos = 0;
unpack_to_rootfs(__initramfs_start, __initramfs_size);
printk(KERN_INFO "rootfs image is not initramfs (%s); looks like an initrd\n", err); - fd = ksys_open("/initrd.image", O_WRONLY | O_CREAT, 0700); - if (fd < 0) + file = filp_open("/initrd.image", O_WRONLY | O_CREAT, 0700); + if (IS_ERR(file)) return;
- written = xwrite(fd, (char *)initrd_start, initrd_end - initrd_start); + written = xwrite(file, (char *)initrd_start, initrd_end - initrd_start, + &pos); if (written != initrd_end - initrd_start) pr_err("/initrd.image: incomplete write (%zd != %ld)\n", written, initrd_end - initrd_start); - ksys_close(fd); + fput(file); } #else static void __init populate_initrd_image(char *err)