There is no good reason to mess with file descriptors from in-kernel code, switch the initramfs unpacking to struct file based write instead. As we don't have nice helper for chmod or chown on a struct file or struct path use the pathname based ones instead there. This causes additional (cached) lookups, but keeps the code much simpler.
Signed-off-by: Christoph Hellwig <[email protected]> --- fs/open.c | 7 +------ include/linux/syscalls.h | 1 - init/initramfs.c | 42 ++++++++++++++++++++-------------------- 3 files changed, 22 insertions(+), 28 deletions(-) diff --git a/fs/open.c b/fs/open.c index 6cd48a61cda3b9..6348173532e663 100644 --- a/fs/open.c +++ b/fs/open.c @@ -602,7 +602,7 @@ static int chmod_common(const struct path *path, umode_t mode) return error; } -int ksys_fchmod(unsigned int fd, umode_t mode) +SYSCALL_DEFINE2(fchmod, unsigned int, fd, umode_t, mode) { struct fd f = fdget(fd); int err = -EBADF; @@ -615,11 +615,6 @@ int ksys_fchmod(unsigned int fd, umode_t mode) return err; } -SYSCALL_DEFINE2(fchmod, unsigned int, fd, umode_t, mode) -{ - return ksys_fchmod(fd, mode); -} - int do_fchmodat(int dfd, const char __user *filename, umode_t mode) { struct path path; diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h index 005463f5acc23d..5215bd413b6eb1 100644 --- a/include/linux/syscalls.h +++ b/include/linux/syscalls.h @@ -1241,7 +1241,6 @@ int ksys_dup(unsigned int fildes); int ksys_chroot(const char __user *filename); ssize_t ksys_write(unsigned int fd, const char __user *buf, size_t count); int ksys_chdir(const char __user *filename); -int ksys_fchmod(unsigned int fd, umode_t mode); int ksys_fchown(unsigned int fd, uid_t user, gid_t group); int ksys_ioctl(unsigned int fd, unsigned int cmd, unsigned long arg); ssize_t ksys_read(unsigned int fd, char __user *buf, size_t count); diff --git a/init/initramfs.c b/init/initramfs.c index d42ec8329cd840..2d2f433ac7f01b 100644 --- a/init/initramfs.c +++ b/init/initramfs.c @@ -13,13 +13,13 @@ #include <linux/memblock.h> #include <linux/namei.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) { 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, &file->f_pos); if (rv < 0) { if (rv == -EINTR || rv == -EAGAIN) @@ -317,7 +317,7 @@ static int __init maybe_link(void) return 0; } -static __initdata int wfd; +static __initdata struct file *wfile; static int __init do_name(void) { @@ -334,16 +334,16 @@ 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; + + ksys_chown(collected, uid, gid); + ksys_chmod(collected, 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); @@ -365,16 +365,16 @@ 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) != 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) != byte_count) error("write error"); body_len -= byte_count; eat(byte_count); @@ -586,21 +586,21 @@ static void __init clean_rootfs(void) static void __init populate_initrd_image(char *err) { ssize_t written; - int fd; + struct file *file; 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); 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); } #endif /* CONFIG_BLK_DEV_RAM */ -- 2.26.2
