From 8f9c0119d7ba94c3ad13876acc240d7f12b6d8e1 Mon Sep 17 00:00:00 2001 From: Catalin Marinas Date: Wed, 19 Sep 2012 12:01:52 +0100 Subject: compat: fs: Generic compat_sys_sendfile implementation This function is used by sparc, powerpc and arm64 for compat support. The patch adds a generic implementation which calls do_sendfile() directly and avoids set_fs(). The sparc architecture has wrappers for the sign extensions while powerpc relies on the compiler to do the this. The patch adds wrappers for powerpc to handle the u32->int type conversion. compat_sys_sendfile64() can be replaced by a sys_sendfile() call since compat_loff_t has the same size as off_t on a 64-bit system. On powerpc, the patch also changes the 64-bit sendfile call from sys_sendile64 to sys_sendfile. Signed-off-by: Catalin Marinas Acked-by: David S. Miller Cc: Arnd Bergmann Cc: Benjamin Herrenschmidt Cc: Paul Mackerras Cc: Alexander Viro Cc: Andrew Morton Signed-off-by: Al Viro --- fs/compat.c | 22 ++++++++++++++++++++++ fs/read_write.c | 4 ++-- fs/read_write.h | 2 ++ 3 files changed, 26 insertions(+), 2 deletions(-) (limited to 'fs') diff --git a/fs/compat.c b/fs/compat.c index d72d51e19025..b7a24d0ca30d 100644 --- a/fs/compat.c +++ b/fs/compat.c @@ -1792,3 +1792,25 @@ compat_sys_open_by_handle_at(int mountdirfd, return do_handle_open(mountdirfd, handle, flags); } #endif + +#ifdef __ARCH_WANT_COMPAT_SYS_SENDFILE +asmlinkage long compat_sys_sendfile(int out_fd, int in_fd, + compat_off_t __user *offset, compat_size_t count) +{ + loff_t pos; + off_t off; + ssize_t ret; + + if (offset) { + if (unlikely(get_user(off, offset))) + return -EFAULT; + pos = off; + ret = do_sendfile(out_fd, in_fd, &pos, count, MAX_NON_LFS); + if (unlikely(put_user(pos, offset))) + return -EFAULT; + return ret; + } + + return do_sendfile(out_fd, in_fd, NULL, count, 0); +} +#endif /* __ARCH_WANT_COMPAT_SYS_SENDFILE */ diff --git a/fs/read_write.c b/fs/read_write.c index 28b38279a219..d06534857e9e 100644 --- a/fs/read_write.c +++ b/fs/read_write.c @@ -862,8 +862,8 @@ SYSCALL_DEFINE5(pwritev, unsigned long, fd, const struct iovec __user *, vec, return ret; } -static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos, - size_t count, loff_t max) +ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos, size_t count, + loff_t max) { struct fd in, out; struct inode *in_inode, *out_inode; diff --git a/fs/read_write.h b/fs/read_write.h index d07b954c6e0c..d3e00ef67420 100644 --- a/fs/read_write.h +++ b/fs/read_write.h @@ -12,3 +12,5 @@ ssize_t do_sync_readv_writev(struct file *filp, const struct iovec *iov, unsigned long nr_segs, size_t len, loff_t *ppos, iov_fn_t fn); ssize_t do_loop_readv_writev(struct file *filp, struct iovec *iov, unsigned long nr_segs, loff_t *ppos, io_fn_t fn); +ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos, size_t count, + loff_t max); -- cgit v1.2.3-59-g8ed1b