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| author |   Catalin Marinas <catalin.marinas@arm.com> | 2012-09-19 12:01:52 +0100 |
|---|---|---|
| committer |   Al Viro <viro@zeniv.linux.org.uk> | 2012-10-02 21:35:55 -0400 |
| commit | 8f9c0119d7ba94c3ad13876acc240d7f12b6d8e1 (patch) | |
| tree | 44d618a21b60c5a268088bfae6c78c591f1e4334 /fs | |
| parent | fs: push rcu_barrier() from deactivate_locked_super() to filesystems (diff) | |
| download | linux-dev-8f9c0119d7ba94c3ad13876acc240d7f12b6d8e1.tar.xz linux-dev-8f9c0119d7ba94c3ad13876acc240d7f12b6d8e1.zip | |
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 <catalin.marinas@arm.com>
Acked-by: David S. Miller <davem@davemloft.net>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/compat.c | 22 | ||||
| -rw-r--r-- | fs/read_write.c | 4 | ||||
| -rw-r--r-- | fs/read_write.h | 2 |
3 files changed, 26 insertions, 2 deletions
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); |