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| author | Al Viro <viro@zeniv.linux.org.uk> | 2013-03-20 13:19:30 -0400 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2013-03-21 13:11:11 -0400 |
| commit | 06ae43f34bcc07a0b6be8bf78a1c895bcd12c839 (patch) | |
| tree | b74fe0c7e9370dfed956a1607dd10282c9ba1096 /fs/splice.c | |
| parent | f6161aa153581da4a3867a2d1a7caf4be19b6ec9 (diff) | |
| download | linux-0-day-06ae43f34bcc07a0b6be8bf78a1c895bcd12c839.tar.gz linux-0-day-06ae43f34bcc07a0b6be8bf78a1c895bcd12c839.tar.xz | |
Don't bother with redoing rw_verify_area() from default_file_splice_from()
default_file_splice_from() ends up calling vfs_write() (via very convoluted
callchain). It's an overkill, since we already have done rw_verify_area()
in the caller by the time we call vfs_write() we are under set_fs(KERNEL_DS),
so access_ok() is also pointless. Add a new helper (__kernel_write()),
use it instead of kernel_write() in there.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/splice.c')
| -rw-r--r-- | fs/splice.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/fs/splice.c b/fs/splice.c index 718bd00563846..29e394e49ddda 100644 --- a/fs/splice.c +++ b/fs/splice.c @@ -31,6 +31,7 @@ #include <linux/security.h> #include <linux/gfp.h> #include <linux/socket.h> +#include "internal.h" /* * Attempt to steal a page from a pipe buffer. This should perhaps go into @@ -1048,9 +1049,10 @@ static int write_pipe_buf(struct pipe_inode_info *pipe, struct pipe_buffer *buf, { int ret; void *data; + loff_t tmp = sd->pos; data = buf->ops->map(pipe, buf, 0); - ret = kernel_write(sd->u.file, data + buf->offset, sd->len, sd->pos); + ret = __kernel_write(sd->u.file, data + buf->offset, sd->len, &tmp); buf->ops->unmap(pipe, buf, data); return ret; |