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| author | Linus Torvalds <torvalds@g5.osdl.org> | 2006-04-02 12:46:35 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-04-02 12:46:35 -0700 |
| commit | 29e350944fdc2dfca102500790d8ad6d6ff4f69d (patch) | |
| tree | 7630809d75149b0053dcc45ad34e95d5506e88b3 /fs/splice.c | |
| parent | b45e516f701e0fc81fb3dbd1ba9db35f991a4465 (diff) | |
| download | lwn-29e350944fdc2dfca102500790d8ad6d6ff4f69d.tar.gz lwn-29e350944fdc2dfca102500790d8ad6d6ff4f69d.zip | |
splice: add SPLICE_F_NONBLOCK flag
It doesn't make the splice itself necessarily nonblocking (because the
actual file descriptors that are spliced from/to may block unless they
have the O_NONBLOCK flag set), but it makes the splice pipe operations
nonblocking.
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs/splice.c')
| -rw-r--r-- | fs/splice.c | 25 |
1 files changed, 21 insertions, 4 deletions
diff --git a/fs/splice.c b/fs/splice.c index 7c2bbf18d7a7..6081cf7d2d1b 100644 --- a/fs/splice.c +++ b/fs/splice.c @@ -106,7 +106,7 @@ static struct pipe_buf_operations page_cache_pipe_buf_ops = { static ssize_t move_to_pipe(struct inode *inode, struct page **pages, int nr_pages, unsigned long offset, - unsigned long len) + unsigned long len, unsigned int flags) { struct pipe_inode_info *info; int ret, do_wakeup, i; @@ -159,6 +159,12 @@ static ssize_t move_to_pipe(struct inode *inode, struct page **pages, break; } + if (flags & SPLICE_F_NONBLOCK) { + if (!ret) + ret = -EAGAIN; + break; + } + if (signal_pending(current)) { if (!ret) ret = -ERESTARTSYS; @@ -191,7 +197,7 @@ static ssize_t move_to_pipe(struct inode *inode, struct page **pages, } static int __generic_file_splice_read(struct file *in, struct inode *pipe, - size_t len) + size_t len, unsigned int flags) { struct address_space *mapping = in->f_mapping; unsigned int offset, nr_pages; @@ -279,7 +285,7 @@ static int __generic_file_splice_read(struct file *in, struct inode *pipe, * Now we splice them into the pipe.. */ splice_them: - return move_to_pipe(pipe, pages, i, offset, len); + return move_to_pipe(pipe, pages, i, offset, len, flags); } ssize_t generic_file_splice_read(struct file *in, struct inode *pipe, @@ -291,7 +297,7 @@ ssize_t generic_file_splice_read(struct file *in, struct inode *pipe, ret = 0; spliced = 0; while (len) { - ret = __generic_file_splice_read(in, pipe, len); + ret = __generic_file_splice_read(in, pipe, len, flags); if (ret <= 0) break; @@ -299,6 +305,11 @@ ssize_t generic_file_splice_read(struct file *in, struct inode *pipe, in->f_pos += ret; len -= ret; spliced += ret; + + if (!(flags & SPLICE_F_NONBLOCK)) + continue; + ret = -EAGAIN; + break; } if (spliced) @@ -527,6 +538,12 @@ static ssize_t move_from_pipe(struct inode *inode, struct file *out, break; } + if (flags & SPLICE_F_NONBLOCK) { + if (!ret) + ret = -EAGAIN; + break; + } + if (signal_pending(current)) { if (!ret) ret = -ERESTARTSYS; |