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pipe: add pipe_buf_release() helper

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Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Miklos Szeredi 2016-09-27 10:45:12 +02:00 committed by Al Viro
parent 7bf2d1df80
commit a779638cf6
5 changed files with 25 additions and 22 deletions
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7
fs/fuse/dev.c
View File

@ -1985,10 +1985,9 @@ static ssize_t fuse_dev_splice_write(struct pipe_inode_info *pipe,
ret = fuse_dev_do_write(fud, &cs, len); ret = fuse_dev_do_write(fud, &cs, len);
for (idx = 0; idx < nbuf; idx++) { for (idx = 0; idx < nbuf; idx++)
struct pipe_buffer *buf = &bufs[idx]; pipe_buf_release(pipe, &bufs[idx]);
buf->ops->release(pipe, buf);
}
out: out:
kfree(bufs); kfree(bufs);
return ret; return ret;

5
fs/pipe.c
View File

@ -299,8 +299,7 @@ pipe_read(struct kiocb *iocb, struct iov_iter *to)
} }
if (!buf->len) { if (!buf->len) {
buf->ops = NULL; pipe_buf_release(pipe, buf);
ops->release(pipe, buf);
curbuf = (curbuf + 1) & (pipe->buffers - 1); curbuf = (curbuf + 1) & (pipe->buffers - 1);
pipe->curbuf = curbuf; pipe->curbuf = curbuf;
pipe->nrbufs = --bufs; pipe->nrbufs = --bufs;
@ -664,7 +663,7 @@ void free_pipe_info(struct pipe_inode_info *pipe)
for (i = 0; i < pipe->buffers; i++) { for (i = 0; i < pipe->buffers; i++) {
struct pipe_buffer *buf = pipe->bufs + i; struct pipe_buffer *buf = pipe->bufs + i;
if (buf->ops) if (buf->ops)
buf->ops->release(pipe, buf); pipe_buf_release(pipe, buf);
} }
if (pipe->tmp_page) if (pipe->tmp_page)
__free_page(pipe->tmp_page); __free_page(pipe->tmp_page);

17
fs/splice.c
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@ -238,8 +238,7 @@ ssize_t add_to_pipe(struct pipe_inode_info *pipe, struct pipe_buffer *buf)
pipe->nrbufs++; pipe->nrbufs++;
return buf->len; return buf->len;
} }
buf->ops->release(pipe, buf); pipe_buf_release(pipe, buf);
buf->ops = NULL;
return ret; return ret;
} }
EXPORT_SYMBOL(add_to_pipe); EXPORT_SYMBOL(add_to_pipe);
@ -516,7 +515,6 @@ static int splice_from_pipe_feed(struct pipe_inode_info *pipe, struct splice_des
while (pipe->nrbufs) { while (pipe->nrbufs) {
struct pipe_buffer *buf = pipe->bufs + pipe->curbuf; struct pipe_buffer *buf = pipe->bufs + pipe->curbuf;
const struct pipe_buf_operations *ops = buf->ops;
sd->len = buf->len; sd->len = buf->len;
if (sd->len > sd->total_len) if (sd->len > sd->total_len)
@ -542,8 +540,7 @@ static int splice_from_pipe_feed(struct pipe_inode_info *pipe, struct splice_des
sd->total_len -= ret; sd->total_len -= ret;
if (!buf->len) { if (!buf->len) {
buf->ops = NULL; pipe_buf_release(pipe, buf);
ops->release(pipe, buf);
pipe->curbuf = (pipe->curbuf + 1) & (pipe->buffers - 1); pipe->curbuf = (pipe->curbuf + 1) & (pipe->buffers - 1);
pipe->nrbufs--; pipe->nrbufs--;
if (pipe->files) if (pipe->files)
@ -789,11 +786,9 @@ iter_file_splice_write(struct pipe_inode_info *pipe, struct file *out,
while (ret) { while (ret) {
struct pipe_buffer *buf = pipe->bufs + pipe->curbuf; struct pipe_buffer *buf = pipe->bufs + pipe->curbuf;
if (ret >= buf->len) { if (ret >= buf->len) {
const struct pipe_buf_operations *ops = buf->ops;
ret -= buf->len; ret -= buf->len;
buf->len = 0; buf->len = 0;
buf->ops = NULL; pipe_buf_release(pipe, buf);
ops->release(pipe, buf);
pipe->curbuf = (pipe->curbuf + 1) & (pipe->buffers - 1); pipe->curbuf = (pipe->curbuf + 1) & (pipe->buffers - 1);
pipe->nrbufs--; pipe->nrbufs--;
if (pipe->files) if (pipe->files)
@ -1032,10 +1027,8 @@ ssize_t splice_direct_to_actor(struct file *in, struct splice_desc *sd,
for (i = 0; i < pipe->buffers; i++) { for (i = 0; i < pipe->buffers; i++) {
struct pipe_buffer *buf = pipe->bufs + i; struct pipe_buffer *buf = pipe->bufs + i;
if (buf->ops) { if (buf->ops)
buf->ops->release(pipe, buf); pipe_buf_release(pipe, buf);
buf->ops = NULL;
}
} }
if (!bytes) if (!bytes)

14
include/linux/pipe_fs_i.h
View File

@ -126,6 +126,20 @@ static inline void pipe_buf_get(struct pipe_inode_info *pipe,
buf->ops->get(pipe, buf); buf->ops->get(pipe, buf);
} }
/**
* pipe_buf_release - put a reference to a pipe_buffer
* @pipe: the pipe that the buffer belongs to
* @buf: the buffer to put a reference to
*/
static inline void pipe_buf_release(struct pipe_inode_info *pipe,
struct pipe_buffer *buf)
{
const struct pipe_buf_operations *ops = buf->ops;
buf->ops = NULL;
ops->release(pipe, buf);
}
/* Differs from PIPE_BUF in that PIPE_SIZE is the length of the actual /* Differs from PIPE_BUF in that PIPE_SIZE is the length of the actual
memory allocation, whereas PIPE_BUF makes atomicity guarantees. */ memory allocation, whereas PIPE_BUF makes atomicity guarantees. */
#define PIPE_SIZE PAGE_SIZE #define PIPE_SIZE PAGE_SIZE

4
lib/iov_iter.c
View File

@ -709,9 +709,7 @@ static void pipe_advance(struct iov_iter *i, size_t size)
int unused = (pipe->curbuf + pipe->nrbufs) & (pipe->buffers - 1); int unused = (pipe->curbuf + pipe->nrbufs) & (pipe->buffers - 1);
/* [curbuf,unused) is in use. Free [idx,unused) */ /* [curbuf,unused) is in use. Free [idx,unused) */
while (idx != unused) { while (idx != unused) {
buf = &pipe->bufs[idx]; pipe_buf_release(pipe, &pipe->bufs[idx]);
buf->ops->release(pipe, buf);
buf->ops = NULL;
idx = next_idx(idx, pipe); idx = next_idx(idx, pipe);
pipe->nrbufs--; pipe->nrbufs--;
} }