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| author | Christoph Hellwig <hch@lst.de> | 2020-05-20 17:58:16 +0200 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2020-05-20 18:14:10 +0200 |
| commit | c928f642c29a5ffb02e16f2430b42b876dde69de (patch) | |
| tree | c3ccd9480d24d86420f191d5ea51281c99ba2de0 /fs/pipe.c | |
| parent | fs: make the pipe_buf_operations ->confirm operation optional (diff) | |
| download | linux-c928f642c29a5ffb02e16f2430b42b876dde69de.tar.xz linux-c928f642c29a5ffb02e16f2430b42b876dde69de.zip | |
fs: rename pipe_buf ->steal to ->try_steal
And replace the arcane return value convention with a simple bool
where true means success and false means failure.
[AV: braino fix folded in]
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/pipe.c')
| -rw-r--r-- | fs/pipe.c | 34 |
1 files changed, 16 insertions, 18 deletions
diff --git a/fs/pipe.c b/fs/pipe.c index 58890897402a..c7c4fb5f345f 100644 --- a/fs/pipe.c +++ b/fs/pipe.c @@ -140,21 +140,20 @@ static void anon_pipe_buf_release(struct pipe_inode_info *pipe, put_page(page); } -static int anon_pipe_buf_steal(struct pipe_inode_info *pipe, - struct pipe_buffer *buf) +static bool anon_pipe_buf_try_steal(struct pipe_inode_info *pipe, + struct pipe_buffer *buf) { struct page *page = buf->page; - if (page_count(page) == 1) { - memcg_kmem_uncharge_page(page, 0); - __SetPageLocked(page); - return 0; - } - return 1; + if (page_count(page) != 1) + return false; + memcg_kmem_uncharge_page(page, 0); + __SetPageLocked(page); + return true; } /** - * generic_pipe_buf_steal - attempt to take ownership of a &pipe_buffer + * generic_pipe_buf_try_steal - attempt to take ownership of a &pipe_buffer * @pipe: the pipe that the buffer belongs to * @buf: the buffer to attempt to steal * @@ -165,8 +164,8 @@ static int anon_pipe_buf_steal(struct pipe_inode_info *pipe, * he wishes; the typical use is insertion into a different file * page cache. */ -int generic_pipe_buf_steal(struct pipe_inode_info *pipe, - struct pipe_buffer *buf) +bool generic_pipe_buf_try_steal(struct pipe_inode_info *pipe, + struct pipe_buffer *buf) { struct page *page = buf->page; @@ -177,12 +176,11 @@ int generic_pipe_buf_steal(struct pipe_inode_info *pipe, */ if (page_count(page) == 1) { lock_page(page); - return 0; + return true; } - - return 1; + return false; } -EXPORT_SYMBOL(generic_pipe_buf_steal); +EXPORT_SYMBOL(generic_pipe_buf_try_steal); /** * generic_pipe_buf_get - get a reference to a &struct pipe_buffer @@ -216,9 +214,9 @@ void generic_pipe_buf_release(struct pipe_inode_info *pipe, EXPORT_SYMBOL(generic_pipe_buf_release); static const struct pipe_buf_operations anon_pipe_buf_ops = { - .release = anon_pipe_buf_release, - .steal = anon_pipe_buf_steal, - .get = generic_pipe_buf_get, + .release = anon_pipe_buf_release, + .try_steal = anon_pipe_buf_try_steal, + .get = generic_pipe_buf_get, }; /* Done while waiting without holding the pipe lock - thus the READ_ONCE() */ |