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authorAndrey Ryabinin <aryabinin@virtuozzo.com>2018-07-17 19:00:34 +0300
committerMiklos Szeredi <mszeredi@redhat.com>2018-07-26 16:13:12 +0200
commitd6d931adce1193ef54d06fa9bbf58e5780ca516c (patch)
treecc055c3dc51301c32c998a5863dddfe25bd17938 /fs/fuse
parenta64ba10f65bfe2bead4693ef7fda9f7978dfa162 (diff)
fuse: use kvmalloc to allocate array of pipe_buffer structs.
The amount of pipe->buffers is basically controlled by userspace by fcntl(... F_SETPIPE_SZ ...) so it could be large. High order allocations could be slow (if memory is heavily fragmented) or may fail if the order is larger than PAGE_ALLOC_COSTLY_ORDER. Since the 'bufs' doesn't need to be physically contiguous, use the kvmalloc_array() to allocate memory. If high order page isn't available, the kvamalloc*() will fallback to 0-order. Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com> Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Diffstat (limited to 'fs/fuse')
-rw-r--r--fs/fuse/dev.c12
1 files changed, 6 insertions, 6 deletions
diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
index de3d273c9366..1050c1cc22fe 100644
--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -1373,8 +1373,8 @@ static ssize_t fuse_dev_splice_read(struct file *in, loff_t *ppos,
if (!fud)
return -EPERM;
- bufs = kmalloc_array(pipe->buffers, sizeof(struct pipe_buffer),
- GFP_KERNEL);
+ bufs = kvmalloc_array(pipe->buffers, sizeof(struct pipe_buffer),
+ GFP_KERNEL);
if (!bufs)
return -ENOMEM;
@@ -1407,7 +1407,7 @@ out:
for (; page_nr < cs.nr_segs; page_nr++)
put_page(bufs[page_nr].page);
- kfree(bufs);
+ kvfree(bufs);
return ret;
}
@@ -1957,8 +1957,8 @@ static ssize_t fuse_dev_splice_write(struct pipe_inode_info *pipe,
pipe_lock(pipe);
- bufs = kmalloc_array(pipe->buffers, sizeof(struct pipe_buffer),
- GFP_KERNEL);
+ bufs = kvmalloc_array(pipe->buffers, sizeof(struct pipe_buffer),
+ GFP_KERNEL);
if (!bufs) {
pipe_unlock(pipe);
return -ENOMEM;
@@ -2017,7 +2017,7 @@ static ssize_t fuse_dev_splice_write(struct pipe_inode_info *pipe,
pipe_buf_release(pipe, &bufs[idx]);
out:
- kfree(bufs);
+ kvfree(bufs);
return ret;
}