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| author | Andrey Ryabinin <aryabinin@virtuozzo.com> | 2018-07-17 19:00:34 +0300 |
|---|---|---|
| committer | Miklos Szeredi <mszeredi@redhat.com> | 2018-07-26 16:13:12 +0200 |
| commit | d6d931adce1193ef54d06fa9bbf58e5780ca516c (patch) | |
| tree | cc055c3dc51301c32c998a5863dddfe25bd17938 /fs/fuse/dev.c | |
| parent | a64ba10f65bfe2bead4693ef7fda9f7978dfa162 (diff) | |
| download | linux-d6d931adce1193ef54d06fa9bbf58e5780ca516c.tar.gz linux-d6d931adce1193ef54d06fa9bbf58e5780ca516c.tar.bz2 linux-d6d931adce1193ef54d06fa9bbf58e5780ca516c.zip | |
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/dev.c')
| -rw-r--r-- | fs/fuse/dev.c | 12 |
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; } |