From 875c627c5f2045e2b5f0ad6692799e8fb931f3cb Mon Sep 17 00:00:00 2001 From: Wang Yugui Date: Wed, 19 Oct 2022 16:10:01 +0800 Subject: [PATCH] btrfs: send add define for v2 buffer size Add a define for the data buffer size (though the maximum size is not limited by it) BTRFS_SEND_BUF_SIZE_V2 so it's more visible. Signed-off-by: Wang Yugui Reviewed-by: David Sterba Signed-off-by: David Sterba --- fs/btrfs/send.c | 2 +- fs/btrfs/send.h | 6 ++++-- 2 files changed, 5 insertions(+), 3 deletions(-) diff --git a/fs/btrfs/send.c b/fs/btrfs/send.c index 1c4b693..80104b5 100644 --- a/fs/btrfs/send.c +++ b/fs/btrfs/send.c @@ -7901,7 +7901,7 @@ long btrfs_ioctl_send(struct inode *inode, struct btrfs_ioctl_send_args *arg) if (sctx->proto >= 2) { u32 send_buf_num_pages; - sctx->send_max_size = ALIGN(SZ_16K + BTRFS_MAX_COMPRESSED, PAGE_SIZE); + sctx->send_max_size = BTRFS_SEND_BUF_SIZE_V2; sctx->send_buf = vmalloc(sctx->send_max_size); if (!sctx->send_buf) { ret = -ENOMEM; diff --git a/fs/btrfs/send.h b/fs/btrfs/send.h index f7585cf..4f5509c 100644 --- a/fs/btrfs/send.h +++ b/fs/btrfs/send.h @@ -18,10 +18,12 @@ #endif /* - * In send stream v1, no command is larger than 64K. In send stream v2, no limit - * should be assumed. + * In send stream v1, no command is larger than 64K. In send stream v2, no + * limit should be assumed, the buffer size is set to be a header with + * compressed extent size. */ #define BTRFS_SEND_BUF_SIZE_V1 SZ_64K +#define BTRFS_SEND_BUF_SIZE_V2 ALIGN(SZ_16K + BTRFS_MAX_COMPRESSED, PAGE_SIZE) struct inode; struct btrfs_ioctl_send_args; -- 2.7.4