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btrfs: send add define for v2 buffer size

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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 <wangyugui@e16-tech.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Wang Yugui 2022-10-19 16:10:01 +08:00 committed by David Sterba
parent b307f06d37
commit 875c627c5f
2 changed files with 5 additions and 3 deletions
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2
fs/btrfs/send.c
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@ -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;

6
fs/btrfs/send.h
View File

@ -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;