UbiquitousOS
/
OpenCloudOS-Kernel
mirror of https://gitee.com/OpenCloudOS/OpenCloudOS-Kernel.git
11
0
Fork 0
Code Issues Projects Releases Wiki Activity

btrfs: send: use helpers for unaligned access to header members 

The header is mapped onto the send buffer and thus its members may be
potentially unaligned so use the helpers instead of directly assigning
the pointers. This has worked so far but let's use the helpers to make
that clear.

Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2020-09-15 10:54:23 +02:00
parent 2c53a14dd3
commit e2f896b318
1 changed files with 7 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
fs/btrfs/send.c
View File

@ -577,8 +577,8 @@ static int tlv_put(struct send_ctx *sctx, u16 attr, const void *data, int len)
return -EOVERFLOW;
hdr = (struct btrfs_tlv_header *) (sctx->send_buf + sctx->send_size);
hdr->tlv_type = cpu_to_le16(attr);
hdr->tlv_len = cpu_to_le16(len);
put_unaligned_le16(attr, &hdr->tlv_type);
put_unaligned_le16(len, &hdr->tlv_len);
memcpy(hdr + 1, data, len);
sctx->send_size += total_len;
@ -688,7 +688,7 @@ static int begin_cmd(struct send_ctx *sctx, int cmd)
sctx->send_size += sizeof(*hdr);
hdr = (struct btrfs_cmd_header *)sctx->send_buf;
hdr->cmd = cpu_to_le16(cmd);
put_unaligned_le16(cmd, &hdr->cmd);
return 0;
}
@ -700,17 +700,17 @@ static int send_cmd(struct send_ctx *sctx)
u32 crc;
hdr = (struct btrfs_cmd_header *)sctx->send_buf;
hdr->len = cpu_to_le32(sctx->send_size - sizeof(*hdr));
hdr->crc = 0;
put_unaligned_le32(sctx->send_size - sizeof(*hdr), &hdr->len);
put_unaligned_le32(0, &hdr->crc);
crc = btrfs_crc32c(0, (unsigned char *)sctx->send_buf, sctx->send_size);
hdr->crc = cpu_to_le32(crc);
put_unaligned_le32(crc, &hdr->crc);
ret = write_buf(sctx->send_filp, sctx->send_buf, sctx->send_size,
&sctx->send_off);
sctx->total_send_size += sctx->send_size;
sctx->cmd_send_size[le16_to_cpu(hdr->cmd)] += sctx->send_size;
sctx->cmd_send_size[get_unaligned_le16(&hdr->cmd)] += sctx->send_size;
sctx->send_size = 0;
return ret;