Commit a9b2e0de authored by Omar Sandoval's avatar Omar Sandoval Committed by David Sterba

btrfs: send: get rid of i_size logic in send_write()

send_write()/fill_read_buf() have some logic for avoiding reading past
i_size. However, everywhere that we call
send_write()/send_extent_data(), we've already clamped the length down
to i_size. Get rid of the i_size handling, which simplifies the next
change.
Reviewed-by: default avatarFilipe Manana <fdmanana@suse.com>
Reviewed-by: default avatarJosef Bacik <josef@toxicpanda.com>
Signed-off-by: default avatarOmar Sandoval <osandov@fb.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent 0cbb5bdf
......@@ -4794,7 +4794,7 @@ static int process_all_new_xattrs(struct send_ctx *sctx)
return ret;
}
static ssize_t fill_read_buf(struct send_ctx *sctx, u64 offset, u32 len)
static int fill_read_buf(struct send_ctx *sctx, u64 offset, u32 len)
{
struct btrfs_root *root = sctx->send_root;
struct btrfs_fs_info *fs_info = root->fs_info;
......@@ -4804,21 +4804,13 @@ static ssize_t fill_read_buf(struct send_ctx *sctx, u64 offset, u32 len)
pgoff_t index = offset >> PAGE_SHIFT;
pgoff_t last_index;
unsigned pg_offset = offset_in_page(offset);
ssize_t ret = 0;
int ret = 0;
size_t read = 0;
inode = btrfs_iget(fs_info->sb, sctx->cur_ino, root);
if (IS_ERR(inode))
return PTR_ERR(inode);
if (offset + len > i_size_read(inode)) {
if (offset > i_size_read(inode))
len = 0;
else
len = offset - i_size_read(inode);
}
if (len == 0)
goto out;
last_index = (offset + len - 1) >> PAGE_SHIFT;
/* initial readahead */
......@@ -4859,16 +4851,15 @@ static ssize_t fill_read_buf(struct send_ctx *sctx, u64 offset, u32 len)
}
addr = kmap(page);
memcpy(sctx->read_buf + ret, addr + pg_offset, cur_len);
memcpy(sctx->read_buf + read, addr + pg_offset, cur_len);
kunmap(page);
unlock_page(page);
put_page(page);
index++;
pg_offset = 0;
len -= cur_len;
ret += cur_len;
read += cur_len;
}
out:
iput(inode);
return ret;
}
......@@ -4882,7 +4873,6 @@ static int send_write(struct send_ctx *sctx, u64 offset, u32 len)
struct btrfs_fs_info *fs_info = sctx->send_root->fs_info;
int ret = 0;
struct fs_path *p;
ssize_t num_read = 0;
p = fs_path_alloc();
if (!p)
......@@ -4890,12 +4880,9 @@ static int send_write(struct send_ctx *sctx, u64 offset, u32 len)
btrfs_debug(fs_info, "send_write offset=%llu, len=%d", offset, len);
num_read = fill_read_buf(sctx, offset, len);
if (num_read <= 0) {
if (num_read < 0)
ret = num_read;
ret = fill_read_buf(sctx, offset, len);
if (ret < 0)
goto out;
}
ret = begin_cmd(sctx, BTRFS_SEND_C_WRITE);
if (ret < 0)
......@@ -4907,16 +4894,14 @@ static int send_write(struct send_ctx *sctx, u64 offset, u32 len)
TLV_PUT_PATH(sctx, BTRFS_SEND_A_PATH, p);
TLV_PUT_U64(sctx, BTRFS_SEND_A_FILE_OFFSET, offset);
TLV_PUT(sctx, BTRFS_SEND_A_DATA, sctx->read_buf, num_read);
TLV_PUT(sctx, BTRFS_SEND_A_DATA, sctx->read_buf, len);
ret = send_cmd(sctx);
tlv_put_failure:
out:
fs_path_free(p);
if (ret < 0)
return ret;
return num_read;
}
/*
......@@ -5095,9 +5080,7 @@ static int send_extent_data(struct send_ctx *sctx,
ret = send_write(sctx, offset + sent, size);
if (ret < 0)
return ret;
if (!ret)
break;
sent += ret;
sent += size;
}
return 0;
}
......
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