From: Filipe David Borba Manana <fdman...@gmail.com>
This increases the send stream version from version 1 to version 2, adding
new commands:
1) total data size - used to tell the receiver how much file data the stream
will add or update;
2) fallocate - used to pre-allocate space for files and to punch holes in files;
3) inode set flags (chattr);
4) set inode otime;
5) sending compressed writes.
This is preparation work for subsequent changes that implement the new features.
A version 2 stream is only produced if the send ioctl caller passes in one of
the
new flags (BTRFS_SEND_FLAG_CALCULATE_DATA_SIZE | BTRFS_SEND_FLAG_STREAM_V2),
meaning
old clients are unaffected.
[Howard: rebased on 4.17-rc7]
Signed-off-by: Howard McLauchlan <hmclauch...@fb.com>
Signed-off-by: Filipe David Borba Manana <fdman...@gmail.com>
Reviewed-by: Omar Sandoval <osan...@fb.com>
---
fs/btrfs/send.c | 7 ++++++-
fs/btrfs/send.h | 22 +++++++++++++++++++++-
include/uapi/linux/btrfs.h | 21 ++++++++++++++++++++-
3 files changed, 47 insertions(+), 3 deletions(-)
diff --git a/fs/btrfs/send.c b/fs/btrfs/send.c
index c0074d2d7d6d..eccd69387065 100644
--- a/fs/btrfs/send.c
+++ b/fs/btrfs/send.c
@@ -649,7 +649,10 @@ static int send_header(struct send_ctx *sctx)
struct btrfs_stream_header hdr;
strcpy(hdr.magic, BTRFS_SEND_STREAM_MAGIC);
- hdr.version = cpu_to_le32(BTRFS_SEND_STREAM_VERSION);
+ if (sctx->flags & BTRFS_SEND_FLAG_STREAM_V2)
+ hdr.version = cpu_to_le32(BTRFS_SEND_STREAM_VERSION_2);
+ else
+ hdr.version = cpu_to_le32(BTRFS_SEND_STREAM_VERSION_1);
return write_buf(sctx->send_filp, &hdr, sizeof(hdr),
&sctx->send_off);
@@ -6535,6 +6538,8 @@ long btrfs_ioctl_send(struct file *mnt_file, struct
btrfs_ioctl_send_args *arg)
INIT_LIST_HEAD(&sctx->name_cache_list);
sctx->flags = arg->flags;
+ if (sctx->flags & BTRFS_SEND_FLAG_CALCULATE_DATA_SIZE)
+ sctx->flags |= BTRFS_SEND_FLAG_STREAM_V2;
sctx->send_filp = fget(arg->send_fd);
if (!sctx->send_filp) {
diff --git a/fs/btrfs/send.h b/fs/btrfs/send.h
index ead397f7034f..152180304078 100644
--- a/fs/btrfs/send.h
+++ b/fs/btrfs/send.h
@@ -10,7 +10,8 @@
#include "ctree.h"
#define BTRFS_SEND_STREAM_MAGIC "btrfs-stream"
-#define BTRFS_SEND_STREAM_VERSION 1
+#define BTRFS_SEND_STREAM_VERSION_1 1
+#define BTRFS_SEND_STREAM_VERSION_2 2
#define BTRFS_SEND_BUF_SIZE SZ_64K
#define BTRFS_SEND_READ_SIZE (48 * SZ_1K)
@@ -77,6 +78,16 @@ enum btrfs_send_cmd {
BTRFS_SEND_C_END,
BTRFS_SEND_C_UPDATE_EXTENT,
+
+ /*
+ * The following commands were added in stream version 2.
+ */
+ BTRFS_SEND_C_TOTAL_DATA_SIZE,
+ BTRFS_SEND_C_FALLOCATE,
+ BTRFS_SEND_C_CHATTR,
+ BTRFS_SEND_C_UTIMES2, /* Same as UTIMES, but it includes OTIME too. */
+ BTRFS_SEND_C_WRITE_COMPRESSED, /* to be implemented */
+
__BTRFS_SEND_C_MAX,
};
#define BTRFS_SEND_C_MAX (__BTRFS_SEND_C_MAX - 1)
@@ -115,10 +126,19 @@ enum {
BTRFS_SEND_A_CLONE_OFFSET,
BTRFS_SEND_A_CLONE_LEN,
+ /*
+ * The following attributes were added in stream version 2.
+ */
+ BTRFS_SEND_A_FALLOCATE_FLAGS,
+ BTRFS_SEND_A_CHATTR,
+
__BTRFS_SEND_A_MAX,
};
#define BTRFS_SEND_A_MAX (__BTRFS_SEND_A_MAX - 1)
+#define BTRFS_SEND_A_FALLOCATE_FLAG_KEEP_SIZE (1 << 0)
+#define BTRFS_SEND_A_FALLOCATE_FLAG_PUNCH_HOLE (1 << 1)
+
#ifdef __KERNEL__
long btrfs_ioctl_send(struct file *mnt_file, struct btrfs_ioctl_send_args
*arg);
#endif
diff --git a/include/uapi/linux/btrfs.h b/include/uapi/linux/btrfs.h
index c8d99b9ca550..ed63176660d2 100644
--- a/include/uapi/linux/btrfs.h
+++ b/include/uapi/linux/btrfs.h
@@ -711,10 +711,29 @@ struct btrfs_ioctl_received_subvol_args {
*/
#define BTRFS_SEND_FLAG_OMIT_END_CMD 0x4
+/*
+ * Calculate the amount (in bytes) of new file data between the send and
+ * parent snapshots, or in case of a full send, the total amount of file data
+ * we will send.
+ * This corresponds to the sum of the data lengths of each write, clone and
+ * fallocate commands that are sent through the send stream. The receiving end
+ * can use this information to compute progress.
+ *
+ * Added in send stream version 2, and implies producing a version 2 stream.
+ */
+#define BTRFS_SEND_FLAG_CALCULATE_DATA_SIZE 0x8
+
+/*
+ * Used by a client to request a version 2 of the send stream.
+ */
+#define BTRFS_SEND_FLAG_STREAM_V2 0x10
+
#define BTRFS_SEND_FLAG_MASK \
(BTRFS_SEND_FLAG_NO_FILE_DATA | \
BTRFS_SEND_FLAG_OMIT_STREAM_HEADER | \
- BTRFS_SEND_FLAG_OMIT_END_CMD)
+ BTRFS_SEND_FLAG_OMIT_END_CMD | \
+ BTRFS_SEND_FLAG_CALCULATE_DATA_SIZE | \
+ BTRFS_SEND_FLAG_STREAM_V2)
struct btrfs_ioctl_send_args {
__s64 send_fd; /* in */
--
2.17.0
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