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; 4) set inode otime. 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. Signed-off-by: Filipe David Borba Manana <fdman...@gmail.com> --- V2: A v2 stream is now only produced if the send ioctl caller passes in one of the new flags (BTRFS_SEND_FLAG_CALCULATE_DATA_SIZE | BTRFS_SEND_FLAG_SUPPORT_FALLOCATE) to avoid breaking old clients. V3: Removed BTRFS_SEND_FLAG_SUPPORT_FALLOCATE and added BTRFS_SEND_FLAG_STREAM_V2, added commands for inode set flags and otime. fs/btrfs/send.c | 7 ++++++- fs/btrfs/send.h | 21 ++++++++++++++++++++- include/uapi/linux/btrfs.h | 21 ++++++++++++++++++++- 3 files changed, 46 insertions(+), 3 deletions(-) diff --git a/fs/btrfs/send.c b/fs/btrfs/send.c index 289e9f3..7b4b0c3 100644 --- a/fs/btrfs/send.c +++ b/fs/btrfs/send.c @@ -632,7 +632,10 @@ 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); @@ -5554,6 +5557,8 @@ long btrfs_ioctl_send(struct file *mnt_file, void __user *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 48d425a..96f583c 100644 --- a/fs/btrfs/send.h +++ b/fs/btrfs/send.h @@ -20,7 +20,8 @@ #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 (1024 * 64) #define BTRFS_SEND_READ_SIZE (1024 * 48) @@ -87,6 +88,15 @@ 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_INODE_SET_FLAGS, + BTRFS_SEND_C_UTIMES2, /* Same as UTIMES, but it includes OTIME too. */ + __BTRFS_SEND_C_MAX, }; #define BTRFS_SEND_C_MAX (__BTRFS_SEND_C_MAX - 1) @@ -125,10 +135,19 @@ 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, /* 32 bits */ + BTRFS_SEND_A_INODE_FLAGS, /* 32 bits */ + __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, void __user *arg); #endif diff --git a/include/uapi/linux/btrfs.h b/include/uapi/linux/btrfs.h index b4d6909..8ab2761 100644 --- a/include/uapi/linux/btrfs.h +++ b/include/uapi/linux/btrfs.h @@ -464,10 +464,29 @@ 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 */ -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html