From b4c6f7b75ce9fa3bb78af314e1841af5716bb643 Mon Sep 17 00:00:00 2001 From: Eric Sandeen Date: Thu, 31 Jan 2013 00:54:52 +0000 Subject: btrfs: remove unused fd in btrfs_ioctl_send() All we do is set it to NULL and test it :) Signed-off-by: Eric Sandeen Signed-off-by: Josef Bacik --- fs/btrfs/send.c | 3 --- 1 file changed, 3 deletions(-) (limited to 'fs/btrfs/send.c') diff --git a/fs/btrfs/send.c b/fs/btrfs/send.c index 321b7fb..614da0d 100644 --- a/fs/btrfs/send.c +++ b/fs/btrfs/send.c @@ -4536,7 +4536,6 @@ long btrfs_ioctl_send(struct file *mnt_file, void __user *arg_) struct btrfs_fs_info *fs_info; struct btrfs_ioctl_send_args *arg = NULL; struct btrfs_key key; - struct file *filp = NULL; struct send_ctx *sctx = NULL; u32 i; u64 *clone_sources_tmp = NULL; @@ -4673,8 +4672,6 @@ long btrfs_ioctl_send(struct file *mnt_file, void __user *arg_) goto out; out: - if (filp) - fput(filp); kfree(arg); vfree(clone_sources_tmp); -- cgit v1.1 From cb95e7bf7ba481c3d35b238b1cd671b63f54238a Mon Sep 17 00:00:00 2001 From: Mark Fasheh Date: Mon, 4 Feb 2013 20:54:57 +0000 Subject: btrfs: add "no file data" flag to btrfs send ioctl This patch adds the flag, BTRFS_SEND_FLAG_NO_FILE_DATA to the btrfs send ioctl code. When this flag is set, the btrfs send code will never write file data into the stream (thus also avoiding expensive reads of that data in the first place). BTRFS_SEND_C_UPDATE_EXTENT commands will be sent (instead of BTRFS_SEND_C_WRITE) with an offset, length pair indicating the extent in question. This patch does not affect the operation of BTRFS_SEND_C_CLONE commands - they will continue to be sent when a search finds an appropriate extent to clone from. Signed-off-by: Mark Fasheh Signed-off-by: Josef Bacik --- fs/btrfs/send.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++---- 1 file changed, 46 insertions(+), 4 deletions(-) (limited to 'fs/btrfs/send.c') diff --git a/fs/btrfs/send.c b/fs/btrfs/send.c index 614da0d..68da757 100644 --- a/fs/btrfs/send.c +++ b/fs/btrfs/send.c @@ -85,6 +85,7 @@ struct send_ctx { u32 send_max_size; u64 total_send_size; u64 cmd_send_size[BTRFS_SEND_C_MAX + 1]; + u64 flags; /* 'flags' member of btrfs_ioctl_send_args is u64 */ struct vfsmount *mnt; @@ -3709,6 +3710,39 @@ out: return ret; } +/* + * Send an update extent command to user space. + */ +static int send_update_extent(struct send_ctx *sctx, + u64 offset, u32 len) +{ + int ret = 0; + struct fs_path *p; + + p = fs_path_alloc(sctx); + if (!p) + return -ENOMEM; + + ret = begin_cmd(sctx, BTRFS_SEND_C_UPDATE_EXTENT); + if (ret < 0) + goto out; + + ret = get_cur_path(sctx, sctx->cur_ino, sctx->cur_inode_gen, p); + if (ret < 0) + goto out; + + TLV_PUT_PATH(sctx, BTRFS_SEND_A_PATH, p); + TLV_PUT_U64(sctx, BTRFS_SEND_A_FILE_OFFSET, offset); + TLV_PUT_U64(sctx, BTRFS_SEND_A_SIZE, len); + + ret = send_cmd(sctx); + +tlv_put_failure: +out: + fs_path_free(sctx, p); + return ret; +} + static int send_write_or_clone(struct send_ctx *sctx, struct btrfs_path *path, struct btrfs_key *key, @@ -3744,7 +3778,11 @@ static int send_write_or_clone(struct send_ctx *sctx, goto out; } - if (!clone_root) { + if (clone_root) { + ret = send_clone(sctx, offset, len, clone_root); + } else if (sctx->flags & BTRFS_SEND_FLAG_NO_FILE_DATA) { + ret = send_update_extent(sctx, offset, len); + } else { while (pos < len) { l = len - pos; if (l > BTRFS_SEND_READ_SIZE) @@ -3757,10 +3795,7 @@ static int send_write_or_clone(struct send_ctx *sctx, pos += ret; } ret = 0; - } else { - ret = send_clone(sctx, offset, len, clone_root); } - out: return ret; } @@ -4560,6 +4595,11 @@ long btrfs_ioctl_send(struct file *mnt_file, void __user *arg_) goto out; } + if (arg->flags & ~BTRFS_SEND_FLAG_NO_FILE_DATA) { + ret = -EINVAL; + goto out; + } + sctx = kzalloc(sizeof(struct send_ctx), GFP_NOFS); if (!sctx) { ret = -ENOMEM; @@ -4571,6 +4611,8 @@ long btrfs_ioctl_send(struct file *mnt_file, void __user *arg_) INIT_RADIX_TREE(&sctx->name_cache, GFP_NOFS); INIT_LIST_HEAD(&sctx->name_cache_list); + sctx->flags = arg->flags; + sctx->send_filp = fget(arg->send_fd); if (IS_ERR(sctx->send_filp)) { ret = PTR_ERR(sctx->send_filp); -- cgit v1.1