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authorMark Fasheh <mfasheh@suse.de>2013-02-04 20:54:57 +0000
committerJosef Bacik <jbacik@fusionio.com>2013-02-20 12:59:39 -0500
commitcb95e7bf7ba481c3d35b238b1cd671b63f54238a (patch)
tree0b2d4906688ca6447a191bcb5f6fe91e0628bda9
parent2f697dc6a648d3a16f512fe7a53281d55cce1570 (diff)
downloadop-kernel-dev-cb95e7bf7ba481c3d35b238b1cd671b63f54238a.zip
op-kernel-dev-cb95e7bf7ba481c3d35b238b1cd671b63f54238a.tar.gz
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 <mfasheh@suse.de> Signed-off-by: Josef Bacik <jbacik@fusionio.com>
-rw-r--r--fs/btrfs/send.c50
-rw-r--r--fs/btrfs/send.h1
-rw-r--r--include/uapi/linux/btrfs.h7
3 files changed, 54 insertions, 4 deletions
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);
diff --git a/fs/btrfs/send.h b/fs/btrfs/send.h
index 1bf4f32..8bb18f7 100644
--- a/fs/btrfs/send.h
+++ b/fs/btrfs/send.h
@@ -86,6 +86,7 @@ enum btrfs_send_cmd {
BTRFS_SEND_C_UTIMES,
BTRFS_SEND_C_END,
+ BTRFS_SEND_C_UPDATE_EXTENT,
__BTRFS_SEND_C_MAX,
};
#define BTRFS_SEND_C_MAX (__BTRFS_SEND_C_MAX - 1)
diff --git a/include/uapi/linux/btrfs.h b/include/uapi/linux/btrfs.h
index cffbb58..dd9f129 100644
--- a/include/uapi/linux/btrfs.h
+++ b/include/uapi/linux/btrfs.h
@@ -407,6 +407,13 @@ struct btrfs_ioctl_received_subvol_args {
__u64 reserved[16]; /* in */
};
+/*
+ * Caller doesn't want file data in the send stream, even if the
+ * search of clone sources doesn't find an extent. UPDATE_EXTENT
+ * commands will be sent instead of WRITE commands.
+ */
+#define BTRFS_SEND_FLAG_NO_FILE_DATA 0x1
+
struct btrfs_ioctl_send_args {
__s64 send_fd; /* in */
__u64 clone_sources_count; /* in */
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