Btrfs: extended inode refs support for send mechanism

This adds support for the new extended inode refs to btrfs send.

Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>

diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c
index 2bcbea3..b8b6926 100644 (file)
--- a/fs/btrfs/backref.c
+++ b/fs/btrfs/backref.c
@@ -1177,11 +1177,10 @@ int btrfs_find_one_extref(struct btrfs_root *root, u64 inode_objectid,
        return ret;
 }
 
-static char *ref_to_path(struct btrfs_root *fs_root,
-                        struct btrfs_path *path,
-                        u32 name_len, unsigned long name_off,
-                        struct extent_buffer *eb_in, u64 parent,
-                        char *dest, u32 size)
+char *btrfs_ref_to_path(struct btrfs_root *fs_root, struct btrfs_path *path,
+                       u32 name_len, unsigned long name_off,
+                       struct extent_buffer *eb_in, u64 parent,
+                       char *dest, u32 size)
 {
        int slot;
        u64 next_inum;
@@ -1266,10 +1265,10 @@ char *btrfs_iref_to_path(struct btrfs_root *fs_root,
                         struct extent_buffer *eb_in, u64 parent,
                         char *dest, u32 size)
 {
-       return ref_to_path(fs_root, path,
-                          btrfs_inode_ref_name_len(eb_in, iref),
-                          (unsigned long)(iref + 1),
-                          eb_in, parent, dest, size);
+       return btrfs_ref_to_path(fs_root, path,
+                                btrfs_inode_ref_name_len(eb_in, iref),
+                                (unsigned long)(iref + 1),
+                                eb_in, parent, dest, size);
 }
 
 /*
@@ -1715,9 +1714,8 @@ static int inode_to_path(u64 inum, u32 name_len, unsigned long name_off,
                                        ipath->fspath->bytes_left - s_ptr : 0;
 
        fspath_min = (char *)ipath->fspath->val + (i + 1) * s_ptr;
-       fspath = ref_to_path(ipath->fs_root, ipath->btrfs_path, name_len,
-                            name_off, eb, inum, fspath_min,
-                            bytes_left);
+       fspath = btrfs_ref_to_path(ipath->fs_root, ipath->btrfs_path, name_len,
+                                  name_off, eb, inum, fspath_min, bytes_left);
        if (IS_ERR(fspath))
                return PTR_ERR(fspath);
 

diff --git a/fs/btrfs/backref.h b/fs/btrfs/backref.h
index e755330..d61feca 100644 (file)
--- a/fs/btrfs/backref.h
+++ b/fs/btrfs/backref.h
@@ -62,6 +62,10 @@ int btrfs_find_all_roots(struct btrfs_trans_handle *trans,
 char *btrfs_iref_to_path(struct btrfs_root *fs_root, struct btrfs_path *path,
                         struct btrfs_inode_ref *iref, struct extent_buffer *eb,
                         u64 parent, char *dest, u32 size);
+char *btrfs_ref_to_path(struct btrfs_root *fs_root, struct btrfs_path *path,
+                       u32 name_len, unsigned long name_off,
+                       struct extent_buffer *eb_in, u64 parent,
+                       char *dest, u32 size);
 
 struct btrfs_data_container *init_data_container(u32 total_bytes);
 struct inode_fs_paths *init_ipath(s32 total_bytes, struct btrfs_root *fs_root,

diff --git a/fs/btrfs/send.c b/fs/btrfs/send.c
index c7beb54..4f20c49 100644 (file)
--- a/fs/btrfs/send.c
+++ b/fs/btrfs/send.c
@@ -745,31 +745,36 @@ typedef int (*iterate_inode_ref_t)(int num, u64 dir, int index,
                                   void *ctx);
 
 /*
- * Helper function to iterate the entries in ONE btrfs_inode_ref.
+ * Helper function to iterate the entries in ONE btrfs_inode_ref or
+ * btrfs_inode_extref.
  * The iterate callback may return a non zero value to stop iteration. This can
  * be a negative value for error codes or 1 to simply stop it.
  *
- * path must point to the INODE_REF when called.
+ * path must point to the INODE_REF or INODE_EXTREF when called.
  */
 static int iterate_inode_ref(struct send_ctx *sctx,
                             struct btrfs_root *root, struct btrfs_path *path,
                             struct btrfs_key *found_key, int resolve,
                             iterate_inode_ref_t iterate, void *ctx)
 {
-       struct extent_buffer *eb;
+       struct extent_buffer *eb = path->nodes[0];
        struct btrfs_item *item;
        struct btrfs_inode_ref *iref;
+       struct btrfs_inode_extref *extref;
        struct btrfs_path *tmp_path;
        struct fs_path *p;
-       u32 cur;
-       u32 len;
+       u32 cur = 0;
        u32 total;
-       int slot;
+       int slot = path->slots[0];
        u32 name_len;
        char *start;
        int ret = 0;
-       int num;
+       int num = 0;
        int index;
+       u64 dir;
+       unsigned long name_off;
+       unsigned long elem_size;
+       unsigned long ptr;
 
        p = fs_path_alloc_reversed(sctx);
        if (!p)
@@ -781,24 +786,40 @@ static int iterate_inode_ref(struct send_ctx *sctx,
                return -ENOMEM;
        }
 
-       eb = path->nodes[0];
-       slot = path->slots[0];
-       item = btrfs_item_nr(eb, slot);
-       iref = btrfs_item_ptr(eb, slot, struct btrfs_inode_ref);
-       cur = 0;
-       len = 0;
-       total = btrfs_item_size(eb, item);
 
-       num = 0;
+       if (found_key->type == BTRFS_INODE_REF_KEY) {
+               ptr = (unsigned long)btrfs_item_ptr(eb, slot,
+                                                   struct btrfs_inode_ref);
+               item = btrfs_item_nr(eb, slot);
+               total = btrfs_item_size(eb, item);
+               elem_size = sizeof(*iref);
+       } else {
+               ptr = btrfs_item_ptr_offset(eb, slot);
+               total = btrfs_item_size_nr(eb, slot);
+               elem_size = sizeof(*extref);
+       }
+
        while (cur < total) {
                fs_path_reset(p);
 
-               name_len = btrfs_inode_ref_name_len(eb, iref);
-               index = btrfs_inode_ref_index(eb, iref);
+               if (found_key->type == BTRFS_INODE_REF_KEY) {
+                       iref = (struct btrfs_inode_ref *)(ptr + cur);
+                       name_len = btrfs_inode_ref_name_len(eb, iref);
+                       name_off = (unsigned long)(iref + 1);
+                       index = btrfs_inode_ref_index(eb, iref);
+                       dir = found_key->offset;
+               } else {
+                       extref = (struct btrfs_inode_extref *)(ptr + cur);
+                       name_len = btrfs_inode_extref_name_len(eb, extref);
+                       name_off = (unsigned long)&extref->name;
+                       index = btrfs_inode_extref_index(eb, extref);
+                       dir = btrfs_inode_extref_parent(eb, extref);
+               }
+
                if (resolve) {
-                       start = btrfs_iref_to_path(root, tmp_path, iref, eb,
-                                               found_key->offset, p->buf,
-                                               p->buf_len);
+                       start = btrfs_ref_to_path(root, tmp_path, name_len,
+                                                 name_off, eb, dir,
+                                                 p->buf, p->buf_len);
                        if (IS_ERR(start)) {
                                ret = PTR_ERR(start);
                                goto out;
@@ -809,9 +830,10 @@ static int iterate_inode_ref(struct send_ctx *sctx,
                                                p->buf_len + p->buf - start);
                                if (ret < 0)
                                        goto out;
-                               start = btrfs_iref_to_path(root, tmp_path, iref,
-                                               eb, found_key->offset, p->buf,
-                                               p->buf_len);
+                               start = btrfs_ref_to_path(root, tmp_path,
+                                                         name_len, name_off,
+                                                         eb, dir,
+                                                         p->buf, p->buf_len);
                                if (IS_ERR(start)) {
                                        ret = PTR_ERR(start);
                                        goto out;
@@ -820,21 +842,16 @@ static int iterate_inode_ref(struct send_ctx *sctx,
                        }
                        p->start = start;
                } else {
-                       ret = fs_path_add_from_extent_buffer(p, eb,
-                                       (unsigned long)(iref + 1), name_len);
+                       ret = fs_path_add_from_extent_buffer(p, eb, name_off,
+                                                            name_len);
                        if (ret < 0)
                                goto out;
                }
 
-
-               len = sizeof(*iref) + name_len;
-               iref = (struct btrfs_inode_ref *)((char *)iref + len);
-               cur += len;
-
-               ret = iterate(num, found_key->offset, index, p, ctx);
+               cur += elem_size + name_len;
+               ret = iterate(num, dir, index, p, ctx);
                if (ret)
                        goto out;
-
                num++;
        }
 
@@ -998,7 +1015,8 @@ static int get_inode_path(struct send_ctx *sctx, struct btrfs_root *root,
        }
        btrfs_item_key_to_cpu(p->nodes[0], &found_key, p->slots[0]);
        if (found_key.objectid != ino ||
-               found_key.type != BTRFS_INODE_REF_KEY) {
+           (found_key.type != BTRFS_INODE_REF_KEY &&
+            found_key.type != BTRFS_INODE_EXTREF_KEY)) {
                ret = -ENOENT;
                goto out;
        }
@@ -1551,8 +1569,8 @@ static int get_first_ref(struct send_ctx *sctx,
        struct btrfs_key key;
        struct btrfs_key found_key;
        struct btrfs_path *path;
-       struct btrfs_inode_ref *iref;
        int len;
+       u64 parent_dir;
 
        path = alloc_path_for_send();
        if (!path)
@@ -1568,27 +1586,41 @@ static int get_first_ref(struct send_ctx *sctx,
        if (!ret)
                btrfs_item_key_to_cpu(path->nodes[0], &found_key,
                                path->slots[0]);
-       if (ret || found_key.objectid != key.objectid ||
-           found_key.type != key.type) {
+       if (ret || found_key.objectid != ino ||
+           (found_key.type != BTRFS_INODE_REF_KEY &&
+            found_key.type != BTRFS_INODE_EXTREF_KEY)) {
                ret = -ENOENT;
                goto out;
        }
 
-       iref = btrfs_item_ptr(path->nodes[0], path->slots[0],
-                       struct btrfs_inode_ref);
-       len = btrfs_inode_ref_name_len(path->nodes[0], iref);
-       ret = fs_path_add_from_extent_buffer(name, path->nodes[0],
-                       (unsigned long)(iref + 1), len);
+       if (key.type == BTRFS_INODE_REF_KEY) {
+               struct btrfs_inode_ref *iref;
+               iref = btrfs_item_ptr(path->nodes[0], path->slots[0],
+                                     struct btrfs_inode_ref);
+               len = btrfs_inode_ref_name_len(path->nodes[0], iref);
+               ret = fs_path_add_from_extent_buffer(name, path->nodes[0],
+                                                    (unsigned long)(iref + 1),
+                                                    len);
+               parent_dir = found_key.offset;
+       } else {
+               struct btrfs_inode_extref *extref;
+               extref = btrfs_item_ptr(path->nodes[0], path->slots[0],
+                                       struct btrfs_inode_extref);
+               len = btrfs_inode_extref_name_len(path->nodes[0], extref);
+               ret = fs_path_add_from_extent_buffer(name, path->nodes[0],
+                                       (unsigned long)&extref->name, len);
+               parent_dir = btrfs_inode_extref_parent(path->nodes[0], extref);
+       }
        if (ret < 0)
                goto out;
        btrfs_release_path(path);
 
-       ret = get_inode_info(root, found_key.offset, NULL, dir_gen, NULL, NULL,
+       ret = get_inode_info(root, parent_dir, NULL, dir_gen, NULL, NULL,
                        NULL, NULL);
        if (ret < 0)
                goto out;
 
-       *dir = found_key.offset;
+       *dir = parent_dir;
 
 out:
        btrfs_free_path(path);
@@ -3226,7 +3258,8 @@ static int process_all_refs(struct send_ctx *sctx,
                btrfs_item_key_to_cpu(eb, &found_key, slot);
 
                if (found_key.objectid != key.objectid ||
-                   found_key.type != key.type)
+                   (found_key.type != BTRFS_INODE_REF_KEY &&
+                    found_key.type != BTRFS_INODE_EXTREF_KEY))
                        break;
 
                ret = iterate_inode_ref(sctx, root, path, &found_key, 0, cb,
@@ -3987,7 +4020,7 @@ static int process_recorded_refs_if_needed(struct send_ctx *sctx, int at_end)
        if (sctx->cur_ino == 0)
                goto out;
        if (!at_end && sctx->cur_ino == sctx->cmp_key->objectid &&
-           sctx->cmp_key->type <= BTRFS_INODE_REF_KEY)
+           sctx->cmp_key->type <= BTRFS_INODE_EXTREF_KEY)
                goto out;
        if (list_empty(&sctx->new_refs) && list_empty(&sctx->deleted_refs))
                goto out;
@@ -4335,7 +4368,8 @@ static int changed_cb(struct btrfs_root *left_root,
 
        if (key->type == BTRFS_INODE_ITEM_KEY)
                ret = changed_inode(sctx, result);
-       else if (key->type == BTRFS_INODE_REF_KEY)
+       else if (key->type == BTRFS_INODE_REF_KEY ||
+                key->type == BTRFS_INODE_EXTREF_KEY)
                ret = changed_ref(sctx, result);
        else if (key->type == BTRFS_XATTR_ITEM_KEY)
                ret = changed_xattr(sctx, result);