* own move/rename can be performed.
*/
struct rb_root waiting_dir_moves;
+
+ /*
+ * A directory that is going to be rm'ed might have a child directory
+ * which is in the pending directory moves index above. In this case,
+ * the directory can only be removed after the move/rename of its child
+ * is performed. Example:
+ *
+ * Parent snapshot:
+ *
+ * . (ino 256)
+ * |-- a/ (ino 257)
+ * |-- b/ (ino 258)
+ * |-- c/ (ino 259)
+ * | |-- x/ (ino 260)
+ * |
+ * |-- y/ (ino 261)
+ *
+ * Send snapshot:
+ *
+ * . (ino 256)
+ * |-- a/ (ino 257)
+ * |-- b/ (ino 258)
+ * |-- YY/ (ino 261)
+ * |-- x/ (ino 260)
+ *
+ * Sequence of steps that lead to the send snapshot:
+ * rm -f /a/b/c/foo.txt
+ * mv /a/b/y /a/b/YY
+ * mv /a/b/c/x /a/b/YY
+ * rmdir /a/b/c
+ *
+ * When the child is processed, its move/rename is delayed until its
+ * parent is processed (as explained above), but all other operations
+ * like update utimes, chown, chgrp, etc, are performed and the paths
+ * that it uses for those operations must use the orphanized name of
+ * its parent (the directory we're going to rm later), so we need to
+ * memorize that name.
+ *
+ * Indexed by the inode number of the directory to be deleted.
+ */
+ struct rb_root orphan_dirs;
};
struct pending_dir_move {
struct waiting_dir_move {
struct rb_node node;
u64 ino;
+ /*
+ * There might be some directory that could not be removed because it
+ * was waiting for this directory inode to be moved first. Therefore
+ * after this directory is moved, we can try to rmdir the ino rmdir_ino.
+ */
+ u64 rmdir_ino;
+};
+
+struct orphan_dir_info {
+ struct rb_node node;
+ u64 ino;
+ u64 gen;
};
struct name_cache_entry {
static int is_waiting_for_move(struct send_ctx *sctx, u64 ino);
+static struct waiting_dir_move *
+get_waiting_dir_move(struct send_ctx *sctx, u64 ino);
+
+static int is_waiting_for_rm(struct send_ctx *sctx, u64 dir_ino);
+
static int need_send_hole(struct send_ctx *sctx)
{
return (sctx->parent_root && !sctx->cur_inode_new &&
while (!stop && ino != BTRFS_FIRST_FREE_OBJECTID) {
fs_path_reset(name);
+ if (is_waiting_for_rm(sctx, ino)) {
+ ret = gen_unique_name(sctx, ino, gen, name);
+ if (ret < 0)
+ goto out;
+ ret = fs_path_add_path(dest, name);
+ break;
+ }
+
ret = __get_cur_name_and_parent(sctx, ino, gen, skip_name_cache,
&parent_inode, &parent_gen, name);
if (ret < 0)
return ret;
}
+static struct orphan_dir_info *
+add_orphan_dir_info(struct send_ctx *sctx, u64 dir_ino)
+{
+ struct rb_node **p = &sctx->orphan_dirs.rb_node;
+ struct rb_node *parent = NULL;
+ struct orphan_dir_info *entry, *odi;
+
+ odi = kmalloc(sizeof(*odi), GFP_NOFS);
+ if (!odi)
+ return ERR_PTR(-ENOMEM);
+ odi->ino = dir_ino;
+ odi->gen = 0;
+
+ while (*p) {
+ parent = *p;
+ entry = rb_entry(parent, struct orphan_dir_info, node);
+ if (dir_ino < entry->ino) {
+ p = &(*p)->rb_left;
+ } else if (dir_ino > entry->ino) {
+ p = &(*p)->rb_right;
+ } else {
+ kfree(odi);
+ return entry;
+ }
+ }
+
+ rb_link_node(&odi->node, parent, p);
+ rb_insert_color(&odi->node, &sctx->orphan_dirs);
+ return odi;
+}
+
+static struct orphan_dir_info *
+get_orphan_dir_info(struct send_ctx *sctx, u64 dir_ino)
+{
+ struct rb_node *n = sctx->orphan_dirs.rb_node;
+ struct orphan_dir_info *entry;
+
+ while (n) {
+ entry = rb_entry(n, struct orphan_dir_info, node);
+ if (dir_ino < entry->ino)
+ n = n->rb_left;
+ else if (dir_ino > entry->ino)
+ n = n->rb_right;
+ else
+ return entry;
+ }
+ return NULL;
+}
+
+static int is_waiting_for_rm(struct send_ctx *sctx, u64 dir_ino)
+{
+ struct orphan_dir_info *odi = get_orphan_dir_info(sctx, dir_ino);
+
+ return odi != NULL;
+}
+
+static void free_orphan_dir_info(struct send_ctx *sctx,
+ struct orphan_dir_info *odi)
+{
+ if (!odi)
+ return;
+ rb_erase(&odi->node, &sctx->orphan_dirs);
+ kfree(odi);
+}
+
/*
* Returns 1 if a directory can be removed at this point in time.
* We check this by iterating all dir items and checking if the inode behind
* the dir item was already processed.
*/
-static int can_rmdir(struct send_ctx *sctx, u64 dir, u64 send_progress)
+static int can_rmdir(struct send_ctx *sctx, u64 dir, u64 dir_gen,
+ u64 send_progress)
{
int ret = 0;
struct btrfs_root *root = sctx->parent_root;
goto out;
while (1) {
+ struct waiting_dir_move *dm;
+
if (path->slots[0] >= btrfs_header_nritems(path->nodes[0])) {
ret = btrfs_next_leaf(root, path);
if (ret < 0)
struct btrfs_dir_item);
btrfs_dir_item_key_to_cpu(path->nodes[0], di, &loc);
+ dm = get_waiting_dir_move(sctx, loc.objectid);
+ if (dm) {
+ struct orphan_dir_info *odi;
+
+ odi = add_orphan_dir_info(sctx, dir);
+ if (IS_ERR(odi)) {
+ ret = PTR_ERR(odi);
+ goto out;
+ }
+ odi->gen = dir_gen;
+ dm->rmdir_ino = dir;
+ ret = 0;
+ goto out;
+ }
+
if (loc.objectid > send_progress) {
ret = 0;
goto out;
static int is_waiting_for_move(struct send_ctx *sctx, u64 ino)
{
- struct rb_node *n = sctx->waiting_dir_moves.rb_node;
- struct waiting_dir_move *entry;
+ struct waiting_dir_move *entry = get_waiting_dir_move(sctx, ino);
- while (n) {
- entry = rb_entry(n, struct waiting_dir_move, node);
- if (ino < entry->ino)
- n = n->rb_left;
- else if (ino > entry->ino)
- n = n->rb_right;
- else
- return 1;
- }
- return 0;
+ return entry != NULL;
}
static int add_waiting_dir_move(struct send_ctx *sctx, u64 ino)
if (!dm)
return -ENOMEM;
dm->ino = ino;
+ dm->rmdir_ino = 0;
while (*p) {
parent = *p;
return 0;
}
-static int del_waiting_dir_move(struct send_ctx *sctx, u64 ino)
+static struct waiting_dir_move *
+get_waiting_dir_move(struct send_ctx *sctx, u64 ino)
{
struct rb_node *n = sctx->waiting_dir_moves.rb_node;
struct waiting_dir_move *entry;
while (n) {
entry = rb_entry(n, struct waiting_dir_move, node);
- if (ino < entry->ino) {
+ if (ino < entry->ino)
n = n->rb_left;
- } else if (ino > entry->ino) {
+ else if (ino > entry->ino)
n = n->rb_right;
- } else {
- rb_erase(&entry->node, &sctx->waiting_dir_moves);
- kfree(entry);
- return 0;
- }
+ else
+ return entry;
}
- return -ENOENT;
+ return NULL;
+}
+
+static void free_waiting_dir_move(struct send_ctx *sctx,
+ struct waiting_dir_move *dm)
+{
+ if (!dm)
+ return;
+ rb_erase(&dm->node, &sctx->waiting_dir_moves);
+ kfree(dm);
}
static int add_pending_dir_move(struct send_ctx *sctx, u64 parent_ino)
u64 orig_progress = sctx->send_progress;
struct recorded_ref *cur;
u64 parent_ino, parent_gen;
+ struct waiting_dir_move *dm = NULL;
+ u64 rmdir_ino = 0;
int ret;
name = fs_path_alloc();
goto out;
}
- ret = del_waiting_dir_move(sctx, pm->ino);
- ASSERT(ret == 0);
+ dm = get_waiting_dir_move(sctx, pm->ino);
+ ASSERT(dm);
+ rmdir_ino = dm->rmdir_ino;
+ free_waiting_dir_move(sctx, dm);
ret = get_first_ref(sctx->parent_root, pm->ino,
&parent_ino, &parent_gen, name);
if (ret < 0)
goto out;
+ if (rmdir_ino) {
+ struct orphan_dir_info *odi;
+
+ odi = get_orphan_dir_info(sctx, rmdir_ino);
+ if (!odi) {
+ /* already deleted */
+ goto finish;
+ }
+ ret = can_rmdir(sctx, rmdir_ino, odi->gen, sctx->cur_ino + 1);
+ if (ret < 0)
+ goto out;
+ if (!ret)
+ goto finish;
+
+ name = fs_path_alloc();
+ if (!name) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ ret = get_cur_path(sctx, rmdir_ino, odi->gen, name);
+ if (ret < 0)
+ goto out;
+ ret = send_rmdir(sctx, name);
+ if (ret < 0)
+ goto out;
+ free_orphan_dir_info(sctx, odi);
+ }
+
+finish:
ret = send_utimes(sctx, pm->ino, pm->gen);
if (ret < 0)
goto out;
* and old parent(s).
*/
list_for_each_entry(cur, &pm->update_refs, list) {
+ if (cur->dir == rmdir_ino)
+ continue;
ret = send_utimes(sctx, cur->dir, cur->dir_gen);
if (ret < 0)
goto out;
* later, we do this check again and rmdir it then if possible.
* See the use of check_dirs for more details.
*/
- ret = can_rmdir(sctx, sctx->cur_ino, sctx->cur_ino);
+ ret = can_rmdir(sctx, sctx->cur_ino, sctx->cur_inode_gen,
+ sctx->cur_ino);
if (ret < 0)
goto out;
if (ret) {
goto out;
} else if (ret == inode_state_did_delete &&
cur->dir != last_dir_ino_rm) {
- ret = can_rmdir(sctx, cur->dir, sctx->cur_ino);
+ ret = can_rmdir(sctx, cur->dir, cur->dir_gen,
+ sctx->cur_ino);
if (ret < 0)
goto out;
if (ret) {
sctx->pending_dir_moves = RB_ROOT;
sctx->waiting_dir_moves = RB_ROOT;
+ sctx->orphan_dirs = RB_ROOT;
sctx->clone_roots = vzalloc(sizeof(struct clone_root) *
(arg->clone_sources_count + 1));
kfree(dm);
}
+ WARN_ON(sctx && !ret && !RB_EMPTY_ROOT(&sctx->orphan_dirs));
+ while (sctx && !RB_EMPTY_ROOT(&sctx->orphan_dirs)) {
+ struct rb_node *n;
+ struct orphan_dir_info *odi;
+
+ n = rb_first(&sctx->orphan_dirs);
+ odi = rb_entry(n, struct orphan_dir_info, node);
+ free_orphan_dir_info(sctx, odi);
+ }
+
if (sort_clone_roots) {
for (i = 0; i < sctx->clone_roots_cnt; i++)
btrfs_root_dec_send_in_progress(
projects / openwrt / staging / blogic.git / commitdiff