We need to invalidate an existing dcache entry after creating a new
snapshot or subvolume, because a negative dache entry will stop us from
accessing the new snapshot or subvolume.
---
ctree.h | 23 +++++++++++++++++++++++
inode.c | 4 ++++
transaction.c | 4 ++++
3 files changed, 31 insertions(+)
diff -r 4b7e2b315a32 ctree.h
--- a/ctree.h Thu May 29 10:31:43 2008 -0400
+++ b/ctree.h Sat May 31 19:10:37 2008 +0000
@@ -1326,6 +1326,29 @@
#endif
}
+/*
+ * Invalidate a single dcache entry at the root of the filesystem.
+ * Needed after creation of snapshot or subvolume.
+ */
+
+static inline void invalidate_dcache_root(struct btrfs_root *root, char *name)
{
+ struct dentry *alias, *entry;
+ struct qstr qstr;
+
+ alias = d_find_alias(root->fs_info->sb->s_root->d_inode);
+ if (alias) {
+ qstr.name = name;
+ qstr.len = strlen(qstr.name);
+ qstr.hash = full_name_hash(qstr.name, qstr.len);
+ entry = d_lookup(alias, &qstr);
+ dput(alias);
+ if (entry) {
+ d_invalidate(entry);
+ dput(entry);
+ }
+ }
+}
+
/* extent-tree.c */
u32 btrfs_count_snapshots_in_path(struct btrfs_root *root,
struct btrfs_path *count_path,
diff -r 4b7e2b315a32 inode.c
--- a/inode.c Thu May 29 10:31:43 2008 -0400
+++ b/inode.c Sat May 31 19:10:37 2008 +0000
@@ -2761,6 +2761,10 @@
ret = btrfs_update_inode(trans, new_root, inode);
if (ret)
goto fail;
+
+ /* Invalidate existing dcache entry for new subvolume. */
+ invalidate_dcache_root(root, name);
+
fail:
nr = trans->blocks_used;
err = btrfs_commit_transaction(trans, new_root);
diff -r 4b7e2b315a32 transaction.c
--- a/transaction.c Thu May 29 10:31:43 2008 -0400
+++ b/transaction.c Sat May 31 19:10:37 2008 +0000
@@ -604,6 +604,10 @@
ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root,
pending->name, strlen(pending->name), objectid,
root->fs_info->sb->s_root->d_inode->i_ino);
+
+ /* Invalidate existing dcache entry for new snapshot. */
+ invalidate_dcache_root(root, pending->name);
+
fail:
kfree(new_root_item);
return ret;
--
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