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Add readdir items

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Restore readdir functionality by adding readdir items.

The readdir items are keyed by an increasing position in the parent
dir's inode.  We track it in our inode info.  To delete the readdir
items we restore the dentry_info and put the pos in the dentry so unlink
can build the readdir item key.  And finally we put the pos in the
lookup dirent so that it can populate the dentry info on lookup.

Signed-off-by: Zach Brown <zab@versity.com>
This commit is contained in:
Zach Brown
2017-04-18 13:44:54 -07:00
parent 9a293bfa75
commit 67aec72c77
6 changed files with 170 additions and 36 deletions
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kmod/src/inode.c
+3
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@@ -125,6 +125,7 @@ static void load_inode(struct inode *inode, struct scoutfs_inode *cinode)
ci->salt = le32_to_cpu(cinode->salt);
atomic64_set(&ci->link_counter, le64_to_cpu(cinode->link_counter));
ci->data_version = le64_to_cpu(cinode->data_version);
ci->next_readdir_pos = le64_to_cpu(cinode->next_readdir_pos);
}
static void init_inode_key(struct scoutfs_key_buf *key,
@@ -245,6 +246,7 @@ static void store_inode(struct scoutfs_inode *cinode, struct inode *inode)
cinode->salt = cpu_to_le32(ci->salt);
cinode->link_counter = cpu_to_le64(atomic64_read(&ci->link_counter));
cinode->data_version = cpu_to_le64(ci->data_version);
cinode->next_readdir_pos = cpu_to_le64(ci->next_readdir_pos);
}
/*
@@ -407,6 +409,7 @@ struct inode *scoutfs_new_inode(struct super_block *sb, struct inode *dir,
ci->ino = ino;
seqcount_init(&ci->seqcount);
ci->data_version = 0;
ci->next_readdir_pos = SCOUTFS_DIRENT_FIRST_POS;
ci->staging = false;
get_random_bytes(&ci->salt, sizeof(ci->salt));
atomic64_set(&ci->link_counter, 0);