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authorRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>2010-08-14 12:59:15 +0900
committerRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>2010-10-23 09:24:34 +0900
commitba65ae4729bf81c58d9fc847f67d57eec525b042 (patch)
tree6b2a4499a1e67bf858ce55cfe2e806b24c3697e7 /fs/nilfs2/namei.c
parent263d90cefc7d82a01c296c59532ff59d67c63509 (diff)
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nilfs2: add checkpoint tree to nilfs object
To hold multiple versions of a filesystem in one sb instance, a new on-memory structure is necessary to handle one or more checkpoints. This adds a red-black tree of checkpoints to nilfs object, and adds lookup and create functions for them. Each checkpoint is represented by "nilfs_root" structure, and this structure has rb_node to configure the rb-tree. The nilfs_root object is identified with a checkpoint number. For each snapshot, a nilfs_root object is allocated and the checkpoint number of snapshot is assigned to it. For a regular mount (i.e. current mode mount), NILFS_CPTREE_CURRENT_CNO constant is assigned to the corresponding nilfs_root object. Each nilfs_root object has an ifile inode and some counters. These items will displace those of nilfs_sb_info structure in successive patches. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Diffstat (limited to 'fs/nilfs2/namei.c')
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