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nilfs2: make snapshots in checkpoint tree exportable

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The previous export operations cannot handle multiple versions of
a filesystem if they belong to the same sb instance.

This adds a new type of file handle and extends export operations so
that they can get the inode specified by a checkpoint number as well
as an inode number and a generation number.

Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
This commit is contained in:
Ryusuke Konishi 2010-08-27 00:23:02 +09:00
parent 4d8d9293dc
commit 8e656fd518
5 changed files with 151 additions and 71 deletions
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13
include/linux/exportfs.h
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@ -67,6 +67,19 @@ enum fid_type {
* 32 bit parent block number, 32 bit parent generation number
*/
FILEID_UDF_WITH_PARENT = 0x52,
/*
* 64 bit checkpoint number, 64 bit inode number,
* 32 bit generation number.
*/
FILEID_NILFS_WITHOUT_PARENT = 0x61,
/*
* 64 bit checkpoint number, 64 bit inode number,
* 32 bit generation number, 32 bit parent generation.
* 64 bit parent inode number.
*/
FILEID_NILFS_WITH_PARENT = 0x62,
};
struct fid {