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libdiskfs' dosync goes through the cache to flush nodes to the disk.
We thus have to flush a node to the disk before removing it from the
cache in diskfs_try_dropping_softrefs.
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Our variants print stack traces on failures. This will make locating
errors much easier.
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Replace the hand-written hash table in the node cache with libihash.
Libihash is a self-tuning hash table, whereas the previous code used a
fixed number of buckets.
* libdiskfs/Makefile (HURDLIBS): Link to `ihash'.
* libdiskfs/diskfs.h (struct node): Remove bucket list, add slot pointer.
* libdiskfs/node-cache.c (nodecache): New ihash table replacing the
old `nodehash'.
(lookup): Drop function.
(diskfs_cached_lookup_context): Adapt accordingly.
(diskfs_cached_ifind): Likewise.
(diskfs_try_dropping_softrefs): Likewise.
(diskfs_node_iterate): Likewise.
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* libdiskfs/node-cache.c (diskfs_node_iterate): Do not print a message
on ENOMEM.
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Previously, all users of libdiskfs implemented a node cache on their
own. Move the node cache from ext2fs into libdiskfs. We preserve the
previous API by marking all functions that we pull from ext2fs as
weak, so that users like tmpfs can still implement their own node
cache.
* ext2fs/dir.c (diskfs_lookup_hard): Adjust accordingly.
* ext2fs/ext2fs.c (main): Don't call `inode_init'.
* ext2fs/ext2fs.h (struct disknode): Drop `hnext', `hprevp'.
* ext2fs/inode.c: Move the node cache into diskfs.
(diskfs_user_make_node): New function.
(diskfs_try_dropping_softrefs): Rename to `diskfs_user_try_dropping_softrefs'.
(read_node): Rename to `diskfs_user_read_node'. Also move a chunk of
code dealing with generations from `diskfs_cached_lookup' here.
* libdiskfs/Makefile (OTHERSRCS): Add `node-cache.c'.
* libdiskfs/diskfs.h (struct node): Add `hnext', `hprevp'.
Amend existing comments, add forward declarations.
* libdiskfs/node-cache.c: New file.
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