[SCM] Hurd branch, master, updated. v0.7-25-g52b5c7e

[Justus Winter]

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- Log -----------------------------------------------------------------
commit 52b5c7e8db6e6742dd6d7bf1548c6d33e149f59a
Author: Justus Winter <address@hidden>
Date:   Wed Jun 24 02:30:01 2015 +0200

    libdiskfs: use ihash for the node cache
    
    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.

commit 315a491d390a26c668ede6c8fa703b7620c10d08
Author: Justus Winter <address@hidden>
Date:   Sun Nov 22 20:19:52 2015 +0100

    ext2fs: keep list of reusable disk cache entries
    
    This avoids a linear scan through the cache.
    
    *  ext2fs/ext2fs.h (struct disk_cache_info): New field 'next'.
    * ext2fs/pager.c (disk_cache_hint): Drop.
    (disk_cache_info_free, disk_cache_info_free_lock): New variables.
    (disk_cache_info_free_pop, disk_cache_info_free_push): New functions.
    (disk_cache_init): Adjust slightly.
    (disk_cache_block_ref): Use new functions.
    (disk_cache_block_deref): Likewise.

commit fe9ece07747eb7281e0749a3dde7c02267af8ae6
Author: Justus Winter <address@hidden>
Date:   Thu Nov 12 23:33:35 2015 +0100

    ext2fs: disable block cache debugging by default
    
    * ext2fs/ext2fs.h: Disable block cache debugging by default.
    * ext2fs/pager.c: Likewise.

commit 1b6d78a1a79afe79a71841d914a4e49d6eb9100c
Author: Justus Winter <address@hidden>
Date:   Thu Nov 12 23:22:13 2015 +0100

    ext2fs: improve the block cache
    
    * ext2fs/pager.c (disk_cache_block_ref): Improve the cache by using
    the new lookup and insertion functions that return and use a location
    pointer.

-----------------------------------------------------------------------

Summary of changes:
 ext2fs/ext2fs.h        |    5 +-
 ext2fs/pager.c         |   99 +++++++++++++++++++++++++++-----------------
 libdiskfs/Makefile     |    2 +-
 libdiskfs/diskfs.h     |    5 +-
 libdiskfs/node-cache.c |  107 +++++++++++++++++++++++-------------------------
 5 files changed, 119 insertions(+), 99 deletions(-)


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