| commit | 055f5ff8b5fd10006ff65698f619a74ce61e5fa8 | |
| author | Matthew Dillon <dillon@dragonflybsd.org> | |
| Thu, 10 Jan 2008 07:41:03 +0000 (10 07:41 +0000) | ||
| committer | Matthew Dillon <dillon@dragonflybsd.org> | |
| Thu, 10 Jan 2008 07:41:03 +0000 (10 07:41 +0000) | ||
| tree | d5de20e75b363afcefa732d1fde999da80e4c799 | treesnapshot (tar.gz zip) |
| parent | 4b958e7b1d7cced2b6068daed31a38464e05e2f0 | commitdiff |
HAMMER 17/many: Refactor IO backend, clean up buffer cache deadlocks.
Rewrite HAMMER's IO backend, sans locking which will occur in another patch.
The new backend is far less confusing though I wouldn't exactly call it
simple.
The new backend keeps track of dependancies with a structure->structure
dependancy list, plus implements the special case of opening and closing
a cluster header. Buffers are synchronized first, then cluster headers,
then volume headers. The new backend also removes a number of potential
deadlocks.
Rewrite HAMMER's IO backend, sans locking which will occur in another patch.
The new backend is far less confusing though I wouldn't exactly call it
simple.
The new backend keeps track of dependancies with a structure->structure
dependancy list, plus implements the special case of opening and closing
a cluster header. Buffers are synchronized first, then cluster headers,
then volume headers. The new backend also removes a number of potential
deadlocks.