Module Name: src
Committed By: perseant
Date: Mon Jan 2 22:10:45 UTC 2012
Modified Files:
src/sys/ufs/lfs: lfs.h lfs_bio.c lfs_extern.h lfs_segment.c lfs_subr.c
lfs_syscalls.c lfs_vfsops.c lfs_vnops.c
src/sys/ufs/ufs: inode.h ufs_readwrite.c
Log Message:
* Remove PGO_RECLAIM during lfs_putpages()' call to genfs_putpages(),
to avoid a live lock in the latter when reclaiming a vnode with
dirty pages.
* Add a new segment flag, SEGM_RECLAIM, to note when a segment is
being written for vnode reclamation, and record which inode is being
reclaimed, to aid in forensic debugging.
* Add a new segment flag, SEGM_SINGLE, so that opportunistic writes
can write a single segment's worth of blocks and then stop, rather
than writing all the way up to the cleaner's reserved number of
segments.
* Add assert statements to check mutex ownership is the way it ought
to be, mostly in lfs_putpages; fix problems uncovered by this.
* Don't clear VU_DIROP until the inode actually makes its way to disk,
avoiding a problem where dirop inodes could become separated
(uncovered by a modified version of the "ckckp" forensic regression
test).
* Move the vfs_getopsbyname() call into lfs_writerd. Prepare code to
make lfs_writerd notice when there are no more LFSs, and exit losing
the reference, so that, in theory, the module can be unloaded. This
code is not enabled, since it causes a crash on exit.
* Set IN_MODIFIED on inodes flushed by lfs_flush_dirops. Really we
only need to set IN_MODIFIED if we are going to write them again
(e.g., to write pages); need to think about this more.
Finally, several changes to help avoid "no clean segments" panics:
* In lfs_bmapv, note when a vnode is loaded only to discover whether
its blocks are live, so it can immediately be recycled. Since the
cleaner will try to choose ~empty segments over full ones, this
prevents the cleaner from (1) filling the vnode cache with junk, and
(2) squeezing any unwritten writes to disk and running the fs out of
segments.
* Overestimate by half the amount of metadata that will be required
to fill the clean segments. This will make the disk appear smaller,
but should help avoid a "no clean segments" panic.
* Rearrange lfs_writerd. In particular, lfs_writerd now pays
attention to the number of clean segments available, and holds off
writing until there is room.
To generate a diff of this commit:
cvs rdiff -u -r1.134 -r1.135 src/sys/ufs/lfs/lfs.h
cvs rdiff -u -r1.120 -r1.121 src/sys/ufs/lfs/lfs_bio.c
cvs rdiff -u -r1.96 -r1.97 src/sys/ufs/lfs/lfs_extern.h
cvs rdiff -u -r1.222 -r1.223 src/sys/ufs/lfs/lfs_segment.c
cvs rdiff -u -r1.76 -r1.77 src/sys/ufs/lfs/lfs_subr.c
cvs rdiff -u -r1.139 -r1.140 src/sys/ufs/lfs/lfs_syscalls.c
cvs rdiff -u -r1.291 -r1.292 src/sys/ufs/lfs/lfs_vfsops.c
cvs rdiff -u -r1.238 -r1.239 src/sys/ufs/lfs/lfs_vnops.c
cvs rdiff -u -r1.58 -r1.59 src/sys/ufs/ufs/inode.h
cvs rdiff -u -r1.100 -r1.101 src/sys/ufs/ufs/ufs_readwrite.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
