src/sys/gnu/ext2fs/ext2_readwrite.c, branch releng/4.9

MFC ufs_readwrite.c 1.72, ext2_readwrite.c 1.20. Fix a data-consistency

2000-12-22T18:44:34Z

race between write() and mmap(). I know this will slow write-appends down a bit and I am researching a better solution, but the race needs to be fixed now.

MFC sequential write detection heuristic. This extends the sequential

2000-04-26T20:36:36Z

read heuristic to also cover sequential writes, causing write-behind to be used only for the sequential write case. This solves a number of performance issues with random writes to medium sized files using large block sizes, as occurs with DBM files.

More removals of vnode->v_lastr, replaced by preexisting seqcount

1999-09-20T23:27:58Z

heuristic to detect sequential operation. VM-related forced clustering code removed from ufs in preparation for a commit to vm/vm_fault.c that does it more generally. Reviewed by: David Greenman , Alan Cox

Don't set IN_ACCESS for requests to read 0 bytes or for unsuccessful reads.

1999-07-25T02:56:17Z

Translated from: similar fixes in ufs_readwrite.c rev.1.61. Things are simpler (but annoyingly different) here because there are no vm optimisations.

Don't pass unused unused timestamp args to UFS_UPDATE() or waste

1999-01-07T16:14:19Z

time initializing them. This almost finishes centralizing (in-core) timestamp updates in ufs_itimes().

Catch a few corner cases where FreeBSD differs enough from BSD 4.4 to

1998-07-08T01:04:33Z

confuse Soft updates.. Should solve several "dangling deps" panics.

Eradicate the variable "time" from the kernel, using various measures.

1998-03-30T09:56:58Z

"time" wasn't a atomic variable, so splfoo() protection were needed around any access to it, unless you just wanted the seconds part. Most uses of time.tv_sec now uses the new variable time_second instead. gettime() changed to getmicrotime(0. Remove a couple of unneeded splfoo() protections, the new getmicrotime() is atomic, (until Bruce sets a breakpoint in it). A couple of places needed random data, so use read_random() instead of mucking about with time which isn't random. Add a new nfs_curusec() function. Mark a couple of bogosities involving the now disappeard time variable. Update ffs_update() to avoid the weird "== &time" checks, by fixing the one remaining call that passwd &time as args. Change profiling in ncr.c to use ticks instead of time. Resolution is the same. Add new function "tvtohz()" to avoid the bogus "splfoo(), add time, call hzto() which subtracts time" sequences. Reviewed by: bde

Removed FreeBSD ifdefs.

1997-12-02T10:39:42Z

Another VFS cleanup "kilo commit"

1997-10-16T20:32:40Z

1. Remove VOP_UPDATE, it is (also) an UFS/{FFS,LFS,EXT2FS,MFS} intereface function, and now lives in the ufsmount structure. 2. Remove VOP_SEEK, it was unused. 3. Add mode default vops: VOP_ADVLOCK vop_einval VOP_CLOSE vop_null VOP_FSYNC vop_null VOP_IOCTL vop_enotty VOP_MMAP vop_einval VOP_OPEN vop_null VOP_PATHCONF vop_einval VOP_READLINK vop_einval VOP_REALLOCBLKS vop_eopnotsupp And remove identical functionality from filesystems 4. Add vop_stdpathconf, which returns the canonical stuff. Use it in the filesystems. (XXX: It's probably wrong that specfs and fifofs sets this vop, shouldn't it come from the "host" filesystem, for instance ufs or cd9660 ?) 5. Try to make system wide VOP functions have vop_* names. 6. Initialize the um_* vectors in LFS. (Recompile your LKMS!!!)

VFS mega cleanup commit (x/N)

1997-10-16T10:50:27Z

1. Add new file "sys/kern/vfs_default.c" where default actions for VOPs go. Implement proper defaults for ABORTOP, BWRITE, LEASE, POLL, REVOKE and STRATEGY. Various stuff spread over the entire tree belongs here. 2. Change VOP_BLKATOFF to a normal function in cd9660. 3. Kill VOP_BLKATOFF, VOP_TRUNCATE, VOP_VFREE, VOP_VALLOC. These are private interface functions between UFS and the underlying storage manager layer (FFS/LFS/MFS/EXT2FS). The functions now live in struct ufsmount instead. 4. Remove a kludge of VOP_ functions in all filesystems, that did nothing but obscure the simplicity and break the expandability. If a filesystem doesn't implement VOP_FOO, it shouldn't have an entry for it in its vnops table. The system will try to DTRT if it is not implemented. There are still some cruft left, but the bulk of it is done. 5. Fix another VCALL in vfs_cache.c (thanks Bruce!)