src/sys/gnu/ext2fs/ext2_linux_ialloc.c, branch releng/4.9

MFC: ext2fs support on alpha. I have tested it using an ext2fs fs created

2001-08-14T18:03:19Z

by rh7.1 on alpha & it appears to work approved by: murray

MFC: $FreeBSD$

2000-08-03T00:54:41Z

Fix warnings in preparation for adding -Wall -Wcast-qual to the

1999-01-27T21:50:00Z

kernel compile

Quick fix for not being able to sync all the buffers in boot() if

1998-10-03T16:19:28Z

an ext2fs file system is mounted. The soft update changes added a check for B_DELWRI buffers. This exposed the complete brokenness of the previous quick fix for failing syncs (PR 3571, committed on 1997/08/04). Use a new buffer flag B_DIRTY and don't abuse B_DELWRI. B_DIRTY buffers are still written too late, as broken in the previous fix. This is fairly harmless, because B_DIRTY is only used for bitmap buffers and fsck.ext2 can fix up the bitmaps perfectly. Fixed a race in ULCK_BUF() (bremfree() was outside of the splbio() section).

Fixed printf format errors.

1998-07-11T07:46:16Z

Fixed (?) races in mark_buffer_dirty(). We abuse the buffer cache

1998-06-21T21:06:04Z

by hacking on locked buffers without getblk()ing them, and we didn't even use splbio() to prevent biodone() changing the buffer underneath use when a write completes. I think there was no problem in practice on i386's because the operations on b_flags and numdirtybufs happen to be atomic. We still depend on biodone()'s operations on b_flags not interfering with ours. I think there is only interference for B_ERROR, and this is harmless because errors for async writes are ignored anyway. Don't use mark_buffer_dirty() except for superblock-related metadata. It was used in just one case where ordinary BSD buffering is more natural.

Removed unused function ll_w_block(). It has always had races due

1998-06-21T19:56:31Z

to not using splbio(), and has rotted a little. The races were probably harmless in practice because this function was only used for superblock updates, and separate superblock updates are probably prevented from running into each other by doing part of the update synchronously.

Removed FreeBSD ifdefs.

1997-12-02T10:39:42Z

`numdirtybuffers' was not maintained properly. This caused excessive

1997-10-07T11:10:18Z

flushing of buffers in an attempt to reduce numdirtybuffers, and perhaps other problems.

Fix a problem with ext2fs so that filesystems mounted at reboot don't

1997-08-04T05:10:31Z

keep ahold of buffers, and therefore leave filesystems dirty. I haven't been able to test, but the code compiles. Those who run -current, please test and report back!!! (Sorry :-)). PR: kern/3571 Submitted by: Dirk Keunecke