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authorUlf Lilleengen <lulf@FreeBSD.org>2010-01-14 14:30:54 +0000
committerUlf Lilleengen <lulf@FreeBSD.org>2010-01-14 14:30:54 +0000
commite09c00cadad669aaa347eb4064b4ebb068798bcf (patch)
treefef80ad74c782758cf935f5ae7b6be070319042e /sys/fs/ext2fs/ext2_balloc.c
parentc0d87a13b26cf3aaed0d19c29bf041de85f476db (diff)
downloadsrc-e09c00cadad669aaa347eb4064b4ebb068798bcf.tar.gz
src-e09c00cadad669aaa347eb4064b4ebb068798bcf.zip
Bring in the ext2fs work done by Aditya Sarawgi during and after Google Summer
of Code 2009: - BSDL block and inode allocation policies for ext2fs. This involves the use FFS1 style block and inode allocation for ext2fs. Preallocation was removed since it was GPL'd. - Make ext2fs MPSAFE by introducing locks to per-mount datastructures. - Fixes for kern/122047 PR. - Various small bugfixes. - Move out of gnu/ directory. Sponsored by: Google Inc. Submitted by: Aditya Sarawgi <sarawgi.aditya AT SPAMFREE gmail DOT com>
Notes
Notes: svn path=/head/; revision=202283
Diffstat (limited to 'sys/fs/ext2fs/ext2_balloc.c')
-rw-r--r--sys/fs/ext2fs/ext2_balloc.c292
1 files changed, 292 insertions, 0 deletions
diff --git a/sys/fs/ext2fs/ext2_balloc.c b/sys/fs/ext2fs/ext2_balloc.c
new file mode 100644
index 000000000000..124ac32ddf1c
--- /dev/null
+++ b/sys/fs/ext2fs/ext2_balloc.c
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+/*-
+ * modified for Lites 1.1
+ *
+ * Aug 1995, Godmar Back (gback@cs.utah.edu)
+ * University of Utah, Department of Computer Science
+ */
+/*-
+ * Copyright (c) 1982, 1986, 1989, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * @(#)ffs_balloc.c 8.4 (Berkeley) 9/23/93
+ * $FreeBSD$
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/bio.h>
+#include <sys/buf.h>
+#include <sys/lock.h>
+#include <sys/ucred.h>
+#include <sys/vnode.h>
+
+#include <fs/ext2fs/inode.h>
+#include <fs/ext2fs/ext2fs.h>
+#include <fs/ext2fs/fs.h>
+#include <fs/ext2fs/ext2_extern.h>
+#include <fs/ext2fs/ext2_mount.h>
+/*
+ * Balloc defines the structure of file system storage
+ * by allocating the physical blocks on a device given
+ * the inode and the logical block number in a file.
+ */
+int
+ext2_balloc(ip, lbn, size, cred, bpp, flags)
+ struct inode *ip;
+ int32_t lbn;
+ int size;
+ struct ucred *cred;
+ struct buf **bpp;
+ int flags;
+{
+ struct m_ext2fs *fs;
+ struct ext2mount *ump;
+ int32_t nb;
+ struct buf *bp, *nbp;
+ struct vnode *vp = ITOV(ip);
+ struct indir indirs[NIADDR + 2];
+ int32_t newb, *bap, pref;
+ int osize, nsize, num, i, error;
+
+ *bpp = NULL;
+ if (lbn < 0)
+ return (EFBIG);
+ fs = ip->i_e2fs;
+ ump = ip->i_ump;
+
+ /*
+ * check if this is a sequential block allocation.
+ * If so, increment next_alloc fields to allow ext2_blkpref
+ * to make a good guess
+ */
+ if (lbn == ip->i_next_alloc_block + 1) {
+ ip->i_next_alloc_block++;
+ ip->i_next_alloc_goal++;
+ }
+
+ /*
+ * The first NDADDR blocks are direct blocks
+ */
+ if (lbn < NDADDR) {
+ nb = ip->i_db[lbn];
+ /* no new block is to be allocated, and no need to expand
+ the file */
+ if (nb != 0 && ip->i_size >= (lbn + 1) * fs->e2fs_bsize) {
+ error = bread(vp, lbn, fs->e2fs_bsize, NOCRED, &bp);
+ if (error) {
+ brelse(bp);
+ return (error);
+ }
+ bp->b_blkno = fsbtodb(fs, nb);
+ *bpp = bp;
+ return (0);
+ }
+ if (nb != 0) {
+ /*
+ * Consider need to reallocate a fragment.
+ */
+ osize = fragroundup(fs, blkoff(fs, ip->i_size));
+ nsize = fragroundup(fs, size);
+ if (nsize <= osize) {
+ error = bread(vp, lbn, osize, NOCRED, &bp);
+ if (error) {
+ brelse(bp);
+ return (error);
+ }
+ bp->b_blkno = fsbtodb(fs, nb);
+ } else {
+ /* Godmar thinks: this shouldn't happen w/o fragments */
+ printf("nsize %d(%d) > osize %d(%d) nb %d\n",
+ (int)nsize, (int)size, (int)osize,
+ (int)ip->i_size, (int)nb);
+ panic(
+ "ext2_balloc: Something is terribly wrong");
+/*
+ * please note there haven't been any changes from here on -
+ * FFS seems to work.
+ */
+ }
+ } else {
+ if (ip->i_size < (lbn + 1) * fs->e2fs_bsize)
+ nsize = fragroundup(fs, size);
+ else
+ nsize = fs->e2fs_bsize;
+ EXT2_LOCK(ump);
+ error = ext2_alloc(ip, lbn,
+ ext2_blkpref(ip, lbn, (int)lbn, &ip->i_db[0], 0),
+ nsize, cred, &newb);
+ if (error)
+ return (error);
+ bp = getblk(vp, lbn, nsize, 0, 0, 0);
+ bp->b_blkno = fsbtodb(fs, newb);
+ if (flags & B_CLRBUF)
+ vfs_bio_clrbuf(bp);
+ }
+ ip->i_db[lbn] = dbtofsb(fs, bp->b_blkno);
+ ip->i_flag |= IN_CHANGE | IN_UPDATE;
+ *bpp = bp;
+ return (0);
+ }
+ /*
+ * Determine the number of levels of indirection.
+ */
+ pref = 0;
+ if ((error = ext2_getlbns(vp, lbn, indirs, &num)) != 0)
+ return(error);
+#ifdef DIAGNOSTIC
+ if (num < 1)
+ panic ("ext2_balloc: ext2_getlbns returned indirect block");
+#endif
+ /*
+ * Fetch the first indirect block allocating if necessary.
+ */
+ --num;
+ nb = ip->i_ib[indirs[0].in_off];
+ if (nb == 0) {
+ EXT2_LOCK(ump);
+ pref = ext2_blkpref(ip, lbn, indirs[0].in_off +
+ EXT2_NDIR_BLOCKS, &ip->i_db[0], 0);
+ if ((error = ext2_alloc(ip, lbn, pref,
+ (int)fs->e2fs_bsize, cred, &newb)))
+ return (error);
+ nb = newb;
+ bp = getblk(vp, indirs[1].in_lbn, fs->e2fs_bsize, 0, 0, 0);
+ bp->b_blkno = fsbtodb(fs, newb);
+ vfs_bio_clrbuf(bp);
+ /*
+ * Write synchronously so that indirect blocks
+ * never point at garbage.
+ */
+ if ((error = bwrite(bp)) != 0) {
+ ext2_blkfree(ip, nb, fs->e2fs_bsize);
+ return (error);
+ }
+ ip->i_ib[indirs[0].in_off] = newb;
+ ip->i_flag |= IN_CHANGE | IN_UPDATE;
+ }
+ /*
+ * Fetch through the indirect blocks, allocating as necessary.
+ */
+ for (i = 1;;) {
+ error = bread(vp,
+ indirs[i].in_lbn, (int)fs->e2fs_bsize, NOCRED, &bp);
+ if (error) {
+ brelse(bp);
+ return (error);
+ }
+ bap = (int32_t *)bp->b_data;
+ nb = bap[indirs[i].in_off];
+ if (i == num)
+ break;
+ i += 1;
+ if (nb != 0) {
+ bqrelse(bp);
+ continue;
+ }
+ EXT2_LOCK(ump);
+ if (pref == 0)
+ pref = ext2_blkpref(ip, lbn, indirs[i].in_off, bap,
+ bp->b_lblkno);
+ error = ext2_alloc(ip, lbn, pref, (int)fs->e2fs_bsize, cred, &newb);
+ if (error) {
+ brelse(bp);
+ return (error);
+ }
+ nb = newb;
+ nbp = getblk(vp, indirs[i].in_lbn, fs->e2fs_bsize, 0, 0, 0);
+ nbp->b_blkno = fsbtodb(fs, nb);
+ vfs_bio_clrbuf(nbp);
+ /*
+ * Write synchronously so that indirect blocks
+ * never point at garbage.
+ */
+ if ((error = bwrite(nbp)) != 0) {
+ ext2_blkfree(ip, nb, fs->e2fs_bsize);
+ EXT2_UNLOCK(ump);
+ brelse(bp);
+ return (error);
+ }
+ bap[indirs[i - 1].in_off] = nb;
+ /*
+ * If required, write synchronously, otherwise use
+ * delayed write.
+ */
+ if (flags & B_SYNC) {
+ bwrite(bp);
+ } else {
+ if (bp->b_bufsize == fs->e2fs_bsize)
+ bp->b_flags |= B_CLUSTEROK;
+ bdwrite(bp);
+ }
+ }
+ /*
+ * Get the data block, allocating if necessary.
+ */
+ if (nb == 0) {
+ EXT2_LOCK(ump);
+ pref = ext2_blkpref(ip, lbn, indirs[i].in_off, &bap[0],
+ bp->b_lblkno);
+ if ((error = ext2_alloc(ip,
+ lbn, pref, (int)fs->e2fs_bsize, cred, &newb)) != 0) {
+ brelse(bp);
+ return (error);
+ }
+ nb = newb;
+ nbp = getblk(vp, lbn, fs->e2fs_bsize, 0, 0, 0);
+ nbp->b_blkno = fsbtodb(fs, nb);
+ if (flags & B_CLRBUF)
+ vfs_bio_clrbuf(nbp);
+ bap[indirs[i].in_off] = nb;
+ /*
+ * If required, write synchronously, otherwise use
+ * delayed write.
+ */
+ if (flags & B_SYNC) {
+ bwrite(bp);
+ } else {
+ if (bp->b_bufsize == fs->e2fs_bsize)
+ bp->b_flags |= B_CLUSTEROK;
+ bdwrite(bp);
+ }
+ *bpp = nbp;
+ return (0);
+ }
+ brelse(bp);
+ if (flags & B_CLRBUF) {
+ error = bread(vp, lbn, (int)fs->e2fs_bsize, NOCRED, &nbp);
+ if (error) {
+ brelse(nbp);
+ return (error);
+ }
+ } else {
+ nbp = getblk(vp, lbn, fs->e2fs_bsize, 0, 0, 0);
+ nbp->b_blkno = fsbtodb(fs, nb);
+ }
+ *bpp = nbp;
+ return (0);
+}
+