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SubjectRe: 2.6.21-ext4-1
On Tue, May 08, 2007 at 03:05:56PM -0700, Mingming Cao wrote:
> On Tue, 2007-05-08 at 12:50 +1000, David Chinner wrote:
> > On Mon, May 07, 2007 at 01:56:23PM -0700, Mingming Cao wrote:
> > > In any case, it would be useful to add a new set of testsuites for the
> > > new fallocate() syscall and fsstress in LTP testsuites to automatically
> > > the preallocation code in ext4/XFS.
> >
> > I hacked an existing XFS test prog to do manual testing of the fallocate()
> > syscall. In the XFSQA suite we have various pre-alloc enhanced utils (e.g.
> > fsstress, fsx, etc) that we should probably update to be able to use both
> > fallocate and xfsctl so we can test both.
> >
> > Here's all the programs we use that have preallocation awareness:
> >
> > chook 982% grep RESVSP ltp/*.c | awk '/^ltp/ { split($1,a,":"); print a[1] ;}' | uniq
> > ltp/doio.c
> > ltp/fsstress.c
> > ltp/fsx.c
> > ltp/growfiles.c
> > ltp/iogen.c
> > chook 983% grep RESVSP src/* | awk '/^src/ { split($1,a,":"); print a[1] ;}' | uniq
> > src/alloc.c
> > src/fstest.c
> > src/iopat.c
> > src/randholes.c
> > src/resvtest.c
> > src/unwritten_mmap.c
> > src/unwritten_sync.c
> >
> Thanks for sharing the info. I think Amit used a fsx version with
> preallocation awareness test, but I don't know if we have other ltp
> tests that aware preallocation. I would very appreciate if you could
> share your preallocation test with us.

All the tests are in CVS:

http://oss.sgi.com/cgi-bin/cvsweb.cgi/xfs-cmds/xfstests/

I took this one:

http://oss.sgi.com/cgi-bin/cvsweb.cgi/~checkout~/xfs-cmds/xfstests/src/alloc.c?rev=1.9;content-type=text%2Fplain

and modified it. Patch is below - it's full of conditional XFS
functionality still - you shoul dbe able to get it to run easily
on ext4, though.

> > BTW, have you guys tested mmap writes into unwritten extents? ;)
> >
> I am not sure, Amit, have you done some mmap write test into
> uninitialized extents?
>
> Sorry, I still not quite clear what's the mapped problem you are worry
> about. Could you explain to me a bit more? thanks!

XFS needs a ->page_mkwrite() callout to correctly map pages that
have been dirtied by mmap that span unwritten extents. mmap reads
(i.e. when the fault first occurred) treat unwritten extents like
holes and so we need to remap them when they are dirtied to set all
the unwritten state in the bufferheads correctly for writeback.

See test 166 here:

http://oss.sgi.com/cgi-bin/cvsweb.cgi/xfs-cmds/xfstests/
http://oss.sgi.com/cgi-bin/cvsweb.cgi/xfs-cmds/xfstests/src/unwritten_mmap.c

The same behaviour is needed for delalloc extents to prevent ENOSPC
errors on writeback - the mmap write needs to do the freespace
accounting at the time the page is dirtied and that can only be done
through the ->page_mkwrite callout. Otherwise ENOSPC will occur in
the writeback path and that is a major pain....
This may not be a problem for ext4, but I thought I better point
out a couple of the more subtle problems mmap can introduce....
Cheers,

Dave.
--
Dave Chinner
Principal Engineer
SGI Australian Software Group


---
xfstests/src/Makefile | 7
xfstests/src/falloc.c | 376 ++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 381 insertions(+), 2 deletions(-)
Index: xfs-cmds/xfstests/src/falloc.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ xfs-cmds/xfstests/src/falloc.c 2007-04-30 12:41:13.862302450 +1000
@@ -0,0 +1,376 @@
+/*
+ * Copyright (c) 2000-2003,2007 Silicon Graphics, Inc.
+ * All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "global.h"
+
+/* should end up include somewhere */
+#define FA_ALLOCATE 0x1
+#define FA_DEALLOCATE 0x2
+#define FA_PREALLOCATE 0x3
+
+/* ia64 */
+#define __NR_fallocate 1305
+/*
+ * Block I/O parameterization. A basic block (BB) is the lowest size of
+ * filesystem allocation, and must equal 512. Length units given to bio
+ * routines are in BB's.
+ */
+
+/* Assume that if we have BTOBB, then we have the rest */
+#ifndef BTOBB
+#define BBSHIFT 9
+#define BBSIZE (1<<BBSHIFT)
+#define BBMASK (BBSIZE-1)
+#define BTOBB(bytes) (((__u64)(bytes) + BBSIZE - 1) >> BBSHIFT)
+#define BTOBBT(bytes) ((__u64)(bytes) >> BBSHIFT)
+#define BBTOB(bbs) ((bbs) << BBSHIFT)
+#define OFFTOBBT(bytes) ((__u64)(bytes) >> BBSHIFT)
+
+#define SEEKLIMIT32 0x7fffffff
+#define BBSEEKLIMIT32 BTOBBT(SEEKLIMIT32)
+#define SEEKLIMIT 0x7fffffffffffffffLL
+#define BBSEEKLIMIT OFFTOBBT(SEEKLIMIT)
+#endif
+
+#ifndef OFFTOBB
+#define OFFTOBB(bytes) (((__u64)(bytes) + BBSIZE - 1) >> BBSHIFT)
+#define BBTOOFF(bbs) ((__u64)(bbs) << BBSHIFT)
+#endif
+
+#define FSBTOBB(f) (OFFTOBBT(FSBTOOFF(f)))
+#define BBTOFSB(b) (OFFTOFSB(BBTOOFF(b)))
+#define OFFTOFSB(o) ((o) / blocksize)
+#define FSBTOOFF(f) ((f) * blocksize)
+
+void usage(void)
+{
+ printf("usage: alloc [-b blocksize] [-d dir] [-f file] [-n] [-r] [-t]\n"
+ "flags:\n"
+ " -n - non-interractive mode\n"
+ " -r - real time file\n"
+ " -t - truncate on open\n"
+ "\n"
+ "commands:\n"
+ " a [offset] [length] - alloc\n"
+ " p [offset] [length] - prealloc\n"
+ " f [offset] [length] - free\n"
+ " m [offset] [length] - print map\n"
+ " s - sync file\n"
+ " t [offset] - truncate\n"
+ " q - quit\n"
+ " h/? - this help\n");
+
+}
+
+int fd = -1;
+int blocksize;
+char *filename;
+
+/* params are in bytes */
+void map(off64_t off, off64_t len)
+{
+ struct getbmap bm[2];
+
+ bzero(bm, sizeof(bm));
+
+ bm[0].bmv_count = 2;
+ bm[0].bmv_offset = OFFTOBB(off);
+ if (len==(off64_t)-1) { /* unsigned... */
+ bm[0].bmv_length = -1;
+ printf(" MAP off=%lld, len=%lld [%lld-]\n",
+ (long long)off, (long long)len,
+ (long long)BBTOFSB(bm[0].bmv_offset));
+ } else {
+ bm[0].bmv_length = OFFTOBB(len);
+ printf(" MAP off=%lld, len=%lld [%lld,%lld]\n",
+ (long long)off, (long long)len,
+ (long long)BBTOFSB(bm[0].bmv_offset),
+ (long long)BBTOFSB(bm[0].bmv_length));
+ }
+
+ printf(" [ofs,count]: start..end\n");
+ for (;;) {
+#ifdef XFS_IOC_GETBMAP
+ if (xfsctl(filename, fd, XFS_IOC_GETBMAP, bm) < 0) {
+#else
+#ifdef F_GETBMAP
+ if (fcntl(fd, F_GETBMAP, bm) < 0) {
+#else
+bozo!
+#endif
+#endif
+ perror("getbmap");
+ break;
+ }
+
+ if (bm[0].bmv_entries == 0)
+ break;
+
+ printf(" [%lld,%lld]: ",
+ (long long)BBTOFSB(bm[1].bmv_offset),
+ (long long)BBTOFSB(bm[1].bmv_length));
+
+ if (bm[1].bmv_block == -1)
+ printf("hole");
+ else
+ printf("%lld..%lld",
+ (long long)BBTOFSB(bm[1].bmv_block),
+ (long long)BBTOFSB(bm[1].bmv_block +
+ bm[1].bmv_length - 1));
+ printf("\n");
+ }
+}
+
+int
+main(int argc, char **argv)
+{
+ int c;
+ char *dirname = NULL;
+ int done = 0;
+ int status = 0;
+ struct flock64 f;
+ off64_t len;
+ char line[1024];
+ off64_t off;
+ int oflags;
+ static char *opnames[] = { "alloc",
+ "prealloc",
+ "free" };
+ int opno;
+ static int optab[] = { FA_ALLOCATE,
+ FA_PREALLOCATE,
+ FA_DEALLOCATE };
+ int rflag = 0;
+ struct statvfs64 svfs;
+ int tflag = 0;
+ int nflag = 0;
+ int unlinkit = 0;
+ __int64_t v;
+
+ while ((c = getopt(argc, argv, "b:d:f:rtn")) != -1) {
+ switch (c) {
+ case 'b':
+ blocksize = atoi(optarg);
+ break;
+ case 'd':
+ if (filename) {
+ printf("can't specify both -d and -f\n");
+ exit(1);
+ }
+ dirname = optarg;
+ break;
+ case 'f':
+ if (dirname) {
+ printf("can't specify both -d and -f\n");
+ exit(1);
+ }
+ filename = optarg;
+ break;
+ case 'r':
+ rflag = 1;
+ break;
+ case 't':
+ tflag = 1;
+ break;
+ case 'n':
+ nflag++;
+ break;
+ default:
+ printf("unknown option\n");
+ usage();
+ exit(1);
+ }
+ }
+ if (!dirname && !filename)
+ dirname = ".";
+ if (!filename) {
+ static char tmpfile[] = "allocXXXXXX";
+
+ mkstemp(tmpfile);
+ filename = malloc(strlen(tmpfile) + strlen(dirname) + 2);
+ sprintf(filename, "%s/%s", dirname, tmpfile);
+ unlinkit = 1;
+ }
+ oflags = O_RDWR | O_CREAT | (tflag ? O_TRUNC : 0);
+ fd = open(filename, oflags, 0666);
+ if (!nflag) {
+ printf("alloc:\n");
+ printf(" filename %s\n", filename);
+ }
+ if (fd < 0) {
+ perror(filename);
+ exit(1);
+ }
+ if (!blocksize) {
+ if (fstatvfs64(fd, &svfs) < 0) {
+ perror(filename);
+ status = 1;
+ goto done;
+ }
+ blocksize = (int)svfs.f_bsize;
+ }
+ if (blocksize<0) {
+ fprintf(stderr,"illegal blocksize %d\n", blocksize);
+ status = 1;
+ goto done;
+ }
+ printf(" blocksize %d\n", blocksize);
+ if (rflag) {
+ struct fsxattr a;
+
+#ifdef XFS_IOC_FSGETXATTR
+ if (xfsctl(filename, fd, XFS_IOC_FSGETXATTR, &a) < 0) {
+ perror("XFS_IOC_FSGETXATTR");
+ status = 1;
+ goto done;
+ }
+#else
+#ifdef F_FSGETXATTR
+ if (fcntl(fd, F_FSGETXATTR, &a) < 0) {
+ perror("F_FSGETXATTR");
+ status = 1;
+ goto done;
+ }
+#else
+bozo!
+#endif
+#endif
+
+ a.fsx_xflags |= XFS_XFLAG_REALTIME;
+
+#ifdef XFS_IOC_FSSETXATTR
+ if (xfsctl(filename, fd, XFS_IOC_FSSETXATTR, &a) < 0) {
+ perror("XFS_IOC_FSSETXATTR");
+ status = 1;
+ goto done;
+ }
+#else
+#ifdef F_FSSETXATTR
+ if (fcntl(fd, F_FSSETXATTR, &a) < 0) {
+ perror("F_FSSETXATTR");
+ status = 1;
+ goto done;
+ }
+#else
+bozo!
+#endif
+#endif
+ }
+ while (!done) {
+ char *p;
+
+ if (!nflag) printf("alloc> ");
+ fflush(stdout);
+ if (!fgets(line, 1024, stdin)) break;
+
+ p=line+strlen(line);
+ if (p!=line&&p[-1]=='\n') p[-1]=0;
+
+ opno = 0;
+ switch (line[0]) {
+ case 'f':
+ opno++;
+ case 'p':
+ opno++;
+ case 'a':
+ v = strtoll(&line[2], &p, 0);
+ if (*p == 'b') {
+ off = FSBTOOFF(v);
+ p++;
+ } else
+ off = v;
+ if (*p == '\0')
+ v = -1;
+ else
+ v = strtoll(p, &p, 0);
+ if (*p == 'b') {
+ len = FSBTOOFF(v);
+ p++;
+ } else
+ len = v;
+
+ printf(" CMD %s, off=%lld, len=%lld\n",
+ opnames[opno], (long long)off, (long long)len);
+
+ c = syscall(__NR_fallocate, fd, optab[opno], off, len);
+
+ if (c < 0) {
+ perror(opnames[opno]);
+ break;
+ }
+
+ map(off,len);
+ break;
+ case 'm':
+ p = &line[1];
+ v = strtoll(p, &p, 0);
+ if (*p == 'b') {
+ off = FSBTOOFF(v);
+ p++;
+ } else
+ off = v;
+ if (*p == '\0')
+ len = -1;
+ else {
+ v = strtoll(p, &p, 0);
+ if (*p == 'b')
+ len = FSBTOOFF(v);
+ else
+ len = v;
+ }
+ map(off,len);
+ break;
+ case 't':
+ p = &line[1];
+ v = strtoll(p, &p, 0);
+ if (*p == 'b')
+ off = FSBTOOFF(v);
+ else
+ off = v;
+ printf(" TRUNCATE off=%lld\n", (long long)off);
+ if (ftruncate64(fd, off) < 0) {
+ perror("ftruncate");
+ break;
+ }
+ break;
+ case 's':
+ printf(" SYNC\n");
+ fsync(fd);
+ break;
+ case 'q':
+ printf(" QUIT\n");
+ done = 1;
+ break;
+ case '?':
+ case 'h':
+ usage();
+ break;
+ default:
+ printf("unknown command '%s'\n", line);
+ break;
+ }
+ }
+ if (!nflag) printf("\n");
+done:
+ if (fd != -1)
+ close(fd);
+ if (unlinkit)
+ unlink(filename);
+ exit(status);
+ /* NOTREACHED */
+}
Index: xfs-cmds/xfstests/src/Makefile
===================================================================
--- xfs-cmds.orig/xfstests/src/Makefile 2007-04-23 16:22:06.000000000 +1000
+++ xfs-cmds/xfstests/src/Makefile 2007-04-30 12:18:42.126750949 +1000
@@ -14,7 +14,7 @@ TARGETS = dirstress fill fill2 getpagesi

LINUX_TARGETS = loggen xfsctl bstat t_mtab getdevicesize \
preallo_rw_pattern_reader preallo_rw_pattern_writer ftrunc trunc \
- fs_perms testx looptest locktest unwritten_mmap
+ fs_perms testx looptest locktest unwritten_mmap falloc

IRIX_TARGETS = open_unlink

@@ -98,7 +98,10 @@ trunc: trunc.o

fs_perms: fs_perms.o
$(LINKTEST)
-
+
+falloc: falloc.o
+ $(LINKTEST)
+
testx: testx.o
$(LINKTEST)

-
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