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Date: Fri, 19 Jan 2007 14:47:29 +0530
From: "Amit K. Arora" <aarora@...ux.vnet.ibm.com>
To: linux-ext4@...r.kernel.org
Cc: suparna@...ibm.com, cmm@...ibm.com, alex@...sterfs.com,
suzuki@...ibm.com
Subject: Re: patch for fsx-linux
On Wed, Jan 17, 2007 at 03:16:58PM +0530, Amit K. Arora wrote:
> The patches for e2fsprogs and fsx-linux are available with me. I can
> post them if anyone is interested to try/test the preallocation patches.
> Also, I have a small test program/tool written which can be used for
> unit testing.
Here is the test patch for fsx-linux in LTP testsuite
(version ltp-full-20061121). This makes fsx call doprealloc (which does
preallocation ioctl) instead of dotruncate. Again, this is just for
testing (of persistent preallocation patches) purpose.
---
testcases/kernel/fs/fsx-linux/fsx-linux.c | 90 ++++++++++++++++++++++++++++--
1 files changed, 84 insertions(+), 6 deletions(-)
Index: ltp-full-20061121/testcases/kernel/fs/fsx-linux/fsx-linux.c
===================================================================
--- ltp-full-20061121.orig/testcases/kernel/fs/fsx-linux/fsx-linux.c
+++ ltp-full-20061121/testcases/kernel/fs/fsx-linux/fsx-linux.c
@@ -94,6 +94,7 @@ char *good_buf; /* a pointer to the co
char *temp_buf; /* a pointer to the current data */
char *fname; /* name of our test file */
int fd; /* fd for our test file */
+int block_size; /* block size*/
off_t file_size = 0;
off_t biggest = 0;
@@ -115,6 +116,8 @@ int truncbdy = 1; /* -t flag */
int writebdy = 1; /* -w flag */
long monitorstart = -1; /* -m flag */
long monitorend = -1; /* -m flag */
+int prealloc = 0; /* -x flag */
+int ext4 = 0; /* -x flag */
int lite = 0; /* -L flag */
long numops = -1; /* -N flag */
int randomoplen = 1; /* -O flag disables it */
@@ -355,6 +358,19 @@ check_buffers(unsigned offset, unsigned
}
}
+int
+get_block_size(void)
+{
+ struct stat statbuf;
+
+ if (fstat(fd, &statbuf)) {
+ prterr("get_block_size: fstat");
+ report_failure(115);
+ }
+
+ return statbuf.st_blksize;
+}
+
void
check_size(void)
@@ -628,6 +644,47 @@ domapwrite(unsigned offset, unsigned siz
}
}
+#define EXT4_IOC_FALLOCATE 0x40106609
+void
+doprealloc(unsigned size)
+{
+ int ret;
+ struct ext4_falloc_input {
+ unsigned long long offset;
+ unsigned long long len;
+ } input;
+
+ if (!size) {
+ prt("skipping zero size preallocation\n");
+ return;
+ }
+
+ if (!ext4) {
+ prt("doprealloc: Preallocation currently supported "
+ "on ext4 _only_\n");
+ return;
+ }
+
+ input.offset = 0;
+ input.len = (unsigned long long)size;
+
+ if (testcalls <= simulatedopcount)
+ return;
+
+ if (progressinterval && testcalls % progressinterval == 0 ||
+ debug && (monitorstart == -1 || monitorend == -1 ||
+ size <= monitorend))
+ prt("%lu trunc\tfrom 0x0 to 0x%x\n", testcalls, size);
+
+ ret = ioctl(fd, EXT4_IOC_FALLOCATE, &input);
+ if (ret < 0) {
+ prt("ioctl: %x\n", size);
+ prterr("doprealloc: ioctl");
+ report_failure(160);
+ } else
+ if (size > file_size)
+ file_size = (size + block_size - 1) & (~(block_size - 1));
+}
void
dotruncate(unsigned size)
@@ -679,7 +736,7 @@ writefileimage()
prt("short write: 0x%x bytes instead of 0x%qx\n",
iret, (unsigned long long)file_size);
report_failure(172);
- }
+ }
if (lite ? 0 : ftruncate(fd, file_size) == -1) {
prt("ftruncate2: %qx\n", (unsigned long long)file_size);
prterr("writefileimage: ftruncate");
@@ -742,13 +799,15 @@ test(void)
* TRUNCATE: op = 3
* MAPWRITE: op = 3 or 4
*/
- if (lite ? 0 : op == 3 && (style & 1) == 0) /* vanilla truncate? */
- dotruncate(random() % maxfilelen);
+ if (lite ? 0 : op == 3 && (style & 1) == 0) { /* vanilla truncate? */
+ size = random() % maxfilelen;
+ (prealloc) ? doprealloc(size) : dotruncate(size);
+ }
else {
if (randomoplen)
size = random() % (maxoplen+1);
if (lite ? 0 : op == 3)
- dotruncate(size);
+ (prealloc) ? doprealloc(size) : dotruncate(size);
else {
offset = random();
if (op == 1 || op == (lite ? 3 : 4)) {
@@ -777,6 +836,7 @@ test(void)
check_size();
if (closeopen)
docloseopen();
+
}
@@ -795,7 +855,7 @@ void
usage(void)
{
fprintf(stdout, "usage: %s",
- "fsx [-dnqLOW] [-b opnum] [-c Prob] [-l flen] [-m start:end] [-o oplen] [-p progressinterval] [-r readbdy] [-s style] [-t truncbdy] [-w writebdy] [-D startingop] [-N numops] [-P dirpath] [-S seed] fname\n\
+ "fsx [-dnqLOW] [-b opnum] [-c Prob] [-l flen] [-m start:end] [-o oplen] [-p progressinterval] [-r readbdy] [-s style] [-t truncbdy] [-w writebdy] [-x xfs/ext4] [-D startingop] [-N numops] [-P dirpath] [-S seed] fname\n\
-b opnum: beginning operation number (default 1)\n\
-c P: 1 in P chance of file close+open at each op (default infinity)\n\
-d: debug output for all operations\n\
@@ -809,6 +869,7 @@ usage(void)
-s style: 1 gives smaller truncates (default 0)\n\
-t truncbdy: 4096 would make truncates page aligned (default 1)\n\
-w writebdy: 4096 would make writes page aligned (default 1)\n\
+ -x ext4/xfs: Do preallocate. filesystem can be either xfs, or ext4\n\
-D startingop: debug output starting at specified operation\n\
-L: fsxLite - no file creations & no file size changes\n\
-N numops: total # operations to do (default infinity)\n\
@@ -869,7 +930,7 @@ main(int argc, char **argv)
setvbuf(stdout, (char *)0, _IOLBF, 0); /* line buffered stdout */
- while ((ch = getopt(argc, argv, "b:c:dl:m:no:p:qr:s:t:w:D:LN:OP:RS:W"))
+ while ((ch = getopt(argc, argv, "b:c:dl:m:no:p:qr:s:t:w:x:D:LN:OP:RS:W"))
!= EOF)
switch (ch) {
case 'b':
@@ -946,6 +1007,17 @@ main(int argc, char **argv)
if (writebdy <= 0)
usage();
break;
+ case 'x':
+ prealloc = 1;
+ if (!strcmp(optarg, "ext4"))
+ ext4 = 1;
+ printf("ext4 = %u\n", ext4);
+ if (!ext4 && strcmp(optarg, "xfs"))
+ usage();
+ /* If we are here, ext4==1 signifies ext4 filesystem,
+ else it signifies xfs filesystem */
+
+ break;
case 'D':
debugstart = getnum(optarg, &endp);
if (debugstart < 1)
@@ -1015,6 +1087,12 @@ main(int argc, char **argv)
prterr(fname);
exit(91);
}
+
+ block_size = get_block_size();
+
+ if (prealloc)
+ doprealloc(maxfilelen);
+
strncat(goodfile, fname, 256);
strcat (goodfile, ".fsxgood");
fsxgoodfd = open(goodfile, O_RDWR|O_CREAT|O_TRUNC, 0666);
--
Regards,
Amit Arora
-
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