linux-ext4 - [PATCH RFC 1/2] xfstests: fsx: add support for cluster size

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Date:   Fri, 24 Apr 2020 17:33:49 +0800
From:   Jeffle Xu <jefflexu@...ux.alibaba.com>
To:     fstests@...r.kernel.org
Cc:     linux-ext4@...r.kernel.org, joseph.qi@...ux.alibaba.com,
        Jeffle Xu <jefflexu@...ux.alibaba.com>
Subject: [PATCH RFC 1/2] xfstests: fsx: add support for cluster size

The offset and size should be aligned with cluster size when inserting
or collapsing range on ext4 with 'bigalloc' feature enabled. Currently
I can find only ext4 with this limitation.

Since fsx should have no assumption of the underlying filesystem, and
thus add the '-u cluster_size' option. Tests can set this option when
the underlying filesystem is ext4 with bigalloc enabled.

Signed-off-by: Jeffle Xu <jefflexu@...ux.alibaba.com>
---
 ltp/fsx.c | 20 ++++++++++++++------
 1 file changed, 14 insertions(+), 6 deletions(-)

diff --git a/ltp/fsx.c b/ltp/fsx.c
index 9d598a4..5fe5738 100644
--- a/ltp/fsx.c
+++ b/ltp/fsx.c
@@ -133,6 +133,7 @@ int	dirpath = 0;			/* -P flag */
 int	fd;				/* fd for our test file */
 
 blksize_t	block_size = 0;
+blksize_t	cluster_size = 0;
 off_t		file_size = 0;
 off_t		biggest = 0;
 long long	testcalls = 0;		/* calls to function "test" */
@@ -2146,8 +2147,8 @@ have_op:
 		break;
 	case OP_COLLAPSE_RANGE:
 		TRIM_OFF_LEN(offset, size, file_size - 1);
-		offset = offset & ~(block_size - 1);
-		size = size & ~(block_size - 1);
+		offset = offset & ~(cluster_size - 1);
+		size = size & ~(cluster_size - 1);
 		if (size == 0) {
 			log4(OP_COLLAPSE_RANGE, offset, size, FL_SKIPPED);
 			goto out;
@@ -2157,8 +2158,8 @@ have_op:
 	case OP_INSERT_RANGE:
 		TRIM_OFF(offset, file_size);
 		TRIM_LEN(file_size, size, maxfilelen);
-		offset = offset & ~(block_size - 1);
-		size = size & ~(block_size - 1);
+		offset = offset & ~(cluster_size - 1);
+		size = size & ~(cluster_size - 1);
 		if (size == 0) {
 			log4(OP_INSERT_RANGE, offset, size, FL_SKIPPED);
 			goto out;
@@ -2231,7 +2232,7 @@ void
 usage(void)
 {
 	fprintf(stdout, "usage: %s",
-		"fsx [-dknqxABEFJLOWZ] [-b opnum] [-c Prob] [-g filldata] [-i logdev] [-j logid] [-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 [-dknqxABEFJLOWZ] [-b opnum] [-c Prob] [-g filldata] [-i logdev] [-j logid] [-l flen] [-m start:end] [-o oplen] [-p progressinterval] [-r readbdy] [-s style] [-t truncbdy] [-u csize] [-w writebdy] [-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\
@@ -2249,6 +2250,7 @@ usage(void)
 	-r readbdy: 4096 would make reads page aligned (default 1)\n\
 	-s style: 1 gives smaller truncates (default 0)\n\
 	-t truncbdy: 4096 would make truncates page aligned (default 1)\n\
+	-u csize: filesystem specific cluster size that may be used for ops like insert/collapse range\n\
 	-w writebdy: 4096 would make writes page aligned (default 1)\n\
 	-x: preallocate file space before starting, XFS only (default 0)\n\
 	-y synchronize changes to a file\n"
@@ -2485,7 +2487,7 @@ main(int argc, char **argv)
 	setvbuf(stdout, (char *)0, _IOLBF, 0); /* line buffered stdout */
 
 	while ((ch = getopt_long(argc, argv,
-				 "b:c:dfg:i:j:kl:m:no:p:qr:s:t:w:xyABD:EFJKHzCILN:OP:RS:WXZ",
+				 "b:c:dfg:i:j:kl:m:no:p:qr:s:t:u:w:xyABD:EFJKHzCILN:OP:RS:WXZ",
 				 longopts, NULL)) != EOF)
 		switch (ch) {
 		case 'b':
@@ -2579,6 +2581,11 @@ main(int argc, char **argv)
 			if (truncbdy <= 0)
 				usage();
 			break;
+		case 'u':
+			cluster_size = getnum(optarg, &endp);
+			if (cluster_size <= 0)
+				usage();
+			break;
 		case 'w':
 			writebdy = getnum(optarg, &endp);
 			if (writebdy <= 0)
@@ -2720,6 +2727,7 @@ main(int argc, char **argv)
 		exit(91);
 	}
 	block_size = statbuf.st_blksize;
+	cluster_size = cluster_size ? : block_size;
 #ifdef XFS
 	if (prealloc) {
 		xfs_flock64_t	resv = { 0 };
-- 
1.8.3.1