[PATCH v3 0/4] mdadm: remove bitmap file support

[PATCH v3 0/4] mdadm: remove bitmap file support

[Yu Kuai]

From: Yu Kuai <yukuai3@huawei.com>

Changes in v2:
 - remove patch to support lockless bitmap;

Changes in v3:
 - add patch 4;

Yu Kuai (4):
  tests/04update-uuid: remove bitmap file test
  tests/05r1-re-add-nosuper: remove bitmap file test
  mdadm: remove bitmap file support
  Manage: forbid re-add to the array without metadata

 Assemble.c                | 33 +-------------
 Build.c                   | 35 +--------------
 Create.c                  | 39 +++-------------
 Grow.c                    | 94 +++++----------------------------------
 Incremental.c             | 37 +--------------
 Manage.c                  | 12 +++++
 bitmap.c                  | 44 +++++++++---------
 config.c                  | 17 ++++---
 mdadm.c                   | 76 +++++++++++++------------------
 mdadm.h                   | 18 +++++---
 tests/04update-uuid       | 34 --------------
 tests/05r1-re-add-nosuper | 32 +++----------
 12 files changed, 117 insertions(+), 354 deletions(-)

-- 
2.39.2

[PATCH v3 1/4] tests/04update-uuid: remove bitmap file test

[Yu Kuai]

From: Yu Kuai <yukuai3@huawei.com>

Prepare to remove the bitmap file support.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
---
 tests/04update-uuid | 34 ----------------------------------
 1 file changed, 34 deletions(-)

diff --git a/tests/04update-uuid b/tests/04update-uuid
index 25314ab5..ce5a958c 100644
--- a/tests/04update-uuid
+++ b/tests/04update-uuid
@@ -22,40 +22,6 @@ mdadm -D /dev/md0 | grep -s > /dev/null 01234567:89abcdef:fedcba98:76543210 || {
 }
 mdadm -S /dev/md0
 
-
-# now if we have a bitmap, that needs updating too.
-rm -f $targetdir/bitmap
-yes | mdadm -CR --assume-clean -b $targetdir/bitmap $md0 -l5 -n3 $dev0 $dev1 $dev2
-mdadm -S /dev/md0
-mdadm -A /dev/md0 -b $targetdir/bitmap --update=uuid --uuid=0123456789abcdef:fedcba9876543210 $dev0 $dev1 $dev2
-no_errors
-mdadm -D /dev/md0 | grep -s > /dev/null 01234567:89abcdef:fedcba98:76543210 || {
-   echo Wrong uuid; mdadm -D /dev/md0 ; exit 2;
-}
-if mdadm -X $targetdir/bitmap | grep -s > /dev/null 01234567:89abcdef:fedcba98:76543210 ||
-   mdadm -X $targetdir/bitmap | grep -s > /dev/null 67452301:efcdab89:98badcfe:10325476
-then : ; else
-   echo Wrong uuid; mdadm -X $targetdir/bitmap ; exit 2;
-fi
-mdadm -S /dev/md0
-
-# and bitmap for version1
-rm -f $targetdir/bitmap
-yes | mdadm -CR --assume-clean -e1.1 -b $targetdir/bitmap $md0 -l5 -n3 $dev0 $dev1 $dev2
-mdadm -S /dev/md0
-mdadm -A /dev/md0 -b $targetdir/bitmap --update=uuid --uuid=0123456789abcdef:fedcba9876543210 $dev0 $dev1 $dev2
-no_errors
-mdadm -D /dev/md0 | grep -s > /dev/null 01234567:89abcdef:fedcba98:76543210 || {
-   echo Wrong uuid; mdadm -D /dev/md0 ; exit 2;
-}
-# -X cannot tell which byteorder to use for the UUID, so allow both.
-if mdadm -X $targetdir/bitmap | grep -s > /dev/null 01234567:89abcdef:fedcba98:76543210 ||
-   mdadm -X $targetdir/bitmap | grep -s > /dev/null 67452301:efcdab89:98badcfe:10325476
-then : ; else
-   echo Wrong uuid; mdadm -X $targetdir/bitmap ; exit 2;
-fi
-mdadm -S /dev/md0
-
 # Internal bitmaps too.
 mdadm -CR --assume-clean  -b internal --bitmap-chunk 4 $md0 -l5 -n3 $dev0 $dev1 $dev2
 mdadm -S /dev/md0
-- 
2.39.2

[PATCH v3 2/4] tests/05r1-re-add-nosuper: remove bitmap file test

[Yu Kuai]

From: Yu Kuai <yukuai3@huawei.com>

Prepare to remove bitmap file support.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
---
 tests/05r1-re-add-nosuper | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/tests/05r1-re-add-nosuper b/tests/05r1-re-add-nosuper
index 7d41fd7b..a3fa9503 100644
--- a/tests/05r1-re-add-nosuper
+++ b/tests/05r1-re-add-nosuper
@@ -1,12 +1,9 @@
-
 #
 # create a raid1, remove a drive, and readd it.
 # resync should be instant.
 # Then do some IO first.  Resync should still be very fast
 #
-bmf=$targetdir/bitmap2
-rm -f $bmf
-yes | mdadm -B $md0 -l1 -n2 -b$bmf -d1 $dev1 $dev2
+mdadm -B $md0 -l1 -n2 -d1 $dev1 $dev2
 check resync
 check wait
 testdev $md0 1 $size 1
-- 
2.39.2

[PATCH v3 3/4] mdadm: remove bitmap file support

[Yu Kuai]

From: Yu Kuai <yukuai3@huawei.com>

Because it's marked deprecated for a long time now, and it's not worthy
to support it for new bitmap.

Now that we don't need to store filename for bitmap, also declare a new
enum type bitmap_type to simplify code.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
---
 Assemble.c    | 33 +-----------------
 Build.c       | 35 +------------------
 Create.c      | 39 ++++-----------------
 Grow.c        | 94 ++++++---------------------------------------------
 Incremental.c | 37 +-------------------
 bitmap.c      | 44 +++++++++++++-----------
 config.c      | 17 +++++++---
 mdadm.c       | 76 ++++++++++++++++++-----------------------
 mdadm.h       | 18 ++++++----
 9 files changed, 99 insertions(+), 294 deletions(-)

diff --git a/Assemble.c b/Assemble.c
index 87d1ae04..37a530ee 100644
--- a/Assemble.c
+++ b/Assemble.c
@@ -633,7 +633,6 @@ static int load_devices(struct devs *devices, char *devmap,
 	struct mddev_dev *tmpdev;
 	int devcnt = 0;
 	int nextspare = 0;
-	int bitmap_done = 0;
 	int most_recent = -1;
 	int bestcnt = 0;
 	int *best = *bestp;
@@ -661,7 +660,7 @@ static int load_devices(struct devs *devices, char *devmap,
 			if (c->update == UOPT_UUID && !ident->uuid_set)
 				random_uuid((__u8 *)ident->uuid);
 
-			if (c->update == UOPT_PPL && ident->bitmap_fd >= 0) {
+			if (c->update == UOPT_PPL && ident->btype != BitmapNone) {
 				pr_err("PPL is not compatible with bitmap\n");
 				close(mdfd);
 				free(devices);
@@ -728,16 +727,6 @@ static int load_devices(struct devs *devices, char *devmap,
 			if (tst->ss->store_super(tst, dfd))
 				pr_err("Could not re-write superblock on %s.\n",
 				       devname);
-
-			if (c->update == UOPT_UUID &&
-			    ident->bitmap_fd >= 0 && !bitmap_done) {
-				if (bitmap_update_uuid(ident->bitmap_fd,
-						       content->uuid,
-						       tst->ss->swapuuid) != 0)
-					pr_err("Could not update uuid on external bitmap.\n");
-				else
-					bitmap_done = 1;
-			}
 		} else {
 			dfd = dev_open(devname,
 				       tmpdev->disposition == 'I'
@@ -1057,26 +1046,6 @@ static int start_array(int mdfd,
 		       mddev, strerror(errno));
 		return 1;
 	}
-	if (ident->bitmap_fd >= 0) {
-		if (ioctl(mdfd, SET_BITMAP_FILE, ident->bitmap_fd) != 0) {
-			pr_err("SET_BITMAP_FILE failed.\n");
-			return 1;
-		}
-	} else if (ident->bitmap_file) {
-		/* From config file */
-		int bmfd = open(ident->bitmap_file, O_RDWR);
-		if (bmfd < 0) {
-			pr_err("Could not open bitmap file %s\n",
-			       ident->bitmap_file);
-			return 1;
-		}
-		if (ioctl(mdfd, SET_BITMAP_FILE, bmfd) != 0) {
-			pr_err("Failed to set bitmapfile for %s\n", mddev);
-			close(bmfd);
-			return 1;
-		}
-		close(bmfd);
-	}
 
 	/* First, add the raid disks, but add the chosen one last */
 	for (i = 0; i <= bestcnt; i++) {
diff --git a/Build.c b/Build.c
index 6f63d3f3..70aab7a0 100644
--- a/Build.c
+++ b/Build.c
@@ -40,8 +40,6 @@ int Build(struct mddev_ident *ident, struct mddev_dev *devlist, struct shape *s,
 	dev_t rdev;
 	int subdevs = 0, missing_disks = 0;
 	struct mddev_dev *dv;
-	int bitmap_fd;
-	unsigned long long bitmapsize;
 	int mdfd;
 	char chosen_name[1024];
 	int uuid[4] = {0,0,0,0};
@@ -110,13 +108,6 @@ int Build(struct mddev_ident *ident, struct mddev_dev *devlist, struct shape *s,
 		goto abort;
 	}
 
-	if (s->bitmap_file && str_is_none(s->bitmap_file) == true)
-		s->bitmap_file = NULL;
-	if (s->bitmap_file && s->level <= 0) {
-		pr_err("bitmaps not meaningful with level %s\n",
-			map_num(pers, s->level)?:"given");
-		goto abort;
-	}
 	/* now add the devices */
 	for ((i=0), (dv = devlist) ; dv ; i++, dv=dv->next) {
 		mdu_disk_info_t disk;
@@ -150,31 +141,7 @@ int Build(struct mddev_ident *ident, struct mddev_dev *devlist, struct shape *s,
 			goto abort;
 		}
 	}
-	/* now to start it */
-	if (s->bitmap_file) {
-		bitmap_fd = open(s->bitmap_file, O_RDWR);
-		if (bitmap_fd < 0) {
-			int major = BITMAP_MAJOR_HI;
-			bitmapsize = s->size >> 9; /* FIXME wrong for RAID10 */
-			if (CreateBitmap(s->bitmap_file, 1, NULL,
-					 s->bitmap_chunk, c->delay,
-					 s->write_behind, bitmapsize, major)) {
-				goto abort;
-			}
-			bitmap_fd = open(s->bitmap_file, O_RDWR);
-			if (bitmap_fd < 0) {
-				pr_err("%s cannot be opened.\n", s->bitmap_file);
-				goto abort;
-			}
-		}
-		if (ioctl(mdfd, SET_BITMAP_FILE, bitmap_fd) < 0) {
-			pr_err("Cannot set bitmap file for %s: %s\n", chosen_name,
-			       strerror(errno));
-			close(bitmap_fd);
-			goto abort;
-		}
-	close(bitmap_fd);
-	}
+
 	if (ioctl(mdfd, RUN_ARRAY, &param)) {
 		pr_err("RUN_ARRAY failed: %s\n", strerror(errno));
 		if (s->chunk & (s->chunk - 1)) {
diff --git a/Create.c b/Create.c
index 140a7098..ade677cd 100644
--- a/Create.c
+++ b/Create.c
@@ -521,7 +521,6 @@ int Create(struct supertype *st, struct mddev_ident *ident, int subdevs,
 	int insert_point = subdevs * 2; /* where to insert a missing drive */
 	int total_slots;
 	int rv;
-	int bitmap_fd;
 	int have_container = 0;
 	int container_fd = -1;
 	int need_mdmon = 0;
@@ -534,9 +533,9 @@ int Create(struct supertype *st, struct mddev_ident *ident, int subdevs,
 	struct map_ent *map = NULL;
 	unsigned long long newsize;
 	mdu_array_info_t inf;
-
 	int major_num = BITMAP_MAJOR_HI;
-	if (s->bitmap_file && strcmp(s->bitmap_file, "clustered") == 0) {
+
+	if (s->btype == BitmapCluster) {
 		major_num = BITMAP_MAJOR_CLUSTERED;
 		if (c->nodes <= 1) {
 			pr_err("At least 2 nodes are needed for cluster-md\n");
@@ -618,7 +617,7 @@ int Create(struct supertype *st, struct mddev_ident *ident, int subdevs,
 		pr_err("You haven't given enough devices (real or missing) to create this array\n");
 		return 1;
 	}
-	if (s->bitmap_file && s->level <= 0) {
+	if (s->btype != BitmapNone && s->btype != BitmapUnknown && s->level <= 0) {
 		pr_err("bitmaps not meaningful with level %s\n",
 			map_num(pers, s->level)?:"given");
 		return 1;
@@ -949,7 +948,7 @@ int Create(struct supertype *st, struct mddev_ident *ident, int subdevs,
 		}
 	}
 
-	if (!s->bitmap_file &&
+	if (s->btype == BitmapNone &&
 	    !st->ss->external &&
 	    s->level >= 1 &&
 	    st->ss->add_internal_bitmap &&
@@ -959,10 +958,8 @@ int Create(struct supertype *st, struct mddev_ident *ident, int subdevs,
 	    (s->write_behind || s->size > 100*1024*1024ULL)) {
 		if (c->verbose > 0)
 			pr_err("automatically enabling write-intent bitmap on large array\n");
-		s->bitmap_file = "internal";
+		s->btype = BitmapInternal;
 	}
-	if (s->bitmap_file && str_is_none(s->bitmap_file) == true)
-		s->bitmap_file = NULL;
 
 	if (s->consistency_policy == CONSISTENCY_POLICY_PPL &&
 	    !st->ss->write_init_ppl) {
@@ -1198,8 +1195,7 @@ int Create(struct supertype *st, struct mddev_ident *ident, int subdevs,
 	 * to stop another mdadm from finding and using those devices.
 	 */
 
-	if (s->bitmap_file && (strcmp(s->bitmap_file, "internal") == 0 ||
-			       strcmp(s->bitmap_file, "clustered") == 0)) {
+	if (s->btype == BitmapInternal || s->btype == BitmapCluster) {
 		if (!st->ss->add_internal_bitmap) {
 			pr_err("internal bitmaps not supported with %s metadata\n",
 				st->ss->name);
@@ -1211,7 +1207,6 @@ int Create(struct supertype *st, struct mddev_ident *ident, int subdevs,
 			pr_err("Given bitmap chunk size not supported.\n");
 			goto abort_locked;
 		}
-		s->bitmap_file = NULL;
 	}
 
 	if (sysfs_init(&info, mdfd, NULL)) {
@@ -1253,28 +1248,6 @@ int Create(struct supertype *st, struct mddev_ident *ident, int subdevs,
 		goto abort_locked;
 	}
 
-	if (s->bitmap_file) {
-		int uuid[4];
-
-		st->ss->uuid_from_super(st, uuid);
-		if (CreateBitmap(s->bitmap_file, c->force, (char*)uuid, s->bitmap_chunk,
-				 c->delay, s->write_behind,
-				 bitmapsize,
-				 major_num)) {
-			goto abort_locked;
-		}
-		bitmap_fd = open(s->bitmap_file, O_RDWR);
-		if (bitmap_fd < 0) {
-			pr_err("weird: %s cannot be opened\n",
-				s->bitmap_file);
-			goto abort_locked;
-		}
-		if (ioctl(mdfd, SET_BITMAP_FILE, bitmap_fd) < 0) {
-			pr_err("Cannot set bitmap file for %s: %s\n", chosen_name, strerror(errno));
-			goto abort_locked;
-		}
-	}
-
 	if (add_disks(mdfd, &info, s, c, st, &map, devlist, total_slots,
 		      have_container, insert_point, major_num, chosen_name))
 		goto abort_locked;
diff --git a/Grow.c b/Grow.c
index 31786941..cc1be6cc 100644
--- a/Grow.c
+++ b/Grow.c
@@ -285,7 +285,6 @@ int Grow_addbitmap(char *devname, int fd, struct context *c, struct shape *s)
 	 * find all the active devices, and write the bitmap block
 	 * to all devices
 	 */
-	mdu_bitmap_file_t bmf;
 	mdu_array_info_t array;
 	struct supertype *st;
 	char *subarray = NULL;
@@ -294,40 +293,21 @@ int Grow_addbitmap(char *devname, int fd, struct context *c, struct shape *s)
 	struct mdinfo *mdi;
 
 	/*
-	 * We only ever get called if s->bitmap_file is != NULL, so this check
+	 * We only ever get called if bitmap is not none, so this check
 	 * is just here to quiet down static code checkers.
 	 */
-	if (!s->bitmap_file)
+	if (s->btype == BitmapUnknown)
 		return 1;
 
-	if (strcmp(s->bitmap_file, "clustered") == 0)
+	if (s->btype == BitmapCluster)
 		major = BITMAP_MAJOR_CLUSTERED;
 
-	if (ioctl(fd, GET_BITMAP_FILE, &bmf) != 0) {
-		if (errno == ENOMEM)
-			pr_err("Memory allocation failure.\n");
-		else
-			pr_err("bitmaps not supported by this kernel.\n");
-		return 1;
-	}
-	if (bmf.pathname[0]) {
-		if (str_is_none(s->bitmap_file) == true) {
-			if (ioctl(fd, SET_BITMAP_FILE, -1) != 0) {
-				pr_err("failed to remove bitmap %s\n",
-					bmf.pathname);
-				return 1;
-			}
-			return 0;
-		}
-		pr_err("%s already has a bitmap (%s)\n", devname, bmf.pathname);
-		return 1;
-	}
 	if (md_get_array_info(fd, &array) != 0) {
 		pr_err("cannot get array status for %s\n", devname);
 		return 1;
 	}
 	if (array.state & (1 << MD_SB_BITMAP_PRESENT)) {
-		if (str_is_none(s->bitmap_file) == true) {
+		if (s->btype == BitmapNone) {
 			array.state &= ~(1 << MD_SB_BITMAP_PRESENT);
 			if (md_set_array_info(fd, &array) != 0) {
 				if (array.state & (1 << MD_SB_CLUSTERED))
@@ -342,10 +322,11 @@ int Grow_addbitmap(char *devname, int fd, struct context *c, struct shape *s)
 		return 1;
 	}
 
-	if (str_is_none(s->bitmap_file) == true) {
+	if (s->btype == BitmapNone) {
 		pr_err("no bitmap found on %s\n", devname);
 		return 1;
 	}
+
 	if (array.level <= 0) {
 		pr_err("Bitmaps not meaningful with level %s\n",
 			map_num(pers, array.level)?:"of this array");
@@ -371,7 +352,7 @@ int Grow_addbitmap(char *devname, int fd, struct context *c, struct shape *s)
 		ncopies = (array.layout & 255) * ((array.layout >> 8) & 255);
 		bitmapsize = bitmapsize * array.raid_disks / ncopies;
 
-		if (strcmp(s->bitmap_file, "clustered") == 0 &&
+		if (s->btype == BitmapCluster &&
 		    !is_near_layout_10(array.layout)) {
 			pr_err("only near layout is supported with clustered raid10\n");
 			return 1;
@@ -402,8 +383,7 @@ int Grow_addbitmap(char *devname, int fd, struct context *c, struct shape *s)
 		free(mdi);
 	}
 
-	if (strcmp(s->bitmap_file, "internal") == 0 ||
-	    strcmp(s->bitmap_file, "clustered") == 0) {
+	if (s->btype == BitmapInternal || s->btype == BitmapCluster) {
 		int rv;
 		int d;
 		int offset_setable = 0;
@@ -432,7 +412,7 @@ int Grow_addbitmap(char *devname, int fd, struct context *c, struct shape *s)
 			if (!dv)
 				continue;
 			if ((disk.state & (1 << MD_DISK_WRITEMOSTLY)) &&
-			   (strcmp(s->bitmap_file, "clustered") == 0)) {
+			    s->btype == BitmapCluster) {
 				pr_err("%s disks marked write-mostly are not supported with clustered bitmap\n",devname);
 				free(mdi);
 				return 1;
@@ -471,7 +451,7 @@ int Grow_addbitmap(char *devname, int fd, struct context *c, struct shape *s)
 						  mdi->bitmap_offset);
 			free(mdi);
 		} else {
-			if (strcmp(s->bitmap_file, "clustered") == 0)
+			if (s->btype == BitmapCluster)
 				array.state |= (1 << MD_SB_CLUSTERED);
 			array.state |= (1 << MD_SB_BITMAP_PRESENT);
 			rv = md_set_array_info(fd, &array);
@@ -482,60 +462,6 @@ int Grow_addbitmap(char *devname, int fd, struct context *c, struct shape *s)
 			pr_err("failed to set internal bitmap.\n");
 			return 1;
 		}
-	} else {
-		int uuid[4];
-		int bitmap_fd;
-		int d;
-		int max_devs = st->max_devs;
-
-		/* try to load a superblock */
-		for (d = 0; d < max_devs; d++) {
-			mdu_disk_info_t disk;
-			char *dv;
-			int fd2;
-			disk.number = d;
-			if (md_get_disk_info(fd, &disk) < 0)
-				continue;
-			if ((disk.major==0 && disk.minor == 0) ||
-			    (disk.state & (1 << MD_DISK_REMOVED)))
-				continue;
-			dv = map_dev(disk.major, disk.minor, 1);
-			if (!dv)
-				continue;
-			fd2 = dev_open(dv, O_RDONLY);
-			if (fd2 >= 0) {
-				if (st->ss->load_super(st, fd2, NULL) == 0) {
-					close(fd2);
-					st->ss->uuid_from_super(st, uuid);
-					break;
-				}
-				close(fd2);
-			}
-		}
-		if (d == max_devs) {
-			pr_err("cannot find UUID for array!\n");
-			return 1;
-		}
-		if (CreateBitmap(s->bitmap_file, c->force, (char*)uuid,
-				 s->bitmap_chunk, c->delay, s->write_behind,
-				 bitmapsize, major)) {
-			return 1;
-		}
-		bitmap_fd = open(s->bitmap_file, O_RDWR);
-		if (bitmap_fd < 0) {
-			pr_err("weird: %s cannot be opened\n", s->bitmap_file);
-			return 1;
-		}
-		if (ioctl(fd, SET_BITMAP_FILE, bitmap_fd) < 0) {
-			int err = errno;
-			if (errno == EBUSY)
-				pr_err("Cannot add bitmap while array is resyncing or reshaping etc.\n");
-			pr_err("Cannot set bitmap file for %s: %s\n",
-				devname, strerror(err));
-			close_fd(&bitmap_fd);
-			return 1;
-		}
-		close_fd(&bitmap_fd);
 	}
 
 	return 0;
diff --git a/Incremental.c b/Incremental.c
index 5e59b6d1..aa5db3bf 100644
--- a/Incremental.c
+++ b/Incremental.c
@@ -544,21 +544,7 @@ int Incremental(struct mddev_dev *devlist, struct context *c,
 			cont_err("by --incremental.  Please use --assemble\n");
 			goto out;
 		}
-		if (match && match->bitmap_file) {
-			int bmfd = open(match->bitmap_file, O_RDWR);
-			if (bmfd < 0) {
-				pr_err("Could not open bitmap file %s.\n",
-				       match->bitmap_file);
-				goto out;
-			}
-			if (ioctl(mdfd, SET_BITMAP_FILE, bmfd) != 0) {
-				close(bmfd);
-				pr_err("Failed to set bitmapfile for %s.\n",
-				       chosen_name);
-				goto out;
-			}
-			close(bmfd);
-		}
+
 		/* Need to remove from the array any devices which
 		 * 'count_active' discerned were too old or inappropriate
 		 */
@@ -1400,28 +1386,7 @@ restart:
 			if (mddev->devname && me->path &&
 			    devname_matches(mddev->devname, me->path))
 				break;
-		if (mddev && mddev->bitmap_file) {
-			/*
-			 * Note: early kernels will wrongly fail this, so it
-			 * is a hint only
-			 */
-			int added = -1;
-			int bmfd;
 
-			bmfd = open(mddev->bitmap_file, O_RDWR);
-			if (is_fd_valid(bmfd)) {
-				added = ioctl(mdfd, SET_BITMAP_FILE, bmfd);
-				close_fd(&bmfd);
-			}
-			if (c->verbose >= 0) {
-				if (added == 0)
-					pr_err("Added bitmap %s to %s\n",
-					       mddev->bitmap_file, me->path);
-				else if (errno != EEXIST)
-					pr_err("Failed to add bitmap to %s: %s\n",
-					       me->path, strerror(errno));
-			}
-		}
 		/* FIXME check for reshape_active and consider not
 		 * starting array.
 		 */
diff --git a/bitmap.c b/bitmap.c
index 5110ae2f..c62d18d4 100644
--- a/bitmap.c
+++ b/bitmap.c
@@ -200,28 +200,32 @@ bitmap_file_open(char *filename, struct supertype **stp, int node_num, int fd)
 		close(fd);
 		return -1;
 	}
-	if ((stb.st_mode & S_IFMT) == S_IFBLK) {
-		/* block device, so we are probably after an internal bitmap */
-		if (!st)
-			st = guess_super(fd);
-		if (!st) {
-			/* just look at device... */
-			lseek(fd, 0, 0);
-		} else if (!st->ss->locate_bitmap) {
-			pr_err("No bitmap possible with %s metadata\n",
-				st->ss->name);
-			close(fd);
-			return -1;
-		} else {
-			if (st->ss->locate_bitmap(st, fd, node_num)) {
-				pr_err("%s doesn't have bitmap\n", filename);
-				close(fd);
-				fd = -1;
-			}
-		}
-		*stp = st;
+
+	if ((stb.st_mode & S_IFMT) != S_IFBLK) {
+		pr_err("bitmap file is not supported %s\n", filename);
+		close(fd);
+		return -1;
+	}
+
+	if (!st)
+		st = guess_super(fd);
+
+	if (!st) {
+		/* just look at device... */
+		lseek(fd, 0, 0);
+	} else if (!st->ss->locate_bitmap) {
+		pr_err("No bitmap possible with %s metadata\n", st->ss->name);
+		close(fd);
+		return -1;
+	}
+
+	if (st->ss->locate_bitmap(st, fd, node_num)) {
+		pr_err("%s doesn't have bitmap\n", filename);
+		close(fd);
+		fd = -1;
 	}
 
+	*stp = st;
 	return fd;
 }
 
diff --git a/config.c b/config.c
index 3359504d..8a8ae5e4 100644
--- a/config.c
+++ b/config.c
@@ -171,8 +171,7 @@ inline void ident_init(struct mddev_ident *ident)
 	assert(ident);
 
 	ident->assembled = false;
-	ident->bitmap_fd = -1;
-	ident->bitmap_file = NULL;
+	ident->btype = BitmapUnknown;
 	ident->container = NULL;
 	ident->devices = NULL;
 	ident->devname = NULL;
@@ -542,11 +541,19 @@ void arrayline(char *line)
 			/* Ignore name in confile */
 			continue;
 		} else if (strncasecmp(w, "bitmap=", 7) == 0) {
-			if (mis.bitmap_file)
+			if (mis.btype != BitmapUnknown)
 				pr_err("only specify bitmap file once. %s ignored\n",
 					w);
-			else
-				mis.bitmap_file = xstrdup(w + 7);
+			else {
+				char *bname = xstrdup(w + 7);
+
+				if (strcmp(bname, STR_COMMON_NONE) == 0)
+					mis.btype = BitmapNone;
+				else if (strcmp(bname, "internal") == 0)
+					mis.btype = BitmapInternal;
+				else if (strcmp(bname, "clustered") == 0)
+					mis.btype = BitmapCluster;
+			}
 
 		} else if (strncasecmp(w, "devices=", 8 ) == 0) {
 			if (mis.devices)
diff --git a/mdadm.c b/mdadm.c
index 8cb4ba66..605ccec9 100644
--- a/mdadm.c
+++ b/mdadm.c
@@ -41,18 +41,23 @@
  */
 static mdadm_status_t set_bitmap_value(struct shape *s, struct context *c, char *val)
 {
-	if (s->bitmap_file) {
+	if (s->btype != BitmapUnknown) {
 		pr_err("--bitmap cannot be set twice. Second value: \"%s\".\n", val);
 		return MDADM_STATUS_ERROR;
 	}
 
-	if (strcmp(val, "internal") == 0 || strcmp(optarg, STR_COMMON_NONE) == 0) {
-		s->bitmap_file = val;
+	if (strcmp(optarg, STR_COMMON_NONE) == 0) {
+		s->btype = BitmapNone;
+		return MDADM_STATUS_SUCCESS;
+	}
+
+	if (strcmp(val, "internal") == 0) {
+		s->btype = BitmapInternal;
 		return MDADM_STATUS_SUCCESS;
 	}
 
 	if (strcmp(val, "clustered") == 0) {
-		s->bitmap_file = val;
+		s->btype = BitmapCluster;
 		/* Set the default number of cluster nodes
 		 * to 4 if not already set by user
 		 */
@@ -62,17 +67,12 @@ static mdadm_status_t set_bitmap_value(struct shape *s, struct context *c, char
 	}
 
 	if (strchr(val, '/')) {
-		pr_info("Custom write-intent bitmap file option is deprecated.\n");
-		if (ask("Do you want to continue? (y/n)")) {
-			s->bitmap_file = val;
-			return MDADM_STATUS_SUCCESS;
-		}
-
+		pr_err("Custom write-intent bitmap file option is not supported.\n");
 		return MDADM_STATUS_ERROR;
 	}
 
-	pr_err("--bitmap value must contain a '/' or be 'internal', 'clustered' or 'none'\n");
-	pr_err("Current value is \"%s\"", val);
+	pr_err("--bitmap value must be 'internal', 'clustered' or 'none'\n");
+	pr_err("Current value is \"%s\"\n", val);
 	return MDADM_STATUS_ERROR;
 }
 
@@ -99,7 +99,6 @@ int main(int argc, char *argv[])
 	struct mddev_ident ident;
 	char *configfile = NULL;
 	int devmode = 0;
-	int bitmap_fd = -1;
 	struct mddev_dev *devlist = NULL;
 	struct mddev_dev **devlistend = & devlist;
 	struct mddev_dev *dv;
@@ -116,6 +115,7 @@ int main(int argc, char *argv[])
 		.bitmap_chunk	= UnSet,
 		.consistency_policy	= CONSISTENCY_POLICY_UNKNOWN,
 		.data_offset = INVALID_SECTORS,
+		.btype		= BitmapUnknown,
 	};
 
 	char sys_hostname[256];
@@ -1089,24 +1089,15 @@ int main(int argc, char *argv[])
 
 		case O(ASSEMBLE,'b'): /* here we simply set the bitmap file */
 		case O(ASSEMBLE,Bitmap):
-			if (!optarg) {
-				pr_err("bitmap file needed with -b in --assemble mode\n");
-				exit(2);
-			}
-			if (strcmp(optarg, "internal") == 0 ||
-			    strcmp(optarg, "clustered") == 0) {
+			if (optarg && (strcmp(optarg, "internal") == 0 ||
+				       strcmp(optarg, "clustered")) == 0) {
 				pr_err("no need to specify --bitmap when assembling"
 					" arrays with internal or clustered bitmap\n");
 				continue;
 			}
-			bitmap_fd = open(optarg, O_RDWR);
-			if (!*optarg || bitmap_fd < 0) {
-				pr_err("cannot open bitmap file %s: %s\n", optarg, strerror(errno));
-				exit(2);
-			}
-			ident.bitmap_fd = bitmap_fd; /* for Assemble */
-			continue;
 
+			pr_err("bitmap file is not supported %s\n", optarg);
+			exit(2);
 		case O(ASSEMBLE, BackupFile):
 		case O(GROW, BackupFile):
 			/* Specify a file into which grow might place a backup,
@@ -1256,12 +1247,11 @@ int main(int argc, char *argv[])
 			pr_err("PPL consistency policy is only supported for RAID level 5.\n");
 			exit(2);
 		} else if (s.consistency_policy == CONSISTENCY_POLICY_BITMAP &&
-			  (!s.bitmap_file || str_is_none(s.bitmap_file) == true)) {
+			   s.btype == BitmapNone) {
 			pr_err("--bitmap is required for consistency policy: %s\n",
 			       map_num_s(consistency_policies, s.consistency_policy));
 			exit(2);
-		} else if (s.bitmap_file &&
-			   str_is_none(s.bitmap_file) == false &&
+		} else if ((s.btype == BitmapInternal || s.btype == BitmapCluster) &&
 			   s.consistency_policy != CONSISTENCY_POLICY_BITMAP &&
 			   s.consistency_policy != CONSISTENCY_POLICY_JOURNAL) {
 			pr_err("--bitmap is not compatible with consistency policy: %s\n",
@@ -1394,7 +1384,7 @@ int main(int argc, char *argv[])
 		c.brief = 1;
 
 	if (mode == CREATE) {
-		if (s.bitmap_file && strcmp(s.bitmap_file, "clustered") == 0) {
+		if (s.btype == BitmapCluster) {
 			locked = cluster_get_dlmlock();
 			if (locked != 1)
 				exit(1);
@@ -1479,7 +1469,14 @@ int main(int argc, char *argv[])
 	case BUILD:
 		if (c.delay == 0)
 			c.delay = DEFAULT_BITMAP_DELAY;
-		if (s.write_behind && !s.bitmap_file) {
+
+		if (s.btype != BitmapNone && s.btype != BitmapUnknown) {
+			pr_err("--build argument only compatible with --bitmap=none\n");
+			rv |= 1;
+			break;
+		}
+
+		if (s.write_behind) {
 			pr_err("write-behind mode requires a bitmap.\n");
 			rv = 1;
 			break;
@@ -1490,14 +1487,6 @@ int main(int argc, char *argv[])
 			break;
 		}
 
-		if (s.bitmap_file) {
-			if (strcmp(s.bitmap_file, "internal") == 0 ||
-			    strcmp(s.bitmap_file, "clustered") == 0) {
-				pr_err("'internal' and 'clustered' bitmaps not supported with --build\n");
-				rv |= 1;
-				break;
-			}
-		}
 		rv = Build(&ident, devlist->next, &s, &c);
 		break;
 	case CREATE:
@@ -1505,8 +1494,7 @@ int main(int argc, char *argv[])
 			c.delay = DEFAULT_BITMAP_DELAY;
 
 		if (c.nodes) {
-			if (!s.bitmap_file ||
-			    strcmp(s.bitmap_file, "clustered") != 0) {
+			if (s.btype != BitmapCluster) {
 				pr_err("--nodes argument only compatible with --bitmap=clustered\n");
 				rv = 1;
 				break;
@@ -1524,7 +1512,7 @@ int main(int argc, char *argv[])
 			}
 		}
 
-		if (s.write_behind && !s.bitmap_file) {
+		if (s.write_behind && s.btype == BitmapNone) {
 			pr_err("write-behind mode requires a bitmap.\n");
 			rv = 1;
 			break;
@@ -1626,7 +1614,7 @@ int main(int argc, char *argv[])
 		if (devs_found > 1 && s.raiddisks == 0 && s.level == UnSet) {
 			/* must be '-a'. */
 			if (s.size > 0 || s.chunk ||
-			    s.layout_str || s.bitmap_file) {
+			    s.layout_str || s.btype != BitmapNone) {
 				pr_err("--add cannot be used with other geometry changes in --grow mode\n");
 				rv = 1;
 				break;
@@ -1636,7 +1624,7 @@ int main(int argc, char *argv[])
 				if (rv)
 					break;
 			}
-		} else if (s.bitmap_file) {
+		} else if (s.btype != BitmapUnknown) {
 			if (s.size > 0 || s.raiddisks || s.chunk ||
 			    s.layout_str || devs_found > 1) {
 				pr_err("--bitmap changes cannot be used with other geometry changes in --grow mode\n");
diff --git a/mdadm.h b/mdadm.h
index 5aa50854..af54a6ab 100644
--- a/mdadm.h
+++ b/mdadm.h
@@ -598,9 +598,16 @@ enum prefix_standard {
 };
 
 enum bitmap_update {
-    NoUpdate,
-    NameUpdate,
-    NodeNumUpdate,
+	NoUpdate,
+	NameUpdate,
+	NodeNumUpdate,
+};
+
+enum bitmap_type {
+	BitmapNone,
+	BitmapInternal,
+	BitmapCluster,
+	BitmapUnknown,
 };
 
 enum flag_mode {
@@ -640,8 +647,7 @@ struct mddev_ident {
 	int spare_disks;
 	struct supertype *st;
 	char	*spare_group;
-	char	*bitmap_file;
-	int	bitmap_fd;
+	enum bitmap_type btype;
 
 	char	*container;	/* /dev/whatever name of container, or
 				 * uuid of container.  You would expect
@@ -693,7 +699,7 @@ struct shape {
 	char	*layout_str;
 	int	chunk;
 	int	bitmap_chunk;
-	char	*bitmap_file;
+	enum bitmap_type btype;
 	int	assume_clean;
 	bool	write_zeroes;
 	int	write_behind;
-- 
2.39.2

[PATCH v3 4/4] Manage: forbid re-add to the array without metadata

[Yu Kuai]

From: Yu Kuai <yukuai3@huawei.com>

re-add will not trigger full disk recovery, user should add a new disk
to the array instead. Also update test/05r1-re-add-nosuper to reflect
this.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
---
 Manage.c                  | 12 ++++++++++++
 tests/05r1-re-add-nosuper | 27 +++++----------------------
 2 files changed, 17 insertions(+), 22 deletions(-)

diff --git a/Manage.c b/Manage.c
index b9e55c43..b14a9ab9 100644
--- a/Manage.c
+++ b/Manage.c
@@ -1448,6 +1448,18 @@ int Manage_subdevs(char *devname, int fd,
 		int rv, err = 0;
 		int mj, mn;
 
+		if (tst->ss->external && dv->disposition == 'A') {
+			pr_err("Cannot re-add member device %s to %s, it is not supported for external metadata, aborting.\n",
+			       dv->devname, fd2devnm(fd));
+			goto abort;
+		}
+
+		if (array.not_persistent == 1 && dv->disposition == 'A') {
+			pr_err("Cannot re-add member device %s to %s, array is not persistent, aborting.\n",
+			       dv->devname, fd2devnm(fd));
+			goto abort;
+		}
+
 		raid_slot = -1;
 		if (dv->disposition == 'c') {
 			rv = parse_cluster_confirm_arg(dv->devname, &dv->devname, &raid_slot);
diff --git a/tests/05r1-re-add-nosuper b/tests/05r1-re-add-nosuper
index a3fa9503..750d7c14 100644
--- a/tests/05r1-re-add-nosuper
+++ b/tests/05r1-re-add-nosuper
@@ -1,7 +1,6 @@
 #
-# create a raid1, remove a drive, and readd it.
-# resync should be instant.
-# Then do some IO first.  Resync should still be very fast
+# create a raid1 without superblock, remove a drive, and readd it.
+# readd should fail.
 #
 mdadm -B $md0 -l1 -n2 -d1 $dev1 $dev2
 check resync
@@ -12,24 +11,8 @@ sleep 4
 mdadm $md0 -f $dev2
 sleep 1
 mdadm $md0 -r $dev2
-mdadm $md0 --re-add $dev2
-check nosync
+if mdadm $md0 --re-add $dev2; then
+	err "re-add should fail"
+fi
 
-mdadm $md0 -f $dev2
-sleep 1
-mdadm $md0 -r $dev2
-testdev $md0 1 $size 1
-mdadm $md0 --re-add $dev2
-check wait
-cmp --bytes=$[$mdsize0*1024] $dev1 $dev2
-
-mdadm $md0 -f $dev2; sleep 1
-mdadm $md0 -r $dev2
-if dd if=/dev/zero of=$md0 ; then : ; fi
-blockdev --flushbufs $md0 # make sure writes have been sent
-mdadm $md0 --re-add $dev2
-check recovery
-check wait
-# should BLKFLSBUF and then read $dev1/$dev2...
-cmp --bytes=$[$mdsize0*1024] $file1 $file2
 mdadm -S $md0
-- 
2.39.2

Re: [PATCH v3 3/4] mdadm: remove bitmap file support

[Mariusz Tkaczyk]

On Wed, 20 Nov 2024 14:46:36 +0800
Yu Kuai <yukuai1@huaweicloud.com> wrote:

> From: Yu Kuai <yukuai3@huawei.com>
> 
> Because it's marked deprecated for a long time now, and it's not worthy
> to support it for new bitmap.
> 
> Now that we don't need to store filename for bitmap, also declare a new
> enum type bitmap_type to simplify code.

Thanks for the enum! I really appreciate the additional effort you took to
make mdadm better.

I didn't not review it line by line because I see the problem that must
be resolved first.

I see that you added BitmapNone and BitmapUnknown and their usage is not clear,
let me help you!

BitmapUnknown should be used only if we failed to parse bitmap setting in
cmdline. Otherwise first and default value should be always BitmapNone
because data access is always highest priority and dropping bitmap is always
safe. We can print warning in config parse failed or bitmap value is repeated-
it is reasonable. If I'm wrong here, please let me know.

+ It would be nice to add tests to cover these config/cmdline bitmap
  possibilities to define clear set of expected behavior. It is something
  already missed so I do not require that strongly from you know.

I propose you to create mapping_t for bitmap and to use map_name() to match the
bitmap strings, instead of hardcoding them but it is my recommendation not
something strongly required.

Then, you would be able to remove some checks for both (s->btype != BitmapNone
&& s->btype != BitmapUnknown).

The change proposed by my will provide clear differentiation between error
value and set of accepted values, messing that is always confusing for
maintainers end readers. I don't see that kind of mess necessary in this case.

Thanks,
Mariusz

Re: [PATCH v3 4/4] Manage: forbid re-add to the array without metadata

[Mariusz Tkaczyk]

On Wed, 20 Nov 2024 14:46:37 +0800
Yu Kuai <yukuai1@huaweicloud.com> wrote:

> From: Yu Kuai <yukuai3@huawei.com>
> 
> re-add will not trigger full disk recovery, user should add a new disk
> to the array instead. Also update test/05r1-re-add-nosuper to reflect
> this.
> 

Description miss information about blocking --re-add for external :)

Please add something. I know it is not supported, I just need some note like:
"I was never supported for external metadata and behavior is undefined? (please
check at least with IMSM), block it"

If it fallbacks to standard --add I'm also fine with the change because we are
making clear user interface and this will be help to avoid abuses and bug
reports. Probably no one is using that with external- I think we can take a
risk here.

For the code, LGTM.

Thanks!
Mariusz

Re: [PATCH v3 3/4] mdadm: remove bitmap file support

[Yu Kuai]

Hi,

在 2024/11/20 18:27, Mariusz Tkaczyk 写道:
> On Wed, 20 Nov 2024 14:46:36 +0800
> Yu Kuai <yukuai1@huaweicloud.com> wrote:
> 
>> From: Yu Kuai <yukuai3@huawei.com>
>>
>> Because it's marked deprecated for a long time now, and it's not worthy
>> to support it for new bitmap.
>>
>> Now that we don't need to store filename for bitmap, also declare a new
>> enum type bitmap_type to simplify code.
> 
> Thanks for the enum! I really appreciate the additional effort you took to
> make mdadm better.
> 
> I didn't not review it line by line because I see the problem that must
> be resolved first.
> 
> I see that you added BitmapNone and BitmapUnknown and their usage is not clear,
> let me help you!

Yeah, BitmapUnknow is used to match bitmap=NULL, and BitmapNonw is used
to match bitmap="none" before this patch.
> 
> BitmapUnknown should be used only if we failed to parse bitmap setting in
> cmdline. Otherwise first and default value should be always BitmapNone
> because data access is always highest priority and dropping bitmap is always
> safe. We can print warning in config parse failed or bitmap value is repeated-
> it is reasonable. If I'm wrong here, please let me know.

Hi, there is a little difference betewwn BitmapNone and BitmapUnknow, if
user doesn't pass in the "bitmap=xxx", then the BitmapUnkonw will be
used to decide choosing BitmapNone or BimtapInternal based on the disk
size. In Create:

         if (!s->bitmap_file &&
         ┊   !st->ss->external &&
         ┊   s->level >= 1 &&
         ┊   st->ss->add_internal_bitmap &&
         ┊   s->journaldisks == 0 &&
         ┊   (s->consistency_policy != CONSISTENCY_POLICY_RESYNC &&
         ┊    s->consistency_policy != CONSISTENCY_POLICY_PPL) &&
         ┊   (s->write_behind || s->size > 100*1024*1024ULL)) {
                 if (c->verbose > 0)
                         pr_err("automatically enabling write-intent 
bitmap on large array\n");
                 s->bitmap_file = "internal";
         }

And I realized that I should used BitmapUnknow here, not BimtapNone.

> 
> + It would be nice to add tests to cover these config/cmdline bitmap
>    possibilities to define clear set of expected behavior. It is something
>    already missed so I do not require that strongly from you know.

That's fine, just we need 100GB+ disk for the above default choice.

Thanks,
Kuai

> 
> I propose you to create mapping_t for bitmap and to use map_name() to match the
> bitmap strings, instead of hardcoding them but it is my recommendation not
> something strongly required.
> 
> Then, you would be able to remove some checks for both (s->btype != BitmapNone
> && s->btype != BitmapUnknown).
> 
> The change proposed by my will provide clear differentiation between error
> value and set of accepted values, messing that is always confusing for
> maintainers end readers. I don't see that kind of mess necessary in this case.
> 
> Thanks,
> Mariusz
> 
> .
> 

Re: [PATCH v3 3/4] mdadm: remove bitmap file support

[Mariusz Tkaczyk]

On Thu, 21 Nov 2024 09:25:50 +0800
Yu Kuai <yukuai1@huaweicloud.com> wrote:

> > BitmapUnknown should be used only if we failed to parse bitmap setting in
> > cmdline. Otherwise first and default value should be always BitmapNone
> > because data access is always highest priority and dropping bitmap is always
> > safe. We can print warning in config parse failed or bitmap value is
> > repeated- it is reasonable. If I'm wrong here, please let me know.  
> 
> Hi, there is a little difference betewwn BitmapNone and BitmapUnknow, if
> user doesn't pass in the "bitmap=xxx", then the BitmapUnkonw will be
> used to decide choosing BitmapNone or BimtapInternal based on the disk
> size. In Create:
> 
>          if (!s->bitmap_file &&
>          ┊   !st->ss->external &&
>          ┊   s->level >= 1 &&
>          ┊   st->ss->add_internal_bitmap &&
>          ┊   s->journaldisks == 0 &&
>          ┊   (s->consistency_policy != CONSISTENCY_POLICY_RESYNC &&
>          ┊    s->consistency_policy != CONSISTENCY_POLICY_PPL) &&
>          ┊   (s->write_behind || s->size > 100*1024*1024ULL)) {
>                  if (c->verbose > 0)
>                          pr_err("automatically enabling write-intent 
> bitmap on large array\n");
>                  s->bitmap_file = "internal";
>          }
> 
> And I realized that I should used BitmapUnknow here, not BimtapNone.

Oh yes.. Looking on that from the interface perspective suggest me that we
should remove it and always let user to decide. If the are not satisfied with
resync times they can enable bitmap in any moment but it may cause functional
regression for users that are used to this auto turning on.

Maybe, we can move it to main() and ask without checking raid size, assuming
that array size <100GB is used mainly for testing nowadays?

Here, proposal based on current code, your change may require some adjustments:

diff --git a/mdadm.c b/mdadm.c
index 8cb4ba66ac20..2e803d441dd4 100644
--- a/mdadm.c
+++ b/mdadm.c
@@ -1535,6 +1535,13 @@ int main(int argc, char *argv[])
                        break;
                }

+               if (!s->bitmap_file && !c.runstop != 1 && s->level >= 1) {
+                       int response = ask("To optimalize resync speed, it is
  recommended to enable write-indent bitmap, do you want to enable it now?");
+
+                       if (response)
+                               s->bitmap_file = "internal";
+               }
+
                rv = Create(ss, &ident, devs_found - 1, devlist->next, &s, &c);
                break;
        case MISC:

This is more reasonable than auto-forcing bitmap without possibility
to skip it (even for testing). I added c->runstop verification because it is
often used in Create to skip some errors and questions.

What do you think?

Thanks,
Mariusz

Re: [PATCH v3 3/4] mdadm: remove bitmap file support

[Yu Kuai]

在 2024/11/21 16:15, Mariusz Tkaczyk 写道:
> On Thu, 21 Nov 2024 09:25:50 +0800
> Yu Kuai <yukuai1@huaweicloud.com> wrote:
> 
>>> BitmapUnknown should be used only if we failed to parse bitmap setting in
>>> cmdline. Otherwise first and default value should be always BitmapNone
>>> because data access is always highest priority and dropping bitmap is always
>>> safe. We can print warning in config parse failed or bitmap value is
>>> repeated- it is reasonable. If I'm wrong here, please let me know.
>>
>> Hi, there is a little difference betewwn BitmapNone and BitmapUnknow, if
>> user doesn't pass in the "bitmap=xxx", then the BitmapUnkonw will be
>> used to decide choosing BitmapNone or BimtapInternal based on the disk
>> size. In Create:
>>
>>           if (!s->bitmap_file &&
>>           ┊   !st->ss->external &&
>>           ┊   s->level >= 1 &&
>>           ┊   st->ss->add_internal_bitmap &&
>>           ┊   s->journaldisks == 0 &&
>>           ┊   (s->consistency_policy != CONSISTENCY_POLICY_RESYNC &&
>>           ┊    s->consistency_policy != CONSISTENCY_POLICY_PPL) &&
>>           ┊   (s->write_behind || s->size > 100*1024*1024ULL)) {
>>                   if (c->verbose > 0)
>>                           pr_err("automatically enabling write-intent
>> bitmap on large array\n");
>>                   s->bitmap_file = "internal";
>>           }
>>
>> And I realized that I should used BitmapUnknow here, not BimtapNone.
> 
> Oh yes.. Looking on that from the interface perspective suggest me that we
> should remove it and always let user to decide. If the are not satisfied with
> resync times they can enable bitmap in any moment but it may cause functional
> regression for users that are used to this auto turning on.
> 
> Maybe, we can move it to main() and ask without checking raid size, assuming
> that array size <100GB is used mainly for testing nowadays?
> 
> Here, proposal based on current code, your change may require some adjustments:
> 
> diff --git a/mdadm.c b/mdadm.c
> index 8cb4ba66ac20..2e803d441dd4 100644
> --- a/mdadm.c
> +++ b/mdadm.c
> @@ -1535,6 +1535,13 @@ int main(int argc, char *argv[])
>                          break;
>                  }
> 
> +               if (!s->bitmap_file && !c.runstop != 1 && s->level >= 1) {
> +                       int response = ask("To optimalize resync speed, it is
>    recommended to enable write-indent bitmap, do you want to enable it now?");
> +
> +                       if (response)
> +                               s->bitmap_file = "internal";
> +               }
> +
>                  rv = Create(ss, &ident, devs_found - 1, devlist->next, &s, &c);
>                  break;
>          case MISC:
> 
> This is more reasonable than auto-forcing bitmap without possibility
> to skip it (even for testing). I added c->runstop verification because it is
> often used in Create to skip some errors and questions.
> 
> What do you think?

I think it's good! I used to be curious why bitmap is not enabled by
default for testing, and have to look into the source code.

Thanks,
Kuai

> 
> Thanks,
> Mariusz
> 
> .
> 

Re: [PATCH v3 3/4] mdadm: remove bitmap file support

[Mariusz Tkaczyk]

On Fri, 22 Nov 2024 09:13:18 +0800
Yu Kuai <yukuai1@huaweicloud.com> wrote:

> 在 2024/11/21 16:15, Mariusz Tkaczyk 写道:
> > On Thu, 21 Nov 2024 09:25:50 +0800
> > Yu Kuai <yukuai1@huaweicloud.com> wrote:
> >   
> >>> BitmapUnknown should be used only if we failed to parse bitmap setting in
> >>> cmdline. Otherwise first and default value should be always BitmapNone
> >>> because data access is always highest priority and dropping bitmap is
> >>> always safe. We can print warning in config parse failed or bitmap value
> >>> is repeated- it is reasonable. If I'm wrong here, please let me know.  
> >>
> >> Hi, there is a little difference betewwn BitmapNone and BitmapUnknow, if
> >> user doesn't pass in the "bitmap=xxx", then the BitmapUnkonw will be
> >> used to decide choosing BitmapNone or BimtapInternal based on the disk
> >> size. In Create:
> >>
> >>           if (!s->bitmap_file &&
> >>           ┊   !st->ss->external &&
> >>           ┊   s->level >= 1 &&
> >>           ┊   st->ss->add_internal_bitmap &&
> >>           ┊   s->journaldisks == 0 &&
> >>           ┊   (s->consistency_policy != CONSISTENCY_POLICY_RESYNC &&
> >>           ┊    s->consistency_policy != CONSISTENCY_POLICY_PPL) &&
> >>           ┊   (s->write_behind || s->size > 100*1024*1024ULL)) {
> >>                   if (c->verbose > 0)
> >>                           pr_err("automatically enabling write-intent
> >> bitmap on large array\n");
> >>                   s->bitmap_file = "internal";
> >>           }
> >>
> >> And I realized that I should used BitmapUnknow here, not BimtapNone.  
> > 
> > Oh yes.. Looking on that from the interface perspective suggest me that we
> > should remove it and always let user to decide. If the are not satisfied
> > with resync times they can enable bitmap in any moment but it may cause
> > functional regression for users that are used to this auto turning on.
> > 
> > Maybe, we can move it to main() and ask without checking raid size, assuming
> > that array size <100GB is used mainly for testing nowadays?
> > 
> > Here, proposal based on current code, your change may require some
> > adjustments:
> > 
> > diff --git a/mdadm.c b/mdadm.c
> > index 8cb4ba66ac20..2e803d441dd4 100644
> > --- a/mdadm.c
> > +++ b/mdadm.c
> > @@ -1535,6 +1535,13 @@ int main(int argc, char *argv[])
> >                          break;
> >                  }
> > 
> > +               if (!s->bitmap_file && !c.runstop != 1 && s->level >= 1) {
> > +                       int response = ask("To optimalize resync speed, it
> > is recommended to enable write-indent bitmap, do you want to enable it
> > now?"); +
> > +                       if (response)
> > +                               s->bitmap_file = "internal";
> > +               }
> > +
> >                  rv = Create(ss, &ident, devs_found - 1, devlist->next, &s,
> > &c); break;
> >          case MISC:
> > 
> > This is more reasonable than auto-forcing bitmap without possibility
> > to skip it (even for testing). I added c->runstop verification because it is
> > often used in Create to skip some errors and questions.
> > 
> > What do you think?  
> 
> I think it's good! I used to be curious why bitmap is not enabled by
> default for testing, and have to look into the source code.
> 
One note here (this one is easy to be missed):
If user set --bitmap=None we should not prompt this question, assuming that user
already made his decision. You need to differentiate default BitmapNone
and user defined BitmapNone (boolean is_bitmap_set should be fine, because
adding another enum status is not valuable I think).

Mariusz

Re: [PATCH v3 3/4] mdadm: remove bitmap file support

[Yu Kuai]

Hi,

在 2024/11/22 15:55, Mariusz Tkaczyk 写道:
> On Fri, 22 Nov 2024 09:13:18 +0800
> Yu Kuai <yukuai1@huaweicloud.com> wrote:
> 
>> 在 2024/11/21 16:15, Mariusz Tkaczyk 写道:
>>> On Thu, 21 Nov 2024 09:25:50 +0800
>>> Yu Kuai <yukuai1@huaweicloud.com> wrote:
>>>    
>>>>> BitmapUnknown should be used only if we failed to parse bitmap setting in
>>>>> cmdline. Otherwise first and default value should be always BitmapNone
>>>>> because data access is always highest priority and dropping bitmap is
>>>>> always safe. We can print warning in config parse failed or bitmap value
>>>>> is repeated- it is reasonable. If I'm wrong here, please let me know.
>>>>
>>>> Hi, there is a little difference betewwn BitmapNone and BitmapUnknow, if
>>>> user doesn't pass in the "bitmap=xxx", then the BitmapUnkonw will be
>>>> used to decide choosing BitmapNone or BimtapInternal based on the disk
>>>> size. In Create:
>>>>
>>>>            if (!s->bitmap_file &&
>>>>            ┊   !st->ss->external &&
>>>>            ┊   s->level >= 1 &&
>>>>            ┊   st->ss->add_internal_bitmap &&
>>>>            ┊   s->journaldisks == 0 &&
>>>>            ┊   (s->consistency_policy != CONSISTENCY_POLICY_RESYNC &&
>>>>            ┊    s->consistency_policy != CONSISTENCY_POLICY_PPL) &&
>>>>            ┊   (s->write_behind || s->size > 100*1024*1024ULL)) {
>>>>                    if (c->verbose > 0)
>>>>                            pr_err("automatically enabling write-intent
>>>> bitmap on large array\n");
>>>>                    s->bitmap_file = "internal";
>>>>            }
>>>>
>>>> And I realized that I should used BitmapUnknow here, not BimtapNone.
>>>
>>> Oh yes.. Looking on that from the interface perspective suggest me that we
>>> should remove it and always let user to decide. If the are not satisfied
>>> with resync times they can enable bitmap in any moment but it may cause
>>> functional regression for users that are used to this auto turning on.
>>>
>>> Maybe, we can move it to main() and ask without checking raid size, assuming
>>> that array size <100GB is used mainly for testing nowadays?
>>>
>>> Here, proposal based on current code, your change may require some
>>> adjustments:
>>>
>>> diff --git a/mdadm.c b/mdadm.c
>>> index 8cb4ba66ac20..2e803d441dd4 100644
>>> --- a/mdadm.c
>>> +++ b/mdadm.c
>>> @@ -1535,6 +1535,13 @@ int main(int argc, char *argv[])
>>>                           break;
>>>                   }
>>>
>>> +               if (!s->bitmap_file && !c.runstop != 1 && s->level >= 1) {
>>> +                       int response = ask("To optimalize resync speed, it
>>> is recommended to enable write-indent bitmap, do you want to enable it
>>> now?"); +
>>> +                       if (response)
>>> +                               s->bitmap_file = "internal";
>>> +               }
>>> +
>>>                   rv = Create(ss, &ident, devs_found - 1, devlist->next, &s,
>>> &c); break;
>>>           case MISC:
>>>
>>> This is more reasonable than auto-forcing bitmap without possibility
>>> to skip it (even for testing). I added c->runstop verification because it is
>>> often used in Create to skip some errors and questions.
>>>
>>> What do you think?
>>
>> I think it's good! I used to be curious why bitmap is not enabled by
>> default for testing, and have to look into the source code.
>>
> One note here (this one is easy to be missed):
> If user set --bitmap=None we should not prompt this question, assuming that user
> already made his decision. You need to differentiate default BitmapNone
> and user defined BitmapNone (boolean is_bitmap_set should be fine, because
> adding another enum status is not valuable I think).

TBO, I'll prefer keep the BitmapUnknow for initiazation. Only prompt
this question for BitmapUnknow, and switch to none or internal for
response.

Thanks,
Kuai

> 
> Mariusz
> 
> 
> .
>