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Date: Fri, 18 May 2007 22:08:41 -0400
From: Theodore Tso <tytso@....edu>
To: Andreas Dilger <adilger@...sterfs.com>
Cc: linux-ext4@...r.kernel.org
Subject: Re: [RFC] store RAID stride in superblock
On Fri, May 11, 2007 at 07:02:48PM -0700, Andreas Dilger wrote:
> It is possible to specify the RAID stride to mke2fs allow it to optimize
> the layout of the bitmaps. With the new mballoc it is also possible to
> tell it via a mount option to do large allocations aligned on the RAID
> stride (by default it aligns on 1MB boundaries from the start of the LUN).
You asked for it, you got it.
- Ted
# HG changeset patch
# User tytso@....edu
# Date 1179540413 14400
# Node ID 2afd1c039d26aaa66c55ede30770df1990392f84
# Parent f95d161b454ec94e8974946d38e3e94c612f2cd2
Store the RAID stride value in the superblock and take advantage of it
Store the RAID stride value when a filesystem is created with a requested
RAID stride, and then use it automatically in resize2fs.
Signed-off-by: "Theodore Ts'o" <tytso@....edu>
diff -r f95d161b454e -r 2afd1c039d26 lib/ext2fs/ChangeLog
--- a/lib/ext2fs/ChangeLog Fri May 18 21:44:29 2007 -0400
+++ b/lib/ext2fs/ChangeLog Fri May 18 22:06:53 2007 -0400
@@ -1,3 +1,10 @@ 2007-05-08 Eric Sandeen <sandeen@...hat
+2007-05-18 Theodore Tso <tytso@....edu>
+
+ * openfs.c (ext2fs_open2): Set fs->stride from the superblock's
+ s_raid_stride value.
+
+ * ext2_fs.h: Allocate space for RAID stride in the superblock.
+
2007-05-08 Eric Sandeen <sandeen@...hat.com>
* ext2_fs.h (inode_uid, inode_gid): The inode_uid() and
diff -r f95d161b454e -r 2afd1c039d26 lib/ext2fs/ext2_fs.h
--- a/lib/ext2fs/ext2_fs.h Fri May 18 21:44:29 2007 -0400
+++ b/lib/ext2fs/ext2_fs.h Fri May 18 22:06:53 2007 -0400
@@ -573,7 +573,9 @@ struct ext2_super_block {
__u16 s_min_extra_isize; /* All inodes have at least # bytes */
__u16 s_want_extra_isize; /* New inodes should reserve # bytes */
__u32 s_flags; /* Miscellaneous flags */
- __u32 s_reserved[167]; /* Padding to the end of the block */
+ __u16 s_raid_stride; /* RAID stride */
+ __u16 s_pad; /* Padding */
+ __u32 s_reserved[166]; /* Padding to the end of the block */
};
/*
diff -r f95d161b454e -r 2afd1c039d26 lib/ext2fs/openfs.c
--- a/lib/ext2fs/openfs.c Fri May 18 21:44:29 2007 -0400
+++ b/lib/ext2fs/openfs.c Fri May 18 22:06:53 2007 -0400
@@ -297,6 +297,8 @@ errcode_t ext2fs_open2(const char *name,
dest += fs->blocksize;
}
+ fs->stride = fs->super->s_raid_stride;
+
*ret_fs = fs;
return 0;
cleanup:
diff -r f95d161b454e -r 2afd1c039d26 misc/ChangeLog
--- a/misc/ChangeLog Fri May 18 21:44:29 2007 -0400
+++ b/misc/ChangeLog Fri May 18 22:06:53 2007 -0400
@@ -1,4 +1,6 @@ 2007-05-18 Theodore Tso <tytso@....edu
2007-05-18 Theodore Tso <tytso@....edu>
+
+ * mke2fs.c (main): Save the raid stride to the superblock
* blkid.c (main): Add -g option to blkid which will garbage
collect the cache.
diff -r f95d161b454e -r 2afd1c039d26 misc/mke2fs.c
--- a/misc/mke2fs.c Fri May 18 21:44:29 2007 -0400
+++ b/misc/mke2fs.c Fri May 18 22:06:53 2007 -0400
@@ -1611,7 +1611,7 @@ int main (int argc, char *argv[])
test_disk(fs, &bb_list);
handle_bad_blocks(fs, bb_list);
- fs->stride = fs_stride;
+ fs->stride = fs->super->s_raid_stride = fs_stride;
retval = ext2fs_allocate_tables(fs);
if (retval) {
com_err(program_name, retval,
diff -r f95d161b454e -r 2afd1c039d26 resize/ChangeLog
--- a/resize/ChangeLog Fri May 18 21:44:29 2007 -0400
+++ b/resize/ChangeLog Fri May 18 22:06:53 2007 -0400
@@ -1,3 +1,9 @@ 2007-03-18 Theodore Tso <tytso@....edu
+2007-05-18 Theodore Tso <tytso@....edu>
+
+ * main.c (determine_fs_stride): Use the superblock s_raid_stride
+ if it is set; save the hueristically determined stride to
+ the superblock if it is not set.
+
2007-03-18 Theodore Tso <tytso@....edu>
* resize2fs.c (check_and_change_inodes): Check to make sure the
diff -r f95d161b454e -r 2afd1c039d26 resize/main.c
--- a/resize/main.c Fri May 18 21:44:29 2007 -0400
+++ b/resize/main.c Fri May 18 22:06:53 2007 -0400
@@ -101,6 +101,8 @@ static void determine_fs_stride(ext2_fil
unsigned int has_sb, prev_has_sb, num;
int i_stride, b_stride;
+ if (fs->stride)
+ return;
num = 0; sum = 0;
for (group = 0; group < fs->group_desc_count; group++) {
has_sb = ext2fs_bg_has_super(fs, group);
@@ -131,6 +133,9 @@ static void determine_fs_stride(ext2_fil
fs->stride = sum / num;
else
fs->stride = 0;
+
+ fs->super->s_raid_stride = fs->stride;
+ ext2fs_mark_super_dirty(fs);
#if 0
if (fs->stride)
@@ -348,7 +353,8 @@ int main (int argc, char ** argv)
_("Invalid stride length"));
exit(1);
}
- fs->stride = use_stride;
+ fs->stride = fs->super->s_raid_stride = use_stride;
+ ext2fs_mark_super_dirty(fs);
} else
determine_fs_stride(fs);
-
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