On Thu, 2006-03-30 at 11:16 -0800, Mingming Cao wrote:
> On Thu, 2006-03-30 at 10:40 -0700, Andreas Dilger wrote:
> > On Mar 29, 2006 17:38 -0800, Mingming Cao wrote:
> > > Have verified these two patches on a 64 bit machine with 10TB ext3
> > > filesystem, fsx runs fine for a few hours. Also testes on 32 bit machine
> > > with <8TB ext3.
> >
> > Have you done tests _near_ 8TB with a 32-bit machine, even without these
> > patches?
> No I haven't. The >8TB right now is attached to a 64 bit machine, but we
> should able to move it to a 32 bit machine.
>
> > In particular, filling up the filesystem to be close to full
> > so that we really depend on the > 2TB code to work properly?
>
> I made a kernel patch to allow a file to specify which block group it
> wants it's blocks to allocate from(using ioctl to set the goal
> allocation block group). I set the goal block group falls to somewhere
> >8TB, and did dd tests on that file. Verified this with debugfs, the
> allocated block numbers are beyond 2**31.
>
> Also before run fsx tests, created many directories (32768 at most:) and
> verified one directory's inode is located in block group >8TB space. So
> when we do fsx test on files under that directory, we are
> creating/testing files >8TB.
>
> BTW, do you think this ioctl is useful in general for other users? I
> attached the patch here.
>
---
linux-2.6.16-ming/fs/ext3/balloc.c | 24 ++++++++++++++---------
linux-2.6.16-ming/fs/ext3/ioctl.c | 29 ++++++++++++++++++++++++++++
linux-2.6.16-ming/include/linux/ext3_fs.h | 1
linux-2.6.16-ming/include/linux/ext3_fs_i.h | 1
4 files changed, 46 insertions(+), 9 deletions(-)
diff -puN fs/ext3/ioctl.c~ext3_set_alloc_blk_group_hack fs/ext3/ioctl.c
--- linux-2.6.16/fs/ext3/ioctl.c~ext3_set_alloc_blk_group_hack 2006-03-28 15:19:58.000000000 -0800
+++ linux-2.6.16-ming/fs/ext3/ioctl.c 2006-03-28 15:54:14.000000000 -0800
@@ -22,6 +22,7 @@ int ext3_ioctl (struct inode * inode, st
struct ext3_inode_info *ei = EXT3_I(inode);
unsigned int flags;
unsigned short rsv_window_size;
+ unsigned int blk_group;
ext3_debug ("cmd = %u, arg = %lu\n", cmd, arg);
@@ -193,6 +194,34 @@ flags_err:
mutex_unlock(&ei->truncate_mutex);
return 0;
}
+ case EXT3_IOC_SETALLOCBLKGRP: {
+
+ if (!test_opt(inode->i_sb, RESERVATION) ||!S_ISREG(inode->i_mode))
+ return -ENOTTY;
+
+ if (IS_RDONLY(inode))
+ return -EROFS;
+
+ if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
+ return -EACCES;
+
+ if (get_user(blk_group, (int __user *)arg))
+ return -EFAULT;
+
+ /*
+ * need to allocate reservation structure for this inode
+ * before set the window size
+ */
+ mutex_lock(&ei->truncate_mutex);
+ if (!ei->i_block_alloc_info)
+ ext3_init_block_alloc_info(inode);
+
+ if (ei->i_block_alloc_info){
+ ei->i_block_alloc_info->goal_block_group = blk_group;
+ }
+ mutex_unlock(&ei->truncate_mutex);
+ return 0;
+ }
case EXT3_IOC_GROUP_EXTEND: {
unsigned long n_blocks_count;
struct super_block *sb = inode->i_sb;
diff -puN include/linux/ext3_fs.h~ext3_set_alloc_blk_group_hack include/linux/ext3_fs.h
--- linux-2.6.16/include/linux/ext3_fs.h~ext3_set_alloc_blk_group_hack 2006-03-28 15:42:51.000000000 -0800
+++ linux-2.6.16-ming/include/linux/ext3_fs.h 2006-03-28 15:51:48.000000000 -0800
@@ -238,6 +238,7 @@ struct ext3_new_group_data {
#endif
#define EXT3_IOC_GETRSVSZ _IOR('f', 5, long)
#define EXT3_IOC_SETRSVSZ _IOW('f', 6, long)
+#define EXT3_IOC_SETALLOCBLKGRP _IOW('f', 9, long)
/*
* Mount options
diff -puN include/linux/ext3_fs_i.h~ext3_set_alloc_blk_group_hack include/linux/ext3_fs_i.h
--- linux-2.6.16/include/linux/ext3_fs_i.h~ext3_set_alloc_blk_group_hack 2006-03-28 15:43:59.000000000 -0800
+++ linux-2.6.16-ming/include/linux/ext3_fs_i.h 2006-03-28 15:47:54.000000000 -0800
@@ -51,6 +51,7 @@ struct ext3_block_alloc_info {
* allocation when we detect linearly ascending requests.
*/
__u32 last_alloc_physical_block;
+ __u32 goal_block_group;
};
#define rsv_start rsv_window._rsv_start
diff -puN fs/ext3/balloc.c~ext3_set_alloc_blk_group_hack fs/ext3/balloc.c
--- linux-2.6.16/fs/ext3/balloc.c~ext3_set_alloc_blk_group_hack 2006-03-28 15:45:30.000000000 -0800
+++ linux-2.6.16-ming/fs/ext3/balloc.c 2006-03-28 16:03:55.000000000 -0800
@@ -285,6 +285,7 @@ void ext3_init_block_alloc_info(struct i
rsv->rsv_alloc_hit = 0;
block_i->last_alloc_logical_block = 0;
block_i->last_alloc_physical_block = 0;
+ block_i->goal_block_group = 0;
}
ei->i_block_alloc_info = block_i;
}
@@ -1263,15 +1264,20 @@ unsigned long ext3_new_blocks(handle_t *
*errp = -ENOSPC;
goto out;
}
-
- /*
- * First, test whether the goal block is free.
- */
- if (goal < le32_to_cpu(es->s_first_data_block) ||
- goal >= le32_to_cpu(es->s_blocks_count))
- goal = le32_to_cpu(es->s_first_data_block);
- group_no = (goal - le32_to_cpu(es->s_first_data_block)) /
- EXT3_BLOCKS_PER_GROUP(sb);
+ if (block_i->goal_block_group) {
+ group_no = block_i->goal_block_group;
+ goal = le32_to_cpu(EXT3_SB(sb)->s_es->s_first_data_block) + group_no * EXT3_BLOCKS_PER_GROUP(sb);
+ block_i->goal_block_group = 0;
+ } else {
+ /*
+ * First, test whether the goal block is free.
+ */
+ if (goal < le32_to_cpu(es->s_first_data_block) ||
+ goal >= le32_to_cpu(es->s_blocks_count))
+ goal = le32_to_cpu(es->s_first_data_block);
+ group_no = (goal - le32_to_cpu(es->s_first_data_block)) /
+ EXT3_BLOCKS_PER_GROUP(sb);
+ }
gdp = ext3_get_group_desc(sb, group_no, &gdp_bh);
if (!gdp)
goto io_error;
_
-
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