Re: + ext4-uninitialized-block-groups-fix.patch added to -mm tree
[EMAIL PROTECTED] wrote:
The patch titled
Ext4: Uninitialized Block Groups (fix)
has been added to the -mm tree. Its filename is
ext4-uninitialized-block-groups-fix.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
--
Subject: Ext4: Uninitialized Block Groups (fix)
From: Avantika Mathur <[EMAIL PROTECTED]>
Andreas Dilger wrote:
On Sep 18, 2007 20:03 -0700, Andrew Morton wrote:
On Tue, 18 Sep 2007 17:25:31 -0700 Avantika Mathur <[EMAIL PROTECTED]> wrote:
+#if !defined(CONFIG_CRC16)
+/** CRC table for the CRC-16. The poly is 0x8005 (x16 + x15 + x2 + 1) */
+__u16 const crc16_table[256] = { me
+ 0x, 0xC0C1, 0xC181, 0x0140, 0xC301, 0x03C0, 0x0280, 0xC241,
That's rather sad. A plain old "depends on" would be better.
My bad. We wrote this patch and it had to run on older kernels that might
not even have lib/crc16.c (it was added around 2.6.15 or so, so e.g. RHEL4
doesn't have it). I forgot to remove it from the upstream submission,
and since it didn't cause problems nobody else complained...
The incremental patch below removes the local crc16 code, and also resolves an
issue with properly updating bg_itable_unused when an inode is allocated in an
unused block groups.
Cc: Andreas Dilger <[EMAIL PROTECTED]>
Cc: Avantika Mathur <[EMAIL PROTECTED]>
Cc: Mingming Cao <[EMAIL PROTECTED]>
Cc: Aneesh Kumar K.V <[EMAIL PROTECTED]>
Cc:
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
Signed-off-by: Aneesh Kumar K.V <[EMAIL PROTECTED]>
---
fs/Kconfig |1
fs/ext4/ialloc.c |8 ++-
fs/ext4/super.c | 51 -
3 files changed, 9 insertions(+), 51 deletions(-)
diff -puN fs/ext4/ialloc.c~ext4-uninitialized-block-groups-fix fs/ext4/ialloc.c
--- a/fs/ext4/ialloc.c~ext4-uninitialized-block-groups-fix
+++ a/fs/ext4/ialloc.c
@@ -632,12 +632,18 @@ got:
if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
if (gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_UNINIT)) {
gdp->bg_flags &= cpu_to_le16(~EXT4_BG_INODE_UNINIT);
- free = EXT4_INODES_PER_GROUP(sb);
I guess a comment as below would help to explain why are we not decrementing
bg_itable_unused by 1.
/* When marking the block group with ~EXT4_BG_INODE_UNINIT we don't want to
depend
* on the value of bg_itable_unsed even though mke2fs could have initialized the
* same for us. Instead we calculated the value below
*/
+ free = 0;
} else {
free = EXT4_INODES_PER_GROUP(sb) -
le16_to_cpu(gdp->bg_itable_unused);
}
+ /*
+* Check the relative inode number against the last used
+* relative inode number in this group. if it is greater
+* we need to update the bg_itable_unused count
+*
+*/
if (ino > free)
gdp->bg_itable_unused =
cpu_to_le16(EXT4_INODES_PER_GROUP(sb) - ino);
diff -puN fs/ext4/super.c~ext4-uninitialized-block-groups-fix fs/ext4/super.c
--- a/fs/ext4/super.c~ext4-uninitialized-block-groups-fix
+++ a/fs/ext4/super.c
@@ -37,6 +37,7 @@
#include
#include
#include
+#include
#include
@@ -1337,56 +1338,6 @@ static int ext4_setup_super(struct super
return res;
}
-#if !defined(CONFIG_CRC16)
-/** CRC table for the CRC-16. The poly is 0x8005 (x16 + x15 + x2 + 1) */
-__u16 const crc16_table[256] = {
- 0x, 0xC0C1, 0xC181, 0x0140, 0xC301, 0x03C0, 0x0280, 0xC241,
- 0xC601, 0x06C0, 0x0780, 0xC741, 0x0500, 0xC5C1, 0xC481, 0x0440,
- 0xCC01, 0x0CC0, 0x0D80, 0xCD41, 0x0F00, 0xCFC1, 0xCE81, 0x0E40,
- 0x0A00, 0xCAC1, 0xCB81, 0x0B40, 0xC901, 0x09C0, 0x0880, 0xC841,
- 0xD801, 0x18C0, 0x1980, 0xD941, 0x1B00, 0xDBC1, 0xDA81, 0x1A40,
- 0x1E00, 0xDEC1, 0xDF81, 0x1F40, 0xDD01, 0x1DC0, 0x1C80, 0xDC41,
- 0x1400, 0xD4C1, 0xD581, 0x1540, 0xD701, 0x17C0, 0x1680, 0xD641,
- 0xD201, 0x12C0, 0x1380, 0xD341, 0x1100, 0xD1C1, 0xD081, 0x1040,
- 0xF001, 0x30C0, 0x3180, 0xF141, 0x3300, 0xF3C1, 0xF281, 0x3240,
- 0x3600, 0xF6C1, 0xF781, 0x3740, 0xF501, 0x35C0, 0x3480, 0xF441,
- 0x3C00, 0xFCC1, 0xFD81, 0x3D40, 0xFF01, 0x3FC0, 0x3E80, 0xFE41,
- 0xFA01, 0x3AC0, 0x3B80, 0xFB41, 0x3900, 0xF9C1, 0xF881, 0x3840,
- 0x2800, 0xE8C1, 0xE981, 0x2940, 0xEB01, 0x2BC0, 0x2A80, 0xEA41,
- 0xEE01, 0x2EC0, 0x2F80, 0xEF41, 0x2D00, 0xEDC1, 0xEC81, 0x2C40,
- 0xE401, 0x24C0, 0x2580, 0xE541, 0x2700, 0xE7C1, 0xE681, 0x2640,
- 0x2200, 0xE2C1, 0xE381, 0x2340, 0xE101, 0x21C0, 0x2080, 0xE041,
- 0xA001, 0x60C0, 0x6180, 0xA141, 0x6300, 0xA3C1, 0xA281, 0x6240,
- 0x660
+ ext4-uninitialized-block-groups-fix.patch added to -mm tree
The patch titled
Ext4: Uninitialized Block Groups (fix)
has been added to the -mm tree. Its filename is
ext4-uninitialized-block-groups-fix.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
--
Subject: Ext4: Uninitialized Block Groups (fix)
From: Avantika Mathur <[EMAIL PROTECTED]>
Andreas Dilger wrote:
> On Sep 18, 2007 20:03 -0700, Andrew Morton wrote:
>
>> On Tue, 18 Sep 2007 17:25:31 -0700 Avantika Mathur <[EMAIL PROTECTED]> wrote:
>>
>>
>>> +#if !defined(CONFIG_CRC16)
>>> +/** CRC table for the CRC-16. The poly is 0x8005 (x16 + x15 + x2 + 1) */
>>> +__u16 const crc16_table[256] = { me
>>> + 0x, 0xC0C1, 0xC181, 0x0140, 0xC301, 0x03C0, 0x0280, 0xC241,
>>>
>> That's rather sad. A plain old "depends on" would be better.
>>
>
> My bad. We wrote this patch and it had to run on older kernels that might
> not even have lib/crc16.c (it was added around 2.6.15 or so, so e.g. RHEL4
> doesn't have it). I forgot to remove it from the upstream submission,
> and since it didn't cause problems nobody else complained...
The incremental patch below removes the local crc16 code, and also resolves an
issue with properly updating bg_itable_unused when an inode is allocated in an
unused block groups.
Cc: Andreas Dilger <[EMAIL PROTECTED]>
Cc: Avantika Mathur <[EMAIL PROTECTED]>
Cc: Mingming Cao <[EMAIL PROTECTED]>
Cc: Aneesh Kumar K.V <[EMAIL PROTECTED]>
Cc:
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
---
fs/Kconfig |1
fs/ext4/ialloc.c |8 ++-
fs/ext4/super.c | 51 -
3 files changed, 9 insertions(+), 51 deletions(-)
diff -puN fs/ext4/ialloc.c~ext4-uninitialized-block-groups-fix fs/ext4/ialloc.c
--- a/fs/ext4/ialloc.c~ext4-uninitialized-block-groups-fix
+++ a/fs/ext4/ialloc.c
@@ -632,12 +632,18 @@ got:
if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_GDT_CSUM)) {
if (gdp->bg_flags & cpu_to_le16(EXT4_BG_INODE_UNINIT)) {
gdp->bg_flags &= cpu_to_le16(~EXT4_BG_INODE_UNINIT);
- free = EXT4_INODES_PER_GROUP(sb);
+ free = 0;
} else {
free = EXT4_INODES_PER_GROUP(sb) -
le16_to_cpu(gdp->bg_itable_unused);
}
+ /*
+* Check the relative inode number against the last used
+* relative inode number in this group. if it is greater
+* we need to update the bg_itable_unused count
+*
+*/
if (ino > free)
gdp->bg_itable_unused =
cpu_to_le16(EXT4_INODES_PER_GROUP(sb) - ino);
diff -puN fs/ext4/super.c~ext4-uninitialized-block-groups-fix fs/ext4/super.c
--- a/fs/ext4/super.c~ext4-uninitialized-block-groups-fix
+++ a/fs/ext4/super.c
@@ -37,6 +37,7 @@
#include
#include
#include
+#include
#include
@@ -1337,56 +1338,6 @@ static int ext4_setup_super(struct super
return res;
}
-#if !defined(CONFIG_CRC16)
-/** CRC table for the CRC-16. The poly is 0x8005 (x16 + x15 + x2 + 1) */
-__u16 const crc16_table[256] = {
- 0x, 0xC0C1, 0xC181, 0x0140, 0xC301, 0x03C0, 0x0280, 0xC241,
- 0xC601, 0x06C0, 0x0780, 0xC741, 0x0500, 0xC5C1, 0xC481, 0x0440,
- 0xCC01, 0x0CC0, 0x0D80, 0xCD41, 0x0F00, 0xCFC1, 0xCE81, 0x0E40,
- 0x0A00, 0xCAC1, 0xCB81, 0x0B40, 0xC901, 0x09C0, 0x0880, 0xC841,
- 0xD801, 0x18C0, 0x1980, 0xD941, 0x1B00, 0xDBC1, 0xDA81, 0x1A40,
- 0x1E00, 0xDEC1, 0xDF81, 0x1F40, 0xDD01, 0x1DC0, 0x1C80, 0xDC41,
- 0x1400, 0xD4C1, 0xD581, 0x1540, 0xD701, 0x17C0, 0x1680, 0xD641,
- 0xD201, 0x12C0, 0x1380, 0xD341, 0x1100, 0xD1C1, 0xD081, 0x1040,
- 0xF001, 0x30C0, 0x3180, 0xF141, 0x3300, 0xF3C1, 0xF281, 0x3240,
- 0x3600, 0xF6C1, 0xF781, 0x3740, 0xF501, 0x35C0, 0x3480, 0xF441,
- 0x3C00, 0xFCC1, 0xFD81, 0x3D40, 0xFF01, 0x3FC0, 0x3E80, 0xFE41,
- 0xFA01, 0x3AC0, 0x3B80, 0xFB41, 0x3900, 0xF9C1, 0xF881, 0x3840,
- 0x2800, 0xE8C1, 0xE981, 0x2940, 0xEB01, 0x2BC0, 0x2A80, 0xEA41,
- 0xEE01, 0x2EC0, 0x2F80, 0xEF41, 0x2D00, 0xEDC1, 0xEC81, 0x2C40,
- 0xE401, 0x24C0, 0x2580, 0xE541, 0x2700, 0xE7C1, 0xE681, 0x2640,
- 0x2200, 0xE2C1, 0xE381, 0x2340, 0xE101, 0x21C0, 0x2080, 0xE041,
- 0xA001, 0x60C0, 0x6180, 0xA141, 0x6300, 0xA3C1, 0xA281, 0x6240,
- 0x6600, 0xA6C1, 0xA781, 0x6740, 0xA501, 0x65C0, 0x6480, 0xA441,
- 0x6C00, 0xACC1, 0xAD81, 0x6D40, 0xAF01, 0x6FC0, 0x6E80, 0xAE41,
- 0xAA01, 0x6AC0, 0x6B80, 0xAB41, 0x6900, 0xA9C1, 0xA881, 0x6840,
- 0x7800, 0xB8C1, 0xB981, 0x7940, 0xBB01, 0x7BC0, 0x7A80, 0xBA41,
- 0xBE01, 0x7EC0, 0x7F80, 0xBF41, 0x7D00, 0xBDC1, 0xBC81, 0x7C40,
- 0xB401, 0x74C0, 0x7580,
