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* [PATCH] chattr/lsattr: Support dax attribute
@ 2020-07-27  9:29 Xiao Yang
  2020-07-27 15:37 ` Eric Biggers
  2020-07-27 16:08 ` Darrick J. Wong
  0 siblings, 2 replies; 5+ messages in thread
From: Xiao Yang @ 2020-07-27  9:29 UTC (permalink / raw)
  To: darrick.wong, ira.weiny, tytso; +Cc: linux-ext4, Xiao Yang

Use the letter 'x' to set/get dax attribute on a directory/file.

Signed-off-by: Xiao Yang <yangx.jy@cn.fujitsu.com>
---
 lib/e2p/pf.c         |  1 +
 lib/ext2fs/ext2_fs.h |  1 +
 misc/chattr.1.in     | 10 ++++++++--
 misc/chattr.c        |  3 ++-
 4 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/lib/e2p/pf.c b/lib/e2p/pf.c
index 0c6998c4..e59cccff 100644
--- a/lib/e2p/pf.c
+++ b/lib/e2p/pf.c
@@ -44,6 +44,7 @@ static struct flags_name flags_array[] = {
 	{ EXT2_TOPDIR_FL, "T", "Top_of_Directory_Hierarchies" },
 	{ EXT4_EXTENTS_FL, "e", "Extents" },
 	{ FS_NOCOW_FL, "C", "No_COW" },
+	{ FS_DAX_FL, "x", "Dax" },
 	{ EXT4_CASEFOLD_FL, "F", "Casefold" },
 	{ EXT4_INLINE_DATA_FL, "N", "Inline_Data" },
 	{ EXT4_PROJINHERIT_FL, "P", "Project_Hierarchy" },
diff --git a/lib/ext2fs/ext2_fs.h b/lib/ext2fs/ext2_fs.h
index 6c20ea77..b5e2e42a 100644
--- a/lib/ext2fs/ext2_fs.h
+++ b/lib/ext2fs/ext2_fs.h
@@ -334,6 +334,7 @@ struct ext2_dx_tail {
 #define EXT4_EA_INODE_FL	        0x00200000 /* Inode used for large EA */
 /* EXT4_EOFBLOCKS_FL 0x00400000 was here */
 #define FS_NOCOW_FL			0x00800000 /* Do not cow file */
+#define FS_DAX_FL			0x02000000 /* Inode is DAX */
 #define EXT4_SNAPFILE_FL		0x01000000  /* Inode is a snapshot */
 #define EXT4_SNAPFILE_DELETED_FL	0x04000000  /* Snapshot is being deleted */
 #define EXT4_SNAPFILE_SHRUNK_FL		0x08000000  /* Snapshot shrink has completed */
diff --git a/misc/chattr.1.in b/misc/chattr.1.in
index ff2fcf00..b27c8e1f 100644
--- a/misc/chattr.1.in
+++ b/misc/chattr.1.in
@@ -23,7 +23,7 @@ chattr \- change file attributes on a Linux file system
 .B chattr
 changes the file attributes on a Linux file system.
 .PP
-The format of a symbolic mode is +-=[aAcCdDeFijPsStTu].
+The format of a symbolic mode is +-=[aAcCdDeFijPsStTux].
 .PP
 The operator '+' causes the selected attributes to be added to the
 existing attributes of the files; '-' causes them to be removed; and '='
@@ -45,7 +45,8 @@ secure deletion (s),
 synchronous updates (S),
 no tail-merging (t),
 top of directory hierarchy (T),
-and undeletable (u).
+undeletable (u),
+and direct access for files (x).
 .PP
 The following attributes are read-only, and may be listed by
 .BR lsattr (1)
@@ -210,6 +211,11 @@ saved.  This allows the user to ask for its undeletion.  Note: please
 make sure to read the bugs and limitations section at the end of this
 document.
 .TP
+.B x
+A file with the 'x' attribute set is accessed directly on the memory-like
+disk(e.g. /dev/pmem) by the kernel.  Kernel will skip page cache and do
+reads/writes on the file directly.
+.TP
 .B V
 A file with the 'V' attribute set has fs-verity enabled.  It cannot be
 written to, and the filesystem will automatically verify all data read
diff --git a/misc/chattr.c b/misc/chattr.c
index a5d60170..c0337f86 100644
--- a/misc/chattr.c
+++ b/misc/chattr.c
@@ -86,7 +86,7 @@ static unsigned long sf;
 static void usage(void)
 {
 	fprintf(stderr,
-		_("Usage: %s [-pRVf] [-+=aAcCdDeijPsStTuF] [-v version] files...\n"),
+		_("Usage: %s [-pRVf] [-+=aAcCdDeijPsStTuFx] [-v version] files...\n"),
 		program_name);
 	exit(1);
 }
@@ -112,6 +112,7 @@ static const struct flags_char flags_array[] = {
 	{ EXT2_NOTAIL_FL, 't' },
 	{ EXT2_TOPDIR_FL, 'T' },
 	{ FS_NOCOW_FL, 'C' },
+	{ FS_DAX_FL, 'x' },
 	{ EXT4_CASEFOLD_FL, 'F' },
 	{ 0, 0 }
 };
-- 
2.21.0




^ permalink raw reply	[flat|nested] 5+ messages in thread

* Re: [PATCH] chattr/lsattr: Support dax attribute
  2020-07-27  9:29 [PATCH] chattr/lsattr: Support dax attribute Xiao Yang
@ 2020-07-27 15:37 ` Eric Biggers
  2020-07-28  1:08   ` Xiao Yang
  2020-07-27 16:08 ` Darrick J. Wong
  1 sibling, 1 reply; 5+ messages in thread
From: Eric Biggers @ 2020-07-27 15:37 UTC (permalink / raw)
  To: Xiao Yang; +Cc: darrick.wong, ira.weiny, tytso, linux-ext4

On Mon, Jul 27, 2020 at 05:29:01PM +0800, Xiao Yang wrote:
> Use the letter 'x' to set/get dax attribute on a directory/file.
> 
> Signed-off-by: Xiao Yang <yangx.jy@cn.fujitsu.com>
> ---
>  lib/e2p/pf.c         |  1 +
>  lib/ext2fs/ext2_fs.h |  1 +
>  misc/chattr.1.in     | 10 ++++++++--
>  misc/chattr.c        |  3 ++-
>  4 files changed, 12 insertions(+), 3 deletions(-)
> 
> diff --git a/lib/e2p/pf.c b/lib/e2p/pf.c
> index 0c6998c4..e59cccff 100644
> --- a/lib/e2p/pf.c
> +++ b/lib/e2p/pf.c
> @@ -44,6 +44,7 @@ static struct flags_name flags_array[] = {
>  	{ EXT2_TOPDIR_FL, "T", "Top_of_Directory_Hierarchies" },
>  	{ EXT4_EXTENTS_FL, "e", "Extents" },
>  	{ FS_NOCOW_FL, "C", "No_COW" },
> +	{ FS_DAX_FL, "x", "Dax" },
>  	{ EXT4_CASEFOLD_FL, "F", "Casefold" },
>  	{ EXT4_INLINE_DATA_FL, "N", "Inline_Data" },
>  	{ EXT4_PROJINHERIT_FL, "P", "Project_Hierarchy" },
> diff --git a/lib/ext2fs/ext2_fs.h b/lib/ext2fs/ext2_fs.h
> index 6c20ea77..b5e2e42a 100644
> --- a/lib/ext2fs/ext2_fs.h
> +++ b/lib/ext2fs/ext2_fs.h
> @@ -334,6 +334,7 @@ struct ext2_dx_tail {
>  #define EXT4_EA_INODE_FL	        0x00200000 /* Inode used for large EA */
>  /* EXT4_EOFBLOCKS_FL 0x00400000 was here */
>  #define FS_NOCOW_FL			0x00800000 /* Do not cow file */
> +#define FS_DAX_FL			0x02000000 /* Inode is DAX */
>  #define EXT4_SNAPFILE_FL		0x01000000  /* Inode is a snapshot */
>  #define EXT4_SNAPFILE_DELETED_FL	0x04000000  /* Snapshot is being deleted */
>  #define EXT4_SNAPFILE_SHRUNK_FL		0x08000000  /* Snapshot shrink has completed */

How about putting the values in order?

> diff --git a/misc/chattr.1.in b/misc/chattr.1.in
> index ff2fcf00..b27c8e1f 100644
> --- a/misc/chattr.1.in
> +++ b/misc/chattr.1.in
> @@ -23,7 +23,7 @@ chattr \- change file attributes on a Linux file system
>  .B chattr
>  changes the file attributes on a Linux file system.
>  .PP
> -The format of a symbolic mode is +-=[aAcCdDeFijPsStTu].
> +The format of a symbolic mode is +-=[aAcCdDeFijPsStTux].
>  .PP
>  The operator '+' causes the selected attributes to be added to the
>  existing attributes of the files; '-' causes them to be removed; and '='
> @@ -45,7 +45,8 @@ secure deletion (s),
>  synchronous updates (S),
>  no tail-merging (t),
>  top of directory hierarchy (T),
> -and undeletable (u).
> +undeletable (u),
> +and direct access for files (x).

There's another part that needs to be updated to add "x":

"The letters 'aAcCdDeFijPsStTu' select the new attributes for the files:"

^ permalink raw reply	[flat|nested] 5+ messages in thread

* Re: [PATCH] chattr/lsattr: Support dax attribute
  2020-07-27  9:29 [PATCH] chattr/lsattr: Support dax attribute Xiao Yang
  2020-07-27 15:37 ` Eric Biggers
@ 2020-07-27 16:08 ` Darrick J. Wong
  2020-07-28  1:12   ` Xiao Yang
  1 sibling, 1 reply; 5+ messages in thread
From: Darrick J. Wong @ 2020-07-27 16:08 UTC (permalink / raw)
  To: Xiao Yang; +Cc: ira.weiny, tytso, linux-ext4

On Mon, Jul 27, 2020 at 05:29:01PM +0800, Xiao Yang wrote:
> Use the letter 'x' to set/get dax attribute on a directory/file.
> 
> Signed-off-by: Xiao Yang <yangx.jy@cn.fujitsu.com>
> ---
>  lib/e2p/pf.c         |  1 +
>  lib/ext2fs/ext2_fs.h |  1 +
>  misc/chattr.1.in     | 10 ++++++++--
>  misc/chattr.c        |  3 ++-
>  4 files changed, 12 insertions(+), 3 deletions(-)
> 
> diff --git a/lib/e2p/pf.c b/lib/e2p/pf.c
> index 0c6998c4..e59cccff 100644
> --- a/lib/e2p/pf.c
> +++ b/lib/e2p/pf.c
> @@ -44,6 +44,7 @@ static struct flags_name flags_array[] = {
>  	{ EXT2_TOPDIR_FL, "T", "Top_of_Directory_Hierarchies" },
>  	{ EXT4_EXTENTS_FL, "e", "Extents" },
>  	{ FS_NOCOW_FL, "C", "No_COW" },
> +	{ FS_DAX_FL, "x", "Dax" },
>  	{ EXT4_CASEFOLD_FL, "F", "Casefold" },
>  	{ EXT4_INLINE_DATA_FL, "N", "Inline_Data" },
>  	{ EXT4_PROJINHERIT_FL, "P", "Project_Hierarchy" },
> diff --git a/lib/ext2fs/ext2_fs.h b/lib/ext2fs/ext2_fs.h
> index 6c20ea77..b5e2e42a 100644
> --- a/lib/ext2fs/ext2_fs.h
> +++ b/lib/ext2fs/ext2_fs.h
> @@ -334,6 +334,7 @@ struct ext2_dx_tail {
>  #define EXT4_EA_INODE_FL	        0x00200000 /* Inode used for large EA */
>  /* EXT4_EOFBLOCKS_FL 0x00400000 was here */
>  #define FS_NOCOW_FL			0x00800000 /* Do not cow file */
> +#define FS_DAX_FL			0x02000000 /* Inode is DAX */
>  #define EXT4_SNAPFILE_FL		0x01000000  /* Inode is a snapshot */
>  #define EXT4_SNAPFILE_DELETED_FL	0x04000000  /* Snapshot is being deleted */
>  #define EXT4_SNAPFILE_SHRUNK_FL		0x08000000  /* Snapshot shrink has completed */
> diff --git a/misc/chattr.1.in b/misc/chattr.1.in
> index ff2fcf00..b27c8e1f 100644
> --- a/misc/chattr.1.in
> +++ b/misc/chattr.1.in
> @@ -23,7 +23,7 @@ chattr \- change file attributes on a Linux file system
>  .B chattr
>  changes the file attributes on a Linux file system.
>  .PP
> -The format of a symbolic mode is +-=[aAcCdDeFijPsStTu].
> +The format of a symbolic mode is +-=[aAcCdDeFijPsStTux].
>  .PP
>  The operator '+' causes the selected attributes to be added to the
>  existing attributes of the files; '-' causes them to be removed; and '='
> @@ -45,7 +45,8 @@ secure deletion (s),
>  synchronous updates (S),
>  no tail-merging (t),
>  top of directory hierarchy (T),
> -and undeletable (u).
> +undeletable (u),
> +and direct access for files (x).
>  .PP
>  The following attributes are read-only, and may be listed by
>  .BR lsattr (1)
> @@ -210,6 +211,11 @@ saved.  This allows the user to ask for its undeletion.  Note: please
>  make sure to read the bugs and limitations section at the end of this
>  document.
>  .TP
> +.B x
> +A file with the 'x' attribute set is accessed directly on the memory-like
> +disk(e.g. /dev/pmem) by the kernel.  Kernel will skip page cache and do
> +reads/writes on the file directly.

There's much more to FS_DAX_FL than that.

See the "Enabling DAX on XFS and ext4" section of
Documentation/filesystems/dax.txt.

Note the part where you can set it on directories too; and also the part
where there's a separate state for whether or not you get the pagecache
bypass.

--D

> +.TP
>  .B V
>  A file with the 'V' attribute set has fs-verity enabled.  It cannot be
>  written to, and the filesystem will automatically verify all data read
> diff --git a/misc/chattr.c b/misc/chattr.c
> index a5d60170..c0337f86 100644
> --- a/misc/chattr.c
> +++ b/misc/chattr.c
> @@ -86,7 +86,7 @@ static unsigned long sf;
>  static void usage(void)
>  {
>  	fprintf(stderr,
> -		_("Usage: %s [-pRVf] [-+=aAcCdDeijPsStTuF] [-v version] files...\n"),
> +		_("Usage: %s [-pRVf] [-+=aAcCdDeijPsStTuFx] [-v version] files...\n"),
>  		program_name);
>  	exit(1);
>  }
> @@ -112,6 +112,7 @@ static const struct flags_char flags_array[] = {
>  	{ EXT2_NOTAIL_FL, 't' },
>  	{ EXT2_TOPDIR_FL, 'T' },
>  	{ FS_NOCOW_FL, 'C' },
> +	{ FS_DAX_FL, 'x' },
>  	{ EXT4_CASEFOLD_FL, 'F' },
>  	{ 0, 0 }
>  };
> -- 
> 2.21.0
> 
> 
> 

^ permalink raw reply	[flat|nested] 5+ messages in thread

* Re: [PATCH] chattr/lsattr: Support dax attribute
  2020-07-27 15:37 ` Eric Biggers
@ 2020-07-28  1:08   ` Xiao Yang
  0 siblings, 0 replies; 5+ messages in thread
From: Xiao Yang @ 2020-07-28  1:08 UTC (permalink / raw)
  To: Eric Biggers; +Cc: darrick.wong, ira.weiny, tytso, linux-ext4

Hi Eric,

Thanks for your review.

On 2020/7/27 23:37, Eric Biggers wrote:
> On Mon, Jul 27, 2020 at 05:29:01PM +0800, Xiao Yang wrote:
>> Use the letter 'x' to set/get dax attribute on a directory/file.
>>
>> Signed-off-by: Xiao Yang<yangx.jy@cn.fujitsu.com>
>> ---
>>   lib/e2p/pf.c         |  1 +
>>   lib/ext2fs/ext2_fs.h |  1 +
>>   misc/chattr.1.in     | 10 ++++++++--
>>   misc/chattr.c        |  3 ++-
>>   4 files changed, 12 insertions(+), 3 deletions(-)
>>
>> diff --git a/lib/e2p/pf.c b/lib/e2p/pf.c
>> index 0c6998c4..e59cccff 100644
>> --- a/lib/e2p/pf.c
>> +++ b/lib/e2p/pf.c
>> @@ -44,6 +44,7 @@ static struct flags_name flags_array[] = {
>>   	{ EXT2_TOPDIR_FL, "T", "Top_of_Directory_Hierarchies" },
>>   	{ EXT4_EXTENTS_FL, "e", "Extents" },
>>   	{ FS_NOCOW_FL, "C", "No_COW" },
>> +	{ FS_DAX_FL, "x", "Dax" },
>>   	{ EXT4_CASEFOLD_FL, "F", "Casefold" },
>>   	{ EXT4_INLINE_DATA_FL, "N", "Inline_Data" },
>>   	{ EXT4_PROJINHERIT_FL, "P", "Project_Hierarchy" },
>> diff --git a/lib/ext2fs/ext2_fs.h b/lib/ext2fs/ext2_fs.h
>> index 6c20ea77..b5e2e42a 100644
>> --- a/lib/ext2fs/ext2_fs.h
>> +++ b/lib/ext2fs/ext2_fs.h
>> @@ -334,6 +334,7 @@ struct ext2_dx_tail {
>>   #define EXT4_EA_INODE_FL	        0x00200000 /* Inode used for large EA */
>>   /* EXT4_EOFBLOCKS_FL 0x00400000 was here */
>>   #define FS_NOCOW_FL			0x00800000 /* Do not cow file */
>> +#define FS_DAX_FL			0x02000000 /* Inode is DAX */
>>   #define EXT4_SNAPFILE_FL		0x01000000  /* Inode is a snapshot */
>>   #define EXT4_SNAPFILE_DELETED_FL	0x04000000  /* Snapshot is being deleted */
>>   #define EXT4_SNAPFILE_SHRUNK_FL		0x08000000  /* Snapshot shrink has completed */
> How about putting the values in order?

Sure, I will put the values in order.

>> diff --git a/misc/chattr.1.in b/misc/chattr.1.in
>> index ff2fcf00..b27c8e1f 100644
>> --- a/misc/chattr.1.in
>> +++ b/misc/chattr.1.in
>> @@ -23,7 +23,7 @@ chattr \- change file attributes on a Linux file system
>>   .B chattr
>>   changes the file attributes on a Linux file system.
>>   .PP
>> -The format of a symbolic mode is +-=[aAcCdDeFijPsStTu].
>> +The format of a symbolic mode is +-=[aAcCdDeFijPsStTux].
>>   .PP
>>   The operator '+' causes the selected attributes to be added to the
>>   existing attributes of the files; '-' causes them to be removed; and '='
>> @@ -45,7 +45,8 @@ secure deletion (s),
>>   synchronous updates (S),
>>   no tail-merging (t),
>>   top of directory hierarchy (T),
>> -and undeletable (u).
>> +undeletable (u),
>> +and direct access for files (x).
> There's another part that needs to be updated to add "x":
>
> "The letters 'aAcCdDeFijPsStTu' select the new attributes for the files:"
Good catch. :-)

Thanks,
Xiao Yang
>
> .
>




^ permalink raw reply	[flat|nested] 5+ messages in thread

* Re: [PATCH] chattr/lsattr: Support dax attribute
  2020-07-27 16:08 ` Darrick J. Wong
@ 2020-07-28  1:12   ` Xiao Yang
  0 siblings, 0 replies; 5+ messages in thread
From: Xiao Yang @ 2020-07-28  1:12 UTC (permalink / raw)
  To: Darrick J. Wong; +Cc: ira.weiny, tytso, linux-ext4

Hi Darrick,

Thanks for your review.

On 2020/7/28 0:08, Darrick J. Wong wrote:
> On Mon, Jul 27, 2020 at 05:29:01PM +0800, Xiao Yang wrote:
>> Use the letter 'x' to set/get dax attribute on a directory/file.
>>
>> Signed-off-by: Xiao Yang<yangx.jy@cn.fujitsu.com>
>> ---
>>   lib/e2p/pf.c         |  1 +
>>   lib/ext2fs/ext2_fs.h |  1 +
>>   misc/chattr.1.in     | 10 ++++++++--
>>   misc/chattr.c        |  3 ++-
>>   4 files changed, 12 insertions(+), 3 deletions(-)
>>
>> diff --git a/lib/e2p/pf.c b/lib/e2p/pf.c
>> index 0c6998c4..e59cccff 100644
>> --- a/lib/e2p/pf.c
>> +++ b/lib/e2p/pf.c
>> @@ -44,6 +44,7 @@ static struct flags_name flags_array[] = {
>>   	{ EXT2_TOPDIR_FL, "T", "Top_of_Directory_Hierarchies" },
>>   	{ EXT4_EXTENTS_FL, "e", "Extents" },
>>   	{ FS_NOCOW_FL, "C", "No_COW" },
>> +	{ FS_DAX_FL, "x", "Dax" },
>>   	{ EXT4_CASEFOLD_FL, "F", "Casefold" },
>>   	{ EXT4_INLINE_DATA_FL, "N", "Inline_Data" },
>>   	{ EXT4_PROJINHERIT_FL, "P", "Project_Hierarchy" },
>> diff --git a/lib/ext2fs/ext2_fs.h b/lib/ext2fs/ext2_fs.h
>> index 6c20ea77..b5e2e42a 100644
>> --- a/lib/ext2fs/ext2_fs.h
>> +++ b/lib/ext2fs/ext2_fs.h
>> @@ -334,6 +334,7 @@ struct ext2_dx_tail {
>>   #define EXT4_EA_INODE_FL	        0x00200000 /* Inode used for large EA */
>>   /* EXT4_EOFBLOCKS_FL 0x00400000 was here */
>>   #define FS_NOCOW_FL			0x00800000 /* Do not cow file */
>> +#define FS_DAX_FL			0x02000000 /* Inode is DAX */
>>   #define EXT4_SNAPFILE_FL		0x01000000  /* Inode is a snapshot */
>>   #define EXT4_SNAPFILE_DELETED_FL	0x04000000  /* Snapshot is being deleted */
>>   #define EXT4_SNAPFILE_SHRUNK_FL		0x08000000  /* Snapshot shrink has completed */
>> diff --git a/misc/chattr.1.in b/misc/chattr.1.in
>> index ff2fcf00..b27c8e1f 100644
>> --- a/misc/chattr.1.in
>> +++ b/misc/chattr.1.in
>> @@ -23,7 +23,7 @@ chattr \- change file attributes on a Linux file system
>>   .B chattr
>>   changes the file attributes on a Linux file system.
>>   .PP
>> -The format of a symbolic mode is +-=[aAcCdDeFijPsStTu].
>> +The format of a symbolic mode is +-=[aAcCdDeFijPsStTux].
>>   .PP
>>   The operator '+' causes the selected attributes to be added to the
>>   existing attributes of the files; '-' causes them to be removed; and '='
>> @@ -45,7 +45,8 @@ secure deletion (s),
>>   synchronous updates (S),
>>   no tail-merging (t),
>>   top of directory hierarchy (T),
>> -and undeletable (u).
>> +undeletable (u),
>> +and direct access for files (x).
>>   .PP
>>   The following attributes are read-only, and may be listed by
>>   .BR lsattr (1)
>> @@ -210,6 +211,11 @@ saved.  This allows the user to ask for its undeletion.  Note: please
>>   make sure to read the bugs and limitations section at the end of this
>>   document.
>>   .TP
>> +.B x
>> +A file with the 'x' attribute set is accessed directly on the memory-like
>> +disk(e.g. /dev/pmem) by the kernel.  Kernel will skip page cache and do
>> +reads/writes on the file directly.
> There's much more to FS_DAX_FL than that.

Agreed.   Sorry for the rough description.

> See the "Enabling DAX on XFS and ext4" section of
> Documentation/filesystems/dax.txt.
>
> Note the part where you can set it on directories too; and also the part
> where there's a separate state for whether or not you get the pagecache
> bypass.

I will try to add more detailed description in v2 patch.

Thanks,
Xiao Yang
> --D
>
>> +.TP
>>   .B V
>>   A file with the 'V' attribute set has fs-verity enabled.  It cannot be
>>   written to, and the filesystem will automatically verify all data read
>> diff --git a/misc/chattr.c b/misc/chattr.c
>> index a5d60170..c0337f86 100644
>> --- a/misc/chattr.c
>> +++ b/misc/chattr.c
>> @@ -86,7 +86,7 @@ static unsigned long sf;
>>   static void usage(void)
>>   {
>>   	fprintf(stderr,
>> -		_("Usage: %s [-pRVf] [-+=aAcCdDeijPsStTuF] [-v version] files...\n"),
>> +		_("Usage: %s [-pRVf] [-+=aAcCdDeijPsStTuFx] [-v version] files...\n"),
>>   		program_name);
>>   	exit(1);
>>   }
>> @@ -112,6 +112,7 @@ static const struct flags_char flags_array[] = {
>>   	{ EXT2_NOTAIL_FL, 't' },
>>   	{ EXT2_TOPDIR_FL, 'T' },
>>   	{ FS_NOCOW_FL, 'C' },
>> +	{ FS_DAX_FL, 'x' },
>>   	{ EXT4_CASEFOLD_FL, 'F' },
>>   	{ 0, 0 }
>>   };
>> -- 
>> 2.21.0
>>
>>
>>
>
> .
>




^ permalink raw reply	[flat|nested] 5+ messages in thread

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2020-07-27  9:29 [PATCH] chattr/lsattr: Support dax attribute Xiao Yang
2020-07-27 15:37 ` Eric Biggers
2020-07-28  1:08   ` Xiao Yang
2020-07-27 16:08 ` Darrick J. Wong
2020-07-28  1:12   ` Xiao Yang

Linux-ext4 Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-ext4/0 linux-ext4/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-ext4 linux-ext4/ https://lore.kernel.org/linux-ext4 \
		linux-ext4@vger.kernel.org
	public-inbox-index linux-ext4

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-ext4


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git