From mboxrd@z Thu Jan  1 00:00:00 1970
From: Michael Kerrisk <mtk.manpages@gmail.com>
Subject: Re: [PATCH] Add a pair of system calls to make extended file stats
	available [ver #3]
Date: Sun, 4 Jul 2010 06:33:10 +0200
Message-ID: <AANLkTilYME3LSiPi2gqqfEk9iaWJw3iRw3OXbnAZ2QBZ@mail.gmail.com>
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To: David Howells <dhowells@redhat.com>
Cc: linux-fsdevel@vger.kernel.org, linux-cifs@vger.kernel.org, linux-kernel@vger.kernel.org, samba-technical@lists.samba.org, linux-ext4@vger.kernel.org, linux-api@vger.kernel.org
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hi David,

On Fri, Jul 2, 2010 at 7:36 AM, Michael Kerrisk <mtk.manpages@gmail.com=
> wrote:
> Hi David,
>
> [Please CC linux-api@ on patches that change the API/ABI]
>
> On Thu, Jul 1, 2010 at 1:36 AM, David Howells <dhowells@redhat.com> w=
rote:
>> Add a pair of system calls to make extended file stats available, in=
cluding
>> file creation time, inode version and data version where available t=
hrough the
>> underlying filesystem.
>
> Just some random thoughts here. I've not tried to guess the overhead
> of these ideas...
>
> * Include information from the "inode_info" structure, most notably
> i_flags, but perhaps other info as well.

I see you put a patch for the above for comment. Thanks.

> * Return a bit mask indicating the presence of additional information
> associated with the i-node. Here, I am thinking of flags that indicat=
e
> that the file has any of the following: capabilities, an ACL, and
> extended attributes (obviously a superset of the previous). I could
> imagine some apps that, having got the xstat info, would be intereste=
d
> to obtain some of this other info.

What did you think about the above idea?

Cheers,

Michael


> Obviously, the above only make sense if the overhead of providing the
> extra information is low.
>
>> [This depends on the previously posted pair of patches to (a) consti=
fy a number
>> =A0of syscall string and buffer arguments and (b) rearrange AFS's us=
e of
>> =A0i_version and i_generation].
>>
>> The following structures are defined for their use:
>>
>> =A0 =A0 =A0 =A0struct xstat_parameters {
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0unsigned long long =A0 =A0 =A0request=
_mask;
>> =A0 =A0 =A0 =A0};
>>
>> =A0 =A0 =A0 =A0struct xstat_dev {
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0unsigned int =A0 =A0 =A0 =A0 =A0 =A0m=
ajor, minor;
>> =A0 =A0 =A0 =A0};
>>
>> =A0 =A0 =A0 =A0struct xstat_time {
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0unsigned long long =A0 =A0 =A0tv_sec,=
 tv_nsec;
>> =A0 =A0 =A0 =A0};
>>
>> =A0 =A0 =A0 =A0struct xstat {
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0unsigned int =A0 =A0 =A0 =A0 =A0 =A0s=
t_mode;
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0unsigned int =A0 =A0 =A0 =A0 =A0 =A0s=
t_nlink;
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0unsigned int =A0 =A0 =A0 =A0 =A0 =A0s=
t_uid;
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0unsigned int =A0 =A0 =A0 =A0 =A0 =A0s=
t_gid;
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0struct xstat_dev =A0 =A0 =A0 =A0st_rd=
ev;
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0struct xstat_dev =A0 =A0 =A0 =A0st_de=
v;
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0struct xstat_time =A0 =A0 =A0 st_atim=
e;
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0struct xstat_time =A0 =A0 =A0 st_mtim=
e;
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0struct xstat_time =A0 =A0 =A0 st_ctim=
e;
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0struct xstat_time =A0 =A0 =A0 st_btim=
e;
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0unsigned long long =A0 =A0 =A0st_ino;
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0unsigned long long =A0 =A0 =A0st_size=
;
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0unsigned long long =A0 =A0 =A0st_blks=
ize;
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0unsigned long long =A0 =A0 =A0st_bloc=
ks;
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0unsigned long long =A0 =A0 =A0st_gen;
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0unsigned long long =A0 =A0 =A0st_data=
_version;
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0unsigned long long =A0 =A0 =A0st_resu=
lt_mask;
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0unsigned long long =A0 =A0 =A0st_extr=
a_results[0];
>> =A0 =A0 =A0 =A0};
>>
>> where st_btime is the file creation time, st_gen is the inode genera=
tion
>> (i_generation), st_data_version is the data version number (i_versio=
n),
>> request_mask and st_result_mask are bitmasks of data desired/provide=
d and
>> st_extra_results[] is where as-yet undefined fields are appended.
>>
>> The defined bits in request_mask and st_result_mask are:
>>
>> =A0 =A0 =A0 =A0XSTAT_REQUEST_MODE =A0 =A0 =A0 =A0 =A0 =A0 =A0Want/go=
t st_mode
>> =A0 =A0 =A0 =A0XSTAT_REQUEST_NLINK =A0 =A0 =A0 =A0 =A0 =A0 Want/got =
st_nlink
>> =A0 =A0 =A0 =A0XSTAT_REQUEST_UID =A0 =A0 =A0 =A0 =A0 =A0 =A0 Want/go=
t st_uid
>> =A0 =A0 =A0 =A0XSTAT_REQUEST_GID =A0 =A0 =A0 =A0 =A0 =A0 =A0 Want/go=
t st_gid
>> =A0 =A0 =A0 =A0XSTAT_REQUEST_RDEV =A0 =A0 =A0 =A0 =A0 =A0 =A0Want/go=
t st_rdev
>> =A0 =A0 =A0 =A0XSTAT_REQUEST_ATIME =A0 =A0 =A0 =A0 =A0 =A0 Want/got =
st_atime
>> =A0 =A0 =A0 =A0XSTAT_REQUEST_MTIME =A0 =A0 =A0 =A0 =A0 =A0 Want/got =
st_mtime
>> =A0 =A0 =A0 =A0XSTAT_REQUEST_CTIME =A0 =A0 =A0 =A0 =A0 =A0 Want/got =
st_ctime
>> =A0 =A0 =A0 =A0XSTAT_REQUEST_INO =A0 =A0 =A0 =A0 =A0 =A0 =A0 Want/go=
t st_ino
>> =A0 =A0 =A0 =A0XSTAT_REQUEST_SIZE =A0 =A0 =A0 =A0 =A0 =A0 =A0Want/go=
t st_size
>> =A0 =A0 =A0 =A0XSTAT_REQUEST_BLOCKS =A0 =A0 =A0 =A0 =A0 =A0Want/got =
st_blocks
>> =A0 =A0 =A0 =A0XSTAT_REQUEST__BASIC_STATS =A0 =A0 =A0The stuff in th=
e normal stat struct
>> =A0 =A0 =A0 =A0XSTAT_REQUEST_BTIME =A0 =A0 =A0 =A0 =A0 =A0 Want/got =
st_btime
>> =A0 =A0 =A0 =A0XSTAT_REQUEST_GEN =A0 =A0 =A0 =A0 =A0 =A0 =A0 Want/go=
t st_gen
>> =A0 =A0 =A0 =A0XSTAT_REQUEST_DATA_VERSION =A0 =A0 =A0Want/got st_dat=
a_version
>> =A0 =A0 =A0 =A0XSTAT_REQUEST__EXTENDED_STATS =A0 The stuff in the xs=
tat struct
>> =A0 =A0 =A0 =A0XSTAT_REQUEST__ALL_STATS =A0 =A0 =A0 =A0The defined s=
et of requestables
>>
>> The system calls are:
>>
>> =A0 =A0 =A0 =A0ssize_t ret =3D xstat(int dfd,
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0const char *f=
ilename,
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0unsigned flag=
s,
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0const struct =
xstat_parameters *params,
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0struct xstat =
*buffer,
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0size_t buflen=
);
>>
>> =A0 =A0 =A0 =A0ssize_t ret =3D fxstat(unsigned fd,
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 unsigned fla=
gs,
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 const struct=
 xstat_parameters *params,
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 struct xstat=
 *buffer,
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 size_t bufle=
n);
>>
>>
>> The dfd, filename, flags and fd parameters indicate the file to quer=
y. =A0There
>> is no equivalent of lstat() as that can be emulated with xstat() by =
passing
>> AT_SYMLINK_NOFOLLOW in flags.
>>
>> AT_FORCE_ATTR_SYNC can also be set in flags. =A0This will require a =
network
>> filesystem to synchronise its attributes with the server.
>>
>> When the system call is executed, the request_mask bitmask is read f=
rom the
>> parameter block to work out what the user is requesting. =A0If param=
s is NULL,
>> then request_mask will be assumed to be XSTAT_REQUEST__GET_ANYWAY.
>>
>> The request_mask should be set by the caller to specify extra result=
s that the
>> caller may desire. =A0These come in a number of classes:
>>
>> =A0(0) dev, blksize.
>>
>> =A0 =A0 These are local data and are always available.
>>
>> =A0(1) mode, nlinks, uid, gid, [amc]time, ino, size, blocks.
>>
>> =A0 =A0 These will be returned whether the caller asks for them or n=
ot. =A0The
>> =A0 =A0 corresponding bits in result_mask will be set to indicate th=
eir presence.
>>
>> =A0 =A0 If the caller didn't ask for them, then they may be approxim=
ated. =A0For
>> =A0 =A0 example, NFS won't waste any time updating them from the ser=
ver, unless as
>> =A0 =A0 a byproduct of updating something requested.
>>
>> =A0(2) rdev.
>>
>> =A0 =A0 As for class (1), but this won't be returned if the file is =
not a blockdev
>> =A0 =A0 or chardev. =A0The bit will be cleared if the value is not r=
eturned.
>>
>> =A0(3) File creation time, inode generation and data version.
>>
>> =A0 =A0 These will be returned if available whether the caller asked=
 for them or
>> =A0 =A0 not. =A0The corresponding bits in result_mask will be set or=
 cleared as
>> =A0 =A0 appropriate to indicate their presence.
>>
>> =A0 =A0 If the caller didn't ask for them, then they may be approxim=
ated. =A0For
>> =A0 =A0 example, NFS won't waste any time updating them from the ser=
ver, unless
>> =A0 =A0 as a byproduct of updating something requested.
>>
>> =A0(4) Extra results.
>>
>> =A0 =A0 These will only be returned if the caller asked for them by =
setting their
>> =A0 =A0 bits in request_mask. =A0They will be placed in the buffer a=
fter the xstat
>> =A0 =A0 struct in ascending result_mask bit order. =A0Any bit set in=
 request_mask
>> =A0 =A0 mask will be left set in result_mask if the result is availa=
ble and
>> =A0 =A0 cleared otherwise.
>>
>> =A0 =A0 The pointer into the results list will be rounded up to the =
nearest 8-byte
>> =A0 =A0 boundary after each result is written in. =A0The size of eac=
h extra result
>> =A0 =A0 is specific to the definition for that result.
>>
>> =A0 =A0 No extra results are currently defined.
>>
>> If the buffer is insufficiently big, the syscall returns the amount =
of space it
>> will need to write the complete result set and returns a partial res=
ult in the
>> buffer.
>>
>> At the moment, this will only work on x86_64 as it requires system c=
alls to be
>> wired up.
>>
>>
>> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>> FILESYSTEMS
>> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>>
>> The following filesystems have been modified to make use of this fac=
ility:
>>
>> =A0(*) Ext4. =A0This will return the creation time and inode version=
 number for all
>> =A0 =A0 files. =A0It will, however, only return the data version num=
ber for
>> =A0 =A0 directories unless the I_VERSION option is set on the filesy=
stem.
>>
>> =A0(*) AFS. =A0This will return the vnode ID uniquifier as the inode=
 version and
>> =A0 =A0 the AFS data version number as the data version. =A0There is=
 no file
>> =A0 =A0 creation time available.
>>
>> =A0 =A0 AFS should go to the server if AT_FORCE_ATTR_SYNC is specifi=
ed.
>>
>> =A0(*) NFS. =A0This will return the change attribute if NFSv4 only. =
=A0No other extra
>> =A0 =A0 values are returned at this time.
>>
>> =A0 =A0 If AT_FORCE_ATTR_SYNC is set or mtime, ctime or data_version=
 (NFSv4 only)
>> =A0 =A0 are asked for then the outstanding writes will be written to=
 the server
>> =A0 =A0 first.
>>
>> =A0 =A0 If AT_FORCE_ATTR_SYNC is set or atime is requested then the =
attributes
>> =A0 =A0 will be reread unconditionally, otherwise if any of data ver=
sion (NFSv4
>> =A0 =A0 only) XSTAT_REQUEST__BASIC_STATS are requested, then the att=
ributes will
>> =A0 =A0 be reread if the cached attributes have expired.
>>
>>
>> =3D=3D=3D=3D=3D=3D=3D
>> TESTING
>> =3D=3D=3D=3D=3D=3D=3D
>>
>> The following test program can be used to test the xstat system call=
:
>>
>> =A0 =A0 =A0 =A0#define _GNU_SOURCE
>> =A0 =A0 =A0 =A0#define _ATFILE_SOURCE
>> =A0 =A0 =A0 =A0#include <stdio.h>
>> =A0 =A0 =A0 =A0#include <stdlib.h>
>> =A0 =A0 =A0 =A0#include <string.h>
>> =A0 =A0 =A0 =A0#include <unistd.h>
>> =A0 =A0 =A0 =A0#include <fcntl.h>
>> =A0 =A0 =A0 =A0#include <time.h>
>> =A0 =A0 =A0 =A0#include <sys/syscall.h>
>> =A0 =A0 =A0 =A0#include <sys/stat.h>
>> =A0 =A0 =A0 =A0#include <sys/types.h>
>>
>> =A0 =A0 =A0 =A0#define AT_FORCE_ATTR_SYNC =A0 =A0 =A00x800
>>
>> =A0 =A0 =A0 =A0struct xstat_parameters {
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0unsigned long long =A0 =A0 =A0request=
_mask;
>> =A0 =A0 =A0 =A0#define XSTAT_REQUEST_MODE =A0 =A0 =A0 =A0 =A0 =A0 =A0=
0x00000001ULL
>> =A0 =A0 =A0 =A0#define XSTAT_REQUEST_NLINK =A0 =A0 =A0 =A0 =A0 =A0 0=
x00000002ULL
>> =A0 =A0 =A0 =A0#define XSTAT_REQUEST_UID =A0 =A0 =A0 =A0 =A0 =A0 =A0=
 0x00000004ULL
>> =A0 =A0 =A0 =A0#define XSTAT_REQUEST_GID =A0 =A0 =A0 =A0 =A0 =A0 =A0=
 0x00000008ULL
>> =A0 =A0 =A0 =A0#define XSTAT_REQUEST_RDEV =A0 =A0 =A0 =A0 =A0 =A0 =A0=
0x00000010ULL
>> =A0 =A0 =A0 =A0#define XSTAT_REQUEST_ATIME =A0 =A0 =A0 =A0 =A0 =A0 0=
x00000020ULL
>> =A0 =A0 =A0 =A0#define XSTAT_REQUEST_MTIME =A0 =A0 =A0 =A0 =A0 =A0 0=
x00000040ULL
>> =A0 =A0 =A0 =A0#define XSTAT_REQUEST_CTIME =A0 =A0 =A0 =A0 =A0 =A0 0=
x00000080ULL
>> =A0 =A0 =A0 =A0#define XSTAT_REQUEST_INO =A0 =A0 =A0 =A0 =A0 =A0 =A0=
 0x00000100ULL
>> =A0 =A0 =A0 =A0#define XSTAT_REQUEST_SIZE =A0 =A0 =A0 =A0 =A0 =A0 =A0=
0x00000200ULL
>> =A0 =A0 =A0 =A0#define XSTAT_REQUEST_BLOCKS =A0 =A0 =A0 =A0 =A0 =A00=
x00000400ULL
>> =A0 =A0 =A0 =A0#define XSTAT_REQUEST__BASIC_STATS =A0 =A0 =A00x00000=
7ffULL
>> =A0 =A0 =A0 =A0#define XSTAT_REQUEST_BTIME =A0 =A0 =A0 =A0 =A0 =A0 0=
x00000800ULL
>> =A0 =A0 =A0 =A0#define XSTAT_REQUEST_GEN =A0 =A0 =A0 =A0 =A0 =A0 =A0=
 0x00001000ULL
>> =A0 =A0 =A0 =A0#define XSTAT_REQUEST_DATA_VERSION =A0 =A0 =A00x00002=
000ULL
>> =A0 =A0 =A0 =A0#define XSTAT_REQUEST__EXTENDED_STATS =A0 0x00003fffU=
LL
>> =A0 =A0 =A0 =A0#define XSTAT_REQUEST__ALL_STATS =A0 =A0 =A0 =A00x000=
03fffULL
>> =A0 =A0 =A0 =A0};
>>
>> =A0 =A0 =A0 =A0struct xstat_dev {
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0unsigned int =A0 =A0major;
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0unsigned int =A0 =A0minor;
>> =A0 =A0 =A0 =A0};
>>
>> =A0 =A0 =A0 =A0struct xstat_time {
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0unsigned long long =A0 =A0 =A0tv_sec;
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0unsigned long long =A0 =A0 =A0tv_nsec=
;
>> =A0 =A0 =A0 =A0};
>>
>> =A0 =A0 =A0 =A0struct xstat {
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0unsigned int =A0 =A0 =A0 =A0 =A0 =A0s=
t_mode;
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0unsigned int =A0 =A0 =A0 =A0 =A0 =A0s=
t_nlink;
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0unsigned int =A0 =A0 =A0 =A0 =A0 =A0s=
t_uid;
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0unsigned int =A0 =A0 =A0 =A0 =A0 =A0s=
t_gid;
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0struct xstat_dev =A0 =A0 =A0 =A0st_rd=
ev;
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0struct xstat_dev =A0 =A0 =A0 =A0st_de=
v;
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0struct xstat_time =A0 =A0 =A0 st_atim=
;
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0struct xstat_time =A0 =A0 =A0 st_mtim=
;
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0struct xstat_time =A0 =A0 =A0 st_ctim=
;
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0struct xstat_time =A0 =A0 =A0 st_btim=
;
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0unsigned long long =A0 =A0 =A0st_ino;
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0unsigned long long =A0 =A0 =A0st_size=
;
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0unsigned long long =A0 =A0 =A0st_blks=
ize;
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0unsigned long long =A0 =A0 =A0st_bloc=
ks;
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0unsigned long long =A0 =A0 =A0st_gen;
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0unsigned long long =A0 =A0 =A0st_data=
_version;
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0unsigned long long =A0 =A0 =A0st_resu=
lt_mask;
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0unsigned long long =A0 =A0 =A0st_extr=
a_results[0];
>> =A0 =A0 =A0 =A0};
>>
>> =A0 =A0 =A0 =A0#define __NR_xstat =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0=
 =A0 =A0 =A0 =A0 =A0 =A0300
>> =A0 =A0 =A0 =A0#define __NR_fxstat =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0=
 =A0 =A0 =A0 =A0 =A0 301
>>
>> =A0 =A0 =A0 =A0static __attribute__((unused))
>> =A0 =A0 =A0 =A0ssize_t xstat(int dfd, const char *filename, unsigned=
 flags,
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0struct xstat_parameters *=
params,
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0struct xstat *buffer, siz=
e_t bufsize)
>> =A0 =A0 =A0 =A0{
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0return syscall(__NR_xstat, dfd, filen=
ame, flags,
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 params, =
buffer, bufsize);
>> =A0 =A0 =A0 =A0}
>>
>> =A0 =A0 =A0 =A0static __attribute__((unused))
>> =A0 =A0 =A0 =A0ssize_t fxstat(int fd, unsigned flags,
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 struct xstat_parameters =
*params,
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 struct xstat *buffer, si=
ze_t bufsize)
>> =A0 =A0 =A0 =A0{
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0return syscall(__NR_fxstat, fd, flags=
,
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 params, =
buffer, bufsize);
>> =A0 =A0 =A0 =A0}
>>
>> =A0 =A0 =A0 =A0static void print_time(const char *field, const struc=
t xstat_time *xstm)
>> =A0 =A0 =A0 =A0{
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0struct tm tm;
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0time_t tim;
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0char buffer[100];
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0int len;
>>
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0tim =3D xstm->tv_sec;
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0if (!localtime_r(&tim, &tm)) {
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0perror("localtime_r")=
;
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0exit(1);
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0}
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0len =3D strftime(buffer, 100, "%F %T"=
, &tm);
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0if (len =3D=3D 0) {
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0perror("strftime");
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0exit(1);
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0}
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0printf("%s", field);
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0fwrite(buffer, 1, len, stdout);
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0printf(".%09llu", xstm->tv_nsec);
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0len =3D strftime(buffer, 100, "%z", &=
tm);
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0if (len =3D=3D 0) {
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0perror("strftime2");
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0exit(1);
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0}
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0fwrite(buffer, 1, len, stdout);
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0printf("\n");
>> =A0 =A0 =A0 =A0}
>>
>> =A0 =A0 =A0 =A0static void dump_xstat(struct xstat *xst)
>> =A0 =A0 =A0 =A0{
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0char buffer[256], ft;
>>
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0printf("results=3D%llx\n", xst->st_re=
sult_mask);
>>
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0printf(" ");
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0if (xst->st_result_mask & XSTAT_REQUE=
ST_SIZE)
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0printf(" Size: %-15ll=
u", xst->st_size);
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0if (xst->st_result_mask & XSTAT_REQUE=
ST_BLOCKS)
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0printf(" Blocks: %-10=
llu", xst->st_blocks);
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0printf(" IO Block: %-6llu ", xst->st_=
blksize);
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0if (xst->st_result_mask & XSTAT_REQUE=
ST_MODE) {
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0switch (xst->st_mode =
& S_IFMT) {
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0case S_IFIFO: =A0 pri=
ntf(" FIFO\n"); =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0ft =3D 'p'; =
break;
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0case S_IFCHR: =A0 pri=
ntf(" character special file\n"); =A0 =A0ft =3D 'c'; break;
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0case S_IFDIR: =A0 pri=
ntf(" directory\n"); =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 ft =3D 'd'; break;
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0case S_IFBLK: =A0 pri=
ntf(" block special file\n"); =A0 =A0 =A0 =A0ft =3D 'b'; break;
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0case S_IFREG: =A0 pri=
ntf(" regular file\n"); =A0 =A0 =A0 =A0 =A0 =A0 =A0ft =3D '-'; break;
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0case S_IFLNK: =A0 pri=
ntf(" symbolic link\n"); =A0 =A0 =A0 =A0 =A0 =A0 ft =3D 'l'; break;
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0case S_IFSOCK: =A0pri=
ntf(" socket\n"); =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0ft =3D 's'; br=
eak;
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0default:
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0print=
f("unknown type (%o)\n", xst->st_mode & S_IFMT);
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0ft =3D=
 '?';
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0break=
;
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0}
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0}
>>
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0sprintf(buffer, "%02x:%02x", xst->st_=
dev.major, xst->st_dev.minor);
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0printf("Device: %-15s", buffer);
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0if (xst->st_result_mask & XSTAT_REQUE=
ST_INO)
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0printf(" Inode: %-11l=
lu", xst->st_ino);
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0if (xst->st_result_mask & XSTAT_REQUE=
ST_SIZE)
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0printf(" Links: %-5u"=
, xst->st_nlink);
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0if (xst->st_result_mask & XSTAT_REQUE=
ST_RDEV)
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0printf(" Device type:=
 %u,%u",
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 xst->st_=
rdev.major, xst->st_rdev.minor);
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0printf("\n");
>>
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0if (xst->st_result_mask & XSTAT_REQUE=
ST_MODE)
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0printf("Access: (%04o=
/%c%c%c%c%c%c%c%c%c%c) =A0",
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 xst->st_=
mode & 07777,
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 ft,
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 xst->st_=
mode & S_IRUSR ? 'r' : '-',
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 xst->st_=
mode & S_IWUSR ? 'w' : '-',
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 xst->st_=
mode & S_IXUSR ? 'x' : '-',
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 xst->st_=
mode & S_IRGRP ? 'r' : '-',
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 xst->st_=
mode & S_IWGRP ? 'w' : '-',
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 xst->st_=
mode & S_IXGRP ? 'x' : '-',
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 xst->st_=
mode & S_IROTH ? 'r' : '-',
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 xst->st_=
mode & S_IWOTH ? 'w' : '-',
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 xst->st_=
mode & S_IXOTH ? 'x' : '-');
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0if (xst->st_result_mask & XSTAT_REQUE=
ST_UID)
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0printf("Uid: %d =A0 \=
n", xst->st_uid);
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0if (xst->st_result_mask & XSTAT_REQUE=
ST_GID)
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0printf("Gid: %u\n", x=
st->st_gid);
>>
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0if (xst->st_result_mask & XSTAT_REQUE=
ST_ATIME)
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0print_time("Access: "=
, &xst->st_atim);
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0if (xst->st_result_mask & XSTAT_REQUE=
ST_MTIME)
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0print_time("Modify: "=
, &xst->st_mtim);
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0if (xst->st_result_mask & XSTAT_REQUE=
ST_CTIME)
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0print_time("Change: "=
, &xst->st_ctim);
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0if (xst->st_result_mask & XSTAT_REQUE=
ST_BTIME)
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0print_time("Create: "=
, &xst->st_btim);
>>
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0if (xst->st_result_mask & XSTAT_REQUE=
ST_GEN)
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0printf("Inode version=
: %llxh\n", xst->st_gen);
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0if (xst->st_result_mask & XSTAT_REQUE=
ST_DATA_VERSION)
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0printf("Data version:=
 %llxh\n", xst->st_data_version);
>> =A0 =A0 =A0 =A0}
>>
>> =A0 =A0 =A0 =A0int main(int argc, char **argv)
>> =A0 =A0 =A0 =A0{
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0struct xstat_parameters params;
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0struct xstat xst;
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0int ret, atflag =3D AT_SYMLINK_NOFOLL=
OW;
>>
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0unsigned long long query =3D
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0XSTAT_REQUEST__BASIC_=
STATS |
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0XSTAT_REQUEST_BTIME |
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0XSTAT_REQUEST_GEN |
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0XSTAT_REQUEST_DATA_VE=
RSION;
>>
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0for (argv++; *argv; argv++) {
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0if (strcmp(*argv, "-F=
") =3D=3D 0) {
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0atfla=
g |=3D AT_FORCE_ATTR_SYNC;
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0conti=
nue;
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0}
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0if (strcmp(*argv, "-L=
") =3D=3D 0) {
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0atfla=
g &=3D ~AT_SYMLINK_NOFOLLOW;
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0conti=
nue;
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0}
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0if (strcmp(*argv, "-O=
") =3D=3D 0) {
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0query=
 &=3D ~XSTAT_REQUEST__BASIC_STATS;
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0conti=
nue;
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0}
>>
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0memset(&xst, 0xbf, si=
zeof(xst));
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0params.request_mask =3D=
 query;
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0ret =3D xstat(AT_FDCW=
D, *argv, atflag, &params, &xst, sizeof(xst));
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0printf("xstat(%s) =3D=
 %d\n", *argv, ret);
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0if (ret < 0) {
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0perro=
r(*argv);
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0exit(=
1);
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0}
>>
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0dump_xstat(&xst);
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0}
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0return 0;
>> =A0 =A0 =A0 =A0}
>>
>> Just compile and run, passing it paths to the files you want to exam=
ine:
>>
>> =A0 =A0 =A0 =A0[root@andromeda ~]# /tmp/xstat -O /dev/tty
>> =A0 =A0 =A0 =A0xstat(/dev/tty) =3D 152
>> =A0 =A0 =A0 =A0results=3D7ff
>> =A0 =A0 =A0 =A0 =A0Size: 0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 Blocks: 0 =A0=
 =A0 =A0 =A0 =A0IO Block: 4096 =A0 =A0character special file
>> =A0 =A0 =A0 =A0Device: 00:0f =A0 =A0 =A0 =A0 =A0 Inode: 246 =A0 =A0 =
=A0 =A0 Links: 1 =A0 =A0 Device type: 5,0
>> =A0 =A0 =A0 =A0Access: (0666/crw-rw-rw-) =A0Uid: 0
>> =A0 =A0 =A0 =A0Gid: 5
>> =A0 =A0 =A0 =A0Access: 2010-06-30 16:25:01.813517001+0100
>> =A0 =A0 =A0 =A0Modify: 2010-06-30 16:25:01.813517001+0100
>> =A0 =A0 =A0 =A0Change: 2010-06-30 16:25:01.813517001+0100
>>
>> =A0 =A0 =A0 =A0[root@andromeda ~]# /tmp/xstat /var/cache/fscache/cac=
he/
>> =A0 =A0 =A0 =A0xstat(/var/cache/fscache/cache/) =3D 152
>> =A0 =A0 =A0 =A0results=3D3fef
>> =A0 =A0 =A0 =A0 =A0Size: 4096 =A0 =A0 =A0 =A0 =A0 =A0Blocks: 16 =A0 =
=A0 =A0 =A0 IO Block: 4096 =A0 =A0directory
>> =A0 =A0 =A0 =A0Device: 08:06 =A0 =A0 =A0 =A0 =A0 Inode: 130561 =A0 =A0=
 =A0Links: 3
>> =A0 =A0 =A0 =A0Access: (0700/drwx------) =A0Uid: 0
>> =A0 =A0 =A0 =A0Gid: 0
>> =A0 =A0 =A0 =A0Access: 2010-06-29 18:16:33.680703545+0100
>> =A0 =A0 =A0 =A0Modify: 2010-06-29 18:16:20.132786632+0100
>> =A0 =A0 =A0 =A0Change: 2010-06-29 18:16:20.132786632+0100
>> =A0 =A0 =A0 =A0Create: 2010-06-25 15:17:39.471199293+0100
>> =A0 =A0 =A0 =A0Inode version: f585ab70h
>> =A0 =A0 =A0 =A0Data version: 2h
>>
>> Signed-off-by: David Howells <dhowells@redhat.com>
>> ---
>>
>> =A0arch/x86/include/asm/unistd_32.h | =A0 =A04 +
>> =A0arch/x86/include/asm/unistd_64.h | =A0 =A04 +
>> =A0fs/afs/inode.c =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 | =A0 11 +-
>> =A0fs/ecryptfs/inode.c =A0 =A0 =A0 =A0 =A0 =A0 =A0| =A0 =A02
>> =A0fs/ext4/ext4.h =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 | =A0 =A02
>> =A0fs/ext4/file.c =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 | =A0 =A02
>> =A0fs/ext4/inode.c =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0| =A0 27 +++++=
-
>> =A0fs/ext4/namei.c =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0| =A0 =A02
>> =A0fs/ext4/symlink.c =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0| =A0 =A02
>> =A0fs/nfs/inode.c =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 | =A0 46 +++++=
++---
>> =A0fs/nfsd/nfs3proc.c =A0 =A0 =A0 =A0 =A0 =A0 =A0 | =A0 =A02
>> =A0fs/nfsd/nfs3xdr.c =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0| =A0 =A04 +
>> =A0fs/nfsd/nfs4xdr.c =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0| =A0 =A04 +
>> =A0fs/nfsd/nfsproc.c =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0| =A0 =A06 +
>> =A0fs/nfsd/nfsxdr.c =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 | =A0 =A02
>> =A0fs/stat.c =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0| =A0175=
 ++++++++++++++++++++++++++++++++++----
>> =A0include/linux/fcntl.h =A0 =A0 =A0 =A0 =A0 =A0| =A0 =A01
>> =A0include/linux/fs.h =A0 =A0 =A0 =A0 =A0 =A0 =A0 | =A0 =A02
>> =A0include/linux/stat.h =A0 =A0 =A0 =A0 =A0 =A0 | =A0103 +++++++++++=
+++++++++++
>> =A0include/linux/syscalls.h =A0 =A0 =A0 =A0 | =A0 =A09 ++
>> =A020 files changed, 368 insertions(+), 42 deletions(-)
>>
>> diff --git a/arch/x86/include/asm/unistd_32.h b/arch/x86/include/asm=
/unistd_32.h
>> index beb9b5f..a9953cc 100644
>> --- a/arch/x86/include/asm/unistd_32.h
>> +++ b/arch/x86/include/asm/unistd_32.h
>> @@ -343,10 +343,12 @@
>> =A0#define __NR_rt_tgsigqueueinfo 335
>> =A0#define __NR_perf_event_open =A0 336
>> =A0#define __NR_recvmmsg =A0 =A0 =A0 =A0 =A0337
>> +#define __NR_xstat =A0 =A0 =A0 =A0 =A0 =A0 338
>> +#define __NR_fxstat =A0 =A0 =A0 =A0 =A0 =A0339
>>
>> =A0#ifdef __KERNEL__
>>
>> -#define NR_syscalls 338
>> +#define NR_syscalls 340
>>
>> =A0#define __ARCH_WANT_IPC_PARSE_VERSION
>> =A0#define __ARCH_WANT_OLD_READDIR
>> diff --git a/arch/x86/include/asm/unistd_64.h b/arch/x86/include/asm=
/unistd_64.h
>> index ff4307b..c90d240 100644
>> --- a/arch/x86/include/asm/unistd_64.h
>> +++ b/arch/x86/include/asm/unistd_64.h
>> @@ -663,6 +663,10 @@ __SYSCALL(__NR_rt_tgsigqueueinfo, sys_rt_tgsigq=
ueueinfo)
>> =A0__SYSCALL(__NR_perf_event_open, sys_perf_event_open)
>> =A0#define __NR_recvmmsg =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0=
 =A0 =A0299
>> =A0__SYSCALL(__NR_recvmmsg, sys_recvmmsg)
>> +#define __NR_xstat =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =
=A0 =A0 300
>> +__SYSCALL(__NR_xstat, sys_xstat)
>> +#define __NR_fxstat =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0=
 =A0 =A0301
>> +__SYSCALL(__NR_fxstat, sys_fxstat)
>>
>> =A0#ifndef __NO_STUBS
>> =A0#define __ARCH_WANT_OLD_READDIR
>> diff --git a/fs/afs/inode.c b/fs/afs/inode.c
>> index ee3190a..f624c5a 100644
>> --- a/fs/afs/inode.c
>> +++ b/fs/afs/inode.c
>> @@ -300,16 +300,17 @@ error_unlock:
>> =A0/*
>> =A0* read the attributes of an inode
>> =A0*/
>> -int afs_getattr(struct vfsmount *mnt, struct dentry *dentry,
>> - =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 struct kstat *stat)
>> +int afs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct=
 kstat *stat)
>> =A0{
>> - =A0 =A0 =A0 struct inode *inode;
>> -
>> - =A0 =A0 =A0 inode =3D dentry->d_inode;
>> + =A0 =A0 =A0 struct inode *inode =3D dentry->d_inode;
>>
>> =A0 =A0 =A0 =A0_enter("{ ino=3D%lu v=3D%u }", inode->i_ino, inode->i=
_generation);
>>
>> =A0 =A0 =A0 =A0generic_fillattr(inode, stat);
>> +
>> + =A0 =A0 =A0 stat->result_mask |=3D XSTAT_REQUEST_GEN | XSTAT_REQUE=
ST_DATA_VERSION;
>> + =A0 =A0 =A0 stat->gen =3D inode->i_generation;
>> + =A0 =A0 =A0 stat->data_version =3D inode->i_version;
>> =A0 =A0 =A0 =A0return 0;
>> =A0}
>>
>> diff --git a/fs/ecryptfs/inode.c b/fs/ecryptfs/inode.c
>> index 31ef525..0b02272 100644
>> --- a/fs/ecryptfs/inode.c
>> +++ b/fs/ecryptfs/inode.c
>> @@ -994,6 +994,8 @@ int ecryptfs_getattr(struct vfsmount *mnt, struc=
t dentry *dentry,
>> =A0 =A0 =A0 =A0struct kstat lower_stat;
>> =A0 =A0 =A0 =A0int rc;
>>
>> + =A0 =A0 =A0 lower_stat.query_flags =3D stat->query_flags;
>> + =A0 =A0 =A0 lower_stat.request_mask =3D stat->request_mask | XSTAT=
_REQUEST_BLOCKS;
>> =A0 =A0 =A0 =A0rc =3D vfs_getattr(ecryptfs_dentry_to_lower_mnt(dentr=
y),
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 ecryptfs_dentry_to_l=
ower(dentry), &lower_stat);
>> =A0 =A0 =A0 =A0if (!rc) {
>> diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
>> index 19a4de5..96823f3 100644
>> --- a/fs/ext4/ext4.h
>> +++ b/fs/ext4/ext4.h
>> @@ -1571,6 +1571,8 @@ extern int =A0ext4_write_inode(struct inode *,=
 struct writeback_control *);
>> =A0extern int =A0ext4_setattr(struct dentry *, struct iattr *);
>> =A0extern int =A0ext4_getattr(struct vfsmount *mnt, struct dentry *d=
entry,
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0struc=
t kstat *stat);
>> +extern int =A0ext4_file_getattr(struct vfsmount *mnt, struct dentry=
 *dentry,
>> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 struct=
 kstat *stat);
>> =A0extern void ext4_delete_inode(struct inode *);
>> =A0extern int =A0ext4_sync_inode(handle_t *, struct inode *);
>> =A0extern void ext4_dirty_inode(struct inode *);
>> diff --git a/fs/ext4/file.c b/fs/ext4/file.c
>> index 5313ae4..18c29ab 100644
>> --- a/fs/ext4/file.c
>> +++ b/fs/ext4/file.c
>> @@ -150,7 +150,7 @@ const struct file_operations ext4_file_operation=
s =3D {
>> =A0const struct inode_operations ext4_file_inode_operations =3D {
>> =A0 =A0 =A0 =A0.truncate =A0 =A0 =A0 =3D ext4_truncate,
>> =A0 =A0 =A0 =A0.setattr =A0 =A0 =A0 =A0=3D ext4_setattr,
>> - =A0 =A0 =A0 .getattr =A0 =A0 =A0 =A0=3D ext4_getattr,
>> + =A0 =A0 =A0 .getattr =A0 =A0 =A0 =A0=3D ext4_file_getattr,
>> =A0#ifdef CONFIG_EXT4_FS_XATTR
>> =A0 =A0 =A0 =A0.setxattr =A0 =A0 =A0 =3D generic_setxattr,
>> =A0 =A0 =A0 =A0.getxattr =A0 =A0 =A0 =3D generic_getxattr,
>> diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
>> index 42272d6..f9a730a 100644
>> --- a/fs/ext4/inode.c
>> +++ b/fs/ext4/inode.c
>> @@ -5550,12 +5550,33 @@ err_out:
>> =A0int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 struct kstat *stat)
>> =A0{
>> - =A0 =A0 =A0 struct inode *inode;
>> - =A0 =A0 =A0 unsigned long delalloc_blocks;
>> + =A0 =A0 =A0 struct inode *inode =3D dentry->d_inode;
>>
>> - =A0 =A0 =A0 inode =3D dentry->d_inode;
>> =A0 =A0 =A0 =A0generic_fillattr(inode, stat);
>>
>> + =A0 =A0 =A0 stat->result_mask |=3D XSTAT_REQUEST_BTIME;
>> + =A0 =A0 =A0 stat->btime.tv_sec =3D EXT4_I(inode)->i_crtime.tv_sec;
>> + =A0 =A0 =A0 stat->btime.tv_nsec =3D EXT4_I(inode)->i_crtime.tv_nse=
c;
>> +
>> + =A0 =A0 =A0 if (inode->i_ino !=3D EXT4_ROOT_INO) {
>> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 stat->result_mask |=3D XSTAT_REQUEST_G=
EN;
>> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 stat->gen =3D inode->i_generation;
>> + =A0 =A0 =A0 }
>> + =A0 =A0 =A0 if (S_ISDIR(inode->i_mode) || test_opt(inode->i_sb, I_=
VERSION)) {
>> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 stat->result_mask |=3D XSTAT_REQUEST_D=
ATA_VERSION;
>> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 stat->data_version =3D inode->i_versio=
n;
>> + =A0 =A0 =A0 }
>> + =A0 =A0 =A0 return 0;
>> +}
>> +
>> +int ext4_file_getattr(struct vfsmount *mnt, struct dentry *dentry,
>> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 struct kstat *stat)
>> +{
>> + =A0 =A0 =A0 struct inode *inode =3D dentry->d_inode;
>> + =A0 =A0 =A0 unsigned long delalloc_blocks;
>> +
>> + =A0 =A0 =A0 ext4_getattr(mnt, dentry, stat);
>> +
>> =A0 =A0 =A0 =A0/*
>> =A0 =A0 =A0 =A0 * We can't update i_blocks if the block allocation i=
s delayed
>> =A0 =A0 =A0 =A0 * otherwise in the case of system crash before the r=
eal block
>> diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
>> index a43e661..0f776c7 100644
>> --- a/fs/ext4/namei.c
>> +++ b/fs/ext4/namei.c
>> @@ -2542,6 +2542,7 @@ const struct inode_operations ext4_dir_inode_o=
perations =3D {
>> =A0 =A0 =A0 =A0.mknod =A0 =A0 =A0 =A0 =A0=3D ext4_mknod,
>> =A0 =A0 =A0 =A0.rename =A0 =A0 =A0 =A0 =3D ext4_rename,
>> =A0 =A0 =A0 =A0.setattr =A0 =A0 =A0 =A0=3D ext4_setattr,
>> + =A0 =A0 =A0 .getattr =A0 =A0 =A0 =A0=3D ext4_getattr,
>> =A0#ifdef CONFIG_EXT4_FS_XATTR
>> =A0 =A0 =A0 =A0.setxattr =A0 =A0 =A0 =3D generic_setxattr,
>> =A0 =A0 =A0 =A0.getxattr =A0 =A0 =A0 =3D generic_getxattr,
>> @@ -2554,6 +2555,7 @@ const struct inode_operations ext4_dir_inode_o=
perations =3D {
>>
>> =A0const struct inode_operations ext4_special_inode_operations =3D {
>> =A0 =A0 =A0 =A0.setattr =A0 =A0 =A0 =A0=3D ext4_setattr,
>> + =A0 =A0 =A0 .getattr =A0 =A0 =A0 =A0=3D ext4_getattr,
>> =A0#ifdef CONFIG_EXT4_FS_XATTR
>> =A0 =A0 =A0 =A0.setxattr =A0 =A0 =A0 =3D generic_setxattr,
>> =A0 =A0 =A0 =A0.getxattr =A0 =A0 =A0 =3D generic_getxattr,
>> diff --git a/fs/ext4/symlink.c b/fs/ext4/symlink.c
>> index ed9354a..d8fe7fb 100644
>> --- a/fs/ext4/symlink.c
>> +++ b/fs/ext4/symlink.c
>> @@ -35,6 +35,7 @@ const struct inode_operations ext4_symlink_inode_o=
perations =3D {
>> =A0 =A0 =A0 =A0.follow_link =A0 =A0=3D page_follow_link_light,
>> =A0 =A0 =A0 =A0.put_link =A0 =A0 =A0 =3D page_put_link,
>> =A0 =A0 =A0 =A0.setattr =A0 =A0 =A0 =A0=3D ext4_setattr,
>> + =A0 =A0 =A0 .getattr =A0 =A0 =A0 =A0=3D ext4_getattr,
>> =A0#ifdef CONFIG_EXT4_FS_XATTR
>> =A0 =A0 =A0 =A0.setxattr =A0 =A0 =A0 =3D generic_setxattr,
>> =A0 =A0 =A0 =A0.getxattr =A0 =A0 =A0 =3D generic_getxattr,
>> @@ -47,6 +48,7 @@ const struct inode_operations ext4_fast_symlink_in=
ode_operations =3D {
>> =A0 =A0 =A0 =A0.readlink =A0 =A0 =A0 =3D generic_readlink,
>> =A0 =A0 =A0 =A0.follow_link =A0 =A0=3D ext4_follow_link,
>> =A0 =A0 =A0 =A0.setattr =A0 =A0 =A0 =A0=3D ext4_setattr,
>> + =A0 =A0 =A0 .getattr =A0 =A0 =A0 =A0=3D ext4_getattr,
>> =A0#ifdef CONFIG_EXT4_FS_XATTR
>> =A0 =A0 =A0 =A0.setxattr =A0 =A0 =A0 =3D generic_setxattr,
>> =A0 =A0 =A0 =A0.getxattr =A0 =A0 =A0 =3D generic_getxattr,
>> diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
>> index 099b351..8c6de96 100644
>> --- a/fs/nfs/inode.c
>> +++ b/fs/nfs/inode.c
>> @@ -495,11 +495,21 @@ void nfs_setattr_update_inode(struct inode *in=
ode, struct iattr *attr)
>> =A0int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, stru=
ct kstat *stat)
>> =A0{
>> =A0 =A0 =A0 =A0struct inode *inode =3D dentry->d_inode;
>> + =A0 =A0 =A0 unsigned force =3D stat->query_flags & AT_FORCE_ATTR_S=
YNC;
>> =A0 =A0 =A0 =A0int need_atime =3D NFS_I(inode)->cache_validity & NFS=
_INO_INVALID_ATIME;
>> =A0 =A0 =A0 =A0int err;
>>
>> - =A0 =A0 =A0 /* Flush out writes to the server in order to update c=
/mtime. =A0*/
>> - =A0 =A0 =A0 if (S_ISREG(inode->i_mode)) {
>> + =A0 =A0 =A0 if (NFS_SERVER(inode)->nfs_client->rpc_ops->version < =
4)
>> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 stat->request_mask &=3D ~XSTAT_REQUEST=
_DATA_VERSION;
>> +
>> + =A0 =A0 =A0 /* Flush out writes to the server in order to update c=
/mtime
>> + =A0 =A0 =A0 =A0* or data version if the user wants them */
>> + =A0 =A0 =A0 if ((force || stat->request_mask & (XSTAT_REQUEST_MTIM=
E |
>> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0=
 =A0 =A0 =A0 =A0 XSTAT_REQUEST_CTIME |
>> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0=
 =A0 =A0 =A0 =A0 XSTAT_REQUEST_DATA_VERSION
>> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0=
 =A0 =A0 =A0 =A0 )) &&
>> + =A0 =A0 =A0 =A0 =A0 S_ISREG(inode->i_mode)
>> + =A0 =A0 =A0 =A0 =A0 ) {
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0err =3D filemap_write_and_wait(inode-=
>i_mapping);
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0if (err)
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0goto out;
>> @@ -514,18 +524,30 @@ int nfs_getattr(struct vfsmount *mnt, struct d=
entry *dentry, struct kstat *stat)
>> =A0 =A0 =A0 =A0 * =A0- NFS never sets MS_NOATIME or MS_NODIRATIME so=
 there is
>> =A0 =A0 =A0 =A0 * =A0 =A0no point in checking those.
>> =A0 =A0 =A0 =A0 */
>> - =A0 =A0 =A0 if ((mnt->mnt_flags & MNT_NOATIME) ||
>> - =A0 =A0 =A0 =A0 =A0 ((mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(=
inode->i_mode)))
>> + =A0 =A0 =A0 if (!(stat->request_mask & XSTAT_REQUEST_ATIME) ||
>> + =A0 =A0 =A0 =A0 =A0 (mnt->mnt_flags & MNT_NOATIME) ||
>> + =A0 =A0 =A0 =A0 =A0 ((mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(=
inode->i_mode)))
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0need_atime =3D 0;
>>
>> - =A0 =A0 =A0 if (need_atime)
>> - =A0 =A0 =A0 =A0 =A0 =A0 =A0 err =3D __nfs_revalidate_inode(NFS_SER=
VER(inode), inode);
>> - =A0 =A0 =A0 else
>> - =A0 =A0 =A0 =A0 =A0 =A0 =A0 err =3D nfs_revalidate_inode(NFS_SERVE=
R(inode), inode);
>> - =A0 =A0 =A0 if (!err) {
>> - =A0 =A0 =A0 =A0 =A0 =A0 =A0 generic_fillattr(inode, stat);
>> - =A0 =A0 =A0 =A0 =A0 =A0 =A0 stat->ino =3D nfs_compat_user_ino64(NF=
S_FILEID(inode));
>> + =A0 =A0 =A0 if (force || stat->request_mask & (XSTAT_REQUEST__BASI=
C_STATS |
>> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0=
 =A0 =A0 =A0 =A0XSTAT_REQUEST_DATA_VERSION)
>> + =A0 =A0 =A0 =A0 =A0 ) {
>> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 if (force || need_atime)
>> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 err =3D __nfs_revalida=
te_inode(NFS_SERVER(inode), inode);
>> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 else
>> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 err =3D nfs_revalidate=
_inode(NFS_SERVER(inode), inode);
>> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 if (err)
>> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 goto out;
>> =A0 =A0 =A0 =A0}
>> +
>> + =A0 =A0 =A0 generic_fillattr(inode, stat);
>> + =A0 =A0 =A0 stat->ino =3D nfs_compat_user_ino64(NFS_FILEID(inode))=
;
>> +
>> + =A0 =A0 =A0 if (stat->request_mask & XSTAT_REQUEST_DATA_VERSION) {
>> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 stat->data_version =3D NFS_I(inode)->c=
hange_attr;
>> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 stat->result_mask |=3D XSTAT_REQUEST_D=
ATA_VERSION;
>> + =A0 =A0 =A0 }
>> +
>> =A0out:
>> =A0 =A0 =A0 =A0return err;
>> =A0}
>> @@ -770,7 +792,7 @@ int nfs_revalidate_inode(struct nfs_server *serv=
er, struct inode *inode)
>> =A0static int nfs_invalidate_mapping(struct inode *inode, struct add=
ress_space *mapping)
>> =A0{
>> =A0 =A0 =A0 =A0struct nfs_inode *nfsi =3D NFS_I(inode);
>> -
>> +
>> =A0 =A0 =A0 =A0if (mapping->nrpages !=3D 0) {
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0int ret =3D invalidate_inode_pages2(m=
apping);
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0if (ret < 0)
>> diff --git a/fs/nfsd/nfs3proc.c b/fs/nfsd/nfs3proc.c
>> index 3d68f45..310ff05 100644
>> --- a/fs/nfsd/nfs3proc.c
>> +++ b/fs/nfsd/nfs3proc.c
>> @@ -55,6 +55,8 @@ nfsd3_proc_getattr(struct svc_rqst *rqstp, struct =
nfsd_fhandle =A0*argp,
>> =A0 =A0 =A0 =A0if (nfserr)
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0RETURN_STATUS(nfserr);
>>
>> + =A0 =A0 =A0 resp->stat.query_flags =3D 0;
>> + =A0 =A0 =A0 resp->stat.request_mask =3D XSTAT_REQUEST__EXTENDED_ST=
ATS;
>> =A0 =A0 =A0 =A0err =3D vfs_getattr(resp->fh.fh_export->ex_path.mnt,
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0resp->fh.fh_dentr=
y, &resp->stat);
>> =A0 =A0 =A0 =A0nfserr =3D nfserrno(err);
>> diff --git a/fs/nfsd/nfs3xdr.c b/fs/nfsd/nfs3xdr.c
>> index 2a533a0..eaa3c3b 100644
>> --- a/fs/nfsd/nfs3xdr.c
>> +++ b/fs/nfsd/nfs3xdr.c
>> @@ -205,6 +205,8 @@ encode_post_op_attr(struct svc_rqst *rqstp, __be=
32 *p, struct svc_fh *fhp)
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0int err;
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0struct kstat stat;
>>
>> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 stat.query_flags =3D 0;
>> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 stat.request_mask =3D XSTAT_REQUEST__E=
XTENDED_STATS;
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0err =3D vfs_getattr(fhp->fh_export->e=
x_path.mnt, dentry, &stat);
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0if (!err) {
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0*p++ =3D xdr_one; =A0=
 =A0 =A0 =A0 /* attributes follow */
>> @@ -257,6 +259,8 @@ void fill_post_wcc(struct svc_fh *fhp)
>> =A0 =A0 =A0 =A0if (fhp->fh_post_saved)
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0printk("nfsd: inode locked twice duri=
ng operation.\n");
>>
>> + =A0 =A0 =A0 fhp->fh_post_attr.query_flags =3D 0;
>> + =A0 =A0 =A0 fhp->fh_post_attr.request_mask =3D XSTAT_REQUEST__EXTE=
NDED_STATS;
>> =A0 =A0 =A0 =A0err =3D vfs_getattr(fhp->fh_export->ex_path.mnt, fhp-=
>fh_dentry,
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0&fhp->fh_post_attr);
>> =A0 =A0 =A0 =A0fhp->fh_post_change =3D fhp->fh_dentry->d_inode->i_ve=
rsion;
>> diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
>> index ac17a70..e9d1b59 100644
>> --- a/fs/nfsd/nfs4xdr.c
>> +++ b/fs/nfsd/nfs4xdr.c
>> @@ -1769,6 +1769,8 @@ nfsd4_encode_fattr(struct svc_fh *fhp, struct =
svc_export *exp,
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0goto out;
>> =A0 =A0 =A0 =A0}
>>
>> + =A0 =A0 =A0 stat.query_flags =3D 0;
>> + =A0 =A0 =A0 stat.request_mask =3D XSTAT_REQUEST__EXTENDED_STATS;
>> =A0 =A0 =A0 =A0err =3D vfs_getattr(exp->ex_path.mnt, dentry, &stat);
>> =A0 =A0 =A0 =A0if (err)
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0goto out_nfserr;
>> @@ -2139,6 +2141,8 @@ out_acl:
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0if (p=
ath.dentry !=3D path.mnt->mnt_root)
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =
=A0 =A0 =A0break;
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0}
>> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 stat.query_flags =3D 0=
;
>> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 stat.request_mask =3D =
XSTAT_REQUEST__EXTENDED_STATS;
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0err =3D vfs_getattr(p=
ath.mnt, path.dentry, &stat);
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0path_put(&path);
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0if (err)
>> diff --git a/fs/nfsd/nfsproc.c b/fs/nfsd/nfsproc.c
>> index a047ad6..7c0e74b 100644
>> --- a/fs/nfsd/nfsproc.c
>> +++ b/fs/nfsd/nfsproc.c
>> @@ -26,6 +26,8 @@ static __be32
>> =A0nfsd_return_attrs(__be32 err, struct nfsd_attrstat *resp)
>> =A0{
>> =A0 =A0 =A0 =A0if (err) return err;
>> + =A0 =A0 =A0 resp->stat.query_flags =3D 0;
>> + =A0 =A0 =A0 resp->stat.request_mask =3D XSTAT_REQUEST__EXTENDED_ST=
ATS;
>> =A0 =A0 =A0 =A0return nfserrno(vfs_getattr(resp->fh.fh_export->ex_pa=
th.mnt,
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =
=A0resp->fh.fh_dentry,
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =
=A0&resp->stat));
>> @@ -34,6 +36,8 @@ static __be32
>> =A0nfsd_return_dirop(__be32 err, struct nfsd_diropres *resp)
>> =A0{
>> =A0 =A0 =A0 =A0if (err) return err;
>> + =A0 =A0 =A0 resp->stat.query_flags =3D 0;
>> + =A0 =A0 =A0 resp->stat.request_mask =3D XSTAT_REQUEST__EXTENDED_ST=
ATS;
>> =A0 =A0 =A0 =A0return nfserrno(vfs_getattr(resp->fh.fh_export->ex_pa=
th.mnt,
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =
=A0resp->fh.fh_dentry,
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =
=A0&resp->stat));
>> @@ -150,6 +154,8 @@ nfsd_proc_read(struct svc_rqst *rqstp, struct nf=
sd_readargs *argp,
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0&=
resp->count);
>>
>> =A0 =A0 =A0 =A0if (nfserr) return nfserr;
>> + =A0 =A0 =A0 resp->stat.query_flags =3D 0;
>> + =A0 =A0 =A0 resp->stat.request_mask =3D XSTAT_REQUEST__EXTENDED_ST=
ATS;
>> =A0 =A0 =A0 =A0return nfserrno(vfs_getattr(resp->fh.fh_export->ex_pa=
th.mnt,
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =
=A0resp->fh.fh_dentry,
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =
=A0&resp->stat));
>> diff --git a/fs/nfsd/nfsxdr.c b/fs/nfsd/nfsxdr.c
>> index 4ce005d..a595fb6 100644
>> --- a/fs/nfsd/nfsxdr.c
>> +++ b/fs/nfsd/nfsxdr.c
>> @@ -197,6 +197,8 @@ encode_fattr(struct svc_rqst *rqstp, __be32 *p, =
struct svc_fh *fhp,
>> =A0__be32 *nfs2svc_encode_fattr(struct svc_rqst *rqstp, __be32 *p, s=
truct svc_fh *fhp)
>> =A0{
>> =A0 =A0 =A0 =A0struct kstat stat;
>> + =A0 =A0 =A0 stat.query_flags =3D 0;
>> + =A0 =A0 =A0 stat.request_mask =3D XSTAT_REQUEST__EXTENDED_STATS;
>> =A0 =A0 =A0 =A0vfs_getattr(fhp->fh_export->ex_path.mnt, fhp->fh_dent=
ry, &stat);
>> =A0 =A0 =A0 =A0return encode_fattr(rqstp, p, fhp, &stat);
>> =A0}
>> diff --git a/fs/stat.c b/fs/stat.c
>> index 12e90e2..2fb1527 100644
>> --- a/fs/stat.c
>> +++ b/fs/stat.c
>> @@ -33,6 +33,9 @@ void generic_fillattr(struct inode *inode, struct =
kstat *stat)
>> =A0 =A0 =A0 =A0stat->size =3D i_size_read(inode);
>> =A0 =A0 =A0 =A0stat->blocks =3D inode->i_blocks;
>> =A0 =A0 =A0 =A0stat->blksize =3D (1 << inode->i_blkbits);
>> + =A0 =A0 =A0 stat->result_mask |=3D XSTAT_REQUEST__BASIC_STATS & ~X=
STAT_REQUEST_RDEV;
>> + =A0 =A0 =A0 if (unlikely(S_ISBLK(stat->mode) || S_ISCHR(stat->mode=
)))
>> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 stat->result_mask |=3D XSTAT_REQUEST_R=
DEV;
>> =A0}
>>
>> =A0EXPORT_SYMBOL(generic_fillattr);
>> @@ -42,6 +45,8 @@ int vfs_getattr(struct vfsmount *mnt, struct dentr=
y *dentry, struct kstat *stat)
>> =A0 =A0 =A0 =A0struct inode *inode =3D dentry->d_inode;
>> =A0 =A0 =A0 =A0int retval;
>>
>> + =A0 =A0 =A0 stat->result_mask =3D 0;
>> +
>> =A0 =A0 =A0 =A0retval =3D security_inode_getattr(mnt, dentry);
>> =A0 =A0 =A0 =A0if (retval)
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0return retval;
>> @@ -55,41 +60,64 @@ int vfs_getattr(struct vfsmount *mnt, struct den=
try *dentry, struct kstat *stat)
>>
>> =A0EXPORT_SYMBOL(vfs_getattr);
>>
>> -int vfs_fstat(unsigned int fd, struct kstat *stat)
>> +/*
>> + * VFS entrypoint to get extended stats by file descriptor
>> + */
>> +int vfs_fxstat(unsigned int fd, int flags, struct kstat *stat)
>> =A0{
>> =A0 =A0 =A0 =A0struct file *f =3D fget(fd);
>> =A0 =A0 =A0 =A0int error =3D -EBADF;
>>
>> + =A0 =A0 =A0 if (flags & ~KSTAT_QUERY_FLAGS)
>> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 return -EINVAL;
>> + =A0 =A0 =A0 stat->query_flags =3D flags;
>> +
>> =A0 =A0 =A0 =A0if (f) {
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0error =3D vfs_getattr(f->f_path.mnt, =
f->f_path.dentry, stat);
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0fput(f);
>> =A0 =A0 =A0 =A0}
>> =A0 =A0 =A0 =A0return error;
>> =A0}
>> +EXPORT_SYMBOL(vfs_fxstat);
>> +
>> +int vfs_fstat(unsigned int fd, struct kstat *stat)
>> +{
>> + =A0 =A0 =A0 stat->request_mask =3D XSTAT_REQUEST__BASIC_STATS;
>> + =A0 =A0 =A0 return vfs_fxstat(fd, 0, stat);
>> +}
>> =A0EXPORT_SYMBOL(vfs_fstat);
>>
>> -int vfs_fstatat(int dfd, const char __user *filename, struct kstat =
*stat,
>> - =A0 =A0 =A0 =A0 =A0 =A0 =A0 int flag)
>> +/*
>> + * VFS entrypoint to get extended stats by filename
>> + */
>> +int vfs_xstat(int dfd, const char __user *filename, int flags,
>> + =A0 =A0 =A0 =A0 =A0 =A0 struct kstat *stat)
>> =A0{
>> =A0 =A0 =A0 =A0struct path path;
>> - =A0 =A0 =A0 int error =3D -EINVAL;
>> - =A0 =A0 =A0 int lookup_flags =3D 0;
>> + =A0 =A0 =A0 int error, lookup_flags;
>>
>> - =A0 =A0 =A0 if ((flag & ~AT_SYMLINK_NOFOLLOW) !=3D 0)
>> - =A0 =A0 =A0 =A0 =A0 =A0 =A0 goto out;
>> + =A0 =A0 =A0 if (flags & ~(AT_SYMLINK_NOFOLLOW | KSTAT_QUERY_FLAGS)=
)
>> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 return -EINVAL;
>>
>> - =A0 =A0 =A0 if (!(flag & AT_SYMLINK_NOFOLLOW))
>> - =A0 =A0 =A0 =A0 =A0 =A0 =A0 lookup_flags |=3D LOOKUP_FOLLOW;
>> + =A0 =A0 =A0 stat->query_flags =3D flags;
>> + =A0 =A0 =A0 lookup_flags =3D (flags & AT_SYMLINK_NOFOLLOW) ? 0 : L=
OOKUP_FOLLOW;
>>
>> =A0 =A0 =A0 =A0error =3D user_path_at(dfd, filename, lookup_flags, &=
path);
>> - =A0 =A0 =A0 if (error)
>> - =A0 =A0 =A0 =A0 =A0 =A0 =A0 goto out;
>> -
>> - =A0 =A0 =A0 error =3D vfs_getattr(path.mnt, path.dentry, stat);
>> - =A0 =A0 =A0 path_put(&path);
>> -out:
>> + =A0 =A0 =A0 if (!error) {
>> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 error =3D vfs_getattr(path.mnt, path.d=
entry, stat);
>> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 path_put(&path);
>> + =A0 =A0 =A0 }
>> =A0 =A0 =A0 =A0return error;
>> =A0}
>> +EXPORT_SYMBOL(vfs_xstat);
>> +
>> +int vfs_fstatat(int dfd, const char __user *filename, struct kstat =
*stat,
>> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 int flags)
>> +{
>> + =A0 =A0 =A0 stat->request_mask =3D XSTAT_REQUEST__BASIC_STATS;
>> + =A0 =A0 =A0 stat->query_flags =3D 0;
>> + =A0 =A0 =A0 return vfs_xstat(dfd, filename, flags, stat);
>> +}
>> =A0EXPORT_SYMBOL(vfs_fstatat);
>>
>> =A0int vfs_stat(const char __user *name, struct kstat *stat)
>> @@ -115,7 +143,7 @@ static int cp_old_stat(struct kstat *stat, struc=
t __old_kernel_stat __user * sta
>> =A0{
>> =A0 =A0 =A0 =A0static int warncount =3D 5;
>> =A0 =A0 =A0 =A0struct __old_kernel_stat tmp;
>> -
>> +
>> =A0 =A0 =A0 =A0if (warncount > 0) {
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0warncount--;
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0printk(KERN_WARNING "VFS: Warning: %s=
 using old stat() call. Recompile your binary.\n",
>> @@ -140,7 +168,7 @@ static int cp_old_stat(struct kstat *stat, struc=
t __old_kernel_stat __user * sta
>> =A0#if BITS_PER_LONG =3D=3D 32
>> =A0 =A0 =A0 =A0if (stat->size > MAX_NON_LFS)
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0return -EOVERFLOW;
>> -#endif
>> +#endif
>> =A0 =A0 =A0 =A0tmp.st_size =3D stat->size;
>> =A0 =A0 =A0 =A0tmp.st_atime =3D stat->atime.tv_sec;
>> =A0 =A0 =A0 =A0tmp.st_mtime =3D stat->mtime.tv_sec;
>> @@ -222,7 +250,7 @@ static int cp_new_stat(struct kstat *stat, struc=
t stat __user *statbuf)
>> =A0#if BITS_PER_LONG =3D=3D 32
>> =A0 =A0 =A0 =A0if (stat->size > MAX_NON_LFS)
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0return -EOVERFLOW;
>> -#endif
>> +#endif
>> =A0 =A0 =A0 =A0tmp.st_size =3D stat->size;
>> =A0 =A0 =A0 =A0tmp.st_atime =3D stat->atime.tv_sec;
>> =A0 =A0 =A0 =A0tmp.st_mtime =3D stat->mtime.tv_sec;
>> @@ -408,6 +436,117 @@ SYSCALL_DEFINE4(fstatat64, int, dfd, const cha=
r __user *, filename,
>> =A0}
>> =A0#endif /* __ARCH_WANT_STAT64 */
>>
>> +/*
>> + * Get the xstat parameters if supplied
>> + */
>> +static int xstat_get_params(struct xstat_parameters __user *_params=
,
>> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 struct kstat *=
stat)
>> +{
>> + =A0 =A0 =A0 struct xstat_parameters params;
>> +
>> + =A0 =A0 =A0 memset(stat, 0xde, sizeof(*stat)); =A0 =A0 =A0// DEBUG=
GING
>> +
>> + =A0 =A0 =A0 if (_params) {
>> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 if (copy_from_user(&params, _params, s=
izeof(params)) !=3D 0)
>> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 return -EFAULT;
>> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 stat->request_mask =3D
>> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 params.request_mask & =
XSTAT_REQUEST__ALL_STATS;
>> + =A0 =A0 =A0 } else {
>> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 stat->request_mask =3D XSTAT_REQUEST__=
EXTENDED_STATS;
>> + =A0 =A0 =A0 }
>> + =A0 =A0 =A0 stat->result_mask =3D 0;
>> + =A0 =A0 =A0 return 0;
>> +}
>> +
>> +/*
>> + * copy the extended stats to userspace and return the amount of da=
ta written
>> + * into the buffer
>> + */
>> +static long xstat_set_result(struct kstat *stat,
>> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0struct xsta=
t __user *buffer, size_t bufsize)
>> +{
>> + =A0 =A0 =A0 struct xstat tmp;
>> + =A0 =A0 =A0 size_t copy;
>> +
>> + =A0 =A0 =A0 /* transfer the fixed results */
>> + =A0 =A0 =A0 memset(&tmp, 0, sizeof(tmp));
>> + =A0 =A0 =A0 tmp.st_result_mask =A0 =A0 =A0=3D stat->result_mask;
>> + =A0 =A0 =A0 tmp.st_mode =A0 =A0 =A0 =A0 =A0 =A0 =3D stat->mode;
>> + =A0 =A0 =A0 tmp.st_nlink =A0 =A0 =A0 =A0 =A0 =A0=3D stat->nlink;
>> + =A0 =A0 =A0 tmp.st_uid =A0 =A0 =A0 =A0 =A0 =A0 =A0=3D stat->uid;
>> + =A0 =A0 =A0 tmp.st_gid =A0 =A0 =A0 =A0 =A0 =A0 =A0=3D stat->gid;
>> + =A0 =A0 =A0 tmp.st_blksize =A0 =A0 =A0 =A0 =A0=3D stat->blksize;
>> + =A0 =A0 =A0 tmp.st_rdev.major =A0 =A0 =A0 =3D MAJOR(stat->rdev);
>> + =A0 =A0 =A0 tmp.st_rdev.minor =A0 =A0 =A0 =3D MINOR(stat->rdev);
>> + =A0 =A0 =A0 tmp.st_dev.major =A0 =A0 =A0 =A0=3D MAJOR(stat->dev);
>> + =A0 =A0 =A0 tmp.st_dev.minor =A0 =A0 =A0 =A0=3D MINOR(stat->dev);
>> + =A0 =A0 =A0 tmp.st_atime.tv_sec =A0 =A0 =3D stat->atime.tv_sec;
>> + =A0 =A0 =A0 tmp.st_atime.tv_nsec =A0 =A0=3D stat->atime.tv_nsec;
>> + =A0 =A0 =A0 tmp.st_mtime.tv_sec =A0 =A0 =3D stat->mtime.tv_sec;
>> + =A0 =A0 =A0 tmp.st_mtime.tv_nsec =A0 =A0=3D stat->mtime.tv_nsec;
>> + =A0 =A0 =A0 tmp.st_ctime.tv_sec =A0 =A0 =3D stat->ctime.tv_sec;
>> + =A0 =A0 =A0 tmp.st_ctime.tv_nsec =A0 =A0=3D stat->ctime.tv_nsec;
>> + =A0 =A0 =A0 tmp.st_ino =A0 =A0 =A0 =A0 =A0 =A0 =A0=3D stat->ino;
>> + =A0 =A0 =A0 tmp.st_size =A0 =A0 =A0 =A0 =A0 =A0 =3D stat->size;
>> + =A0 =A0 =A0 tmp.st_blocks =A0 =A0 =A0 =A0 =A0 =3D stat->blocks;
>> +
>> + =A0 =A0 =A0 if (tmp.st_result_mask & XSTAT_REQUEST_BTIME) {
>> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 tmp.st_btime.tv_sec =A0 =A0 =3D stat->=
btime.tv_sec;
>> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 tmp.st_btime.tv_nsec =A0 =A0=3D stat->=
btime.tv_nsec;
>> + =A0 =A0 =A0 }
>> + =A0 =A0 =A0 if (tmp.st_result_mask & XSTAT_REQUEST_GEN)
>> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 tmp.st_gen =A0 =A0 =A0 =A0 =A0 =A0 =A0=
=3D stat->gen;
>> + =A0 =A0 =A0 if (tmp.st_result_mask & XSTAT_REQUEST_DATA_VERSION)
>> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 tmp.st_data_version =A0 =A0 =3D stat->=
data_version;
>> +
>> + =A0 =A0 =A0 copy =3D sizeof(tmp);
>> + =A0 =A0 =A0 if (copy > bufsize)
>> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 copy =3D bufsize;
>> + =A0 =A0 =A0 if (copy_to_user(buffer, &tmp, copy) !=3D 0)
>> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 return -EFAULT;
>> + =A0 =A0 =A0 return sizeof(tmp);
>> +}
>> +
>> +/*
>> + * System call to get extended stats by path
>> + */
>> +SYSCALL_DEFINE6(xstat,
>> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 int, dfd, const char __user *, filenam=
e, unsigned, atflag,
>> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 struct xstat_parameters __user *, para=
ms,
>> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 struct xstat __user *, buffer, size_t,=
 bufsize)
>> +{
>> + =A0 =A0 =A0 struct kstat stat;
>> + =A0 =A0 =A0 int error;
>> +
>> + =A0 =A0 =A0 error =3D xstat_get_params(params, &stat);
>> + =A0 =A0 =A0 if (error !=3D 0)
>> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 return error;
>> + =A0 =A0 =A0 error =3D vfs_xstat(dfd, filename, atflag, &stat);
>> + =A0 =A0 =A0 if (error)
>> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 return error;
>> + =A0 =A0 =A0 return xstat_set_result(&stat, buffer, bufsize);
>> +}
>> +
>> +/*
>> + * System call to get extended stats by file descriptor
>> + */
>> +SYSCALL_DEFINE5(fxstat, unsigned int, fd, unsigned int, flags,
>> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 struct xstat_parameters __user *, para=
ms,
>> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 struct xstat __user *, buffer, size_t,=
 bufsize)
>> +{
>> + =A0 =A0 =A0 struct kstat stat;
>> + =A0 =A0 =A0 int error;
>> +
>> + =A0 =A0 =A0 error =3D xstat_get_params(params, &stat);
>> + =A0 =A0 =A0 if (error < 0)
>> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 return error;
>> + =A0 =A0 =A0 error =3D vfs_fxstat(fd, flags, &stat);
>> + =A0 =A0 =A0 if (error)
>> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 return error;
>> +
>> + =A0 =A0 =A0 return xstat_set_result(&stat, buffer, bufsize);
>> +}
>> +
>> =A0/* Caller is here responsible for sufficient locking (ie. inode->=
i_lock) */
>> =A0void __inode_add_bytes(struct inode *inode, loff_t bytes)
>> =A0{
>> diff --git a/include/linux/fcntl.h b/include/linux/fcntl.h
>> index afc00af..bcf8083 100644
>> --- a/include/linux/fcntl.h
>> +++ b/include/linux/fcntl.h
>> @@ -45,6 +45,7 @@
>> =A0#define AT_REMOVEDIR =A0 =A0 =A0 =A0 =A0 0x200 =A0 /* Remove dire=
ctory instead of
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =
=A0 =A0 =A0 =A0 =A0unlinking file. =A0*/
>> =A0#define AT_SYMLINK_FOLLOW =A0 =A0 =A00x400 =A0 /* Follow symbolic=
 links. =A0*/
>> +#define AT_FORCE_ATTR_SYNC =A0 =A0 0x800 =A0 /* Force the attribute=
s to be sync'd with the server */
>>
>> =A0#ifdef __KERNEL__
>>
>> diff --git a/include/linux/fs.h b/include/linux/fs.h
>> index a18bcea..9ce2119 100644
>> --- a/include/linux/fs.h
>> +++ b/include/linux/fs.h
>> @@ -2343,6 +2343,8 @@ extern int vfs_stat(const char __user *, struc=
t kstat *);
>> =A0extern int vfs_lstat(const char __user *, struct kstat *);
>> =A0extern int vfs_fstat(unsigned int, struct kstat *);
>> =A0extern int vfs_fstatat(int , const char __user *, struct kstat *,=
 int);
>> +extern int vfs_xstat(int, const char __user *, int, struct kstat *)=
;
>> +extern int vfs_xfstat(unsigned int, struct kstat *);
>>
>> =A0extern int do_vfs_ioctl(struct file *filp, unsigned int fd, unsig=
ned int cmd,
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0unsigned long arg);
>> diff --git a/include/linux/stat.h b/include/linux/stat.h
>> index 611c398..e0b89e4 100644
>> --- a/include/linux/stat.h
>> +++ b/include/linux/stat.h
>> @@ -46,6 +46,99 @@
>>
>> =A0#endif
>>
>> +/*
>> + * Extended stat structures
>> + */
>> +struct xstat_parameters {
>> + =A0 =A0 =A0 /* Query request/result mask
>> + =A0 =A0 =A0 =A0*
>> + =A0 =A0 =A0 =A0* Bits should be set in request_mask to request par=
ticular items
>> + =A0 =A0 =A0 =A0* before calling xstat() or fxstat().
>> + =A0 =A0 =A0 =A0*
>> + =A0 =A0 =A0 =A0* For each item in the set XSTAT_REQUEST__EXTENDED_=
STATS:
>> + =A0 =A0 =A0 =A0*
>> + =A0 =A0 =A0 =A0* - if not available at all, the bit will be cleare=
d before returning
>> + =A0 =A0 =A0 =A0* =A0 and the field will be cleared; otherwise,
>> + =A0 =A0 =A0 =A0*
>> + =A0 =A0 =A0 =A0* - if AT_FORCE_ATTR_SYNC is set, then the datum wi=
ll be synchronised
>> + =A0 =A0 =A0 =A0* =A0 to the server and the bit will be set on retu=
rn; otherwise,
>> + =A0 =A0 =A0 =A0*
>> + =A0 =A0 =A0 =A0* - if requested, the datum will be synchronised to=
 a server or other
>> + =A0 =A0 =A0 =A0* =A0 hardware if out of date before being returned=
, and the bit will be
>> + =A0 =A0 =A0 =A0* =A0 set on return; otherwise,
>> + =A0 =A0 =A0 =A0*
>> + =A0 =A0 =A0 =A0* - if not requested, but available in approximate =
form without any
>> + =A0 =A0 =A0 =A0* =A0 effort, it will be filled in anyway, and the =
bit will be set upon
>> + =A0 =A0 =A0 =A0* =A0 return (it might not be up to date, however, =
and no attempt will
>> + =A0 =A0 =A0 =A0* =A0 be made to synchronise the internal state fir=
st); otherwise,
>> + =A0 =A0 =A0 =A0*
>> + =A0 =A0 =A0 =A0* - the bit will be cleared before returning, and t=
he field will be
>> + =A0 =A0 =A0 =A0 * =A0 cleared.
>> + =A0 =A0 =A0 =A0*
>> + =A0 =A0 =A0 =A0* For each item not in the set XSTAT_REQUEST__EXTEN=
DED_STATS
>> + =A0 =A0 =A0 =A0*
>> + =A0 =A0 =A0 =A0* - if not available at all, the bit will be cleare=
d, and no result
>> + =A0 =A0 =A0 =A0 * =A0 data will be returned; otherwise,
>> + =A0 =A0 =A0 =A0*
>> + =A0 =A0 =A0 =A0* - if requested, the datum will be synchronised to=
 a server or other
>> + =A0 =A0 =A0 =A0* =A0 hardware before being appended if necessary, =
and the bit will be
>> + =A0 =A0 =A0 =A0* =A0 set on return; otherwise,
>> + =A0 =A0 =A0 =A0*
>> + =A0 =A0 =A0 =A0* - the bit will be cleared, and no result data wil=
l be returned.
>> + =A0 =A0 =A0 =A0*
>> + =A0 =A0 =A0 =A0* Items in XSTAT_REQUEST__BASIC_STATS may be marked=
 unavailable on
>> + =A0 =A0 =A0 =A0* return, but they will have a value installed for =
compatibility
>> + =A0 =A0 =A0 =A0* purposes.
>> + =A0 =A0 =A0 =A0*/
>> + =A0 =A0 =A0 unsigned long long =A0 =A0 =A0request_mask;
>> +#define XSTAT_REQUEST_MODE =A0 =A0 =A0 =A0 =A0 =A0 0x00000001ULL =A0=
 /* want/got st_mode */
>> +#define XSTAT_REQUEST_NLINK =A0 =A0 =A0 =A0 =A0 =A00x00000002ULL =A0=
 /* want/got st_nlink */
>> +#define XSTAT_REQUEST_UID =A0 =A0 =A0 =A0 =A0 =A0 =A00x00000004ULL =
=A0 /* want/got st_uid */
>> +#define XSTAT_REQUEST_GID =A0 =A0 =A0 =A0 =A0 =A0 =A00x00000008ULL =
=A0 /* want/got st_gid */
>> +#define XSTAT_REQUEST_RDEV =A0 =A0 =A0 =A0 =A0 =A0 0x00000010ULL =A0=
 /* want/got st_rdev */
>> +#define XSTAT_REQUEST_ATIME =A0 =A0 =A0 =A0 =A0 =A00x00000020ULL =A0=
 /* want/got st_atime */
>> +#define XSTAT_REQUEST_MTIME =A0 =A0 =A0 =A0 =A0 =A00x00000040ULL =A0=
 /* want/got st_mtime */
>> +#define XSTAT_REQUEST_CTIME =A0 =A0 =A0 =A0 =A0 =A00x00000080ULL =A0=
 /* want/got st_ctime */
>> +#define XSTAT_REQUEST_INO =A0 =A0 =A0 =A0 =A0 =A0 =A00x00000100ULL =
=A0 /* want/got st_ino */
>> +#define XSTAT_REQUEST_SIZE =A0 =A0 =A0 =A0 =A0 =A0 0x00000200ULL =A0=
 /* want/got st_size */
>> +#define XSTAT_REQUEST_BLOCKS =A0 =A0 =A0 =A0 =A0 0x00000400ULL =A0 =
/* want/got st_blocks */
>> +#define XSTAT_REQUEST__BASIC_STATS =A0 =A0 0x000007ffULL =A0 /* the=
 stuff in the normal stat struct */
>> +#define XSTAT_REQUEST_BTIME =A0 =A0 =A0 =A0 =A0 =A00x00000800ULL =A0=
 /* want/got st_btime */
>> +#define XSTAT_REQUEST_GEN =A0 =A0 =A0 =A0 =A0 =A0 =A00x00001000ULL =
=A0 /* want/got st_gen */
>> +#define XSTAT_REQUEST_DATA_VERSION =A0 =A0 0x00002000ULL =A0 /* wan=
t/got st_data_version */
>> +#define XSTAT_REQUEST__EXTENDED_STATS =A00x00003fffULL =A0 /* the s=
tuff in the xstat struct */
>> +#define XSTAT_REQUEST__ALL_STATS =A0 =A0 =A0 0x00003fffULL =A0 /* t=
he defined set of requestables */
>> +};
>> +
>> +struct xstat_dev {
>> + =A0 =A0 =A0 unsigned int =A0 =A0 =A0 =A0 =A0 =A0major, minor;
>> +};
>> +
>> +struct xstat_time {
>> + =A0 =A0 =A0 unsigned long long =A0 =A0 =A0tv_sec, tv_nsec;
>> +};
>> +
>> +struct xstat {
>> + =A0 =A0 =A0 unsigned int =A0 =A0 =A0 =A0 =A0 =A0st_mode; =A0 =A0 =A0=
 =A0/* file mode */
>> + =A0 =A0 =A0 unsigned int =A0 =A0 =A0 =A0 =A0 =A0st_nlink; =A0 =A0 =
=A0 /* number of hard links */
>> + =A0 =A0 =A0 unsigned int =A0 =A0 =A0 =A0 =A0 =A0st_uid; =A0 =A0 =A0=
 =A0 /* user ID of owner */
>> + =A0 =A0 =A0 unsigned int =A0 =A0 =A0 =A0 =A0 =A0st_gid; =A0 =A0 =A0=
 =A0 /* group ID of owner */
>> + =A0 =A0 =A0 struct xstat_dev =A0 =A0 =A0 =A0st_rdev; =A0 =A0 =A0 =A0=
/* device ID of special file */
>> + =A0 =A0 =A0 struct xstat_dev =A0 =A0 =A0 =A0st_dev; =A0 =A0 =A0 =A0=
 /* ID of device containing file */
>> + =A0 =A0 =A0 struct xstat_time =A0 =A0 =A0 st_atime; =A0 =A0 =A0 /*=
 last access time */
>> + =A0 =A0 =A0 struct xstat_time =A0 =A0 =A0 st_mtime; =A0 =A0 =A0 /*=
 last data modification time */
>> + =A0 =A0 =A0 struct xstat_time =A0 =A0 =A0 st_ctime; =A0 =A0 =A0 /*=
 last attribute change time */
>> + =A0 =A0 =A0 struct xstat_time =A0 =A0 =A0 st_btime; =A0 =A0 =A0 /*=
 file creation time */
>> + =A0 =A0 =A0 unsigned long long =A0 =A0 =A0st_ino; =A0 =A0 =A0 =A0 =
/* inode number */
>> + =A0 =A0 =A0 unsigned long long =A0 =A0 =A0st_size; =A0 =A0 =A0 =A0=
/* file size */
>> + =A0 =A0 =A0 unsigned long long =A0 =A0 =A0st_blksize; =A0 =A0 /* b=
lock size for filesystem I/O */
>> + =A0 =A0 =A0 unsigned long long =A0 =A0 =A0st_blocks; =A0 =A0 =A0/*=
 number of 512-byte blocks allocated */
>> + =A0 =A0 =A0 unsigned long long =A0 =A0 =A0st_gen; =A0 =A0 =A0 =A0 =
/* inode generation number */
>> + =A0 =A0 =A0 unsigned long long =A0 =A0 =A0st_data_version; /* data=
 version number */
>> + =A0 =A0 =A0 unsigned long long =A0 =A0 =A0st_result_mask; /* what =
requests were written */
>> + =A0 =A0 =A0 unsigned long long =A0 =A0 =A0st_extra_results[0]; /* =
extra requested results */
>> +};
>> +
>> =A0#ifdef __KERNEL__
>> =A0#define S_IRWXUGO =A0 =A0 =A0(S_IRWXU|S_IRWXG|S_IRWXO)
>> =A0#define S_IALLUGO =A0 =A0 =A0(S_ISUID|S_ISGID|S_ISVTX|S_IRWXUGO)
>> @@ -67,14 +160,20 @@ struct kstat {
>> =A0 =A0 =A0 =A0uid_t =A0 =A0 =A0 =A0 =A0 uid;
>> =A0 =A0 =A0 =A0gid_t =A0 =A0 =A0 =A0 =A0 gid;
>> =A0 =A0 =A0 =A0dev_t =A0 =A0 =A0 =A0 =A0 rdev;
>> + =A0 =A0 =A0 unsigned int =A0 =A0query_flags; =A0 =A0 =A0 =A0 =A0 =A0=
/* operational flags */
>> +#define KSTAT_QUERY_FLAGS (AT_FORCE_ATTR_SYNC)
>> =A0 =A0 =A0 =A0loff_t =A0 =A0 =A0 =A0 =A0size;
>> - =A0 =A0 =A0 struct timespec =A0atime;
>> + =A0 =A0 =A0 struct timespec atime;
>> =A0 =A0 =A0 =A0struct timespec mtime;
>> =A0 =A0 =A0 =A0struct timespec ctime;
>> + =A0 =A0 =A0 struct timespec btime; =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0=
 =A0/* file creation time */
>> =A0 =A0 =A0 =A0unsigned long =A0 blksize;
>> =A0 =A0 =A0 =A0unsigned long long =A0 =A0 =A0blocks;
>> + =A0 =A0 =A0 u64 =A0 =A0 =A0 =A0 =A0 =A0 request_mask; =A0 =A0 =A0 =
=A0 =A0 /* what fields the user asked for */
>> + =A0 =A0 =A0 u64 =A0 =A0 =A0 =A0 =A0 =A0 result_mask; =A0 =A0 =A0 =A0=
 =A0 =A0/* what fields the user got */
>> + =A0 =A0 =A0 u64 =A0 =A0 =A0 =A0 =A0 =A0 gen; =A0 =A0 =A0 =A0 =A0 =A0=
 =A0 =A0 =A0 =A0/* inode generation */
>> + =A0 =A0 =A0 u64 =A0 =A0 =A0 =A0 =A0 =A0 data_version;
>> =A0};
>>
>> =A0#endif
>> -
>> =A0#endif
>> diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
>> index 8812a63..5d68b4c 100644
>> --- a/include/linux/syscalls.h
>> +++ b/include/linux/syscalls.h
>> @@ -44,6 +44,8 @@ struct shmid_ds;
>> =A0struct sockaddr;
>> =A0struct stat;
>> =A0struct stat64;
>> +struct xstat_parameters;
>> +struct xstat;
>> =A0struct statfs;
>> =A0struct statfs64;
>> =A0struct __sysctl_args;
>> @@ -824,4 +826,11 @@ asmlinkage long sys_mmap_pgoff(unsigned long ad=
dr, unsigned long len,
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0unsigned long fd, uns=
igned long pgoff);
>> =A0asmlinkage long sys_old_mmap(struct mmap_arg_struct __user *arg);
>>
>> +asmlinkage long sys_xstat(int, const char __user *, unsigned,
>> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 struct xstat_param=
eters __user *,
>> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 struct xstat __use=
r *, size_t);
>> +asmlinkage long sys_fxstat(unsigned, unsigned,
>> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0struct xstat_pa=
rameters __user *,
>> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0struct xstat __=
user *, size_t);
>> +
>> =A0#endif
>>
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-fsde=
vel" in
>> the body of a message to majordomo@vger.kernel.org
>> More majordomo info at =A0http://vger.kernel.org/majordomo-info.html
>>
>
>
>
> --
> Michael Kerrisk Linux man-pages maintainer;
> http://www.kernel.org/doc/man-pages/
> Author of "The Linux Programming Interface", http://blog.man7.org/
> --
> To unsubscribe from this list: send the line "unsubscribe linux-api" =
in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at =A0http://vger.kernel.org/majordomo-info.html
>



--=20
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Author of "The Linux Programming Interface" http://blog.man7.org/
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