diff mbox series

[v1,3/3] xfs_io: Add RWF_DONTCACHE support to preadv2

Message ID 19402a5e05c2d1c55e794119facffaec3204a48d.1741087191.git.ritesh.list@gmail.com (mailing list archive)
State New
Headers show
Series xfsprogs: Add support for preadv2() and RWF_DONTCACHE | expand

Commit Message

Ritesh Harjani (IBM) March 4, 2025, 11:55 a.m. UTC 
Add per-io RWF_DONTCACHE support flag to preadv2()
This enables xfs_io to perform buffered-io read which can drop the page
cache folios after reading.

	e.g. xfs_io -c "pread -U -V 1 0 16K" /mnt/f1

Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
---
 io/pread.c        | 12 ++++++++++--
 man/man8/xfs_io.8 |  8 +++++++-
 2 files changed, 17 insertions(+), 3 deletions(-)

Comments

Darrick J. Wong March 4, 2025, 5:53 p.m. UTC | #1 
On Tue, Mar 04, 2025 at 05:25:37PM +0530, Ritesh Harjani (IBM) wrote:
> Add per-io RWF_DONTCACHE support flag to preadv2()
> This enables xfs_io to perform buffered-io read which can drop the page
> cache folios after reading.
> 
> 	e.g. xfs_io -c "pread -U -V 1 0 16K" /mnt/f1
> 
> Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
> ---
>  io/pread.c        | 12 ++++++++++--
>  man/man8/xfs_io.8 |  8 +++++++-
>  2 files changed, 17 insertions(+), 3 deletions(-)
> 
> diff --git a/io/pread.c b/io/pread.c
> index 782f2a36..64c28784 100644
> --- a/io/pread.c
> +++ b/io/pread.c
> @@ -38,6 +38,9 @@ pread_help(void)
>  " -Z N -- zeed the random number generator (used when reading randomly)\n"
>  "         (heh, zorry, the -s/-S arguments were already in use in pwrite)\n"
>  " -V N -- use vectored IO with N iovecs of blocksize each (preadv)\n"
> +#ifdef HAVE_PWRITEV2

HAVE_PREADV2?

--D

> +" -U   -- Perform the preadv2() with Uncached/RWF_DONTCACHE\n"
> +#endif
>  "\n"
>  " When in \"random\" mode, the number of read operations will equal the\n"
>  " number required to do a complete forward/backward scan of the range.\n"
> @@ -388,7 +391,7 @@ pread_f(
>  	init_cvtnum(&fsblocksize, &fssectsize);
>  	bsize = fsblocksize;
>  
> -	while ((c = getopt(argc, argv, "b:BCFRquvV:Z:")) != EOF) {
> +	while ((c = getopt(argc, argv, "b:BCFRquUvV:Z:")) != EOF) {
>  		switch (c) {
>  		case 'b':
>  			tmp = cvtnum(fsblocksize, fssectsize, optarg);
> @@ -417,6 +420,11 @@ pread_f(
>  		case 'u':
>  			uflag = 1;
>  			break;
> +#ifdef HAVE_PREADV2
> +		case 'U':
> +			preadv2_flags |= RWF_DONTCACHE;
> +			break;
> +#endif
>  		case 'v':
>  			vflag = 1;
>  			break;
> @@ -514,7 +522,7 @@ pread_init(void)
>  	pread_cmd.argmin = 2;
>  	pread_cmd.argmax = -1;
>  	pread_cmd.flags = CMD_NOMAP_OK | CMD_FOREIGN_OK;
> -	pread_cmd.args = _("[-b bs] [-qv] [-i N] [-FBR [-Z N]] off len");
> +	pread_cmd.args = _("[-b bs] [-qUv] [-i N] [-FBR [-Z N]] off len");
>  	pread_cmd.oneline = _("reads a number of bytes at a specified offset");
>  	pread_cmd.help = pread_help;
>  
> diff --git a/man/man8/xfs_io.8 b/man/man8/xfs_io.8
> index 47af5232..df508054 100644
> --- a/man/man8/xfs_io.8
> +++ b/man/man8/xfs_io.8
> @@ -200,7 +200,7 @@ option will set the file permissions to read-write (0644). This allows xfs_io to
>  set up mismatches between the file permissions and the open file descriptor
>  read/write mode to exercise permission checks inside various syscalls.
>  .TP
> -.BI "pread [ \-b " bsize " ] [ \-qv ] [ \-FBR [ \-Z " seed " ] ] [ \-V " vectors " ] " "offset length"
> +.BI "pread [ \-b " bsize " ] [ \-qUv ] [ \-FBR [ \-Z " seed " ] ] [ \-V " vectors " ] " "offset length"
>  Reads a range of bytes in a specified blocksize from the given
>  .IR offset .
>  .RS 1.0i
> @@ -214,6 +214,12 @@ requests will be split. The default blocksize is 4096 bytes.
>  .B \-q
>  quiet mode, do not write anything to standard output.
>  .TP
> +.B \-U
> +Perform the
> +.BR preadv2 (2)
> +call with
> +.IR RWF_DONTCACHE .
> +.TP
>  .B \-v
>  dump the contents of the buffer after reading,
>  by default only the count of bytes actually read is dumped.
> -- 
> 2.48.1
> 
>
Ritesh Harjani (IBM) March 5, 2025, 1:30 a.m. UTC | #2 
"Darrick J. Wong" <djwong@kernel.org> writes:

> On Tue, Mar 04, 2025 at 05:25:37PM +0530, Ritesh Harjani (IBM) wrote:
>> Add per-io RWF_DONTCACHE support flag to preadv2()
>> This enables xfs_io to perform buffered-io read which can drop the page
>> cache folios after reading.
>> 
>> 	e.g. xfs_io -c "pread -U -V 1 0 16K" /mnt/f1
>> 
>> Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
>> ---
>>  io/pread.c        | 12 ++++++++++--
>>  man/man8/xfs_io.8 |  8 +++++++-
>>  2 files changed, 17 insertions(+), 3 deletions(-)
>> 
>> diff --git a/io/pread.c b/io/pread.c
>> index 782f2a36..64c28784 100644
>> --- a/io/pread.c
>> +++ b/io/pread.c
>> @@ -38,6 +38,9 @@ pread_help(void)
>>  " -Z N -- zeed the random number generator (used when reading randomly)\n"
>>  "         (heh, zorry, the -s/-S arguments were already in use in pwrite)\n"
>>  " -V N -- use vectored IO with N iovecs of blocksize each (preadv)\n"
>> +#ifdef HAVE_PWRITEV2
>
> HAVE_PREADV2?
>

Thanks for catching that. Will fix this in v2.

-ritesh

> --D
>
>> +" -U   -- Perform the preadv2() with Uncached/RWF_DONTCACHE\n"
>> +#endif
>>  "\n"
>>  " When in \"random\" mode, the number of read operations will equal the\n"
>>  " number required to do a complete forward/backward scan of the range.\n"
>> @@ -388,7 +391,7 @@ pread_f(
>>  	init_cvtnum(&fsblocksize, &fssectsize);
>>  	bsize = fsblocksize;
>>  
>> -	while ((c = getopt(argc, argv, "b:BCFRquvV:Z:")) != EOF) {
>> +	while ((c = getopt(argc, argv, "b:BCFRquUvV:Z:")) != EOF) {
>>  		switch (c) {
>>  		case 'b':
>>  			tmp = cvtnum(fsblocksize, fssectsize, optarg);
>> @@ -417,6 +420,11 @@ pread_f(
>>  		case 'u':
>>  			uflag = 1;
>>  			break;
>> +#ifdef HAVE_PREADV2
>> +		case 'U':
>> +			preadv2_flags |= RWF_DONTCACHE;
>> +			break;
>> +#endif
>>  		case 'v':
>>  			vflag = 1;
>>  			break;
>> @@ -514,7 +522,7 @@ pread_init(void)
>>  	pread_cmd.argmin = 2;
>>  	pread_cmd.argmax = -1;
>>  	pread_cmd.flags = CMD_NOMAP_OK | CMD_FOREIGN_OK;
>> -	pread_cmd.args = _("[-b bs] [-qv] [-i N] [-FBR [-Z N]] off len");
>> +	pread_cmd.args = _("[-b bs] [-qUv] [-i N] [-FBR [-Z N]] off len");
>>  	pread_cmd.oneline = _("reads a number of bytes at a specified offset");
>>  	pread_cmd.help = pread_help;
>>  
>> diff --git a/man/man8/xfs_io.8 b/man/man8/xfs_io.8
>> index 47af5232..df508054 100644
>> --- a/man/man8/xfs_io.8
>> +++ b/man/man8/xfs_io.8
>> @@ -200,7 +200,7 @@ option will set the file permissions to read-write (0644). This allows xfs_io to
>>  set up mismatches between the file permissions and the open file descriptor
>>  read/write mode to exercise permission checks inside various syscalls.
>>  .TP
>> -.BI "pread [ \-b " bsize " ] [ \-qv ] [ \-FBR [ \-Z " seed " ] ] [ \-V " vectors " ] " "offset length"
>> +.BI "pread [ \-b " bsize " ] [ \-qUv ] [ \-FBR [ \-Z " seed " ] ] [ \-V " vectors " ] " "offset length"
>>  Reads a range of bytes in a specified blocksize from the given
>>  .IR offset .
>>  .RS 1.0i
>> @@ -214,6 +214,12 @@ requests will be split. The default blocksize is 4096 bytes.
>>  .B \-q
>>  quiet mode, do not write anything to standard output.
>>  .TP
>> +.B \-U
>> +Perform the
>> +.BR preadv2 (2)
>> +call with
>> +.IR RWF_DONTCACHE .
>> +.TP
>>  .B \-v
>>  dump the contents of the buffer after reading,
>>  by default only the count of bytes actually read is dumped.
>> -- 
>> 2.48.1
>> 
>>
diff mbox series

Patch

diff --git a/io/pread.c b/io/pread.c
index 782f2a36..64c28784 100644
--- a/io/pread.c
+++ b/io/pread.c
@@ -38,6 +38,9 @@  pread_help(void)
 " -Z N -- zeed the random number generator (used when reading randomly)\n"
 "         (heh, zorry, the -s/-S arguments were already in use in pwrite)\n"
 " -V N -- use vectored IO with N iovecs of blocksize each (preadv)\n"
+#ifdef HAVE_PWRITEV2
+" -U   -- Perform the preadv2() with Uncached/RWF_DONTCACHE\n"
+#endif
 "\n"
 " When in \"random\" mode, the number of read operations will equal the\n"
 " number required to do a complete forward/backward scan of the range.\n"
@@ -388,7 +391,7 @@  pread_f(
 	init_cvtnum(&fsblocksize, &fssectsize);
 	bsize = fsblocksize;
 
-	while ((c = getopt(argc, argv, "b:BCFRquvV:Z:")) != EOF) {
+	while ((c = getopt(argc, argv, "b:BCFRquUvV:Z:")) != EOF) {
 		switch (c) {
 		case 'b':
 			tmp = cvtnum(fsblocksize, fssectsize, optarg);
@@ -417,6 +420,11 @@  pread_f(
 		case 'u':
 			uflag = 1;
 			break;
+#ifdef HAVE_PREADV2
+		case 'U':
+			preadv2_flags |= RWF_DONTCACHE;
+			break;
+#endif
 		case 'v':
 			vflag = 1;
 			break;
@@ -514,7 +522,7 @@  pread_init(void)
 	pread_cmd.argmin = 2;
 	pread_cmd.argmax = -1;
 	pread_cmd.flags = CMD_NOMAP_OK | CMD_FOREIGN_OK;
-	pread_cmd.args = _("[-b bs] [-qv] [-i N] [-FBR [-Z N]] off len");
+	pread_cmd.args = _("[-b bs] [-qUv] [-i N] [-FBR [-Z N]] off len");
 	pread_cmd.oneline = _("reads a number of bytes at a specified offset");
 	pread_cmd.help = pread_help;
 
diff --git a/man/man8/xfs_io.8 b/man/man8/xfs_io.8
index 47af5232..df508054 100644
--- a/man/man8/xfs_io.8
+++ b/man/man8/xfs_io.8
@@ -200,7 +200,7 @@  option will set the file permissions to read-write (0644). This allows xfs_io to
 set up mismatches between the file permissions and the open file descriptor
 read/write mode to exercise permission checks inside various syscalls.
 .TP
-.BI "pread [ \-b " bsize " ] [ \-qv ] [ \-FBR [ \-Z " seed " ] ] [ \-V " vectors " ] " "offset length"
+.BI "pread [ \-b " bsize " ] [ \-qUv ] [ \-FBR [ \-Z " seed " ] ] [ \-V " vectors " ] " "offset length"
 Reads a range of bytes in a specified blocksize from the given
 .IR offset .
 .RS 1.0i
@@ -214,6 +214,12 @@  requests will be split. The default blocksize is 4096 bytes.
 .B \-q
 quiet mode, do not write anything to standard output.
 .TP
+.B \-U
+Perform the
+.BR preadv2 (2)
+call with
+.IR RWF_DONTCACHE .
+.TP
 .B \-v
 dump the contents of the buffer after reading,
 by default only the count of bytes actually read is dumped.