diff mbox series

[09/11] libfrog: clean up platform_nproc

Message ID 156944742224.300131.10235357474710122535.stgit@magnolia (mailing list archive)
State Superseded
Headers show
Series xfs_scrub: fix IO error reporting | expand

Commit Message

Darrick J. Wong Sept. 25, 2019, 9:37 p.m. UTC 
From: Darrick J. Wong <darrick.wong@oracle.com>

The platform_nproc function should check for error returns and obviously
garbage values and deal with them appropriately.  Fix the header
declaration since it's part of the libfrog platform support code, not
libxfs.  xfs_scrub will make use of it in the next patch.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
---
 include/libxfs.h           |    1 -
 include/platform_defs.h.in |    2 ++
 libfrog/linux.c            |    9 ++++++++-
 3 files changed, 10 insertions(+), 2 deletions(-)

Comments

Eric Sandeen Oct. 21, 2019, 7:31 p.m. UTC | #1 
On 9/25/19 4:37 PM, Darrick J. Wong wrote:
> From: Darrick J. Wong <darrick.wong@oracle.com>
> 
> The platform_nproc function should check for error returns and obviously
> garbage values and deal with them appropriately.  Fix the header
> declaration since it's part of the libfrog platform support code, not
> libxfs.  xfs_scrub will make use of it in the next patch.
> 
> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
> ---
>  include/libxfs.h           |    1 -
>  include/platform_defs.h.in |    2 ++
>  libfrog/linux.c            |    9 ++++++++-
>  3 files changed, 10 insertions(+), 2 deletions(-)
> 
> 
> diff --git a/include/libxfs.h b/include/libxfs.h
> index 63696df5..227084ae 100644
> --- a/include/libxfs.h
> +++ b/include/libxfs.h
> @@ -135,7 +135,6 @@ extern void	libxfs_device_close (dev_t);
>  extern int	libxfs_device_alignment (void);
>  extern void	libxfs_report(FILE *);
>  extern void	platform_findsizes(char *path, int fd, long long *sz, int *bsz);
> -extern int	platform_nproc(void);
>  
>  /* check or write log footer: specify device, log size in blocks & uuid */
>  typedef char	*(libxfs_get_block_t)(char *, int, void *);
> diff --git a/include/platform_defs.h.in b/include/platform_defs.h.in
> index d111ec6d..adb00181 100644
> --- a/include/platform_defs.h.in
> +++ b/include/platform_defs.h.in
> @@ -77,4 +77,6 @@ typedef unsigned short umode_t;
>  # define ASSERT(EX)	((void) 0)
>  #endif
>  
> +extern int	platform_nproc(void);
> +
>  #endif	/* __XFS_PLATFORM_DEFS_H__ */
> diff --git a/libfrog/linux.c b/libfrog/linux.c
> index b6c24879..79bd79eb 100644
> --- a/libfrog/linux.c
> +++ b/libfrog/linux.c
> @@ -242,10 +242,17 @@ platform_align_blockdev(void)
>  	return max_block_alignment;
>  }
>  
> +/* How many CPUs are online? */
>  int
>  platform_nproc(void)
>  {
> -	return sysconf(_SC_NPROCESSORS_ONLN);
> +	long nproc = sysconf(_SC_NPROCESSORS_ONLN);
> +
> +	if (nproc < 1)
> +		return 1;
> +	if (nproc >= INT_MAX)
> +		return INT_MAX;
> +	return nproc;
>  }

hm, may as well remove the test from libxfs then?

int
libxfs_nproc(void)
{
        int     nr;

        nr = platform_nproc();
        if (nr < 1)
                nr = 1;
        return nr;
}
Darrick J. Wong Oct. 21, 2019, 8:13 p.m. UTC | #2 
On Mon, Oct 21, 2019 at 02:31:52PM -0500, Eric Sandeen wrote:
> On 9/25/19 4:37 PM, Darrick J. Wong wrote:
> > From: Darrick J. Wong <darrick.wong@oracle.com>
> > 
> > The platform_nproc function should check for error returns and obviously
> > garbage values and deal with them appropriately.  Fix the header
> > declaration since it's part of the libfrog platform support code, not
> > libxfs.  xfs_scrub will make use of it in the next patch.
> > 
> > Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
> > ---
> >  include/libxfs.h           |    1 -
> >  include/platform_defs.h.in |    2 ++
> >  libfrog/linux.c            |    9 ++++++++-
> >  3 files changed, 10 insertions(+), 2 deletions(-)
> > 
> > 
> > diff --git a/include/libxfs.h b/include/libxfs.h
> > index 63696df5..227084ae 100644
> > --- a/include/libxfs.h
> > +++ b/include/libxfs.h
> > @@ -135,7 +135,6 @@ extern void	libxfs_device_close (dev_t);
> >  extern int	libxfs_device_alignment (void);
> >  extern void	libxfs_report(FILE *);
> >  extern void	platform_findsizes(char *path, int fd, long long *sz, int *bsz);
> > -extern int	platform_nproc(void);
> >  
> >  /* check or write log footer: specify device, log size in blocks & uuid */
> >  typedef char	*(libxfs_get_block_t)(char *, int, void *);
> > diff --git a/include/platform_defs.h.in b/include/platform_defs.h.in
> > index d111ec6d..adb00181 100644
> > --- a/include/platform_defs.h.in
> > +++ b/include/platform_defs.h.in
> > @@ -77,4 +77,6 @@ typedef unsigned short umode_t;
> >  # define ASSERT(EX)	((void) 0)
> >  #endif
> >  
> > +extern int	platform_nproc(void);
> > +
> >  #endif	/* __XFS_PLATFORM_DEFS_H__ */
> > diff --git a/libfrog/linux.c b/libfrog/linux.c
> > index b6c24879..79bd79eb 100644
> > --- a/libfrog/linux.c
> > +++ b/libfrog/linux.c
> > @@ -242,10 +242,17 @@ platform_align_blockdev(void)
> >  	return max_block_alignment;
> >  }
> >  
> > +/* How many CPUs are online? */
> >  int
> >  platform_nproc(void)
> >  {
> > -	return sysconf(_SC_NPROCESSORS_ONLN);
> > +	long nproc = sysconf(_SC_NPROCESSORS_ONLN);
> > +
> > +	if (nproc < 1)
> > +		return 1;
> > +	if (nproc >= INT_MAX)
> > +		return INT_MAX;
> > +	return nproc;
> >  }
> 
> hm, may as well remove the test from libxfs then?
> 
> int
> libxfs_nproc(void)
> {
>         int     nr;
> 
>         nr = platform_nproc();
>         if (nr < 1)
>                 nr = 1;
>         return nr;
> }

Eh, I'll just remove libxfs_nproc since it's now just a shallow wrapper
to another library.

--D
diff mbox series

Patch

diff --git a/include/libxfs.h b/include/libxfs.h
index 63696df5..227084ae 100644
--- a/include/libxfs.h
+++ b/include/libxfs.h
@@ -135,7 +135,6 @@  extern void	libxfs_device_close (dev_t);
 extern int	libxfs_device_alignment (void);
 extern void	libxfs_report(FILE *);
 extern void	platform_findsizes(char *path, int fd, long long *sz, int *bsz);
-extern int	platform_nproc(void);
 
 /* check or write log footer: specify device, log size in blocks & uuid */
 typedef char	*(libxfs_get_block_t)(char *, int, void *);
diff --git a/include/platform_defs.h.in b/include/platform_defs.h.in
index d111ec6d..adb00181 100644
--- a/include/platform_defs.h.in
+++ b/include/platform_defs.h.in
@@ -77,4 +77,6 @@  typedef unsigned short umode_t;
 # define ASSERT(EX)	((void) 0)
 #endif
 
+extern int	platform_nproc(void);
+
 #endif	/* __XFS_PLATFORM_DEFS_H__ */
diff --git a/libfrog/linux.c b/libfrog/linux.c
index b6c24879..79bd79eb 100644
--- a/libfrog/linux.c
+++ b/libfrog/linux.c
@@ -242,10 +242,17 @@  platform_align_blockdev(void)
 	return max_block_alignment;
 }
 
+/* How many CPUs are online? */
 int
 platform_nproc(void)
 {
-	return sysconf(_SC_NPROCESSORS_ONLN);
+	long nproc = sysconf(_SC_NPROCESSORS_ONLN);
+
+	if (nproc < 1)
+		return 1;
+	if (nproc >= INT_MAX)
+		return INT_MAX;
+	return nproc;
 }
 
 unsigned long