On Tue, Sep 15, 2015 at 11:59:22AM +0200, Jan Tulak wrote:
> For what fsr needs, mntinfo can be used instead of mntent.
> Custom mntent struct is used to avoid too big ifdefs:
> We only change few lines and the rest of the code can still
> use mntent as before.
>
> Signed-off-by: Jan Tulak <jtulak@xxxxxxxxxx>
> ---
> fsr/Makefile | 8 +++++++
> fsr/xfs_fsr.c | 69 ++++++++++++++++++++++++++++++++++++++++++++++++--------
> include/darwin.h | 20 ++++++++++++++++
> 3 files changed, 87 insertions(+), 10 deletions(-)
>
> diff --git a/fsr/Makefile b/fsr/Makefile
> index a9d1bf6..d3521b2 100644
> --- a/fsr/Makefile
> +++ b/fsr/Makefile
> @@ -9,6 +9,14 @@ LTCOMMAND = xfs_fsr
> CFILES = xfs_fsr.c
> LLDLIBS = $(LIBHANDLE)
>
> +ifeq ($(HAVE_GETMNTENT),yes)
> +LCFLAGS += -DHAVE_GETMNTENT
> +endif
> +
> +ifeq ($(HAVE_GETMNTINFO),yes)
> +LCFLAGS += -DHAVE_GETMNTINFO
> +endif
> +
> default: depend $(LTCOMMAND)
>
> include $(BUILDRULES)
> diff --git a/fsr/xfs_fsr.c b/fsr/xfs_fsr.c
> index 5f95cdc..ff791d3 100644
> --- a/fsr/xfs_fsr.c
> +++ b/fsr/xfs_fsr.c
> @@ -32,8 +32,10 @@
> #include <sys/statvfs.h>
> #include <sys/xattr.h>
>
> -#ifdef HAVE_MNTENT
> +#if defined(HAVE_GETMNTENT)
> # include <mntent.h>
> +#elif defined(HAVE_GETMNTINFO)
> +# include <sys/mount.h>
> #endif
>
> #ifdef __APPLE__
> @@ -191,9 +193,10 @@ find_mountpoint(char *mtab, char *argname, struct stat64 *sb)
> {
> struct mntent *t;
> struct stat64 ms;
> - FILE *mtabp;
> char *mntp = NULL;
>
> +#if defined(HAVE_GETMNTENT)
> + FILE *mtabp;
> mtabp = setmntent(mtab, "r");
> if (!mtabp) {
> fprintf(stderr, _("%s: cannot read %s\n"),
> @@ -202,6 +205,27 @@ find_mountpoint(char *mtab, char *argname, struct stat64 *sb)
> }
>
> while ((t = getmntent(mtabp))) {
> +#elif defined(HAVE_GETMNTINFO)
> + struct statfs *stats;
> + int error, i, count;
> + // because "t" is a pointer, but we don't need to use
> + // malloc for this usage
> + struct mntent t_tmp;
> + t = &t_tmp;
> +
> +
> + error = 0;
> + if ((count = getmntinfo(&stats, 0)) < 0) {
> + fprintf(stderr, _("%s: getmntinfo() failed: %s\n"),
> + progname, strerror(errno));
> + return 0;
> + }
> +
> + for (i = 0; i < count; i++) {
> + mntinfo2mntent(&stats[i], t);
> +#else
> +# error "How do I extract info about mounted filesystems on this platform?"
> +#endif
No, please don't do that. Having a loop iterator split across two
separate defines is unmaintainable. Write two separate functions
with the different loop iterators, then factor the common bit out
of them into a single function.
> /* find all rw xfs file systems */
> mi = 0;
> fs = fsbase;
> +
> +#if defined(HAVE_GETMNTENT)
> + FILE *fp;
> + fp = setmntent(mtab, "r");
> + if (fp == NULL) {
> + fsrprintf(_("could not open mtab file: %s\n"), mtab);
> + exit(1);
> + }
> +
> while ((mp = getmntent(fp))) {
> +#elif defined(HAVE_GETMNTINFO)
> + struct statfs *stats;
> + int error, i, count;
> + // because "t" is a pointer, but we don't need to use
> + // malloc for this usage
> + struct mntent mp_tmp;
> + mp = &mp_tmp;
> + error = 0;
> + if ((count = getmntinfo(&stats, 0)) < 0) {
> + fprintf(stderr, _("%s: getmntinfo() failed: %s\n"),
> + progname, strerror(errno));
> + exit(1);
> + }
> +
> + for (i = 0; i < count; i++) {
> + mntinfo2mntent(&stats[i], mp);
> +#else
> +# error "How do I extract info about mounted filesystems on this platform?"
> +#endif
> +
Same again here.
--
Dave Chinner
david@xxxxxxxxxxxxx
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