On Tue, 2019-09-17 at 08:10 -0400, Brian Foster wrote:
> On Tue, Sep 17, 2019 at 11:13:20AM +0800, Ian Kent wrote:
> > On Tue, 2019-08-27 at 08:39 -0400, Brian Foster wrote:
> > > On Fri, Aug 23, 2019 at 08:59:27AM +0800, Ian Kent wrote:
> > > > The new mount-api uses an array of struct fs_parameter_spec for
> > > > parameter parsing, create this table populated with the xfs
> > > > mount
> > > > parameters.
> > > >
> > > > The new mount-api table definition is wider than the token
> > > > based
> > > > parameter table and interleaving the option description
> > > > comments
> > > > between each table line is much less readable than adding them
> > > > to
> > > > the end of each table entry. So add the option description
> > > > comment
> > > > to each entry line even though it causes quite a few of the
> > > > entries
> > > > to be longer than 80 characters.
> > > >
> > > > Signed-off-by: Ian Kent <raven@xxxxxxxxxx>
> > > > ---
> > > > fs/xfs/xfs_super.c | 48
> > > > +++++++++++++++++++++++++++++++++++++++++++++---
> > > > 1 file changed, 45 insertions(+), 3 deletions(-)
> > > >
> > > > diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
> > > > index f9450235533c..74c88b92ce22 100644
> > > > --- a/fs/xfs/xfs_super.c
> > > > +++ b/fs/xfs/xfs_super.c
> > > > @@ -38,6 +38,8 @@
> > > >
> > > > #include <linux/magic.h>
> > > > #include <linux/parser.h>
> > > > +#include <linux/fs_context.h>
> > > > +#include <linux/fs_parser.h>
> > > >
> > > > static const struct super_operations xfs_super_operations;
> > > > struct bio_set xfs_ioend_bioset;
> > > > @@ -47,9 +49,6 @@ static struct kset *xfs_kset; /* top-
> > > > level xfs sysfs dir */
> > > > static struct xfs_kobj xfs_dbg_kobj; /* global debug sysfs
> > > > attrs */
> > > > #endif
> > > >
> > > > -/*
> > > > - * Table driven mount option parser.
> > > > - */
> > >
> > > Not sure why this is comment is removed here if the associated
> > > code
> > > is
> > > staying put in this patch..?
> > >
> > > > enum {
> > > > Opt_logbufs, Opt_logbsize, Opt_logdev, Opt_rtdev,
> > > > Opt_biosize,
> > > > Opt_wsync, Opt_noalign, Opt_swalloc, Opt_sunit,
> > > > Opt_swidth,
> > > > Opt_nouuid,
> > > > @@ -109,6 +108,49 @@ static const match_table_t tokens = {
> > > > {Opt_err, NULL},
> > > > };
> > > >
> > > > +static const struct fs_parameter_spec xfs_param_specs[] = {
> > > > + fsparam_u32 ("logbufs", Opt_logbufs), /* number of XFS
> > > > log buffers */
> > > > + fsparam_string ("logbsize", Opt_logbsize), /* size of XFS
> > > > log
> > > > buffers */
> > > > + fsparam_string ("logdev", Opt_logdev), /* log device
> > > > */
> > > > + fsparam_string ("rtdev", Opt_rtdev), /* realtime I/O
> > > > device */
> > > > + fsparam_u32 ("biosize", Opt_biosize), /* log2 of
> > > > preferred buffered io size */
> > >
> > > Hmm.. it looks like the difference between numerical values as
> > > strings
> > > vs. numeric types is whether we support things like unit suffixes
> > > (i.e.
> > > "64k"). That said, Opt_biosize uses suffix_kstrtoint() similar to
> > > Opt_logbsize yet is defined here as a u32 (and Opt_allocsize
> > > falls
> > > into
> > > the same parsing code but is a string). Is that wrong or am I
> > > just
> > > missing something wrt to the type specifiers here?
> >
> > Right, the distinction appeared to be between those that use a
> > human
> > unit (like 64k etc.) and those that don't.
> >
> > Opt_biosize looked different in that it's described to be "log2 of
> > preferred buffered io size" so I don't think it can be given as a
> > human unit and that also appeared to be the case from the original
> > options table.
> >
> > Do I need to change this somehow?
> >
>
> I'm not sure. Can you respond to the question in my most recent
> reply[1]
> to this patch please?
>
> Brian
>
> [1] https://lore.kernel.org/linux-xfs/20190830115611.GA25927@bfoster/
I see, yes, they are different in the unchanged source.
It seems to me that the handling of these should be changed since
it looks like Opt_allocsize can have a human unit value while
Opt_biosize, given it's listed as a log2 value, it doesn't make
sense to call suffix_kstrtoint() on it.
Maybe that should be corrected as a pre-patch in the series or
forwarded separately ... although I can see how this has gone
unnoticed.
>
> > > Brian
> > >
> > > > + fsparam_flag ("wsync", Opt_wsync), /* safe-mode nfs
> > > > compatible mount */
> > > > + fsparam_flag ("noalign", Opt_noalign), /* turn off
> > > > stripe alignment */
> > > > + fsparam_flag ("swalloc", Opt_swalloc), /* turn on
> > > > stripe width allocation */
> > > > + fsparam_u32 ("sunit", Opt_sunit), /* data volume
> > > > stripe unit */
> > > > + fsparam_u32 ("swidth", Opt_swidth), /* data volume
> > > > stripe width */
> > > > + fsparam_flag ("nouuid", Opt_nouuid), /* ignore
> > > > filesystem UUID */
> > > > + fsparam_flag_no("grpid", Opt_grpid), /* group-ID
> > > > from
> > > > parent directory (or not) */
> > > > + fsparam_flag ("bsdgroups", Opt_bsdgroups), /* group-ID from
> > > > parent directory */
> > > > + fsparam_flag ("sysvgroups", Opt_sysvgroups),/* group-ID from
> > > > current process */
> > > > + fsparam_string ("allocsize", Opt_allocsize), /* preferred
> > > > allocation size */
> > > > + fsparam_flag ("norecovery", Opt_norecovery),/* don't run XFS
> > > > recovery */
> > > > + fsparam_flag ("inode64", Opt_inode64), /* inodes can be
> > > > allocated anywhere */
> > > > + fsparam_flag ("inode32", Opt_inode32), /* inode
> > > > allocation limited to XFS_MAXINUMBER_32 */
> > > > + fsparam_flag_no("ikeep", Opt_ikeep), /* do not free
> > > > (or
> > > > keep) empty inode clusters */
> > > > + fsparam_flag_no("largeio", Opt_largeio), /* report (or
> > > > do
> > > > not report) large I/O sizes in stat() */
> > > > + fsparam_flag_no("attr2", Opt_attr2), /* do (or do
> > > > not)
> > > > use attr2 attribute format */
> > > > + fsparam_flag ("filestreams",Opt_filestreams), /* use
> > > > filestreams allocator */
> > > > + fsparam_flag_no("quota", Opt_quota), /* disk quotas
> > > > (user) */
> > > > + fsparam_flag ("usrquota", Opt_usrquota), /* user quota
> > > > enabled */
> > > > + fsparam_flag ("grpquota", Opt_grpquota), /* group quota
> > > > enabled */
> > > > + fsparam_flag ("prjquota", Opt_prjquota), /* project quota
> > > > enabled */
> > > > + fsparam_flag ("uquota", Opt_uquota), /* user quota
> > > > (IRIX variant) */
> > > > + fsparam_flag ("gquota", Opt_gquota), /* group quota
> > > > (IRIX variant) */
> > > > + fsparam_flag ("pquota", Opt_pquota), /* project quota
> > > > (IRIX variant) */
> > > > + fsparam_flag ("uqnoenforce",Opt_uqnoenforce), /* user quota
> > > > limit enforcement */
> > > > + fsparam_flag ("gqnoenforce",Opt_gqnoenforce), /* group quota
> > > > limit enforcement */
> > > > + fsparam_flag ("pqnoenforce",Opt_pqnoenforce), /* project
> > > > quota limit enforcement */
> > > > + fsparam_flag ("qnoenforce", Opt_qnoenforce), /* same as
> > > > uqnoenforce */
> > > > + fsparam_flag_no("discard", Opt_discard), /* Do (or do
> > > > not)
> > > > not discard unused blocks */
> > > > + fsparam_flag ("dax", Opt_dax), /* Enable
> > > > direct access to bdev pages */
> > > > + {}
> > > > +};
> > > > +
> > > > +static const struct fs_parameter_description xfs_fs_parameters
> > > > = {
> > > > + .name = "XFS",
> > > > + .specs = xfs_param_specs,
> > > > +};
> > > >
> > > > STATIC int
> > > > suffix_kstrtoint(const substring_t *s, unsigned int base, int
> > > > *res)
> > > >
