| Message ID | 1458225037-24155-2-git-send-email-bfoster@redhat.com (mailing list archive) |
|---|---|
| State | Superseded, archived |
| Delegated to: | Mike Snitzer |
| Headers | show |
Re-add dm-devel@redhat.com, linux-block@vger.kernel.org to CC. On Tue, Mar 22, 2016 at 08:53:33AM +1100, Dave Chinner wrote: > On Mon, Mar 21, 2016 at 01:08:29PM +0100, Carlos Maiolino wrote: > > Hi, > > > > Good news about this interface, I just have a small suggestion in this patch: > > > > On Thu, Mar 17, 2016 at 10:30:29AM -0400, Brian Foster wrote: > > > From: Mike Snitzer <snitzer@redhat.com> > > > > > > Signed-off-by: Mike Snitzer <snitzer@redhat.com> > > > --- > > > fs/block_dev.c | 20 ++++++++++++++++++++ > > > include/linux/blkdev.h | 5 +++++ > > > 2 files changed, 25 insertions(+) > > > > > > diff --git a/fs/block_dev.c b/fs/block_dev.c > > > index 826b164..375a2e4 100644 > > > --- a/fs/block_dev.c > > > +++ b/fs/block_dev.c > > > @@ -497,6 +497,26 @@ long bdev_direct_access(struct block_device *bdev, struct blk_dax_ctl *dax) > > > } > > > EXPORT_SYMBOL_GPL(bdev_direct_access); > > > > > > +int blk_reserve_space(struct block_device *bdev, sector_t nr_sects) > > > +{ > > > + const struct block_device_operations *ops = bdev->bd_disk->fops; > > > + > > > + if (!ops->reserve_space) > > > + return -EOPNOTSUPP; > > > + return ops->reserve_space(bdev, nr_sects); > > > +} > > > +EXPORT_SYMBOL_GPL(blk_reserve_space); > > > > Wouldn't be better to have this function name standardized accordingly to the > > next one? Something like blk_set_reserved_space() maybe? > > Personally I see no point in wrappers like this. We don't add > wrappers for ops methods in any other layers of the stack, > filesystems are quite capable of checking if the method is available > directly, so it seems pretty pointless to me... > I don't have too much of a preference, personally. I think these were slapped together fairly quickly just to get some kind of mechanism exposed. I was thinking more of combining them into a single method that takes a signed value for a reservation delta rather than an absolute value and simultaneously supports the ability to adjust or retrieve the current reservation. Unless I hear other thoughts or objections, I can probably clean that up and drop the wrappers for a subsequent post as I have some other fixes pending as well. Brian > Cheers, > > Dave. > -- > Dave Chinner > david@fromorbit.com > -- > To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- dm-devel mailing list dm-devel@redhat.com https://www.redhat.com/mailman/listinfo/dm-devel
diff --git a/fs/block_dev.c b/fs/block_dev.c index 826b164..375a2e4 100644 --- a/fs/block_dev.c +++ b/fs/block_dev.c @@ -497,6 +497,26 @@ long bdev_direct_access(struct block_device *bdev, struct blk_dax_ctl *dax) } EXPORT_SYMBOL_GPL(bdev_direct_access); +int blk_reserve_space(struct block_device *bdev, sector_t nr_sects) +{ + const struct block_device_operations *ops = bdev->bd_disk->fops; + + if (!ops->reserve_space) + return -EOPNOTSUPP; + return ops->reserve_space(bdev, nr_sects); +} +EXPORT_SYMBOL_GPL(blk_reserve_space); + +int blk_get_reserved_space(struct block_device *bdev, sector_t *nr_sects) +{ + const struct block_device_operations *ops = bdev->bd_disk->fops; + + if (!ops->get_reserved_space) + return -EOPNOTSUPP; + return ops->get_reserved_space(bdev, nr_sects); +} +EXPORT_SYMBOL_GPL(blk_get_reserved_space); + /* * pseudo-fs */ diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 413c84f..f212fe5 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -1664,6 +1664,8 @@ struct block_device_operations { int (*getgeo)(struct block_device *, struct hd_geometry *); /* this callback is with swap_lock and sometimes page table lock held */ void (*swap_slot_free_notify) (struct block_device *, unsigned long); + int (*reserve_space) (struct block_device *, sector_t); + int (*get_reserved_space) (struct block_device *, sector_t *); struct module *owner; const struct pr_ops *pr_ops; }; @@ -1674,6 +1676,9 @@ extern int bdev_read_page(struct block_device *, sector_t, struct page *); extern int bdev_write_page(struct block_device *, sector_t, struct page *, struct writeback_control *); extern long bdev_direct_access(struct block_device *, struct blk_dax_ctl *); + +extern int blk_reserve_space(struct block_device *, sector_t); +extern int blk_get_reserved_space(struct block_device *, sector_t *); #else /* CONFIG_BLOCK */ struct block_device;