6ab0a2029c
While trying to debug ENOSPC issues, it's helpful to understand what the kernel's view of the available space is. We export this information via ioctl, but sysfs files are more easily used. Signed-off-by: Jeff Mahoney <jeffm@suse.com> Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <clm@fb.com>
65 lines
2.2 KiB
C
65 lines
2.2 KiB
C
#ifndef _BTRFS_SYSFS_H_
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#define _BTRFS_SYSFS_H_
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enum btrfs_feature_set {
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FEAT_COMPAT,
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FEAT_COMPAT_RO,
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FEAT_INCOMPAT,
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FEAT_MAX
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};
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#define __INIT_KOBJ_ATTR(_name, _mode, _show, _store) \
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{ \
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.attr = { .name = __stringify(_name), .mode = _mode }, \
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.show = _show, \
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.store = _store, \
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}
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#define BTRFS_ATTR_RW(_name, _mode, _show, _store) \
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static struct kobj_attribute btrfs_attr_##_name = \
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__INIT_KOBJ_ATTR(_name, _mode, _show, _store)
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#define BTRFS_ATTR(_name, _mode, _show) \
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BTRFS_ATTR_RW(_name, _mode, _show, NULL)
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#define BTRFS_ATTR_PTR(_name) (&btrfs_attr_##_name.attr)
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#define BTRFS_RAID_ATTR(_name, _show) \
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static struct kobj_attribute btrfs_raid_attr_##_name = \
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__INIT_KOBJ_ATTR(_name, 0444, _show, NULL)
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#define BTRFS_RAID_ATTR_PTR(_name) (&btrfs_raid_attr_##_name.attr)
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struct btrfs_feature_attr {
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struct kobj_attribute kobj_attr;
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enum btrfs_feature_set feature_set;
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u64 feature_bit;
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};
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#define BTRFS_FEAT_ATTR(_name, _feature_set, _prefix, _feature_bit) \
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static struct btrfs_feature_attr btrfs_attr_##_name = { \
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.kobj_attr = __INIT_KOBJ_ATTR(_name, S_IRUGO, \
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btrfs_feature_attr_show, \
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btrfs_feature_attr_store), \
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.feature_set = _feature_set, \
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.feature_bit = _prefix ##_## _feature_bit, \
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}
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#define BTRFS_FEAT_ATTR_PTR(_name) (&btrfs_attr_##_name.kobj_attr.attr)
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#define BTRFS_FEAT_ATTR_COMPAT(name, feature) \
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BTRFS_FEAT_ATTR(name, FEAT_COMPAT, BTRFS_FEATURE_COMPAT, feature)
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#define BTRFS_FEAT_ATTR_COMPAT_RO(name, feature) \
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BTRFS_FEAT_ATTR(name, FEAT_COMPAT_RO, BTRFS_FEATURE_COMPAT, feature)
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#define BTRFS_FEAT_ATTR_INCOMPAT(name, feature) \
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BTRFS_FEAT_ATTR(name, FEAT_INCOMPAT, BTRFS_FEATURE_INCOMPAT, feature)
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/* convert from attribute */
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#define to_btrfs_feature_attr(a) \
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container_of(a, struct btrfs_feature_attr, kobj_attr)
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#define attr_to_btrfs_attr(a) container_of(a, struct kobj_attribute, attr)
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#define attr_to_btrfs_feature_attr(a) \
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to_btrfs_feature_attr(attr_to_btrfs_attr(a))
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char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags);
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extern const char * const btrfs_feature_set_names[3];
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extern struct kobj_type space_info_ktype;
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extern struct kobj_type btrfs_raid_ktype;
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#endif /* _BTRFS_SYSFS_H_ */
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