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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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079b72bca3
This patch adds the ability to publish supported features to sysfs under /sys/fs/btrfs/features. The files are module-wide and export which features the kernel supports. The content, for now, is just "0\n". Signed-off-by: Jeff Mahoney <jeffm@suse.com> Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <clm@fb.com>
43 lines
1.3 KiB
C
43 lines
1.3 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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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, NULL), \
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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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#endif /* _BTRFS_SYSFS_H_ */
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