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86 lines
2.7 KiB
C
86 lines
2.7 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef BTRFS_FS_H
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#define BTRFS_FS_H
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/* Compatibility and incompatibility defines */
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void __btrfs_set_fs_incompat(struct btrfs_fs_info *fs_info, u64 flag,
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const char *name);
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void __btrfs_clear_fs_incompat(struct btrfs_fs_info *fs_info, u64 flag,
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const char *name);
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void __btrfs_set_fs_compat_ro(struct btrfs_fs_info *fs_info, u64 flag,
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const char *name);
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void __btrfs_clear_fs_compat_ro(struct btrfs_fs_info *fs_info, u64 flag,
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const char *name);
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#define btrfs_set_fs_incompat(__fs_info, opt) \
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__btrfs_set_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt, #opt)
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#define btrfs_clear_fs_incompat(__fs_info, opt) \
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__btrfs_clear_fs_incompat((__fs_info), BTRFS_FEATURE_INCOMPAT_##opt, #opt)
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#define btrfs_fs_incompat(fs_info, opt) \
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__btrfs_fs_incompat((fs_info), BTRFS_FEATURE_INCOMPAT_##opt)
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#define btrfs_set_fs_compat_ro(__fs_info, opt) \
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__btrfs_set_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt, #opt)
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#define btrfs_clear_fs_compat_ro(__fs_info, opt) \
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__btrfs_clear_fs_compat_ro((__fs_info), BTRFS_FEATURE_COMPAT_RO_##opt, #opt)
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#define btrfs_fs_compat_ro(fs_info, opt) \
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__btrfs_fs_compat_ro((fs_info), BTRFS_FEATURE_COMPAT_RO_##opt)
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static inline bool __btrfs_fs_incompat(struct btrfs_fs_info *fs_info, u64 flag)
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{
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struct btrfs_super_block *disk_super;
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disk_super = fs_info->super_copy;
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return !!(btrfs_super_incompat_flags(disk_super) & flag);
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}
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static inline int __btrfs_fs_compat_ro(struct btrfs_fs_info *fs_info, u64 flag)
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{
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struct btrfs_super_block *disk_super;
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disk_super = fs_info->super_copy;
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return !!(btrfs_super_compat_ro_flags(disk_super) & flag);
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}
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static inline int btrfs_fs_closing(struct btrfs_fs_info *fs_info)
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{
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/* Do it this way so we only ever do one test_bit in the normal case. */
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if (test_bit(BTRFS_FS_CLOSING_START, &fs_info->flags)) {
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if (test_bit(BTRFS_FS_CLOSING_DONE, &fs_info->flags))
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return 2;
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return 1;
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}
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return 0;
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}
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/*
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* If we remount the fs to be R/O or umount the fs, the cleaner needn't do
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* anything except sleeping. This function is used to check the status of
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* the fs.
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* We check for BTRFS_FS_STATE_RO to avoid races with a concurrent remount,
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* since setting and checking for SB_RDONLY in the superblock's flags is not
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* atomic.
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*/
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static inline int btrfs_need_cleaner_sleep(struct btrfs_fs_info *fs_info)
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{
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return test_bit(BTRFS_FS_STATE_RO, &fs_info->fs_state) ||
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btrfs_fs_closing(fs_info);
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}
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static inline void btrfs_set_sb_rdonly(struct super_block *sb)
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{
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sb->s_flags |= SB_RDONLY;
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set_bit(BTRFS_FS_STATE_RO, &btrfs_sb(sb)->fs_state);
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}
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static inline void btrfs_clear_sb_rdonly(struct super_block *sb)
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{
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sb->s_flags &= ~SB_RDONLY;
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clear_bit(BTRFS_FS_STATE_RO, &btrfs_sb(sb)->fs_state);
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}
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#endif
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