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extern int gfs2_alloc_block(struct gfs2_inode *ip, u64 *bn, unsigned int *n);
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extern int gfs2_alloc_di(struct gfs2_inode *ip, u64 *bn, u64 *generation);
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extern void gfs2_free_data(struct gfs2_inode *ip, u64 bstart, u32 blen);
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extern void gfs2_free_meta(struct gfs2_inode *ip, u64 bstart, u32 blen);
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extern void gfs2_free_di(struct gfs2_rgrpd *rgd, struct gfs2_inode *ip);
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extern void gfs2_unlink_di(struct inode *inode);