9c75397609
cleaner, but with more legible code. Includes code for reading and writing to the raw disk device (so that an unmounted fs could be cleaned), for the use of a single daemon to clean multiple filesystems to save on resources, and for recording the old contents of cleaned segments to offline storage for regression testing of the LFS system as a whole; though these new features are not properly tested at this point.
76 lines
2.0 KiB
C
76 lines
2.0 KiB
C
#ifndef CLEANER_H_
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#define CLEANER_H_
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/*
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* An abbreviated version of the SEGUSE data structure.
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*/
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struct clfs_seguse {
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u_int32_t nbytes;
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u_int32_t nsums;
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u_int32_t flags;
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u_int64_t lastmod;
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u_int64_t priority;
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};
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/*
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* The cleaner's view of the superblock data structure.
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*/
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struct clfs {
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struct dlfs lfs_dlfs; /* Leverage LFS lfs_* defines here */
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/* Ifile */
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int clfs_ifilefd; /* Ifile file descriptor */
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struct uvnode *lfs_ivnode; /* Ifile vnode */
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fhandle_t clfs_ifilefh; /* Ifile file handle */
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/* Device */
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int clfs_devfd; /* Device file descriptor */
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struct uvnode *clfs_devvp; /* Device vnode */
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char *clfs_dev; /* Name of device */
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/* Cache of segment status */
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struct clfs_seguse *clfs_segtab; /* Abbreviated seguse table */
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struct clfs_seguse **clfs_segtabp; /* pointers to same */
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/* Progress status */
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int clfs_nactive; /* How many segments' blocks we have */
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int clfs_onhold; /* If cleaning this fs is on hold */
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};
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/*
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* Fraction of the could-be-clean segments required to be clean.
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*/
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#define BUSY_LIM 0.5
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#define IDLE_LIM 0.9
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__BEGIN_DECLS
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/* lfs_cleanerd.c */
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void pwarn(const char *, ...);
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void calc_cb(struct clfs *, int, struct clfs_seguse *);
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int clean_fs(struct clfs *, CLEANERINFO *);
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void dlog(char *, ...);
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void handle_error(struct clfs **, int);
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int init_fs(struct clfs *, char *);
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int invalidate_segment(struct clfs *, int);
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void lfs_ientry(IFILE **, struct clfs *, ino_t, struct ubuf **);
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int load_segment(struct clfs *, int, BLOCK_INFO **, int *);
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int needs_cleaning(struct clfs *, CLEANERINFO *);
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int32_t parse_pseg(struct clfs *, daddr_t, BLOCK_INFO **, int *);
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int reinit_fs(struct clfs *);
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void reload_ifile(struct clfs *);
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void toss_old_blocks(struct clfs *, BLOCK_INFO **, int *);
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/* cleansrv.c */
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void check_control_socket(void);
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void try_to_become_master(int, char **);
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/* coalesce.c */
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int log2int(int);
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int clean_all_inodes(struct clfs *);
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int fork_coalesce(struct clfs *);
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__END_DECLS
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#endif /* CLEANER_H_ */
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