fs/nilfs2/sufile.h

0001 /* SPDX-License-Identifier: GPL-2.0+ */
0002 /*
0003  * NILFS segment usage file.
0004  *
0005  * Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation.
0006  *
0007  * Written by Koji Sato.
0008  */
0009
0010 #ifndef _NILFS_SUFILE_H
0011 #define _NILFS_SUFILE_H
0012
0013 #include <linux/fs.h>
0014 #include <linux/buffer_head.h>
0015 #include "mdt.h"
0016
0017
0018 static inline unsigned long nilfs_sufile_get_nsegments(struct inode *sufile)
0019 {
0020     return ((struct the_nilfs *)sufile->i_sb->s_fs_info)->ns_nsegments;
0021 }
0022
0023 unsigned long nilfs_sufile_get_ncleansegs(struct inode *sufile);
0024
0025 int nilfs_sufile_set_alloc_range(struct inode *sufile, __u64 start, __u64 end);
0026 int nilfs_sufile_alloc(struct inode *, __u64 *);
0027 int nilfs_sufile_mark_dirty(struct inode *sufile, __u64 segnum);
0028 int nilfs_sufile_set_segment_usage(struct inode *sufile, __u64 segnum,
0029                    unsigned long nblocks, time64_t modtime);
0030 int nilfs_sufile_get_stat(struct inode *, struct nilfs_sustat *);
0031 ssize_t nilfs_sufile_get_suinfo(struct inode *, __u64, void *, unsigned int,
0032                 size_t);
0033 ssize_t nilfs_sufile_set_suinfo(struct inode *, void *, unsigned int, size_t);
0034
0035 int nilfs_sufile_updatev(struct inode *, __u64 *, size_t, int, size_t *,
0036              void (*dofunc)(struct inode *, __u64,
0037                     struct buffer_head *,
0038                     struct buffer_head *));
0039 int nilfs_sufile_update(struct inode *, __u64, int,
0040             void (*dofunc)(struct inode *, __u64,
0041                        struct buffer_head *,
0042                        struct buffer_head *));
0043 void nilfs_sufile_do_scrap(struct inode *, __u64, struct buffer_head *,
0044                struct buffer_head *);
0045 void nilfs_sufile_do_free(struct inode *, __u64, struct buffer_head *,
0046               struct buffer_head *);
0047 void nilfs_sufile_do_cancel_free(struct inode *, __u64, struct buffer_head *,
0048                  struct buffer_head *);
0049 void nilfs_sufile_do_set_error(struct inode *, __u64, struct buffer_head *,
0050                    struct buffer_head *);
0051
0052 int nilfs_sufile_resize(struct inode *sufile, __u64 newnsegs);
0053 int nilfs_sufile_read(struct super_block *sb, size_t susize,
0054               struct nilfs_inode *raw_inode, struct inode **inodep);
0055 int nilfs_sufile_trim_fs(struct inode *sufile, struct fstrim_range *range);
0056
0057 /**
0058  * nilfs_sufile_scrap - make a segment garbage
0059  * @sufile: inode of segment usage file
0060  * @segnum: segment number to be freed
0061  */
0062 static inline int nilfs_sufile_scrap(struct inode *sufile, __u64 segnum)
0063 {
0064     return nilfs_sufile_update(sufile, segnum, 1, nilfs_sufile_do_scrap);
0065 }
0066
0067 /**
0068  * nilfs_sufile_free - free segment
0069  * @sufile: inode of segment usage file
0070  * @segnum: segment number to be freed
0071  */
0072 static inline int nilfs_sufile_free(struct inode *sufile, __u64 segnum)
0073 {
0074     return nilfs_sufile_update(sufile, segnum, 0, nilfs_sufile_do_free);
0075 }
0076
0077 /**
0078  * nilfs_sufile_freev - free segments
0079  * @sufile: inode of segment usage file
0080  * @segnumv: array of segment numbers
0081  * @nsegs: size of @segnumv array
0082  * @ndone: place to store the number of freed segments
0083  */
0084 static inline int nilfs_sufile_freev(struct inode *sufile, __u64 *segnumv,
0085                      size_t nsegs, size_t *ndone)
0086 {
0087     return nilfs_sufile_updatev(sufile, segnumv, nsegs, 0, ndone,
0088                     nilfs_sufile_do_free);
0089 }
0090
0091 /**
0092  * nilfs_sufile_cancel_freev - reallocate freeing segments
0093  * @sufile: inode of segment usage file
0094  * @segnumv: array of segment numbers
0095  * @nsegs: size of @segnumv array
0096  * @ndone: place to store the number of cancelled segments
0097  *
0098  * Return Value: On success, 0 is returned. On error, a negative error codes
0099  * is returned.
0100  */
0101 static inline int nilfs_sufile_cancel_freev(struct inode *sufile,
0102                         __u64 *segnumv, size_t nsegs,
0103                         size_t *ndone)
0104 {
0105     return nilfs_sufile_updatev(sufile, segnumv, nsegs, 0, ndone,
0106                     nilfs_sufile_do_cancel_free);
0107 }
0108
0109 /**
0110  * nilfs_sufile_set_error - mark a segment as erroneous
0111  * @sufile: inode of segment usage file
0112  * @segnum: segment number
0113  *
0114  * Description: nilfs_sufile_set_error() marks the segment specified by
0115  * @segnum as erroneous. The error segment will never be used again.
0116  *
0117  * Return Value: On success, 0 is returned. On error, one of the following
0118  * negative error codes is returned.
0119  *
0120  * %-EIO - I/O error.
0121  *
0122  * %-ENOMEM - Insufficient amount of memory available.
0123  *
0124  * %-EINVAL - Invalid segment usage number.
0125  */
0126 static inline int nilfs_sufile_set_error(struct inode *sufile, __u64 segnum)
0127 {
0128     return nilfs_sufile_update(sufile, segnum, 0,
0129                    nilfs_sufile_do_set_error);
0130 }
0131
0132 #endif  /* _NILFS_SUFILE_H */