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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* NILFS segment usage file.
*
* Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation.
*
* Written by Koji Sato.
*/
#ifndef _NILFS_SUFILE_H
#define _NILFS_SUFILE_H
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/buffer_head.h>
#include "mdt.h"
static inline unsigned long nilfs_sufile_get_nsegments(struct inode *sufile)
{
return ((struct the_nilfs *)sufile->i_sb->s_fs_info)->ns_nsegments;
}
unsigned long nilfs_sufile_get_ncleansegs(struct inode *sufile);
int nilfs_sufile_set_alloc_range(struct inode *sufile, __u64 start, __u64 end);
int nilfs_sufile_alloc(struct inode *, __u64 *);
int nilfs_sufile_mark_dirty(struct inode *sufile, __u64 segnum);
int nilfs_sufile_set_segment_usage(struct inode *sufile, __u64 segnum,
unsigned long nblocks, time64_t modtime);
int nilfs_sufile_get_stat(struct inode *, struct nilfs_sustat *);
ssize_t nilfs_sufile_get_suinfo(struct inode *, __u64, void *, unsigned int,
size_t);
ssize_t nilfs_sufile_set_suinfo(struct inode *, void *, unsigned int, size_t);
int nilfs_sufile_updatev(struct inode *, __u64 *, size_t, int, size_t *,
void (*dofunc)(struct inode *, __u64,
struct buffer_head *,
struct buffer_head *));
int nilfs_sufile_update(struct inode *, __u64, int,
void (*dofunc)(struct inode *, __u64,
struct buffer_head *,
struct buffer_head *));
void nilfs_sufile_do_scrap(struct inode *, __u64, struct buffer_head *,
struct buffer_head *);
void nilfs_sufile_do_free(struct inode *, __u64, struct buffer_head *,
struct buffer_head *);
void nilfs_sufile_do_cancel_free(struct inode *, __u64, struct buffer_head *,
struct buffer_head *);
void nilfs_sufile_do_set_error(struct inode *, __u64, struct buffer_head *,
struct buffer_head *);
int nilfs_sufile_resize(struct inode *sufile, __u64 newnsegs);
int nilfs_sufile_read(struct super_block *sb, size_t susize,
struct nilfs_inode *raw_inode, struct inode **inodep);
int nilfs_sufile_trim_fs(struct inode *sufile, struct fstrim_range *range);
/**
* nilfs_sufile_warn_on_error - warn on unexpected sufile error
* @sufile: inode of segment usage file
* @err: status code returned by a sufile function
*
* Even if buffer heads of blocks containing segment usage entries have
* been dirtied in advance by calling functions such as
* nilfs_sufile_mark_dirty() or nilfs_sufile_{alloc,free}(), those buffers
* can be discarded from memory after the file system detects corruption and
* degrades to read-only mode, which may cause sufile operations, including
* cancel operations, to return errors. nilfs_sufile_warn_on_error() is used
* to detect unexpected errors other than during read-only degradation.
*
* Return: 0 if @err is 0, %-EROFS if in read-only degraded mode, and %-EIO
* otherwise.
*/
#define nilfs_sufile_warn_on_error(sufile, err) \
({ \
int _err = (err); \
\
if (unlikely(_err)) \
_err = WARN_ONCE(!sb_rdonly((sufile)->i_sb), \
"unexpected sufile error %d\n", _err) ? \
-EIO : -EROFS; \
_err; \
})
/**
* nilfs_sufile_scrap - make a segment garbage
* @sufile: inode of segment usage file
* @segnum: segment number to be freed
*
* Return: 0 on success, or a negative error code on failure.
*/
static inline int nilfs_sufile_scrap(struct inode *sufile, __u64 segnum)
{
return nilfs_sufile_update(sufile, segnum, 1, nilfs_sufile_do_scrap);
}
/**
* nilfs_sufile_free - free segment
* @sufile: inode of segment usage file
* @segnum: segment number to be freed
*
* Return: 0 on success, or a negative error code on failure.
*/
static inline int nilfs_sufile_free(struct inode *sufile, __u64 segnum)
{
return nilfs_sufile_update(sufile, segnum, 0, nilfs_sufile_do_free);
}
/**
* nilfs_sufile_freev - free segments
* @sufile: inode of segment usage file
* @segnumv: array of segment numbers
* @nsegs: size of @segnumv array
* @ndone: place to store the number of freed segments
*
* Return: 0 on success, or a negative error code on failure.
*/
static inline int nilfs_sufile_freev(struct inode *sufile, __u64 *segnumv,
size_t nsegs, size_t *ndone)
{
return nilfs_sufile_updatev(sufile, segnumv, nsegs, 0, ndone,
nilfs_sufile_do_free);
}
/**
* nilfs_sufile_cancel_freev - reallocate freeing segments
* @sufile: inode of segment usage file
* @segnumv: array of segment numbers
* @nsegs: size of @segnumv array
* @ndone: place to store the number of cancelled segments
*
* Return: 0 on success, or a negative error code on failure.
*/
static inline int nilfs_sufile_cancel_freev(struct inode *sufile,
__u64 *segnumv, size_t nsegs,
size_t *ndone)
{
return nilfs_sufile_updatev(sufile, segnumv, nsegs, 0, ndone,
nilfs_sufile_do_cancel_free);
}
/**
* nilfs_sufile_set_error - mark a segment as erroneous
* @sufile: inode of segment usage file
* @segnum: segment number
*
* Description: nilfs_sufile_set_error() marks the segment specified by
* @segnum as erroneous. The error segment will never be used again.
*
* Return: 0 on success, or one of the following negative error codes on
* failure:
* * %-EINVAL - Invalid segment usage number.
* * %-EIO - I/O error (including metadata corruption).
* * %-ENOMEM - Insufficient memory available.
*/
static inline int nilfs_sufile_set_error(struct inode *sufile, __u64 segnum)
{
return nilfs_sufile_update(sufile, segnum, 0,
nilfs_sufile_do_set_error);
}
#endif /* _NILFS_SUFILE_H */
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