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Diffstat (limited to 'fs/nilfs2/sufile.h')
| -rw-r--r-- | fs/nilfs2/sufile.h | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/fs/nilfs2/sufile.h b/fs/nilfs2/sufile.h new file mode 100644 index 000000000..5888ed479 --- /dev/null +++ b/fs/nilfs2/sufile.h @@ -0,0 +1,162 @@ +/* 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 */ |