void nilfs_sufile_do_set_error(struct inode *sufile, __u64 segnum, struct buffer_head *header_bh, struct buffer_head *su_bh) { struct nilfs_segment_usage *su; void *kaddr; int suclean; kaddr = kmap_atomic(su_bh->b_page); su = nilfs_sufile_block_get_segment_usage(sufile, segnum, su_bh, kaddr); if (nilfs_segment_usage_error(su)) { kunmap_atomic(kaddr); return; } suclean = nilfs_segment_usage_clean(su); nilfs_segment_usage_set_error(su); kunmap_atomic(kaddr); if (suclean) { nilfs_sufile_mod_counter(header_bh, -1, 0); NILFS_SUI(sufile)->ncleansegs--; } mark_buffer_dirty(su_bh); nilfs_mdt_mark_dirty(sufile); }
void nilfs_sufile_do_free(struct inode *sufile, __u64 segnum, struct buffer_head *header_bh, struct buffer_head *su_bh) { struct nilfs_segment_usage *su; void *kaddr; int sudirty; kaddr = kmap_atomic(su_bh->b_page); su = nilfs_sufile_block_get_segment_usage(sufile, segnum, su_bh, kaddr); if (nilfs_segment_usage_clean(su)) { printk(KERN_WARNING "%s: segment %llu is already clean\n", __func__, (unsigned long long)segnum); kunmap_atomic(kaddr); return; } WARN_ON(nilfs_segment_usage_error(su)); WARN_ON(!nilfs_segment_usage_dirty(su)); sudirty = nilfs_segment_usage_dirty(su); nilfs_segment_usage_set_clean(su); kunmap_atomic(kaddr); mark_buffer_dirty(su_bh); nilfs_sufile_mod_counter(header_bh, 1, sudirty ? (u64)-1 : 0); NILFS_SUI(sufile)->ncleansegs++; nilfs_mdt_mark_dirty(sufile); }
int nilfs_sufile_set_segment_usage(struct inode *sufile, __u64 segnum, unsigned long nblocks, time_t modtime) { struct buffer_head *bh; struct nilfs_segment_usage *su; void *kaddr; int ret; down_write(&NILFS_MDT(sufile)->mi_sem); ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 0, &bh); if (ret < 0) goto out_sem; kaddr = kmap_atomic(bh->b_page); su = nilfs_sufile_block_get_segment_usage(sufile, segnum, bh, kaddr); WARN_ON(nilfs_segment_usage_error(su)); if (modtime) su->su_lastmod = cpu_to_le64(modtime); su->su_nblocks = cpu_to_le32(nblocks); kunmap_atomic(kaddr); mark_buffer_dirty(bh); nilfs_mdt_mark_dirty(sufile); brelse(bh); out_sem: up_write(&NILFS_MDT(sufile)->mi_sem); return ret; }
/** * nilfs_sufile_get_segment_usage - get a segment usage * @sufile: inode of segment usage file * @segnum: segment number * @sup: pointer to segment usage * @bhp: pointer to buffer head * * Description: nilfs_sufile_get_segment_usage() acquires the segment usage * specified by @segnum. * * Return Value: On success, 0 is returned, and the segment usage and the * buffer head of the buffer on which the segment usage is located are stored * in the place pointed by @sup and @bhp, respectively. On error, one of the * following negative error codes is returned. * * %-EIO - I/O error. * * %-ENOMEM - Insufficient amount of memory available. * * %-EINVAL - Invalid segment usage number. */ int nilfs_sufile_get_segment_usage(struct inode *sufile, __u64 segnum, struct nilfs_segment_usage **sup, struct buffer_head **bhp) { struct buffer_head *bh; struct nilfs_segment_usage *su; void *kaddr; int ret; /* segnum is 0 origin */ if (segnum >= nilfs_sufile_get_nsegments(sufile)) return -EINVAL; down_write(&NILFS_MDT(sufile)->mi_sem); ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 1, &bh); if (ret < 0) goto out_sem; kaddr = kmap(bh->b_page); su = nilfs_sufile_block_get_segment_usage(sufile, segnum, bh, kaddr); if (nilfs_segment_usage_error(su)) { kunmap(bh->b_page); brelse(bh); ret = -EINVAL; goto out_sem; } if (sup != NULL) *sup = su; *bhp = bh; out_sem: up_write(&NILFS_MDT(sufile)->mi_sem); return ret; }
static int nilfs_sufile_truncate_range(struct inode *sufile, __u64 start, __u64 end) { struct the_nilfs *nilfs = sufile->i_sb->s_fs_info; struct buffer_head *header_bh; struct buffer_head *su_bh; struct nilfs_segment_usage *su, *su2; size_t susz = NILFS_MDT(sufile)->mi_entry_size; unsigned long segusages_per_block; unsigned long nsegs, ncleaned; __u64 segnum; void *kaddr; ssize_t n, nc; int ret; int j; nsegs = nilfs_sufile_get_nsegments(sufile); ret = -EINVAL; if (start > end || start >= nsegs) goto out; ret = nilfs_sufile_get_header_block(sufile, &header_bh); if (ret < 0) goto out; segusages_per_block = nilfs_sufile_segment_usages_per_block(sufile); ncleaned = 0; for (segnum = start; segnum <= end; segnum += n) { n = min_t(unsigned long, segusages_per_block - nilfs_sufile_get_offset(sufile, segnum), end - segnum + 1); ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 0, &su_bh); if (ret < 0) { if (ret != -ENOENT) goto out_header; continue; } kaddr = kmap_atomic(su_bh->b_page); su = nilfs_sufile_block_get_segment_usage( sufile, segnum, su_bh, kaddr); su2 = su; for (j = 0; j < n; j++, su = (void *)su + susz) { if ((le32_to_cpu(su->su_flags) & ~(1UL << NILFS_SEGMENT_USAGE_ERROR)) || nilfs_segment_is_active(nilfs, segnum + j)) { ret = -EBUSY; kunmap_atomic(kaddr); brelse(su_bh); goto out_header; } } nc = 0; for (su = su2, j = 0; j < n; j++, su = (void *)su + susz) { if (nilfs_segment_usage_error(su)) { nilfs_segment_usage_set_clean(su); nc++; } } kunmap_atomic(kaddr); if (nc > 0) { mark_buffer_dirty(su_bh); ncleaned += nc; } brelse(su_bh); if (n == segusages_per_block) { nilfs_sufile_delete_segment_usage_block(sufile, segnum); } } ret = 0; out_header: if (ncleaned > 0) { NILFS_SUI(sufile)->ncleansegs += ncleaned; nilfs_sufile_mod_counter(header_bh, ncleaned, 0); nilfs_mdt_mark_dirty(sufile); } brelse(header_bh); out: return ret; }