3  * NILFS segment usage file.
25  * @allocmin: lower limit of allocatable segment range
26  * @allocmax: upper limit of allocatable segment range
31 	__u64 allocmin;		/* lower limit of allocatable segment range */
32 	__u64 allocmax;		/* upper limit of allocatable segment range */
74  * nilfs_sufile_segment_usage_offset - calculate the byte offset of a segment
76  * @sufile: segment usage file inode
77  * @segnum: number of segment usage
78  * @bh:     buffer head of block containing segment usage indexed by @segnum
80  * Return: Byte offset in the folio of the segment usage entry.
98 			    "missing header block in segment usage metadata");  in nilfs_sufile_get_header_block()
135  * @sufile: inode of segment usage file
145  * nilfs_sufile_updatev - modify multiple segment usages at a time
146  * @sufile: inode of segment usage file
147  * @segnumv: array of segment numbers
156  * segment usage entry is contained.  If @ndone is given, the number
162  * * %-EINVAL	- Invalid segment usage number
164  * * %-ENOENT	- Given segment usage is in hole block (may be returned if
187 				   "%s: invalid segment number: %llu",  in nilfs_sufile_updatev()
245 		nilfs_warn(sufile->i_sb, "%s: invalid segment number: %llu",  in nilfs_sufile_update()
268  * nilfs_sufile_set_alloc_range - limit range of segment to be allocated
269  * @sufile: inode of segment usage file
270  * @start: minimum segment number of allocatable region (inclusive)
271  * @end: maximum segment number of allocatable region (inclusive)
273  * Return: 0 on success, or %-ERANGE if segment range is invalid.
294  * nilfs_sufile_alloc - allocate a segment
295  * @sufile: inode of segment usage file
296  * @segnump: pointer to segment number
298  * Description: nilfs_sufile_alloc() allocates a clean segment, and stores
299  * its segment number in the place pointed to by @segnump.
305  * * %-ENOSPC	- No clean segment left.
371 			/* found a clean segment */  in nilfs_sufile_alloc()
418 		nilfs_warn(sufile->i_sb, "%s: segment %llu must be clean",  in nilfs_sufile_do_cancel_free()
451 	/* make the segment garbage */  in nilfs_sufile_do_scrap()
475 		nilfs_warn(sufile->i_sb, "%s: segment %llu is already clean",  in nilfs_sufile_do_free()
481 		nilfs_warn(sufile->i_sb, "free segment %llu marked in error",  in nilfs_sufile_do_free()
486 		nilfs_warn(sufile->i_sb, "free unallocated segment %llu",  in nilfs_sufile_do_free()
502  * nilfs_sufile_mark_dirty - mark the buffer having a segment usage dirty
503  * @sufile: inode of segment usage file
504  * @segnum: segment number
520 				    "segment usage for segment %llu is unreadable due to a hole block",  in nilfs_sufile_mark_dirty()
536 				    "active segment %llu is erroneous",  in nilfs_sufile_mark_dirty()
561  * nilfs_sufile_set_segment_usage - set usage of a segment
562  * @sufile: inode of segment usage file
563  * @segnum: segment number
564  * @nblocks: number of live blocks in the segment
605  * nilfs_sufile_get_stat - get segment usage statistics
606  * @sufile: inode of segment usage file
607  * @sustat: pointer to a structure of segment usage statistics
609  * Description: nilfs_sufile_get_stat() retrieves segment usage statistics
674  * nilfs_sufile_truncate_range - truncate range of segment array
675  * @sufile: inode of segment usage file
676  * @start: start segment number (inclusive)
677  * @end: end segment number (inclusive)
775  * nilfs_sufile_resize - resize segment array
776  * @sufile: inode of segment usage file
821 		 * the segment allocation space while locking the semaphore  in nilfs_sufile_resize()
845  * nilfs_sufile_get_suinfo - get segment usage information
846  * @sufile: inode of segment usage file
847  * @segnum: segment number to start looking
852  * Return: Count of segment usage info items stored in the output buffer on
917  * nilfs_sufile_set_suinfo - sets segment usage info
918  * @sufile: inode of segment usage file
924  * segment usage accordingly. Only the fields indicated by the sup_flags
929  * * %-EINVAL	- Invalid values in input (segment number, flags or nblocks).
1046  * @sufile: inode of segment usage file
1055  * and start+len is rounded down. For each clean segment blkdev_issue_discard
1201  * @susize: size of a segment usage entry
1217 		nilfs_err(sb, "too large segment usage size: %zu bytes",  in nilfs_sufile_read()
1221 		nilfs_err(sb, "too small segment usage size: %zu bytes",  in nilfs_sufile_read()
1247 				  "missing header block in segment usage metadata");  in nilfs_sufile_read()