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 */
89 			    "missing header block in segment usage metadata");  in nilfs_sufile_get_header_block()
128  * @sufile: inode of segment usage file
136  * nilfs_sufile_updatev - modify multiple segment usages at a time
137  * @sufile: inode of segment usage file
138  * @segnumv: array of segment numbers
147  * segment usage entry is contained.  If @ndone is given, the number
158  * %-ENOENT - Given segment usage is in hole block (may be returned if
161  * %-EINVAL - Invalid segment usage number
182 				   "%s: invalid segment number: %llu",  in nilfs_sufile_updatev()
240 		nilfs_warn(sufile->i_sb, "%s: invalid segment number: %llu",  in nilfs_sufile_update()
263  * nilfs_sufile_set_alloc_range - limit range of segment to be allocated
264  * @sufile: inode of segment usage file
265  * @start: minimum segment number of allocatable region (inclusive)
266  * @end: maximum segment number of allocatable region (inclusive)
271  * %-ERANGE - invalid segment region
292  * nilfs_sufile_alloc - allocate a segment
293  * @sufile: inode of segment usage file
294  * @segnump: pointer to segment number
296  * Description: nilfs_sufile_alloc() allocates a clean segment.
298  * Return Value: On success, 0 is returned and the segment number of the
299  * allocated segment is stored in the place pointed by @segnump. On error, one
306  * %-ENOSPC - No clean segment left.
371 			/* found a clean segment */  in nilfs_sufile_alloc()
419 		nilfs_warn(sufile->i_sb, "%s: segment %llu must be clean",  in nilfs_sufile_do_cancel_free()
452 	/* make the segment garbage */  in nilfs_sufile_do_scrap()
476 		nilfs_warn(sufile->i_sb, "%s: segment %llu is already clean",  in nilfs_sufile_do_free()
482 		nilfs_warn(sufile->i_sb, "free segment %llu marked in error",  in nilfs_sufile_do_free()
487 		nilfs_warn(sufile->i_sb, "free unallocated segment %llu",  in nilfs_sufile_do_free()
503  * nilfs_sufile_mark_dirty - mark the buffer having a segment usage dirty
504  * @sufile: inode of segment usage file
505  * @segnum: segment number
519 				    "segment usage for segment %llu is unreadable due to a hole block",  in nilfs_sufile_mark_dirty()
535 				    "active segment %llu is erroneous",  in nilfs_sufile_mark_dirty()
560  * nilfs_sufile_set_segment_usage - set usage of a segment
561  * @sufile: inode of segment usage file
562  * @segnum: segment number
563  * @nblocks: number of live blocks in the segment
602  * nilfs_sufile_get_stat - get segment usage statistics
603  * @sufile: inode of segment usage file
604  * @sustat: pointer to a structure of segment usage statistics
606  * Description: nilfs_sufile_get_stat() returns information about segment
609  * Return Value: On success, 0 is returned, and segment usage information is
676  * nilfs_sufile_truncate_range - truncate range of segment array
677  * @sufile: inode of segment usage file
678  * @start: start segment number (inclusive)
679  * @end: end segment number (inclusive)
781  * nilfs_sufile_resize - resize segment array
782  * @sufile: inode of segment usage file
832 		 * the segment allocation space while locking the semaphore  in nilfs_sufile_resize()
857  * nilfs_sufile_get_suinfo - get segment usage information
858  * @sufile: inode of segment usage file
859  * @segnum: segment number to start looking
864  * Return: Count of segment usage info items stored in the output buffer on
928  * nilfs_sufile_set_suinfo - sets segment usage info
929  * @sufile: inode of segment usage file
935  * segment usage accordingly. Only the fields indicated by the sup_flags
945  * %-EINVAL - Invalid values in input (segment number, flags or nblocks)
1060  * @sufile: inode of segment usage file
1069  * and start+len is rounded down. For each clean segment blkdev_issue_discard
1213  * @susize: size of a segment usage entry
1228 		nilfs_err(sb, "too large segment usage size: %zu bytes",  in nilfs_sufile_read()
1232 		nilfs_err(sb, "too small segment usage size: %zu bytes",  in nilfs_sufile_read()
1258 				  "missing header block in segment usage metadata");  in nilfs_sufile_read()