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fs/nilfs2/sufile.c
31.6 KB
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// SPDX-License-Identifier: GPL-2.0+ |
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/* * sufile.c - NILFS segment usage file. * * Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation. * |
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* Written by Koji Sato. * Revised by Ryusuke Konishi. |
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*/ #include <linux/kernel.h> #include <linux/fs.h> #include <linux/string.h> #include <linux/buffer_head.h> #include <linux/errno.h> |
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#include "mdt.h" #include "sufile.h" |
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#include <trace/events/nilfs2.h> |
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/** * struct nilfs_sufile_info - on-memory private data of sufile * @mi: on-memory private data of metadata file * @ncleansegs: number of clean segments * @allocmin: lower limit of allocatable segment range * @allocmax: upper limit of allocatable segment range */ |
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struct nilfs_sufile_info { struct nilfs_mdt_info mi; |
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unsigned long ncleansegs;/* number of clean segments */ __u64 allocmin; /* lower limit of allocatable segment range */ __u64 allocmax; /* upper limit of allocatable segment range */ |
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}; static inline struct nilfs_sufile_info *NILFS_SUI(struct inode *sufile) { return (struct nilfs_sufile_info *)NILFS_MDT(sufile); } |
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static inline unsigned long nilfs_sufile_segment_usages_per_block(const struct inode *sufile) { return NILFS_MDT(sufile)->mi_entries_per_block; } static unsigned long nilfs_sufile_get_blkoff(const struct inode *sufile, __u64 segnum) { __u64 t = segnum + NILFS_MDT(sufile)->mi_first_entry_offset; |
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do_div(t, nilfs_sufile_segment_usages_per_block(sufile)); return (unsigned long)t; } static unsigned long nilfs_sufile_get_offset(const struct inode *sufile, __u64 segnum) { __u64 t = segnum + NILFS_MDT(sufile)->mi_first_entry_offset; |
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return do_div(t, nilfs_sufile_segment_usages_per_block(sufile)); } static unsigned long nilfs_sufile_segment_usages_in_block(const struct inode *sufile, __u64 curr, __u64 max) { return min_t(unsigned long, nilfs_sufile_segment_usages_per_block(sufile) - nilfs_sufile_get_offset(sufile, curr), max - curr + 1); } |
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static struct nilfs_segment_usage * nilfs_sufile_block_get_segment_usage(const struct inode *sufile, __u64 segnum, struct buffer_head *bh, void *kaddr) { return kaddr + bh_offset(bh) + nilfs_sufile_get_offset(sufile, segnum) * NILFS_MDT(sufile)->mi_entry_size; } static inline int nilfs_sufile_get_header_block(struct inode *sufile, struct buffer_head **bhp) { return nilfs_mdt_get_block(sufile, 0, 0, NULL, bhp); } static inline int nilfs_sufile_get_segment_usage_block(struct inode *sufile, __u64 segnum, int create, struct buffer_head **bhp) { return nilfs_mdt_get_block(sufile, nilfs_sufile_get_blkoff(sufile, segnum), create, NULL, bhp); } |
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static int nilfs_sufile_delete_segment_usage_block(struct inode *sufile, __u64 segnum) { return nilfs_mdt_delete_block(sufile, nilfs_sufile_get_blkoff(sufile, segnum)); } |
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static void nilfs_sufile_mod_counter(struct buffer_head *header_bh, u64 ncleanadd, u64 ndirtyadd) { struct nilfs_sufile_header *header; void *kaddr; |
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kaddr = kmap_atomic(header_bh->b_page); |
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header = kaddr + bh_offset(header_bh); le64_add_cpu(&header->sh_ncleansegs, ncleanadd); le64_add_cpu(&header->sh_ndirtysegs, ndirtyadd); |
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kunmap_atomic(kaddr); |
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|
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mark_buffer_dirty(header_bh); |
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} |
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/** |
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* nilfs_sufile_get_ncleansegs - return the number of clean segments * @sufile: inode of segment usage file */ unsigned long nilfs_sufile_get_ncleansegs(struct inode *sufile) { return NILFS_SUI(sufile)->ncleansegs; } /** |
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* nilfs_sufile_updatev - modify multiple segment usages at a time * @sufile: inode of segment usage file * @segnumv: array of segment numbers * @nsegs: size of @segnumv array * @create: creation flag * @ndone: place to store number of modified segments on @segnumv * @dofunc: primitive operation for the update * * Description: nilfs_sufile_updatev() repeatedly calls @dofunc * against the given array of segments. The @dofunc is called with * buffers of a header block and the sufile block in which the target * segment usage entry is contained. If @ndone is given, the number * of successfully modified segments from the head is stored in the * place @ndone points to. * * Return Value: On success, zero is returned. On error, one of the * following negative error codes is returned. * * %-EIO - I/O error. * * %-ENOMEM - Insufficient amount of memory available. * * %-ENOENT - Given segment usage is in hole block (may be returned if * @create is zero) * * %-EINVAL - Invalid segment usage number */ int nilfs_sufile_updatev(struct inode *sufile, __u64 *segnumv, size_t nsegs, int create, size_t *ndone, void (*dofunc)(struct inode *, __u64, struct buffer_head *, struct buffer_head *)) { struct buffer_head *header_bh, *bh; unsigned long blkoff, prev_blkoff; __u64 *seg; size_t nerr = 0, n = 0; int ret = 0; if (unlikely(nsegs == 0)) goto out; down_write(&NILFS_MDT(sufile)->mi_sem); for (seg = segnumv; seg < segnumv + nsegs; seg++) { if (unlikely(*seg >= nilfs_sufile_get_nsegments(sufile))) { |
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nilfs_msg(sufile->i_sb, KERN_WARNING, "%s: invalid segment number: %llu", __func__, (unsigned long long)*seg); |
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nerr++; } } if (nerr > 0) { ret = -EINVAL; goto out_sem; } ret = nilfs_sufile_get_header_block(sufile, &header_bh); if (ret < 0) goto out_sem; seg = segnumv; blkoff = nilfs_sufile_get_blkoff(sufile, *seg); ret = nilfs_mdt_get_block(sufile, blkoff, create, NULL, &bh); if (ret < 0) goto out_header; for (;;) { dofunc(sufile, *seg, header_bh, bh); if (++seg >= segnumv + nsegs) break; prev_blkoff = blkoff; blkoff = nilfs_sufile_get_blkoff(sufile, *seg); if (blkoff == prev_blkoff) continue; /* get different block */ brelse(bh); ret = nilfs_mdt_get_block(sufile, blkoff, create, NULL, &bh); if (unlikely(ret < 0)) goto out_header; } brelse(bh); out_header: n = seg - segnumv; brelse(header_bh); out_sem: up_write(&NILFS_MDT(sufile)->mi_sem); out: if (ndone) *ndone = n; return ret; } |
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int nilfs_sufile_update(struct inode *sufile, __u64 segnum, int create, void (*dofunc)(struct inode *, __u64, struct buffer_head *, struct buffer_head *)) { struct buffer_head *header_bh, *bh; int ret; if (unlikely(segnum >= nilfs_sufile_get_nsegments(sufile))) { |
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nilfs_msg(sufile->i_sb, KERN_WARNING, "%s: invalid segment number: %llu", __func__, (unsigned long long)segnum); |
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return -EINVAL; } down_write(&NILFS_MDT(sufile)->mi_sem); ret = nilfs_sufile_get_header_block(sufile, &header_bh); if (ret < 0) goto out_sem; ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, create, &bh); if (!ret) { dofunc(sufile, segnum, header_bh, bh); brelse(bh); } brelse(header_bh); out_sem: up_write(&NILFS_MDT(sufile)->mi_sem); return ret; } |
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/** |
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* nilfs_sufile_set_alloc_range - limit range of segment to be allocated * @sufile: inode of segment usage file * @start: minimum segment number of allocatable region (inclusive) * @end: maximum segment number of allocatable region (inclusive) * * Return Value: On success, 0 is returned. On error, one of the * following negative error codes is returned. * * %-ERANGE - invalid segment region */ int nilfs_sufile_set_alloc_range(struct inode *sufile, __u64 start, __u64 end) { struct nilfs_sufile_info *sui = NILFS_SUI(sufile); __u64 nsegs; int ret = -ERANGE; down_write(&NILFS_MDT(sufile)->mi_sem); nsegs = nilfs_sufile_get_nsegments(sufile); if (start <= end && end < nsegs) { sui->allocmin = start; sui->allocmax = end; ret = 0; } up_write(&NILFS_MDT(sufile)->mi_sem); return ret; } /** |
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* nilfs_sufile_alloc - allocate a segment * @sufile: inode of segment usage file * @segnump: pointer to segment number * * Description: nilfs_sufile_alloc() allocates a clean segment. * * Return Value: On success, 0 is returned and the segment number of the * allocated segment is stored in the place pointed by @segnump. On error, one * of the following negative error codes is returned. * * %-EIO - I/O error. * * %-ENOMEM - Insufficient amount of memory available. * * %-ENOSPC - No clean segment left. */ int nilfs_sufile_alloc(struct inode *sufile, __u64 *segnump) { struct buffer_head *header_bh, *su_bh; |
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struct nilfs_sufile_header *header; struct nilfs_segment_usage *su; |
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struct nilfs_sufile_info *sui = NILFS_SUI(sufile); |
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size_t susz = NILFS_MDT(sufile)->mi_entry_size; __u64 segnum, maxsegnum, last_alloc; void *kaddr; |
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unsigned long nsegments, nsus, cnt; |
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int ret, j; |
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down_write(&NILFS_MDT(sufile)->mi_sem); |
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ret = nilfs_sufile_get_header_block(sufile, &header_bh); if (ret < 0) goto out_sem; |
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kaddr = kmap_atomic(header_bh->b_page); |
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header = kaddr + bh_offset(header_bh); |
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last_alloc = le64_to_cpu(header->sh_last_alloc); |
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kunmap_atomic(kaddr); |
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nsegments = nilfs_sufile_get_nsegments(sufile); |
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maxsegnum = sui->allocmax; |
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segnum = last_alloc + 1; |
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if (segnum < sui->allocmin || segnum > sui->allocmax) segnum = sui->allocmin; for (cnt = 0; cnt < nsegments; cnt += nsus) { if (segnum > maxsegnum) { if (cnt < sui->allocmax - sui->allocmin + 1) { /* * wrap around in the limited region. * if allocation started from * sui->allocmin, this never happens. */ segnum = sui->allocmin; maxsegnum = last_alloc; } else if (segnum > sui->allocmin && sui->allocmax + 1 < nsegments) { segnum = sui->allocmax + 1; maxsegnum = nsegments - 1; } else if (sui->allocmin > 0) { segnum = 0; maxsegnum = sui->allocmin - 1; } else { break; /* never happens */ } |
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} |
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trace_nilfs2_segment_usage_check(sufile, segnum, cnt); |
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ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 1, &su_bh); if (ret < 0) goto out_header; |
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kaddr = kmap_atomic(su_bh->b_page); |
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su = nilfs_sufile_block_get_segment_usage( sufile, segnum, su_bh, kaddr); nsus = nilfs_sufile_segment_usages_in_block( sufile, segnum, maxsegnum); for (j = 0; j < nsus; j++, su = (void *)su + susz, segnum++) { if (!nilfs_segment_usage_clean(su)) continue; /* found a clean segment */ |
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nilfs_segment_usage_set_dirty(su); |
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kunmap_atomic(kaddr); |
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|
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kaddr = kmap_atomic(header_bh->b_page); |
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header = kaddr + bh_offset(header_bh); |
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le64_add_cpu(&header->sh_ncleansegs, -1); le64_add_cpu(&header->sh_ndirtysegs, 1); header->sh_last_alloc = cpu_to_le64(segnum); |
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kunmap_atomic(kaddr); |
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|
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sui->ncleansegs--; |
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mark_buffer_dirty(header_bh); mark_buffer_dirty(su_bh); |
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nilfs_mdt_mark_dirty(sufile); brelse(su_bh); *segnump = segnum; |
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trace_nilfs2_segment_usage_allocated(sufile, segnum); |
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goto out_header; } |
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kunmap_atomic(kaddr); |
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brelse(su_bh); } /* no segments left */ ret = -ENOSPC; out_header: brelse(header_bh); out_sem: up_write(&NILFS_MDT(sufile)->mi_sem); return ret; } |
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void nilfs_sufile_do_cancel_free(struct inode *sufile, __u64 segnum, struct buffer_head *header_bh, struct buffer_head *su_bh) |
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{ |
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struct nilfs_segment_usage *su; void *kaddr; |
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|
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kaddr = kmap_atomic(su_bh->b_page); |
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su = nilfs_sufile_block_get_segment_usage(sufile, segnum, su_bh, kaddr); |
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if (unlikely(!nilfs_segment_usage_clean(su))) { |
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nilfs_msg(sufile->i_sb, KERN_WARNING, "%s: segment %llu must be clean", __func__, (unsigned long long)segnum); |
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kunmap_atomic(kaddr); |
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return; |
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} nilfs_segment_usage_set_dirty(su); |
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kunmap_atomic(kaddr); |
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|
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nilfs_sufile_mod_counter(header_bh, -1, 1); |
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NILFS_SUI(sufile)->ncleansegs--; |
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mark_buffer_dirty(su_bh); |
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nilfs_mdt_mark_dirty(sufile); |
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} |
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void nilfs_sufile_do_scrap(struct inode *sufile, __u64 segnum, struct buffer_head *header_bh, struct buffer_head *su_bh) { struct nilfs_segment_usage *su; void *kaddr; int clean, dirty; |
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kaddr = kmap_atomic(su_bh->b_page); |
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su = nilfs_sufile_block_get_segment_usage(sufile, segnum, su_bh, kaddr); |
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if (su->su_flags == cpu_to_le32(BIT(NILFS_SEGMENT_USAGE_DIRTY)) && |
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su->su_nblocks == cpu_to_le32(0)) { |
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kunmap_atomic(kaddr); |
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return; } clean = nilfs_segment_usage_clean(su); dirty = nilfs_segment_usage_dirty(su); /* make the segment garbage */ su->su_lastmod = cpu_to_le64(0); su->su_nblocks = cpu_to_le32(0); |
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su->su_flags = cpu_to_le32(BIT(NILFS_SEGMENT_USAGE_DIRTY)); |
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kunmap_atomic(kaddr); |
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nilfs_sufile_mod_counter(header_bh, clean ? (u64)-1 : 0, dirty ? 0 : 1); |
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NILFS_SUI(sufile)->ncleansegs -= clean; |
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mark_buffer_dirty(su_bh); |
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nilfs_mdt_mark_dirty(sufile); } |
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void nilfs_sufile_do_free(struct inode *sufile, __u64 segnum, struct buffer_head *header_bh, struct buffer_head *su_bh) |
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{ |
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struct nilfs_segment_usage *su; void *kaddr; |
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int sudirty; |
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|
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kaddr = kmap_atomic(su_bh->b_page); |
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su = nilfs_sufile_block_get_segment_usage(sufile, segnum, su_bh, kaddr); if (nilfs_segment_usage_clean(su)) { |
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nilfs_msg(sufile->i_sb, KERN_WARNING, "%s: segment %llu is already clean", __func__, (unsigned long long)segnum); |
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kunmap_atomic(kaddr); |
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return; |
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} |
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WARN_ON(nilfs_segment_usage_error(su)); WARN_ON(!nilfs_segment_usage_dirty(su)); |
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|
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sudirty = nilfs_segment_usage_dirty(su); nilfs_segment_usage_set_clean(su); |
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kunmap_atomic(kaddr); |
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mark_buffer_dirty(su_bh); |
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|
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nilfs_sufile_mod_counter(header_bh, 1, sudirty ? (u64)-1 : 0); |
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NILFS_SUI(sufile)->ncleansegs++; |
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nilfs_mdt_mark_dirty(sufile); |
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trace_nilfs2_segment_usage_freed(sufile, segnum); |
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} /** |
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* nilfs_sufile_mark_dirty - mark the buffer having a segment usage dirty * @sufile: inode of segment usage file * @segnum: segment number */ int nilfs_sufile_mark_dirty(struct inode *sufile, __u64 segnum) { struct buffer_head *bh; int ret; ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 0, &bh); if (!ret) { |
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mark_buffer_dirty(bh); |
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nilfs_mdt_mark_dirty(sufile); brelse(bh); } return ret; } /** |
071ec54dd nilfs2: move rout... |
493 494 495 496 497 498 499 |
* nilfs_sufile_set_segment_usage - set usage of a segment * @sufile: inode of segment usage file * @segnum: segment number * @nblocks: number of live blocks in the segment * @modtime: modification time (option) */ int nilfs_sufile_set_segment_usage(struct inode *sufile, __u64 segnum, |
fb04b91bc nilfs2: use time6... |
500 |
unsigned long nblocks, time64_t modtime) |
071ec54dd nilfs2: move rout... |
501 502 503 504 505 506 507 508 509 510 |
{ 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; |
7b9c0976a nilfs2: remove th... |
511 |
kaddr = kmap_atomic(bh->b_page); |
071ec54dd nilfs2: move rout... |
512 513 514 515 516 |
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); |
7b9c0976a nilfs2: remove th... |
517 |
kunmap_atomic(kaddr); |
071ec54dd nilfs2: move rout... |
518 |
|
5fc7b1417 nilfs2: use mark_... |
519 |
mark_buffer_dirty(bh); |
071ec54dd nilfs2: move rout... |
520 521 522 523 524 525 526 527 528 |
nilfs_mdt_mark_dirty(sufile); brelse(bh); out_sem: up_write(&NILFS_MDT(sufile)->mi_sem); return ret; } /** |
6c98cd4ec nilfs2: segment u... |
529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 |
* nilfs_sufile_get_stat - get segment usage statistics * @sufile: inode of segment usage file * @stat: pointer to a structure of segment usage statistics * * Description: nilfs_sufile_get_stat() returns information about segment * usage. * * Return Value: On success, 0 is returned, and segment usage information is * stored in the place pointed by @stat. On error, one of the following * negative error codes is returned. * * %-EIO - I/O error. * * %-ENOMEM - Insufficient amount of memory available. */ int nilfs_sufile_get_stat(struct inode *sufile, struct nilfs_sustat *sustat) { struct buffer_head *header_bh; struct nilfs_sufile_header *header; |
0ef28f9ae nilfs2: get rid o... |
548 |
struct the_nilfs *nilfs = sufile->i_sb->s_fs_info; |
6c98cd4ec nilfs2: segment u... |
549 550 551 552 553 554 555 556 |
void *kaddr; int ret; down_read(&NILFS_MDT(sufile)->mi_sem); ret = nilfs_sufile_get_header_block(sufile, &header_bh); if (ret < 0) goto out_sem; |
7b9c0976a nilfs2: remove th... |
557 |
kaddr = kmap_atomic(header_bh->b_page); |
7b16c8a21 nilfs2: unfold ni... |
558 |
header = kaddr + bh_offset(header_bh); |
6c98cd4ec nilfs2: segment u... |
559 560 561 |
sustat->ss_nsegs = nilfs_sufile_get_nsegments(sufile); sustat->ss_ncleansegs = le64_to_cpu(header->sh_ncleansegs); sustat->ss_ndirtysegs = le64_to_cpu(header->sh_ndirtysegs); |
2c2e52fc4 nilfs2: extend ni... |
562 563 564 565 566 |
sustat->ss_ctime = nilfs->ns_ctime; sustat->ss_nongc_ctime = nilfs->ns_nongc_ctime; spin_lock(&nilfs->ns_last_segment_lock); sustat->ss_prot_seq = nilfs->ns_prot_seq; spin_unlock(&nilfs->ns_last_segment_lock); |
7b9c0976a nilfs2: remove th... |
567 |
kunmap_atomic(kaddr); |
6c98cd4ec nilfs2: segment u... |
568 569 570 571 572 573 |
brelse(header_bh); out_sem: up_read(&NILFS_MDT(sufile)->mi_sem); return ret; } |
a703018f7 nilfs2: segment u... |
574 575 576 |
void nilfs_sufile_do_set_error(struct inode *sufile, __u64 segnum, struct buffer_head *header_bh, struct buffer_head *su_bh) |
6c98cd4ec nilfs2: segment u... |
577 |
{ |
6c98cd4ec nilfs2: segment u... |
578 |
struct nilfs_segment_usage *su; |
6c98cd4ec nilfs2: segment u... |
579 |
void *kaddr; |
a703018f7 nilfs2: segment u... |
580 |
int suclean; |
6c98cd4ec nilfs2: segment u... |
581 |
|
7b9c0976a nilfs2: remove th... |
582 |
kaddr = kmap_atomic(su_bh->b_page); |
6c98cd4ec nilfs2: segment u... |
583 584 |
su = nilfs_sufile_block_get_segment_usage(sufile, segnum, su_bh, kaddr); if (nilfs_segment_usage_error(su)) { |
7b9c0976a nilfs2: remove th... |
585 |
kunmap_atomic(kaddr); |
a703018f7 nilfs2: segment u... |
586 |
return; |
6c98cd4ec nilfs2: segment u... |
587 |
} |
88072faf9 nilfs2: fix wrong... |
588 |
suclean = nilfs_segment_usage_clean(su); |
6c98cd4ec nilfs2: segment u... |
589 |
nilfs_segment_usage_set_error(su); |
7b9c0976a nilfs2: remove th... |
590 |
kunmap_atomic(kaddr); |
6c98cd4ec nilfs2: segment u... |
591 |
|
aa474a220 nilfs2: add local... |
592 |
if (suclean) { |
a703018f7 nilfs2: segment u... |
593 |
nilfs_sufile_mod_counter(header_bh, -1, 0); |
aa474a220 nilfs2: add local... |
594 595 |
NILFS_SUI(sufile)->ncleansegs--; } |
5fc7b1417 nilfs2: use mark_... |
596 |
mark_buffer_dirty(su_bh); |
6c98cd4ec nilfs2: segment u... |
597 |
nilfs_mdt_mark_dirty(sufile); |
6c98cd4ec nilfs2: segment u... |
598 599 600 |
} /** |
4d685f930 nilfs2: align blo... |
601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 |
* nilfs_sufile_truncate_range - truncate range of segment array * @sufile: inode of segment usage file * @start: start segment number (inclusive) * @end: end segment number (inclusive) * * Return Value: On success, 0 is returned. On error, one of the * following negative error codes is returned. * * %-EIO - I/O error. * * %-ENOMEM - Insufficient amount of memory available. * * %-EINVAL - Invalid number of segments specified * * %-EBUSY - Dirty or active segments are present in the range */ |
78eb64c24 nilfs2: add trunc... |
617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 |
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; /* hole */ continue; } |
7b9c0976a nilfs2: remove th... |
659 |
kaddr = kmap_atomic(su_bh->b_page); |
78eb64c24 nilfs2: add trunc... |
660 661 662 663 664 |
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) & |
4ce5c3426 nilfs2: use BIT()... |
665 |
~BIT(NILFS_SEGMENT_USAGE_ERROR)) || |
78eb64c24 nilfs2: add trunc... |
666 667 |
nilfs_segment_is_active(nilfs, segnum + j)) { ret = -EBUSY; |
7b9c0976a nilfs2: remove th... |
668 |
kunmap_atomic(kaddr); |
78eb64c24 nilfs2: add trunc... |
669 670 671 672 673 674 675 676 677 678 679 |
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++; } } |
7b9c0976a nilfs2: remove th... |
680 |
kunmap_atomic(kaddr); |
78eb64c24 nilfs2: add trunc... |
681 |
if (nc > 0) { |
5fc7b1417 nilfs2: use mark_... |
682 |
mark_buffer_dirty(su_bh); |
78eb64c24 nilfs2: add trunc... |
683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 |
ncleaned += nc; } brelse(su_bh); if (n == segusages_per_block) { /* make hole */ 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; } /** |
4e33f9eab nilfs2: implement... |
706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 |
* nilfs_sufile_resize - resize segment array * @sufile: inode of segment usage file * @newnsegs: new number of segments * * Return Value: On success, 0 is returned. On error, one of the * following negative error codes is returned. * * %-EIO - I/O error. * * %-ENOMEM - Insufficient amount of memory available. * * %-ENOSPC - Enough free space is not left for shrinking * * %-EBUSY - Dirty or active segments exist in the region to be truncated */ int nilfs_sufile_resize(struct inode *sufile, __u64 newnsegs) { struct the_nilfs *nilfs = sufile->i_sb->s_fs_info; struct buffer_head *header_bh; struct nilfs_sufile_header *header; struct nilfs_sufile_info *sui = NILFS_SUI(sufile); void *kaddr; unsigned long nsegs, nrsvsegs; int ret = 0; down_write(&NILFS_MDT(sufile)->mi_sem); nsegs = nilfs_sufile_get_nsegments(sufile); if (nsegs == newnsegs) goto out; ret = -ENOSPC; nrsvsegs = nilfs_nrsvsegs(nilfs, newnsegs); if (newnsegs < nsegs && nsegs - newnsegs + nrsvsegs > sui->ncleansegs) goto out; ret = nilfs_sufile_get_header_block(sufile, &header_bh); if (ret < 0) goto out; if (newnsegs > nsegs) { sui->ncleansegs += newnsegs - nsegs; } else /* newnsegs < nsegs */ { ret = nilfs_sufile_truncate_range(sufile, newnsegs, nsegs - 1); if (ret < 0) goto out_header; sui->ncleansegs -= nsegs - newnsegs; } |
7b9c0976a nilfs2: remove th... |
755 |
kaddr = kmap_atomic(header_bh->b_page); |
4e33f9eab nilfs2: implement... |
756 757 |
header = kaddr + bh_offset(header_bh); header->sh_ncleansegs = cpu_to_le64(sui->ncleansegs); |
7b9c0976a nilfs2: remove th... |
758 |
kunmap_atomic(kaddr); |
4e33f9eab nilfs2: implement... |
759 |
|
5fc7b1417 nilfs2: use mark_... |
760 |
mark_buffer_dirty(header_bh); |
4e33f9eab nilfs2: implement... |
761 762 763 764 765 766 767 768 769 770 771 |
nilfs_mdt_mark_dirty(sufile); nilfs_set_nsegments(nilfs, newnsegs); out_header: brelse(header_bh); out: up_write(&NILFS_MDT(sufile)->mi_sem); return ret; } /** |
6c98cd4ec nilfs2: segment u... |
772 773 774 |
* nilfs_sufile_get_suinfo - * @sufile: inode of segment usage file * @segnum: segment number to start looking |
003ff182f nilfs2: allow fut... |
775 776 |
* @buf: array of suinfo * @sisz: byte size of suinfo |
6c98cd4ec nilfs2: segment u... |
777 778 779 780 781 782 783 784 785 786 787 |
* @nsi: size of suinfo array * * Description: * * Return Value: On success, 0 is returned and .... On error, one of the * following negative error codes is returned. * * %-EIO - I/O error. * * %-ENOMEM - Insufficient amount of memory available. */ |
003ff182f nilfs2: allow fut... |
788 |
ssize_t nilfs_sufile_get_suinfo(struct inode *sufile, __u64 segnum, void *buf, |
f19e78dee nilfs2: remove sp... |
789 |
unsigned int sisz, size_t nsi) |
6c98cd4ec nilfs2: segment u... |
790 791 792 |
{ struct buffer_head *su_bh; struct nilfs_segment_usage *su; |
003ff182f nilfs2: allow fut... |
793 |
struct nilfs_suinfo *si = buf; |
6c98cd4ec nilfs2: segment u... |
794 |
size_t susz = NILFS_MDT(sufile)->mi_entry_size; |
0ef28f9ae nilfs2: get rid o... |
795 |
struct the_nilfs *nilfs = sufile->i_sb->s_fs_info; |
6c98cd4ec nilfs2: segment u... |
796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 |
void *kaddr; unsigned long nsegs, segusages_per_block; ssize_t n; int ret, i, j; down_read(&NILFS_MDT(sufile)->mi_sem); segusages_per_block = nilfs_sufile_segment_usages_per_block(sufile); nsegs = min_t(unsigned long, nilfs_sufile_get_nsegments(sufile) - segnum, nsi); for (i = 0; i < nsegs; i += n, segnum += n) { n = min_t(unsigned long, segusages_per_block - nilfs_sufile_get_offset(sufile, segnum), nsegs - i); ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 0, &su_bh); if (ret < 0) { if (ret != -ENOENT) goto out; /* hole */ |
003ff182f nilfs2: allow fut... |
818 819 |
memset(si, 0, sisz * n); si = (void *)si + sisz * n; |
6c98cd4ec nilfs2: segment u... |
820 821 |
continue; } |
7b9c0976a nilfs2: remove th... |
822 |
kaddr = kmap_atomic(su_bh->b_page); |
6c98cd4ec nilfs2: segment u... |
823 824 |
su = nilfs_sufile_block_get_segment_usage( sufile, segnum, su_bh, kaddr); |
003ff182f nilfs2: allow fut... |
825 826 827 828 829 |
for (j = 0; j < n; j++, su = (void *)su + susz, si = (void *)si + sisz) { si->sui_lastmod = le64_to_cpu(su->su_lastmod); si->sui_nblocks = le32_to_cpu(su->su_nblocks); si->sui_flags = le32_to_cpu(su->su_flags) & |
4ce5c3426 nilfs2: use BIT()... |
830 |
~BIT(NILFS_SEGMENT_USAGE_ACTIVE); |
3efb55b49 nilfs2: simplify ... |
831 |
if (nilfs_segment_is_active(nilfs, segnum + j)) |
003ff182f nilfs2: allow fut... |
832 |
si->sui_flags |= |
4ce5c3426 nilfs2: use BIT()... |
833 |
BIT(NILFS_SEGMENT_USAGE_ACTIVE); |
6c98cd4ec nilfs2: segment u... |
834 |
} |
7b9c0976a nilfs2: remove th... |
835 |
kunmap_atomic(kaddr); |
6c98cd4ec nilfs2: segment u... |
836 837 838 839 840 841 842 843 |
brelse(su_bh); } ret = nsegs; out: up_read(&NILFS_MDT(sufile)->mi_sem); return ret; } |
79739565e nilfs2: separate ... |
844 845 |
/** |
00e9ffcd2 nilfs2: add nilfs... |
846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 |
* nilfs_sufile_set_suinfo - sets segment usage info * @sufile: inode of segment usage file * @buf: array of suinfo_update * @supsz: byte size of suinfo_update * @nsup: size of suinfo_update array * * Description: Takes an array of nilfs_suinfo_update structs and updates * segment usage accordingly. Only the fields indicated by the sup_flags * are updated. * * Return Value: On success, 0 is returned. On error, one of the * following negative error codes is returned. * * %-EIO - I/O error. * * %-ENOMEM - Insufficient amount of memory available. * * %-EINVAL - Invalid values in input (segment number, flags or nblocks) */ ssize_t nilfs_sufile_set_suinfo(struct inode *sufile, void *buf, |
f19e78dee nilfs2: remove sp... |
866 |
unsigned int supsz, size_t nsup) |
00e9ffcd2 nilfs2: add nilfs... |
867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 |
{ struct the_nilfs *nilfs = sufile->i_sb->s_fs_info; struct buffer_head *header_bh, *bh; struct nilfs_suinfo_update *sup, *supend = buf + supsz * nsup; struct nilfs_segment_usage *su; void *kaddr; unsigned long blkoff, prev_blkoff; int cleansi, cleansu, dirtysi, dirtysu; long ncleaned = 0, ndirtied = 0; int ret = 0; if (unlikely(nsup == 0)) return ret; for (sup = buf; sup < supend; sup = (void *)sup + supsz) { if (sup->sup_segnum >= nilfs->ns_nsegments || (sup->sup_flags & (~0UL << __NR_NILFS_SUINFO_UPDATE_FIELDS)) || (nilfs_suinfo_update_nblocks(sup) && sup->sup_sui.sui_nblocks > nilfs->ns_blocks_per_segment)) return -EINVAL; } down_write(&NILFS_MDT(sufile)->mi_sem); ret = nilfs_sufile_get_header_block(sufile, &header_bh); if (ret < 0) goto out_sem; sup = buf; blkoff = nilfs_sufile_get_blkoff(sufile, sup->sup_segnum); ret = nilfs_mdt_get_block(sufile, blkoff, 1, NULL, &bh); if (ret < 0) goto out_header; for (;;) { kaddr = kmap_atomic(bh->b_page); su = nilfs_sufile_block_get_segment_usage( sufile, sup->sup_segnum, bh, kaddr); if (nilfs_suinfo_update_lastmod(sup)) su->su_lastmod = cpu_to_le64(sup->sup_sui.sui_lastmod); if (nilfs_suinfo_update_nblocks(sup)) su->su_nblocks = cpu_to_le32(sup->sup_sui.sui_nblocks); if (nilfs_suinfo_update_flags(sup)) { /* * Active flag is a virtual flag projected by running * nilfs kernel code - drop it not to write it to * disk. */ sup->sup_sui.sui_flags &= |
4ce5c3426 nilfs2: use BIT()... |
921 |
~BIT(NILFS_SEGMENT_USAGE_ACTIVE); |
00e9ffcd2 nilfs2: add nilfs... |
922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 |
cleansi = nilfs_suinfo_clean(&sup->sup_sui); cleansu = nilfs_segment_usage_clean(su); dirtysi = nilfs_suinfo_dirty(&sup->sup_sui); dirtysu = nilfs_segment_usage_dirty(su); if (cleansi && !cleansu) ++ncleaned; else if (!cleansi && cleansu) --ncleaned; if (dirtysi && !dirtysu) ++ndirtied; else if (!dirtysi && dirtysu) --ndirtied; su->su_flags = cpu_to_le32(sup->sup_sui.sui_flags); } kunmap_atomic(kaddr); sup = (void *)sup + supsz; if (sup >= supend) break; prev_blkoff = blkoff; blkoff = nilfs_sufile_get_blkoff(sufile, sup->sup_segnum); if (blkoff == prev_blkoff) continue; /* get different block */ mark_buffer_dirty(bh); put_bh(bh); ret = nilfs_mdt_get_block(sufile, blkoff, 1, NULL, &bh); if (unlikely(ret < 0)) goto out_mark; } mark_buffer_dirty(bh); put_bh(bh); out_mark: if (ncleaned || ndirtied) { nilfs_sufile_mod_counter(header_bh, (u64)ncleaned, (u64)ndirtied); NILFS_SUI(sufile)->ncleansegs += ncleaned; } nilfs_mdt_mark_dirty(sufile); out_header: put_bh(header_bh); out_sem: up_write(&NILFS_MDT(sufile)->mi_sem); return ret; } /** |
82e11e857 nilfs2: add nilfs... |
977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 |
* nilfs_sufile_trim_fs() - trim ioctl handle function * @sufile: inode of segment usage file * @range: fstrim_range structure * * start: First Byte to trim * len: number of Bytes to trim from start * minlen: minimum extent length in Bytes * * Decription: nilfs_sufile_trim_fs goes through all segments containing bytes * from start to start+len. start is rounded up to the next block boundary * and start+len is rounded down. For each clean segment blkdev_issue_discard * function is invoked. * * Return Value: On success, 0 is returned or negative error code, otherwise. */ int nilfs_sufile_trim_fs(struct inode *sufile, struct fstrim_range *range) { struct the_nilfs *nilfs = sufile->i_sb->s_fs_info; struct buffer_head *su_bh; struct nilfs_segment_usage *su; void *kaddr; size_t n, i, susz = NILFS_MDT(sufile)->mi_entry_size; sector_t seg_start, seg_end, start_block, end_block; sector_t start = 0, nblocks = 0; u64 segnum, segnum_end, minlen, len, max_blocks, ndiscarded = 0; int ret = 0; unsigned int sects_per_block; sects_per_block = (1 << nilfs->ns_blocksize_bits) / bdev_logical_block_size(nilfs->ns_bdev); len = range->len >> nilfs->ns_blocksize_bits; minlen = range->minlen >> nilfs->ns_blocksize_bits; max_blocks = ((u64)nilfs->ns_nsegments * nilfs->ns_blocks_per_segment); if (!len || range->start >= max_blocks << nilfs->ns_blocksize_bits) return -EINVAL; start_block = (range->start + nilfs->ns_blocksize - 1) >> nilfs->ns_blocksize_bits; /* * range->len can be very large (actually, it is set to * ULLONG_MAX by default) - truncate upper end of the range * carefully so as not to overflow. */ if (max_blocks - start_block < len) end_block = max_blocks - 1; else end_block = start_block + len - 1; segnum = nilfs_get_segnum_of_block(nilfs, start_block); segnum_end = nilfs_get_segnum_of_block(nilfs, end_block); down_read(&NILFS_MDT(sufile)->mi_sem); while (segnum <= segnum_end) { n = nilfs_sufile_segment_usages_in_block(sufile, segnum, segnum_end); ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 0, &su_bh); if (ret < 0) { if (ret != -ENOENT) goto out_sem; /* hole */ segnum += n; continue; } kaddr = kmap_atomic(su_bh->b_page); su = nilfs_sufile_block_get_segment_usage(sufile, segnum, su_bh, kaddr); for (i = 0; i < n; ++i, ++segnum, su = (void *)su + susz) { if (!nilfs_segment_usage_clean(su)) continue; nilfs_get_segment_range(nilfs, segnum, &seg_start, &seg_end); if (!nblocks) { /* start new extent */ start = seg_start; nblocks = seg_end - seg_start + 1; continue; } if (start + nblocks == seg_start) { /* add to previous extent */ nblocks += seg_end - seg_start + 1; continue; } /* discard previous extent */ if (start < start_block) { nblocks -= start_block - start; start = start_block; } if (nblocks >= minlen) { kunmap_atomic(kaddr); ret = blkdev_issue_discard(nilfs->ns_bdev, start * sects_per_block, nblocks * sects_per_block, GFP_NOFS, 0); if (ret < 0) { put_bh(su_bh); goto out_sem; } ndiscarded += nblocks; kaddr = kmap_atomic(su_bh->b_page); su = nilfs_sufile_block_get_segment_usage( sufile, segnum, su_bh, kaddr); } /* start new extent */ start = seg_start; nblocks = seg_end - seg_start + 1; } kunmap_atomic(kaddr); put_bh(su_bh); } if (nblocks) { /* discard last extent */ if (start < start_block) { nblocks -= start_block - start; start = start_block; } if (start + nblocks > end_block + 1) nblocks = end_block - start + 1; if (nblocks >= minlen) { ret = blkdev_issue_discard(nilfs->ns_bdev, start * sects_per_block, nblocks * sects_per_block, GFP_NOFS, 0); if (!ret) ndiscarded += nblocks; } } out_sem: up_read(&NILFS_MDT(sufile)->mi_sem); range->len = ndiscarded << nilfs->ns_blocksize_bits; return ret; } /** |
f1e89c86f nilfs2: use iget ... |
1129 1130 1131 |
* nilfs_sufile_read - read or get sufile inode * @sb: super block instance * @susize: size of a segment usage entry |
8707df384 nilfs2: separate ... |
1132 |
* @raw_inode: on-disk sufile inode |
f1e89c86f nilfs2: use iget ... |
1133 |
* @inodep: buffer to store the inode |
8707df384 nilfs2: separate ... |
1134 |
*/ |
f1e89c86f nilfs2: use iget ... |
1135 1136 |
int nilfs_sufile_read(struct super_block *sb, size_t susize, struct nilfs_inode *raw_inode, struct inode **inodep) |
8707df384 nilfs2: separate ... |
1137 |
{ |
f1e89c86f nilfs2: use iget ... |
1138 1139 |
struct inode *sufile; struct nilfs_sufile_info *sui; |
aa474a220 nilfs2: add local... |
1140 1141 1142 |
struct buffer_head *header_bh; struct nilfs_sufile_header *header; void *kaddr; |
f1e89c86f nilfs2: use iget ... |
1143 |
int err; |
aa474a220 nilfs2: add local... |
1144 |
|
0ec060d18 nilfs2: verify me... |
1145 |
if (susize > sb->s_blocksize) { |
feee880fa nilfs2: reduce ba... |
1146 1147 |
nilfs_msg(sb, KERN_ERR, "too large segment usage size: %zu bytes", susize); |
0ec060d18 nilfs2: verify me... |
1148 1149 |
return -EINVAL; } else if (susize < NILFS_MIN_SEGMENT_USAGE_SIZE) { |
feee880fa nilfs2: reduce ba... |
1150 1151 |
nilfs_msg(sb, KERN_ERR, "too small segment usage size: %zu bytes", susize); |
0ec060d18 nilfs2: verify me... |
1152 1153 |
return -EINVAL; } |
f1e89c86f nilfs2: use iget ... |
1154 1155 1156 1157 1158 |
sufile = nilfs_iget_locked(sb, NULL, NILFS_SUFILE_INO); if (unlikely(!sufile)) return -ENOMEM; if (!(sufile->i_state & I_NEW)) goto out; |
aa474a220 nilfs2: add local... |
1159 |
|
f1e89c86f nilfs2: use iget ... |
1160 1161 1162 |
err = nilfs_mdt_init(sufile, NILFS_MDT_GFP, sizeof(*sui)); if (err) goto failed; |
8707df384 nilfs2: separate ... |
1163 |
|
f1e89c86f nilfs2: use iget ... |
1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 |
nilfs_mdt_set_entry_size(sufile, susize, sizeof(struct nilfs_sufile_header)); err = nilfs_read_inode_common(sufile, raw_inode); if (err) goto failed; err = nilfs_sufile_get_header_block(sufile, &header_bh); if (err) goto failed; |
79739565e nilfs2: separate ... |
1174 |
|
f1e89c86f nilfs2: use iget ... |
1175 |
sui = NILFS_SUI(sufile); |
7b9c0976a nilfs2: remove th... |
1176 |
kaddr = kmap_atomic(header_bh->b_page); |
f1e89c86f nilfs2: use iget ... |
1177 1178 |
header = kaddr + bh_offset(header_bh); sui->ncleansegs = le64_to_cpu(header->sh_ncleansegs); |
7b9c0976a nilfs2: remove th... |
1179 |
kunmap_atomic(kaddr); |
f1e89c86f nilfs2: use iget ... |
1180 |
brelse(header_bh); |
619205da5 nilfs2: add ioctl... |
1181 1182 |
sui->allocmax = nilfs_sufile_get_nsegments(sufile) - 1; sui->allocmin = 0; |
f1e89c86f nilfs2: use iget ... |
1183 1184 1185 1186 1187 1188 1189 |
unlock_new_inode(sufile); out: *inodep = sufile; return 0; failed: iget_failed(sufile); return err; |
79739565e nilfs2: separate ... |
1190 |
} |