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- #include <linux/slab.h>
- #include <linux/pagemap.h>
- #include <linux/list_sort.h>
- #include "ubifs.h"
- #define SOFT_LEBS_LIMIT 4
- #define HARD_LEBS_LIMIT 32
- static int switch_gc_head(struct ubifs_info *c)
- {
- int err, gc_lnum = c->gc_lnum;
- struct ubifs_wbuf *wbuf = &c->jheads[GCHD].wbuf;
- ubifs_assert(gc_lnum != -1);
- dbg_gc("switch GC head from LEB %d:%d to LEB %d (waste %d bytes)",
- wbuf->lnum, wbuf->offs + wbuf->used, gc_lnum,
- c->leb_size - wbuf->offs - wbuf->used);
- err = ubifs_wbuf_sync_nolock(wbuf);
- if (err)
- return err;
-
- err = ubifs_leb_unmap(c, gc_lnum);
- if (err)
- return err;
- err = ubifs_add_bud_to_log(c, GCHD, gc_lnum, 0);
- if (err)
- return err;
- c->gc_lnum = -1;
- err = ubifs_wbuf_seek_nolock(wbuf, gc_lnum, 0);
- return err;
- }
- static int data_nodes_cmp(void *priv, struct list_head *a, struct list_head *b)
- {
- ino_t inuma, inumb;
- struct ubifs_info *c = priv;
- struct ubifs_scan_node *sa, *sb;
- cond_resched();
- if (a == b)
- return 0;
- sa = list_entry(a, struct ubifs_scan_node, list);
- sb = list_entry(b, struct ubifs_scan_node, list);
- ubifs_assert(key_type(c, &sa->key) == UBIFS_DATA_KEY);
- ubifs_assert(key_type(c, &sb->key) == UBIFS_DATA_KEY);
- ubifs_assert(sa->type == UBIFS_DATA_NODE);
- ubifs_assert(sb->type == UBIFS_DATA_NODE);
- inuma = key_inum(c, &sa->key);
- inumb = key_inum(c, &sb->key);
- if (inuma == inumb) {
- unsigned int blka = key_block(c, &sa->key);
- unsigned int blkb = key_block(c, &sb->key);
- if (blka <= blkb)
- return -1;
- } else if (inuma <= inumb)
- return -1;
- return 1;
- }
- static int nondata_nodes_cmp(void *priv, struct list_head *a,
- struct list_head *b)
- {
- ino_t inuma, inumb;
- struct ubifs_info *c = priv;
- struct ubifs_scan_node *sa, *sb;
- cond_resched();
- if (a == b)
- return 0;
- sa = list_entry(a, struct ubifs_scan_node, list);
- sb = list_entry(b, struct ubifs_scan_node, list);
- ubifs_assert(key_type(c, &sa->key) != UBIFS_DATA_KEY &&
- key_type(c, &sb->key) != UBIFS_DATA_KEY);
- ubifs_assert(sa->type != UBIFS_DATA_NODE &&
- sb->type != UBIFS_DATA_NODE);
-
- if (sa->type == UBIFS_INO_NODE) {
- if (sb->type == UBIFS_INO_NODE)
- return sb->len - sa->len;
- return -1;
- }
- if (sb->type == UBIFS_INO_NODE)
- return 1;
- ubifs_assert(key_type(c, &sa->key) == UBIFS_DENT_KEY ||
- key_type(c, &sa->key) == UBIFS_XENT_KEY);
- ubifs_assert(key_type(c, &sb->key) == UBIFS_DENT_KEY ||
- key_type(c, &sb->key) == UBIFS_XENT_KEY);
- ubifs_assert(sa->type == UBIFS_DENT_NODE ||
- sa->type == UBIFS_XENT_NODE);
- ubifs_assert(sb->type == UBIFS_DENT_NODE ||
- sb->type == UBIFS_XENT_NODE);
- inuma = key_inum(c, &sa->key);
- inumb = key_inum(c, &sb->key);
- if (inuma == inumb) {
- uint32_t hasha = key_hash(c, &sa->key);
- uint32_t hashb = key_hash(c, &sb->key);
- if (hasha <= hashb)
- return -1;
- } else if (inuma <= inumb)
- return -1;
- return 1;
- }
- static int sort_nodes(struct ubifs_info *c, struct ubifs_scan_leb *sleb,
- struct list_head *nondata, int *min)
- {
- int err;
- struct ubifs_scan_node *snod, *tmp;
- *min = INT_MAX;
-
- list_for_each_entry_safe(snod, tmp, &sleb->nodes, list) {
- ubifs_assert(snod->type == UBIFS_INO_NODE ||
- snod->type == UBIFS_DATA_NODE ||
- snod->type == UBIFS_DENT_NODE ||
- snod->type == UBIFS_XENT_NODE ||
- snod->type == UBIFS_TRUN_NODE);
- if (snod->type != UBIFS_INO_NODE &&
- snod->type != UBIFS_DATA_NODE &&
- snod->type != UBIFS_DENT_NODE &&
- snod->type != UBIFS_XENT_NODE) {
-
- list_del(&snod->list);
- kfree(snod);
- continue;
- }
- ubifs_assert(key_type(c, &snod->key) == UBIFS_DATA_KEY ||
- key_type(c, &snod->key) == UBIFS_INO_KEY ||
- key_type(c, &snod->key) == UBIFS_DENT_KEY ||
- key_type(c, &snod->key) == UBIFS_XENT_KEY);
- err = ubifs_tnc_has_node(c, &snod->key, 0, sleb->lnum,
- snod->offs, 0);
- if (err < 0)
- return err;
- if (!err) {
-
- list_del(&snod->list);
- kfree(snod);
- continue;
- }
- if (snod->len < *min)
- *min = snod->len;
- if (key_type(c, &snod->key) != UBIFS_DATA_KEY)
- list_move_tail(&snod->list, nondata);
- }
-
- list_sort(c, &sleb->nodes, &data_nodes_cmp);
- list_sort(c, nondata, &nondata_nodes_cmp);
- err = dbg_check_data_nodes_order(c, &sleb->nodes);
- if (err)
- return err;
- err = dbg_check_nondata_nodes_order(c, nondata);
- if (err)
- return err;
- return 0;
- }
- static int move_node(struct ubifs_info *c, struct ubifs_scan_leb *sleb,
- struct ubifs_scan_node *snod, struct ubifs_wbuf *wbuf)
- {
- int err, new_lnum = wbuf->lnum, new_offs = wbuf->offs + wbuf->used;
- cond_resched();
- err = ubifs_wbuf_write_nolock(wbuf, snod->node, snod->len);
- if (err)
- return err;
- err = ubifs_tnc_replace(c, &snod->key, sleb->lnum,
- snod->offs, new_lnum, new_offs,
- snod->len);
- list_del(&snod->list);
- kfree(snod);
- return err;
- }
- static int move_nodes(struct ubifs_info *c, struct ubifs_scan_leb *sleb)
- {
- int err, min;
- LIST_HEAD(nondata);
- struct ubifs_wbuf *wbuf = &c->jheads[GCHD].wbuf;
- if (wbuf->lnum == -1) {
-
- err = switch_gc_head(c);
- if (err)
- return err;
- }
- err = sort_nodes(c, sleb, &nondata, &min);
- if (err)
- goto out;
-
- while (1) {
- int avail;
- struct ubifs_scan_node *snod, *tmp;
-
- list_for_each_entry_safe(snod, tmp, &sleb->nodes, list) {
- avail = c->leb_size - wbuf->offs - wbuf->used;
- if (snod->len > avail)
-
- break;
- err = move_node(c, sleb, snod, wbuf);
- if (err)
- goto out;
- }
-
- list_for_each_entry_safe(snod, tmp, &nondata, list) {
- avail = c->leb_size - wbuf->offs - wbuf->used;
- if (avail < min)
- break;
- if (snod->len > avail) {
-
- if (key_type(c, &snod->key) == UBIFS_DENT_KEY ||
- snod->len == UBIFS_INO_NODE_SZ)
- break;
- continue;
- }
- err = move_node(c, sleb, snod, wbuf);
- if (err)
- goto out;
- }
- if (list_empty(&sleb->nodes) && list_empty(&nondata))
- break;
-
- err = switch_gc_head(c);
- if (err)
- goto out;
- }
- return 0;
- out:
- list_splice_tail(&nondata, &sleb->nodes);
- return err;
- }
- static int gc_sync_wbufs(struct ubifs_info *c)
- {
- int err, i;
- for (i = 0; i < c->jhead_cnt; i++) {
- if (i == GCHD)
- continue;
- err = ubifs_wbuf_sync(&c->jheads[i].wbuf);
- if (err)
- return err;
- }
- return 0;
- }
- int ubifs_garbage_collect_leb(struct ubifs_info *c, struct ubifs_lprops *lp)
- {
- struct ubifs_scan_leb *sleb;
- struct ubifs_scan_node *snod;
- struct ubifs_wbuf *wbuf = &c->jheads[GCHD].wbuf;
- int err = 0, lnum = lp->lnum;
- ubifs_assert(c->gc_lnum != -1 || wbuf->offs + wbuf->used == 0 ||
- c->need_recovery);
- ubifs_assert(c->gc_lnum != lnum);
- ubifs_assert(wbuf->lnum != lnum);
- if (lp->free + lp->dirty == c->leb_size) {
-
- dbg_gc("LEB %d is free, return it", lp->lnum);
- ubifs_assert(!(lp->flags & LPROPS_INDEX));
- if (lp->free != c->leb_size) {
-
- err = gc_sync_wbufs(c);
- if (err)
- return err;
- err = ubifs_change_one_lp(c, lp->lnum, c->leb_size,
- 0, 0, 0, 0);
- if (err)
- return err;
- }
- err = ubifs_leb_unmap(c, lp->lnum);
- if (err)
- return err;
- if (c->gc_lnum == -1) {
- c->gc_lnum = lnum;
- return LEB_RETAINED;
- }
- return LEB_FREED;
- }
-
- sleb = ubifs_scan(c, lnum, 0, c->sbuf, 0);
- if (IS_ERR(sleb))
- return PTR_ERR(sleb);
- ubifs_assert(!list_empty(&sleb->nodes));
- snod = list_entry(sleb->nodes.next, struct ubifs_scan_node, list);
- if (snod->type == UBIFS_IDX_NODE) {
- struct ubifs_gced_idx_leb *idx_gc;
- dbg_gc("indexing LEB %d (free %d, dirty %d)",
- lnum, lp->free, lp->dirty);
- list_for_each_entry(snod, &sleb->nodes, list) {
- struct ubifs_idx_node *idx = snod->node;
- int level = le16_to_cpu(idx->level);
- ubifs_assert(snod->type == UBIFS_IDX_NODE);
- key_read(c, ubifs_idx_key(c, idx), &snod->key);
- err = ubifs_dirty_idx_node(c, &snod->key, level, lnum,
- snod->offs);
- if (err)
- goto out;
- }
- idx_gc = kmalloc(sizeof(struct ubifs_gced_idx_leb), GFP_NOFS);
- if (!idx_gc) {
- err = -ENOMEM;
- goto out;
- }
- idx_gc->lnum = lnum;
- idx_gc->unmap = 0;
- list_add(&idx_gc->list, &c->idx_gc);
-
- err = ubifs_change_one_lp(c, lnum, c->leb_size, 0, 0,
- LPROPS_INDEX, 1);
- if (err)
- goto out;
- err = LEB_FREED_IDX;
- } else {
- dbg_gc("data LEB %d (free %d, dirty %d)",
- lnum, lp->free, lp->dirty);
- err = move_nodes(c, sleb);
- if (err)
- goto out_inc_seq;
- err = gc_sync_wbufs(c);
- if (err)
- goto out_inc_seq;
- err = ubifs_change_one_lp(c, lnum, c->leb_size, 0, 0, 0, 0);
- if (err)
- goto out_inc_seq;
-
- c->gced_lnum = lnum;
- smp_wmb();
- c->gc_seq += 1;
- smp_wmb();
- if (c->gc_lnum == -1) {
- c->gc_lnum = lnum;
- err = LEB_RETAINED;
- } else {
- err = ubifs_wbuf_sync_nolock(wbuf);
- if (err)
- goto out;
- err = ubifs_leb_unmap(c, lnum);
- if (err)
- goto out;
- err = LEB_FREED;
- }
- }
- out:
- ubifs_scan_destroy(sleb);
- return err;
- out_inc_seq:
-
- c->gced_lnum = lnum;
- smp_wmb();
- c->gc_seq += 1;
- smp_wmb();
- goto out;
- }
- int ubifs_garbage_collect(struct ubifs_info *c, int anyway)
- {
- int i, err, ret, min_space = c->dead_wm;
- struct ubifs_lprops lp;
- struct ubifs_wbuf *wbuf = &c->jheads[GCHD].wbuf;
- ubifs_assert_cmt_locked(c);
- ubifs_assert(!c->ro_media && !c->ro_mount);
- if (ubifs_gc_should_commit(c))
- return -EAGAIN;
- mutex_lock_nested(&wbuf->io_mutex, wbuf->jhead);
- if (c->ro_error) {
- ret = -EROFS;
- goto out_unlock;
- }
-
- ubifs_assert(!wbuf->used);
- for (i = 0; ; i++) {
- int space_before, space_after;
- cond_resched();
-
- if (ubifs_gc_should_commit(c)) {
- ret = -EAGAIN;
- break;
- }
- if (i > SOFT_LEBS_LIMIT && !list_empty(&c->idx_gc)) {
-
- dbg_gc("soft limit, some index LEBs GC'ed, -EAGAIN");
- ubifs_commit_required(c);
- ret = -EAGAIN;
- break;
- }
- if (i > HARD_LEBS_LIMIT) {
-
- dbg_gc("hard limit, -ENOSPC");
- ret = -ENOSPC;
- break;
- }
-
- ret = ubifs_find_dirty_leb(c, &lp, min_space, anyway ? 0 : 1);
- if (ret) {
- if (ret == -ENOSPC)
- dbg_gc("no more dirty LEBs");
- break;
- }
- dbg_gc("found LEB %d: free %d, dirty %d, sum %d (min. space %d)",
- lp.lnum, lp.free, lp.dirty, lp.free + lp.dirty,
- min_space);
- space_before = c->leb_size - wbuf->offs - wbuf->used;
- if (wbuf->lnum == -1)
- space_before = 0;
- ret = ubifs_garbage_collect_leb(c, &lp);
- if (ret < 0) {
- if (ret == -EAGAIN) {
-
- err = ubifs_return_leb(c, lp.lnum);
- if (err)
- ret = err;
- break;
- }
- goto out;
- }
- if (ret == LEB_FREED) {
-
- dbg_gc("LEB %d freed, return", lp.lnum);
- ret = lp.lnum;
- break;
- }
- if (ret == LEB_FREED_IDX) {
-
- dbg_gc("indexing LEB %d freed, continue", lp.lnum);
- continue;
- }
- ubifs_assert(ret == LEB_RETAINED);
- space_after = c->leb_size - wbuf->offs - wbuf->used;
- dbg_gc("LEB %d retained, freed %d bytes", lp.lnum,
- space_after - space_before);
- if (space_after > space_before) {
-
- min_space >>= 1;
- if (min_space < c->dead_wm)
- min_space = c->dead_wm;
- continue;
- }
- dbg_gc("did not make progress");
-
- if (i < SOFT_LEBS_LIMIT) {
- dbg_gc("try again");
- continue;
- }
- min_space <<= 1;
- if (min_space > c->dark_wm)
- min_space = c->dark_wm;
- dbg_gc("set min. space to %d", min_space);
- }
- if (ret == -ENOSPC && !list_empty(&c->idx_gc)) {
- dbg_gc("no space, some index LEBs GC'ed, -EAGAIN");
- ubifs_commit_required(c);
- ret = -EAGAIN;
- }
- err = ubifs_wbuf_sync_nolock(wbuf);
- if (!err)
- err = ubifs_leb_unmap(c, c->gc_lnum);
- if (err) {
- ret = err;
- goto out;
- }
- out_unlock:
- mutex_unlock(&wbuf->io_mutex);
- return ret;
- out:
- ubifs_assert(ret < 0);
- ubifs_assert(ret != -ENOSPC && ret != -EAGAIN);
- ubifs_wbuf_sync_nolock(wbuf);
- ubifs_ro_mode(c, ret);
- mutex_unlock(&wbuf->io_mutex);
- ubifs_return_leb(c, lp.lnum);
- return ret;
- }
- int ubifs_gc_start_commit(struct ubifs_info *c)
- {
- struct ubifs_gced_idx_leb *idx_gc;
- const struct ubifs_lprops *lp;
- int err = 0, flags;
- ubifs_get_lprops(c);
-
- while (1) {
- lp = ubifs_fast_find_freeable(c);
- if (IS_ERR(lp)) {
- err = PTR_ERR(lp);
- goto out;
- }
- if (!lp)
- break;
- ubifs_assert(!(lp->flags & LPROPS_TAKEN));
- ubifs_assert(!(lp->flags & LPROPS_INDEX));
- err = ubifs_leb_unmap(c, lp->lnum);
- if (err)
- goto out;
- lp = ubifs_change_lp(c, lp, c->leb_size, 0, lp->flags, 0);
- if (IS_ERR(lp)) {
- err = PTR_ERR(lp);
- goto out;
- }
- ubifs_assert(!(lp->flags & LPROPS_TAKEN));
- ubifs_assert(!(lp->flags & LPROPS_INDEX));
- }
-
- list_for_each_entry(idx_gc, &c->idx_gc, list)
- idx_gc->unmap = 1;
-
- while (1) {
- lp = ubifs_fast_find_frdi_idx(c);
- if (IS_ERR(lp)) {
- err = PTR_ERR(lp);
- goto out;
- }
- if (!lp)
- break;
- idx_gc = kmalloc(sizeof(struct ubifs_gced_idx_leb), GFP_NOFS);
- if (!idx_gc) {
- err = -ENOMEM;
- goto out;
- }
- ubifs_assert(!(lp->flags & LPROPS_TAKEN));
- ubifs_assert(lp->flags & LPROPS_INDEX);
-
- flags = (lp->flags | LPROPS_TAKEN) ^ LPROPS_INDEX;
- lp = ubifs_change_lp(c, lp, c->leb_size, 0, flags, 1);
- if (IS_ERR(lp)) {
- err = PTR_ERR(lp);
- kfree(idx_gc);
- goto out;
- }
- ubifs_assert(lp->flags & LPROPS_TAKEN);
- ubifs_assert(!(lp->flags & LPROPS_INDEX));
- idx_gc->lnum = lp->lnum;
- idx_gc->unmap = 1;
- list_add(&idx_gc->list, &c->idx_gc);
- }
- out:
- ubifs_release_lprops(c);
- return err;
- }
- int ubifs_gc_end_commit(struct ubifs_info *c)
- {
- struct ubifs_gced_idx_leb *idx_gc, *tmp;
- struct ubifs_wbuf *wbuf;
- int err = 0;
- wbuf = &c->jheads[GCHD].wbuf;
- mutex_lock_nested(&wbuf->io_mutex, wbuf->jhead);
- list_for_each_entry_safe(idx_gc, tmp, &c->idx_gc, list)
- if (idx_gc->unmap) {
- dbg_gc("LEB %d", idx_gc->lnum);
- err = ubifs_leb_unmap(c, idx_gc->lnum);
- if (err)
- goto out;
- err = ubifs_change_one_lp(c, idx_gc->lnum, LPROPS_NC,
- LPROPS_NC, 0, LPROPS_TAKEN, -1);
- if (err)
- goto out;
- list_del(&idx_gc->list);
- kfree(idx_gc);
- }
- out:
- mutex_unlock(&wbuf->io_mutex);
- return err;
- }
- void ubifs_destroy_idx_gc(struct ubifs_info *c)
- {
- while (!list_empty(&c->idx_gc)) {
- struct ubifs_gced_idx_leb *idx_gc;
- idx_gc = list_entry(c->idx_gc.next, struct ubifs_gced_idx_leb,
- list);
- c->idx_gc_cnt -= 1;
- list_del(&idx_gc->list);
- kfree(idx_gc);
- }
- }
- int ubifs_get_idx_gc_leb(struct ubifs_info *c)
- {
- struct ubifs_gced_idx_leb *idx_gc;
- int lnum;
- if (list_empty(&c->idx_gc))
- return -ENOSPC;
- idx_gc = list_entry(c->idx_gc.next, struct ubifs_gced_idx_leb, list);
- lnum = idx_gc->lnum;
-
- list_del(&idx_gc->list);
- kfree(idx_gc);
- return lnum;
- }
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