Release 4.10 fs/jffs2/nodemgmt.c

/*
 * JFFS2 -- Journalling Flash File System, Version 2.
 *
 * Copyright © 2001-2007 Red Hat, Inc.
 *
 * Created by David Woodhouse <dwmw2@infradead.org>
 *
 * For licensing information, see the file 'LICENCE' in this directory.
 *
 */


#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/kernel.h>
#include <linux/mtd/mtd.h>
#include <linux/compiler.h>
#include <linux/sched.h> /* For cond_resched() */
#include "nodelist.h"
#include "debug.h"

/*
 * Check whether the user is allowed to write.
 */


static int jffs2_rp_can_write(struct jffs2_sb_info *c)
{
	uint32_t avail;
	struct jffs2_mount_opts *opts = &c->mount_opts;

	avail = c->dirty_size + c->free_size + c->unchecked_size +
		c->erasing_size - c->resv_blocks_write * c->sector_size
		- c->nospc_dirty_size;

	if (avail < 2 * opts->rp_size)
		jffs2_dbg(1, "rpsize %u, dirty_size %u, free_size %u, "
			  "erasing_size %u, unchecked_size %u, "
			  "nr_erasing_blocks %u, avail %u, resrv %u\n",
			  opts->rp_size, c->dirty_size, c->free_size,
			  c->erasing_size, c->unchecked_size,
			  c->nr_erasing_blocks, avail, c->nospc_dirty_size);

	if (avail > opts->rp_size)
		return 1;

	/* Always allow root */
	if (capable(CAP_SYS_RESOURCE))
		return 1;

	jffs2_dbg(1, "forbid writing\n");
	return 0;
}

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/**
 *      jffs2_reserve_space - request physical space to write nodes to flash
 *      @c: superblock info
 *      @minsize: Minimum acceptable size of allocation
 *      @len: Returned value of allocation length
 *      @prio: Allocation type - ALLOC_{NORMAL,DELETION}
 *
 *      Requests a block of physical space on the flash. Returns zero for success
 *      and puts 'len' into the appropriate place, or returns -ENOSPC or other 
 *      error if appropriate. Doesn't return len since that's 
 *
 *      If it returns zero, jffs2_reserve_space() also downs the per-filesystem
 *      allocation semaphore, to prevent more than one allocation from being
 *      active at any time. The semaphore is later released by jffs2_commit_allocation()
 *
 *      jffs2_reserve_space() may trigger garbage collection in order to make room
 *      for the requested allocation.
 */

static int jffs2_do_reserve_space(struct jffs2_sb_info *c,  uint32_t minsize,
				  uint32_t *len, uint32_t sumsize);



int jffs2_reserve_space(struct jffs2_sb_info *c, uint32_t minsize,
			uint32_t *len, int prio, uint32_t sumsize)
{
	int ret = -EAGAIN;
	int blocksneeded = c->resv_blocks_write;
	/* align it */
	minsize = PAD(minsize);

	jffs2_dbg(1, "%s(): Requested 0x%x bytes\n", __func__, minsize);
	mutex_lock(&c->alloc_sem);

	jffs2_dbg(1, "%s(): alloc sem got\n", __func__);

	spin_lock(&c->erase_completion_lock);

	/*
         * Check if the free space is greater then size of the reserved pool.
         * If not, only allow root to proceed with writing.
         */
	if (prio != ALLOC_DELETION && !jffs2_rp_can_write(c)) {
		ret = -ENOSPC;
		goto out;
	}

	/* this needs a little more thought (true <tglx> :)) */
	while(ret == -EAGAIN) {
		while(c->nr_free_blocks + c->nr_erasing_blocks < blocksneeded) {
			uint32_t dirty, avail;

			/* calculate real dirty size
                         * dirty_size contains blocks on erase_pending_list
                         * those blocks are counted in c->nr_erasing_blocks.
                         * If one block is actually erased, it is not longer counted as dirty_space
                         * but it is counted in c->nr_erasing_blocks, so we add it and subtract it
                         * with c->nr_erasing_blocks * c->sector_size again.
                         * Blocks on erasable_list are counted as dirty_size, but not in c->nr_erasing_blocks
                         * This helps us to force gc and pick eventually a clean block to spread the load.
                         * We add unchecked_size here, as we hopefully will find some space to use.
                         * This will affect the sum only once, as gc first finishes checking
                         * of nodes.
                         */
			dirty = c->dirty_size + c->erasing_size - c->nr_erasing_blocks * c->sector_size + c->unchecked_size;
			if (dirty < c->nospc_dirty_size) {
				if (prio == ALLOC_DELETION && c->nr_free_blocks + c->nr_erasing_blocks >= c->resv_blocks_deletion) {
					jffs2_dbg(1, "%s(): Low on dirty space to GC, but it's a deletion. Allowing...\n",
						  __func__);
					break;
				}
				jffs2_dbg(1, "dirty size 0x%08x + unchecked_size 0x%08x < nospc_dirty_size 0x%08x, returning -ENOSPC\n",
					  dirty, c->unchecked_size,
					  c->sector_size);

				spin_unlock(&c->erase_completion_lock);
				mutex_unlock(&c->alloc_sem);
				return -ENOSPC;
			}

			/* Calc possibly available space. Possibly available means that we
                         * don't know, if unchecked size contains obsoleted nodes, which could give us some
                         * more usable space. This will affect the sum only once, as gc first finishes checking
                         * of nodes.
                         + Return -ENOSPC, if the maximum possibly available space is less or equal than
                         * blocksneeded * sector_size.
                         * This blocks endless gc looping on a filesystem, which is nearly full, even if
                         * the check above passes.
                         */
			avail = c->free_size + c->dirty_size + c->erasing_size + c->unchecked_size;
			if ( (avail / c->sector_size) <= blocksneeded) {
				if (prio == ALLOC_DELETION && c->nr_free_blocks + c->nr_erasing_blocks >= c->resv_blocks_deletion) {
					jffs2_dbg(1, "%s(): Low on possibly available space, but it's a deletion. Allowing...\n",
						  __func__);
					break;
				}

				jffs2_dbg(1, "max. available size 0x%08x  < blocksneeded * sector_size 0x%08x, returning -ENOSPC\n",
					  avail, blocksneeded * c->sector_size);
				spin_unlock(&c->erase_completion_lock);
				mutex_unlock(&c->alloc_sem);
				return -ENOSPC;
			}

			mutex_unlock(&c->alloc_sem);

			jffs2_dbg(1, "Triggering GC pass. nr_free_blocks %d, nr_erasing_blocks %d, free_size 0x%08x, dirty_size 0x%08x, wasted_size 0x%08x, used_size 0x%08x, erasing_size 0x%08x, bad_size 0x%08x (total 0x%08x of 0x%08x)\n",
				  c->nr_free_blocks, c->nr_erasing_blocks,
				  c->free_size, c->dirty_size, c->wasted_size,
				  c->used_size, c->erasing_size, c->bad_size,
				  c->free_size + c->dirty_size +
				  c->wasted_size + c->used_size +
				  c->erasing_size + c->bad_size,
				  c->flash_size);
			spin_unlock(&c->erase_completion_lock);

			ret = jffs2_garbage_collect_pass(c);

			if (ret == -EAGAIN) {
				spin_lock(&c->erase_completion_lock);
				if (c->nr_erasing_blocks &&
				    list_empty(&c->erase_pending_list) &&
				    list_empty(&c->erase_complete_list)) {
					DECLARE_WAITQUEUE(wait, current);
					set_current_state(TASK_UNINTERRUPTIBLE);
					add_wait_queue(&c->erase_wait, &wait);
					jffs2_dbg(1, "%s waiting for erase to complete\n",
						  __func__);
					spin_unlock(&c->erase_completion_lock);

					schedule();
					remove_wait_queue(&c->erase_wait, &wait);
				} else
					spin_unlock(&c->erase_completion_lock);
			} else if (ret)
				return ret;

			cond_resched();

			if (signal_pending(current))
				return -EINTR;

			mutex_lock(&c->alloc_sem);
			spin_lock(&c->erase_completion_lock);
		}

		ret = jffs2_do_reserve_space(c, minsize, len, sumsize);
		if (ret) {
			jffs2_dbg(1, "%s(): ret is %d\n", __func__, ret);
		}
	}

out:
	spin_unlock(&c->erase_completion_lock);
	if (!ret)
		ret = jffs2_prealloc_raw_node_refs(c, c->nextblock, 1);
	if (ret)
		mutex_unlock(&c->alloc_sem);
	return ret;
}

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david woodhouse
289
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9
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linus torvalds
linus torvalds
258
40.63%
3
16.67%
joe perches
joe perches
42
6.61%
1
5.56%
daniel drake
daniel drake
25
3.94%
1
5.56%
li zefan
li zefan
11
1.73%
1
5.56%
ferenc havasi
ferenc havasi
5
0.79%
1
5.56%
artem bityutskiy
artem bityutskiy
4
0.63%
1
5.56%
thomas gleixner
thomas gleixner
1
0.16%
1
5.56%
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635
100.00%
18
100.00%



int jffs2_reserve_space_gc(struct jffs2_sb_info *c, uint32_t minsize,
			   uint32_t *len, uint32_t sumsize)
{
	int ret;
	minsize = PAD(minsize);

	jffs2_dbg(1, "%s(): Requested 0x%x bytes\n", __func__, minsize);

	while (true) {
		spin_lock(&c->erase_completion_lock);
		ret = jffs2_do_reserve_space(c, minsize, len, sumsize);
		if (ret) {
			jffs2_dbg(1, "%s(): looping, ret is %d\n",
				  __func__, ret);
		}
		spin_unlock(&c->erase_completion_lock);

		if (ret == -EAGAIN)
			cond_resched();
		else
			break;
	}
	if (!ret)
		ret = jffs2_prealloc_raw_node_refs(c, c->nextblock, 1);

	return ret;
}


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linus torvalds
linus torvalds
69
54.76%
1
12.50%
david woodhouse
david woodhouse
22
17.46%
4
50.00%
li zefan
li zefan
18
14.29%
1
12.50%
joe perches
joe perches
12
9.52%
1
12.50%
ferenc havasi
ferenc havasi
5
3.97%
1
12.50%
Total
126
100.00%
8
100.00%

/* Classify nextblock (clean, dirty of verydirty) and force to select an other one */



static void jffs2_close_nextblock(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb)
{

	if (c->nextblock == NULL) {
		jffs2_dbg(1, "%s(): Erase block at 0x%08x has already been placed in a list\n",
			  __func__, jeb->offset);
		return;
	}
	/* Check, if we have a dirty block now, or if it was dirty already */
	if (ISDIRTY (jeb->wasted_size + jeb->dirty_size)) {
		c->dirty_size += jeb->wasted_size;
		c->wasted_size -= jeb->wasted_size;
		jeb->dirty_size += jeb->wasted_size;
		jeb->wasted_size = 0;
		if (VERYDIRTY(c, jeb->dirty_size)) {
			jffs2_dbg(1, "Adding full erase block at 0x%08x to very_dirty_list (free 0x%08x, dirty 0x%08x, used 0x%08x\n",
				  jeb->offset, jeb->free_size, jeb->dirty_size,
				  jeb->used_size);
			list_add_tail(&jeb->list, &c->very_dirty_list);
		} else {
			jffs2_dbg(1, "Adding full erase block at 0x%08x to dirty_list (free 0x%08x, dirty 0x%08x, used 0x%08x\n",
				  jeb->offset, jeb->free_size, jeb->dirty_size,
				  jeb->used_size);
			list_add_tail(&jeb->list, &c->dirty_list);
		}
	} else {
		jffs2_dbg(1, "Adding full erase block at 0x%08x to clean_list (free 0x%08x, dirty 0x%08x, used 0x%08x\n",
			  jeb->offset, jeb->free_size, jeb->dirty_size,
			  jeb->used_size);
		list_add_tail(&jeb->list, &c->clean_list);
	}
	c->nextblock = NULL;

}

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david woodhouse
david woodhouse
132
60.27%
3
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linus torvalds
linus torvalds
51
23.29%
1
14.29%
adrian hunter
adrian hunter
18
8.22%
1
14.29%
joe perches
joe perches
15
6.85%
1
14.29%
ferenc havasi
ferenc havasi
3
1.37%
1
14.29%
Total
219
100.00%
7
100.00%

/* Select a new jeb for nextblock */



static int jffs2_find_nextblock(struct jffs2_sb_info *c)
{
	struct list_head *next;

	/* Take the next block off the 'free' list */

	if (list_empty(&c->free_list)) {

		if (!c->nr_erasing_blocks &&
			!list_empty(&c->erasable_list)) {
			struct jffs2_eraseblock *ejeb;

			ejeb = list_entry(c->erasable_list.next, struct jffs2_eraseblock, list);
			list_move_tail(&ejeb->list, &c->erase_pending_list);
			c->nr_erasing_blocks++;
			jffs2_garbage_collect_trigger(c);
			jffs2_dbg(1, "%s(): Triggering erase of erasable block at 0x%08x\n",
				  __func__, ejeb->offset);
		}

		if (!c->nr_erasing_blocks &&
			!list_empty(&c->erasable_pending_wbuf_list)) {
			jffs2_dbg(1, "%s(): Flushing write buffer\n",
				  __func__);
			/* c->nextblock is NULL, no update to c->nextblock allowed */
			spin_unlock(&c->erase_completion_lock);
			jffs2_flush_wbuf_pad(c);
			spin_lock(&c->erase_completion_lock);
			/* Have another go. It'll be on the erasable_list now */
			return -EAGAIN;
		}

		if (!c->nr_erasing_blocks) {
			/* Ouch. We're in GC, or we wouldn't have got here.
                           And there's no space left. At all. */
			pr_crit("Argh. No free space left for GC. nr_erasing_blocks is %d. nr_free_blocks is %d. (erasableempty: %s, erasingempty: %s, erasependingempty: %s)\n",
				c->nr_erasing_blocks, c->nr_free_blocks,
				list_empty(&c->erasable_list) ? "yes" : "no",
				list_empty(&c->erasing_list) ? "yes" : "no",
				list_empty(&c->erase_pending_list) ? "yes" : "no");
			return -ENOSPC;
		}

		spin_unlock(&c->erase_completion_lock);
		/* Don't wait for it; just erase one right now */
		jffs2_erase_pending_blocks(c, 1);
		spin_lock(&c->erase_completion_lock);

		/* An erase may have failed, decreasing the
                   amount of free space available. So we must
                   restart from the beginning */
		return -EAGAIN;
	}

	next = c->free_list.next;
	list_del(next);
	c->nextblock = list_entry(next, struct jffs2_eraseblock, list);
	c->nr_free_blocks--;

	jffs2_sum_reset_collected(c->summary); /* reset collected summary */

#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
	/* adjust write buffer offset, else we get a non contiguous write bug */
	if (!(c->wbuf_ofs % c->sector_size) && !c->wbuf_len)
		c->wbuf_ofs = 0xffffffff;
#endif

	jffs2_dbg(1, "%s(): new nextblock = 0x%08x\n",
		  __func__, c->nextblock->offset);

	return 0;
}

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david woodhouse
134
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6
46.15%
linus torvalds
linus torvalds
122
36.09%
1
7.69%
ferenc havasi
ferenc havasi
32
9.47%
1
7.69%
alexander belyakov
alexander belyakov
25
7.40%
1
7.69%
joe perches
joe perches
19
5.62%
2
15.38%
steve glendinning
steve glendinning
5
1.48%
1
7.69%
akinobu mita
akinobu mita
1
0.30%
1
7.69%
Total
338
100.00%
13
100.00%

/* Called with alloc sem _and_ erase_completion_lock */


static int jffs2_do_reserve_space(struct jffs2_sb_info *c, uint32_t minsize,
				  uint32_t *len, uint32_t sumsize)
{
	struct jffs2_eraseblock *jeb = c->nextblock;
	uint32_t reserved_size;				/* for summary information at the end of the jeb */
	int ret;

 restart:
	reserved_size = 0;

	if (jffs2_sum_active() && (sumsize != JFFS2_SUMMARY_NOSUM_SIZE)) {
							/* NOSUM_SIZE means not to generate summary */

		if (jeb) {
			reserved_size = PAD(sumsize + c->summary->sum_size + JFFS2_SUMMARY_FRAME_SIZE);
			dbg_summary("minsize=%d , jeb->free=%d ,"
						"summary->size=%d , sumsize=%d\n",
						minsize, jeb->free_size,
						c->summary->sum_size, sumsize);
		}

		/* Is there enough space for writing out the current node, or we have to
                   write out summary information now, close this jeb and select new nextblock? */
		if (jeb && (PAD(minsize) + PAD(c->summary->sum_size + sumsize +
					JFFS2_SUMMARY_FRAME_SIZE) > jeb->free_size)) {

			/* Has summary been disabled for this jeb? */
			if (jffs2_sum_is_disabled(c->summary)) {
				sumsize = JFFS2_SUMMARY_NOSUM_SIZE;
				goto restart;
			}

			/* Writing out the collected summary information */
			dbg_summary("generating summary for 0x%08x.\n", jeb->offset);
			ret = jffs2_sum_write_sumnode(c);

			if (ret)
				return ret;

			if (jffs2_sum_is_disabled(c->summary)) {
				/* jffs2_write_sumnode() couldn't write out the summary information
                                   diabling summary for this jeb and free the collected information
                                 */
				sumsize = JFFS2_SUMMARY_NOSUM_SIZE;
				goto restart;
			}

			jffs2_close_nextblock(c, jeb);
			jeb = NULL;
			/* keep always valid value in reserved_size */
			reserved_size = PAD(sumsize + c->summary->sum_size + JFFS2_SUMMARY_FRAME_SIZE);
		}
	} else {
		if (jeb && minsize > jeb->free_size) {
			uint32_t waste;

			/* Skip the end of this block and file it as having some dirty space */
			/* If there's a pending write to it, flush now */

			if (jffs2_wbuf_dirty(c)) {
				spin_unlock(&c->erase_completion_lock);
				jffs2_dbg(1, "%s(): Flushing write buffer\n",
					  __func__);
				jffs2_flush_wbuf_pad(c);
				spin_lock(&c->erase_completion_lock);
				jeb = c->nextblock;
				goto restart;
			}

			spin_unlock(&c->erase_completion_lock);

			ret = jffs2_prealloc_raw_node_refs(c, jeb, 1);

			/* Just lock it again and continue. Nothing much can change because
                           we hold c->alloc_sem anyway. In fact, it's not entirely clear why
                           we hold c->erase_completion_lock in the majority of this function...
                           but that's a question for another (more caffeine-rich) day. */
			spin_lock(&c->erase_completion_lock);

			if (ret)
				return ret;

			waste = jeb->free_size;
			jffs2_link_node_ref(c, jeb,
					    (jeb->offset + c->sector_size - waste) | REF_OBSOLETE,
					    waste, NULL);
			/* FIXME: that made it count as dirty. Convert to wasted */
			jeb->dirty_size -= waste;
			c->dirty_size -= waste;
			jeb->wasted_size += waste;
			c->wasted_size += waste;

			jffs2_close_nextblock(c, jeb);
			jeb = NULL;
		}
	}

	if (!jeb) {

		ret = jffs2_find_nextblock(c);
		if (ret)
			return ret;

		jeb = c->nextblock;

		if (jeb->free_size != c->sector_size - c->cleanmarker_size) {
			pr_warn("Eep. Block 0x%08x taken from free_list had free_size of 0x%08x!!\n",
				jeb->offset, jeb->free_size);
			goto restart;
		}
	}
	/* OK, jeb (==c->nextblock) is now pointing at a block which definitely has
           enough space */
	*len = jeb->free_size - reserved_size;

	if (c->cleanmarker_size && jeb->used_size == c->cleanmarker_size &&
	    !jeb->first_node->next_in_ino) {
		/* Only node in it beforehand was a CLEANMARKER node (we think).
                   So mark it obsolete now that there's going to be another node
                   in the block. This will reduce used_size to zero but We've
                   already set c->nextblock so that jffs2_mark_node_obsolete()
                   won't try to refile it to the dirty_list.
                */
		spin_unlock(&c->erase_completion_lock);
		jffs2_mark_node_obsolete(c, jeb->first_node);
		spin_lock(&c->erase_completion_lock);
	}

	jffs2_dbg(1, "%s(): Giving 0x%x bytes at 0x%x\n",
		  __func__,
		  *len, jeb->offset + (c->sector_size - jeb->free_size));
	return 0;
}

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ferenc havasi
ferenc havasi
331
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david woodhouse
david woodhouse
133
24.86%
6
42.86%
linus torvalds
linus torvalds
48
8.97%
1
7.14%
joe perches
joe perches
13
2.43%
2
14.29%
alexey khoroshilov
alexey khoroshilov
7
1.31%
1
7.14%
artem bityutskiy
artem bityutskiy
2
0.37%
1
7.14%
thomas gleixner
thomas gleixner
1
0.19%
1
7.14%
Total
535
100.00%
14
100.00%

/**
 *      jffs2_add_physical_node_ref - add a physical node reference to the list
 *      @c: superblock info
 *      @new: new node reference to add
 *      @len: length of this physical node
 *
 *      Should only be used to report nodes for which space has been allocated
 *      by jffs2_reserve_space.
 *
 *      Must be called with the alloc_sem held.
 */



struct jffs2_raw_node_ref *jffs2_add_physical_node_ref(struct jffs2_sb_info *c,
						       uint32_t ofs, uint32_t len,
						       struct jffs2_inode_cache *ic)
{
	struct jffs2_eraseblock *jeb;
	struct jffs2_raw_node_ref *new;

	jeb = &c->blocks[ofs / c->sector_size];

	jffs2_dbg(1, "%s(): Node at 0x%x(%d), size 0x%x\n",
		  __func__, ofs & ~3, ofs & 3, len);
#if 1
	/* Allow non-obsolete nodes only to be added at the end of c->nextblock, 
           if c->nextblock is set. Note that wbuf.c will file obsolete nodes
           even after refiling c->nextblock */
	if ((c->nextblock || ((ofs & 3) != REF_OBSOLETE))
	    && (jeb != c->nextblock || (ofs & ~3) != jeb->offset + (c->sector_size - jeb->free_size))) {
		pr_warn("argh. node added in wrong place at 0x%08x(%d)\n",
			ofs & ~3, ofs & 3);
		if (c->nextblock)
			pr_warn("nextblock 0x%08x", c->nextblock->offset);
		else
			pr_warn("No nextblock");
		pr_cont(", expected at %08x\n",
			jeb->offset + (c->sector_size - jeb->free_size));
		return ERR_PTR(-EINVAL);
	}
#endif
	spin_lock(&c->erase_completion_lock);

	new = jffs2_link_node_ref(c, jeb, ofs, len, ic);

	if (!jeb->free_size && !jeb->dirty_size && !ISDIRTY(jeb->wasted_size)) {
		/* If it lives on the dirty_list, jffs2_reserve_space will put it there */
		jffs2_dbg(1, "Adding full erase block at 0x%08x to clean_list (free 0x%08x, dirty 0x%08x, used 0x%08x\n",
			  jeb->offset, jeb->free_size, jeb->dirty_size,
			  jeb->used_size);
		if (jffs2_wbuf_dirty(c)) {
			/* Flush the last write in the block if it's outstanding */
			spin_unlock(&c->erase_completion_lock);
			jffs2_flush_wbuf_pad(c);
			spin_lock(&c->erase_completion_lock);
		}

		list_add_tail(&jeb->list, &c->clean_list);
		c->nextblock = NULL;
	}
	jffs2_dbg_acct_sanity_check_nolock(c,jeb);
	jffs2_dbg_acct_paranoia_check_nolock(c, jeb);

	spin_unlock(&c->erase_completion_lock);

	return new;
}


Contributors
Person
Tokens
Prop
Commits
CommitProp
david woodhouse
david woodhouse
154
46.81%
9
56.25%
linus torvalds
linus torvalds
141
42.86%
1
6.25%
estelle hammache
estelle hammache
17
5.17%
2
12.50%
joe perches
joe perches
13
3.95%
2
12.50%
artem bityutskiy
artem bityutskiy
4
1.22%
2
12.50%
Total
329
100.00%
16
100.00%



void jffs2_complete_reservation(struct jffs2_sb_info *c)
{
	jffs2_dbg(1, "jffs2_complete_reservation()\n");
	spin_lock(&c->erase_completion_lock);
	jffs2_garbage_collect_trigger(c);
	spin_unlock(&c->erase_completion_lock);
	mutex_unlock(&c->alloc_sem);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
linus torvalds
linus torvalds
26
56.52%
1
25.00%
david woodhouse
david woodhouse
17
36.96%
2
50.00%
joe perches
joe perches
3
6.52%
1
25.00%
Total
46
100.00%
4
100.00%



static inline int on_list(struct list_head *obj, struct list_head *head)
{
	struct list_head *this;

	list_for_each(this, head) {
		if (this == obj) {
			jffs2_dbg(1, "%p is on list at %p\n", obj, head);
			return 1;

		}
	}
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
david woodhouse
david woodhouse
52
94.55%
1
50.00%
joe perches
joe perches
3
5.45%
1
50.00%
Total
55
100.00%
2
100.00%



void jffs2_mark_node_obsolete(struct jffs2_sb_info *c, struct jffs2_raw_node_ref *ref)
{
	struct jffs2_eraseblock *jeb;
	int blocknr;
	struct jffs2_unknown_node n;
	int ret, addedsize;
	size_t retlen;
	uint32_t freed_len;

	if(unlikely(!ref)) {
		pr_notice("EEEEEK. jffs2_mark_node_obsolete called with NULL node\n");
		return;
	}
	if (ref_obsolete(ref)) {
		jffs2_dbg(1, "%s(): called with already obsolete node at 0x%08x\n",
			  __func__, ref_offset(ref));
		return;
	}
	blocknr = ref->flash_offset / c->sector_size;
	if (blocknr >= c->nr_blocks) {
		pr_notice("raw node at 0x%08x is off the end of device!\n",
			  ref->flash_offset);
		BUG();
	}
	jeb = &c->blocks[blocknr];

	if (jffs2_can_mark_obsolete(c) && !jffs2_is_readonly(c) &&
	    !(c->flags & (JFFS2_SB_FLAG_SCANNING | JFFS2_SB_FLAG_BUILDING))) {
		/* Hm. This may confuse static lock analysis. If any of the above
                   three conditions is false, we're going to return from this
                   function without actually obliterating any nodes or freeing
                   any jffs2_raw_node_refs. So we don't need to stop erases from
                   happening, or protect against people holding an obsolete
                   jffs2_raw_node_ref without the erase_completion_lock. */
		mutex_lock(&c->erase_free_sem);
	}

	spin_lock(&c->erase_completion_lock);

	freed_len = ref_totlen(c, jeb, ref);

	if (ref_flags(ref) == REF_UNCHECKED) {
		D1(if (unlikely(jeb->unchecked_size < freed_len)) {
                                pr_notice("raw unchecked node of size 0x%08x freed from erase block %d at 0x%08x, but unchecked_size was already 0x%08x\n",
                                          freed_len, blocknr,
                                          ref->flash_offset, jeb->used_size);
                        BUG();
                })
			jffs2_dbg(1, "Obsoleting previously unchecked node at 0x%08x of len %x\n",
				  ref_offset(ref), freed_len);
		jeb->unchecked_size -= freed_len;
		c->unchecked_size -= freed_len;
	} else {
		D1(if (unlikely(jeb->used_size < freed_len)) {
                                pr_notice("raw node of size 0x%08x freed from erase block %d at 0x%08x, but used_size was already 0x%08x\n",
                                          freed_len, blocknr,
                                          ref->flash_offset, jeb->used_size);
                        BUG();
                })
			jffs2_dbg(1, "Obsoleting node at 0x%08x of len %#x: ",
				  ref_offset(ref), freed_len);
		jeb->used_size -= freed_len;
		c->used_size -= freed_len;
	}

	// Take care, that wasted size is taken into concern
	if ((jeb->dirty_size || ISDIRTY(jeb->wasted_size + freed_len)) && jeb != c->nextblock) {
		jffs2_dbg(1, "Dirtying\n");
		addedsize = freed_len;
		jeb->dirty_size += freed_len;
		c->dirty_size += freed_len;

		/* Convert wasted space to dirty, if not a bad block */
		if (jeb->wasted_size) {
			if (on_list(&jeb->list, &c->bad_used_list)) {
				jffs2_dbg(1, "Leaving block at %08x on the bad_used_list\n",
					  jeb->offset);
				addedsize = 0; /* To fool the refiling code later */
			} else {
				jffs2_dbg(1, "Converting %d bytes of wasted space to dirty in block at %08x\n",
					  jeb->wasted_size, jeb->offset);
				addedsize += jeb->wasted_size;
				jeb->dirty_size += jeb->wasted_size;
				c->dirty_size += jeb->wasted_size;
				c->wasted_size -= jeb->wasted_size;
				jeb->wasted_size = 0;
			}
		}
	} else {
		jffs2_dbg(1, "Wasting\n");
		addedsize = 0;
		jeb->wasted_size += freed_len;
		c->wasted_size += freed_len;
	}
	ref->flash_offset = ref_offset(ref) | REF_OBSOLETE;

	jffs2_dbg_acct_sanity_check_nolock(c, jeb);
	jffs2_dbg_acct_paranoia_check_nolock(c, jeb);

	if (c->flags & JFFS2_SB_FLAG_SCANNING) {
		/* Flash scanning is in progress. Don't muck about with the block
                   lists because they're not ready yet, and don't actually
                   obliterate nodes that look obsolete. If they weren't
                   marked obsolete on the flash at the time they _became_
                   obsolete, there was probably a reason for that. */
		spin_unlock(&c->erase_completion_lock);
		/* We didn't lock the erase_free_sem */
		return;
	}

	if (jeb