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authorDavid Woodhouse <dwmw2@infradead.org>2008-04-23 15:40:52 +0100
committerDavid Woodhouse <dwmw2@infradead.org>2008-04-23 16:01:37 +0100
commit422b120238130307da64fa44c9fb722bfaf5f1af (patch)
tree72f47ac8dcd66ae074d1b4b916ffc8fe32183bf1
parente2bc322bf05936ec7160d62bc3fd45cbf4aa405a (diff)
[JFFS2] Fix jffs2_reserve_space() when all blocks are pending erasure.
When _all_ the blocks were on the erase_pending_list, we could't find a block to GC from but there was no _actually_ free space, and jffs2_reserve_space() would get a little unhappy. Handle this case by returning -EAGAIN from jffs2_garbage_collect_pass(). There are two callers of that function -- jffs2_flush_wbuf_gc(), which will interpret it as an error and flush the writebuffer by other means, and jffs2_reserve_space(), which we modify to respond to -EAGAIN with an immediate call to jffs2_erase_pending_blocks() and another run round the loop. Signed-off-by: David Woodhouse <dwmw2@infradead.org>
-rw-r--r--fs/jffs2/gc.c8
-rw-r--r--fs/jffs2/nodemgmt.c5
2 files changed, 11 insertions, 2 deletions
diff --git a/fs/jffs2/gc.c b/fs/jffs2/gc.c
index 26c7992c45c..bad005664e3 100644
--- a/fs/jffs2/gc.c
+++ b/fs/jffs2/gc.c
@@ -221,7 +221,13 @@ int jffs2_garbage_collect_pass(struct jffs2_sb_info *c)
jeb = jffs2_find_gc_block(c);
if (!jeb) {
- D1 (printk(KERN_NOTICE "jffs2: Couldn't find erase block to garbage collect!\n"));
+ /* Couldn't find a free block. But maybe we can just erase one and make 'progress'? */
+ if (!list_empty(&c->erase_pending_list)) {
+ spin_unlock(&c->erase_completion_lock);
+ mutex_unlock(&c->alloc_sem);
+ return -EAGAIN;
+ }
+ D1(printk(KERN_NOTICE "jffs2: Couldn't find erase block to garbage collect!\n"));
spin_unlock(&c->erase_completion_lock);
mutex_unlock(&c->alloc_sem);
return -EIO;
diff --git a/fs/jffs2/nodemgmt.c b/fs/jffs2/nodemgmt.c
index 747a73f0aa4..9df8f3ef20d 100644
--- a/fs/jffs2/nodemgmt.c
+++ b/fs/jffs2/nodemgmt.c
@@ -116,7 +116,10 @@ int jffs2_reserve_space(struct jffs2_sb_info *c, uint32_t minsize,
spin_unlock(&c->erase_completion_lock);
ret = jffs2_garbage_collect_pass(c);
- if (ret)
+
+ if (ret == -EAGAIN)
+ jffs2_erase_pending_blocks(c, 1);
+ else if (ret)
return ret;
cond_resched();