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| author | David Woodhouse <dwmw2@infradead.org> | 2008-04-23 15:40:52 +0100 |
|---|---|---|
| committer | David Woodhouse <dwmw2@infradead.org> | 2008-04-23 16:01:37 +0100 |
| commit | 422b120238130307da64fa44c9fb722bfaf5f1af (patch) | |
| tree | 72f47ac8dcd66ae074d1b4b916ffc8fe32183bf1 /fs/jffs2 | |
| parent | e2bc322bf05936ec7160d62bc3fd45cbf4aa405a (diff) | |
| download | lwn-422b120238130307da64fa44c9fb722bfaf5f1af.tar.gz lwn-422b120238130307da64fa44c9fb722bfaf5f1af.zip | |
[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>
Diffstat (limited to 'fs/jffs2')
| -rw-r--r-- | fs/jffs2/gc.c | 8 | ||||
| -rw-r--r-- | fs/jffs2/nodemgmt.c | 5 |
2 files changed, 11 insertions, 2 deletions
diff --git a/fs/jffs2/gc.c b/fs/jffs2/gc.c index 26c7992c45ca..bad005664e30 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 747a73f0aa4d..9df8f3ef20df 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(); |