return 0;
}
+/**
+ * grab_empty_leb - grab an empty LEB to use as GC LEB and run commit.
+ * @c: UBIFS file-system description object
+ *
+ * This is a helper function for 'ubifs_rcvry_gc_commit()' which grabs an empty
+ * LEB to be used as GC LEB (@c->gc_lnum), and then runs the commit. Returns
+ * zero in case of success and a negative error code in case of failure.
+ */
+static int grab_empty_leb(struct ubifs_info *c)
+{
+ int lnum, err;
+
+ /*
+ * Note, it is very important to first search for an empty LEB and then
+ * run the commit, not vice-versa. The reason is that there might be
+ * only one empty LEB at the moment, the one which has been the
+ * @c->gc_lnum just before the power cut happened. During the regular
+ * UBIFS operation (not now) @c->gc_lnum is marked as "taken", so no
+ * one but GC can grab it. But at this moment this single empty LEB is
+ * not marked as taken, so if we run commit - what happens? Right, the
+ * commit will grab it and write the index there. Remember that the
+ * index always expands as long as there is free space, and it only
+ * starts consolidating when we run out of space.
+ *
+ * IOW, if we run commit now, we might not be able to find a free LEB
+ * after this.
+ */
+ lnum = ubifs_find_free_leb_for_idx(c);
+ if (lnum < 0) {
+ dbg_err("could not find an empty LEB");
+ dbg_dump_lprops(c);
+ dbg_dump_budg(c, &c->bi);
+ return lnum;
+ }
+
+ /* Reset the index flag */
+ err = ubifs_change_one_lp(c, lnum, LPROPS_NC, LPROPS_NC, 0,
+ LPROPS_INDEX, 0);
+ if (err)
+ return err;
+
+ c->gc_lnum = lnum;
+ dbg_rcvry("found empty LEB %d, run commit", lnum);
+
+ return ubifs_run_commit(c);
+}
+
/**
* ubifs_rcvry_gc_commit - recover the GC LEB number and run the commit.
* @c: UBIFS file-system description object
{
struct ubifs_wbuf *wbuf = &c->jheads[GCHD].wbuf;
struct ubifs_lprops lp;
- int lnum, err;
+ int err;
c->gc_lnum = -1;
- if (wbuf->lnum == -1) {
- dbg_rcvry("no GC head LEB");
- goto find_free;
- }
- /*
- * See whether the used space in the dirtiest LEB fits in the GC head
- * LEB.
- */
- if (wbuf->offs == c->leb_size) {
- dbg_rcvry("no room in GC head LEB");
- goto find_free;
+ if (wbuf->lnum == -1 || wbuf->offs == c->leb_size) {
+ dbg_rcvry("no GC head: wbuf->lnum %d, wbuf->offs %d",
+ wbuf->lnum, wbuf->offs);
+ return grab_empty_leb(c);
}
+
err = ubifs_find_dirty_leb(c, &lp, wbuf->offs, 2);
if (err) {
- /*
- * There are no dirty or empty LEBs subject to here being
- * enough for the index. Try to use
- * 'ubifs_find_free_leb_for_idx()', which will return any empty
- * LEBs (ignoring index requirements). If the index then
- * doesn't have enough LEBs the recovery commit will fail -
- * which is the same result anyway i.e. recovery fails. So
- * there is no problem ignoring index requirements and just
- * grabbing a free LEB since we have already established there
- * is not a dirty LEB we could have used instead.
- */
- if (err == -ENOSPC) {
- dbg_rcvry("could not find a dirty LEB");
- goto find_free;
- }
- return err;
- }
- ubifs_assert(!(lp.flags & LPROPS_INDEX));
- lnum = lp.lnum;
- if (lp.free + lp.dirty == c->leb_size) {
- /* An empty LEB was returned */
- if (lp.free != c->leb_size) {
- err = ubifs_change_one_lp(c, lnum, c->leb_size,
- 0, 0, 0, 0);
- if (err)
- return err;
- }
- err = ubifs_leb_unmap(c, lnum);
- if (err)
- return err;
- c->gc_lnum = lnum;
- dbg_rcvry("allocated LEB %d for GC", lnum);
- /* Run the commit */
- dbg_rcvry("committing");
- return ubifs_run_commit(c);
- }
- /*
- * There was no empty LEB so the used space in the dirtiest LEB must fit
- * in the GC head LEB.
- */
- if (lp.free + lp.dirty < wbuf->offs) {
- dbg_rcvry("LEB %d doesn't fit in GC head LEB %d:%d",
- lnum, wbuf->lnum, wbuf->offs);
- err = ubifs_return_leb(c, lnum);
- if (err)
+ if (err != -ENOSPC)
return err;
- goto find_free;
+
+ dbg_rcvry("could not find a dirty LEB");
+ return grab_empty_leb(c);
}
+
+ ubifs_assert(!(lp.flags & LPROPS_INDEX));
+ ubifs_assert(lp.free + lp.dirty >= wbuf->offs);
+
/*
* We run the commit before garbage collection otherwise subsequent
* mounts will see the GC and orphan deletion in a different order.
err = ubifs_run_commit(c);
if (err)
return err;
- /*
- * The data in the dirtiest LEB fits in the GC head LEB, so do the GC
- * - use locking to keep 'ubifs_assert()' happy.
- */
- dbg_rcvry("GC'ing LEB %d", lnum);
+
+ dbg_rcvry("GC'ing LEB %d", lp.lnum);
mutex_lock_nested(&wbuf->io_mutex, wbuf->jhead);
err = ubifs_garbage_collect_leb(c, &lp);
if (err >= 0) {
err = -EINVAL;
return err;
}
- if (err != LEB_RETAINED) {
- dbg_err("GC returned %d", err);
+
+ ubifs_assert(err == LEB_RETAINED);
+ if (err != LEB_RETAINED)
return -EINVAL;
- }
+
err = ubifs_leb_unmap(c, c->gc_lnum);
if (err)
return err;
- dbg_rcvry("allocated LEB %d for GC", lnum);
- return 0;
-find_free:
- /*
- * There is no GC head LEB or the free space in the GC head LEB is too
- * small, or there are not dirty LEBs. Allocate gc_lnum by calling
- * 'ubifs_find_free_leb_for_idx()' so GC is not run.
- */
- lnum = ubifs_find_free_leb_for_idx(c);
- if (lnum < 0) {
- dbg_err("could not find an empty LEB");
- return lnum;
- }
- /* And reset the index flag */
- err = ubifs_change_one_lp(c, lnum, LPROPS_NC, LPROPS_NC, 0,
- LPROPS_INDEX, 0);
- if (err)
- return err;
- c->gc_lnum = lnum;
- dbg_rcvry("allocated LEB %d for GC", lnum);
- /* Run the commit */
- dbg_rcvry("committing");
- return ubifs_run_commit(c);
+ dbg_rcvry("allocated LEB %d for GC", lp.lnum);
+ return 0;
}
/**
err = ubi_leb_change(c->ubi, lnum, c->sbuf, len, UBI_UNKNOWN);
if (err)
goto out;
- dbg_rcvry("inode %lu at %d:%d size %lld -> %lld ",
+ dbg_rcvry("inode %lu at %d:%d size %lld -> %lld",
(unsigned long)e->inum, lnum, offs, i_size, e->d_size);
return 0;
e->i_size = le64_to_cpu(ino->size);
}
}
+
if (e->exists && e->i_size < e->d_size) {
- if (!e->inode && c->ro_mount) {
+ if (c->ro_mount) {
/* Fix the inode size and pin it in memory */
struct inode *inode;
+ ubifs_assert(!e->inode);
+
inode = ubifs_iget(c->vfs_sb, e->inum);
if (IS_ERR(inode))
return PTR_ERR(inode);
if (inode->i_size < e->d_size) {
dbg_rcvry("ino %lu size %lld -> %lld",
(unsigned long)e->inum,
- e->d_size, inode->i_size);
+ inode->i_size, e->d_size);
inode->i_size = e->d_size;
ubifs_inode(inode)->ui_size = e->d_size;
e->inode = inode;
iput(e->inode);
}
}
+
this = rb_next(this);
rb_erase(&e->rb, &c->size_tree);
kfree(e);
}
+
return 0;
}
projects / karo-tx-linux.git / blobdiff