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Two patches which fix a problem reported by several people in the past,

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but only fixed now because no one gave enough material for debugging.
 
 Anyway, these fix the problem that sometimes after a power cut the
 file-system is not mountable with the following symptom:
 
 	grab_empty_leb: could not find an empty LEB
 
 The fixes make the file-system mountable again.
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Merge tag 'upstream-3.7-rc6' of git://git.infradead.org/linux-ubifs

Pull UBIFS fixes from Artem Bityutskiy:
 "Two patches which fix a problem reported by several people in the
  past, but only fixed now because no one gave enough material for
  debugging.

  Anyway, these fix the problem that sometimes after a power cut the
  file-system is not mountable with the following symptom:

	grab_empty_leb: could not find an empty LEB

  The fixes make the file-system mountable again."

* tag 'upstream-3.7-rc6' of git://git.infradead.org/linux-ubifs:
  UBIFS: fix mounting problems after power cuts
  UBIFS: introduce categorized lprops counter
This commit is contained in:
Linus Torvalds 2012-11-15 11:28:43 -08:00
commit ce95a36bb9
3 changed files with 19 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
fs/ubifs/find.c
View File

@ -681,8 +681,16 @@ int ubifs_find_free_leb_for_idx(struct ubifs_info *c)
if (!lprops) {
lprops = ubifs_fast_find_freeable(c);
if (!lprops) {
ubifs_assert(c->freeable_cnt == 0);
if (c->lst.empty_lebs - c->lst.taken_empty_lebs > 0) {
/*
* The first condition means the following: go scan the
* LPT if there are uncategorized lprops, which means
* there may be freeable LEBs there (UBIFS does not
* store the information about freeable LEBs in the
* master node).
*/
if (c->in_a_category_cnt != c->main_lebs ||
c->lst.empty_lebs - c->lst.taken_empty_lebs > 0) {
ubifs_assert(c->freeable_cnt == 0);
lprops = scan_for_leb_for_idx(c);
if (IS_ERR(lprops)) {
err = PTR_ERR(lprops);

6
fs/ubifs/lprops.c
View File

@ -300,8 +300,11 @@ void ubifs_add_to_cat(struct ubifs_info *c, struct ubifs_lprops *lprops,
default:
ubifs_assert(0);
}
lprops->flags &= ~LPROPS_CAT_MASK;
lprops->flags |= cat;
c->in_a_category_cnt += 1;
ubifs_assert(c->in_a_category_cnt <= c->main_lebs);
}
/**
@ -334,6 +337,9 @@ static void ubifs_remove_from_cat(struct ubifs_info *c,
default:
ubifs_assert(0);
}
c->in_a_category_cnt -= 1;
ubifs_assert(c->in_a_category_cnt >= 0);
}
/**

3
fs/ubifs/ubifs.h
View File

@ -1183,6 +1183,8 @@ struct ubifs_debug_info;
* @freeable_list: list of freeable non-index LEBs (free + dirty == @leb_size)
* @frdi_idx_list: list of freeable index LEBs (free + dirty == @leb_size)
* @freeable_cnt: number of freeable LEBs in @freeable_list
* @in_a_category_cnt: count of lprops which are in a certain category, which
* basically meants that they were loaded from the flash
*
* @ltab_lnum: LEB number of LPT's own lprops table
* @ltab_offs: offset of LPT's own lprops table
@ -1412,6 +1414,7 @@ struct ubifs_info {
struct list_head freeable_list;
struct list_head frdi_idx_list;
int freeable_cnt;
int in_a_category_cnt;
int ltab_lnum;
int ltab_offs;