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UBIFS: introduce lsave debugging 

Try to improve UBIFS testing coverage by randomly picking LEBs to
store in lsave, rather than picking them optimally. Create a debugging
version of 'populate_lsave()' for these purposes and enable it when
general debugging self-checks are enabled.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
This commit is contained in:
Artem Bityutskiy 2011-04-05 15:43:44 +03:00
parent bc3f07f090
commit cdd8ad6e9e
1 changed files with 53 additions and 0 deletions
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53
fs/ubifs/lpt_commit.c
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@ -29,6 +29,12 @@
#include <linux/slab.h> #include <linux/slab.h>
#include "ubifs.h" #include "ubifs.h"
#ifdef CONFIG_UBIFS_FS_DEBUG
static int dbg_populate_lsave(struct ubifs_info *c);
#else
#define dbg_populate_lsave(c) 0
#endif
/** /**
* first_dirty_cnode - find first dirty cnode. * first_dirty_cnode - find first dirty cnode.
* @c: UBIFS file-system description object * @c: UBIFS file-system description object
@ -815,6 +821,10 @@ static void populate_lsave(struct ubifs_info *c)
c->lpt_drty_flgs |= LSAVE_DIRTY; c->lpt_drty_flgs |= LSAVE_DIRTY;
ubifs_add_lpt_dirt(c, c->lsave_lnum, c->lsave_sz); ubifs_add_lpt_dirt(c, c->lsave_lnum, c->lsave_sz);
} }
if (dbg_populate_lsave(c))
return;
list_for_each_entry(lprops, &c->empty_list, list) { list_for_each_entry(lprops, &c->empty_list, list) {
c->lsave[cnt++] = lprops->lnum; c->lsave[cnt++] = lprops->lnum;
if (cnt >= c->lsave_cnt) if (cnt >= c->lsave_cnt)
@ -1994,4 +2004,47 @@ void dbg_dump_lpt_lebs(const struct ubifs_info *c)
current->pid); current->pid);
} }
/**
* dbg_populate_lsave - debugging version of 'populate_lsave()'
* @c: UBIFS file-system description object
*
* This is a debugging version for 'populate_lsave()' which populates lsave
* with random LEBs instead of useful LEBs, which is good for test coverage.
* Returns zero if lsave has not been populated (this debugging feature is
* disabled) an non-zero if lsave has been populated.
*/
static int dbg_populate_lsave(struct ubifs_info *c)
{
struct ubifs_lprops *lprops;
struct ubifs_lpt_heap *heap;
int i;
if (!(ubifs_chk_flags & UBIFS_CHK_GEN))
return 0;
if (random32() & 3)
return 0;
for (i = 0; i < c->lsave_cnt; i++)
c->lsave[i] = c->main_first;
list_for_each_entry(lprops, &c->empty_list, list)
c->lsave[random32() % c->lsave_cnt] = lprops->lnum;
list_for_each_entry(lprops, &c->freeable_list, list)
c->lsave[random32() % c->lsave_cnt] = lprops->lnum;
list_for_each_entry(lprops, &c->frdi_idx_list, list)
c->lsave[random32() % c->lsave_cnt] = lprops->lnum;
heap = &c->lpt_heap[LPROPS_DIRTY_IDX - 1];
for (i = 0; i < heap->cnt; i++)
c->lsave[random32() % c->lsave_cnt] = heap->arr[i]->lnum;
heap = &c->lpt_heap[LPROPS_DIRTY - 1];
for (i = 0; i < heap->cnt; i++)
c->lsave[random32() % c->lsave_cnt] = heap->arr[i]->lnum;
heap = &c->lpt_heap[LPROPS_FREE - 1];
for (i = 0; i < heap->cnt; i++)
c->lsave[random32() % c->lsave_cnt] = heap->arr[i]->lnum;
return 1;
}
#endif /* CONFIG_UBIFS_FS_DEBUG */ #endif /* CONFIG_UBIFS_FS_DEBUG */