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UBIFS: add re-mount debugging checks

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We observe space corrupted accounting when re-mounting. So add some
debbugging checks to catch problems like this.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
This commit is contained in:
Artem Bityutskiy 2009-01-23 14:54:59 +02:00
parent e4d9b6cbfc
commit 84abf972cc
7 changed files with 148 additions and 65 deletions
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35
fs/ubifs/budget.c
View file

@ -689,7 +689,7 @@ long long ubifs_reported_space(const struct ubifs_info *c, long long free)
}
/**
* ubifs_get_free_space - return amount of free space.
* ubifs_get_free_space_nolock - return amount of free space.
* @c: UBIFS file-system description object
*
* This function calculates amount of free space to report to user-space.
@ -704,16 +704,14 @@ long long ubifs_reported_space(const struct ubifs_info *c, long long free)
* traditional file-systems, because they have way less overhead than UBIFS.
* So, to keep users happy, UBIFS tries to take the overhead into account.
*/
long long ubifs_get_free_space(struct ubifs_info *c)
long long ubifs_get_free_space_nolock(struct ubifs_info *c)
{
int min_idx_lebs, rsvd_idx_lebs, lebs;
int rsvd_idx_lebs, lebs;
long long available, outstanding, free;
spin_lock(&c->space_lock);
min_idx_lebs = c->min_idx_lebs;
ubifs_assert(min_idx_lebs == ubifs_calc_min_idx_lebs(c));
ubifs_assert(c->min_idx_lebs == ubifs_calc_min_idx_lebs(c));
outstanding = c->budg_data_growth + c->budg_dd_growth;
available = ubifs_calc_available(c, min_idx_lebs);
available = ubifs_calc_available(c, c->min_idx_lebs);
/*
* When reporting free space to user-space, UBIFS guarantees that it is
@ -726,15 +724,14 @@ long long ubifs_get_free_space(struct ubifs_info *c)
* Note, the calculations below are similar to what we have in
* 'do_budget_space()', so refer there for comments.
*/
if (min_idx_lebs > c->lst.idx_lebs)
rsvd_idx_lebs = min_idx_lebs - c->lst.idx_lebs;
if (c->min_idx_lebs > c->lst.idx_lebs)
rsvd_idx_lebs = c->min_idx_lebs - c->lst.idx_lebs;
else
rsvd_idx_lebs = 0;
lebs = c->lst.empty_lebs + c->freeable_cnt + c->idx_gc_cnt -
c->lst.taken_empty_lebs;
lebs -= rsvd_idx_lebs;
available += lebs * (c->dark_wm - c->leb_overhead);
spin_unlock(&c->space_lock);
if (available > outstanding)
free = ubifs_reported_space(c, available - outstanding);
@ -742,3 +739,21 @@ long long ubifs_get_free_space(struct ubifs_info *c)
free = 0;
return free;
}
/**
* ubifs_get_free_space - return amount of free space.
* @c: UBIFS file-system description object
*
* This function calculates and retuns amount of free space to report to
* user-space.
*/
long long ubifs_get_free_space(struct ubifs_info *c)
{
long long free;
spin_lock(&c->space_lock);
free = ubifs_get_free_space_nolock(c);
spin_unlock(&c->space_lock);
return free;
}

120
fs/ubifs/debug.c
View file

@ -620,9 +620,11 @@ void dbg_dump_budg(struct ubifs_info *c)
c->dark_wm, c->dead_wm, c->max_idx_node_sz);
printk(KERN_DEBUG "\tgc_lnum %d, ihead_lnum %d\n",
c->gc_lnum, c->ihead_lnum);
for (i = 0; i < c->jhead_cnt; i++)
printk(KERN_DEBUG "\tjhead %d\t LEB %d\n",
c->jheads[i].wbuf.jhead, c->jheads[i].wbuf.lnum);
/* If we are in R/O mode, journal heads do not exist */
if (c->jheads)
for (i = 0; i < c->jhead_cnt; i++)
printk(KERN_DEBUG "\tjhead %d\t LEB %d\n",
c->jheads[i].wbuf.jhead, c->jheads[i].wbuf.lnum);
for (rb = rb_first(&c->buds); rb; rb = rb_next(rb)) {
bud = rb_entry(rb, struct ubifs_bud, rb);
printk(KERN_DEBUG "\tbud LEB %d\n", bud->lnum);
@ -637,10 +639,7 @@ void dbg_dump_budg(struct ubifs_info *c)
/* Print budgeting predictions */
available = ubifs_calc_available(c, c->min_idx_lebs);
outstanding = c->budg_data_growth + c->budg_dd_growth;
if (available > outstanding)
free = ubifs_reported_space(c, available - outstanding);
else
free = 0;
free = ubifs_get_free_space_nolock(c);
printk(KERN_DEBUG "Budgeting predictions:\n");
printk(KERN_DEBUG "\tavailable: %lld, outstanding %lld, free %lld\n",
available, outstanding, free);
@ -860,6 +859,65 @@ void dbg_dump_index(struct ubifs_info *c)
dbg_walk_index(c, NULL, dump_znode, NULL);
}
/**
* dbg_save_space_info - save information about flash space.
* @c: UBIFS file-system description object
*
* This function saves information about UBIFS free space, dirty space, etc, in
* order to check it later.
*/
void dbg_save_space_info(struct ubifs_info *c)
{
struct ubifs_debug_info *d = c->dbg;
ubifs_get_lp_stats(c, &d->saved_lst);
spin_lock(&c->space_lock);
d->saved_free = ubifs_get_free_space_nolock(c);
spin_unlock(&c->space_lock);
}
/**
* dbg_check_space_info - check flash space information.
* @c: UBIFS file-system description object
*
* This function compares current flash space information with the information
* which was saved when the 'dbg_save_space_info()' function was called.
* Returns zero if the information has not changed, and %-EINVAL it it has
* changed.
*/
int dbg_check_space_info(struct ubifs_info *c)
{
struct ubifs_debug_info *d = c->dbg;
struct ubifs_lp_stats lst;
long long avail, free;
spin_lock(&c->space_lock);
avail = ubifs_calc_available(c, c->min_idx_lebs);
spin_unlock(&c->space_lock);
free = ubifs_get_free_space(c);
if (free != d->saved_free) {
ubifs_err("free space changed from %lld to %lld",
d->saved_free, free);
goto out;
}
return 0;
out:
ubifs_msg("saved lprops statistics dump");
dbg_dump_lstats(&d->saved_lst);
ubifs_get_lp_stats(c, &lst);
ubifs_msg("current lprops statistics dump");
dbg_dump_lstats(&d->saved_lst);
spin_lock(&c->space_lock);
dbg_dump_budg(c);
spin_unlock(&c->space_lock);
dump_stack();
return -EINVAL;
}
/**
* dbg_check_synced_i_size - check synchronized inode size.
* @inode: inode to check
@ -2409,7 +2467,7 @@ void ubifs_debugging_exit(struct ubifs_info *c)
* Root directory for UBIFS stuff in debugfs. Contains sub-directories which
* contain the stuff specific to particular file-system mounts.
*/
static struct dentry *debugfs_rootdir;
static struct dentry *dfs_rootdir;
/**
* dbg_debugfs_init - initialize debugfs file-system.
@ -2421,9 +2479,9 @@ static struct dentry *debugfs_rootdir;
*/
int dbg_debugfs_init(void)
{
debugfs_rootdir = debugfs_create_dir("ubifs", NULL);
if (IS_ERR(debugfs_rootdir)) {
int err = PTR_ERR(debugfs_rootdir);
dfs_rootdir = debugfs_create_dir("ubifs", NULL);
if (IS_ERR(dfs_rootdir)) {
int err = PTR_ERR(dfs_rootdir);
ubifs_err("cannot create \"ubifs\" debugfs directory, "
"error %d\n", err);
return err;
@ -2437,7 +2495,7 @@ int dbg_debugfs_init(void)
*/
void dbg_debugfs_exit(void)
{
debugfs_remove(debugfs_rootdir);
debugfs_remove(dfs_rootdir);
}
static int open_debugfs_file(struct inode *inode, struct file *file)
@ -2452,13 +2510,13 @@ static ssize_t write_debugfs_file(struct file *file, const char __user *buf,
struct ubifs_info *c = file->private_data;
struct ubifs_debug_info *d = c->dbg;
if (file->f_path.dentry == d->dump_lprops)
if (file->f_path.dentry == d->dfs_dump_lprops)
dbg_dump_lprops(c);
else if (file->f_path.dentry == d->dump_budg) {
else if (file->f_path.dentry == d->dfs_dump_budg) {
spin_lock(&c->space_lock);
dbg_dump_budg(c);
spin_unlock(&c->space_lock);
} else if (file->f_path.dentry == d->dump_tnc) {
} else if (file->f_path.dentry == d->dfs_dump_tnc) {
mutex_lock(&c->tnc_mutex);
dbg_dump_tnc(c);
mutex_unlock(&c->tnc_mutex);
@ -2469,7 +2527,7 @@ static ssize_t write_debugfs_file(struct file *file, const char __user *buf,
return count;
}
static const struct file_operations debugfs_fops = {
static const struct file_operations dfs_fops = {
.open = open_debugfs_file,
.write = write_debugfs_file,
.owner = THIS_MODULE,
@ -2494,36 +2552,32 @@ int dbg_debugfs_init_fs(struct ubifs_info *c)
struct dentry *dent;
struct ubifs_debug_info *d = c->dbg;
sprintf(d->debugfs_dir_name, "ubi%d_%d", c->vi.ubi_num, c->vi.vol_id);
d->debugfs_dir = debugfs_create_dir(d->debugfs_dir_name,
debugfs_rootdir);
if (IS_ERR(d->debugfs_dir)) {
err = PTR_ERR(d->debugfs_dir);
sprintf(d->dfs_dir_name, "ubi%d_%d", c->vi.ubi_num, c->vi.vol_id);
d->dfs_dir = debugfs_create_dir(d->dfs_dir_name, dfs_rootdir);
if (IS_ERR(d->dfs_dir)) {
err = PTR_ERR(d->dfs_dir);
ubifs_err("cannot create \"%s\" debugfs directory, error %d\n",
d->debugfs_dir_name, err);
d->dfs_dir_name, err);
goto out;
}
fname = "dump_lprops";
dent = debugfs_create_file(fname, S_IWUGO, d->debugfs_dir, c,
&debugfs_fops);
dent = debugfs_create_file(fname, S_IWUGO, d->dfs_dir, c, &dfs_fops);
if (IS_ERR(dent))
goto out_remove;
d->dump_lprops = dent;
d->dfs_dump_lprops = dent;
fname = "dump_budg";
dent = debugfs_create_file(fname, S_IWUGO, d->debugfs_dir, c,
&debugfs_fops);
dent = debugfs_create_file(fname, S_IWUGO, d->dfs_dir, c, &dfs_fops);
if (IS_ERR(dent))
goto out_remove;
d->dump_budg = dent;
d->dfs_dump_budg = dent;
fname = "dump_tnc";
dent = debugfs_create_file(fname, S_IWUGO, d->debugfs_dir, c,
&debugfs_fops);
dent = debugfs_create_file(fname, S_IWUGO, d->dfs_dir, c, &dfs_fops);
if (IS_ERR(dent))
goto out_remove;
d->dump_tnc = dent;
d->dfs_dump_tnc = dent;
return 0;
@ -2531,7 +2585,7 @@ out_remove:
err = PTR_ERR(dent);
ubifs_err("cannot create \"%s\" debugfs directory, error %d\n",
fname, err);
debugfs_remove_recursive(d->debugfs_dir);
debugfs_remove_recursive(d->dfs_dir);
out:
return err;
}
@ -2542,7 +2596,7 @@ out:
*/
void dbg_debugfs_exit_fs(struct ubifs_info *c)
{
debugfs_remove_recursive(c->dbg->debugfs_dir);
debugfs_remove_recursive(c->dbg->dfs_dir);
}
#endif /* CONFIG_UBIFS_FS_DEBUG */

36
fs/ubifs/debug.h
View file

@ -41,15 +41,17 @@
* @chk_lpt_wastage: used by LPT tree size checker
* @chk_lpt_lebs: used by LPT tree size checker
* @new_nhead_offs: used by LPT tree size checker
* @new_ihead_lnum: used by debugging to check ihead_lnum
* @new_ihead_offs: used by debugging to check ihead_offs
* @new_ihead_lnum: used by debugging to check @c->ihead_lnum
* @new_ihead_offs: used by debugging to check @c->ihead_offs
*
* debugfs_dir_name: name of debugfs directory containing this file-system's
* files
* debugfs_dir: direntry object of the file-system debugfs directory
* dump_lprops: "dump lprops" debugfs knob
* dump_budg: "dump budgeting information" debugfs knob
* dump_tnc: "dump TNC" debugfs knob
* @saved_lst: saved lprops statistics (used by 'dbg_save_space_info()')
* @saved_free: saved free space (used by 'dbg_save_space_info()')
*
* dfs_dir_name: name of debugfs directory containing this file-system's files
* dfs_dir: direntry object of the file-system debugfs directory
* dfs_dump_lprops: "dump lprops" debugfs knob
* dfs_dump_budg: "dump budgeting information" debugfs knob
* dfs_dump_tnc: "dump TNC" debugfs knob
*/
struct ubifs_debug_info {
void *buf;
@ -69,11 +71,14 @@ struct ubifs_debug_info {
int new_ihead_lnum;
int new_ihead_offs;
char debugfs_dir_name[100];
struct dentry *debugfs_dir;
struct dentry *dump_lprops;
struct dentry *dump_budg;
struct dentry *dump_tnc;
struct ubifs_lp_stats saved_lst;
long long saved_free;
char dfs_dir_name[100];
struct dentry *dfs_dir;
struct dentry *dfs_dump_lprops;
struct dentry *dfs_dump_budg;
struct dentry *dfs_dump_tnc;
};
#define ubifs_assert(expr) do { \
@ -297,7 +302,8 @@ int dbg_walk_index(struct ubifs_info *c, dbg_leaf_callback leaf_cb,
dbg_znode_callback znode_cb, void *priv);
/* Checking functions */
void dbg_save_space_info(struct ubifs_info *c);
int dbg_check_space_info(struct ubifs_info *c);
int dbg_check_lprops(struct ubifs_info *c);
int dbg_old_index_check_init(struct ubifs_info *c, struct ubifs_zbranch *zroot);
int dbg_check_old_index(struct ubifs_info *c, struct ubifs_zbranch *zroot);
@ -439,6 +445,8 @@ void dbg_debugfs_exit_fs(struct ubifs_info *c);
#define dbg_walk_index(c, leaf_cb, znode_cb, priv) 0
#define dbg_old_index_check_init(c, zroot) 0
#define dbg_save_space_info(c) ({})
#define dbg_check_space_info(c) 0
#define dbg_check_old_index(c, zroot) 0
#define dbg_check_cats(c) 0
#define dbg_check_ltab(c) 0

1
fs/ubifs/file.c
View file

@ -432,7 +432,6 @@ static int ubifs_write_begin(struct file *file, struct address_space *mapping,
int uninitialized_var(err), appending = !!(pos + len > inode->i_size);
struct page *page;
ubifs_assert(ubifs_inode(inode)->ui_size == inode->i_size);
if (unlikely(c->ro_media))

4
fs/ubifs/lprops.c
View file

@ -635,10 +635,10 @@ const struct ubifs_lprops *ubifs_change_lp(struct ubifs_info *c,
* @c: UBIFS file-system description object
* @st: return statistics
*/
void ubifs_get_lp_stats(struct ubifs_info *c, struct ubifs_lp_stats *st)
void ubifs_get_lp_stats(struct ubifs_info *c, struct ubifs_lp_stats *lst)
{
spin_lock(&c->space_lock);
memcpy(st, &c->lst, sizeof(struct ubifs_lp_stats));
memcpy(lst, &c->lst, sizeof(struct ubifs_lp_stats));
spin_unlock(&c->space_lock);
}

14
fs/ubifs/super.c
View file

@ -1470,6 +1470,7 @@ static int ubifs_remount_rw(struct ubifs_info *c)
int err, lnum;
mutex_lock(&c->umount_mutex);
dbg_save_space_info(c);
c->remounting_rw = 1;
c->always_chk_crc = 1;
@ -1573,8 +1574,9 @@ static int ubifs_remount_rw(struct ubifs_info *c)
c->vfs_sb->s_flags &= ~MS_RDONLY;
c->remounting_rw = 0;
c->always_chk_crc = 0;
err = dbg_check_space_info(c);
mutex_unlock(&c->umount_mutex);
return 0;
return err;
out:
vfree(c->orph_buf);
@ -1629,8 +1631,8 @@ static void commit_on_unmount(struct ubifs_info *c)
* ubifs_remount_ro - re-mount in read-only mode.
* @c: UBIFS file-system description object
*
* We rely on VFS to have stopped writing. Possibly the background thread could
* be running a commit, however kthread_stop will wait in that case.
* We assume VFS has stopped writing. Possibly the background thread could be
* running a commit, however kthread_stop will wait in that case.
*/
static void ubifs_remount_ro(struct ubifs_info *c)
{
@ -1640,13 +1642,14 @@ static void ubifs_remount_ro(struct ubifs_info *c)
ubifs_assert(!c->ro_media);
commit_on_unmount(c);
mutex_lock(&c->umount_mutex);
if (c->bgt) {
kthread_stop(c->bgt);
c->bgt = NULL;
}
dbg_save_space_info(c);
for (i = 0; i < c->jhead_cnt; i++) {
ubifs_wbuf_sync(&c->jheads[i].wbuf);
del_timer_sync(&c->jheads[i].wbuf.timer);
@ -1669,6 +1672,9 @@ static void ubifs_remount_ro(struct ubifs_info *c)
vfree(c->ileb_buf);
c->ileb_buf = NULL;
ubifs_lpt_free(c, 1);
err = dbg_check_space_info(c);
if (err)
ubifs_ro_mode(c, err);
mutex_unlock(&c->umount_mutex);
}

3
fs/ubifs/ubifs.h
View file

@ -1495,6 +1495,7 @@ void ubifs_release_ino_dirty(struct ubifs_info *c, struct inode *inode,
void ubifs_cancel_ino_op(struct ubifs_info *c, struct inode *inode,
struct ubifs_budget_req *req);
long long ubifs_get_free_space(struct ubifs_info *c);
long long ubifs_get_free_space_nolock(struct ubifs_info *c);
int ubifs_calc_min_idx_lebs(struct ubifs_info *c);
void ubifs_convert_page_budget(struct ubifs_info *c);
long long ubifs_reported_space(const struct ubifs_info *c, long long free);
@ -1646,7 +1647,7 @@ const struct ubifs_lprops *ubifs_change_lp(struct ubifs_info *c,
const struct ubifs_lprops *lp,
int free, int dirty, int flags,
int idx_gc_cnt);
void ubifs_get_lp_stats(struct ubifs_info *c, struct ubifs_lp_stats *stats);
void ubifs_get_lp_stats(struct ubifs_info *c, struct ubifs_lp_stats *lst);
void ubifs_add_to_cat(struct ubifs_info *c, struct ubifs_lprops *lprops,
int cat);
void ubifs_replace_cat(struct ubifs_info *c, struct ubifs_lprops *old_lprops,