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-rw-r--r--fs/ubifs/debug.c265
1 files changed, 233 insertions, 32 deletions
diff --git a/fs/ubifs/debug.c b/fs/ubifs/debug.c
index 510ffa0bbda..792c5a16c18 100644
--- a/fs/ubifs/debug.c
+++ b/fs/ubifs/debug.c
@@ -32,6 +32,8 @@
#include "ubifs.h"
#include <linux/module.h>
#include <linux/moduleparam.h>
+#include <linux/debugfs.h>
+#include <linux/math64.h>
#ifdef CONFIG_UBIFS_FS_DEBUG
@@ -596,7 +598,9 @@ void dbg_dump_budg(struct ubifs_info *c)
struct rb_node *rb;
struct ubifs_bud *bud;
struct ubifs_gced_idx_leb *idx_gc;
+ long long available, outstanding, free;
+ ubifs_assert(spin_is_locked(&c->space_lock));
spin_lock(&dbg_lock);
printk(KERN_DEBUG "(pid %d) Budgeting info: budg_data_growth %lld, "
"budg_dd_growth %lld, budg_idx_growth %lld\n", current->pid,
@@ -629,6 +633,17 @@ void dbg_dump_budg(struct ubifs_info *c)
printk(KERN_DEBUG "\tGC'ed idx LEB %d unmap %d\n",
idx_gc->lnum, idx_gc->unmap);
printk(KERN_DEBUG "\tcommit state %d\n", c->cmt_state);
+
+ /* 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;
+ printk(KERN_DEBUG "Budgeting predictions:\n");
+ printk(KERN_DEBUG "\tavailable: %lld, outstanding %lld, free %lld\n",
+ available, outstanding, free);
spin_unlock(&dbg_lock);
}
@@ -645,7 +660,8 @@ void dbg_dump_lprops(struct ubifs_info *c)
struct ubifs_lprops lp;
struct ubifs_lp_stats lst;
- printk(KERN_DEBUG "(pid %d) Dumping LEB properties\n", current->pid);
+ printk(KERN_DEBUG "(pid %d) start dumping LEB properties\n",
+ current->pid);
ubifs_get_lp_stats(c, &lst);
dbg_dump_lstats(&lst);
@@ -656,6 +672,8 @@ void dbg_dump_lprops(struct ubifs_info *c)
dbg_dump_lprop(c, &lp);
}
+ printk(KERN_DEBUG "(pid %d) finish dumping LEB properties\n",
+ current->pid);
}
void dbg_dump_lpt_info(struct ubifs_info *c)
@@ -663,6 +681,7 @@ void dbg_dump_lpt_info(struct ubifs_info *c)
int i;
spin_lock(&dbg_lock);
+ printk(KERN_DEBUG "(pid %d) dumping LPT information\n", current->pid);
printk(KERN_DEBUG "\tlpt_sz: %lld\n", c->lpt_sz);
printk(KERN_DEBUG "\tpnode_sz: %d\n", c->pnode_sz);
printk(KERN_DEBUG "\tnnode_sz: %d\n", c->nnode_sz);
@@ -684,7 +703,8 @@ void dbg_dump_lpt_info(struct ubifs_info *c)
printk(KERN_DEBUG "\tLPT root is at %d:%d\n", c->lpt_lnum, c->lpt_offs);
printk(KERN_DEBUG "\tLPT head is at %d:%d\n",
c->nhead_lnum, c->nhead_offs);
- printk(KERN_DEBUG "\tLPT ltab is at %d:%d\n", c->ltab_lnum, c->ltab_offs);
+ printk(KERN_DEBUG "\tLPT ltab is at %d:%d\n",
+ c->ltab_lnum, c->ltab_offs);
if (c->big_lpt)
printk(KERN_DEBUG "\tLPT lsave is at %d:%d\n",
c->lsave_lnum, c->lsave_offs);
@@ -703,9 +723,9 @@ void dbg_dump_leb(const struct ubifs_info *c, int lnum)
if (dbg_failure_mode)
return;
- printk(KERN_DEBUG "(pid %d) Dumping LEB %d\n", current->pid, lnum);
-
- sleb = ubifs_scan(c, lnum, 0, c->dbg_buf);
+ printk(KERN_DEBUG "(pid %d) start dumping LEB %d\n",
+ current->pid, lnum);
+ sleb = ubifs_scan(c, lnum, 0, c->dbg->buf);
if (IS_ERR(sleb)) {
ubifs_err("scan error %d", (int)PTR_ERR(sleb));
return;
@@ -721,6 +741,8 @@ void dbg_dump_leb(const struct ubifs_info *c, int lnum)
dbg_dump_node(c, snod->node);
}
+ printk(KERN_DEBUG "(pid %d) finish dumping LEB %d\n",
+ current->pid, lnum);
ubifs_scan_destroy(sleb);
return;
}
@@ -768,7 +790,7 @@ void dbg_dump_heap(struct ubifs_info *c, struct ubifs_lpt_heap *heap, int cat)
{
int i;
- printk(KERN_DEBUG "(pid %d) Dumping heap cat %d (%d elements)\n",
+ printk(KERN_DEBUG "(pid %d) start dumping heap cat %d (%d elements)\n",
current->pid, cat, heap->cnt);
for (i = 0; i < heap->cnt; i++) {
struct ubifs_lprops *lprops = heap->arr[i];
@@ -777,6 +799,7 @@ void dbg_dump_heap(struct ubifs_info *c, struct ubifs_lpt_heap *heap, int cat)
"flags %d\n", i, lprops->lnum, lprops->hpos,
lprops->free, lprops->dirty, lprops->flags);
}
+ printk(KERN_DEBUG "(pid %d) finish dumping heap\n", current->pid);
}
void dbg_dump_pnode(struct ubifs_info *c, struct ubifs_pnode *pnode,
@@ -784,7 +807,7 @@ void dbg_dump_pnode(struct ubifs_info *c, struct ubifs_pnode *pnode,
{
int i;
- printk(KERN_DEBUG "(pid %d) Dumping pnode:\n", current->pid);
+ printk(KERN_DEBUG "(pid %d) dumping pnode:\n", current->pid);
printk(KERN_DEBUG "\taddress %zx parent %zx cnext %zx\n",
(size_t)pnode, (size_t)parent, (size_t)pnode->cnext);
printk(KERN_DEBUG "\tflags %lu iip %d level %d num %d\n",
@@ -803,7 +826,7 @@ void dbg_dump_tnc(struct ubifs_info *c)
int level;
printk(KERN_DEBUG "\n");
- printk(KERN_DEBUG "(pid %d) Dumping the TNC tree\n", current->pid);
+ printk(KERN_DEBUG "(pid %d) start dumping TNC tree\n", current->pid);
znode = ubifs_tnc_levelorder_next(c->zroot.znode, NULL);
level = znode->level;
printk(KERN_DEBUG "== Level %d ==\n", level);
@@ -815,8 +838,7 @@ void dbg_dump_tnc(struct ubifs_info *c)
dbg_dump_znode(c, znode);
znode = ubifs_tnc_levelorder_next(c->zroot.znode, znode);
}
-
- printk(KERN_DEBUG "\n");
+ printk(KERN_DEBUG "(pid %d) finish dumping TNC tree\n", current->pid);
}
static int dump_znode(struct ubifs_info *c, struct ubifs_znode *znode,
@@ -992,8 +1014,8 @@ static int dbg_check_key_order(struct ubifs_info *c, struct ubifs_zbranch *zbr1,
zbr1->offs, DBGKEY(&key));
dbg_err("but it should have key %s according to tnc",
DBGKEY(&zbr1->key));
- dbg_dump_node(c, dent1);
- goto out_free;
+ dbg_dump_node(c, dent1);
+ goto out_free;
}
key_read(c, &dent2->key, &key);
@@ -1002,8 +1024,8 @@ static int dbg_check_key_order(struct ubifs_info *c, struct ubifs_zbranch *zbr1,
zbr1->offs, DBGKEY(&key));
dbg_err("but it should have key %s according to tnc",
DBGKEY(&zbr2->key));
- dbg_dump_node(c, dent2);
- goto out_free;
+ dbg_dump_node(c, dent2);
+ goto out_free;
}
nlen1 = le16_to_cpu(dent1->nlen);
@@ -1020,9 +1042,9 @@ static int dbg_check_key_order(struct ubifs_info *c, struct ubifs_zbranch *zbr1,
dbg_err("bad order of colliding key %s",
DBGKEY(&key));
- dbg_msg("first node at %d:%d\n", zbr1->lnum, zbr1->offs);
+ ubifs_msg("first node at %d:%d\n", zbr1->lnum, zbr1->offs);
dbg_dump_node(c, dent1);
- dbg_msg("second node at %d:%d\n", zbr2->lnum, zbr2->offs);
+ ubifs_msg("second node at %d:%d\n", zbr2->lnum, zbr2->offs);
dbg_dump_node(c, dent2);
out_free:
@@ -2097,13 +2119,13 @@ static int simple_rand(void)
return (next >> 16) & 32767;
}
-void dbg_failure_mode_registration(struct ubifs_info *c)
+static void failure_mode_init(struct ubifs_info *c)
{
struct failure_mode_info *fmi;
fmi = kmalloc(sizeof(struct failure_mode_info), GFP_NOFS);
if (!fmi) {
- dbg_err("Failed to register failure mode - no memory");
+ ubifs_err("Failed to register failure mode - no memory");
return;
}
fmi->c = c;
@@ -2112,7 +2134,7 @@ void dbg_failure_mode_registration(struct ubifs_info *c)
spin_unlock(&fmi_lock);
}
-void dbg_failure_mode_deregistration(struct ubifs_info *c)
+static void failure_mode_exit(struct ubifs_info *c)
{
struct failure_mode_info *fmi, *tmp;
@@ -2146,42 +2168,44 @@ static int in_failure_mode(struct ubi_volume_desc *desc)
struct ubifs_info *c = dbg_find_info(desc);
if (c && dbg_failure_mode)
- return c->failure_mode;
+ return c->dbg->failure_mode;
return 0;
}
static int do_fail(struct ubi_volume_desc *desc, int lnum, int write)
{
struct ubifs_info *c = dbg_find_info(desc);
+ struct ubifs_debug_info *d;
if (!c || !dbg_failure_mode)
return 0;
- if (c->failure_mode)
+ d = c->dbg;
+ if (d->failure_mode)
return 1;
- if (!c->fail_cnt) {
+ if (!d->fail_cnt) {
/* First call - decide delay to failure */
if (chance(1, 2)) {
unsigned int delay = 1 << (simple_rand() >> 11);
if (chance(1, 2)) {
- c->fail_delay = 1;
- c->fail_timeout = jiffies +
+ d->fail_delay = 1;
+ d->fail_timeout = jiffies +
msecs_to_jiffies(delay);
dbg_rcvry("failing after %ums", delay);
} else {
- c->fail_delay = 2;
- c->fail_cnt_max = delay;
+ d->fail_delay = 2;
+ d->fail_cnt_max = delay;
dbg_rcvry("failing after %u calls", delay);
}
}
- c->fail_cnt += 1;
+ d->fail_cnt += 1;
}
/* Determine if failure delay has expired */
- if (c->fail_delay == 1) {
- if (time_before(jiffies, c->fail_timeout))
+ if (d->fail_delay == 1) {
+ if (time_before(jiffies, d->fail_timeout))
return 0;
- } else if (c->fail_delay == 2)
- if (c->fail_cnt++ < c->fail_cnt_max)
+ } else if (d->fail_delay == 2)
+ if (d->fail_cnt++ < d->fail_cnt_max)
return 0;
if (lnum == UBIFS_SB_LNUM) {
if (write) {
@@ -2239,7 +2263,7 @@ static int do_fail(struct ubi_volume_desc *desc, int lnum, int write)
dbg_rcvry("failing in bud LEB %d commit not running", lnum);
}
ubifs_err("*** SETTING FAILURE MODE ON (LEB %d) ***", lnum);
- c->failure_mode = 1;
+ d->failure_mode = 1;
dump_stack();
return 1;
}
@@ -2344,4 +2368,181 @@ int dbg_leb_map(struct ubi_volume_desc *desc, int lnum, int dtype)
return 0;
}
+/**
+ * ubifs_debugging_init - initialize UBIFS debugging.
+ * @c: UBIFS file-system description object
+ *
+ * This function initializes debugging-related data for the file system.
+ * Returns zero in case of success and a negative error code in case of
+ * failure.
+ */
+int ubifs_debugging_init(struct ubifs_info *c)
+{
+ c->dbg = kzalloc(sizeof(struct ubifs_debug_info), GFP_KERNEL);
+ if (!c->dbg)
+ return -ENOMEM;
+
+ c->dbg->buf = vmalloc(c->leb_size);
+ if (!c->dbg->buf)
+ goto out;
+
+ failure_mode_init(c);
+ return 0;
+
+out:
+ kfree(c->dbg);
+ return -ENOMEM;
+}
+
+/**
+ * ubifs_debugging_exit - free debugging data.
+ * @c: UBIFS file-system description object
+ */
+void ubifs_debugging_exit(struct ubifs_info *c)
+{
+ failure_mode_exit(c);
+ vfree(c->dbg->buf);
+ kfree(c->dbg);
+}
+
+/*
+ * 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;
+
+/**
+ * dbg_debugfs_init - initialize debugfs file-system.
+ *
+ * UBIFS uses debugfs file-system to expose various debugging knobs to
+ * user-space. This function creates "ubifs" directory in the debugfs
+ * file-system. Returns zero in case of success and a negative error code in
+ * case of failure.
+ */
+int dbg_debugfs_init(void)
+{
+ debugfs_rootdir = debugfs_create_dir("ubifs", NULL);
+ if (IS_ERR(debugfs_rootdir)) {
+ int err = PTR_ERR(debugfs_rootdir);
+ ubifs_err("cannot create \"ubifs\" debugfs directory, "
+ "error %d\n", err);
+ return err;
+ }
+
+ return 0;
+}
+
+/**
+ * dbg_debugfs_exit - remove the "ubifs" directory from debugfs file-system.
+ */
+void dbg_debugfs_exit(void)
+{
+ debugfs_remove(debugfs_rootdir);
+}
+
+static int open_debugfs_file(struct inode *inode, struct file *file)
+{
+ file->private_data = inode->i_private;
+ return 0;
+}
+
+static ssize_t write_debugfs_file(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ struct ubifs_info *c = file->private_data;
+ struct ubifs_debug_info *d = c->dbg;
+
+ if (file->f_path.dentry == d->dump_lprops)
+ dbg_dump_lprops(c);
+ else if (file->f_path.dentry == d->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) {
+ mutex_lock(&c->tnc_mutex);
+ dbg_dump_tnc(c);
+ mutex_unlock(&c->tnc_mutex);
+ } else
+ return -EINVAL;
+
+ *ppos += count;
+ return count;
+}
+
+static const struct file_operations debugfs_fops = {
+ .open = open_debugfs_file,
+ .write = write_debugfs_file,
+ .owner = THIS_MODULE,
+};
+
+/**
+ * dbg_debugfs_init_fs - initialize debugfs for UBIFS instance.
+ * @c: UBIFS file-system description object
+ *
+ * This function creates all debugfs files for this instance of UBIFS. Returns
+ * zero in case of success and a negative error code in case of failure.
+ *
+ * Note, the only reason we have not merged this function with the
+ * 'ubifs_debugging_init()' function is because it is better to initialize
+ * debugfs interfaces at the very end of the mount process, and remove them at
+ * the very beginning of the mount process.
+ */
+int dbg_debugfs_init_fs(struct ubifs_info *c)
+{
+ int err;
+ const char *fname;
+ 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);
+ ubifs_err("cannot create \"%s\" debugfs directory, error %d\n",
+ d->debugfs_dir_name, err);
+ goto out;
+ }
+
+ fname = "dump_lprops";
+ dent = debugfs_create_file(fname, S_IWUGO, d->debugfs_dir, c,
+ &debugfs_fops);
+ if (IS_ERR(dent))
+ goto out_remove;
+ d->dump_lprops = dent;
+
+ fname = "dump_budg";
+ dent = debugfs_create_file(fname, S_IWUGO, d->debugfs_dir, c,
+ &debugfs_fops);
+ if (IS_ERR(dent))
+ goto out_remove;
+ d->dump_budg = dent;
+
+ fname = "dump_tnc";
+ dent = debugfs_create_file(fname, S_IWUGO, d->debugfs_dir, c,
+ &debugfs_fops);
+ if (IS_ERR(dent))
+ goto out_remove;
+ d->dump_tnc = dent;
+
+ return 0;
+
+out_remove:
+ err = PTR_ERR(dent);
+ ubifs_err("cannot create \"%s\" debugfs directory, error %d\n",
+ fname, err);
+ debugfs_remove_recursive(d->debugfs_dir);
+out:
+ return err;
+}
+
+/**
+ * dbg_debugfs_exit_fs - remove all debugfs files.
+ * @c: UBIFS file-system description object
+ */
+void dbg_debugfs_exit_fs(struct ubifs_info *c)
+{
+ debugfs_remove_recursive(c->dbg->debugfs_dir);
+}
+
#endif /* CONFIG_UBIFS_FS_DEBUG */