Merge tag 'ext4_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4

Pull ext4 updates from Ted Ts'o:
 "Convert ext4 to use the new mount API, and add support for the
  FS_IOC_GETFSLABEL and FS_IOC_SETFSLABEL ioctls.

  In addition the usual large number of clean ups and bug fixes, in
  particular for the fast_commit feature"

* tag 'ext4_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4: (48 commits)
  ext4: don't use the orphan list when migrating an inode
  ext4: use BUG_ON instead of if condition followed by BUG
  ext4: fix a copy and paste typo
  ext4: set csum seed in tmp inode while migrating to extents
  ext4: remove unnecessary 'offset' assignment
  ext4: remove redundant o_start statement
  ext4: drop an always true check
  ext4: remove unused assignments
  ext4: remove redundant statement
  ext4: remove useless resetting io_end_size in mpage_process_page()
  ext4: allow to change s_last_trim_minblks via sysfs
  ext4: change s_last_trim_minblks type to unsigned long
  ext4: implement support for get/set fs label
  ext4: only set EXT4_MOUNT_QUOTA when journalled quota file is specified
  ext4: don't use kfree() on rcu protected pointer sbi->s_qf_names
  ext4: avoid trim error on fs with small groups
  ext4: fix an use-after-free issue about data=journal writeback mode
  ext4: fix null-ptr-deref in '__ext4_journal_ensure_credits'
  ext4: initialize err_blk before calling __ext4_get_inode_loc
  ext4: fix a possible ABBA deadlock due to busy PA
  ...

1 files changed, 23 insertions, 8 deletions

diff --git a/fs/fs_parser.c b/fs/fs_parser.c
index 3df07c0e32b3..ed40ce5742fd 100644
--- a/fs/fs_parser.c
+++ b/fs/fs_parser.c
@@ -199,6 +199,8 @@ int fs_param_is_bool(struct p_log *log, const struct fs_parameter_spec *p,
 	int b;
 	if (param->type != fs_value_is_string)
 		return fs_param_bad_value(log, param);
+	if (!*param->string && (p->flags & fs_param_can_be_empty))
+		return 0;
 	b = lookup_constant(bool_names, param->string, -1);
 	if (b == -1)
 		return fs_param_bad_value(log, param);
@@ -211,8 +213,11 @@ int fs_param_is_u32(struct p_log *log, const struct fs_parameter_spec *p,
 		    struct fs_parameter *param, struct fs_parse_result *result)
 {
 	int base = (unsigned long)p->data;
-	if (param->type != fs_value_is_string ||
-	    kstrtouint(param->string, base, &result->uint_32) < 0)
+	if (param->type != fs_value_is_string)
+		return fs_param_bad_value(log, param);
+	if (!*param->string && (p->flags & fs_param_can_be_empty))
+		return 0;
+	if (kstrtouint(param->string, base, &result->uint_32) < 0)
 		return fs_param_bad_value(log, param);
 	return 0;
 }
@@ -221,8 +226,11 @@ EXPORT_SYMBOL(fs_param_is_u32);
 int fs_param_is_s32(struct p_log *log, const struct fs_parameter_spec *p,
 		    struct fs_parameter *param, struct fs_parse_result *result)
 {
-	if (param->type != fs_value_is_string ||
-	    kstrtoint(param->string, 0, &result->int_32) < 0)
+	if (param->type != fs_value_is_string)
+		return fs_param_bad_value(log, param);
+	if (!*param->string && (p->flags & fs_param_can_be_empty))
+		return 0;
+	if (kstrtoint(param->string, 0, &result->int_32) < 0)
 		return fs_param_bad_value(log, param);
 	return 0;
 }
@@ -231,8 +239,11 @@ EXPORT_SYMBOL(fs_param_is_s32);
 int fs_param_is_u64(struct p_log *log, const struct fs_parameter_spec *p,
 		    struct fs_parameter *param, struct fs_parse_result *result)
 {
-	if (param->type != fs_value_is_string ||
-	    kstrtoull(param->string, 0, &result->uint_64) < 0)
+	if (param->type != fs_value_is_string)
+		return fs_param_bad_value(log, param);
+	if (!*param->string && (p->flags & fs_param_can_be_empty))
+		return 0;
+	if (kstrtoull(param->string, 0, &result->uint_64) < 0)
 		return fs_param_bad_value(log, param);
 	return 0;
 }
@@ -244,6 +255,8 @@ int fs_param_is_enum(struct p_log *log, const struct fs_parameter_spec *p,
 	const struct constant_table *c;
 	if (param->type != fs_value_is_string)
 		return fs_param_bad_value(log, param);
+	if (!*param->string && (p->flags & fs_param_can_be_empty))
+		return 0;
 	c = __lookup_constant(p->data, param->string);
 	if (!c)
 		return fs_param_bad_value(log, param);
@@ -255,7 +268,8 @@ EXPORT_SYMBOL(fs_param_is_enum);
 int fs_param_is_string(struct p_log *log, const struct fs_parameter_spec *p,
 		       struct fs_parameter *param, struct fs_parse_result *result)
 {
-	if (param->type != fs_value_is_string || !*param->string)
+	if (param->type != fs_value_is_string ||
+	    (!*param->string && !(p->flags & fs_param_can_be_empty)))
 		return fs_param_bad_value(log, param);
 	return 0;
 }
@@ -275,7 +289,8 @@ int fs_param_is_fd(struct p_log *log, const struct fs_parameter_spec *p,
 {
 	switch (param->type) {
 	case fs_value_is_string:
-		if (kstrtouint(param->string, 0, &result->uint_32) < 0)
+		if ((!*param->string && !(p->flags & fs_param_can_be_empty)) ||
+		    kstrtouint(param->string, 0, &result->uint_32) < 0)
 			break;
 		if (result->uint_32 <= INT_MAX)
 			return 0;