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, 19 insertions, 17 deletions

diff --git a/fs/ext4/sysfs.c b/fs/ext4/sysfs.c
index 2314f7446592..f61e65ae27d8 100644
--- a/fs/ext4/sysfs.c
+++ b/fs/ext4/sysfs.c
@@ -63,7 +63,7 @@ static ssize_t session_write_kbytes_show(struct ext4_sb_info *sbi, char *buf)
 {
 	struct super_block *sb = sbi->s_buddy_cache->i_sb;
 
-	return snprintf(buf, PAGE_SIZE, "%lu\n",
+	return sysfs_emit(buf, "%lu\n",
 			(part_stat_read(sb->s_bdev, sectors[STAT_WRITE]) -
 			 sbi->s_sectors_written_start) >> 1);
 }
@@ -72,7 +72,7 @@ static ssize_t lifetime_write_kbytes_show(struct ext4_sb_info *sbi, char *buf)
 {
 	struct super_block *sb = sbi->s_buddy_cache->i_sb;
 
-	return snprintf(buf, PAGE_SIZE, "%llu\n",
+	return sysfs_emit(buf, "%llu\n",
 			(unsigned long long)(sbi->s_kbytes_written +
 			((part_stat_read(sb->s_bdev, sectors[STAT_WRITE]) -
 			  EXT4_SB(sb)->s_sectors_written_start) >> 1)));
@@ -130,8 +130,8 @@ static ssize_t trigger_test_error(struct ext4_sb_info *sbi,
 static ssize_t journal_task_show(struct ext4_sb_info *sbi, char *buf)
 {
 	if (!sbi->s_journal)
-		return snprintf(buf, PAGE_SIZE, "<none>\n");
-	return snprintf(buf, PAGE_SIZE, "%d\n",
+		return sysfs_emit(buf, "<none>\n");
+	return sysfs_emit(buf, "%d\n",
 			task_pid_vnr(sbi->s_journal->j_task));
 }
 
@@ -245,6 +245,7 @@ EXT4_ATTR(last_error_time, 0444, last_error_time);
 EXT4_ATTR(journal_task, 0444, journal_task);
 EXT4_RW_ATTR_SBI_UI(mb_prefetch, s_mb_prefetch);
 EXT4_RW_ATTR_SBI_UI(mb_prefetch_limit, s_mb_prefetch_limit);
+EXT4_RW_ATTR_SBI_UL(last_trim_minblks, s_last_trim_minblks);
 
 static unsigned int old_bump_val = 128;
 EXT4_ATTR_PTR(max_writeback_mb_bump, 0444, pointer_ui, &old_bump_val);
@@ -295,6 +296,7 @@ static struct attribute *ext4_attrs[] = {
 #endif
 	ATTR_LIST(mb_prefetch),
 	ATTR_LIST(mb_prefetch_limit),
+	ATTR_LIST(last_trim_minblks),
 	NULL,
 };
 ATTRIBUTE_GROUPS(ext4);
@@ -357,7 +359,7 @@ static void *calc_ptr(struct ext4_attr *a, struct ext4_sb_info *sbi)
 
 static ssize_t __print_tstamp(char *buf, __le32 lo, __u8 hi)
 {
-	return snprintf(buf, PAGE_SIZE, "%lld\n",
+	return sysfs_emit(buf, "%lld\n",
 			((time64_t)hi << 32) + le32_to_cpu(lo));
 }
 
@@ -374,7 +376,7 @@ static ssize_t ext4_attr_show(struct kobject *kobj,
 
 	switch (a->attr_id) {
 	case attr_delayed_allocation_blocks:
-		return snprintf(buf, PAGE_SIZE, "%llu\n",
+		return sysfs_emit(buf, "%llu\n",
 				(s64) EXT4_C2B(sbi,
 		       percpu_counter_sum(&sbi->s_dirtyclusters_counter)));
 	case attr_session_write_kbytes:
@@ -382,11 +384,11 @@ static ssize_t ext4_attr_show(struct kobject *kobj,
 	case attr_lifetime_write_kbytes:
 		return lifetime_write_kbytes_show(sbi, buf);
 	case attr_reserved_clusters:
-		return snprintf(buf, PAGE_SIZE, "%llu\n",
+		return sysfs_emit(buf, "%llu\n",
 				(unsigned long long)
 				atomic64_read(&sbi->s_resv_clusters));
 	case attr_sra_exceeded_retry_limit:
-		return snprintf(buf, PAGE_SIZE, "%llu\n",
+		return sysfs_emit(buf, "%llu\n",
 				(unsigned long long)
 			percpu_counter_sum(&sbi->s_sra_exceeded_retry_limit));
 	case attr_inode_readahead:
@@ -394,42 +396,42 @@ static ssize_t ext4_attr_show(struct kobject *kobj,
 		if (!ptr)
 			return 0;
 		if (a->attr_ptr == ptr_ext4_super_block_offset)
-			return snprintf(buf, PAGE_SIZE, "%u\n",
+			return sysfs_emit(buf, "%u\n",
 					le32_to_cpup(ptr));
 		else
-			return snprintf(buf, PAGE_SIZE, "%u\n",
+			return sysfs_emit(buf, "%u\n",
 					*((unsigned int *) ptr));
 	case attr_pointer_ul:
 		if (!ptr)
 			return 0;
-		return snprintf(buf, PAGE_SIZE, "%lu\n",
+		return sysfs_emit(buf, "%lu\n",
 				*((unsigned long *) ptr));
 	case attr_pointer_u8:
 		if (!ptr)
 			return 0;
-		return snprintf(buf, PAGE_SIZE, "%u\n",
+		return sysfs_emit(buf, "%u\n",
 				*((unsigned char *) ptr));
 	case attr_pointer_u64:
 		if (!ptr)
 			return 0;
 		if (a->attr_ptr == ptr_ext4_super_block_offset)
-			return snprintf(buf, PAGE_SIZE, "%llu\n",
+			return sysfs_emit(buf, "%llu\n",
 					le64_to_cpup(ptr));
 		else
-			return snprintf(buf, PAGE_SIZE, "%llu\n",
+			return sysfs_emit(buf, "%llu\n",
 					*((unsigned long long *) ptr));
 	case attr_pointer_string:
 		if (!ptr)
 			return 0;
-		return snprintf(buf, PAGE_SIZE, "%.*s\n", a->attr_size,
+		return sysfs_emit(buf, "%.*s\n", a->attr_size,
 				(char *) ptr);
 	case attr_pointer_atomic:
 		if (!ptr)
 			return 0;
-		return snprintf(buf, PAGE_SIZE, "%d\n",
+		return sysfs_emit(buf, "%d\n",
 				atomic_read((atomic_t *) ptr));
 	case attr_feature:
-		return snprintf(buf, PAGE_SIZE, "supported\n");
+		return sysfs_emit(buf, "supported\n");
 	case attr_first_error_time:
 		return print_tstamp(buf, sbi->s_es, s_first_error_time);
 	case attr_last_error_time: