Commit 3bbf8b61 authored by Zhihao Cheng's avatar Zhihao Cheng Committed by openeuler-sync-bot
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ext4: Add debug message to notify user space is out of free 

hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I7CBCS


CVE: NA

--------------------------------

Add debug message to notify user that ext4_writepages is stuck in loop
caused by ENOSPC.

Signed-off-by: default avatarZhihao Cheng <chengzhihao1@huawei.com>
(cherry picked from commit 4ae7e703)
parent 5616fd86

fs/ext4/inode.c

+14 −0
Original line number Diff line number Diff line
@@ -2682,6 +2682,9 @@ static int ext4_writepages(struct address_space *mapping, 
	struct ext4_sb_info *sbi = EXT4_SB(mapping->host->i_sb);

	struct blk_plug plug;

	bool give_up_on_write = false;

	unsigned long retry_warn_ddl = 0;



#define RETRY_WARN_TIMEOUT (30 * HZ)



	if (unlikely(ext4_forced_shutdown(EXT4_SB(inode->i_sb))))

		return -EIO;
@@ -2863,6 +2866,15 @@ static int ext4_writepages(struct address_space *mapping, 
		mpd.io_submit.io_end = NULL;



		if (ret == -ENOSPC && sbi->s_journal) {

			if (!retry_warn_ddl) {

				retry_warn_ddl = jiffies + RETRY_WARN_TIMEOUT;

			} else if (time_after(jiffies, retry_warn_ddl)) {

				retry_warn_ddl = jiffies + RETRY_WARN_TIMEOUT;

				ext4_warning(inode->i_sb, "There are no free blocks available for writing pages, total free %llu, pending free %u, please delete big files to free space",

					ext4_count_free_clusters(inode->i_sb),

					sbi->s_mb_free_pending);

			}



			/*

			 * Commit the transaction which would

			 * free blocks released in the transaction
@@ -2871,6 +2883,8 @@ static int ext4_writepages(struct address_space *mapping, 
			jbd2_journal_force_commit_nested(sbi->s_journal);

			ret = 0;

			continue;

		} else {

			retry_warn_ddl = 0;

		}

		/* Fatal error - ENOMEM, EIO... */

		if (ret)