Commit e9b37667 authored by Vahram Martirosyan's avatar Vahram Martirosyan Committed by Dave Kleikamp
Browse files

jfs: Several bugs in jfs_freeze() and jfs_unfreeze() 



The mentioned functions do not pay attention to the error codes returned
by the functions updateSuper(), lmLogInit() and lmLogShutdown(). It brings
to system crash later when writing to log.

The patch adds corresponding code to check and return the error codes
and to print correct error messages in case of errors.

Found by Linux File System Verification project (linuxtesting.org).

Signed-off-by: default avatarVahram Martirosyan <vahram.martirosyan@linuxtesting.org>
Reviewed-by: default avatarGu Zheng <guz.fnst@cn.fujitsu.com>
Signed-off-by: default avatarDave Kleikamp <dave.kleikamp@oracle.com>
parent 514e250f

fs/jfs/super.c

+30 −8
Original line number Diff line number Diff line
@@ -611,11 +611,28 @@ static int jfs_freeze(struct super_block *sb) 
{

	struct jfs_sb_info *sbi = JFS_SBI(sb);

	struct jfs_log *log = sbi->log;

	int rc = 0;



	if (!(sb->s_flags & MS_RDONLY)) {

		txQuiesce(sb);

		lmLogShutdown(log);

		updateSuper(sb, FM_CLEAN);

		rc = lmLogShutdown(log);

		if (rc) {

			jfs_error(sb, "jfs_freeze: lmLogShutdown failed");



			/* let operations fail rather than hang */

			txResume(sb);



			return rc;

		}

		rc = updateSuper(sb, FM_CLEAN);

		if (rc) {

			jfs_err("jfs_freeze: updateSuper failed\n");

			/*

			 * Don't fail here. Everything succeeded except

			 * marking the superblock clean, so there's really

			 * no harm in leaving it frozen for now.

			 */

		}

	}

	return 0;

}
@@ -627,13 +644,18 @@ static int jfs_unfreeze(struct super_block *sb) 
	int rc = 0;



	if (!(sb->s_flags & MS_RDONLY)) {

		updateSuper(sb, FM_MOUNT);

		if ((rc = lmLogInit(log)))

			jfs_err("jfs_unlock failed with return code %d", rc);

		else

		rc = updateSuper(sb, FM_MOUNT);

		if (rc) {

			jfs_error(sb, "jfs_unfreeze: updateSuper failed");

			goto out;

		}

		rc = lmLogInit(log);

		if (rc)

			jfs_error(sb, "jfs_unfreeze: lmLogInit failed");

out:

		txResume(sb);

	}

	return 0;

	return rc;

}



static struct dentry *jfs_do_mount(struct file_system_type *fs_type,

CRA Git | Maintained and supported by SUSTech CRA and CCSE