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Linux: Prevent destruction while showing mount devname 

Use ZFS_ENTER and ZFS_EXIT to protect datasets while their mount
devname is being retrieved.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ryan Moeller <ryan@iXsystems.com>
Closes #10892
Closes #10927
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Ryan Moeller 2020-09-15 18:40:03 -04:00 committed by GitHub
parent 085321621e
commit 37325e4749
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module/os/linux/zfs/zpl_super.c
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@ -187,10 +187,12 @@ __zpl_show_devname(struct seq_file *seq, zfsvfs_t *zfsvfs)
{ {
char *fsname; char *fsname;
ZFS_ENTER(zfsvfs);
fsname = kmem_alloc(ZFS_MAX_DATASET_NAME_LEN, KM_SLEEP); fsname = kmem_alloc(ZFS_MAX_DATASET_NAME_LEN, KM_SLEEP);
dmu_objset_name(zfsvfs->z_os, fsname); dmu_objset_name(zfsvfs->z_os, fsname);
seq_puts(seq, fsname); seq_puts(seq, fsname);
kmem_free(fsname, ZFS_MAX_DATASET_NAME_LEN); kmem_free(fsname, ZFS_MAX_DATASET_NAME_LEN);
ZFS_EXIT(zfsvfs);
return (0); return (0);
} }