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Don't count '@' for dataset namelen if not a snapshot 

Don't count '@' for dataset namelen if not a snapshot.  This
fixes making a pool unimportable when the  dataset namelen
is 255.

Add test file for zfs create name length 255.

Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Chunwei Chen <david.chen@osnexus.com>
Closes #5432
Closes #5456
This commit is contained in:
Chunwei Chen 2016-12-09 10:52:08 -08:00 committed by Brian Behlendorf
parent 625ee0a5e0
commit f3da7a1b40
1 changed files with 5 additions and 1 deletions
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6
module/zfs/dsl_dataset.c
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@ -671,7 +671,11 @@ dsl_dataset_namelen(dsl_dataset_t *ds)
int len;
VERIFY0(dsl_dataset_get_snapname(ds));
mutex_enter(&ds->ds_lock);
len = dsl_dir_namelen(ds->ds_dir) + 1 + strlen(ds->ds_snapname);
len = strlen(ds->ds_snapname);
/* add '@' if ds is a snap */
if (len > 0)
len++;
len += dsl_dir_namelen(ds->ds_dir);
mutex_exit(&ds->ds_lock);
return (len);
}