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Spurious ENOMEM returns when reading dbufs kstat

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Commit 7b2d78a046aa4695d434478a439a9438521d73af fixed some improper uses
of snprintf(), however, in __dbuf_stats_hash_table_data() the return
value of snprintf is propagated to the caller.  This caused spurious
ENOMEM errors when reading the dbufs kstat.

This commit causes the actual number of characters written to be returned.

Signed-off-by: Tim Chase <tim@chase2k.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #3072
This commit is contained in:
Tim Chase 2015-02-02 23:55:20 -06:00 committed by Brian Behlendorf
parent 037763e44e
commit aa2ef419e4
1 changed files with 6 additions and 2 deletions
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8
module/zfs/dbuf_stats.c
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@ -67,6 +67,7 @@ __dbuf_stats_hash_table_data(char *buf, size_t size, dmu_buf_impl_t *db)
arc_buf_info_t abi = { 0 };
dmu_object_info_t doi = { 0 };
dnode_t *dn = DB_DNODE(db);
size_t nwritten;
if (db->db_buf)
arc_buf_info(db->db_buf, &abi, zfs_dbuf_state_index);
@ -74,7 +75,7 @@ __dbuf_stats_hash_table_data(char *buf, size_t size, dmu_buf_impl_t *db)
if (dn)
__dmu_object_info_from_dnode(dn, &doi);
(void) snprintf(buf, size,
nwritten = snprintf(buf, size,
"%-16s %-8llu %-8lld %-8lld %-8lld %-8llu %-8llu %-5d %-5d %-5lu | "
"%-5d %-5d %-6lld 0x%-6x %-6lu %-8llu %-12llu "
"%-6lu %-6lu %-6lu %-6lu %-6lu %-8llu %-8llu %-8d %-5lu | "
@ -118,7 +119,10 @@ __dbuf_stats_hash_table_data(char *buf, size_t size, dmu_buf_impl_t *db)
(u_longlong_t)doi.doi_fill_count,
(u_longlong_t)doi.doi_max_offset);
return (size);
if (nwritten >= size)
return (size);
return (nwritten + 1);
}
static int