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| author | mdf <mdf@FreeBSD.org> | 2011-01-27 00:34:12 +0000 |
|---|---|---|
| committer | mdf <mdf@FreeBSD.org> | 2011-01-27 00:34:12 +0000 |
| commit | 7fc649fc41274dcd3ffbed0d354a418b71e65786 (patch) | |
| tree | e4eadeb1ff33d6db2e7b3001b1b8a9e9c21e2a2f /sys/kern/subr_witness.c | |
| parent | 886222db75f8a2f0e19f97934a5375f602e0987a (diff) | |
| download | FreeBSD-src-7fc649fc41274dcd3ffbed0d354a418b71e65786.zip FreeBSD-src-7fc649fc41274dcd3ffbed0d354a418b71e65786.tar.gz | |
Explicitly wire the user buffer rather than doing it implicitly in
sbuf_new_for_sysctl(9). This allows using an sbuf with a SYSCTL_OUT
drain for extremely large amounts of data where the caller knows that
appropriate references are held, and sleeping is not an issue.
Inspired by: rwatson
Diffstat (limited to 'sys/kern/subr_witness.c')
| -rw-r--r-- | sys/kern/subr_witness.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/sys/kern/subr_witness.c b/sys/kern/subr_witness.c index 3fec4c4..e1c00fe 100644 --- a/sys/kern/subr_witness.c +++ b/sys/kern/subr_witness.c @@ -2544,6 +2544,10 @@ sysctl_debug_witness_fullgraph(SYSCTL_HANDLER_ARGS) return (error); } error = 0; + + error = sysctl_wire_old_buffer(req, 0); + if (error != 0) + return (error); sb = sbuf_new_for_sysctl(NULL, NULL, FULLGRAPH_SBUF_SIZE, req); if (sb == NULL) return (ENOMEM); |
