Date: Thu, 23 Jul 2020 14:21:46 +0000 (UTC) From: Mark Johnston <markj@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r363447 - in head/cddl/contrib/opensolaris: cmd/zpool lib/libzfs/common Message-ID: <202007231421.06NELkjZ004070@repo.freebsd.org>
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Author: markj Date: Thu Jul 23 14:21:45 2020 New Revision: 363447 URL: https://svnweb.freebsd.org/changeset/base/363447 Log: MFOpenZFS: Fix zpool history unbounded memory usage In original implementation, zpool history will read the whole history before printing anything, causing memory usage goes unbounded. We fix this by breaking it into read-print iterations. Reviewed-by: Tom Caputi <tcaputi@datto.com> Reviewed-by: Matt Ahrens <matt@delphix.com> Reviewed-by: Igor Kozhukhov <igor@dilos.org> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Chunwei Chen <david.chen@nutanix.com> Closes #9516 Note, this change changes the libzfs.so ABI by modifying the prototype of zpool_get_history(). Since libzfs is effectively private to the base system it is anticipated that this will not be a problem. PR: 247557 Obtained from: OpenZFS Reported and tested by: Sam Vaughan <samjvaughan@gmail.com> Discussed with: freqlabs MFC after: 2 weeks Differential Revision: https://reviews.freebsd.org/D25745 openzfs/zfs@7125a109dcc55628336ff3f58e59e503f4d7694d Modified: head/cddl/contrib/opensolaris/cmd/zpool/zpool_main.c head/cddl/contrib/opensolaris/lib/libzfs/common/libzfs.h head/cddl/contrib/opensolaris/lib/libzfs/common/libzfs_pool.c Modified: head/cddl/contrib/opensolaris/cmd/zpool/zpool_main.c ============================================================================== --- head/cddl/contrib/opensolaris/cmd/zpool/zpool_main.c Thu Jul 23 14:03:37 2020 (r363446) +++ head/cddl/contrib/opensolaris/cmd/zpool/zpool_main.c Thu Jul 23 14:21:45 2020 (r363447) @@ -6226,25 +6226,13 @@ typedef struct hist_cbdata { boolean_t internal; } hist_cbdata_t; -/* - * Print out the command history for a specific pool. - */ -static int -get_history_one(zpool_handle_t *zhp, void *data) +static void +print_history_records(nvlist_t *nvhis, hist_cbdata_t *cb) { - nvlist_t *nvhis; nvlist_t **records; uint_t numrecords; - int ret, i; - hist_cbdata_t *cb = (hist_cbdata_t *)data; + int i; - cb->first = B_FALSE; - - (void) printf(gettext("History for '%s':\n"), zpool_get_name(zhp)); - - if ((ret = zpool_get_history(zhp, &nvhis)) != 0) - return (ret); - verify(nvlist_lookup_nvlist_array(nvhis, ZPOOL_HIST_RECORD, &records, &numrecords) == 0); for (i = 0; i < numrecords; i++) { @@ -6344,8 +6332,32 @@ get_history_one(zpool_handle_t *zhp, void *data) (void) printf("]"); (void) printf("\n"); } +} + +/* + * Print out the command history for a specific pool. + */ +static int +get_history_one(zpool_handle_t *zhp, void *data) +{ + nvlist_t *nvhis; + int ret; + hist_cbdata_t *cb = (hist_cbdata_t *)data; + uint64_t off = 0; + boolean_t eof = B_FALSE; + + cb->first = B_FALSE; + + (void) printf(gettext("History for '%s':\n"), zpool_get_name(zhp)); + + while (!eof) { + if ((ret = zpool_get_history(zhp, &nvhis, &off, &eof)) != 0) + return (ret); + + print_history_records(nvhis, cb); + nvlist_free(nvhis); + } (void) printf("\n"); - nvlist_free(nvhis); return (ret); } Modified: head/cddl/contrib/opensolaris/lib/libzfs/common/libzfs.h ============================================================================== --- head/cddl/contrib/opensolaris/lib/libzfs/common/libzfs.h Thu Jul 23 14:03:37 2020 (r363446) +++ head/cddl/contrib/opensolaris/lib/libzfs/common/libzfs.h Thu Jul 23 14:21:45 2020 (r363447) @@ -441,7 +441,8 @@ typedef enum { extern char *zpool_vdev_name(libzfs_handle_t *, zpool_handle_t *, nvlist_t *, int name_flags); extern int zpool_upgrade(zpool_handle_t *, uint64_t); -extern int zpool_get_history(zpool_handle_t *, nvlist_t **); +extern int zpool_get_history(zpool_handle_t *, nvlist_t **, uint64_t *, + boolean_t *); extern int zpool_history_unpack(char *, uint64_t, uint64_t *, nvlist_t ***, uint_t *); extern void zpool_obj_to_path(zpool_handle_t *, uint64_t, uint64_t, char *, Modified: head/cddl/contrib/opensolaris/lib/libzfs/common/libzfs_pool.c ============================================================================== --- head/cddl/contrib/opensolaris/lib/libzfs/common/libzfs_pool.c Thu Jul 23 14:03:37 2020 (r363446) +++ head/cddl/contrib/opensolaris/lib/libzfs/common/libzfs_pool.c Thu Jul 23 14:21:45 2020 (r363447) @@ -4124,33 +4124,37 @@ zpool_history_unpack(char *buf, uint64_t bytes_read, u * Retrieve the command history of a pool. */ int -zpool_get_history(zpool_handle_t *zhp, nvlist_t **nvhisp) +zpool_get_history(zpool_handle_t *zhp, nvlist_t **nvhisp, uint64_t *off, + boolean_t *eof) { char *buf; uint64_t buflen = HIS_BUF_LEN_DEF; - uint64_t off = 0; nvlist_t **records = NULL; uint_t numrecords = 0; int err, i; + uint64_t start = *off; buf = malloc(buflen); if (buf == NULL) return (ENOMEM); - do { + /* process about 1MB at a time */ + while (*off - start < 1024 * 1024) { uint64_t bytes_read = buflen; uint64_t leftover; - if ((err = get_history(zhp, buf, &off, &bytes_read)) != 0) + if ((err = get_history(zhp, buf, off, &bytes_read)) != 0) break; /* if nothing else was read in, we're at EOF, just return */ - if (bytes_read == 0) + if (bytes_read == 0) { + *eof = B_TRUE; break; + } if ((err = zpool_history_unpack(buf, bytes_read, &leftover, &records, &numrecords)) != 0) break; - off -= leftover; + *off -= leftover; if (leftover == bytes_read) { /* * no progress made, because buffer is not big enough @@ -4165,9 +4169,7 @@ zpool_get_history(zpool_handle_t *zhp, nvlist_t **nvhi break; } } - - /* CONSTCOND */ - } while (1); + } free(buf);
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