Date: Wed, 16 Oct 2019 06:44:38 +0000 (UTC) From: Andriy Gapon <avg@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-vendor@freebsd.org Subject: svn commit: r353617 - in vendor-sys/illumos/dist/uts/common/fs/zfs: . sys Message-ID: <201910160644.x9G6icC4089192@repo.freebsd.org>
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Author: avg Date: Wed Oct 16 06:44:37 2019 New Revision: 353617 URL: https://svnweb.freebsd.org/changeset/base/353617 Log: 9425 allow channel programs to be stopped via signals illumos/illumos-gate@d0cb1fb92629bc0283c88d4719df7285c1612700 https://github.com/illumos/illumos-gate/commit/d0cb1fb92629bc0283c88d4719df7285c1612700 https://www.illumos.org/issues/9425 Problem Statement ZFS Channel program scripts currently require a timeout, so that hung or long- running scripts return a timeout error instead of causing ZFS to get wedged. This limit can currently be set up to 100 million Lua instructions. Even with a limit in place, it would be desirable to have a sys admin (support engineer) be able to cancel a script that is taking a long time. Proposed Solution Make it possible to abort a channel program by sending an interrupt signal.In the underlying txg_wait_sync function, switch the cv_wait to a cv_wait_sig to catch the signal. Once a signal is encountered, the dsl_sync_task function can install a Lua hook that will get called before the Lua interpreter executes a new line of code. The dsl_sync_task can resume with a standard txg_wait_sync call and wait for the txg to complete. Meanwhile, the hook will abort the script and indicate that the channel program was canceled. The kernel returns a EINTR to indicate that the channel program run was canceled. Author: Don Brady <don.brady@delphix.com> Modified: vendor-sys/illumos/dist/uts/common/fs/zfs/dsl_synctask.c vendor-sys/illumos/dist/uts/common/fs/zfs/sys/dsl_synctask.h vendor-sys/illumos/dist/uts/common/fs/zfs/sys/txg.h vendor-sys/illumos/dist/uts/common/fs/zfs/sys/zcp.h vendor-sys/illumos/dist/uts/common/fs/zfs/txg.c vendor-sys/illumos/dist/uts/common/fs/zfs/zcp.c vendor-sys/illumos/dist/uts/common/fs/zfs/zfs_ioctl.c Modified: vendor-sys/illumos/dist/uts/common/fs/zfs/dsl_synctask.c ============================================================================== --- vendor-sys/illumos/dist/uts/common/fs/zfs/dsl_synctask.c Wed Oct 16 06:43:22 2019 (r353616) +++ vendor-sys/illumos/dist/uts/common/fs/zfs/dsl_synctask.c Wed Oct 16 06:44:37 2019 (r353617) @@ -41,7 +41,7 @@ dsl_null_checkfunc(void *arg, dmu_tx_t *tx) static int dsl_sync_task_common(const char *pool, dsl_checkfunc_t *checkfunc, - dsl_syncfunc_t *syncfunc, void *arg, + dsl_syncfunc_t *syncfunc, dsl_sigfunc_t *sigfunc, void *arg, int blocks_modified, zfs_space_check_t space_check, boolean_t early) { spa_t *spa; @@ -85,6 +85,11 @@ top: dmu_tx_commit(tx); + if (sigfunc != NULL && txg_wait_synced_sig(dp, dst.dst_txg)) { + /* current contract is to call func once */ + sigfunc(arg, tx); + sigfunc = NULL; /* in case of an EAGAIN retry */ + } txg_wait_synced(dp, dst.dst_txg); if (dst.dst_error == EAGAIN) { @@ -124,7 +129,7 @@ dsl_sync_task(const char *pool, dsl_checkfunc_t *check dsl_syncfunc_t *syncfunc, void *arg, int blocks_modified, zfs_space_check_t space_check) { - return (dsl_sync_task_common(pool, checkfunc, syncfunc, arg, + return (dsl_sync_task_common(pool, checkfunc, syncfunc, NULL, arg, blocks_modified, space_check, B_FALSE)); } @@ -146,8 +151,21 @@ dsl_early_sync_task(const char *pool, dsl_checkfunc_t dsl_syncfunc_t *syncfunc, void *arg, int blocks_modified, zfs_space_check_t space_check) { - return (dsl_sync_task_common(pool, checkfunc, syncfunc, arg, + return (dsl_sync_task_common(pool, checkfunc, syncfunc, NULL, arg, blocks_modified, space_check, B_TRUE)); +} + +/* + * A standard synctask that can be interrupted from a signal. The sigfunc + * is called once if a signal occurred while waiting for the task to sync. + */ +int +dsl_sync_task_sig(const char *pool, dsl_checkfunc_t *checkfunc, + dsl_syncfunc_t *syncfunc, dsl_sigfunc_t *sigfunc, void *arg, + int blocks_modified, zfs_space_check_t space_check) +{ + return (dsl_sync_task_common(pool, checkfunc, syncfunc, sigfunc, arg, + blocks_modified, space_check, B_FALSE)); } static void Modified: vendor-sys/illumos/dist/uts/common/fs/zfs/sys/dsl_synctask.h ============================================================================== --- vendor-sys/illumos/dist/uts/common/fs/zfs/sys/dsl_synctask.h Wed Oct 16 06:43:22 2019 (r353616) +++ vendor-sys/illumos/dist/uts/common/fs/zfs/sys/dsl_synctask.h Wed Oct 16 06:44:37 2019 (r353617) @@ -37,6 +37,7 @@ struct dsl_pool; typedef int (dsl_checkfunc_t)(void *, dmu_tx_t *); typedef void (dsl_syncfunc_t)(void *, dmu_tx_t *); +typedef void (dsl_sigfunc_t)(void *, dmu_tx_t *); typedef enum zfs_space_check { /* @@ -116,6 +117,8 @@ int dsl_early_sync_task(const char *, dsl_checkfunc_t dsl_syncfunc_t *, void *, int, zfs_space_check_t); void dsl_early_sync_task_nowait(struct dsl_pool *, dsl_syncfunc_t *, void *, int, zfs_space_check_t, dmu_tx_t *); +int dsl_sync_task_sig(const char *, dsl_checkfunc_t *, dsl_syncfunc_t *, + dsl_sigfunc_t *, void *, int, zfs_space_check_t); #ifdef __cplusplus } Modified: vendor-sys/illumos/dist/uts/common/fs/zfs/sys/txg.h ============================================================================== --- vendor-sys/illumos/dist/uts/common/fs/zfs/sys/txg.h Wed Oct 16 06:43:22 2019 (r353616) +++ vendor-sys/illumos/dist/uts/common/fs/zfs/sys/txg.h Wed Oct 16 06:44:37 2019 (r353617) @@ -88,6 +88,11 @@ extern void txg_kick(struct dsl_pool *dp); extern void txg_wait_synced(struct dsl_pool *dp, uint64_t txg); /* + * Wait as above. Returns true if the thread was signaled while waiting. + */ +extern boolean_t txg_wait_synced_sig(struct dsl_pool *dp, uint64_t txg); + +/* * Wait until the given transaction group, or one after it, is * the open transaction group. Try to make this happen as soon * as possible (eg. kick off any necessary syncs immediately). Modified: vendor-sys/illumos/dist/uts/common/fs/zfs/sys/zcp.h ============================================================================== --- vendor-sys/illumos/dist/uts/common/fs/zfs/sys/zcp.h Wed Oct 16 06:43:22 2019 (r353616) +++ vendor-sys/illumos/dist/uts/common/fs/zfs/sys/zcp.h Wed Oct 16 06:44:37 2019 (r353617) @@ -52,6 +52,12 @@ typedef struct zcp_cleanup_handler { list_node_t zch_node; } zcp_cleanup_handler_t; +typedef struct zcp_alloc_arg { + boolean_t aa_must_succeed; + int64_t aa_alloc_remaining; + int64_t aa_alloc_limit; +} zcp_alloc_arg_t; + typedef struct zcp_run_info { dsl_pool_t *zri_pool; @@ -94,6 +100,11 @@ typedef struct zcp_run_info { boolean_t zri_timed_out; /* + * Channel program was canceled by user + */ + boolean_t zri_canceled; + + /* * Boolean indicating whether or not we are running in syncing * context. */ @@ -104,6 +115,26 @@ typedef struct zcp_run_info { * triggered in the event of a fatal error. */ list_t zri_cleanup_handlers; + + /* + * The Lua state context of our channel program. + */ + lua_State *zri_state; + + /* + * Lua memory allocator arguments. + */ + zcp_alloc_arg_t *zri_allocargs; + + /* + * Contains output values from zcp script or error string. + */ + nvlist_t *zri_outnvl; + + /* + * The errno number returned to caller of zcp_eval(). + */ + int zri_result; } zcp_run_info_t; zcp_run_info_t *zcp_run_info(lua_State *); Modified: vendor-sys/illumos/dist/uts/common/fs/zfs/txg.c ============================================================================== --- vendor-sys/illumos/dist/uts/common/fs/zfs/txg.c Wed Oct 16 06:43:22 2019 (r353616) +++ vendor-sys/illumos/dist/uts/common/fs/zfs/txg.c Wed Oct 16 06:44:37 2019 (r353617) @@ -632,8 +632,8 @@ txg_delay(dsl_pool_t *dp, uint64_t txg, hrtime_t delay mutex_exit(&tx->tx_sync_lock); } -void -txg_wait_synced(dsl_pool_t *dp, uint64_t txg) +static boolean_t +txg_wait_synced_impl(dsl_pool_t *dp, uint64_t txg, boolean_t wait_sig) { tx_state_t *tx = &dp->dp_tx; @@ -652,9 +652,39 @@ txg_wait_synced(dsl_pool_t *dp, uint64_t txg) "tx_synced=%llu waiting=%llu dp=%p\n", tx->tx_synced_txg, tx->tx_sync_txg_waiting, dp); cv_broadcast(&tx->tx_sync_more_cv); - cv_wait(&tx->tx_sync_done_cv, &tx->tx_sync_lock); + if (wait_sig) { + /* + * Condition wait here but stop if the thread receives a + * signal. The caller may call txg_wait_synced*() again + * to resume waiting for this txg. + */ + if (cv_wait_sig(&tx->tx_sync_done_cv, + &tx->tx_sync_lock) == 0) { + mutex_exit(&tx->tx_sync_lock); + return (B_TRUE); + } + } else { + cv_wait(&tx->tx_sync_done_cv, &tx->tx_sync_lock); + } } mutex_exit(&tx->tx_sync_lock); + return (B_FALSE); +} + +void +txg_wait_synced(dsl_pool_t *dp, uint64_t txg) +{ + VERIFY0(txg_wait_synced_impl(dp, txg, B_FALSE)); +} + +/* + * Similar to a txg_wait_synced but it can be interrupted from a signal. + * Returns B_TRUE if the thread was signaled while waiting. + */ +boolean_t +txg_wait_synced_sig(dsl_pool_t *dp, uint64_t txg) +{ + return (txg_wait_synced_impl(dp, txg, B_TRUE)); } void Modified: vendor-sys/illumos/dist/uts/common/fs/zfs/zcp.c ============================================================================== --- vendor-sys/illumos/dist/uts/common/fs/zfs/zcp.c Wed Oct 16 06:43:22 2019 (r353616) +++ vendor-sys/illumos/dist/uts/common/fs/zfs/zcp.c Wed Oct 16 06:44:37 2019 (r353617) @@ -115,21 +115,6 @@ static int zcp_nvpair_value_to_lua(lua_State *, nvpair static int zcp_lua_to_nvlist_impl(lua_State *, int, nvlist_t *, const char *, int); -typedef struct zcp_alloc_arg { - boolean_t aa_must_succeed; - int64_t aa_alloc_remaining; - int64_t aa_alloc_limit; -} zcp_alloc_arg_t; - -typedef struct zcp_eval_arg { - lua_State *ea_state; - zcp_alloc_arg_t *ea_allocargs; - cred_t *ea_cred; - nvlist_t *ea_outnvl; - int ea_result; - uint64_t ea_instrlimit; -} zcp_eval_arg_t; - /* * The outer-most error callback handler for use with lua_pcall(). On * error Lua will call this callback with a single argument that @@ -449,7 +434,7 @@ zcp_lua_to_nvlist_helper(lua_State *state) static void zcp_convert_return_values(lua_State *state, nvlist_t *nvl, - const char *key, zcp_eval_arg_t *evalargs) + const char *key, int *result) { int err; VERIFY3U(1, ==, lua_gettop(state)); @@ -461,7 +446,7 @@ zcp_convert_return_values(lua_State *state, nvlist_t * err = lua_pcall(state, 3, 0, 0); /* zcp_lua_to_nvlist_helper */ if (err != 0) { zcp_lua_to_nvlist(state, 1, nvl, ZCP_RET_ERROR); - evalargs->ea_result = SET_ERROR(ECHRNG); + *result = SET_ERROR(ECHRNG); } } @@ -788,13 +773,24 @@ zcp_lua_alloc(void *ud, void *ptr, size_t osize, size_ static void zcp_lua_counthook(lua_State *state, lua_Debug *ar) { - /* - * If we're called, check how many instructions the channel program has - * executed so far, and compare against the limit. - */ lua_getfield(state, LUA_REGISTRYINDEX, ZCP_RUN_INFO_KEY); zcp_run_info_t *ri = lua_touserdata(state, -1); + /* + * Check if we were canceled while waiting for the + * txg to sync or from our open context thread + */ + if (ri->zri_canceled || + (!ri->zri_sync && issig(JUSTLOOKING) && issig(FORREAL))) { + ri->zri_canceled = B_TRUE; + (void) lua_pushstring(state, "Channel program was canceled."); + (void) lua_error(state); + } + + /* + * Check how many instructions the channel program has + * executed so far, and compare against the limit. + */ ri->zri_curinstrs += zfs_lua_check_instrlimit_interval; if (ri->zri_maxinstrs != 0 && ri->zri_curinstrs > ri->zri_maxinstrs) { ri->zri_timed_out = B_TRUE; @@ -813,31 +809,25 @@ zcp_panic_cb(lua_State *state) } static void -zcp_eval_impl(dmu_tx_t *tx, boolean_t sync, zcp_eval_arg_t *evalargs) +zcp_eval_impl(dmu_tx_t *tx, zcp_run_info_t *ri) { int err; - zcp_run_info_t ri; - lua_State *state = evalargs->ea_state; + lua_State *state = ri->zri_state; VERIFY3U(3, ==, lua_gettop(state)); + /* finish initializing our runtime state */ + ri->zri_pool = dmu_tx_pool(tx); + ri->zri_tx = tx; + list_create(&ri->zri_cleanup_handlers, sizeof (zcp_cleanup_handler_t), + offsetof(zcp_cleanup_handler_t, zch_node)); + /* * Store the zcp_run_info_t struct for this run in the Lua registry. * Registry entries are not directly accessible by the Lua scripts but * can be accessed by our callbacks. */ - ri.zri_space_used = 0; - ri.zri_pool = dmu_tx_pool(tx); - ri.zri_cred = evalargs->ea_cred; - ri.zri_tx = tx; - ri.zri_timed_out = B_FALSE; - ri.zri_sync = sync; - list_create(&ri.zri_cleanup_handlers, sizeof (zcp_cleanup_handler_t), - offsetof(zcp_cleanup_handler_t, zch_node)); - ri.zri_curinstrs = 0; - ri.zri_maxinstrs = evalargs->ea_instrlimit; - - lua_pushlightuserdata(state, &ri); + lua_pushlightuserdata(state, ri); lua_setfield(state, LUA_REGISTRYINDEX, ZCP_RUN_INFO_KEY); VERIFY3U(3, ==, lua_gettop(state)); @@ -854,7 +844,7 @@ zcp_eval_impl(dmu_tx_t *tx, boolean_t sync, zcp_eval_a * off control to the channel program. Channel programs that use too * much memory should die with ENOSPC. */ - evalargs->ea_allocargs->aa_must_succeed = B_FALSE; + ri->zri_allocargs->aa_must_succeed = B_FALSE; /* * Call the Lua function that open-context passed us. This pops the @@ -866,14 +856,14 @@ zcp_eval_impl(dmu_tx_t *tx, boolean_t sync, zcp_eval_a /* * Let Lua use KM_SLEEP while we interpret the return values. */ - evalargs->ea_allocargs->aa_must_succeed = B_TRUE; + ri->zri_allocargs->aa_must_succeed = B_TRUE; /* * Remove the error handler callback from the stack. At this point, * there shouldn't be any cleanup handler registered in the handler * list (zri_cleanup_handlers), regardless of whether it ran or not. */ - list_destroy(&ri.zri_cleanup_handlers); + list_destroy(&ri->zri_cleanup_handlers); lua_remove(state, 1); switch (err) { @@ -893,16 +883,16 @@ zcp_eval_impl(dmu_tx_t *tx, boolean_t sync, zcp_eval_a int return_count = lua_gettop(state); if (return_count == 1) { - evalargs->ea_result = 0; - zcp_convert_return_values(state, evalargs->ea_outnvl, - ZCP_RET_RETURN, evalargs); + ri->zri_result = 0; + zcp_convert_return_values(state, ri->zri_outnvl, + ZCP_RET_RETURN, &ri->zri_result); } else if (return_count > 1) { - evalargs->ea_result = SET_ERROR(ECHRNG); + ri->zri_result = SET_ERROR(ECHRNG); lua_settop(state, 0); (void) lua_pushfstring(state, "Multiple return " "values not supported"); - zcp_convert_return_values(state, evalargs->ea_outnvl, - ZCP_RET_ERROR, evalargs); + zcp_convert_return_values(state, ri->zri_outnvl, + ZCP_RET_ERROR, &ri->zri_result); } break; } @@ -916,14 +906,16 @@ zcp_eval_impl(dmu_tx_t *tx, boolean_t sync, zcp_eval_a * stack. */ VERIFY3U(1, ==, lua_gettop(state)); - if (ri.zri_timed_out) { - evalargs->ea_result = SET_ERROR(ETIME); + if (ri->zri_timed_out) { + ri->zri_result = SET_ERROR(ETIME); + } else if (ri->zri_canceled) { + ri->zri_result = SET_ERROR(EINTR); } else { - evalargs->ea_result = SET_ERROR(ECHRNG); + ri->zri_result = SET_ERROR(ECHRNG); } - zcp_convert_return_values(state, evalargs->ea_outnvl, - ZCP_RET_ERROR, evalargs); + zcp_convert_return_values(state, ri->zri_outnvl, + ZCP_RET_ERROR, &ri->zri_result); break; } case LUA_ERRERR: { @@ -934,14 +926,16 @@ zcp_eval_impl(dmu_tx_t *tx, boolean_t sync, zcp_eval_a * return the error message. */ VERIFY3U(1, ==, lua_gettop(state)); - if (ri.zri_timed_out) { - evalargs->ea_result = SET_ERROR(ETIME); + if (ri->zri_timed_out) { + ri->zri_result = SET_ERROR(ETIME); + } else if (ri->zri_canceled) { + ri->zri_result = SET_ERROR(EINTR); } else { - evalargs->ea_result = SET_ERROR(ECHRNG); + ri->zri_result = SET_ERROR(ECHRNG); } - zcp_convert_return_values(state, evalargs->ea_outnvl, - ZCP_RET_ERROR, evalargs); + zcp_convert_return_values(state, ri->zri_outnvl, + ZCP_RET_ERROR, &ri->zri_result); break; } case LUA_ERRMEM: @@ -949,7 +943,7 @@ zcp_eval_impl(dmu_tx_t *tx, boolean_t sync, zcp_eval_a * Lua ran out of memory while running the channel program. * There's not much we can do. */ - evalargs->ea_result = SET_ERROR(ENOSPC); + ri->zri_result = SET_ERROR(ENOSPC); break; default: VERIFY0(err); @@ -957,21 +951,35 @@ zcp_eval_impl(dmu_tx_t *tx, boolean_t sync, zcp_eval_a } static void -zcp_pool_error(zcp_eval_arg_t *evalargs, const char *poolname) +zcp_pool_error(zcp_run_info_t *ri, const char *poolname) { - evalargs->ea_result = SET_ERROR(ECHRNG); - lua_settop(evalargs->ea_state, 0); - (void) lua_pushfstring(evalargs->ea_state, "Could not open pool: %s", + ri->zri_result = SET_ERROR(ECHRNG); + lua_settop(ri->zri_state, 0); + (void) lua_pushfstring(ri->zri_state, "Could not open pool: %s", poolname); - zcp_convert_return_values(evalargs->ea_state, evalargs->ea_outnvl, - ZCP_RET_ERROR, evalargs); + zcp_convert_return_values(ri->zri_state, ri->zri_outnvl, + ZCP_RET_ERROR, &ri->zri_result); } +/* + * This callback is called when txg_wait_synced_sig encountered a signal. + * The txg_wait_synced_sig will continue to wait for the txg to complete + * after calling this callback. + */ +/* ARGSUSED */ static void +zcp_eval_sig(void *arg, dmu_tx_t *tx) +{ + zcp_run_info_t *ri = arg; + + ri->zri_canceled = B_TRUE; +} + +static void zcp_eval_sync(void *arg, dmu_tx_t *tx) { - zcp_eval_arg_t *evalargs = arg; + zcp_run_info_t *ri = arg; /* * Open context should have setup the stack to contain: @@ -979,15 +987,14 @@ zcp_eval_sync(void *arg, dmu_tx_t *tx) * 2: Script to run (converted to a Lua function) * 3: nvlist input to function (converted to Lua table or nil) */ - VERIFY3U(3, ==, lua_gettop(evalargs->ea_state)); + VERIFY3U(3, ==, lua_gettop(ri->zri_state)); - zcp_eval_impl(tx, B_TRUE, evalargs); + zcp_eval_impl(tx, ri); } static void -zcp_eval_open(zcp_eval_arg_t *evalargs, const char *poolname) +zcp_eval_open(zcp_run_info_t *ri, const char *poolname) { - int error; dsl_pool_t *dp; dmu_tx_t *tx; @@ -995,11 +1002,11 @@ zcp_eval_open(zcp_eval_arg_t *evalargs, const char *po /* * See comment from the same assertion in zcp_eval_sync(). */ - VERIFY3U(3, ==, lua_gettop(evalargs->ea_state)); + VERIFY3U(3, ==, lua_gettop(ri->zri_state)); error = dsl_pool_hold(poolname, FTAG, &dp); if (error != 0) { - zcp_pool_error(evalargs, poolname); + zcp_pool_error(ri, poolname); return; } @@ -1014,7 +1021,7 @@ zcp_eval_open(zcp_eval_arg_t *evalargs, const char *po */ tx = dmu_tx_create_dd(dp->dp_mos_dir); - zcp_eval_impl(tx, B_FALSE, evalargs); + zcp_eval_impl(tx, ri); dmu_tx_abort(tx); @@ -1027,7 +1034,7 @@ zcp_eval(const char *poolname, const char *program, bo { int err; lua_State *state; - zcp_eval_arg_t evalargs; + zcp_run_info_t runinfo; if (instrlimit > zfs_lua_max_instrlimit) return (SET_ERROR(EINVAL)); @@ -1127,24 +1134,29 @@ zcp_eval(const char *poolname, const char *program, bo } VERIFY3U(3, ==, lua_gettop(state)); - evalargs.ea_state = state; - evalargs.ea_allocargs = &allocargs; - evalargs.ea_instrlimit = instrlimit; - evalargs.ea_cred = CRED(); - evalargs.ea_outnvl = outnvl; - evalargs.ea_result = 0; + runinfo.zri_state = state; + runinfo.zri_allocargs = &allocargs; + runinfo.zri_outnvl = outnvl; + runinfo.zri_result = 0; + runinfo.zri_cred = CRED(); + runinfo.zri_timed_out = B_FALSE; + runinfo.zri_canceled = B_FALSE; + runinfo.zri_sync = sync; + runinfo.zri_space_used = 0; + runinfo.zri_curinstrs = 0; + runinfo.zri_maxinstrs = instrlimit; if (sync) { - err = dsl_sync_task(poolname, NULL, - zcp_eval_sync, &evalargs, 0, ZFS_SPACE_CHECK_ZCP_EVAL); + err = dsl_sync_task_sig(poolname, NULL, zcp_eval_sync, + zcp_eval_sig, &runinfo, 0, ZFS_SPACE_CHECK_ZCP_EVAL); if (err != 0) - zcp_pool_error(&evalargs, poolname); + zcp_pool_error(&runinfo, poolname); } else { - zcp_eval_open(&evalargs, poolname); + zcp_eval_open(&runinfo, poolname); } lua_close(state); - return (evalargs.ea_result); + return (runinfo.zri_result); } /* Modified: vendor-sys/illumos/dist/uts/common/fs/zfs/zfs_ioctl.c ============================================================================== --- vendor-sys/illumos/dist/uts/common/fs/zfs/zfs_ioctl.c Wed Oct 16 06:43:22 2019 (r353616) +++ vendor-sys/illumos/dist/uts/common/fs/zfs/zfs_ioctl.c Wed Oct 16 06:44:37 2019 (r353617) @@ -6347,7 +6347,7 @@ zfsdev_ioctl(dev_t dev, int cmd, intptr_t arg, int fla error = vec->zvec_func(zc->zc_name, innvl, outnvl); /* - * Some commands can partially execute, modfiy state, and still + * Some commands can partially execute, modify state, and still * return an error. In these cases, attempt to record what * was modified. */
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