/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License (the "License"). * You may not use this file except in compliance with the License. * * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * When distributing Covered Code, include this CDDL HEADER in each * file and include the License file at usr/src/OPENSOLARIS.LICENSE. * If applicable, add the following below this CDDL HEADER, with the * fields enclosed by brackets "[]" replaced with your own identifying * information: Portions Copyright [yyyy] [name of copyright owner] * * CDDL HEADER END */ /* * Copyright 2006 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ #pragma ident "%Z%%M% %I% %E% SMI" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define NUM_RECORDS_TO_WRITE 256 #define NUM_BYTES_TO_WRITE 65536 extern krwlock_t exported_lock; static int nfslog_num_records_to_write = NUM_RECORDS_TO_WRITE; static int nfslog_num_bytes_to_write = NUM_BYTES_TO_WRITE; /* * This struct is used to 'hide' the details of managing the log * records internally to the logging code. Allocation routines * are used to obtain pieces of memory for XDR encoding. This struct * is a 'header' to those areas and a opaque cookie is used to pass * this data structure between the allocating function and the put * function. */ struct lr_alloc { struct lr_alloc *next; /* links for write queuing */ struct lr_alloc *prev; #define LR_ALLOC_NOFREE 0x1 /* not present, call free */ int lr_flags; caddr_t log_record; /* address to XDR encoding */ size_t size; /* final size of encoding */ struct kmem_cache *alloc_cache; /* keep track of cache ptr */ struct exportinfo *exi; /* who are we related to? */ struct log_buffer *lb; }; struct flush_thread_params { struct nfsl_flush_args tp_args; int tp_error; }; static int log_file_create(caddr_t, struct log_file **); static void log_file_rele(struct log_file *); static struct log_buffer *log_buffer_create(caddr_t); static void log_buffer_rele(struct log_buffer *); static int nfslog_record_append2all(struct lr_alloc *); static int nfslog_logbuffer_rename(struct log_buffer *); static void nfslog_logfile_wait(struct log_file *); static int nfslog_logfile_rename(char *, char *); static void nfslog_do_flush(struct flush_thread_params *); static void create_buffer_header(caddr_t *, size_t *, size_t *); static int nfslog_write_logrecords(struct log_file *, struct lr_alloc *, int); static void nfslog_free_logrecords(struct lr_alloc *); static int nfslog_records_flush_to_disk(struct log_buffer *); static int nfslog_records_flush_to_disk_nolock(struct log_buffer *); /* * Read/Write lock that protects 'nfslog_buffer_list'. * This lock must be held when searching or modifying 'nfslog_buffer_list'. */ static krwlock_t nfslog_buffer_list_lock; /* * The list of "log_buffer" structures. */ struct log_buffer *nfslog_buffer_list = NULL; #define LOG_BUFFER_HOLD(lbp) { \ mutex_enter(&(lbp)->lb_lock); \ (lbp)->lb_refcnt++; \ mutex_exit(&(lbp)->lb_lock); \ } #define LOG_FILE_HOLD(lfp) { \ mutex_enter(&(lfp)->lf_lock); \ (lfp)->lf_refcnt++; \ mutex_exit(&(lfp)->lf_lock); \ } #define LOG_FILE_RELE(lfp) { \ log_file_rele(lfp); \ } /* * These two macros are used to prep a logfile data structure and * associated file for writing data. Note that the lf_lock is * held as a result of the call to the first macro. This is used * for serialization correctness between the logbuffer struct and * the logfile struct. */ #define LOG_FILE_LOCK_TO_WRITE(lfp) { \ mutex_enter(&(lfp)->lf_lock); \ (lfp)->lf_refcnt++; \ (lfp)->lf_writers++; \ } #define LOG_FILE_UNLOCK_FROM_WRITE(lfp) { \ (lfp)->lf_writers--; \ if ((lfp)->lf_writers == 0 && ((lfp)->lf_flags & L_WAITING)) { \ (lfp)->lf_flags &= ~L_WAITING; \ cv_broadcast(&(lfp)->lf_cv_waiters); \ } \ mutex_exit(&(lfp)->lf_lock); \ log_file_rele(lfp); \ } int rfsl_log_buffer = 0; static int rfsl_log_file = 0; /* This array is used for memory allocation of record encoding spaces */ static struct { int size; struct kmem_cache *mem_cache; char *cache_name; } nfslog_mem_alloc[] = { #define SMALL_INDX 0 { NFSLOG_SMALL_RECORD_SIZE - sizeof (struct lr_alloc), NULL, NFSLOG_SMALL_REC_NAME }, #define MEDIUM_INDX 1 { NFSLOG_MEDIUM_RECORD_SIZE - sizeof (struct lr_alloc), NULL, NFSLOG_MEDIUM_REC_NAME }, #define LARGE_INDX 2 { NFSLOG_LARGE_RECORD_SIZE - sizeof (struct lr_alloc), NULL, NFSLOG_LARGE_REC_NAME }, { (-1), NULL } }; /* Used to calculate the 'real' allocation size */ #define ALLOC_SIZE(index) \ (nfslog_mem_alloc[index].size + sizeof (struct lr_alloc)) /* * Initialize logging data buffer cache */ void nfslog_init() { int indx; rw_init(&nfslog_buffer_list_lock, NULL, RW_DEFAULT, NULL); /* * Initialize the kmem caches for encoding */ for (indx = 0; nfslog_mem_alloc[indx].size != (-1); indx++) { nfslog_mem_alloc[indx].mem_cache = kmem_cache_create(nfslog_mem_alloc[indx].cache_name, ALLOC_SIZE(indx), 0, NULL, NULL, NULL, NULL, NULL, 0); } } /* * Sets up the necessary log file and related buffers to enable logging * on the given export point. * Returns 0 on success, non-zero on failure. */ int nfslog_setup(struct exportinfo *exi) { struct exportdata *kex; struct log_buffer *lbp; struct log_buffer *nlbp; kex = &exi->exi_export; ASSERT(kex->ex_flags & EX_LOG); /* * Logging is enabled for the new export point, check * the existing log_buffer structures to see if the * desired buffer has already been opened. If so, point * the new exportinfo's exi_logbuffer to the existing * one. */ rw_enter(&nfslog_buffer_list_lock, RW_READER); for (lbp = nfslog_buffer_list; lbp != NULL; lbp = lbp->lb_next) { LOGGING_DPRINT((10, "searching for buffer... found log_buffer '%s'\n", lbp->lb_path)); if (strcmp(lbp->lb_path, kex->ex_log_buffer) == 0) { /* Found our match. Ref it and return */ LOG_BUFFER_HOLD(lbp); exi->exi_logbuffer = lbp; LOGGING_DPRINT((10, "\tfound log_buffer for '%s'\n", kex->ex_log_buffer)); rw_exit(&nfslog_buffer_list_lock); return (0); } } rw_exit(&nfslog_buffer_list_lock); /* * New buffer needed, allocate it. * The buffer list lock has been dropped so we will need to search * the list again to ensure that another thread has not added * a matching buffer. */ if ((nlbp = log_buffer_create(kex->ex_log_buffer)) == NULL) { /* * Failed the buffer creation for some reason so we * will need to return. */ return (EIO); } rw_enter(&nfslog_buffer_list_lock, RW_WRITER); for (lbp = nfslog_buffer_list; lbp != NULL; lbp = lbp->lb_next) { if (strcmp(lbp->lb_path, kex->ex_log_buffer) == 0) { /* * A log_buffer already exists for the * indicated buffer, use it instead. */ LOG_BUFFER_HOLD(lbp); exi->exi_logbuffer = lbp; LOGGING_DPRINT((10, "found log_buffer for '%s' " "after allocation\n", kex->ex_log_buffer)); rw_exit(&nfslog_buffer_list_lock); log_buffer_rele(nlbp); return (0); } } /* * Didn't find an existing log_buffer for this buffer, * use the the newly created one, and add to list. We * increment the reference count because the node is * entered into the global list. */ LOGGING_DPRINT((10, "exportfs: adding nlbp=%p to list\n", nlbp)); nlbp->lb_next = nfslog_buffer_list; nfslog_buffer_list = nlbp; LOG_BUFFER_HOLD(nlbp); /* hold is for export entry */ exi->exi_logbuffer = nlbp; rw_exit(&nfslog_buffer_list_lock); return (0); } /* * Disables logging for the given export point. */ void nfslog_disable(struct exportinfo *exi) { log_buffer_rele(exi->exi_logbuffer); } /* * Creates the corresponding log_buffer and log_file structures * for the the buffer named 'name'. * Returns a pointer to the log_buffer structure with reference one. */ static struct log_buffer * log_buffer_create(caddr_t name) { struct log_buffer *buffer; struct log_file *logfile; int namelen = strlen(name); LOGGING_DPRINT((10, "log_buffer_create: %s\n", name)); if (log_file_create(name, &logfile)) return (NULL); buffer = (struct log_buffer *)kmem_alloc(sizeof (*buffer), KM_SLEEP); buffer->lb_refcnt = 1; buffer->lb_rec_id = 0; buffer->lb_path = (caddr_t)kmem_alloc(namelen + 1, KM_SLEEP); bcopy(name, buffer->lb_path, namelen + 1); buffer->lb_logfile = logfile; buffer->lb_records = NULL; buffer->lb_num_recs = 0; buffer->lb_size_queued = 0; mutex_init(&buffer->lb_lock, NULL, MUTEX_DEFAULT, NULL); rfsl_log_buffer++; return (buffer); } /* * Release a log_buffer structure */ static void log_buffer_rele(struct log_buffer *lbp) { int len; mutex_enter(&lbp->lb_lock); if (--lbp->lb_refcnt > 1) { mutex_exit(&lbp->lb_lock); return; } if (lbp->lb_refcnt < 0) { panic("log_rele: log_buffer refcnt < 0"); /*NOTREACHED*/ } /* * Need to drop the lb_lock before acquiring the * nfslog_buffer_list_lock. To avoid double free we need * to hold an additional reference to the log buffer. * This will ensure that no two threads will simultaneously * be trying to free the same log buffer. */ if (lbp->lb_refcnt == 1) { /* * If the ref count is 1, then the last * unshare/reference has been given up and we need to * clean up the buffer and remove it from the buffer * list. */ LOGGING_DPRINT((10, "log_buffer_rele lbp=%p disconnecting\n", lbp)); /* * Hold additional reference before dropping the lb_lock */ lbp->lb_refcnt++; mutex_exit(&lbp->lb_lock); /* * Make sure that all of the buffered records are written. * Don't bother checking the write return value since there * isn't much we can do at this point. */ (void) nfslog_records_flush_to_disk(lbp); rw_enter(&nfslog_buffer_list_lock, RW_WRITER); mutex_enter(&lbp->lb_lock); /* * Drop the reference count held above. * If the ref count is still > 1 then someone has * stepped in to use this log buffer. unlock and return. */ if (--lbp->lb_refcnt > 1) { mutex_exit(&lbp->lb_lock); rw_exit(&nfslog_buffer_list_lock); return; } if (lbp == nfslog_buffer_list) { nfslog_buffer_list = lbp->lb_next; } else { struct log_buffer *tlbp; /* Drop the log_buffer from the master list */ for (tlbp = nfslog_buffer_list; tlbp->lb_next != NULL; tlbp = tlbp->lb_next) { if (tlbp->lb_next == lbp) { tlbp->lb_next = lbp->lb_next; break; } } } mutex_exit(&lbp->lb_lock); rw_exit(&nfslog_buffer_list_lock); } /* * ref count zero; finish clean up. */ LOGGING_DPRINT((10, "log_buffer_rele lbp=%p freeing\n", lbp)); log_file_rele(lbp->lb_logfile); len = strlen(lbp->lb_path) + 1; kmem_free(lbp->lb_path, len); kmem_free(lbp, sizeof (*lbp)); rfsl_log_buffer--; } /* * Creates the corresponding log_file structure for the buffer * named 'log_file_name'. * 'log_file_name' is created by concatenating 'origname' and LOG_INPROG_STRING. * 'logfile' is set to be the log_file structure with reference one. */ static int log_file_create(caddr_t origname, struct log_file **lfpp) { vnode_t *vp = NULL; char *name; int namelen; int error; struct log_file *logfile = NULL; vattr_t va; caddr_t loghdr = NULL; size_t loghdr_len = 0; size_t loghdr_free = 0; namelen = strlen(origname) + strlen(LOG_INPROG_STRING); name = (caddr_t)kmem_alloc(namelen + 1, KM_SLEEP); (void) sprintf(name, "%s%s", origname, LOG_INPROG_STRING); LOGGING_DPRINT((3, "log_file_create: %s\n", name)); if (error = vn_open(name, UIO_SYSSPACE, FCREAT|FWRITE|FOFFMAX, LOG_MODE, &vp, CRCREAT, 0)) { nfs_cmn_err(error, CE_WARN, "log_file_create: Can not open %s - error %m", name); goto out; } LOGGING_DPRINT((3, "log_file_create: %s vp=%p v_count=%d\n", name, vp, vp->v_count)); logfile = (struct log_file *)kmem_zalloc(sizeof (*logfile), KM_SLEEP); logfile->lf_path = name; /* * No need to bump the vnode reference count since it is set * to one by vn_open(). */ logfile->lf_vp = vp; logfile->lf_refcnt = 1; mutex_init(&logfile->lf_lock, NULL, MUTEX_DEFAULT, NULL); rfsl_log_file++; va.va_mask = AT_SIZE; error = VOP_GETATTR(vp, &va, 0, CRED()); if (error) { nfs_cmn_err(error, CE_WARN, "log_file_create: Can not stat %s - error = %m", name); goto out; } if (va.va_size == 0) { struct lr_alloc lr; /* * Write Header. */ create_buffer_header(&loghdr, &loghdr_len, &loghdr_free); /* * Dummy up a lr_alloc struct for the write */ lr.next = lr.prev = &lr; lr.lr_flags = 0; lr.log_record = loghdr; lr.size = loghdr_len; lr.alloc_cache = NULL; lr.exi = NULL; lr.lb = NULL; mutex_enter(&logfile->lf_lock); error = nfslog_write_logrecords(logfile, &lr, 1); mutex_exit(&logfile->lf_lock); if (error != 0) { nfs_cmn_err(error, CE_WARN, "log_file_create: Can not write header " "on %s - error = %m", name); goto out; } } *lfpp = logfile; if (loghdr != NULL) kmem_free(loghdr, loghdr_free); return (0); out: if (vp != NULL) { int error1; error1 = VOP_CLOSE(vp, FCREAT|FWRITE|FOFFMAX, 1, (offset_t)0, CRED()); if (error1) { nfs_cmn_err(error1, CE_WARN, "log_file_create: Can not close %s - " "error = %m", name); } VN_RELE(vp); } kmem_free(name, namelen + 1); if (logfile != NULL) { mutex_destroy(&logfile->lf_lock); kmem_free(logfile, sizeof (*logfile)); rfsl_log_file--; } if (loghdr != NULL) kmem_free(loghdr, loghdr_free); return (error); } /* * Release a log_file structure */ static void log_file_rele(struct log_file *lfp) { int len; int error; mutex_enter(&lfp->lf_lock); if (--lfp->lf_refcnt > 0) { LOGGING_DPRINT((10, "log_file_rele lfp=%p decremented refcnt to %d\n", lfp, lfp->lf_refcnt)); mutex_exit(&lfp->lf_lock); return; } if (lfp->lf_refcnt < 0) { panic("log_file_rele: log_file refcnt < 0"); /*NOTREACHED*/ } LOGGING_DPRINT((10, "log_file_rele lfp=%p freeing node\n", lfp)); lfp->lf_flags &= ~(L_PRINTED | L_ERROR); ASSERT(lfp->lf_flags == 0); ASSERT(lfp->lf_writers == 0); if (error = VOP_CLOSE(lfp->lf_vp, FCREAT|FWRITE|FOFFMAX, 1, (offset_t)0, CRED())) { nfs_cmn_err(error, CE_WARN, "NFS: Could not close log buffer %s - error = %m", lfp->lf_path); #ifdef DEBUG } else { LOGGING_DPRINT((3, "log_file_rele: %s has been closed vp=%p " "v_count=%d\n", lfp->lf_path, lfp->lf_vp, lfp->lf_vp->v_count)); #endif } VN_RELE(lfp->lf_vp); len = strlen(lfp->lf_path) + 1; kmem_free(lfp->lf_path, len); kmem_free(lfp, sizeof (*lfp)); rfsl_log_file--; } /* * Allocates a record of the size specified. * 'exi' identifies the exportinfo structure being logged. * 'size' indicates how much memory should be allocated * 'cookie' is used to store an opaque value for the caller for later use * 'flags' currently ignored. * * Returns a pointer to the beginning of the allocated memory. * 'cookie' is a pointer to the 'lr_alloc' struct; this will be used * to keep track of the encoded record and contains all the info * for enqueuing the record on the log buffer for later writing. * * nfslog_record_put() must be used to 'free' this record or allocation. */ /* ARGSUSED */ void * nfslog_record_alloc( struct exportinfo *exi, int alloc_indx, void **cookie, int flags) { struct lr_alloc *lrp; lrp = (struct lr_alloc *) kmem_cache_alloc(nfslog_mem_alloc[alloc_indx].mem_cache, KM_NOSLEEP); if (lrp == NULL) { *cookie = NULL; return (NULL); } lrp->next = lrp; lrp->prev = lrp; lrp->lr_flags = 0; lrp->log_record = (caddr_t)((uintptr_t)lrp + (uintptr_t)sizeof (struct lr_alloc)); lrp->size = nfslog_mem_alloc[alloc_indx].size; lrp->alloc_cache = nfslog_mem_alloc[alloc_indx].mem_cache; lrp->exi = exi; if (exi->exi_export.ex_flags & EX_LOG) { LOG_BUFFER_HOLD(exi->exi_logbuffer); lrp->lb = exi->exi_logbuffer; } else { lrp->lb = NULL; } *cookie = (void *)lrp; LOGGING_DPRINT((3, "nfslog_record_alloc(log_buffer=%p mem=%p size=%lu)\n", exi->exi_logbuffer, lrp->log_record, lrp->size)); return (lrp->log_record); } /* * After the above nfslog_record_alloc() has been called and a record * encoded into the buffer that was returned, this function is called * to handle appropriate disposition of the newly created record. * The cookie value is the one that was returned from nfslog_record_alloc(). * Size is the actual size of the record that was encoded. This is * passed in because the size used for the alloc was just an approximation. * The sync parameter is used to tell us if we need to force this record * to disk and if not it will be queued for later writing. * * Note that if the size parameter has a value of 0, then the record is * not written to the log and the associated data structures are released. */ void nfslog_record_put(void *cookie, size_t size, bool_t sync, unsigned int which_buffers) { struct lr_alloc *lrp = (struct lr_alloc *)cookie; struct log_buffer *lbp = lrp->lb; /* * If the caller has nothing to write or if there is * an apparent error, rele the buffer and free. */ if (size == 0 || size > lrp->size) { nfslog_free_logrecords(lrp); return; } /* * Reset the size to what actually needs to be written * This is used later on when the iovec is built for * writing the records to the log file. */ lrp->size = size; /* append to all if public exi */ if (which_buffers == NFSLOG_ALL_BUFFERS) { (void) nfslog_record_append2all(lrp); nfslog_free_logrecords(lrp); return; } /* Insert the record on the list to be written */ mutex_enter(&lbp->lb_lock); if (lbp->lb_records == NULL) { lbp->lb_records = (caddr_t)lrp; lbp->lb_num_recs = 1; lbp->lb_size_queued = lrp->size; } else { insque(lrp, ((struct lr_alloc *)lbp->lb_records)->prev); lbp->lb_num_recs++; lbp->lb_size_queued += lrp->size; } /* * Determine if the queue for this log buffer should be flushed. * This is done by either the number of records queued, the total * size of all records queued or by the request of the caller * via the sync parameter. */ if (lbp->lb_size_queued >= nfslog_num_bytes_to_write || lbp->lb_num_recs > nfslog_num_records_to_write || sync == TRUE) { mutex_exit(&lbp->lb_lock); (void) nfslog_records_flush_to_disk(lbp); } else { mutex_exit(&lbp->lb_lock); } } /* * Examine the log_buffer struct to see if there are queue log records * that need to be written to disk. If some exist, pull them off of * the log buffer and write them to the log file. */ static int nfslog_records_flush_to_disk(struct log_buffer *lbp) { mutex_enter(&lbp->lb_lock); if (lbp->lb_records == NULL) { mutex_exit(&lbp->lb_lock); return (0); } return (nfslog_records_flush_to_disk_nolock(lbp)); } /* * Function requires that the caller holds lb_lock. * Function flushes any records in the log buffer to the disk. * Function drops the lb_lock on return. */ static int nfslog_records_flush_to_disk_nolock(struct log_buffer *lbp) { struct log_file *lfp = NULL; struct lr_alloc *lrp_writers; int num_recs; int error = 0; ASSERT(MUTEX_HELD(&lbp->lb_lock)); lfp = lbp->lb_logfile; LOG_FILE_LOCK_TO_WRITE(lfp); ASSERT(lbp->lb_records != NULL); lrp_writers = (struct lr_alloc *)lbp->lb_records; lbp->lb_records = NULL; num_recs = lbp->lb_num_recs; lbp->lb_num_recs = 0; lbp->lb_size_queued = 0; mutex_exit(&lbp->lb_lock); error = nfslog_write_logrecords(lfp, lrp_writers, num_recs); LOG_FILE_UNLOCK_FROM_WRITE(lfp); nfslog_free_logrecords(lrp_writers); return (error); } /* * Take care of writing the provided log record(s) to the log file. * We group the log records with an iovec and use VOP_WRITE to append * them to the end of the log file. */ static int nfslog_write_logrecords(struct log_file *lfp, struct lr_alloc *lrp_writers, int num_recs) { struct uio uio; struct iovec *iovp; int size_iovecs; vnode_t *vp; struct vattr va; struct lr_alloc *lrp; int i; ssize_t len; int ioflag = FAPPEND; int error = 0; ASSERT(MUTEX_HELD(&lfp->lf_lock)); vp = lfp->lf_vp; size_iovecs = sizeof (struct iovec) * num_recs; iovp = (struct iovec *)kmem_alloc(size_iovecs, KM_NOSLEEP); if (iovp == NULL) { error = ENOMEM; goto out; } /* Build the iovec based on the list of log records */ i = 0; len = 0; lrp = lrp_writers; do { iovp[i].iov_base = lrp->log_record; iovp[i].iov_len = lrp->size; len += lrp->size; lrp = lrp->next; i++; } while (lrp != lrp_writers); ASSERT(i == num_recs); uio.uio_iov = iovp; uio.uio_iovcnt = num_recs; uio.uio_loffset = 0; uio.uio_segflg = (short)UIO_SYSSPACE; uio.uio_resid = len; uio.uio_llimit = (rlim64_t)MAXOFFSET_T; uio.uio_fmode = FWRITE; uio.uio_extflg = UIO_COPY_DEFAULT; /* * Save the size. If the write fails, reset the size to avoid * corrupted log buffer files. */ va.va_mask = AT_SIZE; (void) VOP_RWLOCK(vp, V_WRITELOCK_TRUE, NULL); /* UIO_WRITE */ if ((error = VOP_GETATTR(vp, &va, 0, CRED())) == 0) { if ((len + va.va_size) < (MAXOFF32_T)) { error = VOP_WRITE(vp, &uio, ioflag, CRED(), NULL); if (uio.uio_resid) error = ENOSPC; if (error) (void) VOP_SETATTR(vp, &va, 0, CRED(), NULL); } else { if (!(lfp->lf_flags & L_PRINTED)) { cmn_err(CE_WARN, "NFS Logging: buffer file %s exceeds 2GB; " "stopped writing buffer \n", lfp->lf_path); } error = ENOSPC; } } VOP_RWUNLOCK(vp, V_WRITELOCK_TRUE, NULL); kmem_free(iovp, size_iovecs); out: if (error) { if (!(lfp->lf_flags & L_PRINTED)) { nfs_cmn_err(error, CE_WARN, "NFS Logging disabled for buffer %s - " "write error = %m\n", lfp->lf_path); lfp->lf_flags |= L_PRINTED; } } else if (lfp->lf_flags & (L_ERROR | L_PRINTED)) { lfp->lf_flags &= ~(L_ERROR | L_PRINTED); cmn_err(CE_WARN, "NFS Logging re-enabled for buffer %s\n", lfp->lf_path); } return (error); } static void nfslog_free_logrecords(struct lr_alloc *lrp_writers) { struct lr_alloc *lrp = lrp_writers; struct lr_alloc *lrp_free; do { lrp_free = lrp; lrp = lrp->next; /* * Check to see if we are supposed to free this structure * and relese the log_buffer ref count. * It may be the case that the caller does not want this * structure and its record contents freed just yet. */ if ((lrp_free->lr_flags & LR_ALLOC_NOFREE) == 0) { if (lrp_free->lb != NULL) log_buffer_rele(lrp_free->lb); if (lrp_free->alloc_cache) /* double check */ kmem_cache_free(lrp_free->alloc_cache, (void *)lrp_free); } else { /* * after being pulled from the list the * pointers need to be reinitialized. */ lrp_free->next = lrp_free; lrp_free->prev = lrp_free; } } while (lrp != lrp_writers); } /* * Rename lbp->lb_logfile to reflect the true name requested by 'share' */ static int nfslog_logbuffer_rename(struct log_buffer *lbp) { struct log_file *lf; int error; struct log_file *logfile; /* * Try our best to get the cache records into the log file * before the rename occurs. */ (void) nfslog_records_flush_to_disk(lbp); /* * Hold lb_lock before retrieving * lb_logfile. * Hold a reference to the * "lf" structure. this is * same as LOG_FILE_HOLD() */ mutex_enter(&(lbp)->lb_lock); lf = lbp->lb_logfile; mutex_enter(&(lf)->lf_lock); mutex_exit(&(lbp)->lb_lock); lf->lf_refcnt++; mutex_exit(&(lf)->lf_lock); LOGGING_DPRINT((10, "nfslog_logbuffer_rename: renaming %s to %s\n", lf->lf_path, lbp->lb_path)); /* * rename the current buffer to what the daemon expects */ if (error = nfslog_logfile_rename(lf->lf_path, lbp->lb_path)) goto out; /* * Create a new working buffer file and have all new data sent there. */ if (error = log_file_create(lbp->lb_path, &logfile)) { /* Attempt to rename to original */ (void) nfslog_logfile_rename(lbp->lb_path, lf->lf_path); goto out; } /* * Hold the lb_lock here, this will make * all the threads trying to access lb->logfile block * and get a new logfile structure instead of old one. */ mutex_enter(&(lbp)->lb_lock); lbp->lb_logfile = logfile; mutex_exit(&(lbp)->lb_lock); LOG_FILE_RELE(lf); /* release log_buffer's reference */ /* * Wait for log_file to be in a quiescent state before we * return to our caller to let it proceed with the reading of * this file. */ nfslog_logfile_wait(lf); out: /* * Release our reference on "lf" in two different cases. * 1. Error condition, release only the reference * that we held at the begining of this * routine on "lf" structure. * 2. Fall through condition, no errors but the old * logfile structure "lf" has been replaced with * the new "logfile" structure, so release the * reference that was part of the creation of * "lf" structure to free up the resources. */ LOG_FILE_RELE(lf); return (error); } /* * Renames the 'from' file to 'new'. */ static int nfslog_logfile_rename(char *from, char *new) { int error; if (error = vn_rename(from, new, UIO_SYSSPACE)) { cmn_err(CE_WARN, "nfslog_logfile_rename: couldn't rename %s to %s\n", from, new); } return (error); } /* * Wait for the log_file writers to finish before returning */ static void nfslog_logfile_wait(struct log_file *lf) { mutex_enter(&lf->lf_lock); while (lf->lf_writers > 0) { lf->lf_flags |= L_WAITING; (void) cv_wait_sig(&lf->lf_cv_waiters, &lf->lf_lock); } mutex_exit(&lf->lf_lock); } static int nfslog_record_append2all(struct lr_alloc *lrp) { struct log_buffer *lbp, *nlbp; int error, ret_error = 0; int lr_flags = lrp->lr_flags; rw_enter(&nfslog_buffer_list_lock, RW_READER); if ((lbp = nfslog_buffer_list) != NULL) LOG_BUFFER_HOLD(lbp); for (nlbp = NULL; lbp != NULL; lbp = nlbp) { if ((nlbp = lbp->lb_next) != NULL) { /* * Remember next element in the list */ LOG_BUFFER_HOLD(nlbp); } rw_exit(&nfslog_buffer_list_lock); /* * Insert the record on the buffer's list to be written * and then flush the records to the log file. * Make sure to set the no free flag so that the * record can be used for the next write */ lrp->lr_flags = LR_ALLOC_NOFREE; ASSERT(lbp != NULL); mutex_enter(&lbp->lb_lock); if (lbp->lb_records == NULL) { lbp->lb_records = (caddr_t)lrp; lbp->lb_num_recs = 1; lbp->lb_size_queued = lrp->size; } else { insque(lrp, ((struct lr_alloc *)lbp->lb_records)->prev); lbp->lb_num_recs++; lbp->lb_size_queued += lrp->size; } /* * Flush log records to disk. * Function is called with lb_lock held. * Function drops the lb_lock on return. */ error = nfslog_records_flush_to_disk_nolock(lbp); if (error) { ret_error = -1; nfs_cmn_err(error, CE_WARN, "rfsl_log_pubfh: could not append record to " "\"%s\" error = %m\n", lbp->lb_path); } log_buffer_rele(lbp); rw_enter(&nfslog_buffer_list_lock, RW_READER); } rw_exit(&nfslog_buffer_list_lock); lrp->lr_flags = lr_flags; return (ret_error); } #ifdef DEBUG static int logging_debug = 0; /* * 0) no debugging * 3) current test software * 10) random stuff */ void nfslog_dprint(const int level, const char *fmt, ...) { va_list args; if (logging_debug == level || (logging_debug > 10 && (logging_debug - 10) >= level)) { va_start(args, fmt); (void) vprintf(fmt, args); va_end(args); } } #endif /* DEBUG */ /* * NFS Log Flush system call * Caller must check privileges. */ /* ARGSUSED */ int nfsl_flush(struct nfsl_flush_args *args, model_t model) { struct flush_thread_params *tparams; struct nfsl_flush_args *nfsl_args; int error = 0; ulong_t buffer_len; STRUCT_HANDLE(nfsl_flush_args, uap); STRUCT_SET_HANDLE(uap, model, args); tparams = (struct flush_thread_params *) kmem_zalloc(sizeof (*tparams), KM_SLEEP); nfsl_args = &tparams->tp_args; nfsl_args->version = STRUCT_FGET(uap, version); if (nfsl_args->version != NFSL_FLUSH_ARGS_VERS) { cmn_err(CE_WARN, "nfsl_flush: exected version %d, got %d", NFSL_FLUSH_ARGS_VERS, nfsl_args->version); return (EIO); } nfsl_args->directive = STRUCT_FGET(uap, directive); if ((nfsl_args->directive & NFSL_ALL) == 0) { /* * Process a specific buffer */ nfsl_args->buff_len = STRUCT_FGET(uap, buff_len); nfsl_args->buff = (char *) kmem_alloc(nfsl_args->buff_len, KM_NOSLEEP); if (nfsl_args->buff == NULL) return (ENOMEM); error = copyinstr((const char *)STRUCT_FGETP(uap, buff), nfsl_args->buff, nfsl_args->buff_len, &buffer_len); if (error) return (EFAULT); if (nfsl_args->buff_len != buffer_len) return (EFAULT); } LOGGING_DPRINT((10, "nfsl_flush: Flushing %s buffer(s)\n", nfsl_args->directive & NFSL_ALL ? "all" : nfsl_args->buff)); if (nfsl_args->directive & NFSL_SYNC) { /* * Do the work synchronously */ nfslog_do_flush(tparams); error = tparams->tp_error; kmem_free(nfsl_args->buff, nfsl_args->buff_len); kmem_free(tparams, sizeof (*tparams)); } else { /* * Do the work asynchronously */ (void) thread_create(NULL, 0, nfslog_do_flush, tparams, 0, &p0, TS_RUN, minclsyspri); } return (error); } /* * This is where buffer flushing would occur, but there is no buffering * at this time. * Possibly rename the log buffer for processing. * Sets tparams->ta_error equal to the value of the error that occured, * 0 otherwise. * Returns ENOENT if the buffer is not found. */ static void nfslog_do_flush(struct flush_thread_params *tparams) { struct nfsl_flush_args *args; struct log_buffer *lbp; int error = ENOENT; int found = 0; char *buf_inprog; /* name of buff in progress */ int buf_inprog_len; /* * Sanity check on the arguments. */ if (!tparams) return; args = &tparams->tp_args; if (!args) return; rw_enter(&nfslog_buffer_list_lock, RW_READER); for (lbp = nfslog_buffer_list; lbp != NULL; lbp = lbp->lb_next) { if (args->directive & NFSL_ALL) { (void) nfslog_records_flush_to_disk(lbp); } else { if ((strcmp(lbp->lb_path, args->buff) == 0) && (args->directive & NFSL_RENAME)) { error = nfslog_logbuffer_rename(lbp); found++; break; } } } rw_exit(&nfslog_buffer_list_lock); if (!found && ((args->directive & NFSL_ALL) == 0) && (args->directive & NFSL_RENAME)) { /* * The specified buffer is not currently in use, * simply rename the file indicated. */ buf_inprog_len = strlen(args->buff) + strlen(LOG_INPROG_STRING) + 1; buf_inprog = (caddr_t)kmem_alloc(buf_inprog_len, KM_SLEEP); (void) sprintf(buf_inprog, "%s%s", args->buff, LOG_INPROG_STRING); error = nfslog_logfile_rename(buf_inprog, args->buff); kmem_free(buf_inprog, buf_inprog_len); } out: if ((args->directive & NFSL_SYNC) == 0) { /* * Work was performed asynchronously, the caller is * no longer waiting for us. * Free the thread arguments and exit. */ kmem_free(args->buff, args->buff_len); kmem_free(tparams, sizeof (*tparams)); thread_exit(); /* NOTREACHED */ } tparams->tp_error = error; } /* * Generate buffer_header. * 'loghdr' points the the buffer_header, and *reclen * contains the length of the buffer. */ static void create_buffer_header(caddr_t *loghdr, size_t *reclen, size_t *freesize) { timestruc_t now; nfslog_buffer_header lh; XDR xdrs; unsigned int final_size; /* pick some size that will hold the buffer_header */ *freesize = NFSLOG_SMALL_RECORD_SIZE; /* * Fill header */ lh.bh_length = 0; /* don't know yet how large it will be */ lh.bh_version = NFSLOG_BUF_VERSION; lh.bh_flags = 0; lh.bh_offset = 0; gethrestime(&now); TIMESPEC_TO_TIMESPEC32(&lh.bh_timestamp, &now); /* * Encode the header */ *loghdr = (caddr_t)kmem_alloc(*freesize, KM_SLEEP); xdrmem_create(&xdrs, *loghdr, *freesize, XDR_ENCODE); (void) xdr_nfslog_buffer_header(&xdrs, &lh); /* * Reset with final size of the encoded data */ final_size = xdr_getpos(&xdrs); xdr_setpos(&xdrs, 0); (void) xdr_u_int(&xdrs, &final_size); *reclen = (size_t)final_size; } /* * **************************************************************** * RPC dispatch table for logging * Indexed by program, version, proc * Based on NFS dispatch table. */ struct nfslog_proc_disp { bool_t (*xdrargs)(); bool_t (*xdrres)(); bool_t affects_transactions; /* Operation affects transaction */ /* processing */ }; struct nfslog_vers_disp { int nfslog_dis_nprocs; /* number of procs */ struct nfslog_proc_disp *nfslog_dis_proc_table; /* proc array */ }; struct nfslog_prog_disp { int nfslog_dis_prog; /* program number */ int nfslog_dis_versmin; /* Minimum version value */ int nfslog_dis_nvers; /* Number of version values */ struct nfslog_vers_disp *nfslog_dis_vers_table; /* versions array */ }; static int rfs_log_bad = 0; /* incremented on bad log attempts */ static int rfs_log_good = 0; /* incremented on successful log attempts */ /* * Define the actions taken per prog/vers/proc: * * In some cases, the nl types are the same as the nfs types and a simple * bcopy should suffice. Rather that define tens of identical procedures, * simply define these to bcopy. Similarly this takes care of different * procs that use same parameter struct. */ static struct nfslog_proc_disp nfslog_proc_v2[] = { /* * NFS VERSION 2 */ /* RFS_NULL = 0 */ {xdr_void, xdr_void, FALSE}, /* RFS_GETATTR = 1 */ {xdr_fhandle, xdr_nfslog_getattrres, FALSE}, /* RFS_SETATTR = 2 */ {xdr_nfslog_setattrargs, xdr_nfsstat, TRUE}, /* RFS_ROOT = 3 *** NO LONGER SUPPORTED *** */ {xdr_void, xdr_void, FALSE}, /* RFS_LOOKUP = 4 */ {xdr_nfslog_diropargs, xdr_nfslog_diropres, TRUE}, /* RFS_READLINK = 5 */ {xdr_fhandle, xdr_nfslog_rdlnres, FALSE}, /* RFS_READ = 6 */ {xdr_nfslog_nfsreadargs, xdr_nfslog_rdresult, TRUE}, /* RFS_WRITECACHE = 7 *** NO LONGER SUPPORTED *** */ {xdr_void, xdr_void, FALSE}, /* RFS_WRITE = 8 */ {xdr_nfslog_writeargs, xdr_nfslog_writeresult, TRUE}, /* RFS_CREATE = 9 */ {xdr_nfslog_createargs, xdr_nfslog_diropres, TRUE}, /* RFS_REMOVE = 10 */ {xdr_nfslog_diropargs, xdr_nfsstat, TRUE}, /* RFS_RENAME = 11 */ {xdr_nfslog_rnmargs, xdr_nfsstat, TRUE}, /* RFS_LINK = 12 */ {xdr_nfslog_linkargs, xdr_nfsstat, TRUE}, /* RFS_SYMLINK = 13 */ {xdr_nfslog_symlinkargs, xdr_nfsstat, TRUE}, /* RFS_MKDIR = 14 */ {xdr_nfslog_createargs, xdr_nfslog_diropres, TRUE}, /* RFS_RMDIR = 15 */ {xdr_nfslog_diropargs, xdr_nfsstat, TRUE}, /* RFS_READDIR = 16 */ {xdr_nfslog_rddirargs, xdr_nfslog_rddirres, TRUE}, /* RFS_STATFS = 17 */ {xdr_fhandle, xdr_nfslog_statfs, FALSE}, }; /* * NFS VERSION 3 */ static struct nfslog_proc_disp nfslog_proc_v3[] = { /* NFSPROC3_NULL = 0 */ {xdr_void, xdr_void, FALSE}, /* NFSPROC3_GETATTR = 1 */ {xdr_nfslog_nfs_fh3, xdr_nfslog_GETATTR3res, FALSE}, /* NFSPROC3_SETATTR = 2 */ {xdr_nfslog_SETATTR3args, xdr_nfslog_SETATTR3res, TRUE}, /* NFSPROC3_LOOKUP = 3 */ {xdr_nfslog_diropargs3, xdr_nfslog_LOOKUP3res, TRUE}, /* NFSPROC3_ACCESS = 4 */ {xdr_nfslog_ACCESS3args, xdr_nfslog_ACCESS3res, FALSE}, /* NFSPROC3_READLINK = 5 */ {xdr_nfslog_nfs_fh3, xdr_nfslog_READLINK3res, FALSE}, /* NFSPROC3_READ = 6 */ {xdr_nfslog_READ3args, xdr_nfslog_READ3res, TRUE}, /* NFSPROC3_WRITE = 7 */ {xdr_nfslog_WRITE3args, xdr_nfslog_WRITE3res, TRUE}, /* NFSPROC3_CREATE = 8 */ {xdr_nfslog_CREATE3args, xdr_nfslog_CREATE3res, TRUE}, /* NFSPROC3_MKDIR = 9 */ {xdr_nfslog_MKDIR3args, xdr_nfslog_MKDIR3res, TRUE}, /* NFSPROC3_SYMLINK = 10 */ {xdr_nfslog_SYMLINK3args, xdr_nfslog_SYMLINK3res, TRUE}, /* NFSPROC3_MKNOD = 11 */ {xdr_nfslog_MKNOD3args, xdr_nfslog_MKNOD3res, TRUE}, /* NFSPROC3_REMOVE = 12 */ {xdr_nfslog_REMOVE3args, xdr_nfslog_REMOVE3res, TRUE}, /* NFSPROC3_RMDIR = 13 */ {xdr_nfslog_RMDIR3args, xdr_nfslog_RMDIR3res, TRUE}, /* NFSPROC3_RENAME = 14 */ {xdr_nfslog_RENAME3args, xdr_nfslog_RENAME3res, TRUE}, /* NFSPROC3_LINK = 15 */ {xdr_nfslog_LINK3args, xdr_nfslog_LINK3res, TRUE}, /* NFSPROC3_READDIR = 16 */ {xdr_nfslog_READDIR3args, xdr_nfslog_READDIR3res, TRUE}, /* NFSPROC3_READDIRPLUS = 17 */ {xdr_nfslog_READDIRPLUS3args, xdr_nfslog_READDIRPLUS3res, TRUE}, /* NFSPROC3_FSSTAT = 18 */ {xdr_nfslog_FSSTAT3args, xdr_nfslog_FSSTAT3res, FALSE}, /* NFSPROC3_FSINFO = 19 */ {xdr_nfslog_FSINFO3args, xdr_nfslog_FSINFO3res, FALSE}, /* NFSPROC3_PATHCONF = 20 */ {xdr_nfslog_PATHCONF3args, xdr_nfslog_PATHCONF3res, FALSE}, /* NFSPROC3_COMMIT = 21 */ {xdr_nfslog_COMMIT3args, xdr_nfslog_COMMIT3res, FALSE}, }; static struct nfslog_proc_disp nfslog_proc_v1[] = { /* * NFSLOG VERSION 1 */ /* NFSLOG_NULL = 0 */ {xdr_void, xdr_void, TRUE}, /* NFSLOG_SHARE = 1 */ {xdr_nfslog_sharefsargs, xdr_nfslog_sharefsres, TRUE}, /* NFSLOG_UNSHARE = 2 */ {xdr_nfslog_sharefsargs, xdr_nfslog_sharefsres, TRUE}, /* NFSLOG_LOOKUP = 3 */ {xdr_nfslog_diropargs3, xdr_nfslog_LOOKUP3res, TRUE}, /* NFSLOG_GETFH = 4 */ {xdr_nfslog_getfhargs, xdr_nfsstat, TRUE}, }; static struct nfslog_vers_disp nfslog_vers_disptable[] = { {sizeof (nfslog_proc_v2) / sizeof (nfslog_proc_v2[0]), nfslog_proc_v2}, {sizeof (nfslog_proc_v3) / sizeof (nfslog_proc_v3[0]), nfslog_proc_v3}, }; static struct nfslog_vers_disp nfslog_nfslog_vers_disptable[] = { {sizeof (nfslog_proc_v1) / sizeof (nfslog_proc_v1[0]), nfslog_proc_v1}, }; static struct nfslog_prog_disp nfslog_dispatch_table[] = { {NFS_PROGRAM, NFS_VERSMIN, (sizeof (nfslog_vers_disptable) / sizeof (nfslog_vers_disptable[0])), nfslog_vers_disptable}, {NFSLOG_PROGRAM, NFSLOG_VERSMIN, (sizeof (nfslog_nfslog_vers_disptable) / sizeof (nfslog_nfslog_vers_disptable[0])), nfslog_nfslog_vers_disptable}, }; static int nfslog_dispatch_table_arglen = sizeof (nfslog_dispatch_table) / sizeof (nfslog_dispatch_table[0]); /* * This function will determine the appropriate export info struct to use * and allocate a record id to be used in the written log buffer. * Usually this is a straightforward operation but the existence of the * multicomponent lookup and its semantics of crossing file system * boundaries add to the complexity. See the comments below... */ struct exportinfo * nfslog_get_exi( struct exportinfo *exi, struct svc_req *req, caddr_t res, unsigned int *nfslog_rec_id) { struct log_buffer *lb; struct exportinfo *exi_ret = NULL; fhandle_t *fh; nfs_fh3 *fh3; if (exi == NULL) return (NULL); /* * If the exi is marked for logging, allocate a record id and return */ if (exi->exi_export.ex_flags & EX_LOG) { lb = exi->exi_logbuffer; /* obtain the unique record id for the caller */ *nfslog_rec_id = atomic_add_32_nv(&lb->lb_rec_id, (int32_t)1); /* * The caller will expect to be able to exi_rele() it, * so exi->exi_count must be incremented before it can * be returned, to make it uniform with exi_ret->exi_count */ mutex_enter(&exi->exi_lock); exi->exi_count++; mutex_exit(&exi->exi_lock); return (exi); } if (exi != exi_public) return (NULL); /* * Here we have an exi that is not marked for logging. * It is possible that this request is a multicomponent lookup * that was done from the public file handle (not logged) and * the resulting file handle being returned to the client exists * in a file system that is being logged. If this is the case * we need to log this multicomponent lookup to the appropriate * log buffer. This will allow for the appropriate path name * mapping to occur at user level. */ if (req->rq_prog == NFS_PROGRAM) { switch (req->rq_vers) { case NFS_V3: if ((req->rq_proc == NFSPROC3_LOOKUP) && (((LOOKUP3res *)res)->status == NFS3_OK)) { fh3 = &((LOOKUP3res *)res)->res_u.ok.object; exi_ret = checkexport(&fh3->fh3_fsid, FH3TOXFIDP(fh3)); } break; case NFS_VERSION: if ((req->rq_proc == RFS_LOOKUP) && (((struct nfsdiropres *) res)->dr_status == NFS_OK)) { fh = &((struct nfsdiropres *)res)->dr_u.dr_drok_u.drok_fhandle; exi_ret = checkexport(&fh->fh_fsid, (fid_t *)&fh->fh_xlen); } break; default: break; } } if (exi_ret != NULL && exi_ret->exi_export.ex_flags & EX_LOG) { lb = exi_ret->exi_logbuffer; /* obtain the unique record id for the caller */ *nfslog_rec_id = atomic_add_32_nv(&lb->lb_rec_id, (int32_t)1); return (exi_ret); } return (NULL); } #ifdef DEBUG static long long rfslog_records_ignored = 0; #endif /* * nfslog_write_record - Fill in the record buffer for writing out. * If logrecp is null, log it, otherwise, malloc the record and return it. * * It is the responsibility of the caller to check whether this exportinfo * has logging enabled. * Note that nfslog_share_public_record() only needs to check for the * existence of at least one logbuffer to which the public filehandle record * needs to be logged. */ void nfslog_write_record(struct exportinfo *exi, struct svc_req *req, caddr_t args, caddr_t res, cred_t *cr, struct netbuf *pnb, unsigned int record_id, unsigned int which_buffers) { struct nfslog_prog_disp *progtable; /* prog struct */ struct nfslog_vers_disp *verstable; /* version struct */ struct nfslog_proc_disp *disp = NULL; /* proc struct */ int i, vers; void *log_cookie; /* for logrecord if */ caddr_t buffer; XDR xdrs; unsigned int final_size; int encode_ok; int alloc_indx; ASSERT(exi != NULL); ASSERT(req != NULL); ASSERT(args != NULL); ASSERT(res != NULL); ASSERT(cr != NULL); /* * Find program element * Search the list since program can not be used as index */ for (i = 0; (i < nfslog_dispatch_table_arglen); i++) { if (req->rq_prog == nfslog_dispatch_table[i].nfslog_dis_prog) break; } if (i >= nfslog_dispatch_table_arglen) { /* program not logged */ /* not an error */ return; } /* * Extract the dispatch functions based on program/version */ progtable = &nfslog_dispatch_table[i]; vers = req->rq_vers - progtable->nfslog_dis_versmin; verstable = &progtable->nfslog_dis_vers_table[vers]; disp = &verstable->nfslog_dis_proc_table[req->rq_proc]; if (!(exi->exi_export.ex_flags & EX_LOG_ALLOPS) && !disp->affects_transactions) { /* * Only interested in logging operations affecting * transaction generation. This is not one of them. */ #ifdef DEBUG rfslog_records_ignored++; #endif return; } switch (req->rq_prog) { case NFS_PROGRAM: switch (req->rq_vers) { case NFS_V3: switch (req->rq_proc) { case NFSPROC3_READDIRPLUS: alloc_indx = MEDIUM_INDX; break; default: alloc_indx = SMALL_INDX; break; } break; default: alloc_indx = SMALL_INDX; break; } break; case NFSLOG_PROGRAM: alloc_indx = MEDIUM_INDX; break; default: alloc_indx = SMALL_INDX; break; } do { encode_ok = FALSE; /* Pick the size to alloc; end of the road - return */ if (nfslog_mem_alloc[alloc_indx].size == (-1)) { cmn_err(CE_WARN, "NFSLOG: unable to encode record - prog=%d " "proc = %d", req->rq_prog, req->rq_proc); return; } buffer = nfslog_record_alloc(exi, alloc_indx, &log_cookie, 0); if (buffer == NULL) { /* Error processing - no space alloced */ rfs_log_bad++; cmn_err(CE_WARN, "NFSLOG: can't get record"); return; } xdrmem_create(&xdrs, buffer, nfslog_mem_alloc[alloc_indx].size, XDR_ENCODE); /* * Encode the header, args and results of the record */ if (xdr_nfslog_request_record(&xdrs, exi, req, cr, pnb, nfslog_mem_alloc[alloc_indx].size, record_id) && (*disp->xdrargs)(&xdrs, args) && (*disp->xdrres)(&xdrs, res)) { encode_ok = TRUE; rfs_log_good++; /* * Get the final size of the encoded * data and insert that length at the * beginning. */ final_size = xdr_getpos(&xdrs); xdr_setpos(&xdrs, 0); (void) xdr_u_int(&xdrs, &final_size); } else { /* Oops, the encode failed so we need to free memory */ nfslog_record_put(log_cookie, 0, FALSE, which_buffers); alloc_indx++; } } while (encode_ok == FALSE); /* * Take the final log record and put it in the log file. * This may be queued to the file internally and written * later unless the last parameter is TRUE. * If the record_id is 0 then this is most likely a share/unshare * request and it should be written synchronously to the log file. */ nfslog_record_put(log_cookie, final_size, (record_id == 0), which_buffers); } static char * get_publicfh_path(int *alloc_length) { extern struct exportinfo *exi_public; char *pubpath; rw_enter(&exported_lock, RW_READER); *alloc_length = exi_public->exi_export.ex_pathlen + 1; pubpath = kmem_alloc(*alloc_length, KM_SLEEP); (void) strcpy(pubpath, exi_public->exi_export.ex_path); rw_exit(&exported_lock); return (pubpath); } static void log_public_record(struct exportinfo *exi, cred_t *cr) { struct svc_req req; struct netbuf nb = {0, 0, NULL}; int free_length = 0; diropargs3 args; LOOKUP3res res; bzero(&req, sizeof (req)); req.rq_prog = NFSLOG_PROGRAM; req.rq_vers = NFSLOG_VERSION; req.rq_proc = NFSLOG_LOOKUP; req.rq_cred.oa_flavor = AUTH_NONE; bzero(&args, sizeof (diropargs3)); bzero(&res, sizeof (LOOKUP3res)); args.dir.fh3_length = 0; if ((args.name = get_publicfh_path(&free_length)) == NULL) return; args.dirp = &args.dir; res.status = NFS3_OK; res.res_u.ok.object.fh3_length = 0; /* * Calling this function with the exi_public * will have the effect of appending the record * to each of the open log buffers */ nfslog_write_record(exi, &req, (caddr_t)&args, (caddr_t)&res, cr, &nb, 0, NFSLOG_ALL_BUFFERS); kmem_free(args.name, free_length); } /* * nfslog_share_record - logs a share request. * This is not an NFS request, but we pretend here... */ void nfslog_share_record(struct exportinfo *exi, cred_t *cr) { struct svc_req req; int res = 0; struct netbuf nb = {0, 0, NULL}; ASSERT(exi != NULL); if (nfslog_buffer_list == NULL) return; if (exi->exi_export.ex_flags & EX_LOG) { bzero(&req, sizeof (req)); req.rq_prog = NFSLOG_PROGRAM; req.rq_vers = NFSLOG_VERSION; req.rq_proc = NFSLOG_SHARE; req.rq_cred.oa_flavor = AUTH_NONE; nfslog_write_record(exi, &req, (caddr_t)exi, (caddr_t)&res, cr, &nb, 0, NFSLOG_ONE_BUFFER); } log_public_record(exi, cr); } /* * nfslog_unshare_record - logs an unshare request. * This is not an NFS request, but we pretend here... */ void nfslog_unshare_record(struct exportinfo *exi, cred_t *cr) { struct svc_req req; int res = 0; struct netbuf nb = {0, 0, NULL}; ASSERT(exi != NULL); ASSERT(exi->exi_export.ex_flags & EX_LOG); bzero(&req, sizeof (req)); req.rq_prog = NFSLOG_PROGRAM; req.rq_vers = NFSLOG_VERSION; req.rq_proc = NFSLOG_UNSHARE; req.rq_cred.oa_flavor = AUTH_NONE; nfslog_write_record(exi, &req, (caddr_t)exi, (caddr_t)&res, cr, &nb, 0, NFSLOG_ONE_BUFFER); } void nfslog_getfh(struct exportinfo *exi, fhandle *fh, char *fname, enum uio_seg seg, cred_t *cr) { struct svc_req req; int res = 0; struct netbuf nb = {0, 0, NULL}; int error = 0; char *namebuf; size_t len; nfslog_getfhargs gfh; ASSERT(exi != NULL); ASSERT(exi->exi_export.ex_flags & EX_LOG); bzero(&req, sizeof (req)); req.rq_prog = NFSLOG_PROGRAM; req.rq_vers = NFSLOG_VERSION; req.rq_proc = NFSLOG_GETFH; req.rq_cred.oa_flavor = AUTH_NONE; namebuf = kmem_alloc(MAXPATHLEN + 4, KM_SLEEP); if (seg == UIO_USERSPACE) { error = copyinstr(fname, namebuf, MAXPATHLEN, &len); } else { error = copystr(fname, namebuf, MAXPATHLEN, &len); } if (!error) { gfh.gfh_fh_buf = *fh; gfh.gfh_path = namebuf; nfslog_write_record(exi, &req, (caddr_t)&gfh, (caddr_t)&res, cr, &nb, 0, NFSLOG_ONE_BUFFER); } kmem_free(namebuf, MAXPATHLEN + 4); }