| /* |
| * vim:expandtab:shiftwidth=8:tabstop=8: |
| * |
| * Copyright CEA/DAM/DIF (2008) |
| * contributeur : Philippe DENIEL philippe.deniel@cea.fr |
| * Thomas LEIBOVICI thomas.leibovici@cea.fr |
| * |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 3 of the License, or (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with this library; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| * |
| * --------------------------------------- |
| */ |
| |
| /** |
| * \file cache_inode_rdwr.c |
| * \date $Date: 2005/11/28 17:02:27 $ |
| * \version $Revision: 1.20 $ |
| * \brief Removes an entry of any type. |
| * |
| * cache_inode_rdwr.c : performs an IO on a REGULAR_FILE. |
| * |
| * |
| */ |
| #ifdef HAVE_CONFIG_H |
| #include "config.h" |
| #endif |
| |
| #ifdef _SOLARIS |
| #include "solaris_port.h" |
| #endif /* _SOLARIS */ |
| |
| #include "fsal.h" |
| |
| #include "log.h" |
| #include "HashData.h" |
| #include "HashTable.h" |
| #include "cache_inode.h" |
| #include "cache_inode_lru.h" |
| #include "nfs_core.h" |
| |
| #include <unistd.h> |
| #include <sys/types.h> |
| #include <sys/stat.h> |
| #include <sys/param.h> |
| #include <time.h> |
| #include <pthread.h> |
| #include <assert.h> |
| |
| /** |
| * @brief Reads/Writes through the cache layer |
| * |
| * This function performs I/O, either using the Ganesha in-memory or |
| * disk cache or through the FSAL directly. The caller MUST NOT hold |
| * either the content or attribute locks when calling this function. |
| * |
| * @param[in] entry File to be read or written |
| * @param[in] io_direction Whether this is a read or a write |
| * @param[in] offset Absolute file position for I/O |
| * @param[in] io_size Amount of data to be read or written |
| * @param[out] bytes_moved The length of data successfuly read or written |
| * @param[in,out] buffer Where in memory to read or write data |
| * @param[out] eof Whether a READ encountered the end of file. May |
| * be NULL for writes. |
| * @param[in] context FSAL credentials |
| * @param[in] stable The stability of the write to perform |
| * @param[out] status Status of operation |
| * |
| * @return CACHE_INODE_SUCCESS or various errors |
| */ |
| |
| cache_inode_status_t |
| cache_inode_rdwr(cache_entry_t *entry, |
| cache_inode_io_direction_t io_direction, |
| uint64_t offset, |
| size_t io_size, |
| size_t *bytes_moved, |
| void *buffer, |
| bool *eof, |
| struct req_op_context *req_ctx, |
| cache_inode_stability_t stable, |
| cache_inode_status_t *status) |
| { |
| /* Error return from FSAL calls */ |
| fsal_status_t fsal_status = {0, 0}; |
| struct fsal_obj_handle *obj_hdl = entry->obj_handle; |
| /* Required open mode to successfully read or write */ |
| fsal_openflags_t openflags = FSAL_O_CLOSED; |
| fsal_openflags_t loflags; |
| /* True if we have taken the content lock on 'entry' */ |
| bool content_locked = false; |
| /* True if we have taken the attribute lock on 'entry' */ |
| bool attributes_locked = false; |
| |
| /* Set flags for a read or write, as appropriate */ |
| if (io_direction == CACHE_INODE_READ) { |
| openflags = FSAL_O_READ; |
| } else { |
| openflags = FSAL_O_WRITE; |
| if (stable == CACHE_INODE_SAFE_WRITE_TO_FS) |
| openflags |= FSAL_O_SYNC; |
| } |
| |
| /* IO is done only on REGULAR_FILEs */ |
| if (entry->type != REGULAR_FILE) { |
| *status = entry->type == DIRECTORY |
| ? CACHE_INODE_IS_A_DIRECTORY : CACHE_INODE_BAD_TYPE; |
| goto out; |
| } |
| |
| if (stable == CACHE_INODE_UNSAFE_WRITE_TO_GANESHA_BUFFER) { |
| /* Write to memory */ |
| pthread_rwlock_wrlock(&entry->content_lock); |
| content_locked = true; |
| |
| /* Is the unstable_data buffer allocated? */ |
| if ((entry->object.file.unstable_data.buffer == NULL) && |
| (io_size <= CACHE_INODE_UNSTABLE_BUFFERSIZE)) { |
| if ((entry->object.file.unstable_data.buffer = |
| gsh_malloc(CACHE_INODE_UNSTABLE_BUFFERSIZE)) == NULL) { |
| *status = CACHE_INODE_MALLOC_ERROR; |
| goto out; |
| } |
| |
| entry->object.file.unstable_data.offset = offset; |
| entry->object.file.unstable_data.length = io_size; |
| |
| memcpy(entry->object.file.unstable_data.buffer, |
| buffer, io_size); |
| |
| pthread_rwlock_wrlock(&entry->attr_lock); |
| attributes_locked = true; |
| cache_inode_set_time_current(&obj_hdl->attributes.mtime); |
| *bytes_moved = io_size; |
| } else { |
| if ((entry->object.file.unstable_data.offset < offset) && |
| (io_size + offset < CACHE_INODE_UNSTABLE_BUFFERSIZE)) { |
| entry->object.file.unstable_data.length = |
| io_size + offset; |
| memcpy(entry->object.file.unstable_data.buffer + |
| offset, buffer, io_size); |
| |
| pthread_rwlock_wrlock(&entry->attr_lock); |
| attributes_locked = true; |
| cache_inode_set_time_current(&obj_hdl->attributes.mtime); |
| *bytes_moved = io_size; |
| } else { |
| /* Go back to stable writes */ |
| stable = CACHE_INODE_SAFE_WRITE_TO_FS; |
| } |
| } |
| if (content_locked) { |
| pthread_rwlock_unlock(&entry->content_lock); |
| content_locked = false; |
| } |
| if (attributes_locked) { |
| pthread_rwlock_unlock(&entry->attr_lock); |
| attributes_locked = false; |
| } |
| } |
| |
| if (stable == CACHE_INODE_SAFE_WRITE_TO_FS || |
| stable == CACHE_INODE_UNSAFE_WRITE_TO_FS_BUFFER) { |
| /* Write through the FSAL. We need a write lock only |
| if we need to open or close a file descriptor. */ |
| pthread_rwlock_rdlock(&entry->content_lock); |
| content_locked = true; |
| loflags = obj_hdl->ops->status(obj_hdl); |
| if (( !is_open(entry)) || |
| (loflags && loflags != FSAL_O_RDWR && loflags != openflags)) { |
| pthread_rwlock_unlock(&entry->content_lock); |
| pthread_rwlock_wrlock(&entry->content_lock); |
| loflags = obj_hdl->ops->status(obj_hdl); |
| if (( !is_open(entry)) || |
| (loflags && loflags != FSAL_O_RDWR && |
| loflags != openflags)) { |
| if (cache_inode_open(entry, |
| openflags, |
| req_ctx, |
| (CACHE_INODE_FLAG_CONTENT_HAVE | |
| CACHE_INODE_FLAG_CONTENT_HOLD), |
| status) != CACHE_INODE_SUCCESS) { |
| goto out; |
| } |
| } |
| } |
| |
| /* Call FSAL_read or FSAL_write */ |
| if (io_direction == CACHE_INODE_READ) { |
| fsal_status = obj_hdl->ops->read(obj_hdl, req_ctx, |
| offset, |
| io_size, |
| buffer, |
| bytes_moved, |
| eof); |
| } else { |
| fsal_status = obj_hdl->ops->write(obj_hdl, req_ctx, |
| offset, |
| io_size, |
| buffer, |
| bytes_moved); |
| |
| /* Alright, the unstable write is complete. Now if it was |
| supposed to be a stable write we can sync to the hard |
| drive. */ |
| |
| if (stable == CACHE_INODE_SAFE_WRITE_TO_FS && |
| !(obj_hdl->ops->status(obj_hdl) & FSAL_O_SYNC)) { |
| fsal_status = obj_hdl->ops->commit(obj_hdl, |
| offset, |
| io_size); |
| } |
| } |
| |
| LogFullDebug(COMPONENT_FSAL, |
| "cache_inode_rdwr: FSAL IO operation returned " |
| "%d, asked_size=%zu, effective_size=%zu", |
| fsal_status.major, io_size, *bytes_moved); |
| |
| if (FSAL_IS_ERROR(fsal_status)) { |
| if (fsal_status.major == ERR_FSAL_DELAY) { |
| LogEvent(COMPONENT_CACHE_INODE, |
| "cache_inode_rdwr: FSAL_write " |
| " returned EBUSY"); |
| } else { |
| LogDebug(COMPONENT_CACHE_INODE, |
| "cache_inode_rdwr: fsal_status.major = %d", |
| fsal_status.major); |
| } |
| |
| *bytes_moved = 0; |
| *status = cache_inode_error_convert(fsal_status); |
| |
| if (fsal_status.major == ERR_FSAL_STALE) { |
| cache_inode_kill_entry(entry); |
| goto out; |
| } |
| |
| if ((fsal_status.major != ERR_FSAL_NOT_OPENED) |
| && (obj_hdl->ops->status(obj_hdl) != FSAL_O_CLOSED)) { |
| cache_inode_status_t cstatus; |
| |
| LogFullDebug(COMPONENT_CACHE_INODE, |
| "cache_inode_rdwr: CLOSING entry %p", |
| entry); |
| pthread_rwlock_unlock(&entry->content_lock); |
| pthread_rwlock_wrlock(&entry->content_lock); |
| |
| cache_inode_close(entry, |
| (CACHE_INODE_FLAG_REALLYCLOSE | |
| CACHE_INODE_FLAG_CONTENT_HAVE | |
| CACHE_INODE_FLAG_CONTENT_HOLD), |
| &cstatus); |
| |
| if (cstatus != CACHE_INODE_SUCCESS) { |
| LogCrit(COMPONENT_CACHE_INODE_LRU, |
| "Error closing file in cache_inode_rdwr: %d.", |
| cstatus); |
| } |
| } |
| |
| goto out; |
| } |
| |
| LogFullDebug(COMPONENT_CACHE_INODE, |
| "cache_inode_rdwr: inode/direct: io_size=%zu, " |
| "bytes_moved=%zu, offset=%"PRIu64, |
| io_size, *bytes_moved, offset); |
| |
| if (is_open(entry)) { |
| if (cache_inode_close(entry, |
| CACHE_INODE_FLAG_CONTENT_HAVE | |
| CACHE_INODE_FLAG_CONTENT_HOLD, |
| status) != CACHE_INODE_SUCCESS) { |
| LogEvent(COMPONENT_CACHE_INODE, |
| "cache_inode_rdwr: cache_inode_close = %d", |
| *status); |
| goto out; |
| } |
| } |
| |
| if (content_locked) { |
| pthread_rwlock_unlock(&entry->content_lock); |
| content_locked = false; |
| } |
| } |
| |
| pthread_rwlock_wrlock(&entry->attr_lock); |
| attributes_locked = true; |
| if (io_direction == CACHE_INODE_WRITE) { |
| if ((*status = cache_inode_refresh_attrs(entry, req_ctx)) |
| != CACHE_INODE_SUCCESS) { |
| goto out; |
| } |
| } else { |
| cache_inode_set_time_current(&obj_hdl->attributes.atime); |
| } |
| pthread_rwlock_unlock(&entry->attr_lock); |
| attributes_locked = false; |
| |
| *status = CACHE_INODE_SUCCESS; |
| |
| out: |
| |
| if (content_locked) { |
| pthread_rwlock_unlock(&entry->content_lock); |
| content_locked = false; |
| } |
| |
| if (attributes_locked) { |
| pthread_rwlock_unlock(&entry->attr_lock); |
| attributes_locked = false; |
| } |
| |
| return *status; |
| } /* cache_inode_rdwr */ |
