diff options
Diffstat (limited to 'src/H5FDcore.c')
| -rw-r--r-- | src/H5FDcore.c | 51 |
1 files changed, 39 insertions, 12 deletions
diff --git a/src/H5FDcore.c b/src/H5FDcore.c index e4a3207..40d838c 100644 --- a/src/H5FDcore.c +++ b/src/H5FDcore.c @@ -36,6 +36,9 @@ /* The driver identification number, initialized at runtime */ static hid_t H5FD_CORE_g = 0; +/* Whether to ignore file locks when disabled (env var value) */ +static htri_t ignore_disabled_file_locks_s = FAIL; + /* The skip list node type. Represents a region in the file. */ typedef struct H5FD_core_region_t { haddr_t start; /* Start address of the region */ @@ -55,6 +58,7 @@ typedef struct H5FD_core_t { size_t increment; /* multiples for mem allocation */ hbool_t backing_store; /* write to file name on flush */ size_t bstore_page_size; /* backing store page size */ + hbool_t ignore_disabled_file_locks; int fd; /* backing store file descriptor */ /* Information for determining uniqueness of a file with a backing store */ #ifndef H5_HAVE_WIN32_API @@ -407,9 +411,19 @@ done: static herr_t H5FD__init_package(void) { + char *lock_env_var = NULL; /* Environment variable pointer */ herr_t ret_value = SUCCEED; - FUNC_ENTER_NOAPI_NOINIT + FUNC_ENTER_STATIC + + /* Check the use disabled file locks environment variable */ + lock_env_var = HDgetenv("HDF5_USE_FILE_LOCKING"); + if(lock_env_var && !HDstrcmp(lock_env_var, "BEST_EFFORT")) + ignore_disabled_file_locks_s = TRUE; /* Override: Ignore disabled locks */ + else if(lock_env_var && (!HDstrcmp(lock_env_var, "TRUE") || !HDstrcmp(lock_env_var, "1"))) + ignore_disabled_file_locks_s = FALSE; /* Override: Don't ignore disabled locks */ + else + ignore_disabled_file_locks_s = FAIL; /* Environment variable not set, or not set correctly */ if(H5FD_core_init() < 0) HGOTO_ERROR(H5E_VFL, H5E_CANTINIT, FAIL, "unable to initialize core VFD") @@ -691,6 +705,16 @@ H5FD__core_open(const char *name, unsigned flags, hid_t fapl_id, haddr_t maxaddr /* Save file image callbacks */ file->fi_callbacks = file_image_info.callbacks; + /* Check the file locking flags in the fapl */ + if(ignore_disabled_file_locks_s != FAIL) + /* The environment variable was set, so use that preferentially */ + file->ignore_disabled_file_locks = ignore_disabled_file_locks_s; + else { + /* Use the value in the property list */ + if(H5P_get(plist, H5F_ACS_IGNORE_DISABLED_FILE_LOCKS_NAME, &file->ignore_disabled_file_locks) < 0) + HGOTO_ERROR(H5E_VFL, H5E_CANTGET, NULL, "can't get ignore disabled file locks property") + } + if(fd >= 0) { /* Retrieve information for determining uniqueness of file */ #ifdef H5_HAVE_WIN32_API @@ -1509,18 +1533,20 @@ H5FD_core_lock(H5FD_t *_file, hbool_t rw) * descriptor, this is a no-op. */ if(file->fd >= 0) { - /* Set exclusive or shared lock based on rw status */ lock_flags = rw ? LOCK_EX : LOCK_SH; /* Place a non-blocking lock on the file */ if(HDflock(file->fd, lock_flags | LOCK_NB) < 0) { - if(ENOSYS == errno) - HSYS_GOTO_ERROR(H5E_FILE, H5E_BADFILE, FAIL, "file locking disabled on this file system (use HDF5_USE_FILE_LOCKING environment variable to override)") + if(file->ignore_disabled_file_locks && ENOSYS == errno) { + /* When errno is set to ENOSYS, the file system does not support + * locking, so ignore it. + */ + errno = 0; + } else HSYS_GOTO_ERROR(H5E_FILE, H5E_BADFILE, FAIL, "unable to lock file") } /* end if */ - } /* end if */ done: @@ -1549,16 +1575,17 @@ H5FD_core_unlock(H5FD_t *_file) HDassert(file); - if(file->fd >= 0) { - + if(file->fd >= 0) if(HDflock(file->fd, LOCK_UN) < 0) { - if(ENOSYS == errno) - HSYS_GOTO_ERROR(H5E_FILE, H5E_BADFILE, FAIL, "file locking disabled on this file system (use HDF5_USE_FILE_LOCKING environment variable to override)") + if(file->ignore_disabled_file_locks && ENOSYS == errno) { + /* When errno is set to ENOSYS, the file system does not support + * locking, so ignore it. + */ + errno = 0; + } else HSYS_GOTO_ERROR(H5E_FILE, H5E_BADFILE, FAIL, "unable to unlock file") - } /* end if */ - - } /* end if */ + } done: FUNC_LEAVE_NOAPI(ret_value) |