/* * Copyright © 1999-2001 NCSA * All rights reserved. * * Programmer: Saurabh Bagchi (bagchi@uiuc.edu) * Thursday, August 12 -Tuesday, August 17, 1999 * * Purpose: This is the GASS I/O driver. * */ #include "H5private.h" /*library functions */ #include "H5Eprivate.h" /*error handling */ #include "H5Fprivate.h" /*files */ #include "H5FDprivate.h" /*file driver */ #include "H5FDgass.h" /* Core file driver */ #include "H5MMprivate.h" /* Memory allocation */ #include "H5Pprivate.h" /*property lists */ #undef MAX #define MAX(X,Y) ((X)>(Y)?(X):(Y)) /* The driver identification number, initialized at runtime */ static hid_t H5FD_GASS_g = 0; #ifdef H5_HAVE_GASS /* File operations */ #define OP_UNKNOWN 0 #define OP_READ 1 #define OP_WRITE 2 /* * The description of a file belonging to this driver. The `eoa' and `eof' * determine the amount of hdf5 address space in use and the high-water mark * of the file (the current size of the underlying Unix file). The `pos' * value is used to eliminate file position updates when they would be a * no-op. Unfortunately we've found systems that use separate file position * indicators for reading and writing so the lseek can only be eliminated if * the current operation is the same as the previous operation. When opening * a file the `eof' will be set to the current file size, `eoa' will be set * to zero, `pos' will be set to H5F_ADDR_UNDEF (as it is when an error * occurs), and `op' will be set to H5F_OP_UNKNOWN. */ typedef struct H5FD_gass_t { H5FD_t pub; /*public stuff, must be first */ int fd; /*the unix file */ GASS_Info info; /*file information */ haddr_t eoa; /*end of allocated region */ haddr_t eof; /*end of file; current file size*/ haddr_t pos; /*current file I/O position */ int op; /*last operation */ } H5FD_gass_t; /* * This driver supports systems that have the lseek64() function by defining * some macros here so we don't have to have conditional compilations later * throughout the code. * * file_offset_t: The datatype for file offsets, the second argument of * the lseek() or lseek64() call. * * file_seek: The function which adjusts the current file position, * either lseek() or lseek64(). */ /* adding for windows NT file system support. */ /* pvn: added __MWERKS__ support. */ #ifdef H5_HAVE_LSEEK64 # define file_offset_t off64_t # define file_seek lseek64 #elif defined (WIN32) # ifdef __MWERKS__ # define file_offset_t off_t # define file_seek lseek # else /*MSVC*/ # define file_offset_t __int64 # define file_seek _lseeki64 # endif #else # define file_offset_t off_t # define file_seek lseek #endif /* * These macros check for overflow of various quantities. These macros * assume that file_offset_t is signed and haddr_t and size_t are unsigned. * * ADDR_OVERFLOW: Checks whether a file address of type `haddr_t' * is too large to be represented by the second argument * of the file seek function. * * SIZE_OVERFLOW: Checks whether a buffer size of type `hsize_t' is too * large to be represented by the `size_t' type. * * REGION_OVERFLOW: Checks whether an address and size pair describe data * which can be addressed entirely by the second * argument of the file seek function. */ #define MAXADDR (((haddr_t)1<<(8*sizeof(file_offset_t)-1))-1) #define ADDR_OVERFLOW(A) (HADDR_UNDEF==(A) || \ ((A) & ~(haddr_t)MAXADDR)) #define SIZE_OVERFLOW(Z) ((Z) & ~(hsize_t)MAXADDR) #define REGION_OVERFLOW(A,Z) (ADDR_OVERFLOW(A) || SIZE_OVERFLOW(Z) || \ sizeof(file_offset_t)info; FUNC_LEAVE(SUCCEED); } /*------------------------------------------------------------------------- * Function: H5FD_gass_open * * Purpose: Opens a file with name NAME. The FLAGS are a bit field with * purpose similar to the second argument of open(2) and which * are defined in H5Fpublic.h. The file access property list * FAPL_ID contains the driver properties and MAXADDR * is the largest address which this file will be expected to * access. * * Return: Success: A pointer to a new file data structure. The * public fields will be initialized by the * caller, which is always H5FD_open(). * * Failure: NULL * * Programmer: Saurabh Bagchi * Friday, August 13, 1999 * * Modifications: * *------------------------------------------------------------------------- */ static H5FD_t * H5FD_gass_open(const char *name, unsigned flags, hid_t fapl_id, haddr_t maxaddr) { int fd; struct stat sb; H5FD_gass_t *file=NULL; const H5FD_gass_fapl_t *fa=NULL; H5FD_gass_fapl_t _fa; char *filename = (char *) H5MM_malloc(80 * sizeof(char)); FUNC_ENTER(H5FD_gass_open, NULL); /* fprintf(stdout, "Entering H5FD_gass_open name=%s flags=0x%x\n", name, flags); */ /* Check arguments */ if (!name || !*name) HRETURN_ERROR(H5E_ARGS, H5E_BADVALUE, NULL, "invalid file name"); if (0==maxaddr || HADDR_UNDEF==maxaddr) HRETURN_ERROR(H5E_ARGS, H5E_BADRANGE, NULL, "bogus maxaddr"); if (ADDR_OVERFLOW(maxaddr)) HRETURN_ERROR(H5E_ARGS, H5E_BADRANGE, NULL, "bogus maxaddr"); strcpy (filename, name); /* Obtain a pointer to gass-specific file access properties */ if (H5P_DEFAULT==fapl_id || H5FD_GASS!=H5P_get_driver(fapl_id)) { GASS_INFO_NULL (_fa.info); /* _fa.info = GASS_INFO_NULL; */ /* _fa.info = {0,0}; */ /*default*/ fa = &_fa; } else { fa = H5Pget_driver_info(fapl_id); assert(fa); } /* When I come down here, the possible flag values and the correct responses are given here :- 1. H5F_ACC_CREAT | H5F_ACC_RDWR | H5F_ACC_EXCL : The file is a new one. Go ahead and open it in O_RDWR. 2. H5F_ACC_CREAT | H5F_ACC_RDWR | H5F_ACC_TRUNC : Use O_RDWR | O_TRUNC with gass_open. 3. H5F_ACC_RDWR | H5F_ACC_TRUNC : File already exists. Truncate it. 4. H5F_ACC_RDWR : Use O_RDWR with gass_open 5. H5F_ACC_RDWR is not set : Use O_RDONLY with gass_open One reason why we cannot simply pass on the flags to gass_open is that gass_open does not support many of them (e.g., O_CREAT) */ if ((flags & H5F_ACC_CREAT) && (flags & H5F_ACC_RDWR) && (flags & H5F_ACC_EXCL)) { if ((fd = globus_gass_open (filename, O_RDWR|O_TRUNC)) < 0) HRETURN_ERROR(H5E_IO, H5E_CANTOPENFILE, NULL, "open failed"); } else if ((flags & H5F_ACC_CREAT) && (flags & H5F_ACC_RDWR) && (flags & H5F_ACC_TRUNC)) { if ((fd = globus_gass_open (filename, O_RDWR|O_TRUNC)) < 0) HRETURN_ERROR(H5E_IO, H5E_CANTOPENFILE, NULL, "open failed"); } else if ((flags & H5F_ACC_RDWR) && (flags & H5F_ACC_TRUNC)) { if ((fd = globus_gass_open (filename, O_RDWR|O_TRUNC)) < 0) HRETURN_ERROR(H5E_IO, H5E_CANTOPENFILE, NULL, "open failed"); } else if (flags & H5F_ACC_RDWR) { printf ("I'm here in H5FDgass_open going to call globus_gass_open with O_RDWR. \n"); printf ("Name of URL =%s \n", filename); if ((fd = globus_gass_open (filename, O_RDWR)) < 0) HRETURN_ERROR(H5E_IO, H5E_CANTOPENFILE, NULL, "open failed"); } else { /* This is case where H5F_ACC_RDWR is not set */ if ((fd = globus_gass_open (filename, O_RDONLY)) < 0) HRETURN_ERROR(H5E_IO, H5E_CANTOPENFILE, NULL, "open failed"); } if (fstat(fd, &sb)<0) { close(fd); HRETURN_ERROR(H5E_IO, H5E_BADFILE, NULL, "fstat failed"); } /* Create the new file struct */ if (NULL==(file=H5MM_calloc(sizeof(H5FD_gass_t)))) HRETURN_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "can't allocate file struct"); file->fd = fd; file->eof = sb.st_size; file->pos = HADDR_UNDEF; file->op = OP_UNKNOWN; file->info = fa->info; FUNC_LEAVE((H5FD_t*)file); } /*------------------------------------------------------------------------- * Function: H5FD_gass_close * * Purpose: Closes a GASS file. * * Return: Success: 0 * * Failure: -1, file not closed. * * Programmer: Saurabh Bagchi * Monday, August 16, 1999 * * Modifications: * *------------------------------------------------------------------------- */ static herr_t H5FD_gass_close (H5FD_t *_file) { H5FD_gass_t *file = (H5FD_gass_t *)_file; FUNC_ENTER(H5FD_gass_close, FAIL); if (file == NULL) HRETURN_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "invalid file handle"); if (globus_gass_close (file->fd) < 0) HRETURN_ERROR(H5E_IO, H5E_CANTCLOSEFILE, FAIL, "can't close GASS file"); H5MM_xfree(file); FUNC_LEAVE(SUCCEED); } /*------------------------------------------------------------------------- * Function: H5FD_gass_query * * Purpose: Set the flags that this VFL driver is capable of supporting. * (listed in H5FDpublic.h) * * Return: Success: non-negative * * Failure: negative * * Programmer: Quincey Koziol * Tuesday, September 26, 2000 * * Modifications: * *------------------------------------------------------------------------- */ static herr_t H5FD_gass_query(const UNUSED H5FD_t *_f, unsigned long *flags /* out */) { herr_t ret_value=SUCCEED; FUNC_ENTER(H5FD_gass_query, FAIL); /* Set the VFL feature flags that this driver supports */ if(flags) { *flags = 0; *flags|=H5FD_FEAT_DATA_SIEVE; /* OK to perform data sieving for faster raw data reads & writes */ } FUNC_LEAVE(ret_value); } /*------------------------------------------------------------------------- * Function: H5FD_gass_get_eoa * * Purpose: Gets the end-of-address marker for the file. The EOA marker * is the first address past the last byte allocated in the * format address space. * * Return: Success: The end-of-address marker. * * Failure: HADDR_UNDEF * * Programmer: Saurabh Bagchi * Monday, August 16, 1999 * * Modifications: * *------------------------------------------------------------------------- */ static haddr_t H5FD_gass_get_eoa(H5FD_t *_file) { H5FD_gass_t *file = (H5FD_gass_t *)_file; FUNC_ENTER(H5FD_gass_get_eoa, HADDR_UNDEF); FUNC_LEAVE(file->eoa); } /*------------------------------------------------------------------------- * Function: H5FD_gass_set_eoa * * Purpose: Set the end-of-address marker for the file. This function is * called shortly after an existing HDF5 file is opened in order * to tell the driver where the end of the HDF5 data is located. * * Return: Success: 0 * * Programmer: Saurabh Bagchi * Monday, August 16, 1999 * * Modifications: * *------------------------------------------------------------------------- */ static herr_t H5FD_gass_set_eoa(H5FD_t *_file, haddr_t addr) { H5FD_gass_t *file = (H5FD_gass_t *)_file; FUNC_ENTER(H5FD_gass_set_eoa, FAIL); file->eoa = addr; FUNC_LEAVE(SUCCEED); } /*------------------------------------------------------------------------- * Function: H5FD_gass_get_eof * * Purpose: Returns the end-of-file marker, which is the greater of * either the Unix end-of-file or the HDF5 end-of-address * markers. * * Return: Success: End of file address, the first address past * the end of the "file", either the Unix file * or the HDF5 file. * * Failure: HADDR_UNDEF * * Programmer: Saurabh Bagchi * Monday, August 16, 1999 * * Modifications: * *------------------------------------------------------------------------- */ static haddr_t H5FD_gass_get_eof(H5FD_t *_file) { H5FD_gass_t *file = (H5FD_gass_t*)_file; FUNC_ENTER(H5FD_gass_get_eof, HADDR_UNDEF); FUNC_LEAVE(MAX(file->eof, file->eoa)); } /*------------------------------------------------------------------------- * Function: H5FD_gass_read * * Purpose: Reads SIZE bytes of data from FILE beginning at address ADDR * into buffer BUF. * * Return: Success: Zero. Result is stored in caller-supplied * buffer BUF. * * Failure: -1, Contents of buffer BUF are undefined. * * Programmer: Saurabh Bagchi * Monday, August 16, 1999 * * Modifications: * *------------------------------------------------------------------------- */ static herr_t H5FD_gass_read(H5FD_t *_file, H5FD_mem_t UNUSED type, hid_t dxpl_id/*unused*/, haddr_t addr, size_t size, void *buf/*out*/) { H5FD_gass_t *file = (H5FD_gass_t*)_file; ssize_t nbytes; FUNC_ENTER(H5FD_gass_read, FAIL); assert(file && file->pub.cls); assert(buf); /* Check for overflow conditions */ if (HADDR_UNDEF==addr) HRETURN_ERROR(H5E_ARGS, H5E_BADRANGE, FAIL, "addr undefined"); if (REGION_OVERFLOW(addr, size)) HRETURN_ERROR(H5E_ARGS, H5E_OVERFLOW, FAIL, "addr too large"); if (addr+size>file->eoa) HRETURN_ERROR(H5E_ARGS, H5E_OVERFLOW, FAIL, "addr too large"); /* Seek to the correct location */ if ((addr!=file->pos || OP_READ!=file->op) && file_seek(file->fd, (file_offset_t)addr, SEEK_SET)<0) { file->pos = HADDR_UNDEF; file->op = OP_UNKNOWN; HRETURN_ERROR(H5E_IO, H5E_SEEKERROR, FAIL, "gass file seek failed"); } /* * Read data, being careful of interrupted system calls, partial results, * and the end of the file. */ while (size>0) { do nbytes = read(file->fd, buf, size); while (-1==nbytes && EINTR==errno); if (-1==nbytes) { /* error */ file->pos = HADDR_UNDEF; file->op = OP_UNKNOWN; HRETURN_ERROR(H5E_IO, H5E_READERROR, FAIL, "gass file read failed"); } if (0==nbytes) { /* end of file but not end of format address space */ memset(buf, 0, size); size = 0; } assert(nbytes>=0); assert(nbytes<=size); size -= (hsize_t)nbytes; addr += (haddr_t)nbytes; buf = (char*)buf + nbytes; } /* Update current position */ file->pos = addr; file->op = OP_READ; FUNC_LEAVE(SUCCEED); } /*------------------------------------------------------------------------- * Function: H5FD_gass_write * * Purpose: Writes SIZE bytes of data to FILE beginning at address ADDR * from buffer BUF. * * Return: Success: Zero * * Failure: -1 * * Programmer: Saurabh Bagchi * Tuesday, August 17, 1999 * * Modifications: * *------------------------------------------------------------------------- */ static herr_t H5FD_gass_write(H5FD_t *_file, H5FD_mem_t type, hid_t dxpl_id/*unused*/, haddr_t addr, size_t size, const void *buf) { H5FD_gass_t *file = (H5FD_gass_t*)_file; ssize_t nbytes; FUNC_ENTER(H5FD_gass_write, FAIL); assert(file && file->pub.cls); assert(buf); /* Check for overflow conditions */ if (HADDR_UNDEF==addr) HRETURN_ERROR(H5E_ARGS, H5E_BADRANGE, FAIL, "addr undefined"); if (REGION_OVERFLOW(addr, size)) HRETURN_ERROR(H5E_ARGS, H5E_OVERFLOW, FAIL, "addr too large"); if (addr+size>file->eoa) HRETURN_ERROR(H5E_ARGS, H5E_OVERFLOW, FAIL, "addr too large"); /* Seek to the correct location */ if ((addr!=file->pos || OP_WRITE!=file->op) && file_seek(file->fd, (file_offset_t)addr, SEEK_SET)<0) { file->pos = HADDR_UNDEF; file->op = OP_UNKNOWN; HRETURN_ERROR(H5E_IO, H5E_SEEKERROR, FAIL, "gass file seek failed"); } /* * Write the data, being careful of interrupted system calls and partial * results */ while (size>0) { do nbytes = write(file->fd, buf, size); while (-1==nbytes && EINTR==errno); if (-1==nbytes) { /* error */ file->pos = HADDR_UNDEF; file->op = OP_UNKNOWN; HRETURN_ERROR(H5E_IO, H5E_WRITEERROR, FAIL, "gass file write failed"); } assert(nbytes>0); assert(nbytes<=size); size -= (hsize_t)nbytes; addr += (haddr_t)nbytes; buf = (const char*)buf + nbytes; } /* Update current position and eof */ file->pos = addr; file->op = OP_WRITE; if (file->pos>file->eof) file->eof = file->pos; FUNC_LEAVE(SUCCEED); } #endif /* H5_HAVE_GASS */