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|
/*
* Copyright © 1999 NCSA
* All rights reserved.
*
* Programmer: Robb Matzke <matzke@llnl.gov>
* Thursday, July 29, 1999
*
* Purpose: The POSIX unbuffered file driver using only the HDF5 public
* API and with a few optimizations: the lseek() call is made
* only when the current file position is unknown or needs to be
* changed based on previous I/O through this driver (don't mix
* I/O from this driver with I/O from other parts of the
* application to the same file).
*/
#include "H5private.h" /*library functions */
#include "H5Eprivate.h" /*error handling */
#include "H5Fprivate.h" /*files */
#include "H5FDprivate.h" /*file driver */
#include "H5FDsec2.h" /*sec2 file driver */
#include "H5FLprivate.h" /*free lists */
#include "H5MMprivate.h" /*memory allocation */
#include "H5Pprivate.h" /*property lists */
#ifdef MAX
#undef MAX
#define MAX(X,Y) ((X)>(Y)?(X):(Y))
#endif /* MAX */
/* The driver identification number, initialized at runtime */
static hid_t H5FD_SEC2_g = 0;
/* 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_sec2_t {
H5FD_t pub; /*public stuff, must be first */
int fd; /*the unix file */
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 */
#ifndef WIN32
/*
* On most systems the combination of device and i-node number uniquely
* identify a file.
*/
dev_t device; /*file device number */
ino_t inode; /*file i-node number */
#else
/*
* On WIN32 the low-order word of a unique identifier associated with the
* file and the volume serial number uniquely identify a file. This number
* (which, both? -rpm) may change when the system is restarted or when the
* file is opened. After a process opens a file, the identifier is
* constant until the file is closed. An application can use this
* identifier and the volume serial number to determine whether two
* handles refer to the same file.
*/
int fileindexlo;
int fileindexhi;
#endif
} H5FD_sec2_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)<sizeof(size_t) || \
HADDR_UNDEF==(A)+(Z) || \
(file_offset_t)((A)+(Z))<(file_offset_t)(A))
/* Prototypes */
static H5FD_t *H5FD_sec2_open(const char *name, unsigned flags, hid_t fapl_id,
haddr_t maxaddr);
static herr_t H5FD_sec2_close(H5FD_t *_file);
static int H5FD_sec2_cmp(const H5FD_t *_f1, const H5FD_t *_f2);
static herr_t H5FD_sec2_query(const H5FD_t *_f1, unsigned long *flags);
static haddr_t H5FD_sec2_get_eoa(H5FD_t *_file);
static herr_t H5FD_sec2_set_eoa(H5FD_t *_file, haddr_t addr);
static haddr_t H5FD_sec2_get_eof(H5FD_t *_file);
static herr_t H5FD_sec2_read(H5FD_t *_file, H5FD_mem_t type, hid_t fapl_id, haddr_t addr,
hsize_t size, void *buf);
static herr_t H5FD_sec2_write(H5FD_t *_file, H5FD_mem_t type, hid_t fapl_id, haddr_t addr,
hsize_t size, const void *buf);
static herr_t H5FD_sec2_flush(H5FD_t *_file);
static const H5FD_class_t H5FD_sec2_g = {
"sec2", /*name */
MAXADDR, /*maxaddr */
NULL, /*sb_size */
NULL, /*sb_encode */
NULL, /*sb_decode */
0, /*fapl_size */
NULL, /*fapl_get */
NULL, /*fapl_copy */
NULL, /*fapl_free */
0, /*dxpl_size */
NULL, /*dxpl_copy */
NULL, /*dxpl_free */
H5FD_sec2_open, /*open */
H5FD_sec2_close, /*close */
H5FD_sec2_cmp, /*cmp */
H5FD_sec2_query, /*query */
NULL, /*alloc */
NULL, /*free */
H5FD_sec2_get_eoa, /*get_eoa */
H5FD_sec2_set_eoa, /*set_eoa */
H5FD_sec2_get_eof, /*get_eof */
H5FD_sec2_read, /*read */
H5FD_sec2_write, /*write */
H5FD_sec2_flush, /*flush */
H5FD_FLMAP_SINGLE, /*fl_map */
};
/* Interface initialization */
#define PABLO_MASK H5FD_sec2_mask
#define INTERFACE_INIT H5FD_sec2_init
static int interface_initialize_g = 0;
/* Declare a free list to manage the H5FD_sec2_t struct */
H5FL_DEFINE_STATIC(H5FD_sec2_t);
/*-------------------------------------------------------------------------
* Function: H5FD_sec2_init
*
* Purpose: Initialize this driver by registering the driver with the
* library.
*
* Return: Success: The driver ID for the sec2 driver.
*
* Failure: Negative.
*
* Programmer: Robb Matzke
* Thursday, July 29, 1999
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
hid_t
H5FD_sec2_init(void)
{
FUNC_ENTER(H5FD_sec2_init, FAIL);
if (H5I_VFL!=H5Iget_type(H5FD_SEC2_g))
H5FD_SEC2_g = H5FDregister(&H5FD_sec2_g);
FUNC_LEAVE(H5FD_SEC2_g);
}
/*-------------------------------------------------------------------------
* Function: H5Pset_fapl_sec2
*
* Purpose: Modify the file access property list to use the H5FD_SEC2
* driver defined in this source file. There are no driver
* specific properties.
*
* Return: Non-negative on success/Negative on failure
*
* Programmer: Robb Matzke
* Thursday, February 19, 1998
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
herr_t
H5Pset_fapl_sec2(hid_t fapl_id)
{
herr_t ret_value=FAIL;
FUNC_ENTER(H5Pset_fapl_sec2, FAIL);
H5TRACE1("e","i",fapl_id);
if (H5P_FILE_ACCESS!=H5Pget_class(fapl_id))
HRETURN_ERROR(H5E_PLIST, H5E_BADTYPE, FAIL, "not a fapl");
ret_value= H5Pset_driver(fapl_id, H5FD_SEC2, NULL);
FUNC_LEAVE(ret_value);
}
/*-------------------------------------------------------------------------
* Function: H5FD_sec2_open
*
* Purpose: Create and/or opens a Unix file as an HDF5 file.
*
* 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: Robb Matzke
* Thursday, July 29, 1999
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
static H5FD_t *
H5FD_sec2_open(const char *name, unsigned flags, hid_t UNUSED fapl_id,
haddr_t maxaddr)
{
int o_flags;
int fd;
struct stat sb;
H5FD_sec2_t *file=NULL;
#ifdef WIN32
HFILE filehandle;
struct _BY_HANDLE_FILE_INFORMATION fileinfo;
int results;
#endif
FUNC_ENTER(H5FD_sec2_open, NULL);
/* 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_OVERFLOW, NULL, "bogus maxaddr");
/* Build the open flags */
o_flags = (H5F_ACC_RDWR & flags) ? O_RDWR : O_RDONLY;
if (H5F_ACC_TRUNC & flags) o_flags |= O_TRUNC;
if (H5F_ACC_CREAT & flags) o_flags |= O_CREAT;
if (H5F_ACC_EXCL & flags) o_flags |= O_EXCL;
/* Open the file */
if ((fd=HDopen(name, o_flags, 0666))<0)
HRETURN_ERROR(H5E_FILE, H5E_CANTOPENFILE, NULL, "unable to open file");
if (fstat(fd, &sb)<0) {
close(fd);
HRETURN_ERROR(H5E_FILE, H5E_BADFILE, NULL, "unable to fstat file");
}
/* Create the new file struct */
if (NULL==(file=H5FL_ALLOC(H5FD_sec2_t,1)))
HRETURN_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL,
"unable to allocate file struct");
file->fd = fd;
file->eof = sb.st_size;
file->pos = HADDR_UNDEF;
file->op = OP_UNKNOWN;
#ifdef WIN32
filehandle = _get_osfhandle(fd);
results = GetFileInformationByHandle((HANDLE)filehandle, &fileinfo);
file->fileindexhi = fileinfo.nFileIndexHigh;
file->fileindexlo = fileinfo.nFileIndexLow;
#else
file->device = sb.st_dev;
file->inode = sb.st_ino;
#endif
FUNC_LEAVE((H5FD_t*)file);
}
/*-------------------------------------------------------------------------
* Function: H5FD_sec2_close
*
* Purpose: Closes a Unix file.
*
* Return: Success: 0
*
* Failure: -1, file not closed.
*
* Programmer: Robb Matzke
* Thursday, July 29, 1999
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
static herr_t
H5FD_sec2_close(H5FD_t *_file)
{
H5FD_sec2_t *file = (H5FD_sec2_t*)_file;
FUNC_ENTER(H5FD_sec2_close, FAIL);
if (H5FD_sec2_flush(_file)<0)
HRETURN_ERROR(H5E_IO, H5E_WRITEERROR, FAIL, "unable to flush file");
if (close(file->fd)<0)
HRETURN_ERROR(H5E_IO, H5E_CANTCLOSEFILE, FAIL, "unable to close file");
H5FL_FREE(H5FD_sec2_t,file);
FUNC_LEAVE(SUCCEED);
}
/*-------------------------------------------------------------------------
* Function: H5FD_sec2_cmp
*
* Purpose: Compares two files belonging to this driver using an
* arbitrary (but consistent) ordering.
*
* Return: Success: A value like strcmp()
*
* Failure: never fails (arguments were checked by the
* caller).
*
* Programmer: Robb Matzke
* Thursday, July 29, 1999
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
static int
H5FD_sec2_cmp(const H5FD_t *_f1, const H5FD_t *_f2)
{
const H5FD_sec2_t *f1 = (const H5FD_sec2_t*)_f1;
const H5FD_sec2_t *f2 = (const H5FD_sec2_t*)_f2;
int ret_value=0;
FUNC_ENTER(H5FD_sec2_cmp, H5FD_VFD_DEFAULT);
#ifdef WIN32
if (f1->fileindexhi < f2->fileindexhi) ret_value= -1;
if (f1->fileindexhi > f2->fileindexhi) ret_value= 1;
if (f1->fileindexlo < f2->fileindexlo) ret_value= -1;
if (f1->fileindexlo > f2->fileindexlo) ret_value= 1;
#else
if (f1->device < f2->device) ret_value= -1;
if (f1->device > f2->device) ret_value= 1;
if (f1->inode < f2->inode) ret_value= -1;
if (f1->inode > f2->inode) ret_value= 1;
#endif
FUNC_LEAVE(ret_value);
}
/*-------------------------------------------------------------------------
* Function: H5FD_sec2_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
* Friday, August 25, 2000
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
static herr_t
H5FD_sec2_query(const H5FD_t UNUSED *_f, unsigned long *flags /* out */)
{
herr_t ret_value=SUCCEED;
FUNC_ENTER(H5FD_sec2_query, FAIL);
/* Set the VFL feature flags that this driver supports */
if(flags) {
*flags = 0;
*flags|=H5FD_FEAT_AGGREGATE_METADATA; /* OK to aggregate metadata allocations */
*flags|=H5FD_FEAT_ACCUMULATE_METADATA; /* OK to accumulate metadata for faster writes */
*flags|=H5FD_FEAT_DATA_SIEVE; /* OK to perform data sieving for faster raw data reads & writes */
}
FUNC_LEAVE(ret_value);
}
/*-------------------------------------------------------------------------
* Function: H5FD_sec2_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: Robb Matzke
* Monday, August 2, 1999
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
static haddr_t
H5FD_sec2_get_eoa(H5FD_t *_file)
{
H5FD_sec2_t *file = (H5FD_sec2_t*)_file;
FUNC_ENTER(H5FD_sec2_get_eoa, HADDR_UNDEF);
FUNC_LEAVE(file->eoa);
}
/*-------------------------------------------------------------------------
* Function: H5FD_sec2_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
*
* Failure: -1
*
* Programmer: Robb Matzke
* Thursday, July 29, 1999
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
static herr_t
H5FD_sec2_set_eoa(H5FD_t *_file, haddr_t addr)
{
H5FD_sec2_t *file = (H5FD_sec2_t*)_file;
FUNC_ENTER(H5FD_sec2_set_eoa, FAIL);
file->eoa = addr;
FUNC_LEAVE(SUCCEED);
}
/*-------------------------------------------------------------------------
* Function: H5FD_sec2_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: Robb Matzke
* Thursday, July 29, 1999
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
static haddr_t
H5FD_sec2_get_eof(H5FD_t *_file)
{
H5FD_sec2_t *file = (H5FD_sec2_t*)_file;
FUNC_ENTER(H5FD_get_get_eof, HADDR_UNDEF);
FUNC_LEAVE(MAX(file->eof, file->eoa));
}
/*-------------------------------------------------------------------------
* Function: H5FD_sec2_read
*
* Purpose: Reads SIZE bytes of data from FILE beginning at address ADDR
* into buffer BUF according to data transfer properties in
* DXPL_ID.
*
* Return: Success: Zero. Result is stored in caller-supplied
* buffer BUF.
*
* Failure: -1, Contents of buffer BUF are undefined.
*
* Programmer: Robb Matzke
* Thursday, July 29, 1999
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
static herr_t
H5FD_sec2_read(H5FD_t *_file, H5FD_mem_t UNUSED type, hid_t UNUSED dxpl_id, haddr_t addr,
hsize_t size, void *buf/*out*/)
{
H5FD_sec2_t *file = (H5FD_sec2_t*)_file;
ssize_t nbytes;
FUNC_ENTER(H5FD_sec2_read, FAIL);
assert(file && file->pub.cls);
assert(buf);
/* Check for overflow conditions */
if (HADDR_UNDEF==addr)
HRETURN_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "addr undefined");
if (REGION_OVERFLOW(addr, size))
HRETURN_ERROR(H5E_ARGS, H5E_OVERFLOW, FAIL, "addr overflow");
if (addr+size>file->eoa)
HRETURN_ERROR(H5E_ARGS, H5E_OVERFLOW, FAIL, "addr overflow");
/* 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,
"unable to seek to proper position");
}
/*
* Read data, being careful of interrupted system calls, partial results,
* and the end of the file.
*/
while (size>0) {
do {
assert(size==(hsize_t)((size_t)size)); /*check for overflow*/
nbytes = HDread(file->fd, buf, (size_t)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, "file read failed");
}
if (0==nbytes) {
/* end of file but not end of format address space */
assert(size==(hsize_t)((size_t)size)); /*check for overflow*/
HDmemset(buf, 0, (size_t)size);
size = 0;
}
assert(nbytes>=0);
assert((hsize_t)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_sec2_write
*
* Purpose: Writes SIZE bytes of data to FILE beginning at address ADDR
* from buffer BUF according to data transfer properties in
* DXPL_ID.
*
* Return: Success: Zero
*
* Failure: -1
*
* Programmer: Robb Matzke
* Thursday, July 29, 1999
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
static herr_t
H5FD_sec2_write(H5FD_t *_file, H5FD_mem_t UNUSED type, hid_t UNUSED dxpl_id, haddr_t addr,
hsize_t size, const void *buf)
{
H5FD_sec2_t *file = (H5FD_sec2_t*)_file;
ssize_t nbytes;
FUNC_ENTER(H5FD_sec2_write, FAIL);
assert(file && file->pub.cls);
assert(buf);
/* Check for overflow conditions */
if (HADDR_UNDEF==addr)
HRETURN_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "addr undefined");
if (REGION_OVERFLOW(addr, size))
HRETURN_ERROR(H5E_ARGS, H5E_OVERFLOW, FAIL, "addr overflow");
if (addr+size>file->eoa)
HRETURN_ERROR(H5E_ARGS, H5E_OVERFLOW, FAIL, "addr overflow");
/* 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,
"unable to seek to proper position");
}
/*
* Write the data, being careful of interrupted system calls and partial
* results
*/
while (size>0) {
do {
assert(size==(hsize_t)((size_t)size)); /*check for overflow*/
nbytes = HDwrite(file->fd, buf, (size_t)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, "file write failed");
}
assert(nbytes>0);
assert((hsize_t)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);
}
/*-------------------------------------------------------------------------
* Function: H5FD_sec2_flush
*
* Purpose: Makes sure that the true file size is the same (or larger)
* than the end-of-address.
*
* Return: Success: Non-negative
*
* Failure: Negative
*
* Programmer: Robb Matzke
* Wednesday, August 4, 1999
*
* Modifications:
*
*-------------------------------------------------------------------------
*/
static herr_t
H5FD_sec2_flush(H5FD_t *_file)
{
H5FD_sec2_t *file = (H5FD_sec2_t*)_file;
FUNC_ENTER(H5FD_sec2_seek, FAIL);
if (file->eoa>file->eof) {
if (-1==file_seek(file->fd, (file_offset_t)(file->eoa-1), SEEK_SET))
HRETURN_ERROR(H5E_IO, H5E_SEEKERROR, FAIL,
"unable to seek to proper position");
if (write(file->fd, "", 1)!=1)
HRETURN_ERROR(H5E_IO, H5E_WRITEERROR, FAIL, "file write failed");
file->eof = file->eoa;
file->pos = file->eoa;
file->op = OP_WRITE;
}
FUNC_LEAVE(SUCCEED);
}
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