51 lines
1.7 KiB
C
51 lines
1.7 KiB
C
/****************************************************************
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* *
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* Copyright 2010, 2012 Fidelity Information Services, Inc *
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* *
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* This source code contains the intellectual property *
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* of its copyright holder(s), and is made available *
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* under a license. If you do not know the terms of *
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* the license, please stop and do not read further. *
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* *
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****************************************************************/
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#include "mdef.h"
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#include "get_fs_block_size.h"
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#ifndef VMS
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#include "gtm_statvfs.h"
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#endif
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uint4 get_fs_block_size(int fd)
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{
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# ifndef VMS
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struct statvfs bufvfs;
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int status;
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# endif
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uint4 gtm_fs_block_size;
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unsigned long sys_fs_block_size;
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# if defined(__vms)
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sys_fs_block_size = DISK_BLOCK_SIZE;
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# else
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FSTATVFS(fd, &bufvfs, status);
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assert(-1 != status);
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assert(SIZEOF(sys_fs_block_size) == SIZEOF(bufvfs.f_frsize));
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/* If fstatvfs call fails, we dont know what the underlying filesystem size is.
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* We found some NFS implementations return bufvfs.f.frsize values that are inappropriate.
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* Instead of erroring out at this point, we assume a safe value (4K) and continue as much as we can.
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*/
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sys_fs_block_size = ((-1 == status) || (MAX_IO_BLOCK_SIZE < bufvfs.f_frsize)
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|| (DISK_BLOCK_SIZE > bufvfs.f_frsize)) ? 4096 : bufvfs.f_frsize;
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# endif
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/* Fit file system block size in a 4-byte unsigned integer as that is the size in jnl_buffer.
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* Assert that we never get a block size > what can be held in a 4-byte unsigned integer.
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*/
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gtm_fs_block_size = (uint4)sys_fs_block_size;
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assert(gtm_fs_block_size == sys_fs_block_size);
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assert(MAX_IO_BLOCK_SIZE >= gtm_fs_block_size);
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assert(MAX_IO_BLOCK_SIZE % gtm_fs_block_size == 0);
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return gtm_fs_block_size;
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}
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