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/***************************************************************************
*
* Copyright (c) 1997-2022 Jeff V. Merkey
* 7260 SE Tenino St.
* Portland, Oregon 97206
* jeffmerkey@gmail.com
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the Lesser GNU Public License as published by the
* Free Software Foundation, version 2.1, or 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
* General Public License for more details.
*
* Original Authorship :
* source code written by Jeff V. Merkey
*
* Original Contributors :
* Jeff V. Merkey
*
*
*
****************************************************************************
*
*
* AUTHOR : Jeff V. Merkey (jeffmerkey@gmail.com)
* FILE : FILE.C
* DESCRIP : VFS File Module for Linux
* DATE : December 6, 1998
*
*
***************************************************************************/
#include "globals.h"
#if (LINUX_24)
extern ULONG nwfs_to_linux_error(ULONG NwfsError);
int nwfs_open(struct inode *inode, struct file *file)
{
// clear read ahead info
file->private_data = NULL;
return 0;
}
int nwfs_close(struct inode *inode, struct file *file)
{
register ULONG retCode;
register VOLUME *volume = (VOLUME *) inode->i_sb->u.generic_sbp;
register HASH *hash = (HASH *) inode->u.generic_ip;
DOS dos;
#if (VFS_VERBOSE)
NWFSPrint("nwfs: close called\n");
#endif
// clear read ahead info
file->private_data = NULL;
// We perform a truncate operation on the file during close to force
// allocation of a suballoc element. We do not allocate suballoc
// elements during write because this results in excessive copying
// and impacts performance very significantly . We actualy perform the
// suballocation only when we A) truncate a file, or B) close a file.
// In the case of close, we simply truncate the cluster chain to
// the reported file size.
// if suballocation is disabled for this volume, then exit.
if (!(volume->VolumeFlags & SUB_ALLOCATION_ON))
return 0;
if (!hash)
return 0;
NWLockFileExclusive(hash);
// see if the modified flag was set for this file. if not, then
// the file is unchanged so we will exit.
if (!(hash->State & NWFS_MODIFIED))
{
NWUnlockFile(hash);
return 0;
}
// clear modified flag
hash->State &= ~NWFS_MODIFIED;
retCode = ReadDirectoryRecord(volume, &dos, inode->i_ino);
if (retCode)
{
NWUnlockFile(hash);
NWFSPrint("nwfs: inode number (%d) read dir error [%d]\n",
(int)inode->i_ino, (int)retCode);
return -EIO;
}
// if this file does not allow suballocation, then exit.
if ((dos.FileAttributes & NO_SUBALLOC) || (dos.FileAttributes & TRANSACTION))
{
NWUnlockFile(hash);
return 0;
}
// if the fat chain is already empty, then don't try to truncate
// the file. Truncating the file to it's current filesize will
// force a suballocation.
hash->TurboFATCluster = 0;
hash->TurboFATIndex = 0;
retCode = TruncateClusterChain(volume,
&dos.FirstBlock,
0,
0,
inode->i_size,
TRUE,
dos.FileAttributes);
if (retCode)
{
NWUnlockFile(hash);
NWFSPrint("nwfs: error in truncate cluster chain (%d)\n",
(int)retCode);
return 0;
}
// set file to new size.
dos.FileSize = inode->i_size;
#if (HASH_FAT_CHAINS)
hash->FirstBlock = dos.FirstBlock;
hash->FileSize = dos.FileSize;
#endif
retCode = WriteDirectoryRecord(volume, &dos, inode->i_ino);
if (retCode)
{
NWUnlockFile(hash);
NWFSPrint("nwfs: inode number (%d) directory write error [%d]\n",
(int)inode->i_ino, (int)retCode);
return 0;
}
NWUnlockFile(hash);
return 0;
}
int nwfs_fsync(struct file *file, struct dentry *dentry)
{
register struct inode *inode = dentry->d_inode;
register VOLUME *volume = inode->i_sb->u.generic_sbp;
register HASH *hash = (HASH *) inode->u.generic_ip;
register ULONG ccode = 0;
extern ULONG NWSyncFile(VOLUME *, HASH *);
if (!hash)
return 0;
NWLockFileExclusive(hash);
ccode = NWSyncFile(volume, hash);
NWUnlockFile(hash);
#if (!DO_ASYNCH_IO && LINUX_BUFFER_CACHE)
// if we are double buffering in the Linux buffer cache, then flush
// any disks currently owned by NWFS
SyncDisks();
#endif
if (ccode)
ccode = -EPERM;
return ccode;
}
void nwfs_truncate(struct inode *inode)
{
register ULONG retCode;
register VOLUME *volume = (VOLUME *) inode->i_sb->u.generic_sbp;
register HASH *hash = (HASH *) inode->u.generic_ip;
DOS dos;
if (!hash)
return;
NWLockFileExclusive(hash);
retCode = ReadDirectoryRecord(volume, &dos, inode->i_ino);
if (retCode)
{
NWUnlockFile(hash);
NWFSPrint("nwfs: inode number (%d) read dir error [%d]\n",
(int)inode->i_ino, (int)retCode);
return;
}
// if the fat chain is already empty, then don't try to truncate
// the file
hash->TurboFATCluster = 0;
hash->TurboFATIndex = 0;
retCode = TruncateClusterChain(volume,
&dos.FirstBlock,
0,
0,
inode->i_size,
(volume->VolumeFlags & SUB_ALLOCATION_ON) ? 1 : 0,
dos.FileAttributes);
if (retCode)
{
NWUnlockFile(hash);
NWFSPrint("nwfs: error in truncate cluster chain (%d)\n",
(int)retCode);
return;
}
#if (VFS_VERBOSE)
NWFSPrint("truncate: FileSize(%d) -> NewSize(%d)\n",
(int)dos.FileSize, (int)inode->i_size);
#endif
// set file to new size.
dos.FileSize = inode->i_size;
#if (HASH_FAT_CHAINS)
hash->FirstBlock = dos.FirstBlock;
hash->FileSize = dos.FileSize;
#endif
// update NetWare directory entry with modified date and time
dos.LastUpdatedDateAndTime = NWFSSystemToNetwareTime(NWFSGetSystemTime());
retCode = WriteDirectoryRecord(volume, &dos, inode->i_ino);
if (retCode)
{
NWUnlockFile(hash);
NWFSPrint("nwfs: inode number (%d) directory write error [%d]\n",
(int)inode->i_ino, (int)retCode);
return;
}
inode->i_mtime = NWFSGetSystemTime();
mark_inode_dirty(inode);
NWUnlockFile(hash);
return;
}
int nwfs_file_read(struct file *file, char *buf, size_t count, loff_t *ppos)
{
struct dentry *dentry = file->f_dentry;
struct inode *inode = dentry->d_inode;
register VOLUME *volume = (VOLUME *) inode->i_sb->u.generic_sbp;
register HASH *hash = (HASH *) inode->u.generic_ip;
register ULONG len, offset, next;
ULONG retCode;
#if (!HASH_FAT_CHAINS)
DOS dos;
#endif
off_t pos;
pos = *ppos;
if ((pos + count) > inode->i_size)
count = inode->i_size - pos;
if (count <= 0)
return 0;
if (!hash)
return 0;
NWLockFile(hash);
#if (!HASH_FAT_CHAINS)
retCode = ReadDirectoryRecord(volume, &dos, inode->i_ino);
if (retCode)
{
NWUnlockFile(hash);
NWFSPrint("nwfs: inode number (%d) file read error [%d]\n",
(int)inode->i_ino, (int)retCode);
return -EIO;
}
#endif
offset = (ULONG) pos;
next = (ULONG)file->private_data;
if (next == offset)
hash->State |= NWFS_SEQUENTIAL;
else
hash->State &= ~NWFS_SEQUENTIAL;
file->private_data = (void *)(offset + count);
len = NWReadFile(volume,
#if (HASH_FAT_CHAINS)
&hash->FirstBlock,
hash->Flags,
hash->FileSize,
#else
&dos.FirstBlock,
dos.Flags,
dos.FileSize,
#endif
offset,
buf,
count,
#if (TURBO_FAT_ON)
&hash->TurboFATCluster,
&hash->TurboFATIndex,
#else
0, 0,
#endif
&retCode,
USER_ADDRESS_SPACE,
((volume->VolumeFlags & SUB_ALLOCATION_ON) ? 1 : 0),
#if (HASH_FAT_CHAINS)
hash->FileAttributes,
#else
dos.FileAttributes,
#endif
(hash->State & NWFS_SEQUENTIAL) ? TRUE : 0);
#if (VFS_VERBOSE)
NWFSPrint("read_file: context-%08X index-%08X offset-%d size-%d\n",
(unsigned int)hash->TurboFATCluster,
(unsigned int)hash->TurboFATIndex,
(int)offset, (int)count);
#endif
if (retCode)
{
NWUnlockFile(hash);
return (nwfs_to_linux_error(retCode));
}
*ppos = (pos + len);
if (!IS_RDONLY(inode))
{
inode->i_atime = NWFSGetSystemTime();
mark_inode_dirty(inode);
}
NWUnlockFile(hash);
return len;
}
int nwfs_read_file_link(struct inode *inode, char *buf, size_t count,
loff_t *ppos)
{
register VOLUME *volume = (VOLUME *) inode->i_sb->u.generic_sbp;
register HASH *hash = (HASH *) inode->u.generic_ip;
register ULONG len, offset;
ULONG retCode;
#if (!HASH_FAT_CHAINS)
DOS dos;
#endif
off_t pos;
pos = *ppos;
if ((pos + count) > inode->i_size)
count = inode->i_size - pos;
if (count <= 0)
return 0;
if (!hash)
return 0;
NWLockFile(hash);
#if (!HASH_FAT_CHAINS)
retCode = ReadDirectoryRecord(volume, &dos, inode->i_ino);
if (retCode)
{
NWUnlockFile(hash);
NWFSPrint("nwfs: inode number (%d) file read error [%d]\n",
(int)inode->i_ino, (int)retCode);
return -EIO;
}
#endif
offset = (ULONG) pos;
len = NWReadFile(volume,
#if (HASH_FAT_CHAINS)
&hash->FirstBlock,
hash->Flags,
hash->FileSize,
#else
&dos.FirstBlock,
dos.Flags,
dos.FileSize,
#endif
offset,
buf,
count,
#if (TURBO_FAT_ON)
&hash->TurboFATCluster,
&hash->TurboFATIndex,
#else
0, 0,
#endif
&retCode,
KERNEL_ADDRESS_SPACE,
((volume->VolumeFlags & SUB_ALLOCATION_ON) ? 1 : 0),
#if (HASH_FAT_CHAINS)
hash->FileAttributes,
#else
dos.FileAttributes,
#endif
(hash->State & NWFS_SEQUENTIAL) ? TRUE : 0);
#if (VFS_VERBOSE)
NWFSPrint("read_kernel_file: ctx-%08X ndx-%08X off-%d sz-%d rc-%d len-%d\n",
(unsigned int)hash->TurboFATCluster,
(unsigned int)hash->TurboFATIndex,
(int)offset, (int)count, (int)retCode, (int)len);
#endif
if (retCode)
{
NWUnlockFile(hash);
return (nwfs_to_linux_error(retCode));
}
*ppos = (pos + len);
if (!IS_RDONLY(inode))
{
inode->i_atime = NWFSGetSystemTime();
mark_inode_dirty(inode);
}
NWUnlockFile(hash);
return len;
}
int nwfs_file_read_kernel(struct file *file, char *buf, size_t count, loff_t *ppos)
{
struct dentry *dentry = file->f_dentry;
struct inode *inode = dentry->d_inode;
register VOLUME *volume = (VOLUME *) inode->i_sb->u.generic_sbp;
register HASH *hash = (HASH *) inode->u.generic_ip;
register ULONG len, offset, next;
ULONG retCode;
#if (!HASH_FAT_CHAINS)
DOS dos;
#endif
off_t pos;
pos = *ppos;
if ((pos + count) > inode->i_size)
count = inode->i_size - pos;
if (count <= 0)
return 0;
if (!hash)
return 0;
NWLockFile(hash);
#if (!HASH_FAT_CHAINS)
retCode = ReadDirectoryRecord(volume, &dos, inode->i_ino);
if (retCode)
{
NWUnlockFile(hash);
NWFSPrint("nwfs: inode number (%d) file read error [%d]\n",
(int)inode->i_ino, (int)retCode);
return -EIO;
}
#endif
offset = (ULONG) pos;
next = (ULONG)file->private_data;
if (next == offset)
hash->State |= NWFS_SEQUENTIAL;
else
hash->State &= ~NWFS_SEQUENTIAL;
file->private_data = (void *)(offset + count);
len = NWReadFile(volume,
#if (HASH_FAT_CHAINS)
&hash->FirstBlock,
hash->Flags,
hash->FileSize,
#else
&dos.FirstBlock,
dos.Flags,
dos.FileSize,
#endif
offset,
buf,
count,
#if (TURBO_FAT_ON)
&hash->TurboFATCluster,
&hash->TurboFATIndex,
#else
0, 0,
#endif
&retCode,
KERNEL_ADDRESS_SPACE,
((volume->VolumeFlags & SUB_ALLOCATION_ON) ? 1 : 0),
#if (HASH_FAT_CHAINS)
hash->FileAttributes,
#else
dos.FileAttributes,
#endif
(hash->State & NWFS_SEQUENTIAL) ? TRUE : 0);
#if (VFS_VERBOSE)
NWFSPrint("read_kernel_file: context-%08X index-%08X offset-%d size-%d\n",
(unsigned int)hash->TurboFATCluster,
(unsigned int)hash->TurboFATIndex,
(int)offset, (int)count);
#endif
if (retCode)
{
NWUnlockFile(hash);
return (nwfs_to_linux_error(retCode));
}
*ppos = (pos + len);
if (!IS_RDONLY(inode))
{
inode->i_atime = NWFSGetSystemTime();
mark_inode_dirty(inode);
}
NWUnlockFile(hash);
return len;
}
int nwfs_file_write(struct file *file, const char *buf, size_t count, loff_t *ppos)
{
struct dentry *dentry = file->f_dentry;
struct inode *inode = dentry->d_inode;
register VOLUME *volume = (VOLUME *) inode->i_sb->u.generic_sbp;
register HASH *hash = (HASH *) inode->u.generic_ip;
ULONG retCode;
register ULONG len = 0;
DOS dos;
off_t pos;
if (inode == NULL)
{
NWFSPrint("nwfs: inode = NULL\n");
return -EINVAL;
}
if (count <= 0)
return 0;
pos = *ppos;
if (file->f_flags & O_APPEND)
{
pos = inode->i_size;
}
if (!hash)
return -ENOENT;
NWLockFileExclusive(hash);
retCode = ReadDirectoryRecord(volume, &dos, inode->i_ino);
if (retCode)
{
NWUnlockFile(hash);
NWFSPrint("nwfs: inode number (%d) file write error [%d]\n",
(int)inode->i_ino, (int)retCode);
return -ENOENT;
}
len = NWWriteFile(volume,
&dos.FirstBlock,
dos.Flags,
pos,
(void *)buf,
count,
#if (TURBO_FAT_ON)
&hash->TurboFATCluster,
&hash->TurboFATIndex,
#else
0, 0,
#endif
&retCode,
USER_ADDRESS_SPACE,
((volume->VolumeFlags & SUB_ALLOCATION_ON) ? 1 : 0),
dos.FileAttributes);
#if (VFS_VERBOSE)
NWFSPrint("write_file: context-%08X index-%08X offset-%d size-%d\n",
(unsigned int)hash->TurboFATCluster,
(unsigned int)hash->TurboFATIndex,
(int)pos, (int)count);
#endif
if (retCode)
{
NWUnlockFile(hash);
return (nwfs_to_linux_error(retCode));
}
pos += len;
*ppos = pos;
if (pos > inode->i_size)
{
inode->i_size = pos;
// file size changed, update directory entry
dos.FileSize = pos;
}
#if (HASH_FAT_CHAINS)
hash->FirstBlock = dos.FirstBlock;
hash->FileSize = dos.FileSize;
#endif
// update NetWare directory entry with modified date and time
dos.LastUpdatedDateAndTime = NWFSSystemToNetwareTime(NWFSGetSystemTime());
retCode = WriteDirectoryRecord(volume, &dos, inode->i_ino);
if (retCode)
{
NWUnlockFile(hash);
NWFSPrint("nwfs: inode number (%d) directory write error [%d]\n",
(int)inode->i_ino, (int)retCode);
return -EIO;
}
// set the modified flag so close will know to perform suballocation
// of this file stream.
hash->State |= NWFS_MODIFIED;
// update the modified time for this file.
inode->i_mtime = NWFSGetSystemTime();
mark_inode_dirty(inode);
NWUnlockFile(hash);
return len;
}
int nwfs_permission(struct inode *inode, int mask)
{
unsigned short mode = inode->i_mode;
// Nobody gets write access to a file on a readonly-fs
if ((mask & S_IWOTH) && (S_ISREG(mode) || S_ISDIR(mode) ||
S_ISLNK(mode)) && IS_RDONLY(inode))
return -EROFS;
// Nobody gets write access to an immutable file
if ((mask & S_IWOTH) && IS_IMMUTABLE(inode))
return -EACCES;
// If no ACL, checks using the file mode
else
if (current->fsuid == inode->i_uid)
mode >>= 6;
else
if (in_group_p (inode->i_gid))
mode >>= 3;
// Access is always granted for root. We now check last,
// though, for BSD process accounting correctness
if (((mode & mask & S_IRWXO) == mask) || capable(CAP_DAC_OVERRIDE))
return 0;
if ((mask == S_IROTH) || (S_ISDIR(mode) && !(mask & ~(S_IROTH | S_IXOTH))))
if (capable(CAP_DAC_READ_SEARCH))
return 0;
return -EACCES;
}
struct file_operations nwfs_file_operations =
{
#if (PAGE_CACHE_ON)
read: generic_file_read,
write: generic_file_write,
#else
read: nwfs_file_read,
write: nwfs_file_write,
#endif
ioctl: nwfs_ioctl,
mmap: generic_file_mmap,
open: nwfs_open,
release: nwfs_close,
// fsync: nwfs_fsync
};
struct inode_operations nwfs_file_inode_operations =
{
truncate: nwfs_truncate,
permission: nwfs_permission,
setattr: nwfs_notify_change,
};
#endif
#if (LINUX_22)
extern ULONG nwfs_to_linux_error(ULONG NwfsError);
int nwfs_open(struct inode *inode, struct file *file)
{
#if (VFS_VERBOSE)
NWFSPrint("nwfs_open inode no %d size-%d %s\n", (int)inode->i_ino,
(int)inode->i_size,
file->f_dentry->d_name.name);
#endif
// clear read ahead info
file->private_data = NULL;
return 0;
}
int nwfs_close(struct inode *inode, struct file *file)
{
register ULONG retCode;
register VOLUME *volume = (VOLUME *) inode->i_sb->u.generic_sbp;
register HASH *hash = (HASH *) inode->u.generic_ip;
DOS dos;
#if (VFS_VERBOSE)
NWFSPrint("nwfs_close inode no %d size-%d %s\n", (int)inode->i_ino,
(int)inode->i_size,
file->f_dentry->d_name.name);
#endif
// clear read ahead info
file->private_data = NULL;
// We perform a truncate operation on the file during close to force
// allocation of a suballoc element. We do not allocate suballoc
// elements during write because this results in excessive copying
// and impacts performance very significantly . We actualy perform the
// suballocation only when we A) truncate a file, or B) close a file.
// In the case of close, we simply truncate the cluster chain to
// the reported file size.
// if suballocation is disabled for this volume, then exit.
if (!(volume->VolumeFlags & SUB_ALLOCATION_ON))
return 0;
if (!hash)
return 0;
NWLockFileExclusive(hash);
// see if the modified flag was set for this file. if not, then
// the file is unchanged so we will exit.
if (!(hash->State & NWFS_MODIFIED))
{
NWUnlockFile(hash);
return 0;
}
// clear modified flag
hash->State &= ~NWFS_MODIFIED;
retCode = ReadDirectoryRecord(volume, &dos, inode->i_ino);
if (retCode)
{
NWUnlockFile(hash);
NWFSPrint("nwfs: inode number (%d) read dir error [%d]\n",
(int)inode->i_ino, (int)retCode);
return -EIO;
}
// if this file does not allow suballocation, then exit.
if ((dos.FileAttributes & NO_SUBALLOC) || (dos.FileAttributes & TRANSACTION))
{
NWUnlockFile(hash);
return 0;
}
// if the fat chain is already empty, then don't try to truncate
// the file. Truncating the file to it's current filesize will
// force a suballocation.
hash->TurboFATCluster = 0;
hash->TurboFATIndex = 0;
retCode = TruncateClusterChain(volume,
&dos.FirstBlock,
0,
0,
inode->i_size,
TRUE,
dos.FileAttributes);
if (retCode)
{
NWUnlockFile(hash);
NWFSPrint("nwfs: error in truncate cluster chain (%d)\n",
(int)retCode);
return 0;
}
// set file to new size.
dos.FileSize = inode->i_size;
#if (HASH_FAT_CHAINS)
hash->FirstBlock = dos.FirstBlock;
hash->FileSize = dos.FileSize;
#endif
retCode = WriteDirectoryRecord(volume, &dos, inode->i_ino);
if (retCode)
{
NWUnlockFile(hash);
NWFSPrint("nwfs: inode number (%d) directory write error [%d]\n",
(int)inode->i_ino, (int)retCode);
return 0;
}
NWUnlockFile(hash);
return 0;
}
int nwfs_fsync(struct file *file, struct dentry *dentry)
{
register struct inode *inode = dentry->d_inode;
register VOLUME *volume = inode->i_sb->u.generic_sbp;
register HASH *hash = (HASH *) inode->u.generic_ip;
register ULONG ccode = 0;
extern ULONG NWSyncFile(VOLUME *, HASH *);
#if (VFS_VERBOSE)
NWFSPrint("nwfs_sync inode no %d %s\n", (int)inode->i_ino,
dentry->d_name.name);
#endif
if (!hash)
return 0;
NWLockFileExclusive(hash);
ccode = NWSyncFile(volume, hash);
NWUnlockFile(hash);
#if (!DO_ASYNCH_IO && LINUX_BUFFER_CACHE)
// if we are double buffering in the Linux buffer cache, then flush
// any disks currently owned by NWFS
SyncDisks();
#endif
if (ccode)
ccode = -EPERM;
return ccode;
}
void nwfs_truncate(struct inode *inode)
{
register ULONG retCode;
register VOLUME *volume = (VOLUME *) inode->i_sb->u.generic_sbp;
register HASH *hash = (HASH *) inode->u.generic_ip;
DOS dos;
#if (VFS_VERBOSE)
NWFSPrint("nwfs_truncate inode no %d size %d %s\n",
(int)inode->i_ino, (int)inode->i_size,
hash->Name);
#endif
if (!hash)
return;
NWLockFileExclusive(hash);
retCode = ReadDirectoryRecord(volume, &dos, inode->i_ino);
if (retCode)
{
NWUnlockFile(hash);
NWFSPrint("nwfs: inode number (%d) read dir error [%d]\n",
(int)inode->i_ino, (int)retCode);
return;
}
// if the fat chain is already empty, then don't try to truncate
// the file
hash->TurboFATCluster = 0;
hash->TurboFATIndex = 0;
retCode = TruncateClusterChain(volume,
&dos.FirstBlock,
0,
0,
inode->i_size,
(volume->VolumeFlags & SUB_ALLOCATION_ON) ? 1 : 0,
dos.FileAttributes);
if (retCode)
{
NWUnlockFile(hash);
NWFSPrint("nwfs: error in truncate cluster chain (%d)\n",
(int)retCode);
return;
}
#if (VFS_VERBOSE)
NWFSPrint("truncate: FileSize(%d) -> NewSize(%d)\n",
(int)dos.FileSize, (int)inode->i_size);
#endif
// set file to new size.
dos.FileSize = inode->i_size;
#if (HASH_FAT_CHAINS)
hash->FirstBlock = dos.FirstBlock;
hash->FileSize = dos.FileSize;
#endif
// update NetWare directory entry with modified date and time
dos.LastUpdatedDateAndTime = NWFSSystemToNetwareTime(NWFSGetSystemTime());
retCode = WriteDirectoryRecord(volume, &dos, inode->i_ino);
if (retCode)
{
NWUnlockFile(hash);
NWFSPrint("nwfs: inode number (%d) directory write error [%d]\n",
(int)inode->i_ino, (int)retCode);
return;
}
inode->i_mtime = NWFSGetSystemTime();
mark_inode_dirty(inode);
NWUnlockFile(hash);
return;
}
int nwfs_file_read(struct file *file, char *buf, size_t count, loff_t *ppos)
{
struct dentry *dentry = file->f_dentry;
struct inode *inode = dentry->d_inode;
register VOLUME *volume = (VOLUME *) inode->i_sb->u.generic_sbp;
register HASH *hash = (HASH *) inode->u.generic_ip;
register ULONG len, offset, next;
ULONG retCode;
#if (!HASH_FAT_CHAINS)
DOS dos;
#endif
off_t pos;
pos = *ppos;
if ((pos + count) > inode->i_size)
count = inode->i_size - pos;
if (count <= 0)
return 0;
if (!hash)
return 0;
NWLockFile(hash);
#if (!HASH_FAT_CHAINS)
retCode = ReadDirectoryRecord(volume, &dos, inode->i_ino);
if (retCode)
{
NWUnlockFile(hash);
NWFSPrint("nwfs: inode number (%d) file read error [%d]\n",
(int)inode->i_ino, (int)retCode);
return -EIO;
}
#endif
offset = (ULONG) pos;
next = (ULONG)file->private_data;
if (next == offset)
hash->State |= NWFS_SEQUENTIAL;
else
hash->State &= ~NWFS_SEQUENTIAL;
file->private_data = (void *)(offset + count);
len = NWReadFile(volume,
#if (HASH_FAT_CHAINS)
&hash->FirstBlock,
hash->Flags,
hash->FileSize,
#else
&dos.FirstBlock,
dos.Flags,
dos.FileSize,
#endif
offset,
buf,
count,
#if (TURBO_FAT_ON)
&hash->TurboFATCluster,
&hash->TurboFATIndex,
#else
0, 0,
#endif
&retCode,
USER_ADDRESS_SPACE,
((volume->VolumeFlags & SUB_ALLOCATION_ON) ? 1 : 0),