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e8156439f2
This replaces the internal explicit dev/ino file id representation by a
"struct file_id". This is necessary as cluster file systems and NFS
don't necessarily assign the same device number to the shared file
system. With this structure in place we can now easily add different
schemes to map a file to a unique 64-bit device node.
Jeremy, you might note that I did not change the external interface of
smb_share_modes.c.
Volker
(This used to be commit 9b10dbbd5d)
92 lines
2.7 KiB
C
92 lines
2.7 KiB
C
/*
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Unix SMB/CIFS implementation.
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SMB parameters and setup, plus a whole lot more.
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Copyright (C) Jeremy Allison 2006
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef _LOCKING_H
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#define _LOCKING_H
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/* passed to br lock code - the UNLOCK_LOCK should never be stored into the tdb
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and is used in calculating POSIX unlock ranges only. We differentiate between
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PENDING read and write locks to allow posix lock downgrades to trigger a lock
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re-evaluation. */
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enum brl_type {READ_LOCK, WRITE_LOCK, PENDING_READ_LOCK, PENDING_WRITE_LOCK, UNLOCK_LOCK};
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enum brl_flavour {WINDOWS_LOCK = 0, POSIX_LOCK = 1};
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#define IS_PENDING_LOCK(type) ((type) == PENDING_READ_LOCK || (type) == PENDING_WRITE_LOCK)
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/* This contains elements that differentiate locks. The smbpid is a
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client supplied pid, and is essentially the locking context for
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this client */
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struct lock_context {
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uint32 smbpid;
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uint16 tid;
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struct server_id pid;
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};
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struct files_struct;
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struct file_id {
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/* we don't use SMB_DEV_T and SMB_INO_T as we want a fixed size here,
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and we may be using file system specific code to fill in something
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other than a dev_t for the device */
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uint64_t devid;
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uint64_t inode;
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};
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struct byte_range_lock {
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struct files_struct *fsp;
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unsigned int num_locks;
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BOOL modified;
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BOOL read_only;
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struct file_id key;
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struct lock_struct *lock_data;
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struct db_record *record;
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};
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#define BRLOCK_FN_CAST() \
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void (*)(struct file_id id, struct server_id pid, \
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enum brl_type lock_type, \
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enum brl_flavour lock_flav, \
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br_off start, br_off size)
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#define BRLOCK_FN(fn) \
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void (*fn)(struct file_id id, struct server_id pid, \
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enum brl_type lock_type, \
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enum brl_flavour lock_flav, \
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br_off start, br_off size)
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/* Internal structure in brlock.tdb.
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The data in brlock records is an unsorted linear array of these
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records. It is unnecessary to store the count as tdb provides the
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size of the record */
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struct lock_struct {
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struct lock_context context;
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br_off start;
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br_off size;
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uint16 fnum;
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enum brl_type lock_type;
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enum brl_flavour lock_flav;
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};
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#endif /* _LOCKING_H_ */
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