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e4675ce8db
This extends the file_id struct to add an additional generic uint64_t field: extid. For backwards compatibility with dev/inodes stored in xattr_tdbs and acl_tdbs, the ext id is ignored for these databases. This patch should cause no functional change on systems that don't use SMB_VFS_FILE_ID_CREATE to set the extid. Existing code that uses the smb_share_mode library will need to be updated to be compatibile with the new extid.
100 lines
3.0 KiB
C
100 lines
3.0 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 3 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, see <http://www.gnu.org/licenses/>.
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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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uint64_t extid; /* Support systems that use an extended id (e.g. snapshots). */
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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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/* 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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/****************************************************************************
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This is the structure to queue to implement blocking locks.
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*****************************************************************************/
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struct blocking_lock_record {
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struct blocking_lock_record *next;
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struct blocking_lock_record *prev;
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struct files_struct *fsp;
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struct timeval expire_time;
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int lock_num;
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uint64_t offset;
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uint64_t count;
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uint32_t lock_pid;
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uint32_t blocking_pid; /* PID that blocks us. */
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enum brl_flavour lock_flav;
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enum brl_type lock_type;
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struct smb_request *req;
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void *blr_private; /* Implementation specific. */
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};
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#endif /* _LOCKING_H_ */
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