forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
331 lines
10 KiB
331 lines
10 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
|
/* |
|
* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. |
|
* Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. |
|
*/ |
|
|
|
#ifndef __GLOCK_DOT_H__ |
|
#define __GLOCK_DOT_H__ |
|
|
|
#include <linux/sched.h> |
|
#include <linux/parser.h> |
|
#include "incore.h" |
|
#include "util.h" |
|
|
|
/* Options for hostdata parser */ |
|
|
|
enum { |
|
Opt_jid, |
|
Opt_id, |
|
Opt_first, |
|
Opt_nodir, |
|
Opt_err, |
|
}; |
|
|
|
/* |
|
* lm_lockname types |
|
*/ |
|
|
|
#define LM_TYPE_RESERVED 0x00 |
|
#define LM_TYPE_NONDISK 0x01 |
|
#define LM_TYPE_INODE 0x02 |
|
#define LM_TYPE_RGRP 0x03 |
|
#define LM_TYPE_META 0x04 |
|
#define LM_TYPE_IOPEN 0x05 |
|
#define LM_TYPE_FLOCK 0x06 |
|
#define LM_TYPE_PLOCK 0x07 |
|
#define LM_TYPE_QUOTA 0x08 |
|
#define LM_TYPE_JOURNAL 0x09 |
|
|
|
/* |
|
* lm_lock() states |
|
* |
|
* SHARED is compatible with SHARED, not with DEFERRED or EX. |
|
* DEFERRED is compatible with DEFERRED, not with SHARED or EX. |
|
*/ |
|
|
|
#define LM_ST_UNLOCKED 0 |
|
#define LM_ST_EXCLUSIVE 1 |
|
#define LM_ST_DEFERRED 2 |
|
#define LM_ST_SHARED 3 |
|
|
|
/* |
|
* lm_lock() flags |
|
* |
|
* LM_FLAG_TRY |
|
* Don't wait to acquire the lock if it can't be granted immediately. |
|
* |
|
* LM_FLAG_TRY_1CB |
|
* Send one blocking callback if TRY is set and the lock is not granted. |
|
* |
|
* LM_FLAG_NOEXP |
|
* GFS sets this flag on lock requests it makes while doing journal recovery. |
|
* These special requests should not be blocked due to the recovery like |
|
* ordinary locks would be. |
|
* |
|
* LM_FLAG_ANY |
|
* A SHARED request may also be granted in DEFERRED, or a DEFERRED request may |
|
* also be granted in SHARED. The preferred state is whichever is compatible |
|
* with other granted locks, or the specified state if no other locks exist. |
|
* |
|
* LM_FLAG_PRIORITY |
|
* Override fairness considerations. Suppose a lock is held in a shared state |
|
* and there is a pending request for the deferred state. A shared lock |
|
* request with the priority flag would be allowed to bypass the deferred |
|
* request and directly join the other shared lock. A shared lock request |
|
* without the priority flag might be forced to wait until the deferred |
|
* requested had acquired and released the lock. |
|
* |
|
* LM_FLAG_NODE_SCOPE |
|
* This holder agrees to share the lock within this node. In other words, |
|
* the glock is held in EX mode according to DLM, but local holders on the |
|
* same node can share it. |
|
*/ |
|
|
|
#define LM_FLAG_TRY 0x0001 |
|
#define LM_FLAG_TRY_1CB 0x0002 |
|
#define LM_FLAG_NOEXP 0x0004 |
|
#define LM_FLAG_ANY 0x0008 |
|
#define LM_FLAG_PRIORITY 0x0010 |
|
#define LM_FLAG_NODE_SCOPE 0x0020 |
|
#define GL_ASYNC 0x0040 |
|
#define GL_EXACT 0x0080 |
|
#define GL_SKIP 0x0100 |
|
#define GL_NOCACHE 0x0400 |
|
|
|
/* |
|
* lm_async_cb return flags |
|
* |
|
* LM_OUT_ST_MASK |
|
* Masks the lower two bits of lock state in the returned value. |
|
* |
|
* LM_OUT_CANCELED |
|
* The lock request was canceled. |
|
* |
|
*/ |
|
|
|
#define LM_OUT_ST_MASK 0x00000003 |
|
#define LM_OUT_CANCELED 0x00000008 |
|
#define LM_OUT_ERROR 0x00000004 |
|
|
|
/* |
|
* lm_recovery_done() messages |
|
*/ |
|
|
|
#define LM_RD_GAVEUP 308 |
|
#define LM_RD_SUCCESS 309 |
|
|
|
#define GLR_TRYFAILED 13 |
|
|
|
#define GL_GLOCK_MAX_HOLD (long)(HZ / 5) |
|
#define GL_GLOCK_DFT_HOLD (long)(HZ / 5) |
|
#define GL_GLOCK_MIN_HOLD (long)(10) |
|
#define GL_GLOCK_HOLD_INCR (long)(HZ / 20) |
|
#define GL_GLOCK_HOLD_DECR (long)(HZ / 40) |
|
|
|
struct lm_lockops { |
|
const char *lm_proto_name; |
|
int (*lm_mount) (struct gfs2_sbd *sdp, const char *table); |
|
void (*lm_first_done) (struct gfs2_sbd *sdp); |
|
void (*lm_recovery_result) (struct gfs2_sbd *sdp, unsigned int jid, |
|
unsigned int result); |
|
void (*lm_unmount) (struct gfs2_sbd *sdp); |
|
void (*lm_withdraw) (struct gfs2_sbd *sdp); |
|
void (*lm_put_lock) (struct gfs2_glock *gl); |
|
int (*lm_lock) (struct gfs2_glock *gl, unsigned int req_state, |
|
unsigned int flags); |
|
void (*lm_cancel) (struct gfs2_glock *gl); |
|
const match_table_t *lm_tokens; |
|
}; |
|
|
|
extern struct workqueue_struct *gfs2_delete_workqueue; |
|
static inline struct gfs2_holder *gfs2_glock_is_locked_by_me(struct gfs2_glock *gl) |
|
{ |
|
struct gfs2_holder *gh; |
|
struct pid *pid; |
|
|
|
/* Look in glock's list of holders for one with current task as owner */ |
|
spin_lock(&gl->gl_lockref.lock); |
|
pid = task_pid(current); |
|
list_for_each_entry(gh, &gl->gl_holders, gh_list) { |
|
if (!test_bit(HIF_HOLDER, &gh->gh_iflags)) |
|
break; |
|
if (gh->gh_owner_pid == pid) |
|
goto out; |
|
} |
|
gh = NULL; |
|
out: |
|
spin_unlock(&gl->gl_lockref.lock); |
|
|
|
return gh; |
|
} |
|
|
|
static inline int gfs2_glock_is_held_excl(struct gfs2_glock *gl) |
|
{ |
|
return gl->gl_state == LM_ST_EXCLUSIVE; |
|
} |
|
|
|
static inline int gfs2_glock_is_held_dfrd(struct gfs2_glock *gl) |
|
{ |
|
return gl->gl_state == LM_ST_DEFERRED; |
|
} |
|
|
|
static inline int gfs2_glock_is_held_shrd(struct gfs2_glock *gl) |
|
{ |
|
return gl->gl_state == LM_ST_SHARED; |
|
} |
|
|
|
static inline struct address_space *gfs2_glock2aspace(struct gfs2_glock *gl) |
|
{ |
|
if (gl->gl_ops->go_flags & GLOF_ASPACE) |
|
return (struct address_space *)(gl + 1); |
|
return NULL; |
|
} |
|
|
|
extern int gfs2_glock_get(struct gfs2_sbd *sdp, u64 number, |
|
const struct gfs2_glock_operations *glops, |
|
int create, struct gfs2_glock **glp); |
|
extern void gfs2_glock_hold(struct gfs2_glock *gl); |
|
extern void gfs2_glock_put(struct gfs2_glock *gl); |
|
extern void gfs2_glock_queue_put(struct gfs2_glock *gl); |
|
extern void gfs2_holder_init(struct gfs2_glock *gl, unsigned int state, |
|
u16 flags, struct gfs2_holder *gh); |
|
extern void gfs2_holder_reinit(unsigned int state, u16 flags, |
|
struct gfs2_holder *gh); |
|
extern void gfs2_holder_uninit(struct gfs2_holder *gh); |
|
extern int gfs2_glock_nq(struct gfs2_holder *gh); |
|
extern int gfs2_glock_poll(struct gfs2_holder *gh); |
|
extern int gfs2_glock_wait(struct gfs2_holder *gh); |
|
extern int gfs2_glock_async_wait(unsigned int num_gh, struct gfs2_holder *ghs); |
|
extern void gfs2_glock_dq(struct gfs2_holder *gh); |
|
extern void gfs2_glock_dq_wait(struct gfs2_holder *gh); |
|
extern void gfs2_glock_dq_uninit(struct gfs2_holder *gh); |
|
extern int gfs2_glock_nq_num(struct gfs2_sbd *sdp, u64 number, |
|
const struct gfs2_glock_operations *glops, |
|
unsigned int state, u16 flags, |
|
struct gfs2_holder *gh); |
|
extern int gfs2_glock_nq_m(unsigned int num_gh, struct gfs2_holder *ghs); |
|
extern void gfs2_glock_dq_m(unsigned int num_gh, struct gfs2_holder *ghs); |
|
extern void gfs2_dump_glock(struct seq_file *seq, struct gfs2_glock *gl, |
|
bool fsid); |
|
#define GLOCK_BUG_ON(gl,x) do { if (unlikely(x)) { \ |
|
gfs2_dump_glock(NULL, gl, true); \ |
|
BUG(); } } while(0) |
|
#define gfs2_glock_assert_warn(gl, x) do { if (unlikely(!(x))) { \ |
|
gfs2_dump_glock(NULL, gl, true); \ |
|
gfs2_assert_warn((gl)->gl_name.ln_sbd, (x)); } } \ |
|
while (0) |
|
#define gfs2_glock_assert_withdraw(gl, x) do { if (unlikely(!(x))) { \ |
|
gfs2_dump_glock(NULL, gl, true); \ |
|
gfs2_assert_withdraw((gl)->gl_name.ln_sbd, (x)); } } \ |
|
while (0) |
|
|
|
extern __printf(2, 3) |
|
void gfs2_print_dbg(struct seq_file *seq, const char *fmt, ...); |
|
|
|
/** |
|
* gfs2_glock_nq_init - initialize a holder and enqueue it on a glock |
|
* @gl: the glock |
|
* @state: the state we're requesting |
|
* @flags: the modifier flags |
|
* @gh: the holder structure |
|
* |
|
* Returns: 0, GLR_*, or errno |
|
*/ |
|
|
|
static inline int gfs2_glock_nq_init(struct gfs2_glock *gl, |
|
unsigned int state, u16 flags, |
|
struct gfs2_holder *gh) |
|
{ |
|
int error; |
|
|
|
gfs2_holder_init(gl, state, flags, gh); |
|
|
|
error = gfs2_glock_nq(gh); |
|
if (error) |
|
gfs2_holder_uninit(gh); |
|
|
|
return error; |
|
} |
|
|
|
extern void gfs2_glock_cb(struct gfs2_glock *gl, unsigned int state); |
|
extern void gfs2_glock_complete(struct gfs2_glock *gl, int ret); |
|
extern bool gfs2_queue_delete_work(struct gfs2_glock *gl, unsigned long delay); |
|
extern void gfs2_cancel_delete_work(struct gfs2_glock *gl); |
|
extern bool gfs2_delete_work_queued(const struct gfs2_glock *gl); |
|
extern void gfs2_flush_delete_work(struct gfs2_sbd *sdp); |
|
extern void gfs2_gl_hash_clear(struct gfs2_sbd *sdp); |
|
extern void gfs2_glock_finish_truncate(struct gfs2_inode *ip); |
|
extern void gfs2_glock_thaw(struct gfs2_sbd *sdp); |
|
extern void gfs2_glock_add_to_lru(struct gfs2_glock *gl); |
|
extern void gfs2_glock_free(struct gfs2_glock *gl); |
|
|
|
extern int __init gfs2_glock_init(void); |
|
extern void gfs2_glock_exit(void); |
|
|
|
extern void gfs2_create_debugfs_file(struct gfs2_sbd *sdp); |
|
extern void gfs2_delete_debugfs_file(struct gfs2_sbd *sdp); |
|
extern void gfs2_register_debugfs(void); |
|
extern void gfs2_unregister_debugfs(void); |
|
|
|
extern const struct lm_lockops gfs2_dlm_ops; |
|
|
|
static inline void gfs2_holder_mark_uninitialized(struct gfs2_holder *gh) |
|
{ |
|
gh->gh_gl = NULL; |
|
} |
|
|
|
static inline bool gfs2_holder_initialized(struct gfs2_holder *gh) |
|
{ |
|
return gh->gh_gl; |
|
} |
|
|
|
static inline bool gfs2_holder_queued(struct gfs2_holder *gh) |
|
{ |
|
return !list_empty(&gh->gh_list); |
|
} |
|
|
|
/** |
|
* glock_set_object - set the gl_object field of a glock |
|
* @gl: the glock |
|
* @object: the object |
|
*/ |
|
static inline void glock_set_object(struct gfs2_glock *gl, void *object) |
|
{ |
|
spin_lock(&gl->gl_lockref.lock); |
|
if (gfs2_assert_warn(gl->gl_name.ln_sbd, gl->gl_object == NULL)) |
|
gfs2_dump_glock(NULL, gl, true); |
|
gl->gl_object = object; |
|
spin_unlock(&gl->gl_lockref.lock); |
|
} |
|
|
|
/** |
|
* glock_clear_object - clear the gl_object field of a glock |
|
* @gl: the glock |
|
* @object: the object |
|
* |
|
* I'd love to similarly add this: |
|
* else if (gfs2_assert_warn(gl->gl_sbd, gl->gl_object == object)) |
|
* gfs2_dump_glock(NULL, gl, true); |
|
* Unfortunately, that's not possible because as soon as gfs2_delete_inode |
|
* frees the block in the rgrp, another process can reassign it for an I_NEW |
|
* inode in gfs2_create_inode because that calls new_inode, not gfs2_iget. |
|
* That means gfs2_delete_inode may subsequently try to call this function |
|
* for a glock that's already pointing to a brand new inode. If we clear the |
|
* new inode's gl_object, we'll introduce metadata corruption. Function |
|
* gfs2_delete_inode calls clear_inode which calls gfs2_clear_inode which also |
|
* tries to clear gl_object, so it's more than just gfs2_delete_inode. |
|
* |
|
*/ |
|
static inline void glock_clear_object(struct gfs2_glock *gl, void *object) |
|
{ |
|
spin_lock(&gl->gl_lockref.lock); |
|
if (gl->gl_object == object) |
|
gl->gl_object = NULL; |
|
spin_unlock(&gl->gl_lockref.lock); |
|
} |
|
|
|
extern void gfs2_inode_remember_delete(struct gfs2_glock *gl, u64 generation); |
|
extern bool gfs2_inode_already_deleted(struct gfs2_glock *gl, u64 generation); |
|
|
|
#endif /* __GLOCK_DOT_H__ */
|
|
|