diff options
| -rw-r--r-- | fs/gfs2/locking/dlm/Makefile | 3 | ||||
| -rw-r--r-- | fs/gfs2/locking/dlm/lock.c | 537 | ||||
| -rw-r--r-- | fs/gfs2/locking/dlm/main.c | 58 | ||||
| -rw-r--r-- | fs/gfs2/locking/dlm/mount.c | 240 | ||||
| -rw-r--r-- | fs/gfs2/locking/dlm/sysfs.c | 315 | ||||
| -rw-r--r-- | fs/gfs2/locking/dlm/thread.c | 359 | ||||
| -rw-r--r-- | fs/gfs2/locking/nolock/Makefile | 3 | ||||
| -rw-r--r-- | fs/gfs2/locking/nolock/lock_nolock.mod.c | 44 | ||||
| -rw-r--r-- | fs/gfs2/locking/nolock/main.c | 357 |
9 files changed, 1916 insertions, 0 deletions
diff --git a/fs/gfs2/locking/dlm/Makefile b/fs/gfs2/locking/dlm/Makefile new file mode 100644 index 00000000000..d3bca02f7b3 --- /dev/null +++ b/fs/gfs2/locking/dlm/Makefile @@ -0,0 +1,3 @@ +obj-$(CONFIG_GFS2_FS) += lock_dlm.o +lock_dlm-y := lock.o main.o mount.o sysfs.o thread.o + diff --git a/fs/gfs2/locking/dlm/lock.c b/fs/gfs2/locking/dlm/lock.c new file mode 100644 index 00000000000..daf59d504e2 --- /dev/null +++ b/fs/gfs2/locking/dlm/lock.c @@ -0,0 +1,537 @@ +/****************************************************************************** +******************************************************************************* +** +** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. +** Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved. +** +** This copyrighted material is made available to anyone wishing to use, +** modify, copy, or redistribute it subject to the terms and conditions +** of the GNU General Public License v.2. +** +******************************************************************************* +******************************************************************************/ + +#include "lock_dlm.h" + +static char junk_lvb[GDLM_LVB_SIZE]; + +static void queue_complete(struct gdlm_lock *lp) +{ + struct gdlm_ls *ls = lp->ls; + + clear_bit(LFL_ACTIVE, &lp->flags); + + spin_lock(&ls->async_lock); + list_add_tail(&lp->clist, &ls->complete); + spin_unlock(&ls->async_lock); + wake_up(&ls->thread_wait); +} + +static inline void gdlm_ast(void *astarg) +{ + queue_complete((struct gdlm_lock *) astarg); +} + +static inline void gdlm_bast(void *astarg, int mode) +{ + struct gdlm_lock *lp = astarg; + struct gdlm_ls *ls = lp->ls; + + if (!mode) { + printk("lock_dlm: bast mode zero %x,%"PRIx64"\n", + lp->lockname.ln_type, lp->lockname.ln_number); + return; + } + + spin_lock(&ls->async_lock); + if (!lp->bast_mode) { + list_add_tail(&lp->blist, &ls->blocking); + lp->bast_mode = mode; + } else if (lp->bast_mode < mode) + lp->bast_mode = mode; + spin_unlock(&ls->async_lock); + wake_up(&ls->thread_wait); +} + +void gdlm_queue_delayed(struct gdlm_lock *lp) +{ + struct gdlm_ls *ls = lp->ls; + + spin_lock(&ls->async_lock); + list_add_tail(&lp->delay_list, &ls->delayed); + spin_unlock(&ls->async_lock); +} + +/* convert gfs lock-state to dlm lock-mode */ + +static int16_t make_mode(int16_t lmstate) +{ + switch (lmstate) { + case LM_ST_UNLOCKED: + return DLM_LOCK_NL; + case LM_ST_EXCLUSIVE: + return DLM_LOCK_EX; + case LM_ST_DEFERRED: + return DLM_LOCK_CW; + case LM_ST_SHARED: + return DLM_LOCK_PR; + default: + GDLM_ASSERT(0, printk("unknown LM state %d\n", lmstate);); + } +} + +/* convert dlm lock-mode to gfs lock-state */ + +int16_t gdlm_make_lmstate(int16_t dlmmode) +{ + switch (dlmmode) { + case DLM_LOCK_IV: + case DLM_LOCK_NL: + return LM_ST_UNLOCKED; + case DLM_LOCK_EX: + return LM_ST_EXCLUSIVE; + case DLM_LOCK_CW: + return LM_ST_DEFERRED; + case DLM_LOCK_PR: + return LM_ST_SHARED; + default: + GDLM_ASSERT(0, printk("unknown DLM mode %d\n", dlmmode);); + } +} + +/* verify agreement with GFS on the current lock state, NB: DLM_LOCK_NL and + DLM_LOCK_IV are both considered LM_ST_UNLOCKED by GFS. */ + +static void check_cur_state(struct gdlm_lock *lp, unsigned int cur_state) +{ + int16_t cur = make_mode(cur_state); + if (lp->cur != DLM_LOCK_IV) + GDLM_ASSERT(lp->cur == cur, printk("%d, %d\n", lp->cur, cur);); +} + +static inline unsigned int make_flags(struct gdlm_lock *lp, + unsigned int gfs_flags, + int16_t cur, int16_t req) +{ + unsigned int lkf = 0; + + if (gfs_flags & LM_FLAG_TRY) + lkf |= DLM_LKF_NOQUEUE; + + if (gfs_flags & LM_FLAG_TRY_1CB) { + lkf |= DLM_LKF_NOQUEUE; + lkf |= DLM_LKF_NOQUEUEBAST; + } + + if (gfs_flags & LM_FLAG_PRIORITY) { + lkf |= DLM_LKF_NOORDER; + lkf |= DLM_LKF_HEADQUE; + } + + if (gfs_flags & LM_FLAG_ANY) { + if (req == DLM_LOCK_PR) + lkf |= DLM_LKF_ALTCW; + else if (req == DLM_LOCK_CW) + lkf |= DLM_LKF_ALTPR; + } + + if (lp->lksb.sb_lkid != 0) { + lkf |= DLM_LKF_CONVERT; + + /* Conversion deadlock avoidance by DLM */ + + if (!test_bit(LFL_FORCE_PROMOTE, &lp->flags) && + !(lkf & DLM_LKF_NOQUEUE) && + cur > DLM_LOCK_NL && req > DLM_LOCK_NL && cur != req) + lkf |= DLM_LKF_CONVDEADLK; + } + + if (lp->lvb) + lkf |= DLM_LKF_VALBLK; + + return lkf; +} + +/* make_strname - convert GFS lock numbers to a string */ + +static inline void make_strname(struct lm_lockname *lockname, + struct gdlm_strname *str) +{ + sprintf(str->name, "%8x%16"PRIx64, lockname->ln_type, + lockname->ln_number); + str->namelen = GDLM_STRNAME_BYTES; +} + +int gdlm_create_lp(struct gdlm_ls *ls, struct lm_lockname *name, + struct gdlm_lock **lpp) +{ + struct gdlm_lock *lp; + + lp = kmalloc(sizeof(struct gdlm_lock), GFP_KERNEL); + if (!lp) + return -ENOMEM; + + memset(lp, 0, sizeof(struct gdlm_lock)); + lp->lockname = *name; + lp->ls = ls; + lp->cur = DLM_LOCK_IV; + lp->lvb = NULL; + lp->hold_null = NULL; + init_completion(&lp->ast_wait); + INIT_LIST_HEAD(&lp->clist); + INIT_LIST_HEAD(&lp->blist); + INIT_LIST_HEAD(&lp->delay_list); + + spin_lock(&ls->async_lock); + list_add(&lp->all_list, &ls->all_locks); + ls->all_locks_count++; + spin_unlock(&ls->async_lock); + + *lpp = lp; + return 0; +} + +void gdlm_delete_lp(struct gdlm_lock *lp) +{ + struct gdlm_ls *ls = lp->ls; + + spin_lock(&ls->async_lock); + if (!list_empty(&lp->clist)) + list_del_init(&lp->clist); + if (!list_empty(&lp->blist)) + list_del_init(&lp->blist); + if (!list_empty(&lp->delay_list)) + list_del_init(&lp->delay_list); + GDLM_ASSERT(!list_empty(&lp->all_list),); + list_del_init(&lp->all_list); + ls->all_locks_count--; + spin_unlock(&ls->async_lock); + + kfree(lp); +} + +int gdlm_get_lock(lm_lockspace_t *lockspace, struct lm_lockname *name, + lm_lock_t **lockp) +{ + struct gdlm_lock *lp; + int error; + + error = gdlm_create_lp((struct gdlm_ls *) lockspace, name, &lp); + + *lockp = (lm_lock_t *) lp; + return error; +} + +void gdlm_put_lock(lm_lock_t *lock) +{ + gdlm_delete_lp((struct gdlm_lock *) lock); +} + +void gdlm_do_lock(struct gdlm_lock *lp, struct dlm_range *range) +{ + struct gdlm_ls *ls = lp->ls; + struct gdlm_strname str; + int error, bast = 1; + + /* + * When recovery is in progress, delay lock requests for submission + * once recovery is done. Requests for recovery (NOEXP) and unlocks + * can pass. + */ + + if (test_bit(DFL_BLOCK_LOCKS, &ls->flags) && + !test_bit(LFL_NOBLOCK, &lp->flags) && lp->req != DLM_LOCK_NL) { + gdlm_queue_delayed(lp); + return; + } + + /* + * Submit the actual lock request. + */ + + if (test_bit(LFL_NOBAST, &lp->flags)) + bast = 0; + + make_strname(&lp->lockname, &str); + + set_bit(LFL_ACTIVE, &lp->flags); + + log_debug("lk %x,%"PRIx64" id %x %d,%d %x", lp->lockname.ln_type, + lp->lockname.ln_number, lp->lksb.sb_lkid, + lp->cur, lp->req, lp->lkf); + + error = dlm_lock(ls->dlm_lockspace, lp->req, &lp->lksb, lp->lkf, + str.name, str.namelen, 0, gdlm_ast, (void *) lp, + bast ? gdlm_bast : NULL, range); + + if ((error == -EAGAIN) && (lp->lkf & DLM_LKF_NOQUEUE)) { + lp->lksb.sb_status = -EAGAIN; + queue_complete(lp); + error = 0; + } + + GDLM_ASSERT(!error, + printk("%s: num=%x,%"PRIx64" err=%d cur=%d req=%d lkf=%x\n", + ls->fsname, lp->lockname.ln_type, + lp->lockname.ln_number, error, lp->cur, lp->req, + lp->lkf);); +} + +void gdlm_do_unlock(struct gdlm_lock *lp) +{ + unsigned int lkf = 0; + int error; + + set_bit(LFL_DLM_UNLOCK, &lp->flags); + set_bit(LFL_ACTIVE, &lp->flags); + + if (lp->lvb) + lkf = DLM_LKF_VALBLK; + + log_debug("un %x,%"PRIx64" %x %d %x", lp->lockname.ln_type, + lp->lockname.ln_number, lp->lksb.sb_lkid, lp->cur, lkf); + + error = dlm_unlock(lp->ls->dlm_lockspace, lp->lksb.sb_lkid, lkf, + NULL, lp); + + GDLM_ASSERT(!error, + printk("%s: error=%d num=%x,%"PRIx64" lkf=%x flags=%lx\n", + lp->ls->fsname, error, lp->lockname.ln_type, + lp->lockname.ln_number, lkf, lp->flags);); +} + +unsigned int gdlm_lock(lm_lock_t *lock, unsigned int cur_state, + unsigned int req_state, unsigned int flags) +{ + struct gdlm_lock *lp = (struct gdlm_lock *) lock; + + clear_bit(LFL_DLM_CANCEL, &lp->flags); + if (flags & LM_FLAG_NOEXP) + set_bit(LFL_NOBLOCK, &lp->flags); + + check_cur_state(lp, cur_state); + lp->req = make_mode(req_state); + lp->lkf = make_flags(lp, flags, lp->cur, lp->req); + + gdlm_do_lock(lp, NULL); + return LM_OUT_ASYNC; +} + +unsigned int gdlm_unlock(lm_lock_t *lock, unsigned int cur_state) +{ + struct gdlm_lock *lp = (struct gdlm_lock *) lock; + + clear_bit(LFL_DLM_CANCEL, &lp->flags); + if (lp->cur == DLM_LOCK_IV) + return 0; + gdlm_do_unlock(lp); + return LM_OUT_ASYNC; +} + +void gdlm_cancel(lm_lock_t *lock) +{ + struct gdlm_lock *lp = (struct gdlm_lock *) lock; + struct gdlm_ls *ls = lp->ls; + int error, delay_list = 0; + + if (test_bit(LFL_DLM_CANCEL, &lp->flags)) + return; + + log_all("gdlm_cancel %x,%"PRIx64" flags %lx", + lp->lockname.ln_type, lp->lockname.ln_number, lp->flags); + + spin_lock(&ls->async_lock); + if (!list_empty(&lp->delay_list)) { + list_del_init(&lp->delay_list); + delay_list = 1; + } + spin_unlock(&ls->async_lock); + + if (delay_list) { + set_bit(LFL_CANCEL, &lp->flags); + set_bit(LFL_ACTIVE, &lp->flags); + queue_complete(lp); + return; + } + + if (!test_bit(LFL_ACTIVE, &lp->flags) || + test_bit(LFL_DLM_UNLOCK, &lp->flags)) { + log_all("gdlm_cancel skip %x,%"PRIx64" flags %lx", + lp->lockname.ln_type, lp->lockname.ln_number, + lp->flags); + return; + } + + /* the lock is blocked in the dlm */ + + set_bit(LFL_DLM_CANCEL, &lp->flags); + set_bit(LFL_ACTIVE, &lp->flags); + + error = dlm_unlock(ls->dlm_lockspace, lp->lksb.sb_lkid, DLM_LKF_CANCEL, + NULL, lp); + + log_all("gdlm_cancel rv %d %x,%"PRIx64" flags %lx", error, + lp->lockname.ln_type, lp->lockname.ln_number, lp->flags); + + if (error == -EBUSY) + clear_bit(LFL_DLM_CANCEL, &lp->flags); +} + +int gdlm_add_lvb(struct gdlm_lock *lp) +{ + char *lvb; + + lvb = kmalloc(GDLM_LVB_SIZE, GFP_KERNEL); + if (!lvb) + return -ENOMEM; + + memset(lvb, 0, GDLM_LVB_SIZE); + + lp->lksb.sb_lvbptr = lvb; + lp->lvb = lvb; + return 0; +} + +void gdlm_del_lvb(struct gdlm_lock *lp) +{ + kfree(lp->lvb); + lp->lvb = NULL; + lp->lksb.sb_lvbptr = NULL; +} + +/* This can do a synchronous dlm request (requiring a lock_dlm thread to get + the completion) because gfs won't call hold_lvb() during a callback (from + the context of a lock_dlm thread). */ + +static int hold_null_lock(struct gdlm_lock *lp) +{ + struct gdlm_lock *lpn = NULL; + int error; + + if (lp->hold_null) { + printk("lock_dlm: lvb already held\n"); + return 0; + } + + error = gdlm_create_lp(lp->ls, &lp->lockname, &lpn); + if (error) + goto out; + + lpn->lksb.sb_lvbptr = junk_lvb; + lpn->lvb = junk_lvb; + + lpn->req = DLM_LOCK_NL; + lpn->lkf = DLM_LKF_VALBLK | DLM_LKF_EXPEDITE; + set_bit(LFL_NOBAST, &lpn->flags); + set_bit(LFL_INLOCK, &lpn->flags); + + init_completion(&lpn->ast_wait); + gdlm_do_lock(lpn, NULL); + wait_for_completion(&lpn->ast_wait); + error = lp->lksb.sb_status; + if (error) { + printk("lock_dlm: hold_null_lock dlm error %d\n", error); + gdlm_delete_lp(lpn); + lpn = NULL; + } + out: + lp->hold_null = lpn; + return error; +} + +/* This cannot do a synchronous dlm request (requiring a lock_dlm thread to get + the completion) because gfs may call unhold_lvb() during a callback (from + the context of a lock_dlm thread) which could cause a deadlock since the + other lock_dlm thread could be engaged in recovery. */ + +static void unhold_null_lock(struct gdlm_lock *lp) +{ + struct gdlm_lock *lpn = lp->hold_null; + + GDLM_ASSERT(lpn,); + lpn->lksb.sb_lvbptr = NULL; + lpn->lvb = NULL; + set_bit(LFL_UNLOCK_DELETE, &lpn->flags); + gdlm_do_unlock(lpn); + lp->hold_null = NULL; +} + +/* Acquire a NL lock because gfs requires the value block to remain + intact on the resource while the lvb is "held" even if it's holding no locks + on the resource. */ + +int gdlm_hold_lvb(lm_lock_t *lock, char **lvbp) +{ + struct gdlm_lock *lp = (struct gdlm_lock *) lock; + int error; + + error = gdlm_add_lvb(lp); + if (error) + return error; + + *lvbp = lp->lvb; + + error = hold_null_lock(lp); + if (error) + gdlm_del_lvb(lp); + + return error; +} + +void gdlm_unhold_lvb(lm_lock_t *lock, char *lvb) +{ + struct gdlm_lock *lp = (struct gdlm_lock *) lock; + + unhold_null_lock(lp); + gdlm_del_lvb(lp); +} + +void gdlm_sync_lvb(lm_lock_t *lock, char *lvb) +{ + struct gdlm_lock *lp = (struct gdlm_lock *) lock; + + if (lp->cur != DLM_LOCK_EX) + return; + + init_completion(&lp->ast_wait); + set_bit(LFL_SYNC_LVB, &lp->flags); + + lp->req = DLM_LOCK_EX; + lp->lkf = make_flags(lp, 0, lp->cur, lp->req); + + gdlm_do_lock(lp, NULL); + wait_for_completion(&lp->ast_wait); +} + +void gdlm_submit_delayed(struct gdlm_ls *ls) +{ + struct gdlm_lock *lp, *safe; + + spin_lock(&ls->async_lock); + list_for_each_entry_safe(lp, safe, &ls->delayed, delay_list) { + list_del_init(&lp->delay_list); + list_add_tail(&lp->delay_list, &ls->submit); + } + spin_unlock(&ls->async_lock); + wake_up(&ls->thread_wait); +} + +int gdlm_release_all_locks(struct gdlm_ls *ls) +{ + struct gdlm_lock *lp, *safe; + int count = 0; + + spin_lock(&ls->async_lock); + list_for_each_entry_safe(lp, safe, &ls->all_locks, all_list) { + list_del_init(&lp->all_list); + + if (lp->lvb && lp->lvb != junk_lvb) + kfree(lp->lvb); + kfree(lp); + count++; + } + spin_unlock(&ls->async_lock); + + return count; +} + diff --git a/fs/gfs2/locking/dlm/main.c b/fs/gfs2/locking/dlm/main.c new file mode 100644 index 00000000000..3ced92ef1b1 --- /dev/null +++ b/fs/gfs2/locking/dlm/main.c @@ -0,0 +1,58 @@ +/****************************************************************************** +******************************************************************************* +** +** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. +** Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved. +** +** This copyrighted material is made available to anyone wishing to use, +** modify, copy, or redistribute it subject to the terms and conditions +** of the GNU General Public License v.2. +** +******************************************************************************* +******************************************************************************/ + +#include <linux/init.h> + +#include "lock_dlm.h" + +extern int gdlm_drop_count; +extern int gdlm_drop_period; + +extern struct lm_lockops gdlm_ops; + +int __init init_lock_dlm(void) +{ + int error; + + error = lm_register_proto(&gdlm_ops); + if (error) { + printk("lock_dlm: can't register protocol: %d\n", error); + return error; + } + + error = gdlm_sysfs_init(); + if (error) { + lm_unregister_proto(&gdlm_ops); + return error; + } + + gdlm_drop_count = GDLM_DROP_COUNT; + gdlm_drop_period = GDLM_DROP_PERIOD; + + printk("Lock_DLM (built %s %s) installed\n", __DATE__, __TIME__); + return 0; +} + +void __exit exit_lock_dlm(void) +{ + lm_unregister_proto(&gdlm_ops); + gdlm_sysfs_exit(); +} + +module_init(init_lock_dlm); +module_exit(exit_lock_dlm); + +MODULE_DESCRIPTION("GFS DLM Locking Module"); +MODULE_AUTHOR("Red Hat, Inc."); +MODULE_LICENSE("GPL"); + diff --git a/fs/gfs2/locking/dlm/mount.c b/fs/gfs2/locking/dlm/mount.c new file mode 100644 index 00000000000..92b1789deb8 --- /dev/null +++ b/fs/gfs2/locking/dlm/mount.c @@ -0,0 +1,240 @@ +/****************************************************************************** +******************************************************************************* +** +** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. +** Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved. +** +** This copyrighted material is made available to anyone wishing to use, +** modify, copy, or redistribute it subject to the terms and conditions +** of the GNU General Public License v.2. +** +******************************************************************************* +******************************************************************************/ + +#include "lock_dlm.h" + +int gdlm_drop_count; +int gdlm_drop_period; +struct lm_lockops gdlm_ops; + + +static struct gdlm_ls *init_gdlm(lm_callback_t cb, lm_fsdata_t *fsdata, + int flags, char *table_name) +{ + struct gdlm_ls *ls; + char buf[256], *p; + + ls = kmalloc(sizeof(struct gdlm_ls), GFP_KERNEL); + if (!ls) + return NULL; + + memset(ls, 0, sizeof(struct gdlm_ls)); + + ls->drop_locks_count = gdlm_drop_count; + ls->drop_locks_period = gdlm_drop_period; + + ls->fscb = cb; + ls->fsdata = fsdata; + ls->fsflags = flags; + + spin_lock_init(&ls->async_lock); + + INIT_LIST_HEAD(&ls->complete); + INIT_LIST_HEAD(&ls->blocking); + INIT_LIST_HEAD(&ls->delayed); + INIT_LIST_HEAD(&ls->submit); + INIT_LIST_HEAD(&ls->all_locks); + + init_waitqueue_head(&ls->thread_wait); + init_waitqueue_head(&ls->wait_control); + ls->thread1 = NULL; + ls->thread2 = NULL; + ls->drop_time = jiffies; + ls->jid = -1; + + strncpy(buf, table_name, 256); + buf[255] = '\0'; + + p = strstr(buf, ":"); + if (!p) { + printk("lock_dlm: invalid table_name \"%s\"\n", table_name); + kfree(ls); + return NULL; + } + *p = '\0'; + p++; + + strncpy(ls->clustername, buf, 128); + strncpy(ls->fsname, p, 128); + + return ls; +} + +static int gdlm_mount(char *table_name, char *host_data, + lm_callback_t cb, lm_fsdata_t *fsdata, + unsigned int min_lvb_size, int flags, + struct lm_lockstruct *lockstruct) +{ + struct gdlm_ls *ls; + int error = -ENOMEM; + + if (min_lvb_size > GDLM_LVB_SIZE) + goto out; + + ls = init_gdlm(cb, fsdata, flags, table_name); + if (!ls) + goto out; + + error = gdlm_init_threads(ls); + if (error) + goto out_free; + + error = dlm_new_lockspace(ls->fsname, strlen(ls->fsname), + &ls->dlm_lockspace, 0, GDLM_LVB_SIZE); + if (error) { + printk("lock_dlm: dlm_new_lockspace error %d\n", error); + goto out_thread; + } + + error = gdlm_kobject_setup(ls); + if (error) + goto out_dlm; + kobject_uevent(&ls->kobj, KOBJ_MOUNT, NULL); + + /* Now we depend on userspace to notice the new mount, + join the appropriate group, and do a write to our sysfs + "mounted" or "terminate" file. Before the start, userspace + must set "jid" and "first". */ + + error = wait_event_interruptible(ls->wait_control, + test_bit(DFL_JOIN_DONE, &ls->flags)); + if (error) + goto out_sysfs; + + if (test_bit(DFL_TERMINATE, &ls->flags)) { + error = -ERESTARTSYS; + goto out_sysfs; + } + + lockstruct->ls_jid = ls->jid; + lockstruct->ls_first = ls->first; + lockstruct->ls_lockspace = ls; + lockstruct->ls_ops = &gdlm_ops; + lockstruct->ls_flags = 0; + lockstruct->ls_lvb_size = GDLM_LVB_SIZE; + return 0; + + out_sysfs: + gdlm_kobject_release(ls); + out_dlm: + dlm_release_lockspace(ls->dlm_lockspace, 2); + out_thread: + gdlm_release_threads(ls); + out_free: + kfree(ls); + out: + return error; +} + +static void gdlm_unmount(lm_lockspace_t *lockspace) +{ + struct gdlm_ls *ls = (struct gdlm_ls *) lockspace; + int rv; + + log_debug("unmount flags %lx", ls->flags); + + if (test_bit(DFL_WITHDRAW, &ls->flags)) { + gdlm_kobject_release(ls); + goto out; + } + + kobject_uevent(&ls->kobj, KOBJ_UMOUNT, NULL); + + wait_event_interruptible(ls->wait_control, + test_bit(DFL_LEAVE_DONE, &ls->flags)); + + gdlm_kobject_release(ls); + dlm_release_lockspace(ls->dlm_lockspace, 2); + gdlm_release_threads(ls); + rv = gdlm_release_all_locks(ls); + if (rv) + log_all("lm_dlm_unmount: %d stray locks freed", rv); + out: + kfree(ls); +} + +static void gdlm_recovery_done(lm_lockspace_t *lockspace, unsigned int jid, + unsigned int message) +{ + struct gdlm_ls *ls = (struct gdlm_ls *) lockspace; + ls->recover_done = jid; + kobject_uevent(&ls->kobj, KOBJ_CHANGE, NULL); +} + +static void gdlm_others_may_mount(lm_lockspace_t *lockspace) +{ + struct gdlm_ls *ls = (struct gdlm_ls *) lockspace; + ls->first_done = 1; + kobject_uevent(&ls->kobj, KOBJ_CHANGE, NULL); +} + +static void gdlm_withdraw(lm_lockspace_t *lockspace) +{ + struct gdlm_ls *ls = (struct gdlm_ls *) lockspace; + + /* userspace suspends locking on all other members */ + + kobject_uevent(&ls->kobj, KOBJ_OFFLINE, NULL); + + wait_event_interruptible(ls->wait_control, + test_bit(DFL_WITHDRAW, &ls->flags)); + + dlm_release_lockspace(ls->dlm_lockspace, 2); + gdlm_release_threads(ls); + gdlm_release_all_locks(ls); + + kobject_uevent(&ls->kobj, KOBJ_UMOUNT, NULL); + + /* userspace leaves the mount group, we don't need to wait for + that to complete */ +} + +int gdlm_plock_get(lm_lockspace_t *lockspace, struct lm_lockname *name, + struct file *file, struct file_lock *fl) +{ + return -ENOSYS; +} + +int gdlm_punlock(lm_lockspace_t *lockspace, struct lm_lockname *name, + struct file *file, struct file_lock *fl) +{ + return -ENOSYS; +} + +int gdlm_plock(lm_lockspace_t *lockspace, struct lm_lockname *name, + struct file *file, int cmd, struct file_lock *fl) +{ + return -ENOSYS; +} + +struct lm_lockops gdlm_ops = { + lm_proto_name:"lock_dlm", + lm_mount:gdlm_mount, + lm_others_may_mount:gdlm_others_may_mount, + lm_unmount:gdlm_unmount, + lm_withdraw:gdlm_withdraw, + lm_get_lock:gdlm_get_lock, + lm_put_lock:gdlm_put_lock, + lm_lock:gdlm_lock, + lm_unlock:gdlm_unlock, + lm_plock:gdlm_plock, + lm_punlock:gdlm_punlock, + lm_plock_get:gdlm_plock_get, + lm_cancel:gdlm_cancel, + lm_hold_lvb:gdlm_hold_lvb, + lm_unhold_lvb:gdlm_unhold_lvb, + lm_sync_lvb:gdlm_sync_lvb, + lm_recovery_done:gdlm_recovery_done, + lm_owner:THIS_MODULE, +}; + diff --git a/fs/gfs2/locking/dlm/sysfs.c b/fs/gfs2/locking/dlm/sysfs.c new file mode 100644 index 00000000000..8964733f55e --- /dev/null +++ b/fs/gfs2/locking/dlm/sysfs.c @@ -0,0 +1,315 @@ +/****************************************************************************** +******************************************************************************* +** +** Copyright (C) 2005 Red Hat, Inc. All rights reserved. +** +** This copyrighted material is made available to anyone wishing to use, +** modify, copy, or redistribute it subject to the terms and conditions +** of the GNU General Public License v.2. +** +******************************************************************************* +******************************************************************************/ + +#include <linux/ctype.h> +#include <linux/stat.h> + +#include "lock_dlm.h" + +static ssize_t gdlm_block_show(struct gdlm_ls *ls, char *buf) +{ + ssize_t ret; + int val = 0; + + if (test_bit(DFL_BLOCK_LOCKS, &ls->flags)) + val = 1; + ret = sprintf(buf, "%d\n", val); + return ret; +} + +static ssize_t gdlm_block_store(struct gdlm_ls *ls, const char *buf, size_t len) +{ + ssize_t ret = len; + int val; + + val = simple_strtol(buf, NULL, 0); + + if (val == 1) + set_bit(DFL_BLOCK_LOCKS, &ls->flags); + else if (val == 0) { + clear_bit(DFL_BLOCK_LOCKS, &ls->flags); + gdlm_submit_delayed(ls); + } else + ret = -EINVAL; + return ret; +} + +static ssize_t gdlm_mounted_show(struct gdlm_ls *ls, char *buf) +{ + ssize_t ret; + int val = -2; + + if (test_bit(DFL_TERMINATE, &ls->flags)) + val = -1; + else if (test_bit(DFL_LEAVE_DONE, &ls->flags)) + val = 0; + else if (test_bit(DFL_JOIN_DONE, &ls->flags)) + val = 1; + ret = sprintf(buf, "%d\n", val); + return ret; +} + +static ssize_t gdlm_mounted_store(struct gdlm_ls *ls, const char *buf, size_t len) +{ + ssize_t ret = len; + int val; + + val = simple_strtol(buf, NULL, 0); + + if (val == 1) + set_bit(DFL_JOIN_DONE, &ls->flags); + else if (val == 0) + set_bit(DFL_LEAVE_DONE, &ls->flags); + else if (val == -1) { + set_bit(DFL_TERMINATE, &ls->flags); + set_bit(DFL_JOIN_DONE, &ls->flags); + set_bit(DFL_LEAVE_DONE, &ls->flags); + } else + ret = -EINVAL; + wake_up(&ls->wait_control); + return ret; +} + +static ssize_t gdlm_withdraw_show(struct gdlm_ls *ls, char *buf) +{ + ssize_t ret; + int val = 0; + + if (test_bit(DFL_WITHDRAW, &ls->flags)) + val = 1; + ret = sprintf(buf, "%d\n", val); + return ret; +} + +static ssize_t gdlm_withdraw_store(struct gdlm_ls *ls, const char *buf, size_t len) +{ + ssize_t ret = len; + int val; + + val = simple_strtol(buf, NULL, 0); + + if (val == 1) + set_bit(DFL_WITHDRAW, &ls->flags); + else + ret = -EINVAL; + wake_up(&ls->wait_control); + return ret; +} + +static ssize_t gdlm_jid_show(struct gdlm_ls *ls, char *buf) +{ + return sprintf(buf, "%u\n", ls->jid); +} + +static ssize_t gdlm_jid_store(struct gdlm_ls *ls, const char *buf, size_t len) +{ + ls->jid = simple_strtol(buf, NULL, 0); + return len; +} + +static ssize_t gdlm_first_show(struct gdlm_ls *ls, char *buf) +{ + return sprintf(buf, "%u\n", ls->first); +} + +static ssize_t gdlm_first_store(struct gdlm_ls *ls, const char *buf, size_t len) +{ + ls->first = simple_strtol(buf, NULL, 0); + return len; +} + +static ssize_t gdlm_first_done_show(struct gdlm_ls *ls, char *buf) +{ + return sprintf(buf, "%d\n", ls->first_done); +} + +static ssize_t gdlm_recover_show(struct gdlm_ls *ls, char *buf) +{ + return sprintf(buf, "%u\n", ls->recover_jid); +} + +static ssize_t gdlm_recover_store(struct gdlm_ls *ls, const char *buf, size_t len) +{ + ls->recover_jid = simple_strtol(buf, NULL, 0); + ls->fscb(ls->fsdata, LM_CB_NEED_RECOVERY, &ls->recover_jid); + return len; +} + +static ssize_t gdlm_recover_done_show(struct gdlm_ls *ls, char *buf) +{ + ssize_t ret; + ret = sprintf(buf, "%d\n", ls->recover_done); + return ret; +} + +static ssize_t gdlm_cluster_show(struct gdlm_ls *ls, char *buf) +{ + ssize_t ret; + ret = sprintf(buf, "%s\n", ls->clustername); + return ret; +} + +static ssize_t gdlm_options_show(struct gdlm_ls *ls, char *buf) +{ + ssize_t ret = 0; + + if (ls->fsflags & LM_MFLAG_SPECTATOR) + ret += sprintf(buf, "spectator "); + + return ret; +} + +struct gdlm_attr { + struct attribute attr; + ssize_t (*show)(struct gdlm_ls *, char *); + ssize_t (*store)(struct gdlm_ls *, const char *, size_t); +}; + +static struct gdlm_attr gdlm_attr_block = { + .attr = {.name = "block", .mode = S_IRUGO | S_IWUSR}, + .show = gdlm_block_show, + .store = gdlm_block_store +}; + +static struct gdlm_attr gdlm_attr_mounted = { + .attr = {.name = "mounted", .mode = S_IRUGO | S_IWUSR}, + .show = gdlm_mounted_show, + .store = gdlm_mounted_store +}; + +static struct gdlm_attr gdlm_attr_withdraw = { + .attr = {.name = "withdraw", .mode = S_IRUGO | S_IWUSR}, + .show = gdlm_withdraw_show, + .store = gdlm_withdraw_store +}; + +static struct gdlm_attr gdlm_attr_jid = { + .attr = {.name = "jid", .mode = S_IRUGO | S_IWUSR}, + .show = gdlm_jid_show, + .store = gdlm_jid_store +}; + +static struct gdlm_attr gdlm_attr_first = { + .attr = {.name = "first", .mode = S_IRUGO | S_IWUSR}, + .show = gdlm_first_show, + .store = gdlm_first_store +}; + +static struct gdlm_attr gdlm_attr_first_done = { + .attr = {.name = "first_done", .mode = S_IRUGO}, + .show = gdlm_first_done_show, +}; + +static struct gdlm_attr gdlm_attr_recover = { + .attr = {.name = "recover", .mode = S_IRUGO | S_IWUSR}, + .show = gdlm_recover_show, + .store = gdlm_recover_store +}; + +static struct gdlm_attr gdlm_attr_recover_done = { + .attr = {.name = "recover_done", .mode = S_IRUGO | S_IWUSR}, + .show = gdlm_recover_done_show, +}; + +static struct gdlm_attr gdlm_attr_cluster = { + .attr = {.name = "cluster", .mode = S_IRUGO | S_IWUSR}, + .show = gdlm_cluster_show, +}; + +static struct gdlm_attr gdlm_attr_options = { + .attr = {.name = "options", .mode = S_IRUGO | S_IWUSR}, + .show = gdlm_options_show, +}; + +static struct attribute *gdlm_attrs[] = { + &gdlm_attr_block.attr, + &gdlm_attr_mounted.attr, + &gdlm_attr_withdraw.attr, + &gdlm_attr_jid.attr, + &gdlm_attr_first.attr, + &gdlm_attr_first_done.attr, + &gdlm_attr_recover.attr, + &gdlm_attr_recover_done.attr, + &gdlm_attr_cluster.attr, + &gdlm_attr_options.attr, + NULL, +}; + +static ssize_t gdlm_attr_show(struct kobject *kobj, struct attribute *attr, + char *buf) +{ + struct gdlm_ls *ls = container_of(kobj, struct gdlm_ls, kobj); + struct gdlm_attr *a = container_of(attr, struct gdlm_attr, attr); + return a->show ? a->show(ls, buf) : 0; +} + +static ssize_t gdlm_attr_store(struct kobject *kobj, struct attribute *attr, + const char *buf, size_t len) +{ + struct gdlm_ls *ls = container_of(kobj, struct gdlm_ls, kobj); + struct gdlm_attr *a = container_of(attr, struct gdlm_attr, attr); + return a->store ? a->store(ls, buf, len) : len; +} + +static struct sysfs_ops gdlm_attr_ops = { + .show = gdlm_attr_show, + .store = gdlm_attr_store, +}; + +static struct kobj_type gdlm_ktype = { + .default_attrs = gdlm_attrs, + .sysfs_ops = &gdlm_attr_ops, +}; + +static struct kset gdlm_kset = { + .subsys = &kernel_subsys, + .kobj = {.name = "lock_dlm",}, + .ktype = &gdlm_ktype, +}; + +int gdlm_kobject_setup(struct gdlm_ls *ls) +{ + int error; + + error = kobject_set_name(&ls->kobj, "%s", ls->fsname); + if (error) + return error; + + ls->kobj.kset = &gdlm_kset; + ls->kobj.ktype = &gdlm_ktype; + + error = kobject_register(&ls->kobj); + + return 0; +} + +void gdlm_kobject_release(struct gdlm_ls *ls) +{ + kobject_unregister(&ls->kobj); +} + +int gdlm_sysfs_init(void) +{ + int error; + + error = kset_register(&gdlm_kset); + if (error) + printk("lock_dlm: cannot register kset %d\n", error); + + return error; +} + +void gdlm_sysfs_exit(void) +{ + kset_unregister(&gdlm_kset); +} + diff --git a/fs/gfs2/locking/dlm/thread.c b/fs/gfs2/locking/dlm/thread.c new file mode 100644 index 00000000000..22bbe6d3a5a --- /dev/null +++ b/fs/gfs2/locking/dlm/thread.c @@ -0,0 +1,359 @@ +/****************************************************************************** +******************************************************************************* +** +** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. +** Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved. +** +** This copyrighted material is made available to anyone wishing to use, +** modify, copy, or redistribute it subject to the terms and conditions +** of the GNU General Public License v.2. +** +******************************************************************************* +******************************************************************************/ + +#include "lock_dlm.h" + +/* A lock placed on this queue is re-submitted to DLM as soon as the lock_dlm + thread gets to it. */ + +static void queue_submit(struct gdlm_lock *lp) +{ + struct gdlm_ls *ls = lp->ls; + + spin_lock(&ls->async_lock); + list_add_tail(&lp->delay_list, &ls->submit); + spin_unlock(&ls->async_lock); + wake_up(&ls->thread_wait); +} + +static void process_submit(struct gdlm_lock *lp) +{ + gdlm_do_lock(lp, NULL); +} + +static void process_blocking(struct gdlm_lock *lp, int bast_mode) +{ + struct gdlm_ls *ls = lp->ls; + unsigned int cb; + + switch (gdlm_make_lmstate(bast_mode)) { + case LM_ST_EXCLUSIVE: + cb = LM_CB_NEED_E; + break; + case LM_ST_DEFERRED: + cb = LM_CB_NEED_D; + break; + case LM_ST_SHARED: + cb = LM_CB_NEED_S; + break; + default: + GDLM_ASSERT(0, printk("unknown bast mode %u\n",lp->bast_mode);); + } + + ls->fscb(ls->fsdata, cb, &lp->lockname); +} + +static void process_complete(struct gdlm_lock *lp) +{ + struct gdlm_ls *ls = lp->ls; + struct lm_async_cb acb; + int16_t prev_mode = lp->cur; + + memset(&acb, 0, sizeof(acb)); + + if (lp->lksb.sb_status == -DLM_ECANCEL) { + log_all("complete dlm cancel %x,%"PRIx64" flags %lx", + lp->lockname.ln_type, lp->lockname.ln_number, + lp->flags); + + lp->req = lp->cur; + acb.lc_ret |= LM_OUT_CANCELED; + if (lp->cur == DLM_LOCK_IV) + lp->lksb.sb_lkid = 0; + goto out; + } + + if (test_and_clear_bit(LFL_DLM_UNLOCK, &lp->flags)) { + if (lp->lksb.sb_status != -DLM_EUNLOCK) { + log_all("unlock sb_status %d %x,%"PRIx64" flags %lx", + lp->lksb.sb_status, lp->lockname.ln_type, + lp->lockname.ln_number, lp->flags); + return; + } + + lp->cur = DLM_LOCK_IV; + lp->req = DLM_LOCK_IV; + lp->lksb.sb_lkid = 0; + + if (test_and_clear_bit(LFL_UNLOCK_DELETE, &lp->flags)) { + gdlm_delete_lp(lp); + return; + } + goto out; + } + + if (lp->lksb.sb_flags & DLM_SBF_VALNOTVALID) + memset(lp->lksb.sb_lvbptr, 0, GDLM_LVB_SIZE); + + if (lp->lksb.sb_flags & DLM_SBF_ALTMODE) { + if (lp->req == DLM_LOCK_PR) + lp->req = DLM_LOCK_CW; + else if (lp->req == DLM_LOCK_CW) + lp->req = DLM_LOCK_PR; + } + + /* + * A canceled lock request. The lock was just taken off the delayed + * list and was never even submitted to dlm. + */ + + if (test_and_clear_bit(LFL_CANCEL, &lp->flags)) { + log_all("complete internal cancel %x,%"PRIx64"", + lp->lockname.ln_type, lp->lockname.ln_number); + lp->req = lp->cur; + acb.lc_ret |= LM_OUT_CANCELED; + goto out; + } + + /* + * An error occured. + */ + + if (lp->lksb.sb_status) { + /* a "normal" error */ + if ((lp->lksb.sb_status == -EAGAIN) && + (lp->lkf & DLM_LKF_NOQUEUE)) { + lp->req = lp->cur; + if (lp->cur == DLM_LOCK_IV) + lp->lksb.sb_lkid = 0; + goto out; + } + + /* this could only happen with cancels I think */ + log_all("ast sb_status %d %x,%"PRIx64" flags %lx", + lp->lksb.sb_status, lp->lockname.ln_type, + lp->lockname.ln_number, lp->flags); + return; + } + + /* + * This is an AST for an EX->EX conversion for sync_lvb from GFS. + */ + + if (test_and_clear_bit(LFL_SYNC_LVB, &lp->flags)) { + complete(&lp->ast_wait); + return; + } + + /* + * A lock has been demoted to NL because it initially completed during + * BLOCK_LOCKS. Now it must be requested in the originally requested + * mode. + */ + + if (test_and_clear_bit(LFL_REREQUEST, &lp->flags)) { + GDLM_ASSERT(lp->req == DLM_LOCK_NL,); + GDLM_ASSERT(lp->prev_req > DLM_LOCK_NL,); + + lp->cur = DLM_LOCK_NL; + lp->req = lp->prev_req; + lp->prev_req = DLM_LOCK_IV; + lp->lkf &= ~DLM_LKF_CONVDEADLK; + + set_bit(LFL_NOCACHE, &lp->flags); + + if (test_bit(DFL_BLOCK_LOCKS, &ls->flags) && + !test_bit(LFL_NOBLOCK, &lp->flags)) + gdlm_queue_delayed(lp); + else + queue_submit(lp); + return; + } + + /* + * A request is granted during dlm recovery. It may be granted + * because the locks of a failed node were cleared. In that case, + * there may be inconsistent data beneath this lock and we must wait + * for recovery to complete to use it. When gfs recovery is done this + * granted lock will be converted to NL and then reacquired in this + * granted state. + */ + + if (test_bit(DFL_BLOCK_LOCKS, &ls->flags) && + !test_bit(LFL_NOBLOCK, &lp->flags) && + lp->req != DLM_LOCK_NL) { + + lp->cur = lp->req; + lp->prev_req = lp->req; + lp->req = DLM_LOCK_NL; + lp->lkf |= DLM_LKF_CONVERT; + lp->lkf &= ~DLM_LKF_CONVDEADLK; + + log_debug("rereq %x,%"PRIx64" id %x %d,%d", + lp->lockname.ln_type, lp->lockname.ln_number, + lp->lksb.sb_lkid, lp->cur, lp->req); + + set_bit(LFL_REREQUEST, &lp->flags); + queue_submit(lp); + return; + } + + /* + * DLM demoted the lock to NL before it was granted so GFS must be + * told it cannot cache data for this lock. + */ + + if (lp->lksb.sb_flags & DLM_SBF_DEMOTED) + set_bit(LFL_NOCACHE, &lp->flags); + + out: + /* + * This is an internal lock_dlm lock + */ + + if (test_bit(LFL_INLOCK, &lp->flags)) { + clear_bit(LFL_NOBLOCK, &lp->flags); + lp->cur = lp->req; + complete(&lp->ast_wait); + return; + } + + /* + * Normal completion of a lock request. Tell GFS it now has the lock. + */ + + clear_bit(LFL_NOBLOCK, &lp->flags); + lp->cur = lp->req; + + acb.lc_name = lp->lockname; + acb.lc_ret |= gdlm_make_lmstate(lp->cur); + + if (!test_and_clear_bit(LFL_NOCACHE, &lp->flags) && + (lp->cur > DLM_LOCK_NL) && (prev_mode > DLM_LOCK_NL)) + acb.lc_ret |= LM_OUT_CACHEABLE; + + ls->fscb(ls->fsdata, LM_CB_ASYNC, &acb); +} + +static inline int no_work(struct gdlm_ls *ls, int blocking) +{ + int ret; + + spin_lock(&ls->async_lock); + ret = list_empty(&ls->complete) && list_empty(&ls->submit); + if (ret && blocking) + ret = list_empty(&ls->blocking); + spin_unlock(&ls->async_lock); + + return ret; +} + +static inline int check_drop(struct gdlm_ls *ls) +{ + if (!ls->drop_locks_count) + return 0; + + if (time_after(jiffies, ls->drop_time + ls->drop_locks_period * HZ)) { + ls->drop_time = jiffies; + if (ls->all_locks_count >= ls->drop_locks_count) + return 1; + } + return 0; +} + +static int gdlm_thread(void *data) +{ + struct gdlm_ls *ls = (struct gdlm_ls *) data; + struct gdlm_lock *lp = NULL; + int blist = 0; + uint8_t complete, blocking, submit, drop; + DECLARE_WAITQUEUE(wait, current); + + /* Only thread1 is allowed to do blocking callbacks since gfs + may wait for a completion callback within a blocking cb. */ + + if (current == ls->thread1) + blist = 1; + + while (!kthread_should_stop()) { + set_current_state(TASK_INTERRUPTIBLE); + add_wait_queue(&ls->thread_wait, &wait); + if (no_work(ls, blist)) + schedule(); + remove_wait_queue(&ls->thread_wait, &wait); + set_current_state(TASK_RUNNING); + + complete = blocking = submit = drop = 0; + + spin_lock(&ls->async_lock); + + if (blist && !list_empty(&ls->blocking)) { + lp = list_entry(ls->blocking.next, struct gdlm_lock, + blist); + list_del_init(&lp->blist); + blocking = lp->bast_mode; + lp->bast_mode = 0; + } else if (!list_empty(&ls->complete)) { + lp = list_entry(ls->complete.next, struct gdlm_lock, + clist); + list_del_init(&lp->clist); + complete = 1; + } else if (!list_empty(&ls->submit)) { + lp = list_entry(ls->submit.next, struct gdlm_lock, + delay_list); + list_del_init(&lp->delay_list); + submit = 1; + } + + drop = check_drop(ls); + spin_unlock(&ls->async_lock); + + if (complete) + process_complete(lp); + + else if (blocking) + process_blocking(lp, blocking); + + else if (submit) + process_submit(lp); + + if (drop) + ls->fscb(ls->fsdata, LM_CB_DROPLOCKS, NULL); + + schedule(); + } + + return 0; +} + +int gdlm_init_threads(struct gdlm_ls *ls) +{ + struct task_struct *p; + int error; + + p = kthread_run(gdlm_thread, ls, "lock_dlm1"); + error = IS_ERR(p); + if (error) { + log_all("can't start lock_dlm1 thread %d", error); + return error; + } + ls->thread1 = p; + + p = kthread_run(gdlm_thread, ls, "lock_dlm2"); + error = IS_ERR(p); + if (error) { + log_all("can't start lock_dlm2 thread %d", error); + kthread_stop(ls->thread1); + return error; + } + ls->thread2 = p; + + return 0; +} + +void gdlm_release_threads(struct gdlm_ls *ls) +{ + kthread_stop(ls->thread1); + kthread_stop(ls->thread2); +} + diff --git a/fs/gfs2/locking/nolock/Makefile b/fs/gfs2/locking/nolock/Makefile new file mode 100644 index 00000000000..cdadf956c83 --- /dev/null +++ b/fs/gfs2/locking/nolock/Makefile @@ -0,0 +1,3 @@ +obj-$(CONFIG_GFS2_FS) += lock_nolock.o +lock_nolock-y := main.o + diff --git a/fs/gfs2/locking/nolock/lock_nolock.mod.c b/fs/gfs2/locking/nolock/lock_nolock.mod.c new file mode 100644 index 00000000000..ae92522b218 --- /dev/null +++ b/fs/gfs2/locking/nolock/lock_nolock.mod.c @@ -0,0 +1,44 @@ +#include <linux/module.h> +#include <linux/vermagic.h> +#include <linux/compiler.h> + +MODULE_INFO(vermagic, VERMAGIC_STRING); + +#undef unix +struct module __this_module +__attribute__((section(".gnu.linkonce.this_module"))) = { + .name = __stringify(KBUILD_MODNAME), + .init = init_module, +#ifdef CONFIG_MODULE_UNLOAD + .exit = cleanup_module, +#endif +}; + +static const struct modversion_info ____versions[] +__attribute_used__ +__attribute__((section("__versions"))) = { + { 0x316962fc, "struct_module" }, + { 0x5a34a45c, "__kmalloc" }, + { 0x724beef2, "malloc_sizes" }, + { 0x3fa03a97, "memset" }, + { 0xc16fe12d, "__memcpy" }, + { 0xdd132261, "printk" }, + { 0x859204af, "sscanf" }, + { 0x3656bf5a, "lock_kernel" }, + { 0x1e6d26a8, "strstr" }, + { 0x41ede9df, "lm_register_proto" }, + { 0xb1f975aa, "unlock_kernel" }, + { 0x87b0b01f, "posix_lock_file_wait" }, + { 0x75f29cfd, "kmem_cache_alloc" }, + { 0x69384280, "lm_unregister_proto" }, + { 0x37a0cba, "kfree" }, + { 0x5d16bfe6, "posix_test_lock" }, +}; + +static const char __module_depends[] +__attribute_used__ +__attribute__((section(".modinfo"))) = +"depends=gfs2"; + + +MODULE_INFO(srcversion, "123E446F965A386A0C017C4"); diff --git a/fs/gfs2/locking/nolock/main.c b/fs/gfs2/locking/nolock/main.c new file mode 100644 index 00000000000..d3919e47116 --- /dev/null +++ b/fs/gfs2/locking/nolock/main.c @@ -0,0 +1,357 @@ +/****************************************************************************** +******************************************************************************* +** +** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. +** Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved. +** +** This copyrighted material is made available to anyone wishing to use, +** modify, copy, or redistribute it subject to the terms and conditions +** of the GNU General Public License v.2. +** +******************************************************************************* +******************************************************************************/ + +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/types.h> +#include <linux/fs.h> +#include <linux/smp_lock.h> + +#include "../../lm_interface.h" + +struct nolock_lockspace { + unsigned int nl_lvb_size; +}; + +struct lm_lockops nolock_ops; + +/** + * nolock_mount - mount a nolock lockspace + * @table_name: the name of the space to mount + * @host_data: host specific data + * @cb: the callback + * @fsdata: + * @min_lvb_size: + * @flags: + * @lockstruct: the structure of crap to fill in + * + * Returns: 0 on success, -EXXX on failure + */ + +static int nolock_mount(char *table_name, char *host_data, + lm_callback_t cb, lm_fsdata_t *fsdata, + unsigned int min_lvb_size, int flags, + struct lm_lockstruct *lockstruct) +{ + char *c; + unsigned int jid; + struct nolock_lockspace *nl; + + /* If there is a "jid=" in the hostdata, return that jid. + Otherwise, return zero. */ + + c = strstr(host_data, "jid="); + if (!c) + jid = 0; + else { + c += 4; + sscanf(c, "%u", &jid); + } + + nl = kmalloc(sizeof(struct nolock_lockspace), GFP_KERNEL); + if (!nl) + return -ENOMEM; + + memset(nl, 0, sizeof(struct nolock_lockspace)); + nl->nl_lvb_size = min_lvb_size; + + lockstruct->ls_jid = jid; + lockstruct->ls_first = 1; + lockstruct->ls_lvb_size = min_lvb_size; + lockstruct->ls_lockspace = (lm_lockspace_t *)nl; + lockstruct->ls_ops = &nolock_ops; + lockstruct->ls_flags = LM_LSFLAG_LOCAL; + + return 0; +} + +/** + * nolock_others_may_mount - unmount a lock space + * @lockspace: the lockspace to unmount + * + */ + +static void nolock_others_may_mount(lm_lockspace_t *lockspace) +{ +} + +/** + * nolock_unmount - unmount a lock space + * @lockspace: the lockspace to unmount + * + */ + +static void nolock_unmount(lm_lockspace_t *lockspace) +{ + struct nolock_lockspace *nl = (struct nolock_lockspace *)lockspace; + kfree(nl); +} + +/** + * nolock_withdraw - withdraw from a lock space + * @lockspace: the lockspace + * + */ + +static void nolock_withdraw(lm_lockspace_t *lockspace) +{ +} + +/** + * nolock_get_lock - get a lm_lock_t given a descripton of the lock + * @lockspace: the lockspace the lock lives in + * @name: the name of the lock + * @lockp: return the lm_lock_t here + * + * Returns: 0 on success, -EXXX on failure + */ + +static int nolock_get_lock(lm_lockspace_t *lockspace, struct lm_lockname *name, + lm_lock_t **lockp) +{ + *lockp = (lm_lock_t *)lockspace; + return 0; +} + +/** + * nolock_put_lock - get rid of a lock structure + * @lock: the lock to throw away + * + */ + +static void nolock_put_lock(lm_lock_t *lock) +{ +} + +/** + * nolock_lock - acquire a lock + * @lock: the lock to manipulate + * @cur_state: the current state + * @req_state: the requested state + * @flags: modifier flags + * + * Returns: A bitmap of LM_OUT_* + */ + +static unsigned int nolock_lock(lm_lock_t *lock, unsigned int cur_state, + unsigned int req_state, unsigned int flags) +{ + return req_state | LM_OUT_CACHEABLE; +} + +/** + * nolock_unlock - unlock a lock + * @lock: the lock to manipulate + * @cur_state: the current state + * + * Returns: 0 + */ + +static unsigned int nolock_unlock(lm_lock_t *lock, unsigned int cur_state) +{ + return 0; +} + +/** + * nolock_cancel - cancel a request on a lock + * @lock: the lock to cancel request for + * + */ + +static void nolock_cancel(lm_lock_t *lock) +{ +} + +/** + * nolock_hold_lvb - hold on to a lock value block + * @lock: the lock the LVB is associated with + * @lvbp: return the lm_lvb_t here + * + * Returns: 0 on success, -EXXX on failure + */ + +static int nolock_hold_lvb(lm_lock_t *lock, char **lvbp) +{ + struct nolock_lockspace *nl = (struct nolock_lockspace *)lock; + int error = 0; + + *lvbp = kmalloc(nl->nl_lvb_size, GFP_KERNEL); + if (*lvbp) + memset(*lvbp, 0, nl->nl_lvb_size); + else + error = -ENOMEM; + + return error; +} + +/** + * nolock_unhold_lvb - release a LVB + * @lock: the lock the LVB is associated with + * @lvb: the lock value block + * + */ + +static void nolock_unhold_lvb(lm_lock_t *lock, char *lvb) +{ + kfree(lvb); +} + +/** + * nolock_sync_lvb - sync out the value of a lvb + * @lock: the lock the LVB is associated with + * @lvb: the lock value block + * + */ + +static void nolock_sync_lvb(lm_lock_t *lock, char *lvb) +{ +} + +/** + * nolock_plock_get - + * @lockspace: the lockspace + * @name: + * @file: + * @fl: + * + * Returns: errno + */ + +static int nolock_plock_get(lm_lockspace_t *lockspace, struct lm_lockname *name, + struct file *file, struct file_lock *fl) +{ + struct file_lock *tmp; + + lock_kernel(); + tmp = posix_test_lock(file, fl); + fl->fl_type = F_UNLCK; + if (tmp) + memcpy(fl, tmp, sizeof(struct file_lock)); + unlock_kernel(); + + return 0; +} + +/** + * nolock_plock - + * @lockspace: the lockspace + * @name: + * @file: + * @cmd: + * @fl: + * + * Returns: errno + */ + +static int nolock_plock(lm_lockspace_t *lockspace, struct lm_lockname *name, + struct file *file, int cmd, struct file_lock *fl) +{ + int error; + lock_kernel(); + error = posix_lock_file_wait(file, fl); + unlock_kernel(); + return error; +} + +/** + * nolock_punlock - + * @lockspace: the lockspace + * @name: + * @file: + * @fl: + * + * Returns: errno + */ + +static int nolock_punlock(lm_lockspace_t *lockspace, struct lm_lockname *name, + struct file *file, struct file_lock *fl) +{ + int error; + lock_kernel(); + error = posix_lock_file_wait(file, fl); + unlock_kernel(); + return error; +} + +/** + * nolock_recovery_done - reset the expired locks for a given jid + * @lockspace: the lockspace + * @jid: the jid + * + */ + +static void nolock_recovery_done(lm_lockspace_t *lockspace, unsigned int jid, + unsigned int message) +{ +} + +struct lm_lockops nolock_ops = { + .lm_proto_name = "lock_nolock", + .lm_mount = nolock_mount, + .lm_others_may_mount = nolock_others_may_mount, + .lm_unmount = nolock_unmount, + .lm_withdraw = nolock_withdraw, + .lm_get_lock = nolock_get_lock, + .lm_put_lock = nolock_put_lock, + .lm_lock = nolock_lock, + .lm_unlock = nolock_unlock, + .lm_cancel = nolock_cancel, + .lm_hold_lvb = nolock_hold_lvb, + .lm_unhold_lvb = nolock_unhold_lvb, + .lm_sync_lvb = nolock_sync_lvb, + .lm_plock_get = nolock_plock_get, + .lm_plock = nolock_plock, + .lm_punlock = nolock_punlock, + .lm_recovery_done = nolock_recovery_done, + .lm_owner = THIS_MODULE, +}; + +/** + * init_nolock - Initialize the nolock module + * + * Returns: 0 on success, -EXXX on failure + */ + +int __init init_nolock(void) +{ + int error; + + error = lm_register_proto(&nolock_ops); + if (error) { + printk("lock_nolock: can't register protocol: %d\n", error); + return error; + } + + printk("Lock_Nolock (built %s %s) installed\n", __DATE__, __TIME__); + return 0; +} + +/** + * exit_nolock - cleanup the nolock module + * + */ + +void __exit exit_nolock(void) +{ + lm_unregister_proto(&nolock_ops); +} + +module_init(init_nolock); +module_exit(exit_nolock); + +MODULE_DESCRIPTION("GFS Nolock Locking Module"); +MODULE_AUTHOR("Red Hat, Inc."); +MODULE_LICENSE("GPL"); + |