X-Git-Url: http://pilppa.org/gitweb/gitweb.cgi?a=blobdiff_plain;f=fs%2Feventpoll.c;h=3a3567433b921795c9ba6a7fe879a9b6760c923f;hb=96da96065bd66164acc3c8a1ea6db4ee765537e9;hp=4284cd31eba6dcb6f125f1fd574aa2213439b45f;hpb=dad2ad82c5f058367df79de022bd12d36afcd065;p=linux-2.6-omap-h63xx.git diff --git a/fs/eventpoll.c b/fs/eventpoll.c index 4284cd31eba..3a3567433b9 100644 --- a/fs/eventpoll.c +++ b/fs/eventpoll.c @@ -1,6 +1,6 @@ /* * fs/eventpoll.c ( Efficent event polling implementation ) - * Copyright (C) 2001,...,2003 Davide Libenzi + * Copyright (C) 2001,...,2006 Davide Libenzi * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by @@ -34,6 +34,7 @@ #include #include #include +#include #include #include #include @@ -46,7 +47,7 @@ * LOCKING: * There are three level of locking required by epoll : * - * 1) epsem (semaphore) + * 1) epmutex (mutex) * 2) ep->sem (rw_semaphore) * 3) ep->lock (rw_lock) * @@ -67,9 +68,9 @@ * if a file has been pushed inside an epoll set and it is then * close()d without a previous call toepoll_ctl(EPOLL_CTL_DEL). * It is possible to drop the "ep->sem" and to use the global - * semaphore "epsem" (together with "ep->lock") to have it working, + * semaphore "epmutex" (together with "ep->lock") to have it working, * but having "ep->sem" will make the interface more scalable. - * Events that require holding "epsem" are very rare, while for + * Events that require holding "epmutex" are very rare, while for * normal operations the epoll private "ep->sem" will guarantee * a greater scalability. */ @@ -119,7 +120,7 @@ struct epoll_filefd { */ struct wake_task_node { struct list_head llink; - task_t *task; + struct task_struct *task; wait_queue_head_t *wq; }; @@ -267,29 +268,29 @@ static int ep_poll(struct eventpoll *ep, struct epoll_event __user *events, int maxevents, long timeout); static int eventpollfs_delete_dentry(struct dentry *dentry); static struct inode *ep_eventpoll_inode(void); -static struct super_block *eventpollfs_get_sb(struct file_system_type *fs_type, - int flags, const char *dev_name, - void *data); +static int eventpollfs_get_sb(struct file_system_type *fs_type, + int flags, const char *dev_name, + void *data, struct vfsmount *mnt); /* * This semaphore is used to serialize ep_free() and eventpoll_release_file(). */ -static struct semaphore epsem; +static struct mutex epmutex; /* Safe wake up implementation */ static struct poll_safewake psw; /* Slab cache used to allocate "struct epitem" */ -static kmem_cache_t *epi_cache; +static kmem_cache_t *epi_cache __read_mostly; /* Slab cache used to allocate "struct eppoll_entry" */ -static kmem_cache_t *pwq_cache; +static kmem_cache_t *pwq_cache __read_mostly; /* Virtual fs used to allocate inodes for eventpoll files */ -static struct vfsmount *eventpoll_mnt; +static struct vfsmount *eventpoll_mnt __read_mostly; /* File callbacks that implement the eventpoll file behaviour */ -static struct file_operations eventpoll_fops = { +static const struct file_operations eventpoll_fops = { .release = ep_eventpoll_close, .poll = ep_eventpoll_poll }; @@ -336,20 +337,20 @@ static inline int ep_cmp_ffd(struct epoll_filefd *p1, /* Special initialization for the rb-tree node to detect linkage */ static inline void ep_rb_initnode(struct rb_node *n) { - n->rb_parent = n; + rb_set_parent(n, n); } /* Removes a node from the rb-tree and marks it for a fast is-linked check */ static inline void ep_rb_erase(struct rb_node *n, struct rb_root *r) { rb_erase(n, r); - n->rb_parent = n; + rb_set_parent(n, n); } /* Fast check to verify that the item is linked to the main rb-tree */ static inline int ep_rb_linked(struct rb_node *n) { - return n->rb_parent != n; + return rb_parent(n) != n; } /* @@ -412,7 +413,7 @@ static void ep_poll_safewake(struct poll_safewake *psw, wait_queue_head_t *wq) { int wake_nests = 0; unsigned long flags; - task_t *this_task = current; + struct task_struct *this_task = current; struct list_head *lsthead = &psw->wake_task_list, *lnk; struct wake_task_node *tncur; struct wake_task_node tnode; @@ -451,15 +452,6 @@ static void ep_poll_safewake(struct poll_safewake *psw, wait_queue_head_t *wq) } -/* Used to initialize the epoll bits inside the "struct file" */ -void eventpoll_init_file(struct file *file) -{ - - INIT_LIST_HEAD(&file->f_ep_links); - spin_lock_init(&file->f_ep_lock); -} - - /* * This is called from eventpoll_release() to unlink files from the eventpoll * interface. We need to have this facility to cleanup correctly files that are @@ -477,10 +469,10 @@ void eventpoll_release_file(struct file *file) * cleanup path, and this means that noone is using this file anymore. * The only hit might come from ep_free() but by holding the semaphore * will correctly serialize the operation. We do need to acquire - * "ep->sem" after "epsem" because ep_remove() requires it when called + * "ep->sem" after "epmutex" because ep_remove() requires it when called * from anywhere but ep_free(). */ - down(&epsem); + mutex_lock(&epmutex); while (!list_empty(lsthead)) { epi = list_entry(lsthead->next, struct epitem, fllink); @@ -492,7 +484,7 @@ void eventpoll_release_file(struct file *file) up_write(&ep->sem); } - up(&epsem); + mutex_unlock(&epmutex); } @@ -819,9 +811,9 @@ static void ep_free(struct eventpoll *ep) * We do not need to hold "ep->sem" here because the epoll file * is on the way to be removed and no one has references to it * anymore. The only hit might come from eventpoll_release_file() but - * holding "epsem" is sufficent here. + * holding "epmutex" is sufficent here. */ - down(&epsem); + mutex_lock(&epmutex); /* * Walks through the whole tree by unregistering poll callbacks. @@ -843,7 +835,7 @@ static void ep_free(struct eventpoll *ep) ep_remove(ep, epi); } - up(&epsem); + mutex_unlock(&epmutex); } @@ -1012,7 +1004,7 @@ static int ep_insert(struct eventpoll *ep, struct epoll_event *event, /* Notify waiting tasks that events are available */ if (waitqueue_active(&ep->wq)) - wake_up(&ep->wq); + __wake_up_locked(&ep->wq, TASK_UNINTERRUPTIBLE | TASK_INTERRUPTIBLE); if (waitqueue_active(&ep->poll_wait)) pwake++; } @@ -1091,7 +1083,8 @@ static int ep_modify(struct eventpoll *ep, struct epitem *epi, struct epoll_even /* Notify waiting tasks that events are available */ if (waitqueue_active(&ep->wq)) - wake_up(&ep->wq); + __wake_up_locked(&ep->wq, TASK_UNINTERRUPTIBLE | + TASK_INTERRUPTIBLE); if (waitqueue_active(&ep->poll_wait)) pwake++; } @@ -1175,7 +1168,7 @@ static int ep_unlink(struct eventpoll *ep, struct epitem *epi) eexit_1: DNPRINTK(3, (KERN_INFO "[%p] eventpoll: ep_unlink(%p, %p) = %d\n", - current, ep, epi->file, error)); + current, ep, epi->ffd.file, error)); return error; } @@ -1243,7 +1236,7 @@ static int ep_poll_callback(wait_queue_t *wait, unsigned mode, int sync, void *k struct eventpoll *ep = epi->ep; DNPRINTK(3, (KERN_INFO "[%p] eventpoll: poll_callback(%p) epi=%p ep=%p\n", - current, epi->file, epi, ep)); + current, epi->ffd.file, epi, ep)); write_lock_irqsave(&ep->lock, flags); @@ -1268,7 +1261,8 @@ is_linked: * wait list. */ if (waitqueue_active(&ep->wq)) - wake_up(&ep->wq); + __wake_up_locked(&ep->wq, TASK_UNINTERRUPTIBLE | + TASK_INTERRUPTIBLE); if (waitqueue_active(&ep->poll_wait)) pwake++; @@ -1452,7 +1446,8 @@ static void ep_reinject_items(struct eventpoll *ep, struct list_head *txlist) * wait list. */ if (waitqueue_active(&ep->wq)) - wake_up(&ep->wq); + __wake_up_locked(&ep->wq, TASK_UNINTERRUPTIBLE | + TASK_INTERRUPTIBLE); if (waitqueue_active(&ep->poll_wait)) pwake++; } @@ -1524,7 +1519,7 @@ retry: * ep_poll_callback() when events will become available. */ init_waitqueue_entry(&wait, current); - add_wait_queue(&ep->wq, &wait); + __add_wait_queue(&ep->wq, &wait); for (;;) { /* @@ -1544,7 +1539,7 @@ retry: jtimeout = schedule_timeout(jtimeout); write_lock_irqsave(&ep->lock, flags); } - remove_wait_queue(&ep->wq, &wait); + __remove_wait_queue(&ep->wq, &wait); set_current_state(TASK_RUNNING); } @@ -1603,11 +1598,12 @@ eexit_1: } -static struct super_block * +static int eventpollfs_get_sb(struct file_system_type *fs_type, int flags, - const char *dev_name, void *data) + const char *dev_name, void *data, struct vfsmount *mnt) { - return get_sb_pseudo(fs_type, "eventpoll:", NULL, EVENTPOLLFS_MAGIC); + return get_sb_pseudo(fs_type, "eventpoll:", NULL, EVENTPOLLFS_MAGIC, + mnt); } @@ -1615,7 +1611,7 @@ static int __init eventpoll_init(void) { int error; - init_MUTEX(&epsem); + mutex_init(&epmutex); /* Initialize the structure used to perform safe poll wait head wake ups */ ep_poll_safewake_init(&psw);