diff options
Diffstat (limited to 'ext2fs')
| -rw-r--r-- | ext2fs/pager.c | 116 |
1 files changed, 52 insertions, 64 deletions
diff --git a/ext2fs/pager.c b/ext2fs/pager.c index 96e81c25..56120a51 100644 --- a/ext2fs/pager.c +++ b/ext2fs/pager.c @@ -21,8 +21,8 @@ #include <strings.h> #include "ext2fs.h" -spin_lock_t pager_list_lock = SPIN_LOCK_INITIALIZER; -struct user_pager_info *file_pager_list; +/* A ports bucket to hold pager ports. */ +static struct port_bucket *pager_bucket; spin_lock_t node_to_page_lock = SPIN_LOCK_INITIALIZER; @@ -556,13 +556,13 @@ diskfs_file_update (struct node *node, int wait) spin_lock (&node_to_page_lock); upi = node->dn->fileinfo; if (upi) - pager_reference (upi->p); + ports_port_ref (upi->p); spin_unlock (&node_to_page_lock); if (upi) { pager_sync (upi->p, wait); - pager_unreference (upi->p); + ports_port_deref (upi->p); } pokel_sync (&node->dn->indir_pokel, wait); @@ -602,27 +602,48 @@ pager_clear_user_data (struct user_pager_info *upi) spin_unlock (&node_to_page_lock); diskfs_nrele_light (upi->node); - - spin_lock (&pager_list_lock); - *upi->prevp = upi->next; - if (upi->next) - upi->next->prevp = upi->prevp; - spin_unlock (&pager_list_lock); } free (upi); } + +/* This will be called when the ports library wants to drop weak references. + The pager library creates no weak references itself. If the user doesn't + either, then it's OK for this function to do nothing. */ +void +pager_dropweak (struct user_pager_info *p __attribute__ ((unused))) +{ +} /* ---------------------------------------------------------------- */ +/* A top-level function for the paging thread that just services paging + requests. */ +static void +service_paging_requests (any_t foo __attribute__ ((unused))) +{ + for (;;) + ports_manage_port_operations_multithread (pager_bucket, pager_demuxer, + 1000 * 60 * 2, 1000 * 60 * 10, + 1, MACH_PORT_NULL); +} + /* Create a the DISK pager, initializing DISKPAGER, and DISKPAGERPORT */ void create_disk_pager () { + pager_bucket = ports_create_bucket (); + + /* Make a thread to service paging requests. */ + cthread_detach (cthread_fork ((cthread_fn_t)service_paging_requests, + (any_t)0)); + disk_pager = malloc (sizeof (struct user_pager_info)); disk_pager->type = DISK; disk_pager->node = 0; - disk_pager->p = pager_create (disk_pager, MAY_CACHE, MEMORY_OBJECT_COPY_NONE); + disk_pager->p = + pager_create (disk_pager, pager_bucket, + MAY_CACHE, MEMORY_OBJECT_COPY_NONE); disk_pager_port = pager_get_port (disk_pager->p); mach_port_insert_right (mach_task_self (), disk_pager_port, disk_pager_port, MACH_MSG_TYPE_MAKE_SEND); @@ -647,16 +668,9 @@ diskfs_get_filemap (struct node *node) upi->type = FILE_DATA; upi->node = node; diskfs_nref_light (node); - upi->p = pager_create (upi, MAY_CACHE, MEMORY_OBJECT_COPY_DELAY); + upi->p = + pager_create (upi, pager_bucket, MAY_CACHE, MEMORY_OBJECT_COPY_DELAY); node->dn->fileinfo = upi; - - spin_lock (&pager_list_lock); - upi->next = file_pager_list; - upi->prevp = &file_pager_list; - if (upi->next) - upi->next->prevp = &upi->next; - file_pager_list = upi; - spin_unlock (&pager_list_lock); } right = pager_get_port (node->dn->fileinfo->p); spin_unlock (&node_to_page_lock); @@ -677,13 +691,13 @@ drop_pager_softrefs (struct node *node) spin_lock (&node_to_page_lock); upi = node->dn->fileinfo; if (upi) - pager_reference (upi->p); + ports_port_ref (upi->p); spin_unlock (&node_to_page_lock); if (MAY_CACHE && upi) pager_change_attributes (upi->p, 0, MEMORY_OBJECT_COPY_DELAY, 0); if (upi) - pager_unreference (upi->p); + ports_port_deref (upi->p); } /* Call this when we should turn on caching because it's no longer @@ -696,13 +710,13 @@ allow_pager_softrefs (struct node *node) spin_lock (&node_to_page_lock); upi = node->dn->fileinfo; if (upi) - pager_reference (upi->p); + ports_port_ref (upi->p); spin_unlock (&node_to_page_lock); if (MAY_CACHE && upi) pager_change_attributes (upi->p, 1, MEMORY_OBJECT_COPY_DELAY, 0); if (upi) - pager_unreference (upi->p); + ports_port_deref (upi->p); } /* Call this to find out the struct pager * corresponding to the @@ -717,48 +731,18 @@ diskfs_get_filemap_pager_struct (struct node *node) return node->dn->fileinfo->p; } -/* Call function FUNC (which takes one argument, a pager) on each pager, with - all file pagers being processed before the disk pager. Make the calls - while holding no locks. */ -static void -pager_traverse (void (*func)(struct user_pager_info *)) -{ - struct user_pager_info *p; - struct item {struct item *next; struct user_pager_info *p;} *list = 0; - struct item *i; - - spin_lock (&pager_list_lock); - for (p = file_pager_list; p; p = p->next) - /* XXXXXXX THIS CHECK IS A HACK TO MAKE A RACE WITH DEPARTING PAGERS - RARER, UNTIL MIB FIXES PORTS TO HAVE SOFT REFERENCES!!!! XXXXX */ - if (((struct port_info *)p->p)->refcnt > 0) - { - i = alloca (sizeof (struct item)); - i->next = list; - list = i; - pager_reference (p->p); - i->p = p; - } - spin_unlock (&pager_list_lock); - - for (i = list; i; i = i->next) - { - (*func)(i->p); - pager_unreference (i->p->p); - } - - (*func)(disk_pager); -} - static struct ext2_super_block final_sblock; /* Shutdown all the pagers. */ void diskfs_shutdown_pager () { - void shutdown_one (struct user_pager_info *p) + error_t shutdown_one (void *v_p) { - pager_shutdown (p->p); + struct user_pager_info *p = v_p; + if (p != disk_pager) + pager_shutdown (p->p); + return 0; } write_all_disknodes (); @@ -768,21 +752,25 @@ diskfs_shutdown_pager () bcopy (sblock, &final_sblock, sizeof (final_sblock)); sblock = &final_sblock; - pager_traverse (shutdown_one); + ports_bucket_iterate (pager_bucket, shutdown_one); + pager_shutdown (disk_pager->p); } /* Sync all the pagers. */ void diskfs_sync_everything (int wait) { - void sync_one (struct user_pager_info *p) + error_t sync_one (void *v_p) { + struct user_pager_info *p = v_p; if (p != disk_pager) pager_sync (p->p, wait); - else - pokel_sync (&global_pokel, wait); + return 0; } write_all_disknodes (); - pager_traverse (sync_one); + ports_bucket_iterate (pager_bucket, sync_one); + + /* Do things on the the disk pager. */ + pokel_sync (&global_pokel, wait); } |