X-Git-Url: http://www.aleph1.co.uk/gitweb/?p=yaffs2.git;a=blobdiff_plain;f=yaffs_allocator.c;h=695c2541153e937580bbf2c87b72bc704425c7ba;hp=c0513d54ec5d13cbcde6260e32893d07732cebf6;hb=6500cebaa2c93512d544719956af259ca13f83b7;hpb=41573908f821bcb40750e7c069ea8f5178f630e5 diff --git a/yaffs_allocator.c b/yaffs_allocator.c index c0513d5..695c254 100644 --- a/yaffs_allocator.c +++ b/yaffs_allocator.c @@ -1,5 +1,5 @@ /* - * YAFFS: Yet another Flash File System . A NAND-flash specific file system. + * YAFFS: Yet Another Flash File System. A NAND-flash specific file system. * * Copyright (C) 2002-2010 Aleph One Ltd. * for Toby Churchill Ltd and Brightstar Engineering @@ -7,293 +7,247 @@ * Created by Charles Manning * * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU Lesser General Public License version 2.1 as + * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. - * - * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL. */ - #include "yaffs_allocator.h" #include "yaffs_guts.h" #include "yaffs_trace.h" #include "yportenv.h" -#ifdef CONFIG_YAFFS_YMALLOC_ALLOCATOR - -void yaffs_deinit_raw_tnodes_and_objs(yaffs_dev_t *dev) -{ - dev = dev; -} - -void yaffs_init_raw_tnodes_and_objs(yaffs_dev_t *dev) -{ - dev = dev; -} - -yaffs_tnode_t *yaffs_alloc_raw_tnode(yaffs_dev_t *dev) -{ - return (yaffs_tnode_t *)YMALLOC(dev->tnode_size); -} - -void yaffs_free_raw_tnode(yaffs_dev_t *dev, yaffs_tnode_t *tn) -{ - dev = dev; - YFREE(tn); -} - -void yaffs_init_raw_objs(yaffs_dev_t *dev) -{ - dev = dev; -} - -void yaffs_deinit_raw_objs(yaffs_dev_t *dev) -{ - dev = dev; -} - -yaffs_obj_t *yaffs_alloc_raw_obj(yaffs_dev_t *dev) -{ - dev = dev; - return (yaffs_obj_t *) YMALLOC(sizeof(yaffs_obj_t)); -} - - -void yaffs_free_raw_obj(yaffs_dev_t *dev, yaffs_obj_t *obj) -{ - - dev = dev; - YFREE(obj); -} - -#else +/* + * Each entry in yaffs_tnode_list and yaffs_obj_list hold blocks + * of approx 100 objects that are themn allocated singly. + * This is basically a simplified slab allocator. + * + * We don't use the Linux slab allocator because slab does not allow + * us to dump all the objects in one hit when we do a umount and tear + * down all the tnodes and objects. slab requires that we first free + * the individual objects. + * + * Once yaffs has been mainlined I shall try to motivate for a change + * to slab to provide the extra features we need here. + */ struct yaffs_tnode_list { struct yaffs_tnode_list *next; - yaffs_tnode_t *tnodes; + struct yaffs_tnode *tnodes; }; -typedef struct yaffs_tnode_list yaffs_tnodelist_t; - -struct yaffs_obj_tList_struct { - yaffs_obj_t *objects; - struct yaffs_obj_tList_struct *next; +struct yaffs_obj_list { + struct yaffs_obj_list *next; + struct yaffs_obj *objects; }; -typedef struct yaffs_obj_tList_struct yaffs_obj_tList; - +struct yaffs_allocator { + int n_tnodes_created; + struct yaffs_tnode *free_tnodes; + int n_free_tnodes; + struct yaffs_tnode_list *alloc_tnode_list; -struct yaffs_AllocatorStruct { - int n_tnodesCreated; - yaffs_tnode_t *freeTnodes; - int nFreeTnodes; - yaffs_tnodelist_t *allocatedTnodeList; + int n_obj_created; + struct list_head free_objs; + int n_free_objects; - int n_objCreated; - yaffs_obj_t *freeObjects; - int nFreeObjects; - - yaffs_obj_tList *allocatedObjectList; + struct yaffs_obj_list *allocated_obj_list; }; -typedef struct yaffs_AllocatorStruct yaffs_Allocator; - - -static void yaffs_deinit_raw_tnodes(yaffs_dev_t *dev) +static void yaffs_deinit_raw_tnodes(struct yaffs_dev *dev) { + struct yaffs_allocator *allocator = + (struct yaffs_allocator *)dev->allocator; + struct yaffs_tnode_list *tmp; - yaffs_Allocator *allocator = (yaffs_Allocator *)dev->allocator; - - yaffs_tnodelist_t *tmp; - - if(!allocator){ - YBUG(); + if (!allocator) { + BUG(); return; } - while (allocator->allocatedTnodeList) { - tmp = allocator->allocatedTnodeList->next; - - YFREE(allocator->allocatedTnodeList->tnodes); - YFREE(allocator->allocatedTnodeList); - allocator->allocatedTnodeList = tmp; + while (allocator->alloc_tnode_list) { + tmp = allocator->alloc_tnode_list->next; + kfree(allocator->alloc_tnode_list->tnodes); + kfree(allocator->alloc_tnode_list); + allocator->alloc_tnode_list = tmp; } - allocator->freeTnodes = NULL; - allocator->nFreeTnodes = 0; - allocator->n_tnodesCreated = 0; + allocator->free_tnodes = NULL; + allocator->n_free_tnodes = 0; + allocator->n_tnodes_created = 0; } -static void yaffs_init_raw_tnodes(yaffs_dev_t *dev) +static void yaffs_init_raw_tnodes(struct yaffs_dev *dev) { - yaffs_Allocator *allocator = dev->allocator; - - if(allocator){ - allocator->allocatedTnodeList = NULL; - allocator->freeTnodes = NULL; - allocator->nFreeTnodes = 0; - allocator->n_tnodesCreated = 0; - } else - YBUG(); + struct yaffs_allocator *allocator = dev->allocator; + + if (!allocator) { + BUG(); + return; + } + + allocator->alloc_tnode_list = NULL; + allocator->free_tnodes = NULL; + allocator->n_free_tnodes = 0; + allocator->n_tnodes_created = 0; } -static int yaffs_create_tnodes(yaffs_dev_t *dev, int n_tnodes) +static int yaffs_create_tnodes(struct yaffs_dev *dev, int n_tnodes) { - yaffs_Allocator *allocator = (yaffs_Allocator *)dev->allocator; + struct yaffs_allocator *allocator = + (struct yaffs_allocator *)dev->allocator; int i; - yaffs_tnode_t *newTnodes; - __u8 *mem; - yaffs_tnode_t *curr; - yaffs_tnode_t *next; - yaffs_tnodelist_t *tnl; - - if(!allocator){ - YBUG(); + struct yaffs_tnode *new_tnodes; + u8 *mem; + struct yaffs_tnode *curr; + struct yaffs_tnode *next; + struct yaffs_tnode_list *tnl; + + if (!allocator) { + BUG(); return YAFFS_FAIL; } if (n_tnodes < 1) return YAFFS_OK; - /* make these things */ + new_tnodes = kmalloc(n_tnodes * dev->tnode_size, GFP_NOFS); + mem = (u8 *) new_tnodes; - newTnodes = YMALLOC(n_tnodes * dev->tnode_size); - mem = (__u8 *)newTnodes; - - if (!newTnodes) { - T(YAFFS_TRACE_ERROR, - (TSTR("yaffs: Could not allocate Tnodes" TENDSTR))); + if (!new_tnodes) { + yaffs_trace(YAFFS_TRACE_ERROR, + "yaffs: Could not allocate Tnodes"); return YAFFS_FAIL; } /* New hookup for wide tnodes */ for (i = 0; i < n_tnodes - 1; i++) { - curr = (yaffs_tnode_t *) &mem[i * dev->tnode_size]; - next = (yaffs_tnode_t *) &mem[(i+1) * dev->tnode_size]; + curr = (struct yaffs_tnode *)&mem[i * dev->tnode_size]; + next = (struct yaffs_tnode *)&mem[(i + 1) * dev->tnode_size]; curr->internal[0] = next; } - curr = (yaffs_tnode_t *) &mem[(n_tnodes - 1) * dev->tnode_size]; - curr->internal[0] = allocator->freeTnodes; - allocator->freeTnodes = (yaffs_tnode_t *)mem; + curr = (struct yaffs_tnode *)&mem[(n_tnodes - 1) * dev->tnode_size]; + curr->internal[0] = allocator->free_tnodes; + allocator->free_tnodes = (struct yaffs_tnode *)mem; - allocator->nFreeTnodes += n_tnodes; - allocator->n_tnodesCreated += n_tnodes; + allocator->n_free_tnodes += n_tnodes; + allocator->n_tnodes_created += n_tnodes; /* Now add this bunch of tnodes to a list for freeing up. * NB If we can't add this to the management list it isn't fatal * but it just means we can't free this bunch of tnodes later. */ - - tnl = YMALLOC(sizeof(yaffs_tnodelist_t)); + tnl = kmalloc(sizeof(struct yaffs_tnode_list), GFP_NOFS); if (!tnl) { - T(YAFFS_TRACE_ERROR, - (TSTR - ("yaffs: Could not add tnodes to management list" TENDSTR))); - return YAFFS_FAIL; + yaffs_trace(YAFFS_TRACE_ERROR, + "Could not add tnodes to management list"); + return YAFFS_FAIL; } else { - tnl->tnodes = newTnodes; - tnl->next = allocator->allocatedTnodeList; - allocator->allocatedTnodeList = tnl; + tnl->tnodes = new_tnodes; + tnl->next = allocator->alloc_tnode_list; + allocator->alloc_tnode_list = tnl; } - T(YAFFS_TRACE_ALLOCATE, (TSTR("yaffs: Tnodes added" TENDSTR))); + yaffs_trace(YAFFS_TRACE_ALLOCATE, "Tnodes added"); return YAFFS_OK; } - -yaffs_tnode_t *yaffs_alloc_raw_tnode(yaffs_dev_t *dev) +struct yaffs_tnode *yaffs_alloc_raw_tnode(struct yaffs_dev *dev) { - yaffs_Allocator *allocator = (yaffs_Allocator *)dev->allocator; - yaffs_tnode_t *tn = NULL; + struct yaffs_allocator *allocator = + (struct yaffs_allocator *)dev->allocator; + struct yaffs_tnode *tn = NULL; - if(!allocator){ - YBUG(); + if (!allocator) { + BUG(); return NULL; } /* If there are none left make more */ - if (!allocator->freeTnodes) + if (!allocator->free_tnodes) yaffs_create_tnodes(dev, YAFFS_ALLOCATION_NTNODES); - if (allocator->freeTnodes) { - tn = allocator->freeTnodes; - allocator->freeTnodes = allocator->freeTnodes->internal[0]; - allocator->nFreeTnodes--; + if (allocator->free_tnodes) { + tn = allocator->free_tnodes; + allocator->free_tnodes = allocator->free_tnodes->internal[0]; + allocator->n_free_tnodes--; } return tn; } /* FreeTnode frees up a tnode and puts it back on the free list */ -void yaffs_free_raw_tnode(yaffs_dev_t *dev, yaffs_tnode_t *tn) +void yaffs_free_raw_tnode(struct yaffs_dev *dev, struct yaffs_tnode *tn) { - yaffs_Allocator *allocator = dev->allocator; + struct yaffs_allocator *allocator = dev->allocator; - if(!allocator){ - YBUG(); + if (!allocator) { + BUG(); return; } if (tn) { - tn->internal[0] = allocator->freeTnodes; - allocator->freeTnodes = tn; - allocator->nFreeTnodes++; + tn->internal[0] = allocator->free_tnodes; + allocator->free_tnodes = tn; + allocator->n_free_tnodes++; } - dev->checkpoint_blocks_required = 0; /* force recalculation*/ + dev->checkpoint_blocks_required = 0; /* force recalculation */ } +/*--------------- yaffs_obj alloaction ------------------------ + * + * Free yaffs_objs are stored in a list using obj->siblings. + * The blocks of allocated objects are stored in a linked list. + */ - -static void yaffs_init_raw_objs(yaffs_dev_t *dev) +static void yaffs_init_raw_objs(struct yaffs_dev *dev) { - yaffs_Allocator *allocator = dev->allocator; - - if(allocator) { - allocator->allocatedObjectList = NULL; - allocator->freeObjects = NULL; - allocator->nFreeObjects = 0; - } else - YBUG(); + struct yaffs_allocator *allocator = dev->allocator; + + if (!allocator) { + BUG(); + return; + } + + allocator->allocated_obj_list = NULL; + INIT_LIST_HEAD(&allocator->free_objs); + allocator->n_free_objects = 0; } -static void yaffs_deinit_raw_objs(yaffs_dev_t *dev) +static void yaffs_deinit_raw_objs(struct yaffs_dev *dev) { - yaffs_Allocator *allocator = dev->allocator; - yaffs_obj_tList *tmp; + struct yaffs_allocator *allocator = dev->allocator; + struct yaffs_obj_list *tmp; - if(!allocator){ - YBUG(); + if (!allocator) { + BUG(); return; } - while (allocator->allocatedObjectList) { - tmp = allocator->allocatedObjectList->next; - YFREE(allocator->allocatedObjectList->objects); - YFREE(allocator->allocatedObjectList); - - allocator->allocatedObjectList = tmp; + while (allocator->allocated_obj_list) { + tmp = allocator->allocated_obj_list->next; + kfree(allocator->allocated_obj_list->objects); + kfree(allocator->allocated_obj_list); + allocator->allocated_obj_list = tmp; } - allocator->freeObjects = NULL; - allocator->nFreeObjects = 0; - allocator->n_objCreated = 0; + INIT_LIST_HEAD(&allocator->free_objs); + allocator->n_free_objects = 0; + allocator->n_obj_created = 0; } - -static int yaffs_create_free_objs(yaffs_dev_t *dev, int n_obj) +static int yaffs_create_free_objs(struct yaffs_dev *dev, int n_obj) { - yaffs_Allocator *allocator = dev->allocator; - + struct yaffs_allocator *allocator = dev->allocator; int i; - yaffs_obj_t *newObjects; - yaffs_obj_tList *list; + struct yaffs_obj *new_objs; + struct yaffs_obj_list *list; - if(!allocator){ - YBUG(); + if (!allocator) { + BUG(); return YAFFS_FAIL; } @@ -301,109 +255,103 @@ static int yaffs_create_free_objs(yaffs_dev_t *dev, int n_obj) return YAFFS_OK; /* make these things */ - newObjects = YMALLOC(n_obj * sizeof(yaffs_obj_t)); - list = YMALLOC(sizeof(yaffs_obj_tList)); - - if (!newObjects || !list) { - if (newObjects){ - YFREE(newObjects); - newObjects = NULL; - } - if (list){ - YFREE(list); - list = NULL; - } - T(YAFFS_TRACE_ALLOCATE, - (TSTR("yaffs: Could not allocate more objects" TENDSTR))); + new_objs = kmalloc(n_obj * sizeof(struct yaffs_obj), GFP_NOFS); + list = kmalloc(sizeof(struct yaffs_obj_list), GFP_NOFS); + + if (!new_objs || !list) { + kfree(new_objs); + new_objs = NULL; + kfree(list); + list = NULL; + yaffs_trace(YAFFS_TRACE_ALLOCATE, + "Could not allocate more objects"); return YAFFS_FAIL; } /* Hook them into the free list */ - for (i = 0; i < n_obj - 1; i++) { - newObjects[i].siblings.next = - (struct ylist_head *)(&newObjects[i + 1]); - } + for (i = 0; i < n_obj; i++) + list_add(&new_objs[i].siblings, &allocator->free_objs); - newObjects[n_obj - 1].siblings.next = (void *)allocator->freeObjects; - allocator->freeObjects = newObjects; - allocator->nFreeObjects += n_obj; - allocator->n_objCreated += n_obj; + allocator->n_free_objects += n_obj; + allocator->n_obj_created += n_obj; /* Now add this bunch of Objects to a list for freeing up. */ - list->objects = newObjects; - list->next = allocator->allocatedObjectList; - allocator->allocatedObjectList = list; + list->objects = new_objs; + list->next = allocator->allocated_obj_list; + allocator->allocated_obj_list = list; return YAFFS_OK; } -yaffs_obj_t *yaffs_alloc_raw_obj(yaffs_dev_t *dev) +struct yaffs_obj *yaffs_alloc_raw_obj(struct yaffs_dev *dev) { - yaffs_obj_t *obj = NULL; - yaffs_Allocator *allocator = dev->allocator; + struct yaffs_obj *obj = NULL; + struct list_head *lh; + struct yaffs_allocator *allocator = dev->allocator; - if(!allocator) { - YBUG(); + if (!allocator) { + BUG(); return obj; } /* If there are none left make more */ - if (!allocator->freeObjects) + if (list_empty(&allocator->free_objs)) yaffs_create_free_objs(dev, YAFFS_ALLOCATION_NOBJECTS); - if (allocator->freeObjects) { - obj = allocator->freeObjects; - allocator->freeObjects = - (yaffs_obj_t *) (allocator->freeObjects->siblings.next); - allocator->nFreeObjects--; + if (!list_empty(&allocator->free_objs)) { + lh = allocator->free_objs.next; + obj = list_entry(lh, struct yaffs_obj, siblings); + list_del_init(lh); + allocator->n_free_objects--; } return obj; } - -void yaffs_free_raw_obj(yaffs_dev_t *dev, yaffs_obj_t *obj) +void yaffs_free_raw_obj(struct yaffs_dev *dev, struct yaffs_obj *obj) { - yaffs_Allocator *allocator = dev->allocator; + struct yaffs_allocator *allocator = dev->allocator; - if(!allocator) - YBUG(); - else { - /* Link into the free list. */ - obj->siblings.next = (struct ylist_head *)(allocator->freeObjects); - allocator->freeObjects = obj; - allocator->nFreeObjects++; + if (!allocator) { + BUG(); + return; } + + /* Link into the free list. */ + list_add(&obj->siblings, &allocator->free_objs); + allocator->n_free_objects++; } -void yaffs_deinit_raw_tnodes_and_objs(yaffs_dev_t *dev) +void yaffs_deinit_raw_tnodes_and_objs(struct yaffs_dev *dev) { - if(dev->allocator){ - yaffs_deinit_raw_tnodes(dev); - yaffs_deinit_raw_objs(dev); - - YFREE(dev->allocator); - dev->allocator=NULL; - } else - YBUG(); + + if (!dev->allocator) { + BUG(); + return; + } + + yaffs_deinit_raw_tnodes(dev); + yaffs_deinit_raw_objs(dev); + kfree(dev->allocator); + dev->allocator = NULL; } -void yaffs_init_raw_tnodes_and_objs(yaffs_dev_t *dev) +void yaffs_init_raw_tnodes_and_objs(struct yaffs_dev *dev) { - yaffs_Allocator *allocator; - - if(!dev->allocator){ - allocator = YMALLOC(sizeof(yaffs_Allocator)); - if(allocator){ - dev->allocator = allocator; - yaffs_init_raw_tnodes(dev); - yaffs_init_raw_objs(dev); - } - } else - YBUG(); -} + struct yaffs_allocator *allocator; + if (dev->allocator) { + BUG(); + return; + } + + allocator = kmalloc(sizeof(struct yaffs_allocator), GFP_NOFS); + if (allocator) { + dev->allocator = allocator; + yaffs_init_raw_tnodes(dev); + yaffs_init_raw_objs(dev); + } +} -#endif