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[/] [openrisc/] [trunk/] [rtos/] [ecos-2.0/] [packages/] [io/] [fileio/] [v2_0/] [src/] [inocache.cxx] - Rev 308
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//============================================================================= // // inocache.cxx // // Implementation of inode cache // //============================================================================= //####ECOSGPLCOPYRIGHTBEGIN#### // ------------------------------------------- // This file is part of eCos, the Embedded Configurable Operating System. // Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc. // // eCos is free software; you can redistribute it and/or modify it under // the terms of the GNU General Public License as published by the Free // Software Foundation; either version 2 or (at your option) any later version. // // eCos is distributed in the hope that it will be useful, but WITHOUT ANY // WARRANTY; without even the implied warranty of MERCHANTABILITY or // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License // for more details. // // You should have received a copy of the GNU General Public License along // with eCos; if not, write to the Free Software Foundation, Inc., // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. // // As a special exception, if other files instantiate templates or use macros // or inline functions from this file, or you compile this file and link it // with other works to produce a work based on this file, this file does not // by itself cause the resulting work to be covered by the GNU General Public // License. However the source code for this file must still be made available // in accordance with section (3) of the GNU General Public License. // // This exception does not invalidate any other reasons why a work based on // this file might be covered by the GNU General Public License. // // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc. // at http://sources.redhat.com/ecos/ecos-license/ // ------------------------------------------- //####ECOSGPLCOPYRIGHTEND#### //============================================================================= //#####DESCRIPTIONBEGIN#### // // Author(s): jlarmour // Contributors: // Date: 2002-01-18 // Purpose: // Description: // Usage: // #include <cyg/fileio/inode.h> // ... // // //####DESCRIPTIONEND#### // //============================================================================= #include <pkgconf/system.h> #include <cyg/infra/cyg_type.h> #include <stdlib.h> #include <cyg/fileio/inode.h> #ifdef CYGPKG_KERNEL # include <pkgconf/kernel.h> # include <cyg/kernel/mutex.hxx> # if 0 # define LOCK_ICACHE(_ic_) \ CYG_MACRO_START \ (_ic_)->icmutex.lock(); \ CYG_MACRO_END # define UNLOCK_ICACHE(_ic_) \ CYG_MACRO_START \ (_ic_)->icmutex.unlock(); \ CYG_MACRO_END # define LOCK_INO(_ic_,_ino_) \ CYG_MACRO_START \ (_ic_)->icmutex.lock(); \ CYG_MACRO_END # define UNLOCK_INO(_ic_,_ino_) \ CYG_MACRO_START \ (_ic_)->icmutex.unlock(); \ CYG_MACRO_END # endif #endif # define LOCK_ICACHE(_ic_) CYG_EMPTY_STATEMENT # define UNLOCK_ICACHE(_ic_) CYG_EMPTY_STATEMENT # define LOCK_INO(_ic_,_ino_) CYG_EMPTY_STATEMENT # define UNLOCK_INO(_ic_,_ino_) CYG_EMPTY_STATEMENT // Tried to make this implementation use tables, but the requirement to // allow for extra space makes this difficult __externC void cyg_inodecache_destroy( cyg_inodecache *ic ) { cyg_inode *tmp; for ( tmp=ic->head; tmp != NULL; tmp=tmp->i_cache_next ) free(tmp); #if CYGNUM_IO_FILEIO_MAX_INODE_CACHE_DEAD > 0 for ( tmp=ic->freeable; tmp != NULL; tmp=tmp->i_cache_next ) free(tmp); #endif } // cyg_inodecache_destroy() static __inline__ void insert_in_list( cyg_inode **i, cyg_inode *ino ) { cyg_inode *here = *i; if ( here == NULL ) { ino->i_cache_prev = ino->i_cache_next = ino; } else { ino->i_cache_prev = here->i_cache_prev; ino->i_cache_next = here; here->i_cache_prev = ino; ino->i_cache_prev->i_cache_next = ino; } // put at start, as this is more likely to come off sooner than later *i = ino; } // Create an inode. Returns a negative error code on error. __externC cyg_inode * cyg_inode_create( cyg_inodecache *ic ) { cyg_inode *ni; ni = (cyg_inode *)malloc( sizeof(cyg_inode)+ic->privatespace ); if ( !ni ) return ni; ni->i_count = 1; LOCK_ICACHE(ic); insert_in_list( &ic->head, ni ); UNLOCK_ICACHE(ic); return ni; } // cyg_inode_create() __externC cyg_inode * cyg_inode_get( cyg_inodecache *ic, cyg_uint32 ino ) { cyg_inode *head = ic->head; // first try the (live) cache if (head) { cyg_inode *tmp=head; while (1) { if ( tmp->i_ino == ino ) { tmp->i_count++; return tmp; } tmp = tmp->i_cache_next; if ( tmp == head ) break; } } #if CYGNUM_IO_FILEIO_MAX_INODE_CACHE_DEAD > 0 // now try the cache of dead inodes head = ic->freeable; if (head) { cyg_inode *tmp=head; while (1) { if ( tmp->i_ino == ino ) { tmp->i_count++; LOCK_ICACHE(ic); ic->freeablelistlen--; if ( ic->freeablelistlen ) { tmp->i_cache_prev->i_cache_next = tmp->i_cache_next; tmp->i_cache_next->i_cache_prev = tmp->i_cache_prev; } else ic->freeable = NULL; insert_in_list( &ic->head, tmp ); UNLOCK_ICACHE(ic); return tmp; } tmp = tmp->i_cache_next; if ( tmp == head ) break; } } #endif // not found so make it return cyg_inode_create( ic ); } // cyg_inode_get() __externC void cyg_inode_put( cyg_inodecache *ic, cyg_inode *ino ) { if ( --ino->i_count == 0 ) { LOCK_ICACHE(ic); if ( ino->i_cache_next == ino ) { ic->head = NULL; } else { ino->i_cache_prev->i_cache_next = ino->i_cache_next; ino->i_cache_next->i_cache_prev = ino->i_cache_prev; } #if CYGNUM_IO_FILEIO_MAX_INODE_CACHE_DEAD > 0 ic->freeablelistlen++; insert_in_list( &ic->freeable, ino ); if ( ic->freeablelistlen > CYGNUM_IO_FILEIO_MAX_INODE_CACHE_DEAD ) { cyg_inode *prev = ino->i_cache_prev; prev->i_cache_prev->i_cache_next = ino; ino->i_cache_prev = prev->i_cache_prev; ic->freecallback(prev); free(prev); } #else ic->freecallback(ino); free(ino); #endif } } // cyg_inode_put() // EOF inode.h
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