X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=drivers%2Fmtd%2Fmtdblock.c;h=2cef280e388c76aaf455fe49f3232596f8d40308;hb=43bc926fffd92024b46cafaf7350d669ba9ca884;hp=b7c32c242bc712ce6e0bd87e358dc33eb40a8a56;hpb=cee37fe97739d85991964371c1f3a745c00dd236;p=linux-2.6.git diff --git a/drivers/mtd/mtdblock.c b/drivers/mtd/mtdblock.c index b7c32c242..2cef280e3 100644 --- a/drivers/mtd/mtdblock.c +++ b/drivers/mtd/mtdblock.c @@ -1,27 +1,31 @@ -/* +/* * Direct MTD block device access * - * $Id: mtdblock.c,v 1.66 2004/11/25 13:52:52 joern Exp $ + * $Id: mtdblock.c,v 1.68 2005/11/07 11:14:20 gleixner Exp $ * * (C) 2000-2003 Nicolas Pitre * (C) 1999-2003 David Woodhouse */ #include -#include -#include -#include #include #include +#include +#include +#include #include +#include #include + #include #include +#include + static struct mtdblk_dev { struct mtd_info *mtd; int count; - struct semaphore cache_sem; + struct mutex cache_mutex; unsigned char *cache_data; unsigned long cache_offset; unsigned int cache_size; @@ -30,7 +34,7 @@ static struct mtdblk_dev { /* * Cache stuff... - * + * * Since typical flash erasable sectors are much larger than what Linux's * buffer cache can handle, we must implement read-modify-write on flash * sectors for each block write requests. To avoid over-erasing flash sectors @@ -44,7 +48,7 @@ static void erase_callback(struct erase_info *done) wake_up(wait_q); } -static int erase_write (struct mtd_info *mtd, unsigned long pos, +static int erase_write (struct mtd_info *mtd, unsigned long pos, int len, const char *buf) { struct erase_info erase; @@ -102,18 +106,18 @@ static int write_cached_data (struct mtdblk_dev *mtdblk) return 0; DEBUG(MTD_DEBUG_LEVEL2, "mtdblock: writing cached data for \"%s\" " - "at 0x%lx, size 0x%x\n", mtd->name, + "at 0x%lx, size 0x%x\n", mtd->name, mtdblk->cache_offset, mtdblk->cache_size); - - ret = erase_write (mtd, mtdblk->cache_offset, + + ret = erase_write (mtd, mtdblk->cache_offset, mtdblk->cache_size, mtdblk->cache_data); if (ret) return ret; /* * Here we could argubly set the cache state to STATE_CLEAN. - * However this could lead to inconsistency since we will not - * be notified if this content is altered on the flash by other + * However this could lead to inconsistency since we will not + * be notified if this content is altered on the flash by other * means. Let's declare it empty and leave buffering tasks to * the buffer cache instead. */ @@ -122,7 +126,7 @@ static int write_cached_data (struct mtdblk_dev *mtdblk) } -static int do_cached_write (struct mtdblk_dev *mtdblk, unsigned long pos, +static int do_cached_write (struct mtdblk_dev *mtdblk, unsigned long pos, int len, const char *buf) { struct mtd_info *mtd = mtdblk->mtd; @@ -132,7 +136,7 @@ static int do_cached_write (struct mtdblk_dev *mtdblk, unsigned long pos, DEBUG(MTD_DEBUG_LEVEL2, "mtdblock: write on \"%s\" at 0x%lx, size 0x%x\n", mtd->name, pos, len); - + if (!sect_size) return MTD_WRITE (mtd, pos, len, &retlen, buf); @@ -140,11 +144,11 @@ static int do_cached_write (struct mtdblk_dev *mtdblk, unsigned long pos, unsigned long sect_start = (pos/sect_size)*sect_size; unsigned int offset = pos - sect_start; unsigned int size = sect_size - offset; - if( size > len ) + if( size > len ) size = len; if (size == sect_size) { - /* + /* * We are covering a whole sector. Thus there is no * need to bother with the cache while it may still be * useful for other partial writes. @@ -158,7 +162,7 @@ static int do_cached_write (struct mtdblk_dev *mtdblk, unsigned long pos, if (mtdblk->cache_state == STATE_DIRTY && mtdblk->cache_offset != sect_start) { ret = write_cached_data(mtdblk); - if (ret) + if (ret) return ret; } @@ -191,7 +195,7 @@ static int do_cached_write (struct mtdblk_dev *mtdblk, unsigned long pos, } -static int do_cached_read (struct mtdblk_dev *mtdblk, unsigned long pos, +static int do_cached_read (struct mtdblk_dev *mtdblk, unsigned long pos, int len, char *buf) { struct mtd_info *mtd = mtdblk->mtd; @@ -199,9 +203,9 @@ static int do_cached_read (struct mtdblk_dev *mtdblk, unsigned long pos, size_t retlen; int ret; - DEBUG(MTD_DEBUG_LEVEL2, "mtdblock: read on \"%s\" at 0x%lx, size 0x%x\n", + DEBUG(MTD_DEBUG_LEVEL2, "mtdblock: read on \"%s\" at 0x%lx, size 0x%x\n", mtd->name, pos, len); - + if (!sect_size) return MTD_READ (mtd, pos, len, &retlen, buf); @@ -209,7 +213,7 @@ static int do_cached_read (struct mtdblk_dev *mtdblk, unsigned long pos, unsigned long sect_start = (pos/sect_size)*sect_size; unsigned int offset = pos - sect_start; unsigned int size = sect_size - offset; - if (size > len) + if (size > len) size = len; /* @@ -267,12 +271,12 @@ static int mtdblock_open(struct mtd_blktrans_dev *mbd) int dev = mbd->devnum; DEBUG(MTD_DEBUG_LEVEL1,"mtdblock_open\n"); - + if (mtdblks[dev]) { mtdblks[dev]->count++; return 0; } - + /* OK, it's not open. Create cache info for it */ mtdblk = kmalloc(sizeof(struct mtdblk_dev), GFP_KERNEL); if (!mtdblk) @@ -282,7 +286,7 @@ static int mtdblock_open(struct mtd_blktrans_dev *mbd) mtdblk->count = 1; mtdblk->mtd = mtd; - init_MUTEX (&mtdblk->cache_sem); + mutex_init(&mtdblk->cache_mutex); mtdblk->cache_state = STATE_EMPTY; if ((mtdblk->mtd->flags & MTD_CAP_RAM) != MTD_CAP_RAM && mtdblk->mtd->erasesize) { @@ -291,7 +295,7 @@ static int mtdblock_open(struct mtd_blktrans_dev *mbd) } mtdblks[dev] = mtdblk; - + DEBUG(MTD_DEBUG_LEVEL1, "ok\n"); return 0; @@ -304,9 +308,9 @@ static int mtdblock_release(struct mtd_blktrans_dev *mbd) DEBUG(MTD_DEBUG_LEVEL1, "mtdblock_release\n"); - down(&mtdblk->cache_sem); + mutex_lock(&mtdblk->cache_mutex); write_cached_data(mtdblk); - up(&mtdblk->cache_sem); + mutex_unlock(&mtdblk->cache_mutex); if (!--mtdblk->count) { /* It was the last usage. Free the device */ @@ -319,15 +323,15 @@ static int mtdblock_release(struct mtd_blktrans_dev *mbd) DEBUG(MTD_DEBUG_LEVEL1, "ok\n"); return 0; -} +} static int mtdblock_flush(struct mtd_blktrans_dev *dev) { struct mtdblk_dev *mtdblk = mtdblks[dev->devnum]; - down(&mtdblk->cache_sem); + mutex_lock(&mtdblk->cache_mutex); write_cached_data(mtdblk); - up(&mtdblk->cache_sem); + mutex_unlock(&mtdblk->cache_mutex); if (mtdblk->mtd->sync) mtdblk->mtd->sync(mtdblk->mtd);