X-Git-Url: http://review.tizen.org/git/?a=blobdiff_plain;f=fs%2Ffat%2Ffat.c;h=ac8913e71929b1a847d09fdc1d69552f72afc962;hb=10d3e90f46feace58f4141b696d91644e594e3ed;hp=d16883fa10d4af14be4391c33944dbc7d2a65c13;hpb=b55c89ce0207d3a504238c1b8f268c56035656a3;p=platform%2Fkernel%2Fu-boot.git diff --git a/fs/fat/fat.c b/fs/fat/fat.c index d16883f..ac8913e 100644 --- a/fs/fat/fat.c +++ b/fs/fat/fat.c @@ -1,3 +1,4 @@ +// SPDX-License-Identifier: GPL-2.0+ /* * fat.c * @@ -5,8 +6,6 @@ * * 2002-07-28 - rjones@nexus-tech.net - ported to ppcboot v1.1.6 * 2003-03-10 - kharris@nexus-tech.net - ported to uboot - * - * SPDX-License-Identifier: GPL-2.0+ */ #include @@ -22,12 +21,6 @@ #include #include -#ifdef CONFIG_SUPPORT_VFAT -static const int vfat_enabled = 1; -#else -static const int vfat_enabled = 0; -#endif - /* * Convert a string to lowercase. Converts at most 'len' characters, * 'len' may be larger than the length of 'str' if 'str' is NULL @@ -267,7 +260,7 @@ get_cluster(fsdata *mydata, __u32 clustnum, __u8 *buffer, unsigned long size) if ((unsigned long)buffer & (ARCH_DMA_MINALIGN - 1)) { ALLOC_CACHE_ALIGN_BUFFER(__u8, tmpbuf, mydata->sect_size); - printf("FAT: Misaligned buffer address (%p)\n", buffer); + debug("FAT: Misaligned buffer address (%p)\n", buffer); while (size >= mydata->sect_size) { ret = disk_read(startsect++, 1, tmpbuf); @@ -472,15 +465,6 @@ static __u8 mkcksum(const char name[8], const char ext[3]) } /* - * TODO these should go away once fat_write is reworked to use the - * directory iterator - */ -__u8 get_dentfromdir_block[MAX_CLUSTSIZE] - __aligned(ARCH_DMA_MINALIGN); -__u8 do_fat_read_at_block[MAX_CLUSTSIZE] - __aligned(ARCH_DMA_MINALIGN); - -/* * Read boot sector and volume info from a FAT filesystem */ static int @@ -565,10 +549,17 @@ static int get_fs_info(fsdata *mydata) if (mydata->fatsize == 32) { mydata->fatlength = bs.fat32_length; + mydata->total_sect = bs.total_sect; } else { mydata->fatlength = bs.fat_length; + mydata->total_sect = (bs.sectors[1] << 8) + bs.sectors[0]; + if (!mydata->total_sect) + mydata->total_sect = bs.total_sect; } + if (!mydata->total_sect) /* unlikely */ + mydata->total_sect = (u32)cur_part_info.size; + mydata->fats = bs.fats; mydata->fat_sect = bs.reserved; mydata->rootdir_sect = mydata->fat_sect + mydata->fatlength * bs.fats; @@ -580,6 +571,17 @@ static int get_fs_info(fsdata *mydata) mydata->sect_size, cur_part_info.blksz); return -1; } + if (mydata->clust_size == 0) { + printf("Error: FAT cluster size not set\n"); + return -1; + } + if ((unsigned int)mydata->clust_size * mydata->sect_size > + MAX_CLUSTSIZE) { + printf("Error: FAT cluster size too big (cs=%u, max=%u)\n", + (unsigned int)mydata->clust_size * mydata->sect_size, + MAX_CLUSTSIZE); + return -1; + } if (mydata->fatsize == 32) { mydata->data_begin = mydata->rootdir_sect - @@ -605,9 +607,6 @@ static int get_fs_info(fsdata *mydata) return -1; } - if (vfat_enabled) - debug("VFAT Support enabled\n"); - debug("FAT%d, fat_sect: %d, fatlength: %d\n", mydata->fatsize, mydata->fat_sect, mydata->fatlength); debug("Rootdir begins at cluster: %d, sector: %d, offset: %x\n" @@ -643,7 +642,9 @@ static int get_fs_info(fsdata *mydata) typedef struct { fsdata *fsdata; /* filesystem parameters */ + unsigned start_clust; /* first cluster */ unsigned clust; /* current cluster */ + unsigned next_clust; /* next cluster if remaining == 0 */ int last_cluster; /* set once we've read last cluster */ int is_root; /* is iterator at root directory */ int remaining; /* remaining dent's in current cluster */ @@ -674,7 +675,9 @@ static int fat_itr_root(fat_itr *itr, fsdata *fsdata) return -ENXIO; itr->fsdata = fsdata; + itr->start_clust = 0; itr->clust = fsdata->root_cluster; + itr->next_clust = fsdata->root_cluster; itr->dent = NULL; itr->remaining = 0; itr->last_cluster = 0; @@ -708,11 +711,14 @@ static void fat_itr_child(fat_itr *itr, fat_itr *parent) assert(fat_itr_isdir(parent)); itr->fsdata = parent->fsdata; + itr->start_clust = clustnum; if (clustnum > 0) { itr->clust = clustnum; + itr->next_clust = clustnum; itr->is_root = 0; } else { itr->clust = parent->fsdata->root_cluster; + itr->next_clust = parent->fsdata->root_cluster; itr->is_root = 1; } itr->dent = NULL; @@ -730,7 +736,10 @@ static void *next_cluster(fat_itr *itr) if (itr->last_cluster) return NULL; - sect = clust_to_sect(itr->fsdata, itr->clust); + if (itr->fsdata->fatsize != 32 && itr->is_root) + sect = mydata->rootdir_sect; + else + sect = clust_to_sect(itr->fsdata, itr->next_clust); debug("FAT read(sect=%d), clust_size=%d, DIRENTSPERBLOCK=%zd\n", sect, itr->fsdata->clust_size, DIRENTSPERBLOCK); @@ -751,18 +760,19 @@ static void *next_cluster(fat_itr *itr) return NULL; } + itr->clust = itr->next_clust; if (itr->is_root && itr->fsdata->fatsize != 32) { - itr->clust++; - sect = clust_to_sect(itr->fsdata, itr->clust); + itr->next_clust++; + sect = clust_to_sect(itr->fsdata, itr->next_clust); if (sect - itr->fsdata->rootdir_sect >= itr->fsdata->rootdir_size) { - debug("cursect: 0x%x\n", itr->clust); + debug("nextclust: 0x%x\n", itr->next_clust); itr->last_cluster = 1; } } else { - itr->clust = get_fatent(itr->fsdata, itr->clust); - if (CHECK_CLUST(itr->clust, itr->fsdata->fatsize)) { - debug("cursect: 0x%x\n", itr->clust); + itr->next_clust = get_fatent(itr->fsdata, itr->next_clust); + if (CHECK_CLUST(itr->next_clust, itr->fsdata->fatsize)) { + debug("nextclust: 0x%x\n", itr->next_clust); itr->last_cluster = 1; } } @@ -778,8 +788,11 @@ static dir_entry *next_dent(fat_itr *itr) itr->fsdata->clust_size; /* have we reached the last cluster? */ - if (!dent) + if (!dent) { + /* a sign for no more entries left */ + itr->dent = NULL; return NULL; + } itr->remaining = nbytes / sizeof(dir_entry) - 1; itr->dent = dent; @@ -808,6 +821,9 @@ static dir_entry *extract_vfat_name(fat_itr *itr) slot2str((dir_slot *)dent, buf, &idx); + if (n + idx >= sizeof(itr->l_name)) + return NULL; + /* shift accumulated long-name up and copy new part in: */ memmove(itr->l_name + idx, itr->l_name, n); memcpy(itr->l_name, buf, idx); @@ -857,8 +873,7 @@ static int fat_itr_next(fat_itr *itr) continue; if (dent->attr & ATTR_VOLUME) { - if (vfat_enabled && - (dent->attr & ATTR_VFAT) == ATTR_VFAT && + if ((dent->attr & ATTR_VFAT) == ATTR_VFAT && (dent->name[0] & LAST_LONG_ENTRY_MASK)) { dent = extract_vfat_name(itr); if (!dent) @@ -935,6 +950,28 @@ static int fat_itr_resolve(fat_itr *itr, const char *path, unsigned type) while (next[0] && !ISDIRDELIM(next[0])) next++; + if (itr->is_root) { + /* root dir doesn't have "." nor ".." */ + if ((((next - path) == 1) && !strncmp(path, ".", 1)) || + (((next - path) == 2) && !strncmp(path, "..", 2))) { + /* point back to itself */ + itr->clust = itr->fsdata->root_cluster; + itr->next_clust = itr->fsdata->root_cluster; + itr->dent = NULL; + itr->remaining = 0; + itr->last_cluster = 0; + + if (next[0] == 0) { + if (type & TYPE_DIR) + return 0; + else + return -ENOENT; + } + + return fat_itr_resolve(itr, next, type); + } + } + while (fat_itr_next(itr)) { int match = 0; unsigned n = max(strlen(itr->name), (size_t)(next - path)); @@ -1106,7 +1143,7 @@ int file_fat_read_at(const char *filename, loff_t pos, void *buffer, if (ret) goto out_free_both; - printf("reading %s\n", filename); + debug("reading %s at pos %llu\n", filename, pos); ret = get_contents(&fsdata, itr->dent, pos, buffer, maxsize, actread); out_free_both: