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fs/fat: split out helper to init fsdata

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Want to re-use this in fat dirent iterator in next patch.

Signed-off-by: Rob Clark <robdclark@gmail.com>
Reviewed-by: Łukasz Majewski <lukma@denx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Rob Clark 2017-09-09 13:15:52 -04:00 committed by Tom Rini
parent 1c7b5d0309
commit 45449980f8
2 changed files with 44 additions and 30 deletions
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73
fs/fat/fat.c
View File

@ -808,35 +808,17 @@ exit:
return ret;
}
__u8 do_fat_read_at_block[MAX_CLUSTSIZE]
__aligned(ARCH_DMA_MINALIGN);
int do_fat_read_at(const char *filename, loff_t pos, void *buffer,
loff_t maxsize, int dols, int dogetsize, loff_t *size)
static int get_fs_info(fsdata *mydata)
{
char fnamecopy[2048];
boot_sector bs;
volume_info volinfo;
fsdata datablock;
fsdata *mydata = &datablock;
dir_entry *dentptr = NULL;
__u16 prevcksum = 0xffff;
char *subname = "";
__u32 cursect;
int idx, isdir = 0;
int files = 0, dirs = 0;
int ret = -1;
int firsttime;
__u32 root_cluster = 0;
__u32 read_blk;
int rootdir_size = 0;
int buffer_blk_cnt;
int do_read;
__u8 *dir_ptr;
int ret;
if (read_bootsectandvi(&bs, &volinfo, &mydata->fatsize)) {
ret = read_bootsectandvi(&bs, &volinfo, &mydata->fatsize);
if (ret) {
debug("Error: reading boot sector\n");
return -1;
return ret;
}
if (mydata->fatsize == 32) {
@ -848,8 +830,7 @@ int do_fat_read_at(const char *filename, loff_t pos, void *buffer,
mydata->fat_sect = bs.reserved;
cursect = mydata->rootdir_sect
= mydata->fat_sect + mydata->fatlength * bs.fats;
mydata->rootdir_sect = mydata->fat_sect + mydata->fatlength * bs.fats;
mydata->sect_size = (bs.sector_size[1] << 8) + bs.sector_size[0];
mydata->clust_size = bs.cluster_size;
@ -863,12 +844,12 @@ int do_fat_read_at(const char *filename, loff_t pos, void *buffer,
mydata->data_begin = mydata->rootdir_sect -
(mydata->clust_size * 2);
} else {
rootdir_size = ((bs.dir_entries[1] * (int)256 +
bs.dir_entries[0]) *
sizeof(dir_entry)) /
mydata->sect_size;
mydata->rootdir_size = ((bs.dir_entries[1] * (int)256 +
bs.dir_entries[0]) *
sizeof(dir_entry)) /
mydata->sect_size;
mydata->data_begin = mydata->rootdir_sect +
rootdir_size -
mydata->rootdir_size -
(mydata->clust_size * 2);
}
@ -893,6 +874,38 @@ int do_fat_read_at(const char *filename, loff_t pos, void *buffer,
debug("Sector size: %d, cluster size: %d\n", mydata->sect_size,
mydata->clust_size);
return 0;
}
__u8 do_fat_read_at_block[MAX_CLUSTSIZE]
__aligned(ARCH_DMA_MINALIGN);
int do_fat_read_at(const char *filename, loff_t pos, void *buffer,
loff_t maxsize, int dols, int dogetsize, loff_t *size)
{
char fnamecopy[2048];
fsdata datablock;
fsdata *mydata = &datablock;
dir_entry *dentptr = NULL;
__u16 prevcksum = 0xffff;
char *subname = "";
__u32 cursect;
int idx, isdir = 0;
int files = 0, dirs = 0;
int ret = -1;
int firsttime;
__u32 root_cluster = 0;
__u32 read_blk;
int rootdir_size = 0;
int buffer_blk_cnt;
int do_read;
__u8 *dir_ptr;
if (get_fs_info(mydata))
return -1;
cursect = mydata->rootdir_sect;
/* "cwd" is always the root... */
while (ISDIRDELIM(*filename))
filename++;

1
include/fat.h
View File

@ -174,6 +174,7 @@ typedef struct {
__u16 clust_size; /* Size of clusters in sectors */
int data_begin; /* The sector of the first cluster, can be negative */
int fatbufnum; /* Used by get_fatent, init to -1 */
int rootdir_size; /* Size of root dir for non-FAT32 */
} fsdata;
typedef int (file_detectfs_func)(void);