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fs: fat: extend get_fs_info() for write use

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get_fs_info() was introduced in major re-work of read operation by Rob.
We want to reuse this function in write operation by extending it with
additional members in fsdata structure.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
AKASHI Takahiro 2018-09-11 15:58:58 +09:00 committed by Alexander Graf
parent 14d103bb27
commit f23101f951
2 changed files with 9 additions and 0 deletions
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7
fs/fat/fat.c
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@ -558,10 +558,17 @@ 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;

2
include/fat.h
View File

@ -173,6 +173,8 @@ typedef struct {
int fatbufnum; /* Used by get_fatent, init to -1 */
int rootdir_size; /* Size of root dir for non-FAT32 */
__u32 root_cluster; /* First cluster of root dir for FAT32 */
u32 total_sect; /* Number of sectors */
int fats; /* Number of FATs */
} fsdata;
static inline u32 clust_to_sect(fsdata *fsdata, u32 clust)