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fs/fat: reduce data size for FAT_WRITE 

Allocated tmpbuf_cluster dynamically to reduce the data size added by
compiling with CONFIG_FAT_WRITE.

Reported-by: Tom Rini <trini@konsulko.com>
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This commit is contained in:
Heinrich Schuchardt 2020-07-06 07:48:14 +02:00
parent a27c78fddb
commit 5a8d1f60b2
1 changed files with 7 additions and 2 deletions
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9
fs/fat/fat_write.c
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@ -500,8 +500,6 @@ flush_dir(fat_itr *itr)
nsects * mydata->sect_size);
}
static __u8 tmpbuf_cluster[MAX_CLUSTSIZE] __aligned(ARCH_DMA_MINALIGN);
/*
* Read and modify data on existing and consecutive cluster blocks
*/
@ -509,6 +507,7 @@ static int
get_set_cluster(fsdata *mydata, __u32 clustnum, loff_t pos, __u8 *buffer,
loff_t size, loff_t *gotsize)
{
static u8 *tmpbuf_cluster;
unsigned int bytesperclust = mydata->clust_size * mydata->sect_size;
__u32 startsect;
loff_t wsize;
@ -518,6 +517,12 @@ get_set_cluster(fsdata *mydata, __u32 clustnum, loff_t pos, __u8 *buffer,
if (!size)
return 0;
if (!tmpbuf_cluster) {
tmpbuf_cluster = memalign(ARCH_DMA_MINALIGN, MAX_CLUSTSIZE);
if (!tmpbuf_cluster)
return -1;
}
assert(pos < bytesperclust);
startsect = clust_to_sect(mydata, clustnum);