On Mon, Sep 16, 2019 at 3:25 PM Marek Szyprowski <m.szyprow...@samsung.com> wrote: > > The code for handing file overwrite incorrectly assumed that the file on > disk is always contiguous. This resulted in corrupting disk structure > every time when write to existing fragmented file happened. Fix this > by adding proper check for cluster discontinuity and adjust chunk size > on each partial write. > > Signed-off-by: Marek Szyprowski <m.szyprow...@samsung.com>
Reviewed-by: Oleksandr Suvorov <oleksandr.suvo...@toradex.com> > --- > fs/fat/fat_write.c | 6 +++--- > 1 file changed, 3 insertions(+), 3 deletions(-) > > diff --git a/fs/fat/fat_write.c b/fs/fat/fat_write.c > index 729cf39630d..6cfa5b45652 100644 > --- a/fs/fat/fat_write.c > +++ b/fs/fat/fat_write.c > @@ -794,6 +794,8 @@ set_contents(fsdata *mydata, dir_entry *dentptr, loff_t > pos, __u8 *buffer, > > newclust = get_fatent(mydata, endclust); > > + if ((newclust - 1) != endclust) > + break; > if (IS_LAST_CLUST(newclust, mydata->fatsize)) > break; > if (CHECK_CLUST(newclust, mydata->fatsize)) { > @@ -811,7 +813,7 @@ set_contents(fsdata *mydata, dir_entry *dentptr, loff_t > pos, __u8 *buffer, > offset = 0; > else > offset = pos - cur_pos; > - wsize = min(cur_pos + actsize, filesize) - pos; > + wsize = min_t(unsigned long long, actsize, filesize - > cur_pos); > if (get_set_cluster(mydata, curclust, offset, > buffer, wsize, &actsize)) { > printf("Error get-and-setting cluster\n"); > @@ -824,8 +826,6 @@ set_contents(fsdata *mydata, dir_entry *dentptr, loff_t > pos, __u8 *buffer, > if (filesize <= cur_pos) > break; > > - /* CHECK: newclust = get_fatent(mydata, endclust); */ > - > if (IS_LAST_CLUST(newclust, mydata->fatsize)) > /* no more clusters */ > break; > -- > 2.17.1 > > _______________________________________________ > U-Boot mailing list > U-Boot@lists.denx.de > https://lists.denx.de/listinfo/u-boot -- Best regards Oleksandr Suvorov cryo...@gmail.com _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de https://lists.denx.de/listinfo/u-boot