| Message ID | 20190916122417.27520-2-m.szyprowski@samsung.com |
|---|---|
| State | Superseded |
| Delegated to: | Tom Rini |
| Headers | show |
| Series | Raspberry Pi4: add support for DFU over USB | expand |
On Mon, Sep 16, 2019 at 3:25 PM Marek Szyprowski <m.szyprowski@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.szyprowski@samsung.com> Reviewed-by: Oleksandr Suvorov <oleksandr.suvorov@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
Hi Marek, > 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.szyprowski@samsung.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; Reviewed-by: Lukasz Majewski <lukma@denx.de> Best regards, Lukasz Majewski -- DENX Software Engineering GmbH, Managing Director: Wolfgang Denk HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: (+49)-8142-66989-59 Fax: (+49)-8142-66989-80 Email: lukma@denx.de
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;
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.szyprowski@samsung.com> --- fs/fat/fat_write.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)