| Message ID | 20090210103354.GA8405@www.tglx.de |
|---|---|
| State | New, archived |
| Headers | show |
On Tue, 2009-02-10 at 11:33 +0100, Sebastian Andrzej Siewior wrote: > diff --git a/ubi-utils/new-utils/src/libmtd.c b/ubi-utils/new-utils/src/libmtd.c > index aab4b0e..69705dd 100644 > --- a/ubi-utils/new-utils/src/libmtd.c > +++ b/ubi-utils/new-utils/src/libmtd.c > @@ -189,7 +189,7 @@ int mtd_is_bad(const struct mtd_info *mtd, int eb) > if (!mtd->allows_bb) > return 0; > > - seek = eb * mtd->eb_size; > + seek = (unsigned int)eb * mtd->eb_size; I believe this should be: seek = (off_t)eb * mtd->eb_size; instead.
Artem Bityutskiy wrote: > On Tue, 2009-02-10 at 11:33 +0100, Sebastian Andrzej Siewior wrote: >> diff --git a/ubi-utils/new-utils/src/libmtd.c b/ubi-utils/new-utils/src/libmtd.c >> index aab4b0e..69705dd 100644 >> --- a/ubi-utils/new-utils/src/libmtd.c >> +++ b/ubi-utils/new-utils/src/libmtd.c >> @@ -189,7 +189,7 @@ int mtd_is_bad(const struct mtd_info *mtd, int eb) >> if (!mtd->allows_bb) >> return 0; >> >> - seek = eb * mtd->eb_size; >> + seek = (unsigned int)eb * mtd->eb_size; > > I believe this should be: > > seek = (off_t)eb * mtd->eb_size; > > instead. Yes, indeed. > Sebastian
diff --git a/common.mk b/common.mk index 77d28bf..65fc1cc 100644 --- a/common.mk +++ b/common.mk @@ -2,7 +2,7 @@ CC := $(CROSS)gcc AR := $(CROSS)ar RANLIB := $(CROSS)ranlib CFLAGS ?= -O2 -g -CFLAGS += -Wall -Wwrite-strings -W +CFLAGS += -Wall -Wwrite-strings -W -D_FILE_OFFSET_BITS=64 DESTDIR ?= /usr/local PREFIX=/usr diff --git a/ubi-utils/new-utils/src/libmtd.c b/ubi-utils/new-utils/src/libmtd.c index aab4b0e..69705dd 100644 --- a/ubi-utils/new-utils/src/libmtd.c +++ b/ubi-utils/new-utils/src/libmtd.c @@ -189,7 +189,7 @@ int mtd_is_bad(const struct mtd_info *mtd, int eb) if (!mtd->allows_bb) return 0; - seek = eb * mtd->eb_size; + seek = (unsigned int)eb * mtd->eb_size; ret = ioctl(mtd->fd, MEMGETBADBLOCK, &seek); if (ret == -1) { sys_errmsg("MEMGETBADBLOCK ioctl failed for " @@ -231,7 +231,7 @@ int mtd_read(const struct mtd_info *mtd, int eb, int offs, void *buf, int len) } /* Seek to the beginning of the eraseblock */ - seek = eb * mtd->eb_size + offs; + seek = (unsigned int)eb * mtd->eb_size + offs; if (lseek(mtd->fd, seek, SEEK_SET) != seek) { sys_errmsg("cannot seek mtd%d to offset %llu", mtd->num, (unsigned long long)seek); @@ -296,7 +296,7 @@ int mtd_write(const struct mtd_info *mtd, int eb, int offs, void *buf, int len) #endif /* Seek to the beginning of the eraseblock */ - seek = eb * mtd->eb_size + offs; + seek = (unsigned int)eb * mtd->eb_size + offs; if (lseek(mtd->fd, seek, SEEK_SET) != seek) { sys_errmsg("cannot seek mtd%d to offset %llu", mtd->num, (unsigned long long)seek);
I have here a mtd part which is 3 GiB with a flash page size of 256KiB. The 2GiB limit is at erase block 8192. In mtd_is_bad() the computation for the MEMGETBADBLOCK ioctl() looks like the following: | seek = eb * mtd->eb_size; with both eb and mtd->eb_size being a signed int results in seek being a signed result. Therefore I cast them to int as Artem suggested. The _FILE_OFFSET_BITS=64 define is required to switch off_t from 32bit to 64bit an 32bit systems. This is required in order to keep using lseek() as lseek64 on 32bit system. Without this change lseek() in mtd_read() is called with a 32bit value with most significat bit set and the kernel performs a sign extension for the 64bit value which is used in the mtd layer. The last change also changes the size of the parameter which is passed to the MEMGETBADBLOCK ioctl() from 32 to 64bit. The counter part in kernel is also defined as loff_t which is of type __kernel_loff_t and this is "long long". So this must have been broken for a while unless I missed something. Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> --- That's a tiny one. Just flashed and it works. Hope that is what you had in mind. common.mk | 2 +- ubi-utils/new-utils/src/libmtd.c | 6 +++--- 2 files changed, 4 insertions(+), 4 deletions(-)