The recent fsx fixes has a logic error in the offset trimming code.
If a read is done when the file size is zero, then the logic error
causes a offset % 0 opertaion to occur. This causes fsx to get a
SIGFPE and die.
This was not discovered during my testing because I was using a
random seed that didn't trip this condition. Changing the seed to
that which test 091 uses (the default of 1) causes such an operation
to occur....
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
}
}
-#define TRIM_OFF_LEN(off, len, size, zero_offset) \
-do { \
- if (!zero_offset || file_size) \
- offset %= size; \
- else \
- offset = 0; \
- if (offset + len > size) \
- len = size - offset; \
+#define TRIM_OFF_LEN(off, len, size, allow_zero_file_size) \
+do { \
+ if (allow_zero_file_size || file_size) \
+ offset %= size; \
+ else \
+ offset = 0; \
+ if (offset + len > size) \
+ len = size - offset; \
} while (0)
void