Date: Tue, 7 Aug 2007 10:35:27 +0000 (UTC) From: Bruce Evans <bde@FreeBSD.org> To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/sys/fs/msdosfs msdosfs_vnops.c Message-ID: <200708071035.l77AZR3v049422@repoman.freebsd.org>
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bde 2007-08-07 10:35:27 UTC FreeBSD src repository Modified files: sys/fs/msdosfs msdosfs_vnops.c Log: In msdosfs_read() and msdosfs_write(), don't check explicitly for (uio_offset < 0) since this can't happen. If this happens, then the general code handles the problem safely (better than before for reading, returning 0 (EOF) instead of the bogus errno EINVAL, and the same as before for writing, returning EFBIG). In msdosfs_read(), don't check for (uio_resid < 0). msdosfs_write() already didn't check. In msdosfs_read(), document in a comment our assumptions that the caller passed a valid uio_offset and uio_resid. ffs checks using KASSERT(), and that is enough sanity checking. In the same comment, partly document there is no need to check for the EOVERFLOW case, unlike in ffs where this case can happen at least in theory. In msdosfs_write(), add a comment about why the checking of (uio_resid == 0) is explicit, unlike in ffs. In msdosfs_write(), check for impossibly large final offsets before checking if the file size rlimit would be exceeded, so that we don't have an overflow bug in the rlimit check and are consistent with ffs. We now return EFBIG instead of EFBIG plus a SIGXFSZ signal if the final offset would be impossibly large but not so large as to cause overflow. Overflow normally gave the benign behaviour of no signal. Approved by: re (kensmith) (blanket) Revision Changes Path 1.178 +21 -12 src/sys/fs/msdosfs/msdosfs_vnops.c
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