Messages in this thread Patch in this message | | | Subject | Re: cifs hang patch idea - reduce sendtimeo on socket | From | Dave Kleikamp <> | Date | Wed, 22 Feb 2006 15:35:00 -0600 |
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On Thu, 2006-02-16 at 21:56 +0100, Adrian Bunk wrote: > > I'm a bit lost now, but I hope this information helps you in finding > what is going wrong?
Steve and I think we have figured this out. In some cases, CIFSSMBRead was returning a recently freed buffer.
CIFS: CIFSSMBRead was returning an invalid pointer in buf
Thanks to Adrian Bunk for debugging the problem
Also added a fix for 64K pages we found in loosely-related testing
Signed-off-by: Dave Kleikamp <shaggy@austin.ibm.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c index 38ab9f6..9d7bbd2 100644 --- a/fs/cifs/cifssmb.c +++ b/fs/cifs/cifssmb.c @@ -1076,13 +1076,14 @@ CIFSSMBRead(const int xid, struct cifsTc cifs_small_buf_release(iov[0].iov_base); else if(resp_buf_type == CIFS_LARGE_BUFFER) cifs_buf_release(iov[0].iov_base); - } else /* return buffer to caller to free */ /* BB FIXME how do we tell caller if it is not a large buffer */ { - *buf = iov[0].iov_base; + } else if(resp_buf_type != CIFS_NO_BUFFER) { + /* return buffer to caller to free */ + *buf = iov[0].iov_base; if(resp_buf_type == CIFS_SMALL_BUFFER) *pbuf_type = CIFS_SMALL_BUFFER; else if(resp_buf_type == CIFS_LARGE_BUFFER) *pbuf_type = CIFS_LARGE_BUFFER; - } + } /* else no valid buffer on return - leave as null */ /* Note: On -EAGAIN error only caller can retry on handle based calls since file handle passed in no longer valid */ diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c index 0e1560a..16535b5 100644 --- a/fs/cifs/connect.c +++ b/fs/cifs/connect.c @@ -1795,10 +1795,10 @@ cifs_mount(struct super_block *sb, struc conjunction with 52K kvec constraint on arch with 4K page size */ - if(cifs_sb->rsize < PAGE_CACHE_SIZE) { - cifs_sb->rsize = PAGE_CACHE_SIZE; - /* Windows ME does this */ - cFYI(1,("Attempt to set readsize for mount to less than one page (4096)")); + if(cifs_sb->rsize < 2048) { + cifs_sb->rsize = 2048; + /* Windows ME may prefer this */ + cFYI(1,("readsize set to minimum 2048")); } cifs_sb->mnt_uid = volume_info.linux_uid; cifs_sb->mnt_gid = volume_info.linux_gid; -- David Kleikamp IBM Linux Technology Center
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