CVS commit: src/sys/fs/smbfs

[Christos Zoulas <christos%netbsd.org@localhost>]

Module Name:    src
Committed By:   christos
Date:           Mon Aug 28 15:56:56 UTC 2006

Modified Files:
        src/sys/fs/smbfs: smbfs_smb.c

Log Message:
Fix getdirentries() issue from FreeBSD PR - 78953 Quoting from that:

If you perform this request on a directory with exactly 50 files
(plus '.' and '..' which brings the total to 52 objects), the first
reply for the SMB server completely satisfies the query (server
side is Windows 2000 Professional).

The smbfs client then performs a TRANS2_FIND_NEXT2 using the last
file name as the resume key.  The response returns a SearchCount
of zero (ctx->f_ecnt == 0) and an EndOfSearch code of zero.

Any attempt to get more entries with calls to TRANS2_FIND_NEXT2
result in Badfid (bad file descriptor).  I suspect the return of
SearchCount of zero means that end-of-search has been reached and
the Sid is now closed.

The solution is to set "SMB_RDD_EOF | SMB_RDD_NOCLOSE" after getting
back a zero SearchCount,  I've tested this in the field on a quite
a few systems, aggressively accessing Windows shares over smbfs
and it appears flawless.

I was initially concerned about the possibility of resource exhaustion
on the Windows server. I was afraid by not officially closing the
search, it would leave a resource hung-up and over time, exhaust
some sort of "open search table" limit.  I've since convinced myself
this is NOT the case.

Windows needs to be able to handle clients that come and go over
time.  If the search is not closed, Windows will close it if it
finds it needs more resources.  I've testing this on directory
searches descending into 10's of thousands of folders, with 100's
of thousands of files.


To generate a diff of this commit:
cvs rdiff -r1.30 -r1.31 src/sys/fs/smbfs/smbfs_smb.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.