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From: Philip Martin <philip.martin@wandisco.com>
To: Tobias Bading <tbading@web.de>
Cc: users@subversion.apache.org
Subject: Re: strange E/W200033 (b)locking error/warning when trying to modify
 a svn 1.8 working copy over SMB share
References: <533D7904.7000500@web.de>
Date: Thu, 03 Apr 2014 18:46:50 +0100
In-Reply-To: <533D7904.7000500@web.de> (Tobias Bading's message of "Thu, 03
	Apr 2014 17:06:44 +0200")
Message-ID: <87eh1epaph.fsf@ntlworld.com>
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Tobias Bading <tbading@web.de> writes:

> fcntl(3, F_SETLK, {type=F_RDLCK, whence=SEEK_SET, start=1073741824, len=1}) = 0
> fcntl(3, F_SETLK, {type=F_RDLCK, whence=SEEK_SET, start=1073741826, len=510}) = 0
> fcntl(3, F_SETLK, {type=F_UNLCK, whence=SEEK_SET, start=1073741824, len=1}) = 0

There should be a second fcntl with F_UNLCK, start=0, len=0 which
unlocks the whole file.  On my Linux system it is present whether or not
I use exclusive locking:

fcntl(3, F_SETLK, {type=F_RDLCK, whence=SEEK_SET, start=1073741824, len=1}) = 0
fcntl(3, F_SETLK, {type=F_RDLCK, whence=SEEK_SET, start=1073741826, len=510}) = 0
fcntl(3, F_SETLK, {type=F_UNLCK, whence=SEEK_SET, start=1073741824, len=1}) = 0
fcntl(3, F_SETLK, {type=F_UNLCK, whence=SEEK_SET, start=0, len=0}) = 0


> access("/smb/<path-to-share>/<wc-root>/.svn/wc.db-journal", F_OK) = -1 
> ENOENT (No such file or directory)
> fstat(3, {st_mode=S_IFREG|0600, st_size=100352, ...}) = 0
> access("/smb/<path-to-share>/<wc-root>/.svn/wc.db-wal", F_OK) = -1 
> ENOENT (No such file or directory)
> fstat(3, {st_mode=S_IFREG|0600, st_size=100352, ...}) = 0
> [...]
> fcntl(3, F_SETLK, {type=F_WRLCK, whence=SEEK_SET, start=1073741825, len=1}) = 0
> [...]
> fcntl(3, F_SETLK, {type=F_WRLCK, whence=SEEK_SET, start=1073741824, len=1}) = 0
>
> then 10 times
>
> fcntl(3, F_SETLK, {type=F_WRLCK, whence=SEEK_SET, start=1073741826, len=510}) = -1 EACCES (Permission denied)

The missing F_UNLCK means the file is still locked and so this fails.  I
don't know why SQLite is missing the F_UNLCK.

-- 
Philip Martin | Subversion Committer
WANdisco // *Non-Stop Data*