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Date: Wed, 8 Dec 2010 07:30:01 -0500 (EST)
From: "Guillaume Nodet (JIRA)" <jira@apache.org>
To: dev@mina.apache.org
Subject: [jira] Commented: (SSHD-100) [sftp] open(2) w/ O_CREAT|O_TRUNC
 works, but O_CREAT alone fails
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    [ https://issues.apache.org/jira/browse/SSHD-100?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12969290#action_12969290 ] 

Guillaume Nodet commented on SSHD-100:
--------------------------------------

Thankx  a ton for this patch!

> [sftp] open(2) w/ O_CREAT|O_TRUNC works, but O_CREAT alone fails
> ----------------------------------------------------------------
>
>                 Key: SSHD-100
>                 URL: https://issues.apache.org/jira/browse/SSHD-100
>             Project: MINA SSHD
>          Issue Type: Bug
>            Reporter: Bobby Powers
>            Assignee: Guillaume Nodet
>             Fix For: 0.6.0
>
>         Attachments: 0001-SSHD-100-create-files-when-SSH_FXF_CREAT-is-passed-t.patch, test.c
>
>
> Hi folks,
> I've mounted an sftp directory using sshfs like so: 
> # sshfs -d -p 9022 bpowers@$SERVER_NAME:/bpowers /home/bpowers/Desktop/wintest
> The following sequences of commands shows the problem:
> root@bpowers-laptop:/home/bpowers/Desktop/wintest/test# rm -f bar
> root@bpowers-laptop:/home/bpowers/Desktop/wintest/test# touch bar
> touch: cannot touch `bar': No such file or directory
> root@bpowers-laptop:/home/bpowers/Desktop/wintest/test# echo "foo" > bar
> root@bpowers-laptop:/home/bpowers/Desktop/wintest/test# cat bar
> foo
> root@bpowers-laptop:/home/bpowers/Desktop/wintest/test# rm bar
> root@bpowers-laptop:/home/bpowers/Desktop/wintest/test# touch bar
> touch: cannot touch `bar': No such file or directory
> ...
> I've reduced it to a simple test case.  Running the attached program gives me the following:
> root@bpowers-laptop:/home/bpowers/Desktop/wintest/test# /home/bpowers/creat_test 
> /home/bpowers/Desktop/wintest/test/abc2: No such file or directory
> /home/bpowers/Desktop/wintest/test/abc3: worked.
> The difference is in the flags passed to open(2), and the consequence of this is that I cannot use cp or rsync to create any files over sftp (although they will update existing files).  
> see attachment for the source of creat_test, which can be compiled with:
> $ gcc -o creat_test test.c
> and
> $ man 2 open
> for a description of the flags.
> Debugging output from sshfs shows the following:
> unique: 39, opcode: LOOKUP (1), nodeid: 1, insize: 45
> LOOKUP /test
> getattr /test
> &nbsp;&nbsp;&nbsp;&nbsp; NODEID: 2
> &nbsp;&nbsp;&nbsp;&nbsp; unique: 39, success, outsize: 144
> unique: 40, opcode: LOOKUP (1), nodeid: 2, insize: 45
> LOOKUP /test/abc2
> getattr /test/abc2
> &nbsp;&nbsp;&nbsp;&nbsp; unique: 40, error: -2 (No such file or directory), outsize: 16
> unique: 41, opcode: CREATE (35), nodeid: 2, insize: 61
> create flags: 0x8041 /test/abc2 0100644 umask=0022
> &nbsp;&nbsp;&nbsp;&nbsp; unique: 41, error: -2 (No such file or directory), outsize: 16
> unique: 42, opcode: LOOKUP (1), nodeid: 2, insize: 45
> LOOKUP /test/abc3
> getattr /test/abc3
> &nbsp;&nbsp;&nbsp;&nbsp; unique: 42, error: -2 (No such file or directory), outsize: 16
> unique: 43, opcode: CREATE (35), nodeid: 2, insize: 61
> create flags: 0x8241 /test/abc3 0100644 umask=0022
> &nbsp;&nbsp;&nbsp;&nbsp; create[25271456] flags: 0x8241 /test/abc3
> fgetattr[25271456] /test/abc3
> &nbsp;&nbsp;&nbsp;&nbsp; NODEID: 4
> &nbsp;&nbsp;&nbsp;&nbsp; unique: 43, success, outsize: 160
> unique: 44, opcode: FLUSH (25), nodeid: 4, insize: 64
> flush[25271456]
> &nbsp;&nbsp;&nbsp;&nbsp; unique: 44, success, outsize: 16
> unique: 45, opcode: RELEASE (18), nodeid: 4, insize: 64
> release[25271456] flags: 0x8001
> &nbsp;&nbsp;&nbsp;&nbsp; unique: 45, success, outsize: 16

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