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From "Bobby Powers (JIRA)" <j...@apache.org>
Subject [jira] Created: (SSHD-100) [sftp] open(2) w/ O_CREAT|O_TRUNC works, but O_CREAT alone fails
Date Fri, 03 Dec 2010 23:34:14 GMT
[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
         Attachments: 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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