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  1. 05 4月, 2008 1 次提交
  3. 14 2月, 2008 1 次提交
    • S
      [CIFS] fixup prefixpaths which contain multiple path components · 03a143c9
      由 Steve French 提交于 
      Currently, when we get a prefixpath as part of mount, the kernel only
changes the first character to be a '/' or '\' depending on whether
posix extensions are enabled. This is problematic as it expects
mount.cifs to pass in the correct delimiter in the rest of the
prefixpath. But, mount.cifs may not know *what* the correct delimiter
is. It's a chicken and egg problem.

Note that mount.cifs should not do conversion of the
prefixpath - if we want posix behavior then '\' is legal in a path
(and we have had bugs in the distant path to prove to me that
customers sometimes have apps that require '\').  The kernel code
assumes that the path passed in is posix (and current code will handle
the first path component fine but was broken for Windows mounts
for "deep" prefixpaths unless the user specified a prefixpath with '\'
deep in it.   So e.g. with current kernel code:

1) mount to //server/share/dir1 will work to all server types
2) mount to //server/share/dir1/subdir1 will work to Samba
3) mount to //server/share/dir1\\subdir1 will work to Windows

But case two would fail to Windows without the fix.
With the kernel cifs module fix case two now works.

First analyzed by Jeff Layton and Simo Sorce

CC: Jeff Layton <jlayton@redhat.com>
CC: Simo Sorce <simo@samba.org>
Signed-off-by: NSteve French <sfrench@us.ibm.com>
      03a143c9
  5. 31 12月, 2007 3 次提交
  7. 21 11月, 2007 1 次提交
    • J
      [CIFS] Fix potential data corruption when writing out cached dirty pages · cea21805
      由 Jeff Layton 提交于 
      Fix RedHat bug 329431

The idea here is separate "conscious" from "unconscious" flushes.
Conscious flushes are those due to a fsync() or close(). Unconscious
ones are flushes that occur as a side effect of some other operation or
due to memory pressure.

Currently, when an error occurs during an unconscious flush (ENOSPC or
EIO), we toss out the page and don't preserve that error to report to
the user when a conscious flush occurs. If after the unconscious flush,
there are no more dirty pages for the inode, the conscious flush will
simply return success even though there were previous errors when writing
out pages. This can lead to data corruption.

The easiest way to reproduce this is to mount up a CIFS share that's
very close to being full or where the user is very close to quota. mv
a file to the share that's slightly larger than the quota allows. The
writes will all succeed (since they go to pagecache). The mv will do a
setattr to set the new file's attributes. This calls
filemap_write_and_wait,
which will return an error since all of the pages can't be written out.
Then later, when the flush and release ops occur, there are no more
dirty pages in pagecache for the file and those operations return 0. mv
then assumes that the file was written out correctly and deletes the
original.

CIFS already has a write_behind_rc variable where it stores the results
from earlier flushes, but that value is only reported in cifs_close.
Since the VFS ignores the return value from the release operation, this
isn't helpful. We should be reporting this error during the flush
operation.

This patch does the following:

1) changes cifs_fsync to use filemap_write_and_wait and cifs_flush and also
sync to check its return code. If it returns successful, they then check
the value of write_behind_rc to see if an earlier flush had reported any
errors. If so, they return that error and clear write_behind_rc.

2) sets write_behind_rc in a few other places where pages are written
out as a side effect of other operations and the code waits on them.

3) changes cifs_setattr to only call filemap_write_and_wait for
ATTR_SIZE changes.

4) makes cifs_writepages accurately distinguish between EIO and ENOSPC
errors when writing out pages.

Some simple testing indicates that the patch works as expected and that
it fixes the reproduceable known problem.
Acked-by: NDave Kleikamp <shaggy@austin.rr.com>
Signed-off-by: NJeff Layton <jlayton@redhat.com>
Signed-off-by: NSteve French <sfrench@us.ibm.com>
      cea21805
  9. 17 11月, 2007 1 次提交
  11. 10 11月, 2007 1 次提交
    • J
      [CIFS] fix oops on second mount to same server when null auth is used · 9b8f5f57
      由 Jeff Layton 提交于 
      When a share is mounted using no username, cifs_mount sets
volume_info.username as a NULL pointer, and the sesInfo userName as an
empty string. The volume_info.username is passed to a couple of other
functions to see if there is an existing unc or tcp connection that can
be used. These functions assume that the username will be a valid
string that can be passed to strncmp. If the pointer is NULL, then the
kernel will oops if there's an existing session to which the string
can be compared.

This patch changes cifs_mount to set volume_info.username to an empty
string in this situation, which prevents the oops and should make it
so that the comparison to other null auth sessions match.
Signed-off-by: NJeff Layton <jlayton@redhat.com>
Signed-off-by: NSteve French <sfrench@us.ibm.com>
      9b8f5f57
  13. 09 11月, 2007 1 次提交
  15. 01 11月, 2007 1 次提交
    • S
      [CIFS] when mount helper missing fix slash wrong direction in share · 1fb64bfc
      由 Steve French 提交于 
      Kernel bugzilla bug #9228

If mount helper (mount.cifs) missing, mounts with form like
//10.11.12.13/c$ would not work (only mounts with slash e.g.
//10.11.12.13\\c$ would work) due to problem with slash supposed
to be converted to backslash by the mount helper (which is not
there).

If we fail on converting an IPv4 address in in4_pton then
try to canonicalize the first slash (ie between sharename
and host ip address) if necessary.  If we have to retry
to check for IPv6 address the slash is already converted
if necessary.
Signed-off-by: NSteve French <sfrench@us.ibm.com>
      1fb64bfc
  17. 30 10月, 2007 1 次提交
  19. 18 10月, 2007 2 次提交
  21. 15 10月, 2007 1 次提交
  23. 12 10月, 2007 1 次提交
  25. 29 9月, 2007 1 次提交
  27. 28 9月, 2007 1 次提交
  29. 24 8月, 2007 1 次提交
  31. 26 7月, 2007 1 次提交
  33. 15 7月, 2007 1 次提交
    • S
      [CIFS] Add support for new POSIX unlink · 2d785a50
      由 Steve French 提交于 
      In the cleanup phase of the dbench test, we were noticing sharing
violation followed by failed directory removals when dbench
did not close the test files before the cleanup phase started.
Using the new POSIX unlink, which Samba has supported for a few
months, avoids this.
Signed-off-by: NSteve French <sfrench@us.ibm.com>
      2d785a50
  35. 12 7月, 2007 1 次提交
  37. 09 7月, 2007 1 次提交
  39. 07 7月, 2007 1 次提交
  41. 25 6月, 2007 1 次提交
  43. 05 5月, 2007 1 次提交
    • J
      [CIFS] Make sec=none force an anonymous mount · 8426c39c
      由 Jeff Layton 提交于 
      We had a customer report that attempting to make CIFS mount with a null
username (i.e. doing an anonymous mount) doesn't work. Looking through the
code, it looks like CIFS expects a NULL username from userspace in order
to trigger an anonymous mount. The mount.cifs code doesn't seem to ever
pass a null username to the kernel, however.

It looks also like the kernel can take a sec=none option, but it only seems
to look at it if the username is already NULL. This seems redundant and
effectively makes sec=none useless.

The following patch makes sec=none force an anonymous mount.
Signed-off-by: NSteve French <sfrench@us.ibm.com>
      8426c39c
  45. 01 5月, 2007 1 次提交
    • S
      [CIFS] UID/GID override on CIFS mounts to Samba · 4523cc30
      由 Steve French 提交于 
      When CIFS Unix Extensions are negotiated we get the Unix uid and gid
owners of the file from the server (on the Unix Query Path Info
levels), but if the server's uids don't match the client uid's users
were having to disable the Unix Extensions (which turned off features
they still wanted).   The changeset patch allows users to override uid
and/or gid for file/directory owner with a default uid and/or gid
specified at mount (as is often done when mounting from Linux cifs
client to Windows server).  This changeset also displays the uid
and gid used by default in /proc/mounts (if applicable).

Also cleans up code by adding some of the missing spaces after
"if" keywords per-kernel style guidelines (as suggested by Randy Dunlap
when he reviewed the patch).
Signed-off-by: NSteve French <sfrench@us.ibm.com>
      4523cc30
  47. 25 4月, 2007 1 次提交
    • S
      [CIFS] Add IPv6 support · 5858ae44
      由 Steve French 提交于 
      IPv6 support was started a few years ago in the cifs client, but lacked a
kernel helper function for parsing the ascii form of the ipv6 address. Now
that that is added (and now IPv6 is the default that some OS use now) it
was fairly easy to finish  the cifs ipv6 support.  This  requires that
CIFS_EXPERIMENTAL be enabled and (at least until the mount.cifs module is
modified to use a new ipv6 friendly call instead of gethostbyname) and the
ipv6 address be passed on the mount as "ip=" mount option.

Thanks
Signed-off-by: NSteve French <sfrench@us.ibm.com>
      5858ae44
  49. 24 4月, 2007 1 次提交
  51. 07 4月, 2007 1 次提交
  53. 23 3月, 2007 1 次提交
  55. 10 3月, 2007 1 次提交
  57. 06 3月, 2007 1 次提交
  59. 27 2月, 2007 1 次提交
  61. 14 2月, 2007 1 次提交
  63. 09 2月, 2007 1 次提交
  65. 07 2月, 2007 1 次提交
  67. 24 12月, 2006 1 次提交
  69. 08 12月, 2006 1 次提交
  71. 02 11月, 2006 1 次提交
  73. 31 10月, 2006 1 次提交