diff options
| author |   Jeff Layton <jlayton@redhat.com> | 2008-09-22 21:33:33 -0400 |
|---|---|---|
| committer |   Steve French <sfrench@us.ibm.com> | 2008-09-23 02:24:13 +0000 |
| commit | 2846d3864738dd6e290755d0692cf377e09ba79f (patch) | |
| tree | 48f32072b0e2989ebfae167dfe04d7480c3e8167 /fs/cifs | |
| parent | cifs: don't use GFP_KERNEL with GFP_NOFS (diff) | |
| download | linux-dev-2846d3864738dd6e290755d0692cf377e09ba79f.tar.xz linux-dev-2846d3864738dd6e290755d0692cf377e09ba79f.zip | |
cifs: have find_writeable_file prefer filehandles opened by same task
When the CIFS client goes to write out pages, it needs to pick a
filehandle to write to. find_writeable_file however just picks the
first filehandle that it finds. This can cause problems when a lock
is issued against a particular filehandle and we pick a different
filehandle to write to.
This patch tries to avert this situation by having find_writable_file
prefer filehandles that have a pid that matches the current task.
This seems to fix lock test 11 from the connectathon test suite when
run against a windows server.
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
Diffstat (limited to 'fs/cifs')
| -rw-r--r-- | fs/cifs/file.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/fs/cifs/file.c b/fs/cifs/file.c index cbefe1f1f9fe..d39e852a28a9 100644 --- a/fs/cifs/file.c +++ b/fs/cifs/file.c @@ -1065,6 +1065,7 @@ struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *cifs_inode) struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode) { struct cifsFileInfo *open_file; + bool any_available = false; int rc; /* Having a null inode here (because mapping->host was set to zero by @@ -1080,8 +1081,10 @@ struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode) read_lock(&GlobalSMBSeslock); refind_writable: list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { - if (open_file->closePend) + if (open_file->closePend || + (!any_available && open_file->pid != current->tgid)) continue; + if (open_file->pfile && ((open_file->pfile->f_flags & O_RDWR) || (open_file->pfile->f_flags & O_WRONLY))) { @@ -1131,6 +1134,11 @@ refind_writable: of the loop here. */ } } + /* couldn't find useable FH with same pid, try any available */ + if (!any_available) { + any_available = true; + goto refind_writable; + } read_unlock(&GlobalSMBSeslock); return NULL; } |