CIFS: Create routine find_writable_file to reduce redundant code
Signed-off-by: Dave Kleikamp <shaggy@austin.ibm.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index 9411083..9487545 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -904,6 +904,25 @@
return total_written;
}
+static struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode)
+{
+ struct cifsFileInfo *open_file;
+
+ read_lock(&GlobalSMBSeslock);
+ list_for_each_entry(open_file, &cifs_inode->openFileList, flist) {
+ if (open_file->closePend)
+ continue;
+ if (open_file->pfile &&
+ ((open_file->pfile->f_flags & O_RDWR) ||
+ (open_file->pfile->f_flags & O_WRONLY))) {
+ read_unlock(&GlobalSMBSeslock);
+ return open_file;
+ }
+ }
+ read_unlock(&GlobalSMBSeslock);
+ return NULL;
+}
+
static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to)
{
struct address_space *mapping = page->mapping;
@@ -914,10 +933,7 @@
struct cifs_sb_info *cifs_sb;
struct cifsTconInfo *pTcon;
struct inode *inode;
- struct cifsInodeInfo *cifsInode;
- struct cifsFileInfo *open_file = NULL;
- struct list_head *tmp;
- struct list_head *tmp1;
+ struct cifsFileInfo *open_file;
if (!mapping || !mapping->host)
return -EFAULT;
@@ -945,49 +961,19 @@
if (mapping->host->i_size - offset < (loff_t)to)
to = (unsigned)(mapping->host->i_size - offset);
- cifsInode = CIFS_I(mapping->host);
- read_lock(&GlobalSMBSeslock);
- /* BB we should start at the end */
- list_for_each_safe(tmp, tmp1, &cifsInode->openFileList) {
- open_file = list_entry(tmp, struct cifsFileInfo, flist);
- if (open_file->closePend)
- continue;
- /* We check if file is open for writing first */
- if ((open_file->pfile) &&
- ((open_file->pfile->f_flags & O_RDWR) ||
- (open_file->pfile->f_flags & O_WRONLY))) {
- read_unlock(&GlobalSMBSeslock);
- bytes_written = cifs_write(open_file->pfile,
- write_data, to-from,
- &offset);
- read_lock(&GlobalSMBSeslock);
+ open_file = find_writable_file(CIFS_I(mapping->host));
+ if (open_file) {
+ bytes_written = cifs_write(open_file->pfile, write_data,
+ to-from, &offset);
/* Does mm or vfs already set times? */
- inode->i_atime =
- inode->i_mtime = current_fs_time(inode->i_sb);
- if ((bytes_written > 0) && (offset)) {
- rc = 0;
- } else if (bytes_written < 0) {
- if (rc == -EBADF) {
- /* have seen a case in which kernel seemed to
- have closed/freed a file even with writes
- active so we might as well see if there are
- other file structs to try for the same
- inode before giving up */
- continue;
- } else
- rc = bytes_written;
- }
- break; /* now that we found a valid file handle and
- tried to write to it we are done, no sense
- continuing to loop looking for another */
+ inode->i_atime = inode->i_mtime = current_fs_time(inode->i_sb);
+ if ((bytes_written > 0) && (offset)) {
+ rc = 0;
+ } else if (bytes_written < 0) {
+ if (rc != -EBADF)
+ rc = bytes_written;
}
- if (tmp->next == NULL) {
- cFYI(1, ("File instance %p removed", tmp));
- break;
- }
- }
- read_unlock(&GlobalSMBSeslock);
- if (open_file == NULL) {
+ } else {
cFYI(1, ("No writeable filehandles for inode"));
rc = -EIO;
}
@@ -1604,40 +1590,12 @@
page caching in the current Linux kernel design */
int is_size_safe_to_change(struct cifsInodeInfo *cifsInode)
{
- struct list_head *tmp;
- struct list_head *tmp1;
- struct cifsFileInfo *open_file = NULL;
- int rc = TRUE;
-
- if (cifsInode == NULL)
- return rc;
-
- read_lock(&GlobalSMBSeslock);
- list_for_each_safe(tmp, tmp1, &cifsInode->openFileList) {
- open_file = list_entry(tmp, struct cifsFileInfo, flist);
- if (open_file == NULL)
- break;
- if (open_file->closePend)
- continue;
- /* We check if file is open for writing,
- BB we could supplement this with a check to see if file size
- changes have been flushed to server - ie inode metadata dirty */
- if ((open_file->pfile) &&
- ((open_file->pfile->f_flags & O_RDWR) ||
- (open_file->pfile->f_flags & O_WRONLY))) {
- rc = FALSE;
- break;
- }
- if (tmp->next == NULL) {
- cFYI(1, ("File instance %p removed", tmp));
- break;
- }
- }
- read_unlock(&GlobalSMBSeslock);
- return rc;
+ if (cifsInode && find_writable_file(cifsInode))
+ return 0;
+ else
+ return 1;
}
-
static int cifs_prepare_write(struct file *file, struct page *page,
unsigned from, unsigned to)
{