Now we just return NULL cifsFileInfo pointer in cases we didn't find
or couldn't reopen a file. This hides errors from cifs_reopen_file()
especially retryable errors which should be handled appropriately.
Create new cifs_get_writable_file() routine that returns error codes
from cifs_reopen_file() and use it in the writeback codepath.
Signed-off-by: Pavel Shilovsky <pshilov@xxxxxxxxxxxxx>
---
fs/cifs/cifsproto.h | 3 ++
fs/cifs/cifssmb.c | 9 ++++--
fs/cifs/file.c | 90 ++++++++++++++++++++++++++++++++++++-----------------
3 files changed, 70 insertions(+), 32 deletions(-)
diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
index 9e8394f..4f96b3b 100644
--- a/fs/cifs/cifsproto.h
+++ b/fs/cifs/cifsproto.h
@@ -134,6 +134,9 @@ extern bool is_size_safe_to_change(struct cifsInodeInfo *, __u64 eof);
extern void cifs_update_eof(struct cifsInodeInfo *cifsi, loff_t offset,
unsigned int bytes_written);
extern struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *, bool);
+extern int cifs_get_writable_file(struct cifsInodeInfo *cifs_inode,
+ bool fsuid_only,
+ struct cifsFileInfo **ret_file);
extern struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *, bool);
extern unsigned int smbCalcSize(void *buf, struct TCP_Server_Info *server);
extern int decode_negTokenInit(unsigned char *security_blob, int length,
diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index 6c89279..c0e3a04 100644
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -2126,10 +2126,13 @@ cifs_writev_requeue(struct cifs_writedata *wdata)
wdata2->tailsz = tailsz;
wdata2->bytes = cur_len;
- wdata2->cfile = find_writable_file(CIFS_I(inode), false);
+ rc = cifs_get_writable_file(CIFS_I(inode), false,
+ &wdata2->cfile);
if (!wdata2->cfile) {
- cifs_dbg(VFS, "No writable handle to retry writepages\n");
- rc = -EBADF;
+ cifs_dbg(VFS, "No writable handle to retry writepages rc=%d\n",
+ rc);
+ if (!is_retryable_error(rc))
+ rc = -EBADF;
} else {
wdata2->pid = wdata2->cfile->pid;
rc = server->ops->async_writev(wdata2,
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index 9de7ad5..85a034d 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -1842,24 +1842,30 @@ struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *cifs_inode,
return NULL;
}
-struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode,
- bool fsuid_only)
+/* Return -EBADF if no handle is found and general rc otherwise */
+int
+cifs_get_writable_file(struct cifsInodeInfo *cifs_inode, bool fsuid_only,
+ struct cifsFileInfo **ret_file)
{
struct cifsFileInfo *open_file, *inv_file = NULL;
struct cifs_sb_info *cifs_sb;
struct cifs_tcon *tcon;
bool any_available = false;
- int rc;
+ int rc = -EBADF;
unsigned int refind = 0;
- /* Having a null inode here (because mapping->host was set to zero by
- the VFS or MM) should not happen but we had reports of on oops (due to
- it being zero) during stress testcases so we need to check for it */
+ *ret_file = NULL;
+
+ /*
+ * Having a null inode here (because mapping->host was set to zero by
+ * the VFS or MM) should not happen but we had reports of on oops (due
+ * to it being zero) during stress testcases so we need to check for it
+ */
if (cifs_inode == NULL) {
cifs_dbg(VFS, "Null inode passed to cifs_writeable_file\n");
dump_stack();
- return NULL;
+ return rc;
}
cifs_sb = CIFS_SB(cifs_inode->vfs_inode.i_sb);
@@ -1873,7 +1879,7 @@ struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode,
refind_writable:
if (refind > MAX_REOPEN_ATT) {
spin_unlock(&tcon->open_file_lock);
- return NULL;
+ return rc;
}
list_for_each_entry(open_file, &cifs_inode->openFileList, flist) {
if (!any_available && open_file->pid != current->tgid)
@@ -1885,7 +1891,8 @@ struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode,
/* found a good writable file */
cifsFileInfo_get(open_file);
spin_unlock(&tcon->open_file_lock);
- return open_file;
+ *ret_file = open_file;
+ return 0;
} else {
if (!inv_file)
inv_file = open_file;
@@ -1907,22 +1914,35 @@ struct cifsFileInfo *find_writable_file(struct cifsInodeInfo *cifs_inode,
if (inv_file) {
rc = cifs_reopen_file(inv_file, false);
- if (!rc)
- return inv_file;
- else {
- spin_lock(&tcon->open_file_lock);
- list_move_tail(&inv_file->flist,
- &cifs_inode->openFileList);
- spin_unlock(&tcon->open_file_lock);
- cifsFileInfo_put(inv_file);
- ++refind;
- inv_file = NULL;
- spin_lock(&tcon->open_file_lock);
- goto refind_writable;
+ if (!rc) {
+ *ret_file = inv_file;
+ return 0;
}
+
+ spin_lock(&tcon->open_file_lock);
+ list_move_tail(&inv_file->flist, &cifs_inode->openFileList);
+ spin_unlock(&tcon->open_file_lock);
+ cifsFileInfo_put(inv_file);
+ ++refind;
+ inv_file = NULL;
+ spin_lock(&tcon->open_file_lock);
+ goto refind_writable;
}
- return NULL;
+ return rc;
+}
+
+struct cifsFileInfo *
+find_writable_file(struct cifsInodeInfo *cifs_inode, bool fsuid_only)
+{
+ struct cifsFileInfo *cfile;
+ int rc;
+
+ rc = cifs_get_writable_file(cifs_inode, fsuid_only, &cfile);
+ if (rc)
+ cifs_dbg(FYI, "couldn't find writable handle rc=%d", rc);
+
+ return cfile;
}
static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to)
@@ -1959,8 +1979,8 @@ static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to)
if (mapping->host->i_size - offset < (loff_t)to)
to = (unsigned)(mapping->host->i_size - offset);
- open_file = find_writable_file(CIFS_I(mapping->host), false);
- if (open_file) {
+ rc = cifs_get_writable_file(CIFS_I(mapping->host), false, &open_file);
+ if (!rc) {
bytes_written = cifs_write(open_file, open_file->pid,
write_data, to - from, &offset);
cifsFileInfo_put(open_file);
@@ -1970,9 +1990,12 @@ static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to)
rc = 0;
else if (bytes_written < 0)
rc = bytes_written;
+ else
+ rc = -EFAULT;
} else {
- cifs_dbg(FYI, "No writeable filehandles for inode\n");
- rc = -EIO;
+ cifs_dbg(FYI, "No writable handle for write page rc=%d\n", rc);
+ if (!is_retryable_error(rc))
+ rc = -EIO;
}
kunmap(page);
@@ -2144,11 +2167,16 @@ static int cifs_writepages(struct address_space *mapping,
pgoff_t next = 0, tofind, saved_index = index;
struct cifs_credits credits_on_stack;
struct cifs_credits *credits = &credits_on_stack;
+ int get_file_rc = 0;
if (cfile)
cifsFileInfo_put(cfile);
- cfile = find_writable_file(CIFS_I(inode), false);
+ rc = cifs_get_writable_file(CIFS_I(inode), false, &cfile);
+
+ /* in case of an error store it to return later */
+ if (rc)
+ get_file_rc = rc;
rc = server->ops->wait_mtu_credits(server, cifs_sb->wsize,
&wsize, credits);
@@ -2189,8 +2217,12 @@ static int cifs_writepages(struct address_space *mapping,
cfile = NULL;
if (!wdata->cfile) {
- cifs_dbg(VFS, "No writable handle in writepages\n");
- rc = -EBADF;
+ cifs_dbg(VFS, "No writable handle in writepages rc=%d\n",
+ get_file_rc);
+ if (is_retryable_error(get_file_rc))
+ rc = get_file_rc;
+ else
+ rc = -EBADF;
} else
rc = wdata_send_pages(wdata, nr_pages, mapping, wbc);
--
2.7.4
