From: Ronnie Sahlberg <lsahlber@redhat.com>
Date: Fri, 17 Jan 2020 11:45:02 +1000
Subject: [PATCH] cifs: add support for fallocate mode 0 for non-sparse files
Git-commit: 8bd0d701445ef263a52968ced2854c3d35712695
References: bsc#1144333
Patch-mainline: v5.6-rc1
RHBZ 1336264
When we extend a file we must also force the size to be updated.
This fixes an issue with holetest in xfs-tests which performs the following
sequence :
1, create a new file
2, use fallocate mode==0 to populate the file
3, mmap the file
4, touch each page by reading the mmapped region.
Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Acked-by: Paulo Alcantara <palcantara@suse.de>
---
fs/cifs/cifsfs.h | 3 ++
fs/cifs/inode.c | 4 +--
fs/cifs/smb2ops.c | 64 ++++++++++++++++++++++++------------------------------
3 files changed, 34 insertions(+), 37 deletions(-)
--- a/fs/cifs/cifsfs.h
+++ b/fs/cifs/cifsfs.h
@@ -150,6 +150,9 @@ extern ssize_t cifs_file_copychunk_range
size_t len, unsigned int flags);
extern long cifs_ioctl(struct file *filep, unsigned int cmd, unsigned long arg);
+extern void cifs_setsize(struct inode *inode, loff_t offset);
+extern int cifs_truncate_page(struct address_space *mapping, loff_t from);
+
#ifdef CONFIG_CIFS_NFSD_EXPORT
extern const struct export_operations cifs_export_ops;
#endif /* CONFIG_CIFS_NFSD_EXPORT */
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -2228,7 +2228,7 @@ int cifs_fiemap(struct inode *inode, str
return -ENOTSUPP;
}
-static int cifs_truncate_page(struct address_space *mapping, loff_t from)
+int cifs_truncate_page(struct address_space *mapping, loff_t from)
{
pgoff_t index = from >> PAGE_SHIFT;
unsigned offset = from & (PAGE_SIZE - 1);
@@ -2245,7 +2245,7 @@ static int cifs_truncate_page(struct add
return rc;
}
-static void cifs_setsize(struct inode *inode, loff_t offset)
+void cifs_setsize(struct inode *inode, loff_t offset)
{
struct cifsInodeInfo *cifs_i = CIFS_I(inode);
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -11,6 +11,7 @@
#include <linux/scatterlist.h>
#include <linux/uuid.h>
#include <crypto/aead.h>
+#include "cifsfs.h"
#include "cifsglob.h"
#include "smb2pdu.h"
#include "smb2proto.h"
@@ -3161,28 +3162,32 @@ static long smb3_simple_falloc(struct fi
}
/*
+ * Extending the file
+ */
+ if ((keep_size == false) && i_size_read(inode) < off + len) {
+ if ((cifsi->cifsAttrs & FILE_ATTRIBUTE_SPARSE_FILE) == 0)
+ smb2_set_sparse(xid, tcon, cfile, inode, false);
+
+ eof = cpu_to_le64(off + len);
+ rc = SMB2_set_eof(xid, tcon, cfile->fid.persistent_fid,
+ cfile->fid.volatile_fid, cfile->pid, &eof);
+ if (rc == 0) {
+ cifsi->server_eof = off + len;
+ cifs_setsize(inode, off + len);
+ cifs_truncate_page(inode->i_mapping, inode->i_size);
+ truncate_setsize(inode, off + len);
+ }
+ goto out;
+ }
+
+ /*
* Files are non-sparse by default so falloc may be a no-op
- * Must check if file sparse. If not sparse, and not extending
- * then no need to do anything since file already allocated
+ * Must check if file sparse. If not sparse, and since we are not
+ * extending then no need to do anything since file already allocated
*/
if ((cifsi->cifsAttrs & FILE_ATTRIBUTE_SPARSE_FILE) == 0) {
- if (keep_size == true)
- rc = 0;
- /* check if extending file */
- else if (i_size_read(inode) >= off + len)
- /* not extending file and already not sparse */
- rc = 0;
- /* BB: in future add else clause to extend file */
- else
- rc = -EOPNOTSUPP;
- if (rc)
- trace_smb3_falloc_err(xid, cfile->fid.persistent_fid,
- tcon->tid, tcon->ses->Suid, off, len, rc);
- else
- trace_smb3_falloc_done(xid, cfile->fid.persistent_fid,
- tcon->tid, tcon->ses->Suid, off, len);
- free_xid(xid);
- return rc;
+ rc = 0;
+ goto out;
}
if ((keep_size == true) || (i_size_read(inode) >= off + len)) {
@@ -3196,25 +3201,14 @@ static long smb3_simple_falloc(struct fi
*/
if ((off > 8192) || (off + len + 8192 < i_size_read(inode))) {
rc = -EOPNOTSUPP;
- trace_smb3_falloc_err(xid, cfile->fid.persistent_fid,
- tcon->tid, tcon->ses->Suid, off, len, rc);
- free_xid(xid);
- return rc;
- }
-
- smb2_set_sparse(xid, tcon, cfile, inode, false);
- rc = 0;
- } else {
- smb2_set_sparse(xid, tcon, cfile, inode, false);
- rc = 0;
- if (i_size_read(inode) < off + len) {
- eof = cpu_to_le64(off + len);
- rc = SMB2_set_eof(xid, tcon, cfile->fid.persistent_fid,
- cfile->fid.volatile_fid, cfile->pid,
- &eof);
+ goto out;
}
}
+ smb2_set_sparse(xid, tcon, cfile, inode, false);
+ rc = 0;
+
+out:
if (rc)
trace_smb3_falloc_err(xid, cfile->fid.persistent_fid, tcon->tid,
tcon->ses->Suid, off, len, rc);