From: Ronnie Sahlberg <lsahlber@redhat.com>
Date: Sat, 27 Mar 2021 05:52:29 +1000
Subject: [PATCH] cifs: add support for FALLOC_FL_COLLAPSE_RANGE
Git-commit: 5476b5dd82c8bb9d0dd426f96575ae656cede140
References: bsc#1190317
Patch-mainline: v5.13-rc1
Emulated for SMB3 and later via server side copy
and setsize. Eventually this could be compounded.
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Acked-by: Enzo Matsumiya <ematsumiya@suse.de>
---
fs/cifs/smb2ops.c | 35 +++++++++++++++++++++++++++++++++++
1 file changed, 35 insertions(+)
diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index 49cdc6e0d9d8..88a787d6067f 100644
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -3688,6 +3688,39 @@ static long smb3_simple_falloc(struct file *file, struct cifs_tcon *tcon,
return rc;
}
+static long smb3_collapse_range(struct file *file, struct cifs_tcon *tcon,
+ loff_t off, loff_t len)
+{
+ int rc;
+ unsigned int xid;
+ struct cifsFileInfo *cfile = file->private_data;
+ __le64 eof;
+
+ xid = get_xid();
+
+ if (off >= i_size_read(file->f_inode) ||
+ off + len >= i_size_read(file->f_inode)) {
+ rc = -EINVAL;
+ goto out;
+ }
+
+ rc = smb2_copychunk_range(xid, cfile, cfile, off + len,
+ i_size_read(file->f_inode) - off - len, off);
+ if (rc < 0)
+ goto out;
+
+ eof = cpu_to_le64(i_size_read(file->f_inode) - len);
+ rc = SMB2_set_eof(xid, tcon, cfile->fid.persistent_fid,
+ cfile->fid.volatile_fid, cfile->pid, &eof);
+ if (rc < 0)
+ goto out;
+
+ rc = 0;
+ out:
+ free_xid(xid);
+ return rc;
+}
+
static loff_t smb3_llseek(struct file *file, struct cifs_tcon *tcon, loff_t offset, int whence)
{
struct cifsFileInfo *wrcfile, *cfile = file->private_data;
@@ -3859,6 +3892,8 @@ static long smb3_fallocate(struct file *file, struct cifs_tcon *tcon, int mode,
return smb3_zero_range(file, tcon, off, len, false);
} else if (mode == FALLOC_FL_KEEP_SIZE)
return smb3_simple_falloc(file, tcon, off, len, true);
+ else if (mode == FALLOC_FL_COLLAPSE_RANGE)
+ return smb3_collapse_range(file, tcon, off, len);
else if (mode == 0)
return smb3_simple_falloc(file, tcon, off, len, false);
--
2.33.0