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authorRonnie Sahlberg <lsahlber@redhat.com>2021-03-26 21:31:30 +0100
committerSteve French <stfrench@microsoft.com>2021-04-25 23:28:24 +0200
commit7fe6fe95b936084dce6eedcc2cccadf96eafae73 (patch)
tree6faefa5b188bc0c7e637f58b25579d72b8eca80d /fs/cifs
parentcifs: add support for FALLOC_FL_COLLAPSE_RANGE (diff)
downloadlinux-7fe6fe95b936084dce6eedcc2cccadf96eafae73.tar.xz
linux-7fe6fe95b936084dce6eedcc2cccadf96eafae73.zip
cifs: add FALLOC_FL_INSERT_RANGE support
Emulated via server side copy and setsize for SMB3 and later. In the future we could compound this (and/or optionally use DUPLICATE_EXTENTS if supported by the server). Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com> Signed-off-by: Steve French <stfrench@microsoft.com>
Diffstat (limited to 'fs/cifs')
-rw-r--r--fs/cifs/smb2ops.c40
1 files changed, 40 insertions, 0 deletions
diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index 88a787d6067f..56355117b46d 100644
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -3721,6 +3721,44 @@ static long smb3_collapse_range(struct file *file, struct cifs_tcon *tcon,
return rc;
}
+static long smb3_insert_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;
+ __u64 count;
+
+ xid = get_xid();
+
+ if (off >= i_size_read(file->f_inode)) {
+ rc = -EINVAL;
+ goto out;
+ }
+
+ count = i_size_read(file->f_inode) - off;
+ 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 = smb2_copychunk_range(xid, cfile, cfile, off, count, off + len);
+ if (rc < 0)
+ goto out;
+
+ rc = smb3_zero_range(file, tcon, off, len, 1);
+ 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;
@@ -3894,6 +3932,8 @@ static long smb3_fallocate(struct file *file, struct cifs_tcon *tcon, int mode,
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 == FALLOC_FL_INSERT_RANGE)
+ return smb3_insert_range(file, tcon, off, len);
else if (mode == 0)
return smb3_simple_falloc(file, tcon, off, len, false);