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cifs: add FALLOC_FL_INSERT_RANGE support

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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>
This commit is contained in:
Ronnie Sahlberg 2021-03-27 06:31:30 +10:00 committed by Steve French
parent 5476b5dd82
commit 7fe6fe95b9
1 changed files with 40 additions and 0 deletions
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40
fs/cifs/smb2ops.c
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@ -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);