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cifs: add support for FALLOC_FL_COLLAPSE_RANGE

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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>
This commit is contained in:
Ronnie Sahlberg 2021-03-27 05:52:29 +10:00 committed by Steve French
parent f6d2353a50
commit 5476b5dd82
1 changed files with 35 additions and 0 deletions
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35
fs/cifs/smb2ops.c
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@ -3688,6 +3688,39 @@ out:
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);