Add support for original fallocate (9ccf3216) · Commits · 戴 / test

fs/cifs/smb2ops.c

+62 −1

Original line number	Diff line number	Diff line
		@@ -1102,6 +1102,64 @@ static long smb3_punch_hole(struct file file, struct cifs_tcon tcon,
		return rc;
		}

		static long smb3_simple_falloc(struct file file, struct cifs_tcon tcon,
		loff_t off, loff_t len, bool keep_size)
		{
		struct inode *inode;
		struct cifsInodeInfo *cifsi;
		struct cifsFileInfo *cfile = file->private_data;
		long rc = -EOPNOTSUPP;
		unsigned int xid;

		xid = get_xid();

		inode = cfile->dentry->d_inode;
		cifsi = CIFS_I(inode);

		/* if file not oplocked can't be sure whether asking to extend size */
		if (!CIFS_CACHE_READ(cifsi))
		if (keep_size == false)
		return -EOPNOTSUPP;

		/*
		* 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
		*/
		if ((cifsi->cifsAttrs & FILE_ATTRIBUTE_SPARSE_FILE) == 0) {
		if (keep_size == true)
		return 0;
		/* check if extending file */
		else if (i_size_read(inode) >= off + len)
		/* not extending file and already not sparse */
		return 0;
		/* BB: in future add else clause to extend file */
		else
		return -EOPNOTSUPP;
		}

		if ((keep_size == true) \|\| (i_size_read(inode) >= off + len)) {
		/*
		* Check if falloc starts within first few pages of file
		* and ends within a few pages of the end of file to
		* ensure that most of file is being forced to be
		* fallocated now. If so then setting whole file sparse
		* ie potentially making a few extra pages at the beginning
		* or end of the file non-sparse via set_sparse is harmless.
		*/
		if ((off > 8192) \|\| (off + len + 8192 < i_size_read(inode)))
		return -EOPNOTSUPP;

		rc = smb2_set_sparse(xid, tcon, cfile, inode, false);
		}
		/* BB: else ... in future add code to extend file and set sparse */


		free_xid(xid);
		return rc;
		}


		static long smb3_fallocate(struct file file, struct cifs_tcon tcon, int mode,
		loff_t off, loff_t len)
		{
		@@ -1112,7 +1170,10 @@ static long smb3_fallocate(struct file file, struct cifs_tcon tcon, int mode,
		if (mode & FALLOC_FL_KEEP_SIZE)
		return smb3_zero_range(file, tcon, off, len, true);
		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 == 0)
		return smb3_simple_falloc(file, tcon, off, len, false);

		return -EOPNOTSUPP;
		}

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