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Commit 66098044 authored by Steve French's avatar Steve French
Browse files

Add way to query creation time of file via cifs xattr 



Add parsing for new pseudo-xattr user.cifs.creationtime file
attribute to allow backup and test applications to view
birth time of file on cifs/smb3 mounts.

Signed-off-by: default avatarSteve French <steve.french@primarydata.com>
parent a958fff2

fs/cifs/xattr.c

+27 −1
Original line number Diff line number Diff line
@@ -34,7 +34,7 @@ 
#define MAX_EA_VALUE_SIZE 65535

#define CIFS_XATTR_CIFS_ACL "system.cifs_acl"

#define CIFS_XATTR_ATTRIB "cifs.dosattrib"  /* full name: user.cifs.dosattrib */



#define CIFS_XATTR_CREATETIME "cifs.creationtime"  /* user.cifs.creationtime */

/* BB need to add server (Samba e.g) support for security and trusted prefix */



enum { XATTR_USER, XATTR_CIFS_ACL, XATTR_ACL_ACCESS, XATTR_ACL_DEFAULT };
@@ -169,6 +169,29 @@ static int cifs_attrib_get(struct dentry *dentry, 
	return sizeof(__u32);

}



static int cifs_creation_time_get(struct dentry *dentry, struct inode *inode,

				  void *value, size_t size)

{

	ssize_t rc;

	__u64 * pcreatetime;



	rc = cifs_revalidate_dentry_attr(dentry);

	if (rc)

		return rc;



	if ((value == NULL) || (size == 0))

		return sizeof(__u64);

	else if (size < sizeof(__u64))

		return -ERANGE;



	/* return dos attributes as pseudo xattr */

	pcreatetime = (__u64 *)value;

	*pcreatetime = CIFS_I(inode)->createtime;

	return sizeof(__u64);



	return rc;

}





static int cifs_xattr_get(const struct xattr_handler *handler,

			  struct dentry *dentry, struct inode *inode,
@@ -202,6 +225,9 @@ static int cifs_xattr_get(const struct xattr_handler *handler, 
		if (strcmp(name, CIFS_XATTR_ATTRIB) == 0) {

			rc = cifs_attrib_get(dentry, inode, value, size);

			break;

		} else if (strcmp(name, CIFS_XATTR_CREATETIME) == 0) {

			rc = cifs_creation_time_get(dentry, inode, value, size);

			break;

		}



		if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)