diff options
| author | Steve French <smfrench@gmail.com> | 2016-09-20 03:05:57 -0500 |
|---|---|---|
| committer | Steve French <smfrench@gmail.com> | 2016-10-12 12:08:31 -0500 |
| commit | 6609804413ae5b84830e35fdd3a7b7fe4149cf71 (patch) | |
| tree | f9f591330c0109acfaeae2b819f418afd0d294c9 | |
| parent | a958fff2429525692c571bb6421b606fb0fef50a (diff) | |
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: Steve French <steve.french@primarydata.com>
| -rw-r--r-- | fs/cifs/xattr.c | 28 |
1 files changed, 27 insertions, 1 deletions
diff --git a/fs/cifs/xattr.c b/fs/cifs/xattr.c index c4237b8ad9c6..20af5187ba63 100644 --- a/fs/cifs/xattr.c +++ b/fs/cifs/xattr.c @@ -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) |