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linux-sg2042
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Add way to query file attributes via cifs xattr 

Add parsing for new pseudo-xattr user.cifs.dosattrib file attribute
so tools can recognize what kind of file it is, and verify if common
SMB3 attributes (system, hidden, archive, sparse, indexed etc.) are
set.

Signed-off-by: Steve French <steve.french@primarydata.com>
Reviewed-by: Pavel Shilovsky <pshilovsky@samba.org>
This commit is contained in:
Steve French 2016-09-19 11:14:06 -05:00
parent 1573d2caf7
commit a958fff242
1 changed files with 33 additions and 1 deletions
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34
fs/cifs/xattr.c
View File

@ -33,6 +33,7 @@
#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 */
/* BB need to add server (Samba e.g) support for security and trusted prefix */
@ -144,6 +145,31 @@ out:
return rc;
}
static int cifs_attrib_get(struct dentry *dentry,
struct inode *inode, void *value,
size_t size)
{
ssize_t rc;
__u32 *pattribute;
rc = cifs_revalidate_dentry_attr(dentry);
if (rc)
return rc;
if ((value == NULL) || (size == 0))
return sizeof(__u32);
else if (size < sizeof(__u32))
return -ERANGE;
/* return dos attributes as pseudo xattr */
pattribute = (__u32 *)value;
*pattribute = CIFS_I(inode)->cifsAttrs;
return sizeof(__u32);
}
static int cifs_xattr_get(const struct xattr_handler *handler,
struct dentry *dentry, struct inode *inode,
const char *name, void *value, size_t size)
@ -168,10 +194,16 @@ static int cifs_xattr_get(const struct xattr_handler *handler,
rc = -ENOMEM;
goto out;
}
/* return dos attributes as pseudo xattr */
/* return alt name if available as pseudo attr */
switch (handler->flags) {
case XATTR_USER:
cifs_dbg(FYI, "%s:querying user xattr %s\n", __func__, name);
if (strcmp(name, CIFS_XATTR_ATTRIB) == 0) {
rc = cifs_attrib_get(dentry, inode, value, size);
break;
}
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
goto out;