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vfs: Add IOP_XATTR inode operations flag 

The IOP_XATTR inode operations flag in inode->i_opflags indicates that
the inode has xattr support.  The flag is automatically set by
new_inode() on filesystems with xattr support (where sb->s_xattr is
defined), and cleared otherwise.  Filesystems can explicitly clear it
for inodes that should not have xattr support.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Andreas Gruenbacher 2016-09-29 17:48:39 +02:00 committed by Al Viro
parent b6ba11773d
commit d0a5b995a3
3 changed files with 11 additions and 4 deletions
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2
fs/inode.c
View File

@ -140,6 +140,8 @@ int inode_init_always(struct super_block *sb, struct inode *inode)
inode->i_fop = &no_open_fops;
inode->__i_nlink = 1;
inode->i_opflags = 0;
if (sb->s_xattr)
inode->i_opflags |= IOP_XATTR;
i_uid_write(inode, 0);
i_gid_write(inode, 0);
atomic_set(&inode->i_writecount, 0);

12
fs/xattr.c
View File

@ -53,10 +53,13 @@ strcmp_prefix(const char *a, const char *a_prefix)
* Find the xattr_handler with the matching prefix.
*/
static const struct xattr_handler *
xattr_resolve_name(const struct xattr_handler **handlers, const char **name)
xattr_resolve_name(struct inode *inode, const char **name)
{
const struct xattr_handler **handlers = inode->i_sb->s_xattr;
const struct xattr_handler *handler;
if (!(inode->i_opflags & IOP_XATTR))
return ERR_PTR(-EOPNOTSUPP);
for_each_xattr_handler(handlers, handler) {
const char *n;
@ -298,6 +301,7 @@ vfs_getxattr(struct dentry *dentry, const char *name, void *value, size_t size)
error = -EOPNOTSUPP;
return error;
}
EXPORT_SYMBOL_GPL(vfs_getxattr);
@ -700,7 +704,7 @@ generic_getxattr(struct dentry *dentry, struct inode *inode,
{
const struct xattr_handler *handler;
handler = xattr_resolve_name(dentry->d_sb->s_xattr, &name);
handler = xattr_resolve_name(inode, &name);
if (IS_ERR(handler))
return PTR_ERR(handler);
return handler->get(handler, dentry, inode,
@ -755,7 +759,7 @@ generic_setxattr(struct dentry *dentry, struct inode *inode, const char *name,
if (size == 0)
value = ""; /* empty EA, do not remove */
handler = xattr_resolve_name(dentry->d_sb->s_xattr, &name);
handler = xattr_resolve_name(inode, &name);
if (IS_ERR(handler))
return PTR_ERR(handler);
return handler->set(handler, dentry, inode, name, value, size, flags);
@ -770,7 +774,7 @@ generic_removexattr(struct dentry *dentry, const char *name)
{
const struct xattr_handler *handler;
handler = xattr_resolve_name(dentry->d_sb->s_xattr, &name);
handler = xattr_resolve_name(d_inode(dentry), &name);
if (IS_ERR(handler))
return PTR_ERR(handler);
return handler->set(handler, dentry, d_inode(dentry), name, NULL,

1
include/linux/fs.h
View File

@ -591,6 +591,7 @@ is_uncached_acl(struct posix_acl *acl)
#define IOP_FASTPERM 0x0001
#define IOP_LOOKUP 0x0002
#define IOP_NOFOLLOW 0x0004
#define IOP_XATTR 0x0008
/*
* Keep mostly read-only and often accessed (especially for