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-----BEGIN PGP SIGNATURE----- iHUEABYKAB0WIQRAhzRXHqcMeLMyaSiRxhvAZXjcogUCZEEhwgAKCRCRxhvAZXjc otwgAQDXHnKiPm/d76lITXbxdUNCtvZz+ig26EbOrD+vEszzIQEA81dru0QbCNCt ctoZdcsmtKbt2VaYQF1CDOhlnNg5VQM= =pER1 -----END PGP SIGNATURE----- Merge tag 'v6.4/vfs.acl' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs Pull acl updates from Christian Brauner: "After finishing the introduction of the new posix acl api last cycle the generic POSIX ACL xattr handlers are still around in the filesystems xattr handlers for two reasons: (1) Because a few filesystems rely on the ->list() method of the generic POSIX ACL xattr handlers in their ->listxattr() inode operation. (2) POSIX ACLs are only available if IOP_XATTR is raised. The IOP_XATTR flag is raised in inode_init_always() based on whether the sb->s_xattr pointer is non-NULL. IOW, the registered xattr handlers of the filesystem are used to raise IOP_XATTR. Removing the generic POSIX ACL xattr handlers from all filesystems would risk regressing filesystems that only implement POSIX ACL support and no other xattrs (nfs3 comes to mind). This contains the work to decouple POSIX ACLs from the IOP_XATTR flag as they don't depend on xattr handlers anymore. So it's now possible to remove the generic POSIX ACL xattr handlers from the sb->s_xattr list of all filesystems. This is a crucial step as the generic POSIX ACL xattr handlers aren't used for POSIX ACLs anymore and POSIX ACLs don't depend on the xattr infrastructure anymore. Adressing problem (1) will require more long-term work. It would be best to get rid of the ->list() method of xattr handlers completely at some point. For erofs, ext{2,4}, f2fs, jffs2, ocfs2, and reiserfs the nop POSIX ACL xattr handler is kept around so they can continue to use array-based xattr handler indexing. This update does simplify the ->listxattr() implementation of all these filesystems however" * tag 'v6.4/vfs.acl' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs: acl: don't depend on IOP_XATTR ovl: check for ->listxattr() support reiserfs: rework priv inode handling fs: rename generic posix acl handlers reiserfs: rework ->listxattr() implementation fs: simplify ->listxattr() implementation fs: drop unused posix acl handlers xattr: remove unused argument xattr: add listxattr helper xattr: simplify listxattr helpers
192 lines
4.9 KiB
C
192 lines
4.9 KiB
C
// SPDX-License-Identifier: LGPL-2.1
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/*
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* Copyright IBM Corporation, 2010
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* Author Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
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*/
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#include <linux/module.h>
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#include <linux/fs.h>
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#include <linux/sched.h>
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#include <linux/uio.h>
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#include <linux/posix_acl_xattr.h>
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#include <net/9p/9p.h>
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#include <net/9p/client.h>
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#include "fid.h"
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#include "xattr.h"
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ssize_t v9fs_fid_xattr_get(struct p9_fid *fid, const char *name,
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void *buffer, size_t buffer_size)
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{
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ssize_t retval;
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u64 attr_size;
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struct p9_fid *attr_fid;
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struct kvec kvec = {.iov_base = buffer, .iov_len = buffer_size};
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struct iov_iter to;
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int err;
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iov_iter_kvec(&to, ITER_DEST, &kvec, 1, buffer_size);
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attr_fid = p9_client_xattrwalk(fid, name, &attr_size);
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if (IS_ERR(attr_fid)) {
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retval = PTR_ERR(attr_fid);
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p9_debug(P9_DEBUG_VFS, "p9_client_attrwalk failed %zd\n",
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retval);
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return retval;
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}
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if (attr_size > buffer_size) {
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if (buffer_size)
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retval = -ERANGE;
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else if (attr_size > SSIZE_MAX)
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retval = -EOVERFLOW;
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else /* request to get the attr_size */
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retval = attr_size;
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} else {
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iov_iter_truncate(&to, attr_size);
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retval = p9_client_read(attr_fid, 0, &to, &err);
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if (err)
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retval = err;
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}
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p9_fid_put(attr_fid);
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return retval;
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}
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/*
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* v9fs_xattr_get()
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*
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* Copy an extended attribute into the buffer
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* provided, or compute the buffer size required.
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* Buffer is NULL to compute the size of the buffer required.
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*
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* Returns a negative error number on failure, or the number of bytes
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* used / required on success.
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*/
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ssize_t v9fs_xattr_get(struct dentry *dentry, const char *name,
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void *buffer, size_t buffer_size)
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{
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struct p9_fid *fid;
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int ret;
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p9_debug(P9_DEBUG_VFS, "name = %s value_len = %zu\n",
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name, buffer_size);
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fid = v9fs_fid_lookup(dentry);
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if (IS_ERR(fid))
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return PTR_ERR(fid);
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ret = v9fs_fid_xattr_get(fid, name, buffer, buffer_size);
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p9_fid_put(fid);
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return ret;
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}
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/*
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* v9fs_xattr_set()
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*
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* Create, replace or remove an extended attribute for this inode. Buffer
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* is NULL to remove an existing extended attribute, and non-NULL to
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* either replace an existing extended attribute, or create a new extended
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* attribute. The flags XATTR_REPLACE and XATTR_CREATE
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* specify that an extended attribute must exist and must not exist
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* previous to the call, respectively.
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*
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* Returns 0, or a negative error number on failure.
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*/
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int v9fs_xattr_set(struct dentry *dentry, const char *name,
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const void *value, size_t value_len, int flags)
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{
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int ret;
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struct p9_fid *fid;
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fid = v9fs_fid_lookup(dentry);
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if (IS_ERR(fid))
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return PTR_ERR(fid);
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ret = v9fs_fid_xattr_set(fid, name, value, value_len, flags);
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p9_fid_put(fid);
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return ret;
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}
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int v9fs_fid_xattr_set(struct p9_fid *fid, const char *name,
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const void *value, size_t value_len, int flags)
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{
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struct kvec kvec = {.iov_base = (void *)value, .iov_len = value_len};
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struct iov_iter from;
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int retval, err;
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iov_iter_kvec(&from, ITER_SOURCE, &kvec, 1, value_len);
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p9_debug(P9_DEBUG_VFS, "name = %s value_len = %zu flags = %d\n",
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name, value_len, flags);
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/* Clone it */
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fid = clone_fid(fid);
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if (IS_ERR(fid))
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return PTR_ERR(fid);
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/*
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* On success fid points to xattr
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*/
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retval = p9_client_xattrcreate(fid, name, value_len, flags);
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if (retval < 0)
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p9_debug(P9_DEBUG_VFS, "p9_client_xattrcreate failed %d\n",
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retval);
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else
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p9_client_write(fid, 0, &from, &retval);
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err = p9_fid_put(fid);
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if (!retval && err)
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retval = err;
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return retval;
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}
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ssize_t v9fs_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size)
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{
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return v9fs_xattr_get(dentry, NULL, buffer, buffer_size);
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}
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static int v9fs_xattr_handler_get(const struct xattr_handler *handler,
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struct dentry *dentry, struct inode *inode,
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const char *name, void *buffer, size_t size)
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{
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const char *full_name = xattr_full_name(handler, name);
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return v9fs_xattr_get(dentry, full_name, buffer, size);
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}
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static int v9fs_xattr_handler_set(const struct xattr_handler *handler,
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struct mnt_idmap *idmap,
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struct dentry *dentry, struct inode *inode,
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const char *name, const void *value,
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size_t size, int flags)
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{
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const char *full_name = xattr_full_name(handler, name);
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return v9fs_xattr_set(dentry, full_name, value, size, flags);
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}
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static struct xattr_handler v9fs_xattr_user_handler = {
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.prefix = XATTR_USER_PREFIX,
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.get = v9fs_xattr_handler_get,
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.set = v9fs_xattr_handler_set,
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};
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static struct xattr_handler v9fs_xattr_trusted_handler = {
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.prefix = XATTR_TRUSTED_PREFIX,
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.get = v9fs_xattr_handler_get,
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.set = v9fs_xattr_handler_set,
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};
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#ifdef CONFIG_9P_FS_SECURITY
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static struct xattr_handler v9fs_xattr_security_handler = {
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.prefix = XATTR_SECURITY_PREFIX,
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.get = v9fs_xattr_handler_get,
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.set = v9fs_xattr_handler_set,
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};
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#endif
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const struct xattr_handler *v9fs_xattr_handlers[] = {
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&v9fs_xattr_user_handler,
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&v9fs_xattr_trusted_handler,
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#ifdef CONFIG_9P_FS_SECURITY
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&v9fs_xattr_security_handler,
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#endif
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NULL
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};
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