1 files changed, 0 insertions, 523 deletions

diff --git a/drivers/staging/lustre/lustre/llite/xattr_cache.c b/drivers/staging/lustre/lustre/llite/xattr_cache.c
deleted file mode 100644
index 4dc799d60a9f..000000000000
--- a/drivers/staging/lustre/lustre/llite/xattr_cache.c
+++ /dev/null
@@ -1,523 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Copyright 2012 Xyratex Technology Limited
- *
- * Copyright (c) 2013, 2015, Intel Corporation.
- *
- * Author: Andrew Perepechko <Andrew_Perepechko@xyratex.com>
- *
- */
-
-#define DEBUG_SUBSYSTEM S_LLITE
-
-#include <linux/fs.h>
-#include <linux/sched.h>
-#include <linux/mm.h>
-#include <obd_support.h>
-#include <lustre_dlm.h>
-#include "llite_internal.h"
-
-/* If we ever have hundreds of extended attributes, we might want to consider
- * using a hash or a tree structure instead of list for faster lookups.
- */
-struct ll_xattr_entry {
-	struct list_head	xe_list;    /* protected with
-					     * lli_xattrs_list_rwsem
-					     */
-	char			*xe_name;   /* xattr name, \0-terminated */
-	char			*xe_value;  /* xattr value */
-	unsigned int		xe_namelen; /* strlen(xe_name) + 1 */
-	unsigned int		xe_vallen;  /* xattr value length */
-};
-
-static struct kmem_cache *xattr_kmem;
-static struct lu_kmem_descr xattr_caches[] = {
-	{
-		.ckd_cache = &xattr_kmem,
-		.ckd_name  = "xattr_kmem",
-		.ckd_size  = sizeof(struct ll_xattr_entry)
-	},
-	{
-		.ckd_cache = NULL
-	}
-};
-
-int ll_xattr_init(void)
-{
-	return lu_kmem_init(xattr_caches);
-}
-
-void ll_xattr_fini(void)
-{
-	lu_kmem_fini(xattr_caches);
-}
-
-/**
- * Initializes xattr cache for an inode.
- *
- * This initializes the xattr list and marks cache presence.
- */
-static void ll_xattr_cache_init(struct ll_inode_info *lli)
-{
-	INIT_LIST_HEAD(&lli->lli_xattrs);
-	set_bit(LLIF_XATTR_CACHE, &lli->lli_flags);
-}
-
-/**
- *  This looks for a specific extended attribute.
- *
- *  Find in @cache and return @xattr_name attribute in @xattr,
- *  for the NULL @xattr_name return the first cached @xattr.
- *
- *  \retval 0        success
- *  \retval -ENODATA if not found
- */
-static int ll_xattr_cache_find(struct list_head *cache,
-			       const char *xattr_name,
-			       struct ll_xattr_entry **xattr)
-{
-	struct ll_xattr_entry *entry;
-
-	list_for_each_entry(entry, cache, xe_list) {
-		/* xattr_name == NULL means look for any entry */
-		if (!xattr_name || strcmp(xattr_name, entry->xe_name) == 0) {
-			*xattr = entry;
-			CDEBUG(D_CACHE, "find: [%s]=%.*s\n",
-			       entry->xe_name, entry->xe_vallen,
-			       entry->xe_value);
-			return 0;
-		}
-	}
-
-	return -ENODATA;
-}
-
-/**
- * This adds an xattr.
- *
- * Add @xattr_name attr with @xattr_val value and @xattr_val_len length,
- *
- * \retval 0       success
- * \retval -ENOMEM if no memory could be allocated for the cached attr
- * \retval -EPROTO if duplicate xattr is being added
- */
-static int ll_xattr_cache_add(struct list_head *cache,
-			      const char *xattr_name,
-			      const char *xattr_val,
-			      unsigned int xattr_val_len)
-{
-	struct ll_xattr_entry *xattr;
-
-	if (ll_xattr_cache_find(cache, xattr_name, &xattr) == 0) {
-		CDEBUG(D_CACHE, "duplicate xattr: [%s]\n", xattr_name);
-		return -EPROTO;
-	}
-
-	xattr = kmem_cache_zalloc(xattr_kmem, GFP_NOFS);
-	if (!xattr) {
-		CDEBUG(D_CACHE, "failed to allocate xattr\n");
-		return -ENOMEM;
-	}
-
-	xattr->xe_name = kstrdup(xattr_name, GFP_NOFS);
-	if (!xattr->xe_name) {
-		CDEBUG(D_CACHE, "failed to alloc xattr name %u\n",
-		       xattr->xe_namelen);
-		goto err_name;
-	}
-	xattr->xe_value = kmemdup(xattr_val, xattr_val_len, GFP_NOFS);
-	if (!xattr->xe_value)
-		goto err_value;
-
-	xattr->xe_vallen = xattr_val_len;
-	list_add(&xattr->xe_list, cache);
-
-	CDEBUG(D_CACHE, "set: [%s]=%.*s\n", xattr_name, xattr_val_len,
-	       xattr_val);
-
-	return 0;
-err_value:
-	kfree(xattr->xe_name);
-err_name:
-	kmem_cache_free(xattr_kmem, xattr);
-
-	return -ENOMEM;
-}
-
-/**
- * This removes an extended attribute from cache.
- *
- * Remove @xattr_name attribute from @cache.
- *
- * \retval 0        success
- * \retval -ENODATA if @xattr_name is not cached
- */
-static int ll_xattr_cache_del(struct list_head *cache,
-			      const char *xattr_name)
-{
-	struct ll_xattr_entry *xattr;
-
-	CDEBUG(D_CACHE, "del xattr: %s\n", xattr_name);
-
-	if (ll_xattr_cache_find(cache, xattr_name, &xattr) == 0) {
-		list_del(&xattr->xe_list);
-		kfree(xattr->xe_name);
-		kfree(xattr->xe_value);
-		kmem_cache_free(xattr_kmem, xattr);
-
-		return 0;
-	}
-
-	return -ENODATA;
-}
-
-/**
- * This iterates cached extended attributes.
- *
- * Walk over cached attributes in @cache and
- * fill in @xld_buffer or only calculate buffer
- * size if @xld_buffer is NULL.
- *
- * \retval >= 0     buffer list size
- * \retval -ENODATA if the list cannot fit @xld_size buffer
- */
-static int ll_xattr_cache_list(struct list_head *cache,
-			       char *xld_buffer,
-			       int xld_size)
-{
-	struct ll_xattr_entry *xattr, *tmp;
-	int xld_tail = 0;
-
-	list_for_each_entry_safe(xattr, tmp, cache, xe_list) {
-		CDEBUG(D_CACHE, "list: buffer=%p[%d] name=%s\n",
-		       xld_buffer, xld_tail, xattr->xe_name);
-
-		if (xld_buffer) {
-			xld_size -= xattr->xe_namelen;
-			if (xld_size < 0)
-				break;
-			memcpy(&xld_buffer[xld_tail],
-			       xattr->xe_name, xattr->xe_namelen);
-		}
-		xld_tail += xattr->xe_namelen;
-	}
-
-	if (xld_size < 0)
-		return -ERANGE;
-
-	return xld_tail;
-}
-
-/**
- * Check if the xattr cache is initialized (filled).
- *
- * \retval 0 @cache is not initialized
- * \retval 1 @cache is initialized
- */
-static int ll_xattr_cache_valid(struct ll_inode_info *lli)
-{
-	return test_bit(LLIF_XATTR_CACHE, &lli->lli_flags);
-}
-
-/**
- * This finalizes the xattr cache.
- *
- * Free all xattr memory. @lli is the inode info pointer.
- *
- * \retval 0 no error occurred
- */
-static int ll_xattr_cache_destroy_locked(struct ll_inode_info *lli)
-{
-	if (!ll_xattr_cache_valid(lli))
-		return 0;
-
-	while (ll_xattr_cache_del(&lli->lli_xattrs, NULL) == 0)
-		; /* empty loop */
-
-	clear_bit(LLIF_XATTR_CACHE, &lli->lli_flags);
-
-	return 0;
-}
-
-int ll_xattr_cache_destroy(struct inode *inode)
-{
-	struct ll_inode_info *lli = ll_i2info(inode);
-	int rc;
-
-	down_write(&lli->lli_xattrs_list_rwsem);
-	rc = ll_xattr_cache_destroy_locked(lli);
-	up_write(&lli->lli_xattrs_list_rwsem);
-
-	return rc;
-}
-
-/**
- * Match or enqueue a PR lock.
- *
- * Find or request an LDLM lock with xattr data.
- * Since LDLM does not provide API for atomic match_or_enqueue,
- * the function handles it with a separate enq lock.
- * If successful, the function exits with the list lock held.
- *
- * \retval 0       no error occurred
- * \retval -ENOMEM not enough memory
- */
-static int ll_xattr_find_get_lock(struct inode *inode,
-				  struct lookup_intent *oit,
-				  struct ptlrpc_request **req)
-{
-	enum ldlm_mode mode;
-	struct lustre_handle lockh = { 0 };
-	struct md_op_data *op_data;
-	struct ll_inode_info *lli = ll_i2info(inode);
-	struct ldlm_enqueue_info einfo = {
-		.ei_type = LDLM_IBITS,
-		.ei_mode = it_to_lock_mode(oit),
-		.ei_cb_bl = &ll_md_blocking_ast,
-		.ei_cb_cp = &ldlm_completion_ast,
-	};
-	struct ll_sb_info *sbi = ll_i2sbi(inode);
-	struct obd_export *exp = sbi->ll_md_exp;
-	int rc;
-
-	mutex_lock(&lli->lli_xattrs_enq_lock);
-	/* inode may have been shrunk and recreated, so data is gone, match lock
-	 * only when data exists.
-	 */
-	if (ll_xattr_cache_valid(lli)) {
-		/* Try matching first. */
-		mode = ll_take_md_lock(inode, MDS_INODELOCK_XATTR, &lockh, 0,
-				       LCK_PR);
-		if (mode != 0) {
-			/* fake oit in mdc_revalidate_lock() manner */
-			oit->it_lock_handle = lockh.cookie;
-			oit->it_lock_mode = mode;
-			goto out;
-		}
-	}
-
-	/* Enqueue if the lock isn't cached locally. */
-	op_data = ll_prep_md_op_data(NULL, inode, NULL, NULL, 0, 0,
-				     LUSTRE_OPC_ANY, NULL);
-	if (IS_ERR(op_data)) {
-		mutex_unlock(&lli->lli_xattrs_enq_lock);
-		return PTR_ERR(op_data);
-	}
-
-	op_data->op_valid = OBD_MD_FLXATTR | OBD_MD_FLXATTRLS;
-
-	rc = md_enqueue(exp, &einfo, NULL, oit, op_data, &lockh, 0);
-	ll_finish_md_op_data(op_data);
-
-	if (rc < 0) {
-		CDEBUG(D_CACHE,
-		       "md_intent_lock failed with %d for fid " DFID "\n",
-		       rc, PFID(ll_inode2fid(inode)));
-		mutex_unlock(&lli->lli_xattrs_enq_lock);
-		return rc;
-	}
-
-	*req = oit->it_request;
-out:
-	down_write(&lli->lli_xattrs_list_rwsem);
-	mutex_unlock(&lli->lli_xattrs_enq_lock);
-
-	return 0;
-}
-
-/**
- * Refill the xattr cache.
- *
- * Fetch and cache the whole of xattrs for @inode, acquiring
- * a read or a write xattr lock depending on operation in @oit.
- * Intent is dropped on exit unless the operation is setxattr.
- *
- * \retval 0       no error occurred
- * \retval -EPROTO network protocol error
- * \retval -ENOMEM not enough memory for the cache
- */
-static int ll_xattr_cache_refill(struct inode *inode, struct lookup_intent *oit)
-{
-	struct ll_sb_info *sbi = ll_i2sbi(inode);
-	struct ptlrpc_request *req = NULL;
-	const char *xdata, *xval, *xtail, *xvtail;
-	struct ll_inode_info *lli = ll_i2info(inode);
-	struct mdt_body *body;
-	__u32 *xsizes;
-	int rc, i;
-
-	rc = ll_xattr_find_get_lock(inode, oit, &req);
-	if (rc)
-		goto out_no_unlock;
-
-	/* Do we have the data at this point? */
-	if (ll_xattr_cache_valid(lli)) {
-		ll_stats_ops_tally(sbi, LPROC_LL_GETXATTR_HITS, 1);
-		rc = 0;
-		goto out_maybe_drop;
-	}
-
-	/* Matched but no cache? Cancelled on error by a parallel refill. */
-	if (unlikely(!req)) {
-		CDEBUG(D_CACHE, "cancelled by a parallel getxattr\n");
-		rc = -EIO;
-		goto out_maybe_drop;
-	}
-
-	if (oit->it_status < 0) {
-		CDEBUG(D_CACHE,
-		       "getxattr intent returned %d for fid " DFID "\n",
-		       oit->it_status, PFID(ll_inode2fid(inode)));
-		rc = oit->it_status;
-		/* xattr data is so large that we don't want to cache it */
-		if (rc == -ERANGE)
-			rc = -EAGAIN;
-		goto out_destroy;
-	}
-
-	body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
-	if (!body) {
-		CERROR("no MDT BODY in the refill xattr reply\n");
-		rc = -EPROTO;
-		goto out_destroy;
-	}
-	/* do not need swab xattr data */
-	xdata = req_capsule_server_sized_get(&req->rq_pill, &RMF_EADATA,
-					     body->mbo_eadatasize);
-	xval = req_capsule_server_sized_get(&req->rq_pill, &RMF_EAVALS,
-					    body->mbo_aclsize);
-	xsizes = req_capsule_server_sized_get(&req->rq_pill, &RMF_EAVALS_LENS,
-					      body->mbo_max_mdsize * sizeof(__u32));
-	if (!xdata || !xval || !xsizes) {
-		CERROR("wrong setxattr reply\n");
-		rc = -EPROTO;
-		goto out_destroy;
-	}
-
-	xtail = xdata + body->mbo_eadatasize;
-	xvtail = xval + body->mbo_aclsize;
-
-	CDEBUG(D_CACHE, "caching: xdata=%p xtail=%p\n", xdata, xtail);
-
-	ll_xattr_cache_init(lli);
-
-	for (i = 0; i < body->mbo_max_mdsize; i++) {
-		CDEBUG(D_CACHE, "caching [%s]=%.*s\n", xdata, *xsizes, xval);
-		/* Perform consistency checks: attr names and vals in pill */
-		if (!memchr(xdata, 0, xtail - xdata)) {
-			CERROR("xattr protocol violation (names are broken)\n");
-			rc = -EPROTO;
-		} else if (xval + *xsizes > xvtail) {
-			CERROR("xattr protocol violation (vals are broken)\n");
-			rc = -EPROTO;
-		} else if (OBD_FAIL_CHECK(OBD_FAIL_LLITE_XATTR_ENOMEM)) {
-			rc = -ENOMEM;
-		} else if (!strcmp(xdata, XATTR_NAME_ACL_ACCESS)) {
-			/* Filter out ACL ACCESS since it's cached separately */
-			CDEBUG(D_CACHE, "not caching %s\n",
-			       XATTR_NAME_ACL_ACCESS);
-			rc = 0;
-		} else if (!strcmp(xdata, "security.selinux")) {
-			/* Filter out security.selinux, it is cached in slab */
-			CDEBUG(D_CACHE, "not caching security.selinux\n");
-			rc = 0;
-		} else {
-			rc = ll_xattr_cache_add(&lli->lli_xattrs, xdata, xval,
-						*xsizes);
-		}
-		if (rc < 0) {
-			ll_xattr_cache_destroy_locked(lli);
-			goto out_destroy;
-		}
-		xdata += strlen(xdata) + 1;
-		xval  += *xsizes;
-		xsizes++;
-	}
-
-	if (xdata != xtail || xval != xvtail)
-		CERROR("a hole in xattr data\n");
-
-	ll_set_lock_data(sbi->ll_md_exp, inode, oit, NULL);
-
-	goto out_maybe_drop;
-out_maybe_drop:
-
-		ll_intent_drop_lock(oit);
-
-	if (rc != 0)
-		up_write(&lli->lli_xattrs_list_rwsem);
-out_no_unlock:
-	ptlrpc_req_finished(req);
-
-	return rc;
-
-out_destroy:
-	up_write(&lli->lli_xattrs_list_rwsem);
-
-	ldlm_lock_decref_and_cancel((struct lustre_handle *)
-					&oit->it_lock_handle,
-					oit->it_lock_mode);
-
-	goto out_no_unlock;
-}
-
-/**
- * Get an xattr value or list xattrs using the write-through cache.
- *
- * Get the xattr value (@valid has OBD_MD_FLXATTR set) of @name or
- * list xattr names (@valid has OBD_MD_FLXATTRLS set) for @inode.
- * The resulting value/list is stored in @buffer if the former
- * is not larger than @size.
- *
- * \retval 0        no error occurred
- * \retval -EPROTO  network protocol error
- * \retval -ENOMEM  not enough memory for the cache
- * \retval -ERANGE  the buffer is not large enough
- * \retval -ENODATA no such attr or the list is empty
- */
-int ll_xattr_cache_get(struct inode *inode, const char *name, char *buffer,
-		       size_t size, __u64 valid)
-{
-	struct lookup_intent oit = { .it_op = IT_GETXATTR };
-	struct ll_inode_info *lli = ll_i2info(inode);
-	int rc = 0;
-
-	LASSERT(!!(valid & OBD_MD_FLXATTR) ^ !!(valid & OBD_MD_FLXATTRLS));
-
-	down_read(&lli->lli_xattrs_list_rwsem);
-	if (!ll_xattr_cache_valid(lli)) {
-		up_read(&lli->lli_xattrs_list_rwsem);
-		rc = ll_xattr_cache_refill(inode, &oit);
-		if (rc)
-			return rc;
-		downgrade_write(&lli->lli_xattrs_list_rwsem);
-	} else {
-		ll_stats_ops_tally(ll_i2sbi(inode), LPROC_LL_GETXATTR_HITS, 1);
-	}
-
-	if (valid & OBD_MD_FLXATTR) {
-		struct ll_xattr_entry *xattr;
-
-		rc = ll_xattr_cache_find(&lli->lli_xattrs, name, &xattr);
-		if (rc == 0) {
-			rc = xattr->xe_vallen;
-			/* zero size means we are only requested size in rc */
-			if (size != 0) {
-				if (size >= xattr->xe_vallen)
-					memcpy(buffer, xattr->xe_value,
-					       xattr->xe_vallen);
-				else
-					rc = -ERANGE;
-			}
-		}
-	} else if (valid & OBD_MD_FLXATTRLS) {
-		rc = ll_xattr_cache_list(&lli->lli_xattrs,
-					 size ? buffer : NULL, size);
-	}
-
-	goto out;
-out:
-	up_read(&lli->lli_xattrs_list_rwsem);
-
-	return rc;
-}