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linux-sg2042/fs/ocfs2/xattr.c

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/* -*- mode: c; c-basic-offset: 8; -*-
* vim: noexpandtab sw=8 ts=8 sts=0:
*
* xattr.c
*
* Copyright (C) 2008 Oracle. All rights reserved.
*
* CREDITS:
* Lots of code in this file is taken from ext3.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this program; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 021110-1307, USA.
*/
#include <linux/capability.h>
#include <linux/fs.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/highmem.h>
#include <linux/pagemap.h>
#include <linux/uio.h>
#include <linux/sched.h>
#include <linux/splice.h>
#include <linux/mount.h>
#include <linux/writeback.h>
#include <linux/falloc.h>
#include <linux/sort.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/string.h>
#define MLOG_MASK_PREFIX ML_XATTR
#include <cluster/masklog.h>
#include "ocfs2.h"
#include "alloc.h"
#include "dlmglue.h"
#include "file.h"
#include "symlink.h"
#include "sysfile.h"
#include "inode.h"
#include "journal.h"
#include "ocfs2_fs.h"
#include "suballoc.h"
#include "uptodate.h"
#include "buffer_head_io.h"
#include "super.h"
#include "xattr.h"
struct ocfs2_xattr_def_value_root {
struct ocfs2_xattr_value_root xv;
struct ocfs2_extent_rec er;
};
struct ocfs2_xattr_bucket {
struct buffer_head *bhs[OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET];
struct ocfs2_xattr_header *xh;
};
#define OCFS2_XATTR_ROOT_SIZE (sizeof(struct ocfs2_xattr_def_value_root))
#define OCFS2_XATTR_INLINE_SIZE 80
static struct ocfs2_xattr_def_value_root def_xv = {
.xv.xr_list.l_count = cpu_to_le16(1),
};
struct xattr_handler *ocfs2_xattr_handlers[] = {
&ocfs2_xattr_user_handler,
&ocfs2_xattr_trusted_handler,
NULL
};
static struct xattr_handler *ocfs2_xattr_handler_map[] = {
[OCFS2_XATTR_INDEX_USER] = &ocfs2_xattr_user_handler,
[OCFS2_XATTR_INDEX_TRUSTED] = &ocfs2_xattr_trusted_handler,
};
struct ocfs2_xattr_info {
int name_index;
const char *name;
const void *value;
size_t value_len;
};
struct ocfs2_xattr_search {
struct buffer_head *inode_bh;
/*
* xattr_bh point to the block buffer head which has extended attribute
* when extended attribute in inode, xattr_bh is equal to inode_bh.
*/
struct buffer_head *xattr_bh;
struct ocfs2_xattr_header *header;
struct ocfs2_xattr_bucket bucket;
void *base;
void *end;
struct ocfs2_xattr_entry *here;
int not_found;
};
static int ocfs2_xattr_bucket_get_name_value(struct inode *inode,
struct ocfs2_xattr_header *xh,
int index,
int *block_off,
int *new_offset);
static int ocfs2_xattr_index_block_find(struct inode *inode,
struct buffer_head *root_bh,
int name_index,
const char *name,
struct ocfs2_xattr_search *xs);
static int ocfs2_xattr_tree_list_index_block(struct inode *inode,
struct ocfs2_xattr_tree_root *xt,
char *buffer,
size_t buffer_size);
static int ocfs2_xattr_create_index_block(struct inode *inode,
struct ocfs2_xattr_search *xs);
static int ocfs2_xattr_set_entry_index_block(struct inode *inode,
struct ocfs2_xattr_info *xi,
struct ocfs2_xattr_search *xs);
static int ocfs2_delete_xattr_index_block(struct inode *inode,
struct buffer_head *xb_bh);
static inline const char *ocfs2_xattr_prefix(int name_index)
{
struct xattr_handler *handler = NULL;
if (name_index > 0 && name_index < OCFS2_XATTR_MAX)
handler = ocfs2_xattr_handler_map[name_index];
return handler ? handler->prefix : NULL;
}
static u32 ocfs2_xattr_name_hash(struct inode *inode,
const char *name,
int name_len)
{
/* Get hash value of uuid from super block */
u32 hash = OCFS2_SB(inode->i_sb)->uuid_hash;
int i;
/* hash extended attribute name */
for (i = 0; i < name_len; i++) {
hash = (hash << OCFS2_HASH_SHIFT) ^
(hash >> (8*sizeof(hash) - OCFS2_HASH_SHIFT)) ^
*name++;
}
return hash;
}
/*
* ocfs2_xattr_hash_entry()
*
* Compute the hash of an extended attribute.
*/
static void ocfs2_xattr_hash_entry(struct inode *inode,
struct ocfs2_xattr_header *header,
struct ocfs2_xattr_entry *entry)
{
u32 hash = 0;
char *name = (char *)header + le16_to_cpu(entry->xe_name_offset);
hash = ocfs2_xattr_name_hash(inode, name, entry->xe_name_len);
entry->xe_name_hash = cpu_to_le32(hash);
return;
}
static int ocfs2_xattr_extend_allocation(struct inode *inode,
u32 clusters_to_add,
struct buffer_head *xattr_bh,
struct ocfs2_xattr_value_root *xv)
{
int status = 0;
int restart_func = 0;
int credits = 0;
handle_t *handle = NULL;
struct ocfs2_alloc_context *data_ac = NULL;
struct ocfs2_alloc_context *meta_ac = NULL;
enum ocfs2_alloc_restarted why;
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
u32 prev_clusters, logical_start = le32_to_cpu(xv->xr_clusters);
struct ocfs2_extent_tree et;
mlog(0, "(clusters_to_add for xattr= %u)\n", clusters_to_add);
ocfs2_init_xattr_value_extent_tree(&et, inode, xattr_bh, xv);
restart_all:
status = ocfs2_lock_allocators(inode, &et, clusters_to_add, 0,
&data_ac, &meta_ac);
if (status) {
mlog_errno(status);
goto leave;
}
credits = ocfs2_calc_extend_credits(osb->sb, et.et_root_el,
clusters_to_add);
handle = ocfs2_start_trans(osb, credits);
if (IS_ERR(handle)) {
status = PTR_ERR(handle);
handle = NULL;
mlog_errno(status);
goto leave;
}
restarted_transaction:
status = ocfs2_journal_access(handle, inode, xattr_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (status < 0) {
mlog_errno(status);
goto leave;
}
prev_clusters = le32_to_cpu(xv->xr_clusters);
status = ocfs2_add_clusters_in_btree(osb,
inode,
&logical_start,
clusters_to_add,
0,
&et,
handle,
data_ac,
meta_ac,
&why);
if ((status < 0) && (status != -EAGAIN)) {
if (status != -ENOSPC)
mlog_errno(status);
goto leave;
}
status = ocfs2_journal_dirty(handle, xattr_bh);
if (status < 0) {
mlog_errno(status);
goto leave;
}
clusters_to_add -= le32_to_cpu(xv->xr_clusters) - prev_clusters;
if (why != RESTART_NONE && clusters_to_add) {
if (why == RESTART_META) {
mlog(0, "restarting function.\n");
restart_func = 1;
} else {
BUG_ON(why != RESTART_TRANS);
mlog(0, "restarting transaction.\n");
/* TODO: This can be more intelligent. */
credits = ocfs2_calc_extend_credits(osb->sb,
et.et_root_el,
clusters_to_add);
status = ocfs2_extend_trans(handle, credits);
if (status < 0) {
/* handle still has to be committed at
* this point. */
status = -ENOMEM;
mlog_errno(status);
goto leave;
}
goto restarted_transaction;
}
}
leave:
if (handle) {
ocfs2_commit_trans(osb, handle);
handle = NULL;
}
if (data_ac) {
ocfs2_free_alloc_context(data_ac);
data_ac = NULL;
}
if (meta_ac) {
ocfs2_free_alloc_context(meta_ac);
meta_ac = NULL;
}
if ((!status) && restart_func) {
restart_func = 0;
goto restart_all;
}
return status;
}
static int __ocfs2_remove_xattr_range(struct inode *inode,
struct buffer_head *root_bh,
struct ocfs2_xattr_value_root *xv,
u32 cpos, u32 phys_cpos, u32 len,
struct ocfs2_cached_dealloc_ctxt *dealloc)
{
int ret;
u64 phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
struct inode *tl_inode = osb->osb_tl_inode;
handle_t *handle;
struct ocfs2_alloc_context *meta_ac = NULL;
struct ocfs2_extent_tree et;
ocfs2_init_xattr_value_extent_tree(&et, inode, root_bh, xv);
ret = ocfs2_lock_allocators(inode, &et, 0, 1, NULL, &meta_ac);
if (ret) {
mlog_errno(ret);
return ret;
}
mutex_lock(&tl_inode->i_mutex);
if (ocfs2_truncate_log_needs_flush(osb)) {
ret = __ocfs2_flush_truncate_log(osb);
if (ret < 0) {
mlog_errno(ret);
goto out;
}
}
handle = ocfs2_start_trans(osb, OCFS2_REMOVE_EXTENT_CREDITS);
if (IS_ERR(handle)) {
ret = PTR_ERR(handle);
mlog_errno(ret);
goto out;
}
ret = ocfs2_journal_access(handle, inode, root_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (ret) {
mlog_errno(ret);
goto out_commit;
}
ret = ocfs2_remove_extent(inode, &et, cpos, len, handle, meta_ac,
dealloc);
if (ret) {
mlog_errno(ret);
goto out_commit;
}
le32_add_cpu(&xv->xr_clusters, -len);
ret = ocfs2_journal_dirty(handle, root_bh);
if (ret) {
mlog_errno(ret);
goto out_commit;
}
ret = ocfs2_truncate_log_append(osb, handle, phys_blkno, len);
if (ret)
mlog_errno(ret);
out_commit:
ocfs2_commit_trans(osb, handle);
out:
mutex_unlock(&tl_inode->i_mutex);
if (meta_ac)
ocfs2_free_alloc_context(meta_ac);
return ret;
}
static int ocfs2_xattr_shrink_size(struct inode *inode,
u32 old_clusters,
u32 new_clusters,
struct buffer_head *root_bh,
struct ocfs2_xattr_value_root *xv)
{
int ret = 0;
u32 trunc_len, cpos, phys_cpos, alloc_size;
u64 block;
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
struct ocfs2_cached_dealloc_ctxt dealloc;
ocfs2_init_dealloc_ctxt(&dealloc);
if (old_clusters <= new_clusters)
return 0;
cpos = new_clusters;
trunc_len = old_clusters - new_clusters;
while (trunc_len) {
ret = ocfs2_xattr_get_clusters(inode, cpos, &phys_cpos,
&alloc_size, &xv->xr_list);
if (ret) {
mlog_errno(ret);
goto out;
}
if (alloc_size > trunc_len)
alloc_size = trunc_len;
ret = __ocfs2_remove_xattr_range(inode, root_bh, xv, cpos,
phys_cpos, alloc_size,
&dealloc);
if (ret) {
mlog_errno(ret);
goto out;
}
block = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
ocfs2_remove_xattr_clusters_from_cache(inode, block,
alloc_size);
cpos += alloc_size;
trunc_len -= alloc_size;
}
out:
ocfs2_schedule_truncate_log_flush(osb, 1);
ocfs2_run_deallocs(osb, &dealloc);
return ret;
}
static int ocfs2_xattr_value_truncate(struct inode *inode,
struct buffer_head *root_bh,
struct ocfs2_xattr_value_root *xv,
int len)
{
int ret;
u32 new_clusters = ocfs2_clusters_for_bytes(inode->i_sb, len);
u32 old_clusters = le32_to_cpu(xv->xr_clusters);
if (new_clusters == old_clusters)
return 0;
if (new_clusters > old_clusters)
ret = ocfs2_xattr_extend_allocation(inode,
new_clusters - old_clusters,
root_bh, xv);
else
ret = ocfs2_xattr_shrink_size(inode,
old_clusters, new_clusters,
root_bh, xv);
return ret;
}
static int ocfs2_xattr_list_entry(char *buffer, size_t size,
size_t *result, const char *prefix,
const char *name, int name_len)
{
char *p = buffer + *result;
int prefix_len = strlen(prefix);
int total_len = prefix_len + name_len + 1;
*result += total_len;
/* we are just looking for how big our buffer needs to be */
if (!size)
return 0;
if (*result > size)
return -ERANGE;
memcpy(p, prefix, prefix_len);
memcpy(p + prefix_len, name, name_len);
p[prefix_len + name_len] = '\0';
return 0;
}
static int ocfs2_xattr_list_entries(struct inode *inode,
struct ocfs2_xattr_header *header,
char *buffer, size_t buffer_size)
{
size_t result = 0;
int i, type, ret;
const char *prefix, *name;
for (i = 0 ; i < le16_to_cpu(header->xh_count); i++) {
struct ocfs2_xattr_entry *entry = &header->xh_entries[i];
type = ocfs2_xattr_get_type(entry);
prefix = ocfs2_xattr_prefix(type);
if (prefix) {
name = (const char *)header +
le16_to_cpu(entry->xe_name_offset);
ret = ocfs2_xattr_list_entry(buffer, buffer_size,
&result, prefix, name,
entry->xe_name_len);
if (ret)
return ret;
}
}
return result;
}
static int ocfs2_xattr_ibody_list(struct inode *inode,
struct ocfs2_dinode *di,
char *buffer,
size_t buffer_size)
{
struct ocfs2_xattr_header *header = NULL;
struct ocfs2_inode_info *oi = OCFS2_I(inode);
int ret = 0;
if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL))
return ret;
header = (struct ocfs2_xattr_header *)
((void *)di + inode->i_sb->s_blocksize -
le16_to_cpu(di->i_xattr_inline_size));
ret = ocfs2_xattr_list_entries(inode, header, buffer, buffer_size);
return ret;
}
static int ocfs2_xattr_block_list(struct inode *inode,
struct ocfs2_dinode *di,
char *buffer,
size_t buffer_size)
{
struct buffer_head *blk_bh = NULL;
struct ocfs2_xattr_block *xb;
int ret = 0;
if (!di->i_xattr_loc)
return ret;
ret = ocfs2_read_block(inode, le64_to_cpu(di->i_xattr_loc), &blk_bh);
if (ret < 0) {
mlog_errno(ret);
return ret;
}
/*Verify the signature of xattr block*/
if (memcmp((void *)blk_bh->b_data, OCFS2_XATTR_BLOCK_SIGNATURE,
strlen(OCFS2_XATTR_BLOCK_SIGNATURE))) {
ret = -EFAULT;
goto cleanup;
}
xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
struct ocfs2_xattr_header *header = &xb->xb_attrs.xb_header;
ret = ocfs2_xattr_list_entries(inode, header,
buffer, buffer_size);
} else {
struct ocfs2_xattr_tree_root *xt = &xb->xb_attrs.xb_root;
ret = ocfs2_xattr_tree_list_index_block(inode, xt,
buffer, buffer_size);
}
cleanup:
brelse(blk_bh);
return ret;
}
ssize_t ocfs2_listxattr(struct dentry *dentry,
char *buffer,
size_t size)
{
int ret = 0, i_ret = 0, b_ret = 0;
struct buffer_head *di_bh = NULL;
struct ocfs2_dinode *di = NULL;
struct ocfs2_inode_info *oi = OCFS2_I(dentry->d_inode);
if (!ocfs2_supports_xattr(OCFS2_SB(dentry->d_sb)))
return -EOPNOTSUPP;
if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
return ret;
ret = ocfs2_inode_lock(dentry->d_inode, &di_bh, 0);
if (ret < 0) {
mlog_errno(ret);
return ret;
}
di = (struct ocfs2_dinode *)di_bh->b_data;
down_read(&oi->ip_xattr_sem);
i_ret = ocfs2_xattr_ibody_list(dentry->d_inode, di, buffer, size);
if (i_ret < 0)
b_ret = 0;
else {
if (buffer) {
buffer += i_ret;
size -= i_ret;
}
b_ret = ocfs2_xattr_block_list(dentry->d_inode, di,
buffer, size);
if (b_ret < 0)
i_ret = 0;
}
up_read(&oi->ip_xattr_sem);
ocfs2_inode_unlock(dentry->d_inode, 0);
brelse(di_bh);
return i_ret + b_ret;
}
static int ocfs2_xattr_find_entry(int name_index,
const char *name,
struct ocfs2_xattr_search *xs)
{
struct ocfs2_xattr_entry *entry;
size_t name_len;
int i, cmp = 1;
if (name == NULL)
return -EINVAL;
name_len = strlen(name);
entry = xs->here;
for (i = 0; i < le16_to_cpu(xs->header->xh_count); i++) {
cmp = name_index - ocfs2_xattr_get_type(entry);
if (!cmp)
cmp = name_len - entry->xe_name_len;
if (!cmp)
cmp = memcmp(name, (xs->base +
le16_to_cpu(entry->xe_name_offset)),
name_len);
if (cmp == 0)
break;
entry += 1;
}
xs->here = entry;
return cmp ? -ENODATA : 0;
}
static int ocfs2_xattr_get_value_outside(struct inode *inode,
struct ocfs2_xattr_value_root *xv,
void *buffer,
size_t len)
{
u32 cpos, p_cluster, num_clusters, bpc, clusters;
u64 blkno;
int i, ret = 0;
size_t cplen, blocksize;
struct buffer_head *bh = NULL;
struct ocfs2_extent_list *el;
el = &xv->xr_list;
clusters = le32_to_cpu(xv->xr_clusters);
bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
blocksize = inode->i_sb->s_blocksize;
cpos = 0;
while (cpos < clusters) {
ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
&num_clusters, el);
if (ret) {
mlog_errno(ret);
goto out;
}
blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster);
/* Copy ocfs2_xattr_value */
for (i = 0; i < num_clusters * bpc; i++, blkno++) {
ret = ocfs2_read_block(inode, blkno, &bh);
if (ret) {
mlog_errno(ret);
goto out;
}
cplen = len >= blocksize ? blocksize : len;
memcpy(buffer, bh->b_data, cplen);
len -= cplen;
buffer += cplen;
brelse(bh);
bh = NULL;
if (len == 0)
break;
}
cpos += num_clusters;
}
out:
return ret;
}
static int ocfs2_xattr_ibody_get(struct inode *inode,
int name_index,
const char *name,
void *buffer,
size_t buffer_size,
struct ocfs2_xattr_search *xs)
{
struct ocfs2_inode_info *oi = OCFS2_I(inode);
struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
struct ocfs2_xattr_value_root *xv;
size_t size;
int ret = 0;
if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL))
return -ENODATA;
xs->end = (void *)di + inode->i_sb->s_blocksize;
xs->header = (struct ocfs2_xattr_header *)
(xs->end - le16_to_cpu(di->i_xattr_inline_size));
xs->base = (void *)xs->header;
xs->here = xs->header->xh_entries;
ret = ocfs2_xattr_find_entry(name_index, name, xs);
if (ret)
return ret;
size = le64_to_cpu(xs->here->xe_value_size);
if (buffer) {
if (size > buffer_size)
return -ERANGE;
if (ocfs2_xattr_is_local(xs->here)) {
memcpy(buffer, (void *)xs->base +
le16_to_cpu(xs->here->xe_name_offset) +
OCFS2_XATTR_SIZE(xs->here->xe_name_len), size);
} else {
xv = (struct ocfs2_xattr_value_root *)
(xs->base + le16_to_cpu(
xs->here->xe_name_offset) +
OCFS2_XATTR_SIZE(xs->here->xe_name_len));
ret = ocfs2_xattr_get_value_outside(inode, xv,
buffer, size);
if (ret < 0) {
mlog_errno(ret);
return ret;
}
}
}
return size;
}
static int ocfs2_xattr_block_get(struct inode *inode,
int name_index,
const char *name,
void *buffer,
size_t buffer_size,
struct ocfs2_xattr_search *xs)
{
struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
struct buffer_head *blk_bh = NULL;
struct ocfs2_xattr_block *xb;
struct ocfs2_xattr_value_root *xv;
size_t size;
int ret = -ENODATA, name_offset, name_len, block_off, i;
if (!di->i_xattr_loc)
return ret;
memset(&xs->bucket, 0, sizeof(xs->bucket));
ret = ocfs2_read_block(inode, le64_to_cpu(di->i_xattr_loc), &blk_bh);
if (ret < 0) {
mlog_errno(ret);
return ret;
}
/*Verify the signature of xattr block*/
if (memcmp((void *)blk_bh->b_data, OCFS2_XATTR_BLOCK_SIGNATURE,
strlen(OCFS2_XATTR_BLOCK_SIGNATURE))) {
ret = -EFAULT;
goto cleanup;
}
xs->xattr_bh = blk_bh;
xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
xs->header = &xb->xb_attrs.xb_header;
xs->base = (void *)xs->header;
xs->end = (void *)(blk_bh->b_data) + blk_bh->b_size;
xs->here = xs->header->xh_entries;
ret = ocfs2_xattr_find_entry(name_index, name, xs);
} else
ret = ocfs2_xattr_index_block_find(inode, blk_bh,
name_index,
name, xs);
if (ret)
goto cleanup;
size = le64_to_cpu(xs->here->xe_value_size);
if (buffer) {
ret = -ERANGE;
if (size > buffer_size)
goto cleanup;
name_offset = le16_to_cpu(xs->here->xe_name_offset);
name_len = OCFS2_XATTR_SIZE(xs->here->xe_name_len);
i = xs->here - xs->header->xh_entries;
if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
ret = ocfs2_xattr_bucket_get_name_value(inode,
xs->bucket.xh,
i,
&block_off,
&name_offset);
xs->base = xs->bucket.bhs[block_off]->b_data;
}
if (ocfs2_xattr_is_local(xs->here)) {
memcpy(buffer, (void *)xs->base +
name_offset + name_len, size);
} else {
xv = (struct ocfs2_xattr_value_root *)
(xs->base + name_offset + name_len);
ret = ocfs2_xattr_get_value_outside(inode, xv,
buffer, size);
if (ret < 0) {
mlog_errno(ret);
goto cleanup;
}
}
}
ret = size;
cleanup:
for (i = 0; i < OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET; i++)
brelse(xs->bucket.bhs[i]);
memset(&xs->bucket, 0, sizeof(xs->bucket));
brelse(blk_bh);
return ret;
}
/* ocfs2_xattr_get()
*
* Copy an extended attribute into the buffer provided.
* Buffer is NULL to compute the size of buffer required.
*/
int ocfs2_xattr_get(struct inode *inode,
int name_index,
const char *name,
void *buffer,
size_t buffer_size)
{
int ret;
struct ocfs2_dinode *di = NULL;
struct buffer_head *di_bh = NULL;
struct ocfs2_inode_info *oi = OCFS2_I(inode);
struct ocfs2_xattr_search xis = {
.not_found = -ENODATA,
};
struct ocfs2_xattr_search xbs = {
.not_found = -ENODATA,
};
if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
return -EOPNOTSUPP;
if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
ret = -ENODATA;
ret = ocfs2_inode_lock(inode, &di_bh, 0);
if (ret < 0) {
mlog_errno(ret);
return ret;
}
xis.inode_bh = xbs.inode_bh = di_bh;
di = (struct ocfs2_dinode *)di_bh->b_data;
down_read(&oi->ip_xattr_sem);
ret = ocfs2_xattr_ibody_get(inode, name_index, name, buffer,
buffer_size, &xis);
if (ret == -ENODATA)
ret = ocfs2_xattr_block_get(inode, name_index, name, buffer,
buffer_size, &xbs);
up_read(&oi->ip_xattr_sem);
ocfs2_inode_unlock(inode, 0);
brelse(di_bh);
return ret;
}
static int __ocfs2_xattr_set_value_outside(struct inode *inode,
struct ocfs2_xattr_value_root *xv,
const void *value,
int value_len)
{
int ret = 0, i, cp_len, credits;
u16 blocksize = inode->i_sb->s_blocksize;
u32 p_cluster, num_clusters;
u32 cpos = 0, bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
u32 clusters = ocfs2_clusters_for_bytes(inode->i_sb, value_len);
u64 blkno;
struct buffer_head *bh = NULL;
handle_t *handle;
BUG_ON(clusters > le32_to_cpu(xv->xr_clusters));
credits = clusters * bpc;
handle = ocfs2_start_trans(OCFS2_SB(inode->i_sb), credits);
if (IS_ERR(handle)) {
ret = PTR_ERR(handle);
mlog_errno(ret);
goto out;
}
while (cpos < clusters) {
ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
&num_clusters, &xv->xr_list);
if (ret) {
mlog_errno(ret);
goto out_commit;
}
blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster);
for (i = 0; i < num_clusters * bpc; i++, blkno++) {
ret = ocfs2_read_block(inode, blkno, &bh);
if (ret) {
mlog_errno(ret);
goto out_commit;
}
ret = ocfs2_journal_access(handle,
inode,
bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (ret < 0) {
mlog_errno(ret);
goto out_commit;
}
cp_len = value_len > blocksize ? blocksize : value_len;
memcpy(bh->b_data, value, cp_len);
value_len -= cp_len;
value += cp_len;
if (cp_len < blocksize)
memset(bh->b_data + cp_len, 0,
blocksize - cp_len);
ret = ocfs2_journal_dirty(handle, bh);
if (ret < 0) {
mlog_errno(ret);
goto out_commit;
}
brelse(bh);
bh = NULL;
/*
* XXX: do we need to empty all the following
* blocks in this cluster?
*/
if (!value_len)
break;
}
cpos += num_clusters;
}
out_commit:
ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
out:
brelse(bh);
return ret;
}
static int ocfs2_xattr_cleanup(struct inode *inode,
struct ocfs2_xattr_info *xi,
struct ocfs2_xattr_search *xs,
size_t offs)
{
handle_t *handle = NULL;
int ret = 0;
size_t name_len = strlen(xi->name);
void *val = xs->base + offs;
size_t size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)),
OCFS2_XATTR_BLOCK_UPDATE_CREDITS);
if (IS_ERR(handle)) {
ret = PTR_ERR(handle);
mlog_errno(ret);
goto out;
}
ret = ocfs2_journal_access(handle, inode, xs->xattr_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (ret) {
mlog_errno(ret);
goto out_commit;
}
/* Decrease xattr count */
le16_add_cpu(&xs->header->xh_count, -1);
/* Remove the xattr entry and tree root which has already be set*/
memset((void *)xs->here, 0, sizeof(struct ocfs2_xattr_entry));
memset(val, 0, size);
ret = ocfs2_journal_dirty(handle, xs->xattr_bh);
if (ret < 0)
mlog_errno(ret);
out_commit:
ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
out:
return ret;
}
static int ocfs2_xattr_update_entry(struct inode *inode,
struct ocfs2_xattr_info *xi,
struct ocfs2_xattr_search *xs,
size_t offs)
{
handle_t *handle = NULL;
int ret = 0;
handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)),
OCFS2_XATTR_BLOCK_UPDATE_CREDITS);
if (IS_ERR(handle)) {
ret = PTR_ERR(handle);
mlog_errno(ret);
goto out;
}
ret = ocfs2_journal_access(handle, inode, xs->xattr_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (ret) {
mlog_errno(ret);
goto out_commit;
}
xs->here->xe_name_offset = cpu_to_le16(offs);
xs->here->xe_value_size = cpu_to_le64(xi->value_len);
if (xi->value_len <= OCFS2_XATTR_INLINE_SIZE)
ocfs2_xattr_set_local(xs->here, 1);
else
ocfs2_xattr_set_local(xs->here, 0);
ocfs2_xattr_hash_entry(inode, xs->header, xs->here);
ret = ocfs2_journal_dirty(handle, xs->xattr_bh);
if (ret < 0)
mlog_errno(ret);
out_commit:
ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
out:
return ret;
}
/*
* ocfs2_xattr_set_value_outside()
*
* Set large size value in B tree.
*/
static int ocfs2_xattr_set_value_outside(struct inode *inode,
struct ocfs2_xattr_info *xi,
struct ocfs2_xattr_search *xs,
size_t offs)
{
size_t name_len = strlen(xi->name);
void *val = xs->base + offs;
struct ocfs2_xattr_value_root *xv = NULL;
size_t size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
int ret = 0;
memset(val, 0, size);
memcpy(val, xi->name, name_len);
xv = (struct ocfs2_xattr_value_root *)
(val + OCFS2_XATTR_SIZE(name_len));
xv->xr_clusters = 0;
xv->xr_last_eb_blk = 0;
xv->xr_list.l_tree_depth = 0;
xv->xr_list.l_count = cpu_to_le16(1);
xv->xr_list.l_next_free_rec = 0;
ret = ocfs2_xattr_value_truncate(inode, xs->xattr_bh, xv,
xi->value_len);
if (ret < 0) {
mlog_errno(ret);
return ret;
}
ret = __ocfs2_xattr_set_value_outside(inode, xv, xi->value,
xi->value_len);
if (ret < 0) {
mlog_errno(ret);
return ret;
}
ret = ocfs2_xattr_update_entry(inode, xi, xs, offs);
if (ret < 0)
mlog_errno(ret);
return ret;
}
/*
* ocfs2_xattr_set_entry_local()
*
* Set, replace or remove extended attribute in local.
*/
static void ocfs2_xattr_set_entry_local(struct inode *inode,
struct ocfs2_xattr_info *xi,
struct ocfs2_xattr_search *xs,
struct ocfs2_xattr_entry *last,
size_t min_offs)
{
size_t name_len = strlen(xi->name);
int i;
if (xi->value && xs->not_found) {
/* Insert the new xattr entry. */
le16_add_cpu(&xs->header->xh_count, 1);
ocfs2_xattr_set_type(last, xi->name_index);
ocfs2_xattr_set_local(last, 1);
last->xe_name_len = name_len;
} else {
void *first_val;
void *val;
size_t offs, size;
first_val = xs->base + min_offs;
offs = le16_to_cpu(xs->here->xe_name_offset);
val = xs->base + offs;
if (le64_to_cpu(xs->here->xe_value_size) >
OCFS2_XATTR_INLINE_SIZE)
size = OCFS2_XATTR_SIZE(name_len) +
OCFS2_XATTR_ROOT_SIZE;
else
size = OCFS2_XATTR_SIZE(name_len) +
OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size));
if (xi->value && size == OCFS2_XATTR_SIZE(name_len) +
OCFS2_XATTR_SIZE(xi->value_len)) {
/* The old and the new value have the
same size. Just replace the value. */
ocfs2_xattr_set_local(xs->here, 1);
xs->here->xe_value_size = cpu_to_le64(xi->value_len);
/* Clear value bytes. */
memset(val + OCFS2_XATTR_SIZE(name_len),
0,
OCFS2_XATTR_SIZE(xi->value_len));
memcpy(val + OCFS2_XATTR_SIZE(name_len),
xi->value,
xi->value_len);
return;
}
/* Remove the old name+value. */
memmove(first_val + size, first_val, val - first_val);
memset(first_val, 0, size);
xs->here->xe_name_hash = 0;
xs->here->xe_name_offset = 0;
ocfs2_xattr_set_local(xs->here, 1);
xs->here->xe_value_size = 0;
min_offs += size;
/* Adjust all value offsets. */
last = xs->header->xh_entries;
for (i = 0 ; i < le16_to_cpu(xs->header->xh_count); i++) {
size_t o = le16_to_cpu(last->xe_name_offset);
if (o < offs)
last->xe_name_offset = cpu_to_le16(o + size);
last += 1;
}
if (!xi->value) {
/* Remove the old entry. */
last -= 1;
memmove(xs->here, xs->here + 1,
(void *)last - (void *)xs->here);
memset(last, 0, sizeof(struct ocfs2_xattr_entry));
le16_add_cpu(&xs->header->xh_count, -1);
}
}
if (xi->value) {
/* Insert the new name+value. */
size_t size = OCFS2_XATTR_SIZE(name_len) +
OCFS2_XATTR_SIZE(xi->value_len);
void *val = xs->base + min_offs - size;
xs->here->xe_name_offset = cpu_to_le16(min_offs - size);
memset(val, 0, size);
memcpy(val, xi->name, name_len);
memcpy(val + OCFS2_XATTR_SIZE(name_len),
xi->value,
xi->value_len);
xs->here->xe_value_size = cpu_to_le64(xi->value_len);
ocfs2_xattr_set_local(xs->here, 1);
ocfs2_xattr_hash_entry(inode, xs->header, xs->here);
}
return;
}
/*
* ocfs2_xattr_set_entry()
*
* Set extended attribute entry into inode or block.
*
* If extended attribute value size > OCFS2_XATTR_INLINE_SIZE,
* We first insert tree root(ocfs2_xattr_value_root) with set_entry_local(),
* then set value in B tree with set_value_outside().
*/
static int ocfs2_xattr_set_entry(struct inode *inode,
struct ocfs2_xattr_info *xi,
struct ocfs2_xattr_search *xs,
int flag)
{
struct ocfs2_xattr_entry *last;
struct ocfs2_inode_info *oi = OCFS2_I(inode);
struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
size_t min_offs = xs->end - xs->base, name_len = strlen(xi->name);
size_t size_l = 0;
handle_t *handle = NULL;
int free, i, ret;
struct ocfs2_xattr_info xi_l = {
.name_index = xi->name_index,
.name = xi->name,
.value = xi->value,
.value_len = xi->value_len,
};
/* Compute min_offs, last and free space. */
last = xs->header->xh_entries;
for (i = 0 ; i < le16_to_cpu(xs->header->xh_count); i++) {
size_t offs = le16_to_cpu(last->xe_name_offset);
if (offs < min_offs)
min_offs = offs;
last += 1;
}
free = min_offs - ((void *)last - xs->base) - sizeof(__u32);
if (free < 0)
return -EFAULT;
if (!xs->not_found) {
size_t size = 0;
if (ocfs2_xattr_is_local(xs->here))
size = OCFS2_XATTR_SIZE(name_len) +
OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size));
else
size = OCFS2_XATTR_SIZE(name_len) +
OCFS2_XATTR_ROOT_SIZE;
free += (size + sizeof(struct ocfs2_xattr_entry));
}
/* Check free space in inode or block */
if (xi->value && xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
if (free < sizeof(struct ocfs2_xattr_entry) +
OCFS2_XATTR_SIZE(name_len) +
OCFS2_XATTR_ROOT_SIZE) {
ret = -ENOSPC;
goto out;
}
size_l = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
xi_l.value = (void *)&def_xv;
xi_l.value_len = OCFS2_XATTR_ROOT_SIZE;
} else if (xi->value) {
if (free < sizeof(struct ocfs2_xattr_entry) +
OCFS2_XATTR_SIZE(name_len) +
OCFS2_XATTR_SIZE(xi->value_len)) {
ret = -ENOSPC;
goto out;
}
}
if (!xs->not_found) {
/* For existing extended attribute */
size_t size = OCFS2_XATTR_SIZE(name_len) +
OCFS2_XATTR_SIZE(le64_to_cpu(xs->here->xe_value_size));
size_t offs = le16_to_cpu(xs->here->xe_name_offset);
void *val = xs->base + offs;
if (ocfs2_xattr_is_local(xs->here) && size == size_l) {
/* Replace existing local xattr with tree root */
ret = ocfs2_xattr_set_value_outside(inode, xi, xs,
offs);
if (ret < 0)
mlog_errno(ret);
goto out;
} else if (!ocfs2_xattr_is_local(xs->here)) {
/* For existing xattr which has value outside */
struct ocfs2_xattr_value_root *xv = NULL;
xv = (struct ocfs2_xattr_value_root *)(val +
OCFS2_XATTR_SIZE(name_len));
if (xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
/*
* If new value need set outside also,
* first truncate old value to new value,
* then set new value with set_value_outside().
*/
ret = ocfs2_xattr_value_truncate(inode,
xs->xattr_bh,
xv,
xi->value_len);
if (ret < 0) {
mlog_errno(ret);
goto out;
}
ret = __ocfs2_xattr_set_value_outside(inode,
xv,
xi->value,
xi->value_len);
if (ret < 0) {
mlog_errno(ret);
goto out;
}
ret = ocfs2_xattr_update_entry(inode,
xi,
xs,
offs);
if (ret < 0)
mlog_errno(ret);
goto out;
} else {
/*
* If new value need set in local,
* just trucate old value to zero.
*/
ret = ocfs2_xattr_value_truncate(inode,
xs->xattr_bh,
xv,
0);
if (ret < 0)
mlog_errno(ret);
}
}
}
handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)),
OCFS2_INODE_UPDATE_CREDITS);
if (IS_ERR(handle)) {
ret = PTR_ERR(handle);
mlog_errno(ret);
goto out;
}
ret = ocfs2_journal_access(handle, inode, xs->inode_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (ret) {
mlog_errno(ret);
goto out_commit;
}
if (!(flag & OCFS2_INLINE_XATTR_FL)) {
/* set extended attribute in external block. */
ret = ocfs2_extend_trans(handle,
OCFS2_INODE_UPDATE_CREDITS +
OCFS2_XATTR_BLOCK_UPDATE_CREDITS);
if (ret) {
mlog_errno(ret);
goto out_commit;
}
ret = ocfs2_journal_access(handle, inode, xs->xattr_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (ret) {
mlog_errno(ret);
goto out_commit;
}
}
/*
* Set value in local, include set tree root in local.
* This is the first step for value size >INLINE_SIZE.
*/
ocfs2_xattr_set_entry_local(inode, &xi_l, xs, last, min_offs);
if (!(flag & OCFS2_INLINE_XATTR_FL)) {
ret = ocfs2_journal_dirty(handle, xs->xattr_bh);
if (ret < 0) {
mlog_errno(ret);
goto out_commit;
}
}
if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) &&
(flag & OCFS2_INLINE_XATTR_FL)) {
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
unsigned int xattrsize = osb->s_xattr_inline_size;
/*
* Adjust extent record count or inline data size
* to reserve space for extended attribute.
*/
if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
struct ocfs2_inline_data *idata = &di->id2.i_data;
le16_add_cpu(&idata->id_count, -xattrsize);
} else if (!(ocfs2_inode_is_fast_symlink(inode))) {
struct ocfs2_extent_list *el = &di->id2.i_list;
le16_add_cpu(&el->l_count, -(xattrsize /
sizeof(struct ocfs2_extent_rec)));
}
di->i_xattr_inline_size = cpu_to_le16(xattrsize);
}
/* Update xattr flag */
spin_lock(&oi->ip_lock);
oi->ip_dyn_features |= flag;
di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
spin_unlock(&oi->ip_lock);
/* Update inode ctime */
inode->i_ctime = CURRENT_TIME;
di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
ret = ocfs2_journal_dirty(handle, xs->inode_bh);
if (ret < 0)
mlog_errno(ret);
out_commit:
ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
if (!ret && xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
/*
* Set value outside in B tree.
* This is the second step for value size > INLINE_SIZE.
*/
size_t offs = le16_to_cpu(xs->here->xe_name_offset);
ret = ocfs2_xattr_set_value_outside(inode, xi, xs, offs);
if (ret < 0) {
int ret2;
mlog_errno(ret);
/*
* If set value outside failed, we have to clean
* the junk tree root we have already set in local.
*/
ret2 = ocfs2_xattr_cleanup(inode, xi, xs, offs);
if (ret2 < 0)
mlog_errno(ret2);
}
}
out:
return ret;
}
static int ocfs2_remove_value_outside(struct inode*inode,
struct buffer_head *bh,
struct ocfs2_xattr_header *header)
{
int ret = 0, i;
for (i = 0; i < le16_to_cpu(header->xh_count); i++) {
struct ocfs2_xattr_entry *entry = &header->xh_entries[i];
if (!ocfs2_xattr_is_local(entry)) {
struct ocfs2_xattr_value_root *xv;
void *val;
val = (void *)header +
le16_to_cpu(entry->xe_name_offset);
xv = (struct ocfs2_xattr_value_root *)
(val + OCFS2_XATTR_SIZE(entry->xe_name_len));
ret = ocfs2_xattr_value_truncate(inode, bh, xv, 0);
if (ret < 0) {
mlog_errno(ret);
return ret;
}
}
}
return ret;
}
static int ocfs2_xattr_ibody_remove(struct inode *inode,
struct buffer_head *di_bh)
{
struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
struct ocfs2_xattr_header *header;
int ret;
header = (struct ocfs2_xattr_header *)
((void *)di + inode->i_sb->s_blocksize -
le16_to_cpu(di->i_xattr_inline_size));
ret = ocfs2_remove_value_outside(inode, di_bh, header);
return ret;
}
static int ocfs2_xattr_block_remove(struct inode *inode,
struct buffer_head *blk_bh)
{
struct ocfs2_xattr_block *xb;
int ret = 0;
xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
struct ocfs2_xattr_header *header = &(xb->xb_attrs.xb_header);
ret = ocfs2_remove_value_outside(inode, blk_bh, header);
} else
ret = ocfs2_delete_xattr_index_block(inode, blk_bh);
return ret;
}
static int ocfs2_xattr_free_block(struct inode *inode,
u64 block)
{
struct inode *xb_alloc_inode;
struct buffer_head *xb_alloc_bh = NULL;
struct buffer_head *blk_bh = NULL;
struct ocfs2_xattr_block *xb;
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
handle_t *handle;
int ret = 0;
u64 blk, bg_blkno;
u16 bit;
ret = ocfs2_read_block(inode, block, &blk_bh);
if (ret < 0) {
mlog_errno(ret);
goto out;
}
/*Verify the signature of xattr block*/
if (memcmp((void *)blk_bh->b_data, OCFS2_XATTR_BLOCK_SIGNATURE,
strlen(OCFS2_XATTR_BLOCK_SIGNATURE))) {
ret = -EFAULT;
goto out;
}
ret = ocfs2_xattr_block_remove(inode, blk_bh);
if (ret < 0) {
mlog_errno(ret);
goto out;
}
xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
blk = le64_to_cpu(xb->xb_blkno);
bit = le16_to_cpu(xb->xb_suballoc_bit);
bg_blkno = ocfs2_which_suballoc_group(blk, bit);
xb_alloc_inode = ocfs2_get_system_file_inode(osb,
EXTENT_ALLOC_SYSTEM_INODE,
le16_to_cpu(xb->xb_suballoc_slot));
if (!xb_alloc_inode) {
ret = -ENOMEM;
mlog_errno(ret);
goto out;
}
mutex_lock(&xb_alloc_inode->i_mutex);
ret = ocfs2_inode_lock(xb_alloc_inode, &xb_alloc_bh, 1);
if (ret < 0) {
mlog_errno(ret);
goto out_mutex;
}
handle = ocfs2_start_trans(osb, OCFS2_SUBALLOC_FREE);
if (IS_ERR(handle)) {
ret = PTR_ERR(handle);
mlog_errno(ret);
goto out_unlock;
}
ret = ocfs2_free_suballoc_bits(handle, xb_alloc_inode, xb_alloc_bh,
bit, bg_blkno, 1);
if (ret < 0)
mlog_errno(ret);
ocfs2_commit_trans(osb, handle);
out_unlock:
ocfs2_inode_unlock(xb_alloc_inode, 1);
brelse(xb_alloc_bh);
out_mutex:
mutex_unlock(&xb_alloc_inode->i_mutex);
iput(xb_alloc_inode);
out:
brelse(blk_bh);
return ret;
}
/*
* ocfs2_xattr_remove()
*
* Free extended attribute resources associated with this inode.
*/
int ocfs2_xattr_remove(struct inode *inode, struct buffer_head *di_bh)
{
struct ocfs2_inode_info *oi = OCFS2_I(inode);
struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
handle_t *handle;
int ret;
if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
return 0;
if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
return 0;
if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
ret = ocfs2_xattr_ibody_remove(inode, di_bh);
if (ret < 0) {
mlog_errno(ret);
goto out;
}
}
if (di->i_xattr_loc) {
ret = ocfs2_xattr_free_block(inode,
le64_to_cpu(di->i_xattr_loc));
if (ret < 0) {
mlog_errno(ret);
goto out;
}
}
handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)),
OCFS2_INODE_UPDATE_CREDITS);
if (IS_ERR(handle)) {
ret = PTR_ERR(handle);
mlog_errno(ret);
goto out;
}
ret = ocfs2_journal_access(handle, inode, di_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (ret) {
mlog_errno(ret);
goto out_commit;
}
di->i_xattr_loc = 0;
spin_lock(&oi->ip_lock);
oi->ip_dyn_features &= ~(OCFS2_INLINE_XATTR_FL | OCFS2_HAS_XATTR_FL);
di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
spin_unlock(&oi->ip_lock);
ret = ocfs2_journal_dirty(handle, di_bh);
if (ret < 0)
mlog_errno(ret);
out_commit:
ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
out:
return ret;
}
static int ocfs2_xattr_has_space_inline(struct inode *inode,
struct ocfs2_dinode *di)
{
struct ocfs2_inode_info *oi = OCFS2_I(inode);
unsigned int xattrsize = OCFS2_SB(inode->i_sb)->s_xattr_inline_size;
int free;
if (xattrsize < OCFS2_MIN_XATTR_INLINE_SIZE)
return 0;
if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
struct ocfs2_inline_data *idata = &di->id2.i_data;
free = le16_to_cpu(idata->id_count) - le64_to_cpu(di->i_size);
} else if (ocfs2_inode_is_fast_symlink(inode)) {
free = ocfs2_fast_symlink_chars(inode->i_sb) -
le64_to_cpu(di->i_size);
} else {
struct ocfs2_extent_list *el = &di->id2.i_list;
free = (le16_to_cpu(el->l_count) -
le16_to_cpu(el->l_next_free_rec)) *
sizeof(struct ocfs2_extent_rec);
}
if (free >= xattrsize)
return 1;
return 0;
}
/*
* ocfs2_xattr_ibody_find()
*
* Find extended attribute in inode block and
* fill search info into struct ocfs2_xattr_search.
*/
static int ocfs2_xattr_ibody_find(struct inode *inode,
int name_index,
const char *name,
struct ocfs2_xattr_search *xs)
{
struct ocfs2_inode_info *oi = OCFS2_I(inode);
struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
int ret;
int has_space = 0;
if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE)
return 0;
if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) {
down_read(&oi->ip_alloc_sem);
has_space = ocfs2_xattr_has_space_inline(inode, di);
up_read(&oi->ip_alloc_sem);
if (!has_space)
return 0;
}
xs->xattr_bh = xs->inode_bh;
xs->end = (void *)di + inode->i_sb->s_blocksize;
if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)
xs->header = (struct ocfs2_xattr_header *)
(xs->end - le16_to_cpu(di->i_xattr_inline_size));
else
xs->header = (struct ocfs2_xattr_header *)
(xs->end - OCFS2_SB(inode->i_sb)->s_xattr_inline_size);
xs->base = (void *)xs->header;
xs->here = xs->header->xh_entries;
/* Find the named attribute. */
if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
ret = ocfs2_xattr_find_entry(name_index, name, xs);
if (ret && ret != -ENODATA)
return ret;
xs->not_found = ret;
}
return 0;
}
/*
* ocfs2_xattr_ibody_set()
*
* Set, replace or remove an extended attribute into inode block.
*
*/
static int ocfs2_xattr_ibody_set(struct inode *inode,
struct ocfs2_xattr_info *xi,
struct ocfs2_xattr_search *xs)
{
struct ocfs2_inode_info *oi = OCFS2_I(inode);
struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
int ret;
if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE)
return -ENOSPC;
down_write(&oi->ip_alloc_sem);
if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) {
if (!ocfs2_xattr_has_space_inline(inode, di)) {
ret = -ENOSPC;
goto out;
}
}
ret = ocfs2_xattr_set_entry(inode, xi, xs,
(OCFS2_INLINE_XATTR_FL | OCFS2_HAS_XATTR_FL));
out:
up_write(&oi->ip_alloc_sem);
return ret;
}
/*
* ocfs2_xattr_block_find()
*
* Find extended attribute in external block and
* fill search info into struct ocfs2_xattr_search.
*/
static int ocfs2_xattr_block_find(struct inode *inode,
int name_index,
const char *name,
struct ocfs2_xattr_search *xs)
{
struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
struct buffer_head *blk_bh = NULL;
struct ocfs2_xattr_block *xb;
int ret = 0;
if (!di->i_xattr_loc)
return ret;
ret = ocfs2_read_block(inode, le64_to_cpu(di->i_xattr_loc), &blk_bh);
if (ret < 0) {
mlog_errno(ret);
return ret;
}
/*Verify the signature of xattr block*/
if (memcmp((void *)blk_bh->b_data, OCFS2_XATTR_BLOCK_SIGNATURE,
strlen(OCFS2_XATTR_BLOCK_SIGNATURE))) {
ret = -EFAULT;
goto cleanup;
}
xs->xattr_bh = blk_bh;
xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
xs->header = &xb->xb_attrs.xb_header;
xs->base = (void *)xs->header;
xs->end = (void *)(blk_bh->b_data) + blk_bh->b_size;
xs->here = xs->header->xh_entries;
ret = ocfs2_xattr_find_entry(name_index, name, xs);
} else
ret = ocfs2_xattr_index_block_find(inode, blk_bh,
name_index,
name, xs);
if (ret && ret != -ENODATA) {
xs->xattr_bh = NULL;
goto cleanup;
}
xs->not_found = ret;
return 0;
cleanup:
brelse(blk_bh);
return ret;
}
/*
* When all the xattrs are deleted from index btree, the ocfs2_xattr_tree
* will be erased and ocfs2_xattr_block will have its ocfs2_xattr_header
* re-initialized.
*/
static int ocfs2_restore_xattr_block(struct inode *inode,
struct ocfs2_xattr_search *xs)
{
int ret;
handle_t *handle;
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
struct ocfs2_xattr_block *xb =
(struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
struct ocfs2_extent_list *el = &xb->xb_attrs.xb_root.xt_list;
u16 xb_flags = le16_to_cpu(xb->xb_flags);
BUG_ON(!(xb_flags & OCFS2_XATTR_INDEXED) ||
le16_to_cpu(el->l_next_free_rec) != 0);
handle = ocfs2_start_trans(osb, OCFS2_XATTR_BLOCK_UPDATE_CREDITS);
if (IS_ERR(handle)) {
ret = PTR_ERR(handle);
handle = NULL;
goto out;
}
ret = ocfs2_journal_access(handle, inode, xs->xattr_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (ret < 0) {
mlog_errno(ret);
goto out_commit;
}
memset(&xb->xb_attrs, 0, inode->i_sb->s_blocksize -
offsetof(struct ocfs2_xattr_block, xb_attrs));
xb->xb_flags = cpu_to_le16(xb_flags & ~OCFS2_XATTR_INDEXED);
ocfs2_journal_dirty(handle, xs->xattr_bh);
out_commit:
ocfs2_commit_trans(osb, handle);
out:
return ret;
}
/*
* ocfs2_xattr_block_set()
*
* Set, replace or remove an extended attribute into external block.
*
*/
static int ocfs2_xattr_block_set(struct inode *inode,
struct ocfs2_xattr_info *xi,
struct ocfs2_xattr_search *xs)
{
struct buffer_head *new_bh = NULL;
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
struct ocfs2_alloc_context *meta_ac = NULL;
handle_t *handle = NULL;
struct ocfs2_xattr_block *xblk = NULL;
u16 suballoc_bit_start;
u32 num_got;
u64 first_blkno;
int ret;
if (!xs->xattr_bh) {
/*
* Alloc one external block for extended attribute
* outside of inode.
*/
ret = ocfs2_reserve_new_metadata_blocks(osb, 1, &meta_ac);
if (ret < 0) {
mlog_errno(ret);
goto out;
}
handle = ocfs2_start_trans(osb,
OCFS2_XATTR_BLOCK_CREATE_CREDITS);
if (IS_ERR(handle)) {
ret = PTR_ERR(handle);
mlog_errno(ret);
goto out;
}
ret = ocfs2_journal_access(handle, inode, xs->inode_bh,
OCFS2_JOURNAL_ACCESS_CREATE);
if (ret < 0) {
mlog_errno(ret);
goto out_commit;
}
ret = ocfs2_claim_metadata(osb, handle, meta_ac, 1,
&suballoc_bit_start, &num_got,
&first_blkno);
if (ret < 0) {
mlog_errno(ret);
goto out_commit;
}
new_bh = sb_getblk(inode->i_sb, first_blkno);
ocfs2_set_new_buffer_uptodate(inode, new_bh);
ret = ocfs2_journal_access(handle, inode, new_bh,
OCFS2_JOURNAL_ACCESS_CREATE);
if (ret < 0) {
mlog_errno(ret);
goto out_commit;
}
/* Initialize ocfs2_xattr_block */
xs->xattr_bh = new_bh;
xblk = (struct ocfs2_xattr_block *)new_bh->b_data;
memset(xblk, 0, inode->i_sb->s_blocksize);
strcpy((void *)xblk, OCFS2_XATTR_BLOCK_SIGNATURE);
xblk->xb_suballoc_slot = cpu_to_le16(osb->slot_num);
xblk->xb_suballoc_bit = cpu_to_le16(suballoc_bit_start);
xblk->xb_fs_generation = cpu_to_le32(osb->fs_generation);
xblk->xb_blkno = cpu_to_le64(first_blkno);
xs->header = &xblk->xb_attrs.xb_header;
xs->base = (void *)xs->header;
xs->end = (void *)xblk + inode->i_sb->s_blocksize;
xs->here = xs->header->xh_entries;
ret = ocfs2_journal_dirty(handle, new_bh);
if (ret < 0) {
mlog_errno(ret);
goto out_commit;
}
di->i_xattr_loc = cpu_to_le64(first_blkno);
ret = ocfs2_journal_dirty(handle, xs->inode_bh);
if (ret < 0)
mlog_errno(ret);
out_commit:
ocfs2_commit_trans(osb, handle);
out:
if (meta_ac)
ocfs2_free_alloc_context(meta_ac);
if (ret < 0)
return ret;
} else
xblk = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
if (!(le16_to_cpu(xblk->xb_flags) & OCFS2_XATTR_INDEXED)) {
/* Set extended attribute into external block */
ret = ocfs2_xattr_set_entry(inode, xi, xs, OCFS2_HAS_XATTR_FL);
if (!ret || ret != -ENOSPC)
goto end;
ret = ocfs2_xattr_create_index_block(inode, xs);
if (ret)
goto end;
}
ret = ocfs2_xattr_set_entry_index_block(inode, xi, xs);
if (!ret && xblk->xb_attrs.xb_root.xt_list.l_next_free_rec == 0)
ret = ocfs2_restore_xattr_block(inode, xs);
end:
return ret;
}
/*
* ocfs2_xattr_set()
*
* Set, replace or remove an extended attribute for this inode.
* value is NULL to remove an existing extended attribute, else either
* create or replace an extended attribute.
*/
int ocfs2_xattr_set(struct inode *inode,
int name_index,
const char *name,
const void *value,
size_t value_len,
int flags)
{
struct buffer_head *di_bh = NULL;
struct ocfs2_dinode *di;
int ret;
u16 i, blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
struct ocfs2_xattr_info xi = {
.name_index = name_index,
.name = name,
.value = value,
.value_len = value_len,
};
struct ocfs2_xattr_search xis = {
.not_found = -ENODATA,
};
struct ocfs2_xattr_search xbs = {
.not_found = -ENODATA,
};
if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
return -EOPNOTSUPP;
ret = ocfs2_inode_lock(inode, &di_bh, 1);
if (ret < 0) {
mlog_errno(ret);
return ret;
}
xis.inode_bh = xbs.inode_bh = di_bh;
di = (struct ocfs2_dinode *)di_bh->b_data;
down_write(&OCFS2_I(inode)->ip_xattr_sem);
/*
* Scan inode and external block to find the same name
* extended attribute and collect search infomation.
*/
ret = ocfs2_xattr_ibody_find(inode, name_index, name, &xis);
if (ret)
goto cleanup;
if (xis.not_found) {
ret = ocfs2_xattr_block_find(inode, name_index, name, &xbs);
if (ret)
goto cleanup;
}
if (xis.not_found && xbs.not_found) {
ret = -ENODATA;
if (flags & XATTR_REPLACE)
goto cleanup;
ret = 0;
if (!value)
goto cleanup;
} else {
ret = -EEXIST;
if (flags & XATTR_CREATE)
goto cleanup;
}
if (!value) {
/* Remove existing extended attribute */
if (!xis.not_found)
ret = ocfs2_xattr_ibody_set(inode, &xi, &xis);
else if (!xbs.not_found)
ret = ocfs2_xattr_block_set(inode, &xi, &xbs);
} else {
/* We always try to set extended attribute into inode first*/
ret = ocfs2_xattr_ibody_set(inode, &xi, &xis);
if (!ret && !xbs.not_found) {
/*
* If succeed and that extended attribute existing in
* external block, then we will remove it.
*/
xi.value = NULL;
xi.value_len = 0;
ret = ocfs2_xattr_block_set(inode, &xi, &xbs);
} else if (ret == -ENOSPC) {
if (di->i_xattr_loc && !xbs.xattr_bh) {
ret = ocfs2_xattr_block_find(inode, name_index,
name, &xbs);
if (ret)
goto cleanup;
}
/*
* If no space in inode, we will set extended attribute
* into external block.
*/
ret = ocfs2_xattr_block_set(inode, &xi, &xbs);
if (ret)
goto cleanup;
if (!xis.not_found) {
/*
* If succeed and that extended attribute
* existing in inode, we will remove it.
*/
xi.value = NULL;
xi.value_len = 0;
ret = ocfs2_xattr_ibody_set(inode, &xi, &xis);
}
}
}
cleanup:
up_write(&OCFS2_I(inode)->ip_xattr_sem);
ocfs2_inode_unlock(inode, 1);
brelse(di_bh);
brelse(xbs.xattr_bh);
for (i = 0; i < blk_per_bucket; i++)
brelse(xbs.bucket.bhs[i]);
return ret;
}
/*
* Find the xattr extent rec which may contains name_hash.
* e_cpos will be the first name hash of the xattr rec.
* el must be the ocfs2_xattr_header.xb_attrs.xb_root.xt_list.
*/
static int ocfs2_xattr_get_rec(struct inode *inode,
u32 name_hash,
u64 *p_blkno,
u32 *e_cpos,
u32 *num_clusters,
struct ocfs2_extent_list *el)
{
int ret = 0, i;
struct buffer_head *eb_bh = NULL;
struct ocfs2_extent_block *eb;
struct ocfs2_extent_rec *rec = NULL;
u64 e_blkno = 0;
if (el->l_tree_depth) {
ret = ocfs2_find_leaf(inode, el, name_hash, &eb_bh);
if (ret) {
mlog_errno(ret);
goto out;
}
eb = (struct ocfs2_extent_block *) eb_bh->b_data;
el = &eb->h_list;
if (el->l_tree_depth) {
ocfs2_error(inode->i_sb,
"Inode %lu has non zero tree depth in "
"xattr tree block %llu\n", inode->i_ino,
(unsigned long long)eb_bh->b_blocknr);
ret = -EROFS;
goto out;
}
}
for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) {
rec = &el->l_recs[i];
if (le32_to_cpu(rec->e_cpos) <= name_hash) {
e_blkno = le64_to_cpu(rec->e_blkno);
break;
}
}
if (!e_blkno) {
ocfs2_error(inode->i_sb, "Inode %lu has bad extent "
"record (%u, %u, 0) in xattr", inode->i_ino,
le32_to_cpu(rec->e_cpos),
ocfs2_rec_clusters(el, rec));
ret = -EROFS;
goto out;
}
*p_blkno = le64_to_cpu(rec->e_blkno);
*num_clusters = le16_to_cpu(rec->e_leaf_clusters);
if (e_cpos)
*e_cpos = le32_to_cpu(rec->e_cpos);
out:
brelse(eb_bh);
return ret;
}
typedef int (xattr_bucket_func)(struct inode *inode,
struct ocfs2_xattr_bucket *bucket,
void *para);
static int ocfs2_find_xe_in_bucket(struct inode *inode,
struct buffer_head *header_bh,
int name_index,
const char *name,
u32 name_hash,
u16 *xe_index,
int *found)
{
int i, ret = 0, cmp = 1, block_off, new_offset;
struct ocfs2_xattr_header *xh =
(struct ocfs2_xattr_header *)header_bh->b_data;
size_t name_len = strlen(name);
struct ocfs2_xattr_entry *xe = NULL;
struct buffer_head *name_bh = NULL;
char *xe_name;
/*
* We don't use binary search in the bucket because there
* may be multiple entries with the same name hash.
*/
for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
xe = &xh->xh_entries[i];
if (name_hash > le32_to_cpu(xe->xe_name_hash))
continue;
else if (name_hash < le32_to_cpu(xe->xe_name_hash))
break;
cmp = name_index - ocfs2_xattr_get_type(xe);
if (!cmp)
cmp = name_len - xe->xe_name_len;
if (cmp)
continue;
ret = ocfs2_xattr_bucket_get_name_value(inode,
xh,
i,
&block_off,
&new_offset);
if (ret) {
mlog_errno(ret);
break;
}
ret = ocfs2_read_block(inode, header_bh->b_blocknr + block_off,
&name_bh);
if (ret) {
mlog_errno(ret);
break;
}
xe_name = name_bh->b_data + new_offset;
cmp = memcmp(name, xe_name, name_len);
brelse(name_bh);
name_bh = NULL;
if (cmp == 0) {
*xe_index = i;
*found = 1;
ret = 0;
break;
}
}
return ret;
}
/*
* Find the specified xattr entry in a series of buckets.
* This series start from p_blkno and last for num_clusters.
* The ocfs2_xattr_header.xh_num_buckets of the first bucket contains
* the num of the valid buckets.
*
* Return the buffer_head this xattr should reside in. And if the xattr's
* hash is in the gap of 2 buckets, return the lower bucket.
*/
static int ocfs2_xattr_bucket_find(struct inode *inode,
int name_index,
const char *name,
u32 name_hash,
u64 p_blkno,
u32 first_hash,
u32 num_clusters,
struct ocfs2_xattr_search *xs)
{
int ret, found = 0;
struct buffer_head *bh = NULL;
struct buffer_head *lower_bh = NULL;
struct ocfs2_xattr_header *xh = NULL;
struct ocfs2_xattr_entry *xe = NULL;
u16 index = 0;
u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
int low_bucket = 0, bucket, high_bucket;
u32 last_hash;
u64 blkno;
ret = ocfs2_read_block(inode, p_blkno, &bh);
if (ret) {
mlog_errno(ret);
goto out;
}
xh = (struct ocfs2_xattr_header *)bh->b_data;
high_bucket = le16_to_cpu(xh->xh_num_buckets) - 1;
while (low_bucket <= high_bucket) {
brelse(bh);
bh = NULL;
bucket = (low_bucket + high_bucket) / 2;
blkno = p_blkno + bucket * blk_per_bucket;
ret = ocfs2_read_block(inode, blkno, &bh);
if (ret) {
mlog_errno(ret);
goto out;
}
xh = (struct ocfs2_xattr_header *)bh->b_data;
xe = &xh->xh_entries[0];
if (name_hash < le32_to_cpu(xe->xe_name_hash)) {
high_bucket = bucket - 1;
continue;
}
/*
* Check whether the hash of the last entry in our
* bucket is larger than the search one. for an empty
* bucket, the last one is also the first one.
*/
if (xh->xh_count)
xe = &xh->xh_entries[le16_to_cpu(xh->xh_count) - 1];
last_hash = le32_to_cpu(xe->xe_name_hash);
/* record lower_bh which may be the insert place. */
brelse(lower_bh);
lower_bh = bh;
bh = NULL;
if (name_hash > le32_to_cpu(xe->xe_name_hash)) {
low_bucket = bucket + 1;
continue;
}
/* the searched xattr should reside in this bucket if exists. */
ret = ocfs2_find_xe_in_bucket(inode, lower_bh,
name_index, name, name_hash,
&index, &found);
if (ret) {
mlog_errno(ret);
goto out;
}
break;
}
/*
* Record the bucket we have found.
* When the xattr's hash value is in the gap of 2 buckets, we will
* always set it to the previous bucket.
*/
if (!lower_bh) {
/*
* We can't find any bucket whose first name_hash is less
* than the find name_hash.
*/
BUG_ON(bh->b_blocknr != p_blkno);
lower_bh = bh;
bh = NULL;
}
xs->bucket.bhs[0] = lower_bh;
xs->bucket.xh = (struct ocfs2_xattr_header *)
xs->bucket.bhs[0]->b_data;
lower_bh = NULL;
xs->header = xs->bucket.xh;
xs->base = xs->bucket.bhs[0]->b_data;
xs->end = xs->base + inode->i_sb->s_blocksize;
if (found) {
/*
* If we have found the xattr enty, read all the blocks in
* this bucket.
*/
ret = ocfs2_read_blocks(inode, xs->bucket.bhs[0]->b_blocknr + 1,
blk_per_bucket - 1, &xs->bucket.bhs[1],
0);
if (ret) {
mlog_errno(ret);
goto out;
}
xs->here = &xs->header->xh_entries[index];
mlog(0, "find xattr %s in bucket %llu, entry = %u\n", name,
(unsigned long long)xs->bucket.bhs[0]->b_blocknr, index);
} else
ret = -ENODATA;
out:
brelse(bh);
brelse(lower_bh);
return ret;
}
static int ocfs2_xattr_index_block_find(struct inode *inode,
struct buffer_head *root_bh,
int name_index,
const char *name,
struct ocfs2_xattr_search *xs)
{
int ret;
struct ocfs2_xattr_block *xb =
(struct ocfs2_xattr_block *)root_bh->b_data;
struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root;
struct ocfs2_extent_list *el = &xb_root->xt_list;
u64 p_blkno = 0;
u32 first_hash, num_clusters = 0;
u32 name_hash = ocfs2_xattr_name_hash(inode, name, strlen(name));
if (le16_to_cpu(el->l_next_free_rec) == 0)
return -ENODATA;
mlog(0, "find xattr %s, hash = %u, index = %d in xattr tree\n",
name, name_hash, name_index);
ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &first_hash,
&num_clusters, el);
if (ret) {
mlog_errno(ret);
goto out;
}
BUG_ON(p_blkno == 0 || num_clusters == 0 || first_hash > name_hash);
mlog(0, "find xattr extent rec %u clusters from %llu, the first hash "
"in the rec is %u\n", num_clusters, p_blkno, first_hash);
ret = ocfs2_xattr_bucket_find(inode, name_index, name, name_hash,
p_blkno, first_hash, num_clusters, xs);
out:
return ret;
}
static int ocfs2_iterate_xattr_buckets(struct inode *inode,
u64 blkno,
u32 clusters,
xattr_bucket_func *func,
void *para)
{
int i, j, ret = 0;
int blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
u32 bpc = ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb));
u32 num_buckets = clusters * bpc;
struct ocfs2_xattr_bucket bucket;
memset(&bucket, 0, sizeof(bucket));
mlog(0, "iterating xattr buckets in %u clusters starting from %llu\n",
clusters, blkno);
for (i = 0; i < num_buckets; i++, blkno += blk_per_bucket) {
ret = ocfs2_read_blocks(inode, blkno, blk_per_bucket,
bucket.bhs, 0);
if (ret) {
mlog_errno(ret);
goto out;
}
bucket.xh = (struct ocfs2_xattr_header *)bucket.bhs[0]->b_data;
/*
* The real bucket num in this series of blocks is stored
* in the 1st bucket.
*/
if (i == 0)
num_buckets = le16_to_cpu(bucket.xh->xh_num_buckets);
mlog(0, "iterating xattr bucket %llu, first hash %u\n", blkno,
le32_to_cpu(bucket.xh->xh_entries[0].xe_name_hash));
if (func) {
ret = func(inode, &bucket, para);
if (ret) {
mlog_errno(ret);
break;
}
}
for (j = 0; j < blk_per_bucket; j++)
brelse(bucket.bhs[j]);
memset(&bucket, 0, sizeof(bucket));
}
out:
for (j = 0; j < blk_per_bucket; j++)
brelse(bucket.bhs[j]);
return ret;
}
struct ocfs2_xattr_tree_list {
char *buffer;
size_t buffer_size;
size_t result;
};
static int ocfs2_xattr_bucket_get_name_value(struct inode *inode,
struct ocfs2_xattr_header *xh,
int index,
int *block_off,
int *new_offset)
{
u16 name_offset;
if (index < 0 || index >= le16_to_cpu(xh->xh_count))
return -EINVAL;
name_offset = le16_to_cpu(xh->xh_entries[index].xe_name_offset);
*block_off = name_offset >> inode->i_sb->s_blocksize_bits;
*new_offset = name_offset % inode->i_sb->s_blocksize;
return 0;
}
static int ocfs2_list_xattr_bucket(struct inode *inode,
struct ocfs2_xattr_bucket *bucket,
void *para)
{
int ret = 0, type;
struct ocfs2_xattr_tree_list *xl = (struct ocfs2_xattr_tree_list *)para;
int i, block_off, new_offset;
const char *prefix, *name;
for (i = 0 ; i < le16_to_cpu(bucket->xh->xh_count); i++) {
struct ocfs2_xattr_entry *entry = &bucket->xh->xh_entries[i];
type = ocfs2_xattr_get_type(entry);
prefix = ocfs2_xattr_prefix(type);
if (prefix) {
ret = ocfs2_xattr_bucket_get_name_value(inode,
bucket->xh,
i,
&block_off,
&new_offset);
if (ret)
break;
name = (const char *)bucket->bhs[block_off]->b_data +
new_offset;
ret = ocfs2_xattr_list_entry(xl->buffer,
xl->buffer_size,
&xl->result,
prefix, name,
entry->xe_name_len);
if (ret)
break;
}
}
return ret;
}
static int ocfs2_xattr_tree_list_index_block(struct inode *inode,
struct ocfs2_xattr_tree_root *xt,
char *buffer,
size_t buffer_size)
{
struct ocfs2_extent_list *el = &xt->xt_list;
int ret = 0;
u32 name_hash = UINT_MAX, e_cpos = 0, num_clusters = 0;
u64 p_blkno = 0;
struct ocfs2_xattr_tree_list xl = {
.buffer = buffer,
.buffer_size = buffer_size,
.result = 0,
};
if (le16_to_cpu(el->l_next_free_rec) == 0)
return 0;
while (name_hash > 0) {
ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno,
&e_cpos, &num_clusters, el);
if (ret) {
mlog_errno(ret);
goto out;
}
ret = ocfs2_iterate_xattr_buckets(inode, p_blkno, num_clusters,
ocfs2_list_xattr_bucket,
&xl);
if (ret) {
mlog_errno(ret);
goto out;
}
if (e_cpos == 0)
break;
name_hash = e_cpos - 1;
}
ret = xl.result;
out:
return ret;
}
static int cmp_xe(const void *a, const void *b)
{
const struct ocfs2_xattr_entry *l = a, *r = b;
u32 l_hash = le32_to_cpu(l->xe_name_hash);
u32 r_hash = le32_to_cpu(r->xe_name_hash);
if (l_hash > r_hash)
return 1;
if (l_hash < r_hash)
return -1;
return 0;
}
static void swap_xe(void *a, void *b, int size)
{
struct ocfs2_xattr_entry *l = a, *r = b, tmp;
tmp = *l;
memcpy(l, r, sizeof(struct ocfs2_xattr_entry));
memcpy(r, &tmp, sizeof(struct ocfs2_xattr_entry));
}
/*
* When the ocfs2_xattr_block is filled up, new bucket will be created
* and all the xattr entries will be moved to the new bucket.
* Note: we need to sort the entries since they are not saved in order
* in the ocfs2_xattr_block.
*/
static void ocfs2_cp_xattr_block_to_bucket(struct inode *inode,
struct buffer_head *xb_bh,
struct buffer_head *xh_bh,
struct buffer_head *data_bh)
{
int i, blocksize = inode->i_sb->s_blocksize;
u16 offset, size, off_change;
struct ocfs2_xattr_entry *xe;
struct ocfs2_xattr_block *xb =
(struct ocfs2_xattr_block *)xb_bh->b_data;
struct ocfs2_xattr_header *xb_xh = &xb->xb_attrs.xb_header;
struct ocfs2_xattr_header *xh =
(struct ocfs2_xattr_header *)xh_bh->b_data;
u16 count = le16_to_cpu(xb_xh->xh_count);
char *target = xh_bh->b_data, *src = xb_bh->b_data;
mlog(0, "cp xattr from block %llu to bucket %llu\n",
(unsigned long long)xb_bh->b_blocknr,
(unsigned long long)xh_bh->b_blocknr);
memset(xh_bh->b_data, 0, blocksize);
if (data_bh)
memset(data_bh->b_data, 0, blocksize);
/*
* Since the xe_name_offset is based on ocfs2_xattr_header,
* there is a offset change corresponding to the change of
* ocfs2_xattr_header's position.
*/
off_change = offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
xe = &xb_xh->xh_entries[count - 1];
offset = le16_to_cpu(xe->xe_name_offset) + off_change;
size = blocksize - offset;
/* copy all the names and values. */
if (data_bh)
target = data_bh->b_data;
memcpy(target + offset, src + offset, size);
/* Init new header now. */
xh->xh_count = xb_xh->xh_count;
xh->xh_num_buckets = cpu_to_le16(1);
xh->xh_name_value_len = cpu_to_le16(size);
xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE - size);
/* copy all the entries. */
target = xh_bh->b_data;
offset = offsetof(struct ocfs2_xattr_header, xh_entries);
size = count * sizeof(struct ocfs2_xattr_entry);
memcpy(target + offset, (char *)xb_xh + offset, size);
/* Change the xe offset for all the xe because of the move. */
off_change = OCFS2_XATTR_BUCKET_SIZE - blocksize +
offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
for (i = 0; i < count; i++)
le16_add_cpu(&xh->xh_entries[i].xe_name_offset, off_change);
mlog(0, "copy entry: start = %u, size = %u, offset_change = %u\n",
offset, size, off_change);
sort(target + offset, count, sizeof(struct ocfs2_xattr_entry),
cmp_xe, swap_xe);
}
/*
* After we move xattr from block to index btree, we have to
* update ocfs2_xattr_search to the new xe and base.
*
* When the entry is in xattr block, xattr_bh indicates the storage place.
* While if the entry is in index b-tree, "bucket" indicates the
* real place of the xattr.
*/
static int ocfs2_xattr_update_xattr_search(struct inode *inode,
struct ocfs2_xattr_search *xs,
struct buffer_head *old_bh,
struct buffer_head *new_bh)
{
int ret = 0;
char *buf = old_bh->b_data;
struct ocfs2_xattr_block *old_xb = (struct ocfs2_xattr_block *)buf;
struct ocfs2_xattr_header *old_xh = &old_xb->xb_attrs.xb_header;
int i, blocksize = inode->i_sb->s_blocksize;
u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
xs->bucket.bhs[0] = new_bh;
get_bh(new_bh);
xs->bucket.xh = (struct ocfs2_xattr_header *)xs->bucket.bhs[0]->b_data;
xs->header = xs->bucket.xh;
xs->base = new_bh->b_data;
xs->end = xs->base + inode->i_sb->s_blocksize;
if (!xs->not_found) {
if (OCFS2_XATTR_BUCKET_SIZE != blocksize) {
ret = ocfs2_read_blocks(inode,
xs->bucket.bhs[0]->b_blocknr + 1,
blk_per_bucket - 1, &xs->bucket.bhs[1],
0);
if (ret) {
mlog_errno(ret);
return ret;
}
i = xs->here - old_xh->xh_entries;
xs->here = &xs->header->xh_entries[i];
}
}
return ret;
}
static int ocfs2_xattr_create_index_block(struct inode *inode,
struct ocfs2_xattr_search *xs)
{
int ret, credits = OCFS2_SUBALLOC_ALLOC;
u32 bit_off, len;
u64 blkno;
handle_t *handle;
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
struct ocfs2_inode_info *oi = OCFS2_I(inode);
struct ocfs2_alloc_context *data_ac;
struct buffer_head *xh_bh = NULL, *data_bh = NULL;
struct buffer_head *xb_bh = xs->xattr_bh;
struct ocfs2_xattr_block *xb =
(struct ocfs2_xattr_block *)xb_bh->b_data;
struct ocfs2_xattr_tree_root *xr;
u16 xb_flags = le16_to_cpu(xb->xb_flags);
u16 bpb = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
mlog(0, "create xattr index block for %llu\n",
(unsigned long long)xb_bh->b_blocknr);
BUG_ON(xb_flags & OCFS2_XATTR_INDEXED);
ret = ocfs2_reserve_clusters(osb, 1, &data_ac);
if (ret) {
mlog_errno(ret);
goto out;
}
/*
* XXX:
* We can use this lock for now, and maybe move to a dedicated mutex
* if performance becomes a problem later.
*/
down_write(&oi->ip_alloc_sem);
/*
* 3 more credits, one for xattr block update, one for the 1st block
* of the new xattr bucket and one for the value/data.
*/
credits += 3;
handle = ocfs2_start_trans(osb, credits);
if (IS_ERR(handle)) {
ret = PTR_ERR(handle);
mlog_errno(ret);
goto out_sem;
}
ret = ocfs2_journal_access(handle, inode, xb_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (ret) {
mlog_errno(ret);
goto out_commit;
}
ret = ocfs2_claim_clusters(osb, handle, data_ac, 1, &bit_off, &len);
if (ret) {
mlog_errno(ret);
goto out_commit;
}
/*
* The bucket may spread in many blocks, and
* we will only touch the 1st block and the last block
* in the whole bucket(one for entry and one for data).
*/
blkno = ocfs2_clusters_to_blocks(inode->i_sb, bit_off);
mlog(0, "allocate 1 cluster from %llu to xattr block\n", blkno);
xh_bh = sb_getblk(inode->i_sb, blkno);
if (!xh_bh) {
ret = -EIO;
mlog_errno(ret);
goto out_commit;
}
ocfs2_set_new_buffer_uptodate(inode, xh_bh);
ret = ocfs2_journal_access(handle, inode, xh_bh,
OCFS2_JOURNAL_ACCESS_CREATE);
if (ret) {
mlog_errno(ret);
goto out_commit;
}
if (bpb > 1) {
data_bh = sb_getblk(inode->i_sb, blkno + bpb - 1);
if (!data_bh) {
ret = -EIO;
mlog_errno(ret);
goto out_commit;
}
ocfs2_set_new_buffer_uptodate(inode, data_bh);
ret = ocfs2_journal_access(handle, inode, data_bh,
OCFS2_JOURNAL_ACCESS_CREATE);
if (ret) {
mlog_errno(ret);
goto out_commit;
}
}
ocfs2_cp_xattr_block_to_bucket(inode, xb_bh, xh_bh, data_bh);
ocfs2_journal_dirty(handle, xh_bh);
if (data_bh)
ocfs2_journal_dirty(handle, data_bh);
ocfs2_xattr_update_xattr_search(inode, xs, xb_bh, xh_bh);
/* Change from ocfs2_xattr_header to ocfs2_xattr_tree_root */
memset(&xb->xb_attrs, 0, inode->i_sb->s_blocksize -
offsetof(struct ocfs2_xattr_block, xb_attrs));
xr = &xb->xb_attrs.xb_root;
xr->xt_clusters = cpu_to_le32(1);
xr->xt_last_eb_blk = 0;
xr->xt_list.l_tree_depth = 0;
xr->xt_list.l_count = cpu_to_le16(ocfs2_xattr_recs_per_xb(inode->i_sb));
xr->xt_list.l_next_free_rec = cpu_to_le16(1);
xr->xt_list.l_recs[0].e_cpos = 0;
xr->xt_list.l_recs[0].e_blkno = cpu_to_le64(blkno);
xr->xt_list.l_recs[0].e_leaf_clusters = cpu_to_le16(1);
xb->xb_flags = cpu_to_le16(xb_flags | OCFS2_XATTR_INDEXED);
ret = ocfs2_journal_dirty(handle, xb_bh);
if (ret) {
mlog_errno(ret);
goto out_commit;
}
out_commit:
ocfs2_commit_trans(osb, handle);
out_sem:
up_write(&oi->ip_alloc_sem);
out:
if (data_ac)
ocfs2_free_alloc_context(data_ac);
brelse(xh_bh);
brelse(data_bh);
return ret;
}
static int cmp_xe_offset(const void *a, const void *b)
{
const struct ocfs2_xattr_entry *l = a, *r = b;
u32 l_name_offset = le16_to_cpu(l->xe_name_offset);
u32 r_name_offset = le16_to_cpu(r->xe_name_offset);
if (l_name_offset < r_name_offset)
return 1;
if (l_name_offset > r_name_offset)
return -1;
return 0;
}
/*
* defrag a xattr bucket if we find that the bucket has some
* holes beteen name/value pairs.
* We will move all the name/value pairs to the end of the bucket
* so that we can spare some space for insertion.
*/
static int ocfs2_defrag_xattr_bucket(struct inode *inode,
struct ocfs2_xattr_bucket *bucket)
{
int ret, i;
size_t end, offset, len, value_len;
struct ocfs2_xattr_header *xh;
char *entries, *buf, *bucket_buf = NULL;
u64 blkno = bucket->bhs[0]->b_blocknr;
u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
u16 xh_free_start;
size_t blocksize = inode->i_sb->s_blocksize;
handle_t *handle;
struct buffer_head **bhs;
struct ocfs2_xattr_entry *xe;
bhs = kzalloc(sizeof(struct buffer_head *) * blk_per_bucket,
GFP_NOFS);
if (!bhs)
return -ENOMEM;
ret = ocfs2_read_blocks(inode, blkno, blk_per_bucket, bhs, 0);
if (ret)
goto out;
/*
* In order to make the operation more efficient and generic,
* we copy all the blocks into a contiguous memory and do the
* defragment there, so if anything is error, we will not touch
* the real block.
*/
bucket_buf = kmalloc(OCFS2_XATTR_BUCKET_SIZE, GFP_NOFS);
if (!bucket_buf) {
ret = -EIO;
goto out;
}
buf = bucket_buf;
for (i = 0; i < blk_per_bucket; i++, buf += blocksize)
memcpy(buf, bhs[i]->b_data, blocksize);
handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)), blk_per_bucket);
if (IS_ERR(handle)) {
ret = PTR_ERR(handle);
handle = NULL;
mlog_errno(ret);
goto out;
}
for (i = 0; i < blk_per_bucket; i++) {
ret = ocfs2_journal_access(handle, inode, bhs[i],
OCFS2_JOURNAL_ACCESS_WRITE);
if (ret < 0) {
mlog_errno(ret);
goto commit;
}
}
xh = (struct ocfs2_xattr_header *)bucket_buf;
entries = (char *)xh->xh_entries;
xh_free_start = le16_to_cpu(xh->xh_free_start);
mlog(0, "adjust xattr bucket in %llu, count = %u, "
"xh_free_start = %u, xh_name_value_len = %u.\n",
blkno, le16_to_cpu(xh->xh_count), xh_free_start,
le16_to_cpu(xh->xh_name_value_len));
/*
* sort all the entries by their offset.
* the largest will be the first, so that we can
* move them to the end one by one.
*/
sort(entries, le16_to_cpu(xh->xh_count),
sizeof(struct ocfs2_xattr_entry),
cmp_xe_offset, swap_xe);
/* Move all name/values to the end of the bucket. */
xe = xh->xh_entries;
end = OCFS2_XATTR_BUCKET_SIZE;
for (i = 0; i < le16_to_cpu(xh->xh_count); i++, xe++) {
offset = le16_to_cpu(xe->xe_name_offset);
if (ocfs2_xattr_is_local(xe))
value_len = OCFS2_XATTR_SIZE(
le64_to_cpu(xe->xe_value_size));
else
value_len = OCFS2_XATTR_ROOT_SIZE;
len = OCFS2_XATTR_SIZE(xe->xe_name_len) + value_len;
/*
* We must make sure that the name/value pair
* exist in the same block. So adjust end to
* the previous block end if needed.
*/
if (((end - len) / blocksize !=
(end - 1) / blocksize))
end = end - end % blocksize;
if (end > offset + len) {
memmove(bucket_buf + end - len,
bucket_buf + offset, len);
xe->xe_name_offset = cpu_to_le16(end - len);
}
mlog_bug_on_msg(end < offset + len, "Defrag check failed for "
"bucket %llu\n", (unsigned long long)blkno);
end -= len;
}
mlog_bug_on_msg(xh_free_start > end, "Defrag check failed for "
"bucket %llu\n", (unsigned long long)blkno);
if (xh_free_start == end)
goto commit;
memset(bucket_buf + xh_free_start, 0, end - xh_free_start);
xh->xh_free_start = cpu_to_le16(end);
/* sort the entries by their name_hash. */
sort(entries, le16_to_cpu(xh->xh_count),
sizeof(struct ocfs2_xattr_entry),
cmp_xe, swap_xe);
buf = bucket_buf;
for (i = 0; i < blk_per_bucket; i++, buf += blocksize) {
memcpy(bhs[i]->b_data, buf, blocksize);
ocfs2_journal_dirty(handle, bhs[i]);
}
commit:
ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
out:
if (bhs) {
for (i = 0; i < blk_per_bucket; i++)
brelse(bhs[i]);
}
kfree(bhs);
kfree(bucket_buf);
return ret;
}
/*
* Move half nums of the xattr bucket in the previous cluster to this new
* cluster. We only touch the last cluster of the previous extend record.
*
* first_bh is the first buffer_head of a series of bucket in the same
* extent rec and header_bh is the header of one bucket in this cluster.
* They will be updated if we move the data header_bh contains to the new
* cluster. first_hash will be set as the 1st xe's name_hash of the new cluster.
*/
static int ocfs2_mv_xattr_bucket_cross_cluster(struct inode *inode,
handle_t *handle,
struct buffer_head **first_bh,
struct buffer_head **header_bh,
u64 new_blkno,
u64 prev_blkno,
u32 num_clusters,
u32 *first_hash)
{
int i, ret, credits;
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
int bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
int num_buckets = ocfs2_xattr_buckets_per_cluster(osb);
int blocksize = inode->i_sb->s_blocksize;
struct buffer_head *old_bh, *new_bh, *prev_bh, *new_first_bh = NULL;
struct ocfs2_xattr_header *new_xh;
struct ocfs2_xattr_header *xh =
(struct ocfs2_xattr_header *)((*first_bh)->b_data);
BUG_ON(le16_to_cpu(xh->xh_num_buckets) < num_buckets);
BUG_ON(OCFS2_XATTR_BUCKET_SIZE == osb->s_clustersize);
prev_bh = *first_bh;
get_bh(prev_bh);
xh = (struct ocfs2_xattr_header *)prev_bh->b_data;
prev_blkno += (num_clusters - 1) * bpc + bpc / 2;
mlog(0, "move half of xattrs in cluster %llu to %llu\n",
prev_blkno, new_blkno);
/*
* We need to update the 1st half of the new cluster and
* 1 more for the update of the 1st bucket of the previous
* extent record.
*/
credits = bpc / 2 + 1;
ret = ocfs2_extend_trans(handle, credits);
if (ret) {
mlog_errno(ret);
goto out;
}
ret = ocfs2_journal_access(handle, inode, prev_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (ret) {
mlog_errno(ret);
goto out;
}
for (i = 0; i < bpc / 2; i++, prev_blkno++, new_blkno++) {
old_bh = new_bh = NULL;
new_bh = sb_getblk(inode->i_sb, new_blkno);
if (!new_bh) {
ret = -EIO;
mlog_errno(ret);
goto out;
}
ocfs2_set_new_buffer_uptodate(inode, new_bh);
ret = ocfs2_journal_access(handle, inode, new_bh,
OCFS2_JOURNAL_ACCESS_CREATE);
if (ret < 0) {
mlog_errno(ret);
brelse(new_bh);
goto out;
}
ret = ocfs2_read_block(inode, prev_blkno, &old_bh);
if (ret < 0) {
mlog_errno(ret);
brelse(new_bh);
goto out;
}
memcpy(new_bh->b_data, old_bh->b_data, blocksize);
if (i == 0) {
new_xh = (struct ocfs2_xattr_header *)new_bh->b_data;
new_xh->xh_num_buckets = cpu_to_le16(num_buckets / 2);
if (first_hash)
*first_hash = le32_to_cpu(
new_xh->xh_entries[0].xe_name_hash);
new_first_bh = new_bh;
get_bh(new_first_bh);
}
ocfs2_journal_dirty(handle, new_bh);
if (*header_bh == old_bh) {
brelse(*header_bh);
*header_bh = new_bh;
get_bh(*header_bh);
brelse(*first_bh);
*first_bh = new_first_bh;
get_bh(*first_bh);
}
brelse(new_bh);
brelse(old_bh);
}
le16_add_cpu(&xh->xh_num_buckets, -(num_buckets / 2));
ocfs2_journal_dirty(handle, prev_bh);
out:
brelse(prev_bh);
brelse(new_first_bh);
return ret;
}
static int ocfs2_read_xattr_bucket(struct inode *inode,
u64 blkno,
struct buffer_head **bhs,
int new)
{
int ret = 0;
u16 i, blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
if (!new)
return ocfs2_read_blocks(inode, blkno,
blk_per_bucket, bhs, 0);
for (i = 0; i < blk_per_bucket; i++) {
bhs[i] = sb_getblk(inode->i_sb, blkno + i);
if (bhs[i] == NULL) {
ret = -EIO;
mlog_errno(ret);
break;
}
ocfs2_set_new_buffer_uptodate(inode, bhs[i]);
}
return ret;
}
/*
* Move half num of the xattrs in old bucket(blk) to new bucket(new_blk).
* first_hash will record the 1st hash of the new bucket.
*/
static int ocfs2_half_xattr_bucket(struct inode *inode,
handle_t *handle,
u64 blk,
u64 new_blk,
u32 *first_hash,
int new_bucket_head)
{
int ret, i;
u16 count, start, len, name_value_len, xe_len, name_offset;
u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
struct buffer_head **s_bhs, **t_bhs = NULL;
struct ocfs2_xattr_header *xh;
struct ocfs2_xattr_entry *xe;
int blocksize = inode->i_sb->s_blocksize;
mlog(0, "move half of xattrs from bucket %llu to %llu\n",
blk, new_blk);
s_bhs = kcalloc(blk_per_bucket, sizeof(struct buffer_head *), GFP_NOFS);
if (!s_bhs)
return -ENOMEM;
ret = ocfs2_read_xattr_bucket(inode, blk, s_bhs, 0);
if (ret) {
mlog_errno(ret);
goto out;
}
ret = ocfs2_journal_access(handle, inode, s_bhs[0],
OCFS2_JOURNAL_ACCESS_WRITE);
if (ret) {
mlog_errno(ret);
goto out;
}
t_bhs = kcalloc(blk_per_bucket, sizeof(struct buffer_head *), GFP_NOFS);
if (!t_bhs) {
ret = -ENOMEM;
goto out;
}
ret = ocfs2_read_xattr_bucket(inode, new_blk, t_bhs, new_bucket_head);
if (ret) {
mlog_errno(ret);
goto out;
}
for (i = 0; i < blk_per_bucket; i++) {
ret = ocfs2_journal_access(handle, inode, t_bhs[i],
OCFS2_JOURNAL_ACCESS_CREATE);
if (ret) {
mlog_errno(ret);
goto out;
}
}
/* copy the whole bucket to the new first. */
for (i = 0; i < blk_per_bucket; i++)
memcpy(t_bhs[i]->b_data, s_bhs[i]->b_data, blocksize);
/* update the new bucket. */
xh = (struct ocfs2_xattr_header *)t_bhs[0]->b_data;
count = le16_to_cpu(xh->xh_count);
start = count / 2;
/*
* Calculate the total name/value len and xh_free_start for
* the old bucket first.
*/
name_offset = OCFS2_XATTR_BUCKET_SIZE;
name_value_len = 0;
for (i = 0; i < start; i++) {
xe = &xh->xh_entries[i];
xe_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
if (ocfs2_xattr_is_local(xe))
xe_len +=
OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
else
xe_len += OCFS2_XATTR_ROOT_SIZE;
name_value_len += xe_len;
if (le16_to_cpu(xe->xe_name_offset) < name_offset)
name_offset = le16_to_cpu(xe->xe_name_offset);
}
/*
* Now begin the modification to the new bucket.
*
* In the new bucket, We just move the xattr entry to the beginning
* and don't touch the name/value. So there will be some holes in the
* bucket, and they will be removed when ocfs2_defrag_xattr_bucket is
* called.
*/
xe = &xh->xh_entries[start];
len = sizeof(struct ocfs2_xattr_entry) * (count - start);
mlog(0, "mv xattr entry len %d from %d to %d\n", len,
(int)((char *)xe - (char *)xh),
(int)((char *)xh->xh_entries - (char *)xh));
memmove((char *)xh->xh_entries, (char *)xe, len);
xe = &xh->xh_entries[count - start];
len = sizeof(struct ocfs2_xattr_entry) * start;
memset((char *)xe, 0, len);
le16_add_cpu(&xh->xh_count, -start);
le16_add_cpu(&xh->xh_name_value_len, -name_value_len);
/* Calculate xh_free_start for the new bucket. */
xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE);
for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
xe = &xh->xh_entries[i];
xe_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
if (ocfs2_xattr_is_local(xe))
xe_len +=
OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
else
xe_len += OCFS2_XATTR_ROOT_SIZE;
if (le16_to_cpu(xe->xe_name_offset) <
le16_to_cpu(xh->xh_free_start))
xh->xh_free_start = xe->xe_name_offset;
}
/* set xh->xh_num_buckets for the new xh. */
if (new_bucket_head)
xh->xh_num_buckets = cpu_to_le16(1);
else
xh->xh_num_buckets = 0;
for (i = 0; i < blk_per_bucket; i++) {
ocfs2_journal_dirty(handle, t_bhs[i]);
if (ret)
mlog_errno(ret);
}
/* store the first_hash of the new bucket. */
if (first_hash)
*first_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash);
/*
* Now only update the 1st block of the old bucket.
* Please note that the entry has been sorted already above.
*/
xh = (struct ocfs2_xattr_header *)s_bhs[0]->b_data;
memset(&xh->xh_entries[start], 0,
sizeof(struct ocfs2_xattr_entry) * (count - start));
xh->xh_count = cpu_to_le16(start);
xh->xh_free_start = cpu_to_le16(name_offset);
xh->xh_name_value_len = cpu_to_le16(name_value_len);
ocfs2_journal_dirty(handle, s_bhs[0]);
if (ret)
mlog_errno(ret);
out:
if (s_bhs) {
for (i = 0; i < blk_per_bucket; i++)
brelse(s_bhs[i]);
}
kfree(s_bhs);
if (t_bhs) {
for (i = 0; i < blk_per_bucket; i++)
brelse(t_bhs[i]);
}
kfree(t_bhs);
return ret;
}
/*
* Copy xattr from one bucket to another bucket.
*
* The caller must make sure that the journal transaction
* has enough space for journaling.
*/
static int ocfs2_cp_xattr_bucket(struct inode *inode,
handle_t *handle,
u64 s_blkno,
u64 t_blkno,
int t_is_new)
{
int ret, i;
int blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
int blocksize = inode->i_sb->s_blocksize;
struct buffer_head **s_bhs, **t_bhs = NULL;
BUG_ON(s_blkno == t_blkno);
mlog(0, "cp bucket %llu to %llu, target is %d\n",
s_blkno, t_blkno, t_is_new);
s_bhs = kzalloc(sizeof(struct buffer_head *) * blk_per_bucket,
GFP_NOFS);
if (!s_bhs)
return -ENOMEM;
ret = ocfs2_read_xattr_bucket(inode, s_blkno, s_bhs, 0);
if (ret)
goto out;
t_bhs = kzalloc(sizeof(struct buffer_head *) * blk_per_bucket,
GFP_NOFS);
if (!t_bhs) {
ret = -ENOMEM;
goto out;
}
ret = ocfs2_read_xattr_bucket(inode, t_blkno, t_bhs, t_is_new);
if (ret)
goto out;
for (i = 0; i < blk_per_bucket; i++) {
ret = ocfs2_journal_access(handle, inode, t_bhs[i],
OCFS2_JOURNAL_ACCESS_WRITE);
if (ret)
goto out;
}
for (i = 0; i < blk_per_bucket; i++) {
memcpy(t_bhs[i]->b_data, s_bhs[i]->b_data, blocksize);
ocfs2_journal_dirty(handle, t_bhs[i]);
}
out:
if (s_bhs) {
for (i = 0; i < blk_per_bucket; i++)
brelse(s_bhs[i]);
}
kfree(s_bhs);
if (t_bhs) {
for (i = 0; i < blk_per_bucket; i++)
brelse(t_bhs[i]);
}
kfree(t_bhs);
return ret;
}
/*
* Copy one xattr cluster from src_blk to to_blk.
* The to_blk will become the first bucket header of the cluster, so its
* xh_num_buckets will be initialized as the bucket num in the cluster.
*/
static int ocfs2_cp_xattr_cluster(struct inode *inode,
handle_t *handle,
struct buffer_head *first_bh,
u64 src_blk,
u64 to_blk,
u32 *first_hash)
{
int i, ret, credits;
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
int bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
int num_buckets = ocfs2_xattr_buckets_per_cluster(osb);
struct buffer_head *bh = NULL;
struct ocfs2_xattr_header *xh;
u64 to_blk_start = to_blk;
mlog(0, "cp xattrs from cluster %llu to %llu\n", src_blk, to_blk);
/*
* We need to update the new cluster and 1 more for the update of
* the 1st bucket of the previous extent rec.
*/
credits = bpc + 1;
ret = ocfs2_extend_trans(handle, credits);
if (ret) {
mlog_errno(ret);
goto out;
}
ret = ocfs2_journal_access(handle, inode, first_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (ret) {
mlog_errno(ret);
goto out;
}
for (i = 0; i < num_buckets; i++) {
ret = ocfs2_cp_xattr_bucket(inode, handle,
src_blk, to_blk, 1);
if (ret) {
mlog_errno(ret);
goto out;
}
src_blk += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
to_blk += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
}
/* update the old bucket header. */
xh = (struct ocfs2_xattr_header *)first_bh->b_data;
le16_add_cpu(&xh->xh_num_buckets, -num_buckets);
ocfs2_journal_dirty(handle, first_bh);
/* update the new bucket header. */
ret = ocfs2_read_block(inode, to_blk_start, &bh);
if (ret < 0) {
mlog_errno(ret);
goto out;
}
ret = ocfs2_journal_access(handle, inode, bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (ret) {
mlog_errno(ret);
goto out;
}
xh = (struct ocfs2_xattr_header *)bh->b_data;
xh->xh_num_buckets = cpu_to_le16(num_buckets);
ocfs2_journal_dirty(handle, bh);
if (first_hash)
*first_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash);
out:
brelse(bh);
return ret;
}
/*
* Move half of the xattrs in this cluster to the new cluster.
* This function should only be called when bucket size == cluster size.
* Otherwise ocfs2_mv_xattr_bucket_cross_cluster should be used instead.
*/
static int ocfs2_half_xattr_cluster(struct inode *inode,
handle_t *handle,
u64 prev_blk,
u64 new_blk,
u32 *first_hash)
{
u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
int ret, credits = 2 * blk_per_bucket;
BUG_ON(OCFS2_XATTR_BUCKET_SIZE < OCFS2_SB(inode->i_sb)->s_clustersize);
ret = ocfs2_extend_trans(handle, credits);
if (ret) {
mlog_errno(ret);
return ret;
}
/* Move half of the xattr in start_blk to the next bucket. */
return ocfs2_half_xattr_bucket(inode, handle, prev_blk,
new_blk, first_hash, 1);
}
/*
* Move some xattrs from the old cluster to the new one since they are not
* contiguous in ocfs2 xattr tree.
*
* new_blk starts a new separate cluster, and we will move some xattrs from
* prev_blk to it. v_start will be set as the first name hash value in this
* new cluster so that it can be used as e_cpos during tree insertion and
* don't collide with our original b-tree operations. first_bh and header_bh
* will also be updated since they will be used in ocfs2_extend_xattr_bucket
* to extend the insert bucket.
*
* The problem is how much xattr should we move to the new one and when should
* we update first_bh and header_bh?
* 1. If cluster size > bucket size, that means the previous cluster has more
* than 1 bucket, so just move half nums of bucket into the new cluster and
* update the first_bh and header_bh if the insert bucket has been moved
* to the new cluster.
* 2. If cluster_size == bucket_size:
* a) If the previous extent rec has more than one cluster and the insert
* place isn't in the last cluster, copy the entire last cluster to the
* new one. This time, we don't need to upate the first_bh and header_bh
* since they will not be moved into the new cluster.
* b) Otherwise, move the bottom half of the xattrs in the last cluster into
* the new one. And we set the extend flag to zero if the insert place is
* moved into the new allocated cluster since no extend is needed.
*/
static int ocfs2_adjust_xattr_cross_cluster(struct inode *inode,
handle_t *handle,
struct buffer_head **first_bh,
struct buffer_head **header_bh,
u64 new_blk,
u64 prev_blk,
u32 prev_clusters,
u32 *v_start,
int *extend)
{
int ret = 0;
int bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
mlog(0, "adjust xattrs from cluster %llu len %u to %llu\n",
prev_blk, prev_clusters, new_blk);
if (ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb)) > 1)
ret = ocfs2_mv_xattr_bucket_cross_cluster(inode,
handle,
first_bh,
header_bh,
new_blk,
prev_blk,
prev_clusters,
v_start);
else {
u64 last_blk = prev_blk + bpc * (prev_clusters - 1);
if (prev_clusters > 1 && (*header_bh)->b_blocknr != last_blk)
ret = ocfs2_cp_xattr_cluster(inode, handle, *first_bh,
last_blk, new_blk,
v_start);
else {
ret = ocfs2_half_xattr_cluster(inode, handle,
last_blk, new_blk,
v_start);
if ((*header_bh)->b_blocknr == last_blk && extend)
*extend = 0;
}
}
return ret;
}
/*
* Add a new cluster for xattr storage.
*
* If the new cluster is contiguous with the previous one, it will be
* appended to the same extent record, and num_clusters will be updated.
* If not, we will insert a new extent for it and move some xattrs in
* the last cluster into the new allocated one.
* We also need to limit the maximum size of a btree leaf, otherwise we'll
* lose the benefits of hashing because we'll have to search large leaves.
* So now the maximum size is OCFS2_MAX_XATTR_TREE_LEAF_SIZE(or clustersize,
* if it's bigger).
*
* first_bh is the first block of the previous extent rec and header_bh
* indicates the bucket we will insert the new xattrs. They will be updated
* when the header_bh is moved into the new cluster.
*/
static int ocfs2_add_new_xattr_cluster(struct inode *inode,
struct buffer_head *root_bh,
struct buffer_head **first_bh,
struct buffer_head **header_bh,
u32 *num_clusters,
u32 prev_cpos,
u64 prev_blkno,
int *extend)
{
int ret, credits;
u16 bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
u32 prev_clusters = *num_clusters;
u32 clusters_to_add = 1, bit_off, num_bits, v_start = 0;
u64 block;
handle_t *handle = NULL;
struct ocfs2_alloc_context *data_ac = NULL;
struct ocfs2_alloc_context *meta_ac = NULL;
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
struct ocfs2_extent_tree et;
mlog(0, "Add new xattr cluster for %llu, previous xattr hash = %u, "
"previous xattr blkno = %llu\n",
(unsigned long long)OCFS2_I(inode)->ip_blkno,
prev_cpos, prev_blkno);
ocfs2_init_xattr_tree_extent_tree(&et, inode, root_bh);
ret = ocfs2_lock_allocators(inode, &et, clusters_to_add, 0,
&data_ac, &meta_ac);
if (ret) {
mlog_errno(ret);
goto leave;
}
credits = ocfs2_calc_extend_credits(osb->sb, et.et_root_el,
clusters_to_add);
handle = ocfs2_start_trans(osb, credits);
if (IS_ERR(handle)) {
ret = PTR_ERR(handle);
handle = NULL;
mlog_errno(ret);
goto leave;
}
ret = ocfs2_journal_access(handle, inode, root_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (ret < 0) {
mlog_errno(ret);
goto leave;
}
ret = __ocfs2_claim_clusters(osb, handle, data_ac, 1,
clusters_to_add, &bit_off, &num_bits);
if (ret < 0) {
if (ret != -ENOSPC)
mlog_errno(ret);
goto leave;
}
BUG_ON(num_bits > clusters_to_add);
block = ocfs2_clusters_to_blocks(osb->sb, bit_off);
mlog(0, "Allocating %u clusters at block %u for xattr in inode %llu\n",
num_bits, bit_off, (unsigned long long)OCFS2_I(inode)->ip_blkno);
if (prev_blkno + prev_clusters * bpc == block &&
(prev_clusters + num_bits) << osb->s_clustersize_bits <=
OCFS2_MAX_XATTR_TREE_LEAF_SIZE) {
/*
* If this cluster is contiguous with the old one and
* adding this new cluster, we don't surpass the limit of
* OCFS2_MAX_XATTR_TREE_LEAF_SIZE, cool. We will let it be
* initialized and used like other buckets in the previous
* cluster.
* So add it as a contiguous one. The caller will handle
* its init process.
*/
v_start = prev_cpos + prev_clusters;
*num_clusters = prev_clusters + num_bits;
mlog(0, "Add contiguous %u clusters to previous extent rec.\n",
num_bits);
} else {
ret = ocfs2_adjust_xattr_cross_cluster(inode,
handle,
first_bh,
header_bh,
block,
prev_blkno,
prev_clusters,
&v_start,
extend);
if (ret) {
mlog_errno(ret);
goto leave;
}
}
if (handle->h_buffer_credits < credits) {
/*
* The journal has been restarted before, and don't
* have enough space for the insertion, so extend it
* here.
*/
ret = ocfs2_extend_trans(handle, credits);
if (ret) {
mlog_errno(ret);
goto leave;
}
}
mlog(0, "Insert %u clusters at block %llu for xattr at %u\n",
num_bits, block, v_start);
ret = ocfs2_insert_extent(osb, handle, inode, &et, v_start, block,
num_bits, 0, meta_ac);
if (ret < 0) {
mlog_errno(ret);
goto leave;
}
ret = ocfs2_journal_dirty(handle, root_bh);
if (ret < 0) {
mlog_errno(ret);
goto leave;
}
leave:
if (handle)
ocfs2_commit_trans(osb, handle);
if (data_ac)
ocfs2_free_alloc_context(data_ac);
if (meta_ac)
ocfs2_free_alloc_context(meta_ac);
return ret;
}
/*
* Extend a new xattr bucket and move xattrs to the end one by one until
* We meet with start_bh. Only move half of the xattrs to the bucket after it.
*/
static int ocfs2_extend_xattr_bucket(struct inode *inode,
struct buffer_head *first_bh,
struct buffer_head *start_bh,
u32 num_clusters)
{
int ret, credits;
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
u64 start_blk = start_bh->b_blocknr, end_blk;
u32 num_buckets = num_clusters * ocfs2_xattr_buckets_per_cluster(osb);
handle_t *handle;
struct ocfs2_xattr_header *first_xh =
(struct ocfs2_xattr_header *)first_bh->b_data;
u16 bucket = le16_to_cpu(first_xh->xh_num_buckets);
mlog(0, "extend xattr bucket in %llu, xattr extend rec starting "
"from %llu, len = %u\n", start_blk,
(unsigned long long)first_bh->b_blocknr, num_clusters);
BUG_ON(bucket >= num_buckets);
end_blk = first_bh->b_blocknr + (bucket - 1) * blk_per_bucket;
/*
* We will touch all the buckets after the start_bh(include it).
* Add one more bucket and modify the first_bh.
*/
credits = end_blk - start_blk + 2 * blk_per_bucket + 1;
handle = ocfs2_start_trans(osb, credits);
if (IS_ERR(handle)) {
ret = PTR_ERR(handle);
handle = NULL;
mlog_errno(ret);
goto out;
}
ret = ocfs2_journal_access(handle, inode, first_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (ret) {
mlog_errno(ret);
goto commit;
}
while (end_blk != start_blk) {
ret = ocfs2_cp_xattr_bucket(inode, handle, end_blk,
end_blk + blk_per_bucket, 0);
if (ret)
goto commit;
end_blk -= blk_per_bucket;
}
/* Move half of the xattr in start_blk to the next bucket. */
ret = ocfs2_half_xattr_bucket(inode, handle, start_blk,
start_blk + blk_per_bucket, NULL, 0);
le16_add_cpu(&first_xh->xh_num_buckets, 1);
ocfs2_journal_dirty(handle, first_bh);
commit:
ocfs2_commit_trans(osb, handle);
out:
return ret;
}
/*
* Add new xattr bucket in an extent record and adjust the buckets accordingly.
* xb_bh is the ocfs2_xattr_block.
* We will move all the buckets starting from header_bh to the next place. As
* for this one, half num of its xattrs will be moved to the next one.
*
* We will allocate a new cluster if current cluster is full and adjust
* header_bh and first_bh if the insert place is moved to the new cluster.
*/
static int ocfs2_add_new_xattr_bucket(struct inode *inode,
struct buffer_head *xb_bh,
struct buffer_head *header_bh)
{
struct ocfs2_xattr_header *first_xh = NULL;
struct buffer_head *first_bh = NULL;
struct ocfs2_xattr_block *xb =
(struct ocfs2_xattr_block *)xb_bh->b_data;
struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root;
struct ocfs2_extent_list *el = &xb_root->xt_list;
struct ocfs2_xattr_header *xh =
(struct ocfs2_xattr_header *)header_bh->b_data;
u32 name_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash);
struct super_block *sb = inode->i_sb;
struct ocfs2_super *osb = OCFS2_SB(sb);
int ret, num_buckets, extend = 1;
u64 p_blkno;
u32 e_cpos, num_clusters;
mlog(0, "Add new xattr bucket starting form %llu\n",
(unsigned long long)header_bh->b_blocknr);
/*
* Add refrence for header_bh here because it may be
* changed in ocfs2_add_new_xattr_cluster and we need
* to free it in the end.
*/
get_bh(header_bh);
ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &e_cpos,
&num_clusters, el);
if (ret) {
mlog_errno(ret);
goto out;
}
ret = ocfs2_read_block(inode, p_blkno, &first_bh);
if (ret) {
mlog_errno(ret);
goto out;
}
num_buckets = ocfs2_xattr_buckets_per_cluster(osb) * num_clusters;
first_xh = (struct ocfs2_xattr_header *)first_bh->b_data;
if (num_buckets == le16_to_cpu(first_xh->xh_num_buckets)) {
ret = ocfs2_add_new_xattr_cluster(inode,
xb_bh,
&first_bh,
&header_bh,
&num_clusters,
e_cpos,
p_blkno,
&extend);
if (ret) {
mlog_errno(ret);
goto out;
}
}
if (extend)
ret = ocfs2_extend_xattr_bucket(inode,
first_bh,
header_bh,
num_clusters);
if (ret)
mlog_errno(ret);
out:
brelse(first_bh);
brelse(header_bh);
return ret;
}
static inline char *ocfs2_xattr_bucket_get_val(struct inode *inode,
struct ocfs2_xattr_bucket *bucket,
int offs)
{
int block_off = offs >> inode->i_sb->s_blocksize_bits;
offs = offs % inode->i_sb->s_blocksize;
return bucket->bhs[block_off]->b_data + offs;
}
/*
* Handle the normal xattr set, including replace, delete and new.
*
* Note: "local" indicates the real data's locality. So we can't
* just its bucket locality by its length.
*/
static void ocfs2_xattr_set_entry_normal(struct inode *inode,
struct ocfs2_xattr_info *xi,
struct ocfs2_xattr_search *xs,
u32 name_hash,
int local)
{
struct ocfs2_xattr_entry *last, *xe;
int name_len = strlen(xi->name);
struct ocfs2_xattr_header *xh = xs->header;
u16 count = le16_to_cpu(xh->xh_count), start;
size_t blocksize = inode->i_sb->s_blocksize;
char *val;
size_t offs, size, new_size;
last = &xh->xh_entries[count];
if (!xs->not_found) {
xe = xs->here;
offs = le16_to_cpu(xe->xe_name_offset);
if (ocfs2_xattr_is_local(xe))
size = OCFS2_XATTR_SIZE(name_len) +
OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
else
size = OCFS2_XATTR_SIZE(name_len) +
OCFS2_XATTR_SIZE(OCFS2_XATTR_ROOT_SIZE);
/*
* If the new value will be stored outside, xi->value has been
* initalized as an empty ocfs2_xattr_value_root, and the same
* goes with xi->value_len, so we can set new_size safely here.
* See ocfs2_xattr_set_in_bucket.
*/
new_size = OCFS2_XATTR_SIZE(name_len) +
OCFS2_XATTR_SIZE(xi->value_len);
le16_add_cpu(&xh->xh_name_value_len, -size);
if (xi->value) {
if (new_size > size)
goto set_new_name_value;
/* Now replace the old value with new one. */
if (local)
xe->xe_value_size = cpu_to_le64(xi->value_len);
else
xe->xe_value_size = 0;
val = ocfs2_xattr_bucket_get_val(inode,
&xs->bucket, offs);
memset(val + OCFS2_XATTR_SIZE(name_len), 0,
size - OCFS2_XATTR_SIZE(name_len));
if (OCFS2_XATTR_SIZE(xi->value_len) > 0)
memcpy(val + OCFS2_XATTR_SIZE(name_len),
xi->value, xi->value_len);
le16_add_cpu(&xh->xh_name_value_len, new_size);
ocfs2_xattr_set_local(xe, local);
return;
} else {
/*
* Remove the old entry if there is more than one.
* We don't remove the last entry so that we can
* use it to indicate the hash value of the empty
* bucket.
*/
last -= 1;
le16_add_cpu(&xh->xh_count, -1);
if (xh->xh_count) {
memmove(xe, xe + 1,
(void *)last - (void *)xe);
memset(last, 0,
sizeof(struct ocfs2_xattr_entry));
} else
xh->xh_free_start =
cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE);
return;
}
} else {
/* find a new entry for insert. */
int low = 0, high = count - 1, tmp;
struct ocfs2_xattr_entry *tmp_xe;
while (low <= high && count) {
tmp = (low + high) / 2;
tmp_xe = &xh->xh_entries[tmp];
if (name_hash > le32_to_cpu(tmp_xe->xe_name_hash))
low = tmp + 1;
else if (name_hash <
le32_to_cpu(tmp_xe->xe_name_hash))
high = tmp - 1;
else {
low = tmp;
break;
}
}
xe = &xh->xh_entries[low];
if (low != count)
memmove(xe + 1, xe, (void *)last - (void *)xe);
le16_add_cpu(&xh->xh_count, 1);
memset(xe, 0, sizeof(struct ocfs2_xattr_entry));
xe->xe_name_hash = cpu_to_le32(name_hash);
xe->xe_name_len = name_len;
ocfs2_xattr_set_type(xe, xi->name_index);
}
set_new_name_value:
/* Insert the new name+value. */
size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_SIZE(xi->value_len);
/*
* We must make sure that the name/value pair
* exists in the same block.
*/
offs = le16_to_cpu(xh->xh_free_start);
start = offs - size;
if (start >> inode->i_sb->s_blocksize_bits !=
(offs - 1) >> inode->i_sb->s_blocksize_bits) {
offs = offs - offs % blocksize;
xh->xh_free_start = cpu_to_le16(offs);
}
val = ocfs2_xattr_bucket_get_val(inode,
&xs->bucket, offs - size);
xe->xe_name_offset = cpu_to_le16(offs - size);
memset(val, 0, size);
memcpy(val, xi->name, name_len);
memcpy(val + OCFS2_XATTR_SIZE(name_len), xi->value, xi->value_len);
xe->xe_value_size = cpu_to_le64(xi->value_len);
ocfs2_xattr_set_local(xe, local);
xs->here = xe;
le16_add_cpu(&xh->xh_free_start, -size);
le16_add_cpu(&xh->xh_name_value_len, size);
return;
}
static int ocfs2_xattr_bucket_handle_journal(struct inode *inode,
handle_t *handle,
struct ocfs2_xattr_search *xs,
struct buffer_head **bhs,
u16 bh_num)
{
int ret = 0, off, block_off;
struct ocfs2_xattr_entry *xe = xs->here;
/*
* First calculate all the blocks we should journal_access
* and journal_dirty. The first block should always be touched.
*/
ret = ocfs2_journal_dirty(handle, bhs[0]);
if (ret)
mlog_errno(ret);
/* calc the data. */
off = le16_to_cpu(xe->xe_name_offset);
block_off = off >> inode->i_sb->s_blocksize_bits;
ret = ocfs2_journal_dirty(handle, bhs[block_off]);
if (ret)
mlog_errno(ret);
return ret;
}
/*
* Set the xattr entry in the specified bucket.
* The bucket is indicated by xs->bucket and it should have the enough
* space for the xattr insertion.
*/
static int ocfs2_xattr_set_entry_in_bucket(struct inode *inode,
struct ocfs2_xattr_info *xi,
struct ocfs2_xattr_search *xs,
u32 name_hash,
int local)
{
int i, ret;
handle_t *handle = NULL;
u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
mlog(0, "Set xattr entry len = %lu index = %d in bucket %llu\n",
(unsigned long)xi->value_len, xi->name_index,
(unsigned long long)xs->bucket.bhs[0]->b_blocknr);
if (!xs->bucket.bhs[1]) {
ret = ocfs2_read_blocks(inode,
xs->bucket.bhs[0]->b_blocknr + 1,
blk_per_bucket - 1, &xs->bucket.bhs[1],
0);
if (ret) {
mlog_errno(ret);
goto out;
}
}
handle = ocfs2_start_trans(osb, blk_per_bucket);
if (IS_ERR(handle)) {
ret = PTR_ERR(handle);
handle = NULL;
mlog_errno(ret);
goto out;
}
for (i = 0; i < blk_per_bucket; i++) {
ret = ocfs2_journal_access(handle, inode, xs->bucket.bhs[i],
OCFS2_JOURNAL_ACCESS_WRITE);
if (ret < 0) {
mlog_errno(ret);
goto out;
}
}
ocfs2_xattr_set_entry_normal(inode, xi, xs, name_hash, local);
/*Only dirty the blocks we have touched in set xattr. */
ret = ocfs2_xattr_bucket_handle_journal(inode, handle, xs,
xs->bucket.bhs, blk_per_bucket);
if (ret)
mlog_errno(ret);
out:
ocfs2_commit_trans(osb, handle);
return ret;
}
static int ocfs2_xattr_value_update_size(struct inode *inode,
struct buffer_head *xe_bh,
struct ocfs2_xattr_entry *xe,
u64 new_size)
{
int ret;
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
handle_t *handle = NULL;
handle = ocfs2_start_trans(osb, 1);
if (handle == NULL) {
ret = -ENOMEM;
mlog_errno(ret);
goto out;
}
ret = ocfs2_journal_access(handle, inode, xe_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (ret < 0) {
mlog_errno(ret);
goto out_commit;
}
xe->xe_value_size = cpu_to_le64(new_size);
ret = ocfs2_journal_dirty(handle, xe_bh);
if (ret < 0)
mlog_errno(ret);
out_commit:
ocfs2_commit_trans(osb, handle);
out:
return ret;
}
/*
* Truncate the specified xe_off entry in xattr bucket.
* bucket is indicated by header_bh and len is the new length.
* Both the ocfs2_xattr_value_root and the entry will be updated here.
*
* Copy the new updated xe and xe_value_root to new_xe and new_xv if needed.
*/
static int ocfs2_xattr_bucket_value_truncate(struct inode *inode,
struct buffer_head *header_bh,
int xe_off,
int len)
{
int ret, offset;
u64 value_blk;
struct buffer_head *value_bh = NULL;
struct ocfs2_xattr_value_root *xv;
struct ocfs2_xattr_entry *xe;
struct ocfs2_xattr_header *xh =
(struct ocfs2_xattr_header *)header_bh->b_data;
size_t blocksize = inode->i_sb->s_blocksize;
xe = &xh->xh_entries[xe_off];
BUG_ON(!xe || ocfs2_xattr_is_local(xe));
offset = le16_to_cpu(xe->xe_name_offset) +
OCFS2_XATTR_SIZE(xe->xe_name_len);
value_blk = offset / blocksize;
/* We don't allow ocfs2_xattr_value to be stored in different block. */
BUG_ON(value_blk != (offset + OCFS2_XATTR_ROOT_SIZE - 1) / blocksize);
value_blk += header_bh->b_blocknr;
ret = ocfs2_read_block(inode, value_blk, &value_bh);
if (ret) {
mlog_errno(ret);
goto out;
}
xv = (struct ocfs2_xattr_value_root *)
(value_bh->b_data + offset % blocksize);
mlog(0, "truncate %u in xattr bucket %llu to %d bytes.\n",
xe_off, (unsigned long long)header_bh->b_blocknr, len);
ret = ocfs2_xattr_value_truncate(inode, value_bh, xv, len);
if (ret) {
mlog_errno(ret);
goto out;
}
ret = ocfs2_xattr_value_update_size(inode, header_bh, xe, len);
if (ret) {
mlog_errno(ret);
goto out;
}
out:
brelse(value_bh);
return ret;
}
static int ocfs2_xattr_bucket_value_truncate_xs(struct inode *inode,
struct ocfs2_xattr_search *xs,
int len)
{
int ret, offset;
struct ocfs2_xattr_entry *xe = xs->here;
struct ocfs2_xattr_header *xh = (struct ocfs2_xattr_header *)xs->base;
BUG_ON(!xs->bucket.bhs[0] || !xe || ocfs2_xattr_is_local(xe));
offset = xe - xh->xh_entries;
ret = ocfs2_xattr_bucket_value_truncate(inode, xs->bucket.bhs[0],
offset, len);
if (ret)
mlog_errno(ret);
return ret;
}
static int ocfs2_xattr_bucket_set_value_outside(struct inode *inode,
struct ocfs2_xattr_search *xs,
char *val,
int value_len)
{
int offset;
struct ocfs2_xattr_value_root *xv;
struct ocfs2_xattr_entry *xe = xs->here;
BUG_ON(!xs->base || !xe || ocfs2_xattr_is_local(xe));
offset = le16_to_cpu(xe->xe_name_offset) +
OCFS2_XATTR_SIZE(xe->xe_name_len);
xv = (struct ocfs2_xattr_value_root *)(xs->base + offset);
return __ocfs2_xattr_set_value_outside(inode, xv, val, value_len);
}
static int ocfs2_rm_xattr_cluster(struct inode *inode,
struct buffer_head *root_bh,
u64 blkno,
u32 cpos,
u32 len)
{
int ret;
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
struct inode *tl_inode = osb->osb_tl_inode;
handle_t *handle;
struct ocfs2_xattr_block *xb =
(struct ocfs2_xattr_block *)root_bh->b_data;
struct ocfs2_alloc_context *meta_ac = NULL;
struct ocfs2_cached_dealloc_ctxt dealloc;
struct ocfs2_extent_tree et;
ocfs2_init_xattr_tree_extent_tree(&et, inode, root_bh);
ocfs2_init_dealloc_ctxt(&dealloc);
mlog(0, "rm xattr extent rec at %u len = %u, start from %llu\n",
cpos, len, (unsigned long long)blkno);
ocfs2_remove_xattr_clusters_from_cache(inode, blkno, len);
ret = ocfs2_lock_allocators(inode, &et, 0, 1, NULL, &meta_ac);
if (ret) {
mlog_errno(ret);
return ret;
}
mutex_lock(&tl_inode->i_mutex);
if (ocfs2_truncate_log_needs_flush(osb)) {
ret = __ocfs2_flush_truncate_log(osb);
if (ret < 0) {
mlog_errno(ret);
goto out;
}
}
handle = ocfs2_start_trans(osb, OCFS2_REMOVE_EXTENT_CREDITS);
if (handle == NULL) {
ret = -ENOMEM;
mlog_errno(ret);
goto out;
}
ret = ocfs2_journal_access(handle, inode, root_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (ret) {
mlog_errno(ret);
goto out_commit;
}
ret = ocfs2_remove_extent(inode, &et, cpos, len, handle, meta_ac,
&dealloc);
if (ret) {
mlog_errno(ret);
goto out_commit;
}
le32_add_cpu(&xb->xb_attrs.xb_root.xt_clusters, -len);
ret = ocfs2_journal_dirty(handle, root_bh);
if (ret) {
mlog_errno(ret);
goto out_commit;
}
ret = ocfs2_truncate_log_append(osb, handle, blkno, len);
if (ret)
mlog_errno(ret);
out_commit:
ocfs2_commit_trans(osb, handle);
out:
ocfs2_schedule_truncate_log_flush(osb, 1);
mutex_unlock(&tl_inode->i_mutex);
if (meta_ac)
ocfs2_free_alloc_context(meta_ac);
ocfs2_run_deallocs(osb, &dealloc);
return ret;
}
static void ocfs2_xattr_bucket_remove_xs(struct inode *inode,
struct ocfs2_xattr_search *xs)
{
handle_t *handle = NULL;
struct ocfs2_xattr_header *xh = xs->bucket.xh;
struct ocfs2_xattr_entry *last = &xh->xh_entries[
le16_to_cpu(xh->xh_count) - 1];
int ret = 0;
handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)), 1);
if (IS_ERR(handle)) {
ret = PTR_ERR(handle);
mlog_errno(ret);
return;
}
ret = ocfs2_journal_access(handle, inode, xs->bucket.bhs[0],
OCFS2_JOURNAL_ACCESS_WRITE);
if (ret) {
mlog_errno(ret);
goto out_commit;
}
/* Remove the old entry. */
memmove(xs->here, xs->here + 1,
(void *)last - (void *)xs->here);
memset(last, 0, sizeof(struct ocfs2_xattr_entry));
le16_add_cpu(&xh->xh_count, -1);
ret = ocfs2_journal_dirty(handle, xs->bucket.bhs[0]);
if (ret < 0)
mlog_errno(ret);
out_commit:
ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
}
/*
* Set the xattr name/value in the bucket specified in xs.
*
* As the new value in xi may be stored in the bucket or in an outside cluster,
* we divide the whole process into 3 steps:
* 1. insert name/value in the bucket(ocfs2_xattr_set_entry_in_bucket)
* 2. truncate of the outside cluster(ocfs2_xattr_bucket_value_truncate_xs)
* 3. Set the value to the outside cluster(ocfs2_xattr_bucket_set_value_outside)
* 4. If the clusters for the new outside value can't be allocated, we need
* to free the xattr we allocated in set.
*/
static int ocfs2_xattr_set_in_bucket(struct inode *inode,
struct ocfs2_xattr_info *xi,
struct ocfs2_xattr_search *xs)
{
int ret, local = 1;
size_t value_len;
char *val = (char *)xi->value;
struct ocfs2_xattr_entry *xe = xs->here;
u32 name_hash = ocfs2_xattr_name_hash(inode, xi->name,
strlen(xi->name));
if (!xs->not_found && !ocfs2_xattr_is_local(xe)) {
/*
* We need to truncate the xattr storage first.
*
* If both the old and new value are stored to
* outside block, we only need to truncate
* the storage and then set the value outside.
*
* If the new value should be stored within block,
* we should free all the outside block first and
* the modification to the xattr block will be done
* by following steps.
*/
if (xi->value_len > OCFS2_XATTR_INLINE_SIZE)
value_len = xi->value_len;
else
value_len = 0;
ret = ocfs2_xattr_bucket_value_truncate_xs(inode, xs,
value_len);
if (ret)
goto out;
if (value_len)
goto set_value_outside;
}
value_len = xi->value_len;
/* So we have to handle the inside block change now. */
if (value_len > OCFS2_XATTR_INLINE_SIZE) {
/*
* If the new value will be stored outside of block,
* initalize a new empty value root and insert it first.
*/
local = 0;
xi->value = &def_xv;
xi->value_len = OCFS2_XATTR_ROOT_SIZE;
}
ret = ocfs2_xattr_set_entry_in_bucket(inode, xi, xs, name_hash, local);
if (ret) {
mlog_errno(ret);
goto out;
}
if (value_len <= OCFS2_XATTR_INLINE_SIZE)
goto out;
/* allocate the space now for the outside block storage. */
ret = ocfs2_xattr_bucket_value_truncate_xs(inode, xs,
value_len);
if (ret) {
mlog_errno(ret);
if (xs->not_found) {
/*
* We can't allocate enough clusters for outside
* storage and we have allocated xattr already,
* so need to remove it.
*/
ocfs2_xattr_bucket_remove_xs(inode, xs);
}
goto out;
}
set_value_outside:
ret = ocfs2_xattr_bucket_set_value_outside(inode, xs, val, value_len);
out:
return ret;
}
/* check whether the xattr bucket is filled up with the same hash value. */
static int ocfs2_check_xattr_bucket_collision(struct inode *inode,
struct ocfs2_xattr_bucket *bucket)
{
struct ocfs2_xattr_header *xh = bucket->xh;
if (xh->xh_entries[le16_to_cpu(xh->xh_count) - 1].xe_name_hash ==
xh->xh_entries[0].xe_name_hash) {
mlog(ML_ERROR, "Too much hash collision in xattr bucket %llu, "
"hash = %u\n",
(unsigned long long)bucket->bhs[0]->b_blocknr,
le32_to_cpu(xh->xh_entries[0].xe_name_hash));
return -ENOSPC;
}
return 0;
}
static int ocfs2_xattr_set_entry_index_block(struct inode *inode,
struct ocfs2_xattr_info *xi,
struct ocfs2_xattr_search *xs)
{
struct ocfs2_xattr_header *xh;
struct ocfs2_xattr_entry *xe;
u16 count, header_size, xh_free_start;
int i, free, max_free, need, old;
size_t value_size = 0, name_len = strlen(xi->name);
size_t blocksize = inode->i_sb->s_blocksize;
int ret, allocation = 0;
u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
mlog_entry("Set xattr %s in xattr index block\n", xi->name);
try_again:
xh = xs->header;
count = le16_to_cpu(xh->xh_count);
xh_free_start = le16_to_cpu(xh->xh_free_start);
header_size = sizeof(struct ocfs2_xattr_header) +
count * sizeof(struct ocfs2_xattr_entry);
max_free = OCFS2_XATTR_BUCKET_SIZE -
le16_to_cpu(xh->xh_name_value_len) - header_size;
mlog_bug_on_msg(header_size > blocksize, "bucket %llu has header size "
"of %u which exceed block size\n",
(unsigned long long)xs->bucket.bhs[0]->b_blocknr,
header_size);
if (xi->value && xi->value_len > OCFS2_XATTR_INLINE_SIZE)
value_size = OCFS2_XATTR_ROOT_SIZE;
else if (xi->value)
value_size = OCFS2_XATTR_SIZE(xi->value_len);
if (xs->not_found)
need = sizeof(struct ocfs2_xattr_entry) +
OCFS2_XATTR_SIZE(name_len) + value_size;
else {
need = value_size + OCFS2_XATTR_SIZE(name_len);
/*
* We only replace the old value if the new length is smaller
* than the old one. Otherwise we will allocate new space in the
* bucket to store it.
*/
xe = xs->here;
if (ocfs2_xattr_is_local(xe))
old = OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size));
else
old = OCFS2_XATTR_SIZE(OCFS2_XATTR_ROOT_SIZE);
if (old >= value_size)
need = 0;
}
free = xh_free_start - header_size;
/*
* We need to make sure the new name/value pair
* can exist in the same block.
*/
if (xh_free_start % blocksize < need)
free -= xh_free_start % blocksize;
mlog(0, "xs->not_found = %d, in xattr bucket %llu: free = %d, "
"need = %d, max_free = %d, xh_free_start = %u, xh_name_value_len ="
" %u\n", xs->not_found,
(unsigned long long)xs->bucket.bhs[0]->b_blocknr,
free, need, max_free, le16_to_cpu(xh->xh_free_start),
le16_to_cpu(xh->xh_name_value_len));
if (free < need || count == ocfs2_xattr_max_xe_in_bucket(inode->i_sb)) {
if (need <= max_free &&
count < ocfs2_xattr_max_xe_in_bucket(inode->i_sb)) {
/*
* We can create the space by defragment. Since only the
* name/value will be moved, the xe shouldn't be changed
* in xs.
*/
ret = ocfs2_defrag_xattr_bucket(inode, &xs->bucket);
if (ret) {
mlog_errno(ret);
goto out;
}
xh_free_start = le16_to_cpu(xh->xh_free_start);
free = xh_free_start - header_size;
if (xh_free_start % blocksize < need)
free -= xh_free_start % blocksize;
if (free >= need)
goto xattr_set;
mlog(0, "Can't get enough space for xattr insert by "
"defragment. Need %u bytes, but we have %d, so "
"allocate new bucket for it.\n", need, free);
}
/*
* We have to add new buckets or clusters and one
* allocation should leave us enough space for insert.
*/
BUG_ON(allocation);
/*
* We do not allow for overlapping ranges between buckets. And
* the maximum number of collisions we will allow for then is
* one bucket's worth, so check it here whether we need to
* add a new bucket for the insert.
*/
ret = ocfs2_check_xattr_bucket_collision(inode, &xs->bucket);
if (ret) {
mlog_errno(ret);
goto out;
}
ret = ocfs2_add_new_xattr_bucket(inode,
xs->xattr_bh,
xs->bucket.bhs[0]);
if (ret) {
mlog_errno(ret);
goto out;
}
for (i = 0; i < blk_per_bucket; i++)
brelse(xs->bucket.bhs[i]);
memset(&xs->bucket, 0, sizeof(xs->bucket));
ret = ocfs2_xattr_index_block_find(inode, xs->xattr_bh,
xi->name_index,
xi->name, xs);
if (ret && ret != -ENODATA)
goto out;
xs->not_found = ret;
allocation = 1;
goto try_again;
}
xattr_set:
ret = ocfs2_xattr_set_in_bucket(inode, xi, xs);
out:
mlog_exit(ret);
return ret;
}
static int ocfs2_delete_xattr_in_bucket(struct inode *inode,
struct ocfs2_xattr_bucket *bucket,
void *para)
{
int ret = 0;
struct ocfs2_xattr_header *xh = bucket->xh;
u16 i;
struct ocfs2_xattr_entry *xe;
for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
xe = &xh->xh_entries[i];
if (ocfs2_xattr_is_local(xe))
continue;
ret = ocfs2_xattr_bucket_value_truncate(inode,
bucket->bhs[0],
i, 0);
if (ret) {
mlog_errno(ret);
break;
}
}
return ret;
}
static int ocfs2_delete_xattr_index_block(struct inode *inode,
struct buffer_head *xb_bh)
{
struct ocfs2_xattr_block *xb =
(struct ocfs2_xattr_block *)xb_bh->b_data;
struct ocfs2_extent_list *el = &xb->xb_attrs.xb_root.xt_list;
int ret = 0;
u32 name_hash = UINT_MAX, e_cpos, num_clusters;
u64 p_blkno;
if (le16_to_cpu(el->l_next_free_rec) == 0)
return 0;
while (name_hash > 0) {
ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno,
&e_cpos, &num_clusters, el);
if (ret) {
mlog_errno(ret);
goto out;
}
ret = ocfs2_iterate_xattr_buckets(inode, p_blkno, num_clusters,
ocfs2_delete_xattr_in_bucket,
NULL);
if (ret) {
mlog_errno(ret);
goto out;
}
ret = ocfs2_rm_xattr_cluster(inode, xb_bh,
p_blkno, e_cpos, num_clusters);
if (ret) {
mlog_errno(ret);
break;
}
if (e_cpos == 0)
break;
name_hash = e_cpos - 1;
}
out:
return ret;
}
/*
* 'trusted' attributes support
*/
#define XATTR_TRUSTED_PREFIX "trusted."
static size_t ocfs2_xattr_trusted_list(struct inode *inode, char *list,
size_t list_size, const char *name,
size_t name_len)
{
const size_t prefix_len = sizeof(XATTR_TRUSTED_PREFIX) - 1;
const size_t total_len = prefix_len + name_len + 1;
if (list && total_len <= list_size) {
memcpy(list, XATTR_TRUSTED_PREFIX, prefix_len);
memcpy(list + prefix_len, name, name_len);
list[prefix_len + name_len] = '\0';
}
return total_len;
}
static int ocfs2_xattr_trusted_get(struct inode *inode, const char *name,
void *buffer, size_t size)
{
if (strcmp(name, "") == 0)
return -EINVAL;
return ocfs2_xattr_get(inode, OCFS2_XATTR_INDEX_TRUSTED, name,
buffer, size);
}
static int ocfs2_xattr_trusted_set(struct inode *inode, const char *name,
const void *value, size_t size, int flags)
{
if (strcmp(name, "") == 0)
return -EINVAL;
return ocfs2_xattr_set(inode, OCFS2_XATTR_INDEX_TRUSTED, name, value,
size, flags);
}
struct xattr_handler ocfs2_xattr_trusted_handler = {
.prefix = XATTR_TRUSTED_PREFIX,
.list = ocfs2_xattr_trusted_list,
.get = ocfs2_xattr_trusted_get,
.set = ocfs2_xattr_trusted_set,
};
/*
* 'user' attributes support
*/
#define XATTR_USER_PREFIX "user."
static size_t ocfs2_xattr_user_list(struct inode *inode, char *list,
size_t list_size, const char *name,
size_t name_len)
{
const size_t prefix_len = sizeof(XATTR_USER_PREFIX) - 1;
const size_t total_len = prefix_len + name_len + 1;
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
return 0;
if (list && total_len <= list_size) {
memcpy(list, XATTR_USER_PREFIX, prefix_len);
memcpy(list + prefix_len, name, name_len);
list[prefix_len + name_len] = '\0';
}
return total_len;
}
static int ocfs2_xattr_user_get(struct inode *inode, const char *name,
void *buffer, size_t size)
{
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
if (strcmp(name, "") == 0)
return -EINVAL;
if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
return -EOPNOTSUPP;
return ocfs2_xattr_get(inode, OCFS2_XATTR_INDEX_USER, name,
buffer, size);
}
static int ocfs2_xattr_user_set(struct inode *inode, const char *name,
const void *value, size_t size, int flags)
{
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
if (strcmp(name, "") == 0)
return -EINVAL;
if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
return -EOPNOTSUPP;
return ocfs2_xattr_set(inode, OCFS2_XATTR_INDEX_USER, name, value,
size, flags);
}
struct xattr_handler ocfs2_xattr_user_handler = {
.prefix = XATTR_USER_PREFIX,
.list = ocfs2_xattr_user_list,
.get = ocfs2_xattr_user_get,
.set = ocfs2_xattr_user_set,
};
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