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linux/fs/ocfs2/xattr.c
Joel Becker 9c7759aa67 ocfs2: Convenient access to an xattr bucket's block number. 
The xattr code often wants to know the block number of an xattr bucket.
This is usually found by dereferencing the first bh hanging off of the
ocfs2_xattr_bucket structure.  Rather than do this all the time, let's
provide a nice little macro.  The idea is ripped from the ocfs2_path
code.

Signed-off-by: Joel Becker <joel.becker@oracle.com>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>
2009-01-05 08:34:16 -08:00

4871 lines
122 KiB
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/* -*- mode: c; c-basic-offset: 8; -*-
* vim: noexpandtab sw=8 ts=8 sts=0:
*
* xattr.c
*
* Copyright (C) 2004, 2008 Oracle. All rights reserved.
*
* CREDITS:
* Lots of code in this file is copy from linux/fs/ext3/xattr.c.
* Copyright (C) 2001-2003 Andreas Gruenbacher, <agruen@suse.de>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License version 2 as published by the Free Software Foundation.
*
* 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.
*/
#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 *bu_bhs[OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET];
struct ocfs2_xattr_header *bu_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_MAX] = {
[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_block_find(struct inode *inode,
int name_index,
const char *name,
struct ocfs2_xattr_search *xs);
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 u16 ocfs2_xattr_buckets_per_cluster(struct ocfs2_super *osb)
{
return (1 << osb->s_clustersize_bits) / OCFS2_XATTR_BUCKET_SIZE;
}
static inline u16 ocfs2_blocks_per_xattr_bucket(struct super_block *sb)
{
return OCFS2_XATTR_BUCKET_SIZE / (1 << sb->s_blocksize_bits);
}
static inline u16 ocfs2_xattr_max_xe_in_bucket(struct super_block *sb)
{
u16 len = sb->s_blocksize -
offsetof(struct ocfs2_xattr_header, xh_entries);
return len / sizeof(struct ocfs2_xattr_entry);
}
#define bucket_blkno(_b) ((_b)->bu_bhs[0]->b_blocknr)
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;
}
xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
if (!OCFS2_IS_VALID_XATTR_BLOCK(xb)) {
ret = -EIO;
goto cleanup;
}
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_xattr_block *xb;
struct ocfs2_xattr_value_root *xv;
size_t size;
int ret = -ENODATA, name_offset, name_len, block_off, i;
memset(&xs->bucket, 0, sizeof(xs->bucket));
ret = ocfs2_xattr_block_find(inode, name_index, name, xs);
if (ret) {
mlog_errno(ret);
goto cleanup;
}
if (xs->not_found) {
ret = -ENODATA;
goto cleanup;
}
xb = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
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.bu_xh,
i,
&block_off,
&name_offset);
xs->base = xs->bucket.bu_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.bu_bhs[i]);
memset(&xs->bucket, 0, sizeof(xs->bucket));
brelse(xs->xattr_bh);
xs->xattr_bh = NULL;
return ret;
}
/* ocfs2_xattr_get()
*
* Copy an extended attribute into the buffer provided.
* Buffer is NULL to compute the size of buffer required.
*/
static 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 && di->i_xattr_loc)
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 -EIO;
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;
}
xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
if (!OCFS2_IS_VALID_XATTR_BLOCK(xb)) {
ret = -EIO;
goto out;
}
ret = ocfs2_xattr_block_remove(inode, blk_bh);
if (ret < 0) {
mlog_errno(ret);
goto out;
}
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;
}
xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
if (!OCFS2_IS_VALID_XATTR_BLOCK(xb)) {
ret = -EIO;
goto cleanup;
}
xs->xattr_bh = blk_bh;
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;
}
/*
* 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);
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.bu_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.bu_bhs[0] = lower_bh;
xs->bucket.bu_xh = (struct ocfs2_xattr_header *)
xs->bucket.bu_bhs[0]->b_data;
lower_bh = NULL;
xs->header = xs->bucket.bu_xh;
xs->base = xs->bucket.bu_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, bucket_blkno(&xs->bucket) + 1,
blk_per_bucket - 1, &xs->bucket.bu_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)bucket_blkno(&xs->bucket), 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, (unsigned long long)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, (unsigned long long)blkno);
for (i = 0; i < num_buckets; i++, blkno += blk_per_bucket) {
ret = ocfs2_read_blocks(inode, blkno, blk_per_bucket,
bucket.bu_bhs, 0);
if (ret) {
mlog_errno(ret);
goto out;
}
bucket.bu_xh = (struct ocfs2_xattr_header *)bucket.bu_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.bu_xh->xh_num_buckets);
mlog(0, "iterating xattr bucket %llu, first hash %u\n",
(unsigned long long)blkno,
le32_to_cpu(bucket.bu_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.bu_bhs[j]);
memset(&bucket, 0, sizeof(bucket));
}
out:
for (j = 0; j < blk_per_bucket; j++)
brelse(bucket.bu_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->bu_xh->xh_count); i++) {
struct ocfs2_xattr_entry *entry = &bucket->bu_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->bu_xh,
i,
&block_off,
&new_offset);
if (ret)
break;
name = (const char *)bucket->bu_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.bu_bhs[0] = new_bh;
get_bh(new_bh);
xs->bucket.bu_xh = (struct ocfs2_xattr_header *)xs->bucket.bu_bhs[0]->b_data;
xs->header = xs->bucket.bu_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,
bucket_blkno(&xs->bucket) + 1,
blk_per_bucket - 1, &xs->bucket.bu_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",
(unsigned long long)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);
ret = ocfs2_xattr_update_xattr_search(inode, xs, xb_bh, xh_bh);
if (ret) {
mlog_errno(ret);
goto out_commit;
}
/* 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_blkno(bucket);
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",
(unsigned long long)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",
(unsigned long long)prev_blkno, (unsigned long long)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;
}
/*
* Find the suitable pos when we divide a bucket into 2.
* We have to make sure the xattrs with the same hash value exist
* in the same bucket.
*
* If this ocfs2_xattr_header covers more than one hash value, find a
* place where the hash value changes. Try to find the most even split.
* The most common case is that all entries have different hash values,
* and the first check we make will find a place to split.
*/
static int ocfs2_xattr_find_divide_pos(struct ocfs2_xattr_header *xh)
{
struct ocfs2_xattr_entry *entries = xh->xh_entries;
int count = le16_to_cpu(xh->xh_count);
int delta, middle = count / 2;
/*
* We start at the middle. Each step gets farther away in both
* directions. We therefore hit the change in hash value
* nearest to the middle. Note that this loop does not execute for
* count < 2.
*/
for (delta = 0; delta < middle; delta++) {
/* Let's check delta earlier than middle */
if (cmp_xe(&entries[middle - delta - 1],
&entries[middle - delta]))
return middle - delta;
/* For even counts, don't walk off the end */
if ((middle + delta + 1) == count)
continue;
/* Now try delta past middle */
if (cmp_xe(&entries[middle + delta],
&entries[middle + delta + 1]))
return middle + delta + 1;
}
/* Every entry had the same hash */
return count;
}
/*
* Move some xattrs in old bucket(blk) to new bucket(new_blk).
* first_hash will record the 1st hash of the new bucket.
*
* Normally half of the xattrs will be moved. But we have to make
* sure that the xattrs with the same hash value are stored in the
* same bucket. If all the xattrs in this bucket have the same hash
* value, the new bucket will be initialized as an empty one and the
* first_hash will be initialized as (hash_value+1).
*/
static int ocfs2_divide_xattr_bucket(struct inode *inode,
handle_t *handle,
u64 blk,
u64 new_blk,
u32 *first_hash,
int new_bucket_head)
{
int ret, i;
int count, start, len, name_value_len = 0, xe_len, name_offset = 0;
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 some of xattrs from bucket %llu to %llu\n",
(unsigned long long)blk, (unsigned long long)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],
new_bucket_head ?
OCFS2_JOURNAL_ACCESS_CREATE :
OCFS2_JOURNAL_ACCESS_WRITE);
if (ret) {
mlog_errno(ret);
goto out;
}
}
xh = (struct ocfs2_xattr_header *)s_bhs[0]->b_data;
count = le16_to_cpu(xh->xh_count);
start = ocfs2_xattr_find_divide_pos(xh);
if (start == count) {
xe = &xh->xh_entries[start-1];
/*
* initialized a new empty bucket here.
* The hash value is set as one larger than
* that of the last entry in the previous bucket.
*/
for (i = 0; i < blk_per_bucket; i++)
memset(t_bhs[i]->b_data, 0, blocksize);
xh = (struct ocfs2_xattr_header *)t_bhs[0]->b_data;
xh->xh_free_start = cpu_to_le16(blocksize);
xh->xh_entries[0].xe_name_hash = xe->xe_name_hash;
le32_add_cpu(&xh->xh_entries[0].xe_name_hash, 1);
goto set_num_buckets;
}
/* 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;
/*
* 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_num_buckets:
/* 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. If we
* just added a new empty bucket, there is no need to modify
* it.
*/
if (start == count)
goto out;
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",
(unsigned long long)s_blkno, (unsigned long long)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],
t_is_new ?
OCFS2_JOURNAL_ACCESS_CREATE :
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",
(unsigned long long)src_blk, (unsigned long long)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 some 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_divide_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_divide_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",
(unsigned long long)prev_blk, prev_clusters,
(unsigned long long)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_divide_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, (unsigned long long)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, (unsigned long long)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", (unsigned long long)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_divide_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->bu_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)bucket_blkno(&xs->bucket));
if (!xs->bucket.bu_bhs[1]) {
ret = ocfs2_read_blocks(inode,
bucket_blkno(&xs->bucket) + 1,
blk_per_bucket - 1, &xs->bucket.bu_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.bu_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.bu_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 (IS_ERR(handle)) {
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.bu_bhs[0] || !xe || ocfs2_xattr_is_local(xe));
offset = xe - xh->xh_entries;
ret = ocfs2_xattr_bucket_value_truncate(inode, xs->bucket.bu_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 (IS_ERR(handle)) {
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.bu_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.bu_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.bu_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.
* If we want to insert the xattr with the same hash, return -ENOSPC.
* If we want to insert a xattr with different hash value, go ahead
* and ocfs2_divide_xattr_bucket will handle this.
*/
static int ocfs2_check_xattr_bucket_collision(struct inode *inode,
struct ocfs2_xattr_bucket *bucket,
const char *name)
{
struct ocfs2_xattr_header *xh = bucket->bu_xh;
u32 name_hash = ocfs2_xattr_name_hash(inode, name, strlen(name));
if (name_hash != le32_to_cpu(xh->xh_entries[0].xe_name_hash))
return 0;
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_blkno(bucket),
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)bucket_blkno(&xs->bucket),
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)bucket_blkno(&xs->bucket),
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,
xi->name);
if (ret) {
mlog_errno(ret);
goto out;
}
ret = ocfs2_add_new_xattr_bucket(inode,
xs->xattr_bh,
xs->bucket.bu_bhs[0]);
if (ret) {
mlog_errno(ret);
goto out;
}
for (i = 0; i < blk_per_bucket; i++)
brelse(xs->bucket.bu_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->bu_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->bu_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
*/
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 = XATTR_TRUSTED_PREFIX_LEN;
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
*/
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 = XATTR_USER_PREFIX_LEN;
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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