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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>
#include <linux/security.h>
#define MLOG_MASK_PREFIX ML_XATTR
#include <cluster/masklog.h>
#include "ocfs2.h"
#include "alloc.h"
#include "blockcheck.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"
#include "refcounttree.h"
#include "acl.h"
struct ocfs2_xattr_def_value_root {
struct ocfs2_xattr_value_root xv;
struct ocfs2_extent_rec er;
};
struct ocfs2_xattr_bucket {
/* The inode these xattrs are associated with */
struct inode *bu_inode;
/* The actual buffers that make up the bucket */
struct buffer_head *bu_bhs[OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET];
/* How many blocks make up one bucket for this filesystem */
int bu_blocks;
};
struct ocfs2_xattr_set_ctxt {
handle_t *handle;
struct ocfs2_alloc_context *meta_ac;
struct ocfs2_alloc_context *data_ac;
struct ocfs2_cached_dealloc_ctxt dealloc;
};
#define OCFS2_XATTR_ROOT_SIZE (sizeof(struct ocfs2_xattr_def_value_root))
#define OCFS2_XATTR_INLINE_SIZE 80
#define OCFS2_XATTR_HEADER_GAP 4
#define OCFS2_XATTR_FREE_IN_IBODY (OCFS2_MIN_XATTR_INLINE_SIZE \
- sizeof(struct ocfs2_xattr_header) \
- OCFS2_XATTR_HEADER_GAP)
#define OCFS2_XATTR_FREE_IN_BLOCK(ptr) ((ptr)->i_sb->s_blocksize \
- sizeof(struct ocfs2_xattr_block) \
- sizeof(struct ocfs2_xattr_header) \
- OCFS2_XATTR_HEADER_GAP)
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,
#ifdef CONFIG_OCFS2_FS_POSIX_ACL
&ocfs2_xattr_acl_access_handler,
&ocfs2_xattr_acl_default_handler,
#endif
&ocfs2_xattr_trusted_handler,
&ocfs2_xattr_security_handler,
NULL
};
static struct xattr_handler *ocfs2_xattr_handler_map[OCFS2_XATTR_MAX] = {
[OCFS2_XATTR_INDEX_USER] = &ocfs2_xattr_user_handler,
#ifdef CONFIG_OCFS2_FS_POSIX_ACL
[OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS]
= &ocfs2_xattr_acl_access_handler,
[OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT]
= &ocfs2_xattr_acl_default_handler,
#endif
[OCFS2_XATTR_INDEX_TRUSTED] = &ocfs2_xattr_trusted_handler,
[OCFS2_XATTR_INDEX_SECURITY] = &ocfs2_xattr_security_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 super_block *sb,
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 buffer_head *blk_bh,
char *buffer,
size_t buffer_size);
static int ocfs2_xattr_create_index_block(struct inode *inode,
struct ocfs2_xattr_search *xs,
struct ocfs2_xattr_set_ctxt *ctxt);
static int ocfs2_xattr_set_entry_index_block(struct inode *inode,
struct ocfs2_xattr_info *xi,
struct ocfs2_xattr_search *xs,
struct ocfs2_xattr_set_ctxt *ctxt);
typedef int (xattr_tree_rec_func)(struct inode *inode,
struct buffer_head *root_bh,
u64 blkno, u32 cpos, u32 len, void *para);
static int ocfs2_iterate_xattr_index_block(struct inode *inode,
struct buffer_head *root_bh,
xattr_tree_rec_func *rec_func,
void *para);
static int ocfs2_delete_xattr_in_bucket(struct inode *inode,
struct ocfs2_xattr_bucket *bucket,
void *para);
static int ocfs2_rm_xattr_cluster(struct inode *inode,
struct buffer_head *root_bh,
u64 blkno,
u32 cpos,
u32 len,
void *para);
static int ocfs2_mv_xattr_buckets(struct inode *inode, handle_t *handle,
u64 src_blk, u64 last_blk, u64 to_blk,
unsigned int start_bucket,
u32 *first_hash);
static int ocfs2_prepare_refcount_xattr(struct inode *inode,
struct ocfs2_dinode *di,
struct ocfs2_xattr_info *xi,
struct ocfs2_xattr_search *xis,
struct ocfs2_xattr_search *xbs,
struct ocfs2_refcount_tree **ref_tree,
int *meta_need,
int *credits);
static int ocfs2_get_xattr_tree_value_root(struct super_block *sb,
struct ocfs2_xattr_bucket *bucket,
int offset,
struct ocfs2_xattr_value_root **xv,
struct buffer_head **bh);
static int ocfs2_xattr_security_set(struct inode *inode, const char *name,
const void *value, size_t size, int flags);
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)
#define bucket_block(_b, _n) ((_b)->bu_bhs[(_n)]->b_data)
#define bucket_xh(_b) ((struct ocfs2_xattr_header *)bucket_block((_b), 0))
static struct ocfs2_xattr_bucket *ocfs2_xattr_bucket_new(struct inode *inode)
{
struct ocfs2_xattr_bucket *bucket;
int blks = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
BUG_ON(blks > OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET);
bucket = kzalloc(sizeof(struct ocfs2_xattr_bucket), GFP_NOFS);
if (bucket) {
bucket->bu_inode = inode;
bucket->bu_blocks = blks;
}
return bucket;
}
static void ocfs2_xattr_bucket_relse(struct ocfs2_xattr_bucket *bucket)
{
int i;
for (i = 0; i < bucket->bu_blocks; i++) {
brelse(bucket->bu_bhs[i]);
bucket->bu_bhs[i] = NULL;
}
}
static void ocfs2_xattr_bucket_free(struct ocfs2_xattr_bucket *bucket)
{
if (bucket) {
ocfs2_xattr_bucket_relse(bucket);
bucket->bu_inode = NULL;
kfree(bucket);
}
}
/*
* A bucket that has never been written to disk doesn't need to be
* read. We just need the buffer_heads. Don't call this for
* buckets that are already on disk. ocfs2_read_xattr_bucket() initializes
* them fully.
*/
static int ocfs2_init_xattr_bucket(struct ocfs2_xattr_bucket *bucket,
u64 xb_blkno)
{
int i, rc = 0;
for (i = 0; i < bucket->bu_blocks; i++) {
bucket->bu_bhs[i] = sb_getblk(bucket->bu_inode->i_sb,
xb_blkno + i);
if (!bucket->bu_bhs[i]) {
rc = -EIO;
mlog_errno(rc);
break;
}
if (!ocfs2_buffer_uptodate(INODE_CACHE(bucket->bu_inode),
bucket->bu_bhs[i]))
ocfs2_set_new_buffer_uptodate(INODE_CACHE(bucket->bu_inode),
bucket->bu_bhs[i]);
}
if (rc)
ocfs2_xattr_bucket_relse(bucket);
return rc;
}
/* Read the xattr bucket at xb_blkno */
static int ocfs2_read_xattr_bucket(struct ocfs2_xattr_bucket *bucket,
u64 xb_blkno)
{
int rc;
rc = ocfs2_read_blocks(INODE_CACHE(bucket->bu_inode), xb_blkno,
bucket->bu_blocks, bucket->bu_bhs, 0,
NULL);
if (!rc) {
spin_lock(&OCFS2_SB(bucket->bu_inode->i_sb)->osb_xattr_lock);
rc = ocfs2_validate_meta_ecc_bhs(bucket->bu_inode->i_sb,
bucket->bu_bhs,
bucket->bu_blocks,
&bucket_xh(bucket)->xh_check);
spin_unlock(&OCFS2_SB(bucket->bu_inode->i_sb)->osb_xattr_lock);
if (rc)
mlog_errno(rc);
}
if (rc)
ocfs2_xattr_bucket_relse(bucket);
return rc;
}
static int ocfs2_xattr_bucket_journal_access(handle_t *handle,
struct ocfs2_xattr_bucket *bucket,
int type)
{
int i, rc = 0;
for (i = 0; i < bucket->bu_blocks; i++) {
rc = ocfs2_journal_access(handle,
INODE_CACHE(bucket->bu_inode),
bucket->bu_bhs[i], type);
if (rc) {
mlog_errno(rc);
break;
}
}
return rc;
}
static void ocfs2_xattr_bucket_journal_dirty(handle_t *handle,
struct ocfs2_xattr_bucket *bucket)
{
int i;
spin_lock(&OCFS2_SB(bucket->bu_inode->i_sb)->osb_xattr_lock);
ocfs2_compute_meta_ecc_bhs(bucket->bu_inode->i_sb,
bucket->bu_bhs, bucket->bu_blocks,
&bucket_xh(bucket)->xh_check);
spin_unlock(&OCFS2_SB(bucket->bu_inode->i_sb)->osb_xattr_lock);
for (i = 0; i < bucket->bu_blocks; i++)
ocfs2_journal_dirty(handle, bucket->bu_bhs[i]);
}
static void ocfs2_xattr_bucket_copy_data(struct ocfs2_xattr_bucket *dest,
struct ocfs2_xattr_bucket *src)
{
int i;
int blocksize = src->bu_inode->i_sb->s_blocksize;
BUG_ON(dest->bu_blocks != src->bu_blocks);
BUG_ON(dest->bu_inode != src->bu_inode);
for (i = 0; i < src->bu_blocks; i++) {
memcpy(bucket_block(dest, i), bucket_block(src, i),
blocksize);
}
}
static int ocfs2_validate_xattr_block(struct super_block *sb,
struct buffer_head *bh)
{
int rc;
struct ocfs2_xattr_block *xb =
(struct ocfs2_xattr_block *)bh->b_data;
mlog(0, "Validating xattr block %llu\n",
(unsigned long long)bh->b_blocknr);
BUG_ON(!buffer_uptodate(bh));
/*
* If the ecc fails, we return the error but otherwise
* leave the filesystem running. We know any error is
* local to this block.
*/
rc = ocfs2_validate_meta_ecc(sb, bh->b_data, &xb->xb_check);
if (rc)
return rc;
/*
* Errors after here are fatal
*/
if (!OCFS2_IS_VALID_XATTR_BLOCK(xb)) {
ocfs2_error(sb,
"Extended attribute block #%llu has bad "
"signature %.*s",
(unsigned long long)bh->b_blocknr, 7,
xb->xb_signature);
return -EINVAL;
}
if (le64_to_cpu(xb->xb_blkno) != bh->b_blocknr) {
ocfs2_error(sb,
"Extended attribute block #%llu has an "
"invalid xb_blkno of %llu",
(unsigned long long)bh->b_blocknr,
(unsigned long long)le64_to_cpu(xb->xb_blkno));
return -EINVAL;
}
if (le32_to_cpu(xb->xb_fs_generation) != OCFS2_SB(sb)->fs_generation) {
ocfs2_error(sb,
"Extended attribute block #%llu has an invalid "
"xb_fs_generation of #%u",
(unsigned long long)bh->b_blocknr,
le32_to_cpu(xb->xb_fs_generation));
return -EINVAL;
}
return 0;
}
static int ocfs2_read_xattr_block(struct inode *inode, u64 xb_blkno,
struct buffer_head **bh)
{
int rc;
struct buffer_head *tmp = *bh;
rc = ocfs2_read_block(INODE_CACHE(inode), xb_blkno, &tmp,
ocfs2_validate_xattr_block);
/* If ocfs2_read_block() got us a new bh, pass it up. */
if (!rc && !*bh)
*bh = tmp;
return rc;
}
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_entry_real_size(int name_len, size_t value_len)
{
int size = 0;
if (value_len <= OCFS2_XATTR_INLINE_SIZE)
size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_SIZE(value_len);
else
size = OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
size += sizeof(struct ocfs2_xattr_entry);
return size;
}
int ocfs2_calc_security_init(struct inode *dir,
struct ocfs2_security_xattr_info *si,
int *want_clusters,
int *xattr_credits,
struct ocfs2_alloc_context **xattr_ac)
{
int ret = 0;
struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
int s_size = ocfs2_xattr_entry_real_size(strlen(si->name),
si->value_len);
/*
* The max space of security xattr taken inline is
* 256(name) + 80(value) + 16(entry) = 352 bytes,
* So reserve one metadata block for it is ok.
*/
if (dir->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE ||
s_size > OCFS2_XATTR_FREE_IN_IBODY) {
ret = ocfs2_reserve_new_metadata_blocks(osb, 1, xattr_ac);
if (ret) {
mlog_errno(ret);
return ret;
}
*xattr_credits += OCFS2_XATTR_BLOCK_CREATE_CREDITS;
}
/* reserve clusters for xattr value which will be set in B tree*/
if (si->value_len > OCFS2_XATTR_INLINE_SIZE) {
int new_clusters = ocfs2_clusters_for_bytes(dir->i_sb,
si->value_len);
*xattr_credits += ocfs2_clusters_to_blocks(dir->i_sb,
new_clusters);
*want_clusters += new_clusters;
}
return ret;
}
int ocfs2_calc_xattr_init(struct inode *dir,
struct buffer_head *dir_bh,
int mode,
struct ocfs2_security_xattr_info *si,
int *want_clusters,
int *xattr_credits,
int *want_meta)
{
int ret = 0;
struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
int s_size = 0, a_size = 0, acl_len = 0, new_clusters;
if (si->enable)
s_size = ocfs2_xattr_entry_real_size(strlen(si->name),
si->value_len);
if (osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) {
acl_len = ocfs2_xattr_get_nolock(dir, dir_bh,
OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT,
"", NULL, 0);
if (acl_len > 0) {
a_size = ocfs2_xattr_entry_real_size(0, acl_len);
if (S_ISDIR(mode))
a_size <<= 1;
} else if (acl_len != 0 && acl_len != -ENODATA) {
mlog_errno(ret);
return ret;
}
}
if (!(s_size + a_size))
return ret;
/*
* The max space of security xattr taken inline is
* 256(name) + 80(value) + 16(entry) = 352 bytes,
* The max space of acl xattr taken inline is
* 80(value) + 16(entry) * 2(if directory) = 192 bytes,
* when blocksize = 512, may reserve one more cluser for
* xattr bucket, otherwise reserve one metadata block
* for them is ok.
* If this is a new directory with inline data,
* we choose to reserve the entire inline area for
* directory contents and force an external xattr block.
*/
if (dir->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE ||
(S_ISDIR(mode) && ocfs2_supports_inline_data(osb)) ||
(s_size + a_size) > OCFS2_XATTR_FREE_IN_IBODY) {
*want_meta = *want_meta + 1;
*xattr_credits += OCFS2_XATTR_BLOCK_CREATE_CREDITS;
}
if (dir->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE &&
(s_size + a_size) > OCFS2_XATTR_FREE_IN_BLOCK(dir)) {
*want_clusters += 1;
*xattr_credits += ocfs2_blocks_per_xattr_bucket(dir->i_sb);
}
/*
* reserve credits and clusters for xattrs which has large value
* and have to be set outside
*/
if (si->enable && si->value_len > OCFS2_XATTR_INLINE_SIZE) {
new_clusters = ocfs2_clusters_for_bytes(dir->i_sb,
si->value_len);
*xattr_credits += ocfs2_clusters_to_blocks(dir->i_sb,
new_clusters);
*want_clusters += new_clusters;
}
if (osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL &&
acl_len > OCFS2_XATTR_INLINE_SIZE) {
/* for directory, it has DEFAULT and ACCESS two types of acls */
new_clusters = (S_ISDIR(mode) ? 2 : 1) *
ocfs2_clusters_for_bytes(dir->i_sb, acl_len);
*xattr_credits += ocfs2_clusters_to_blocks(dir->i_sb,
new_clusters);
*want_clusters += new_clusters;
}
return ret;
}
static int ocfs2_xattr_extend_allocation(struct inode *inode,
u32 clusters_to_add,
struct ocfs2_xattr_value_buf *vb,
struct ocfs2_xattr_set_ctxt *ctxt)
{
int status = 0;
handle_t *handle = ctxt->handle;
enum ocfs2_alloc_restarted why;
u32 prev_clusters, logical_start = le32_to_cpu(vb->vb_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_CACHE(inode), vb);
status = vb->vb_access(handle, INODE_CACHE(inode), vb->vb_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (status < 0) {
mlog_errno(status);
goto leave;
}
prev_clusters = le32_to_cpu(vb->vb_xv->xr_clusters);
status = ocfs2_add_clusters_in_btree(handle,
&et,
&logical_start,
clusters_to_add,
0,
ctxt->data_ac,
ctxt->meta_ac,
&why);
if (status < 0) {
mlog_errno(status);
goto leave;
}
status = ocfs2_journal_dirty(handle, vb->vb_bh);
if (status < 0) {
mlog_errno(status);
goto leave;
}
clusters_to_add -= le32_to_cpu(vb->vb_xv->xr_clusters) - prev_clusters;
/*
* We should have already allocated enough space before the transaction,
* so no need to restart.
*/
BUG_ON(why != RESTART_NONE || clusters_to_add);
leave:
return status;
}
static int __ocfs2_remove_xattr_range(struct inode *inode,
struct ocfs2_xattr_value_buf *vb,
u32 cpos, u32 phys_cpos, u32 len,
unsigned int ext_flags,
struct ocfs2_xattr_set_ctxt *ctxt)
{
int ret;
u64 phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
handle_t *handle = ctxt->handle;
struct ocfs2_extent_tree et;
ocfs2_init_xattr_value_extent_tree(&et, INODE_CACHE(inode), vb);
ret = vb->vb_access(handle, INODE_CACHE(inode), vb->vb_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (ret) {
mlog_errno(ret);
goto out;
}
ret = ocfs2_remove_extent(handle, &et, cpos, len, ctxt->meta_ac,
&ctxt->dealloc);
if (ret) {
mlog_errno(ret);
goto out;
}
le32_add_cpu(&vb->vb_xv->xr_clusters, -len);
ret = ocfs2_journal_dirty(handle, vb->vb_bh);
if (ret) {
mlog_errno(ret);
goto out;
}
if (ext_flags & OCFS2_EXT_REFCOUNTED)
ret = ocfs2_decrease_refcount(inode, handle,
ocfs2_blocks_to_clusters(inode->i_sb,
phys_blkno),
len, ctxt->meta_ac, &ctxt->dealloc, 1);
else
ret = ocfs2_cache_cluster_dealloc(&ctxt->dealloc,
phys_blkno, len);
if (ret)
mlog_errno(ret);
out:
return ret;
}
static int ocfs2_xattr_shrink_size(struct inode *inode,
u32 old_clusters,
u32 new_clusters,
struct ocfs2_xattr_value_buf *vb,
struct ocfs2_xattr_set_ctxt *ctxt)
{
int ret = 0;
unsigned int ext_flags;
u32 trunc_len, cpos, phys_cpos, alloc_size;
u64 block;
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,
&vb->vb_xv->xr_list, &ext_flags);
if (ret) {
mlog_errno(ret);
goto out;
}
if (alloc_size > trunc_len)
alloc_size = trunc_len;
ret = __ocfs2_remove_xattr_range(inode, vb, cpos,
phys_cpos, alloc_size,
ext_flags, ctxt);
if (ret) {
mlog_errno(ret);
goto out;
}
block = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
ocfs2_remove_xattr_clusters_from_cache(INODE_CACHE(inode),
block, alloc_size);
cpos += alloc_size;
trunc_len -= alloc_size;
}
out:
return ret;
}
static int ocfs2_xattr_value_truncate(struct inode *inode,
struct ocfs2_xattr_value_buf *vb,
int len,
struct ocfs2_xattr_set_ctxt *ctxt)
{
int ret;
u32 new_clusters = ocfs2_clusters_for_bytes(inode->i_sb, len);
u32 old_clusters = le32_to_cpu(vb->vb_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,
vb, ctxt);
else
ret = ocfs2_xattr_shrink_size(inode,
old_clusters, new_clusters,
vb, ctxt);
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;
}
int ocfs2_has_inline_xattr_value_outside(struct inode *inode,
struct ocfs2_dinode *di)
{
struct ocfs2_xattr_header *xh;
int i;
xh = (struct ocfs2_xattr_header *)
((void *)di + inode->i_sb->s_blocksize -
le16_to_cpu(di->i_xattr_inline_size));
for (i = 0; i < le16_to_cpu(xh->xh_count); i++)
if (!ocfs2_xattr_is_local(&xh->xh_entries[i]))
return 1;
return 0;
}
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_xattr_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 (!(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
ret = ocfs2_xattr_tree_list_index_block(inode, blk_bh,
buffer, buffer_size);
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, NULL);
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_CACHE(inode), blkno,
&bh, NULL);
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, i;
int uninitialized_var(block_off);
xs->bucket = ocfs2_xattr_bucket_new(inode);
if (!xs->bucket) {
ret = -ENOMEM;
mlog_errno(ret);
goto cleanup;
}
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->i_sb,
bucket_xh(xs->bucket),
i,
&block_off,
&name_offset);
xs->base = bucket_block(xs->bucket, block_off);
}
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:
ocfs2_xattr_bucket_free(xs->bucket);
brelse(xs->xattr_bh);
xs->xattr_bh = NULL;
return ret;
}
int ocfs2_xattr_get_nolock(struct inode *inode,
struct buffer_head *di_bh,
int name_index,
const char *name,
void *buffer,
size_t buffer_size)
{
int ret;
struct ocfs2_dinode *di = 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;
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);
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 buffer_head *di_bh = NULL;
ret = ocfs2_inode_lock(inode, &di_bh, 0);
if (ret < 0) {
mlog_errno(ret);
return ret;
}
ret = ocfs2_xattr_get_nolock(inode, di_bh, name_index,
name, buffer, buffer_size);
ocfs2_inode_unlock(inode, 0);
brelse(di_bh);
return ret;
}
static int __ocfs2_xattr_set_value_outside(struct inode *inode,
handle_t *handle,
struct ocfs2_xattr_value_buf *vb,
const void *value,
int value_len)
{
int ret = 0, i, cp_len;
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;
unsigned int ext_flags;
struct ocfs2_xattr_value_root *xv = vb->vb_xv;
BUG_ON(clusters > le32_to_cpu(xv->xr_clusters));
while (cpos < clusters) {
ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
&num_clusters, &xv->xr_list,
&ext_flags);
if (ret) {
mlog_errno(ret);
goto out;
}
BUG_ON(ext_flags & OCFS2_EXT_REFCOUNTED);
blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster);
for (i = 0; i < num_clusters * bpc; i++, blkno++) {
ret = ocfs2_read_block(INODE_CACHE(inode), blkno,
&bh, NULL);
if (ret) {
mlog_errno(ret);
goto out;
}
ret = ocfs2_journal_access(handle,
INODE_CACHE(inode),
bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (ret < 0) {
mlog_errno(ret);
goto out;
}
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;
}
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:
brelse(bh);
return ret;
}
static int ocfs2_xattr_cleanup(struct inode *inode,
handle_t *handle,
struct ocfs2_xattr_info *xi,
struct ocfs2_xattr_search *xs,
struct ocfs2_xattr_value_buf *vb,
size_t offs)
{
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;
ret = vb->vb_access(handle, INODE_CACHE(inode), vb->vb_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (ret) {
mlog_errno(ret);
goto out;
}
/* 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, vb->vb_bh);
if (ret < 0)
mlog_errno(ret);
out:
return ret;
}
static int ocfs2_xattr_update_entry(struct inode *inode,
handle_t *handle,
struct ocfs2_xattr_info *xi,
struct ocfs2_xattr_search *xs,
struct ocfs2_xattr_value_buf *vb,
size_t offs)
{
int ret;
ret = vb->vb_access(handle, INODE_CACHE(inode), vb->vb_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (ret) {
mlog_errno(ret);
goto out;
}
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, vb->vb_bh);
if (ret < 0)
mlog_errno(ret);
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,
struct ocfs2_xattr_set_ctxt *ctxt,
struct ocfs2_xattr_value_buf *vb,
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;
vb->vb_xv = xv;
ret = ocfs2_xattr_value_truncate(inode, vb, xi->value_len, ctxt);
if (ret < 0) {
mlog_errno(ret);
return ret;
}
ret = ocfs2_xattr_update_entry(inode, ctxt->handle, xi, xs, vb, offs);
if (ret < 0) {
mlog_errno(ret);
return ret;
}
ret = __ocfs2_xattr_set_value_outside(inode, ctxt->handle, vb,
xi->value, xi->value_len);
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,
struct ocfs2_xattr_set_ctxt *ctxt,
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 = ctxt->handle;
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,
};
struct ocfs2_xattr_value_buf vb = {
.vb_bh = xs->xattr_bh,
.vb_access = ocfs2_journal_access_di,
};
if (!(flag & OCFS2_INLINE_XATTR_FL)) {
BUG_ON(xs->xattr_bh == xs->inode_bh);
vb.vb_access = ocfs2_journal_access_xb;
} else
BUG_ON(xs->xattr_bh != xs->inode_bh);
/* 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) - OCFS2_XATTR_HEADER_GAP;
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,
ctxt, &vb, offs);
if (ret < 0)
mlog_errno(ret);
goto out;
} else if (!ocfs2_xattr_is_local(xs->here)) {
/* For existing xattr which has value outside */
vb.vb_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,
&vb,
xi->value_len,
ctxt);
if (ret < 0) {
mlog_errno(ret);
goto out;
}
ret = ocfs2_xattr_update_entry(inode,
handle,
xi,
xs,
&vb,
offs);
if (ret < 0) {
mlog_errno(ret);
goto out;
}
ret = __ocfs2_xattr_set_value_outside(inode,
handle,
&vb,
xi->value,
xi->value_len);
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,
&vb,
0,
ctxt);
if (ret < 0)
mlog_errno(ret);
}
}
}
ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), xs->inode_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (ret) {
mlog_errno(ret);
goto out;
}
if (!(flag & OCFS2_INLINE_XATTR_FL)) {
ret = vb.vb_access(handle, INODE_CACHE(inode), vb.vb_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (ret) {
mlog_errno(ret);
goto out;
}
}
/*
* 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;
}
}
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);
ret = ocfs2_journal_dirty(handle, xs->inode_bh);
if (ret < 0)
mlog_errno(ret);
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, ctxt,
&vb, 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, ctxt->handle,
xi, xs, &vb, offs);
if (ret2 < 0)
mlog_errno(ret2);
}
}
out:
return ret;
}
/*
* In xattr remove, if it is stored outside and refcounted, we may have
* the chance to split the refcount tree. So need the allocators.
*/
static int ocfs2_lock_xattr_remove_allocators(struct inode *inode,
struct ocfs2_xattr_value_root *xv,
struct ocfs2_caching_info *ref_ci,
struct buffer_head *ref_root_bh,
struct ocfs2_alloc_context **meta_ac,
int *ref_credits)
{
int ret, meta_add = 0;
u32 p_cluster, num_clusters;
unsigned int ext_flags;
*ref_credits = 0;
ret = ocfs2_xattr_get_clusters(inode, 0, &p_cluster,
&num_clusters,
&xv->xr_list,
&ext_flags);
if (ret) {
mlog_errno(ret);
goto out;
}
if (!(ext_flags & OCFS2_EXT_REFCOUNTED))
goto out;
ret = ocfs2_refcounted_xattr_delete_need(inode, ref_ci,
ref_root_bh, xv,
&meta_add, ref_credits);
if (ret) {
mlog_errno(ret);
goto out;
}
ret = ocfs2_reserve_new_metadata_blocks(OCFS2_SB(inode->i_sb),
meta_add, meta_ac);
if (ret)
mlog_errno(ret);
out:
return ret;
}
static int ocfs2_remove_value_outside(struct inode*inode,
struct ocfs2_xattr_value_buf *vb,
struct ocfs2_xattr_header *header,
struct ocfs2_caching_info *ref_ci,
struct buffer_head *ref_root_bh)
{
int ret = 0, i, ref_credits;
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
struct ocfs2_xattr_set_ctxt ctxt = { NULL, NULL, };
void *val;
ocfs2_init_dealloc_ctxt(&ctxt.dealloc);
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))
continue;
val = (void *)header +
le16_to_cpu(entry->xe_name_offset);
vb->vb_xv = (struct ocfs2_xattr_value_root *)
(val + OCFS2_XATTR_SIZE(entry->xe_name_len));
ret = ocfs2_lock_xattr_remove_allocators(inode, vb->vb_xv,
ref_ci, ref_root_bh,
&ctxt.meta_ac,
&ref_credits);
ctxt.handle = ocfs2_start_trans(osb, ref_credits +
ocfs2_remove_extent_credits(osb->sb));
if (IS_ERR(ctxt.handle)) {
ret = PTR_ERR(ctxt.handle);
mlog_errno(ret);
break;
}
ret = ocfs2_xattr_value_truncate(inode, vb, 0, &ctxt);
if (ret < 0) {
mlog_errno(ret);
break;
}
ocfs2_commit_trans(osb, ctxt.handle);
if (ctxt.meta_ac) {
ocfs2_free_alloc_context(ctxt.meta_ac);
ctxt.meta_ac = NULL;
}
}
if (ctxt.meta_ac)
ocfs2_free_alloc_context(ctxt.meta_ac);
ocfs2_schedule_truncate_log_flush(osb, 1);
ocfs2_run_deallocs(osb, &ctxt.dealloc);
return ret;
}
static int ocfs2_xattr_ibody_remove(struct inode *inode,
struct buffer_head *di_bh,
struct ocfs2_caching_info *ref_ci,
struct buffer_head *ref_root_bh)
{
struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
struct ocfs2_xattr_header *header;
int ret;
struct ocfs2_xattr_value_buf vb = {
.vb_bh = di_bh,
.vb_access = ocfs2_journal_access_di,
};
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, &vb, header,
ref_ci, ref_root_bh);
return ret;
}
struct ocfs2_rm_xattr_bucket_para {
struct ocfs2_caching_info *ref_ci;
struct buffer_head *ref_root_bh;
};
static int ocfs2_xattr_block_remove(struct inode *inode,
struct buffer_head *blk_bh,
struct ocfs2_caching_info *ref_ci,
struct buffer_head *ref_root_bh)
{
struct ocfs2_xattr_block *xb;
int ret = 0;
struct ocfs2_xattr_value_buf vb = {
.vb_bh = blk_bh,
.vb_access = ocfs2_journal_access_xb,
};
struct ocfs2_rm_xattr_bucket_para args = {
.ref_ci = ref_ci,
.ref_root_bh = ref_root_bh,
};
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, &vb, header,
ref_ci, ref_root_bh);
} else
ret = ocfs2_iterate_xattr_index_block(inode,
blk_bh,
ocfs2_rm_xattr_cluster,
&args);
return ret;
}
static int ocfs2_xattr_free_block(struct inode *inode,
u64 block,
struct ocfs2_caching_info *ref_ci,
struct buffer_head *ref_root_bh)
{
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_xattr_block(inode, block, &blk_bh);
if (ret < 0) {
mlog_errno(ret);
goto out;
}
ret = ocfs2_xattr_block_remove(inode, blk_bh, ref_ci, ref_root_bh);
if (ret < 0) {
mlog_errno(ret);
goto out;
}
xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
blk = le64_to_cpu(xb->xb_blkno);
bit = le16_to_cpu(xb->xb_suballoc_bit);
bg_blkno = ocfs2_which_suballoc_group(blk, bit);
xb_alloc_inode = ocfs2_get_system_file_inode(osb,
EXTENT_ALLOC_SYSTEM_INODE,
le16_to_cpu(xb->xb_suballoc_slot));
if (!xb_alloc_inode) {
ret = -ENOMEM;
mlog_errno(ret);
goto out;
}
mutex_lock(&xb_alloc_inode->i_mutex);
ret = ocfs2_inode_lock(xb_alloc_inode, &xb_alloc_bh, 1);
if (ret < 0) {
mlog_errno(ret);
goto out_mutex;
}
handle = ocfs2_start_trans(osb, OCFS2_SUBALLOC_FREE);
if (IS_ERR(handle)) {
ret = PTR_ERR(handle);
mlog_errno(ret);
goto out_unlock;
}
ret = ocfs2_free_suballoc_bits(handle, xb_alloc_inode, xb_alloc_bh,
bit, bg_blkno, 1);
if (ret < 0)
mlog_errno(ret);
ocfs2_commit_trans(osb, handle);
out_unlock:
ocfs2_inode_unlock(xb_alloc_inode, 1);
brelse(xb_alloc_bh);
out_mutex:
mutex_unlock(&xb_alloc_inode->i_mutex);
iput(xb_alloc_inode);
out:
brelse(blk_bh);
return ret;
}
/*
* ocfs2_xattr_remove()
*
* Free extended attribute resources associated with this inode.
*/
int ocfs2_xattr_remove(struct inode *inode, struct buffer_head *di_bh)
{
struct ocfs2_inode_info *oi = OCFS2_I(inode);
struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
struct ocfs2_refcount_tree *ref_tree = NULL;
struct buffer_head *ref_root_bh = NULL;
struct ocfs2_caching_info *ref_ci = NULL;
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 (OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL) {
ret = ocfs2_lock_refcount_tree(OCFS2_SB(inode->i_sb),
le64_to_cpu(di->i_refcount_loc),
1, &ref_tree, &ref_root_bh);
if (ret) {
mlog_errno(ret);
goto out;
}
ref_ci = &ref_tree->rf_ci;
}
if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
ret = ocfs2_xattr_ibody_remove(inode, di_bh,
ref_ci, ref_root_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),
ref_ci, ref_root_bh);
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_di(handle, INODE_CACHE(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:
if (ref_tree)
ocfs2_unlock_refcount_tree(OCFS2_SB(inode->i_sb), ref_tree, 1);
brelse(ref_root_bh);
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_xattr_set_ctxt *ctxt)
{
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, ctxt,
(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_xattr_block(inode, le64_to_cpu(di->i_xattr_loc),
&blk_bh);
if (ret < 0) {
mlog_errno(ret);
return ret;
}
xs->xattr_bh = blk_bh;
xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
xs->header = &xb->xb_attrs.xb_header;
xs->base = (void *)xs->header;
xs->end = (void *)(blk_bh->b_data) + blk_bh->b_size;
xs->here = xs->header->xh_entries;
ret = ocfs2_xattr_find_entry(name_index, name, xs);
} else
ret = ocfs2_xattr_index_block_find(inode, blk_bh,
name_index,
name, xs);
if (ret && ret != -ENODATA) {
xs->xattr_bh = NULL;
goto cleanup;
}
xs->not_found = ret;
return 0;
cleanup:
brelse(blk_bh);
return ret;
}
static int ocfs2_create_xattr_block(handle_t *handle,
struct inode *inode,
struct buffer_head *inode_bh,
struct ocfs2_alloc_context *meta_ac,
struct buffer_head **ret_bh,
int indexed)
{
int ret;
u16 suballoc_bit_start;
u32 num_got;
u64 first_blkno;
struct ocfs2_dinode *di = (struct ocfs2_dinode *)inode_bh->b_data;
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
struct buffer_head *new_bh = NULL;
struct ocfs2_xattr_block *xblk;
ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), inode_bh,
OCFS2_JOURNAL_ACCESS_CREATE);
if (ret < 0) {
mlog_errno(ret);
goto end;
}
ret = ocfs2_claim_metadata(osb, handle, meta_ac, 1,
&suballoc_bit_start, &num_got,
&first_blkno);
if (ret < 0) {
mlog_errno(ret);
goto end;
}
new_bh = sb_getblk(inode->i_sb, first_blkno);
ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode), new_bh);
ret = ocfs2_journal_access_xb(handle, INODE_CACHE(inode),
new_bh,
OCFS2_JOURNAL_ACCESS_CREATE);
if (ret < 0) {
mlog_errno(ret);
goto end;
}
/* Initialize ocfs2_xattr_block */
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);
if (indexed) {
struct ocfs2_xattr_tree_root *xr = &xblk->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);
xblk->xb_flags = cpu_to_le16(OCFS2_XATTR_INDEXED);
}
ret = ocfs2_journal_dirty(handle, new_bh);
if (ret < 0) {
mlog_errno(ret);
goto end;
}
di->i_xattr_loc = cpu_to_le64(first_blkno);
ocfs2_journal_dirty(handle, inode_bh);
*ret_bh = new_bh;
new_bh = NULL;
end:
brelse(new_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 ocfs2_xattr_set_ctxt *ctxt)
{
struct buffer_head *new_bh = NULL;
handle_t *handle = ctxt->handle;
struct ocfs2_xattr_block *xblk = NULL;
int ret;
if (!xs->xattr_bh) {
ret = ocfs2_create_xattr_block(handle, inode, xs->inode_bh,
ctxt->meta_ac, &new_bh, 0);
if (ret) {
mlog_errno(ret);
goto end;
}
xs->xattr_bh = new_bh;
xblk = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
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;
} 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, ctxt,
OCFS2_HAS_XATTR_FL);
if (!ret || ret != -ENOSPC)
goto end;
ret = ocfs2_xattr_create_index_block(inode, xs, ctxt);
if (ret)
goto end;
}
ret = ocfs2_xattr_set_entry_index_block(inode, xi, xs, ctxt);
end:
return ret;
}
/* Check whether the new xattr can be inserted into the inode. */
static int ocfs2_xattr_can_be_in_inode(struct inode *inode,
struct ocfs2_xattr_info *xi,
struct ocfs2_xattr_search *xs)
{
u64 value_size;
struct ocfs2_xattr_entry *last;
int free, i;
size_t min_offs = xs->end - xs->base;
if (!xs->header)
return 0;
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) - OCFS2_XATTR_HEADER_GAP;
if (free < 0)
return 0;
BUG_ON(!xs->not_found);
if (xi->value_len > OCFS2_XATTR_INLINE_SIZE)
value_size = OCFS2_XATTR_ROOT_SIZE;
else
value_size = OCFS2_XATTR_SIZE(xi->value_len);
if (free >= sizeof(struct ocfs2_xattr_entry) +
OCFS2_XATTR_SIZE(strlen(xi->name)) + value_size)
return 1;
return 0;
}
static int ocfs2_calc_xattr_set_need(struct inode *inode,
struct ocfs2_dinode *di,
struct ocfs2_xattr_info *xi,
struct ocfs2_xattr_search *xis,
struct ocfs2_xattr_search *xbs,
int *clusters_need,
int *meta_need,
int *credits_need)
{
int ret = 0, old_in_xb = 0;
int clusters_add = 0, meta_add = 0, credits = 0;
struct buffer_head *bh = NULL;
struct ocfs2_xattr_block *xb = NULL;
struct ocfs2_xattr_entry *xe = NULL;
struct ocfs2_xattr_value_root *xv = NULL;
char *base = NULL;
int name_offset, name_len = 0;
u32 new_clusters = ocfs2_clusters_for_bytes(inode->i_sb,
xi->value_len);
u64 value_size;
/*
* Calculate the clusters we need to write.
* No matter whether we replace an old one or add a new one,
* we need this for writing.
*/
if (xi->value_len > OCFS2_XATTR_INLINE_SIZE)
credits += new_clusters *
ocfs2_clusters_to_blocks(inode->i_sb, 1);
if (xis->not_found && xbs->not_found) {
credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
if (xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
clusters_add += new_clusters;
credits += ocfs2_calc_extend_credits(inode->i_sb,
&def_xv.xv.xr_list,
new_clusters);
}
goto meta_guess;
}
if (!xis->not_found) {
xe = xis->here;
name_offset = le16_to_cpu(xe->xe_name_offset);
name_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
base = xis->base;
credits += OCFS2_INODE_UPDATE_CREDITS;
} else {
int i, block_off = 0;
xb = (struct ocfs2_xattr_block *)xbs->xattr_bh->b_data;
xe = xbs->here;
name_offset = le16_to_cpu(xe->xe_name_offset);
name_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
i = xbs->here - xbs->header->xh_entries;
old_in_xb = 1;
if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
bucket_xh(xbs->bucket),
i, &block_off,
&name_offset);
base = bucket_block(xbs->bucket, block_off);
credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
} else {
base = xbs->base;
credits += OCFS2_XATTR_BLOCK_UPDATE_CREDITS;
}
}
/*
* delete a xattr doesn't need metadata and cluster allocation.
* so just calculate the credits and return.
*
* The credits for removing the value tree will be extended
* by ocfs2_remove_extent itself.
*/
if (!xi->value) {
if (!ocfs2_xattr_is_local(xe))
credits += ocfs2_remove_extent_credits(inode->i_sb);
goto out;
}
/* do cluster allocation guess first. */
value_size = le64_to_cpu(xe->xe_value_size);
if (old_in_xb) {
/*
* In xattr set, we always try to set the xe in inode first,
* so if it can be inserted into inode successfully, the old
* one will be removed from the xattr block, and this xattr
* will be inserted into inode as a new xattr in inode.
*/
if (ocfs2_xattr_can_be_in_inode(inode, xi, xis)) {
clusters_add += new_clusters;
credits += ocfs2_remove_extent_credits(inode->i_sb) +
OCFS2_INODE_UPDATE_CREDITS;
if (!ocfs2_xattr_is_local(xe))
credits += ocfs2_calc_extend_credits(
inode->i_sb,
&def_xv.xv.xr_list,
new_clusters);
goto out;
}
}
if (xi->value_len > OCFS2_XATTR_INLINE_SIZE) {
/* the new values will be stored outside. */
u32 old_clusters = 0;
if (!ocfs2_xattr_is_local(xe)) {
old_clusters = ocfs2_clusters_for_bytes(inode->i_sb,
value_size);
xv = (struct ocfs2_xattr_value_root *)
(base + name_offset + name_len);
value_size = OCFS2_XATTR_ROOT_SIZE;
} else
xv = &def_xv.xv;
if (old_clusters >= new_clusters) {
credits += ocfs2_remove_extent_credits(inode->i_sb);
goto out;
} else {
meta_add += ocfs2_extend_meta_needed(&xv->xr_list);
clusters_add += new_clusters - old_clusters;
credits += ocfs2_calc_extend_credits(inode->i_sb,
&xv->xr_list,
new_clusters -
old_clusters);
if (value_size >= OCFS2_XATTR_ROOT_SIZE)
goto out;
}
} else {
/*
* Now the new value will be stored inside. So if the new
* value is smaller than the size of value root or the old
* value, we don't need any allocation, otherwise we have
* to guess metadata allocation.
*/
if ((ocfs2_xattr_is_local(xe) && value_size >= xi->value_len) ||
(!ocfs2_xattr_is_local(xe) &&
OCFS2_XATTR_ROOT_SIZE >= xi->value_len))
goto out;
}
meta_guess:
/* calculate metadata allocation. */
if (di->i_xattr_loc) {
if (!xbs->xattr_bh) {
ret = ocfs2_read_xattr_block(inode,
le64_to_cpu(di->i_xattr_loc),
&bh);
if (ret) {
mlog_errno(ret);
goto out;
}
xb = (struct ocfs2_xattr_block *)bh->b_data;
} else
xb = (struct ocfs2_xattr_block *)xbs->xattr_bh->b_data;
/*
* If there is already an xattr tree, good, we can calculate
* like other b-trees. Otherwise we may have the chance of
* create a tree, the credit calculation is borrowed from
* ocfs2_calc_extend_credits with root_el = NULL. And the
* new tree will be cluster based, so no meta is needed.
*/
if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
struct ocfs2_extent_list *el =
&xb->xb_attrs.xb_root.xt_list;
meta_add += ocfs2_extend_meta_needed(el);
credits += ocfs2_calc_extend_credits(inode->i_sb,
el, 1);
} else
credits += OCFS2_SUBALLOC_ALLOC + 1;
/*
* This cluster will be used either for new bucket or for
* new xattr block.
* If the cluster size is the same as the bucket size, one
* more is needed since we may need to extend the bucket
* also.
*/
clusters_add += 1;
credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
if (OCFS2_XATTR_BUCKET_SIZE ==
OCFS2_SB(inode->i_sb)->s_clustersize) {
credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
clusters_add += 1;
}
} else {
meta_add += 1;
credits += OCFS2_XATTR_BLOCK_CREATE_CREDITS;
}
out:
if (clusters_need)
*clusters_need = clusters_add;
if (meta_need)
*meta_need = meta_add;
if (credits_need)
*credits_need = credits;
brelse(bh);
return ret;
}
static int ocfs2_init_xattr_set_ctxt(struct inode *inode,
struct ocfs2_dinode *di,
struct ocfs2_xattr_info *xi,
struct ocfs2_xattr_search *xis,
struct ocfs2_xattr_search *xbs,
struct ocfs2_xattr_set_ctxt *ctxt,
int extra_meta,
int *credits)
{
int clusters_add, meta_add, ret;
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
memset(ctxt, 0, sizeof(struct ocfs2_xattr_set_ctxt));
ocfs2_init_dealloc_ctxt(&ctxt->dealloc);
ret = ocfs2_calc_xattr_set_need(inode, di, xi, xis, xbs,
&clusters_add, &meta_add, credits);
if (ret) {
mlog_errno(ret);
return ret;
}
meta_add += extra_meta;
mlog(0, "Set xattr %s, reserve meta blocks = %d, clusters = %d, "
"credits = %d\n", xi->name, meta_add, clusters_add, *credits);
if (meta_add) {
ret = ocfs2_reserve_new_metadata_blocks(osb, meta_add,
&ctxt->meta_ac);
if (ret) {
mlog_errno(ret);
goto out;
}
}
if (clusters_add) {
ret = ocfs2_reserve_clusters(osb, clusters_add, &ctxt->data_ac);
if (ret)
mlog_errno(ret);
}
out:
if (ret) {
if (ctxt->meta_ac) {
ocfs2_free_alloc_context(ctxt->meta_ac);
ctxt->meta_ac = NULL;
}
/*
* We cannot have an error and a non null ctxt->data_ac.
*/
}
return ret;
}
static int __ocfs2_xattr_set_handle(struct inode *inode,
struct ocfs2_dinode *di,
struct ocfs2_xattr_info *xi,
struct ocfs2_xattr_search *xis,
struct ocfs2_xattr_search *xbs,
struct ocfs2_xattr_set_ctxt *ctxt)
{
int ret = 0, credits, old_found;
if (!xi->value) {
/* Remove existing extended attribute */
if (!xis->not_found)
ret = ocfs2_xattr_ibody_set(inode, xi, xis, ctxt);
else if (!xbs->not_found)
ret = ocfs2_xattr_block_set(inode, xi, xbs, ctxt);
} else {
/* We always try to set extended attribute into inode first*/
ret = ocfs2_xattr_ibody_set(inode, xi, xis, ctxt);
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;
old_found = xis->not_found;
xis->not_found = -ENODATA;
ret = ocfs2_calc_xattr_set_need(inode,
di,
xi,
xis,
xbs,
NULL,
NULL,
&credits);
xis->not_found = old_found;
if (ret) {
mlog_errno(ret);
goto out;
}