C++ ERR_PTR函数代码示例

static struct apq8016_sbc_data *apq8016_sbc_parse_of(struct snd_soc_card *card)
{
	struct device *dev = card->dev;
	struct snd_soc_dai_link *link;
	struct device_node *np, *codec, *cpu, *node  = dev->of_node;
	struct apq8016_sbc_data *data;
	int ret, num_links;

	ret = snd_soc_of_parse_card_name(card, "qcom,model");
	if (ret) {
		dev_err(dev, "Error parsing card name: %d\n", ret);
		return ERR_PTR(ret);
	}

	/* DAPM routes */
	if (of_property_read_bool(node, "qcom,audio-routing")) {
		ret = snd_soc_of_parse_audio_routing(card,
					"qcom,audio-routing");
		if (ret)
			return ERR_PTR(ret);
	}


	/* Populate links */
	num_links = of_get_child_count(node);

	/* Allocate the private data and the DAI link array */
	data = devm_kzalloc(dev, sizeof(*data) + sizeof(*link) * num_links,
			    GFP_KERNEL);
	if (!data)
		return ERR_PTR(-ENOMEM);

	card->dai_link	= &data->dai_link[0];
	card->num_links	= num_links;

	link = data->dai_link;

	for_each_child_of_node(node, np) {
		cpu = of_get_child_by_name(np, "cpu");
		codec = of_get_child_by_name(np, "codec");

		if (!cpu || !codec) {
			dev_err(dev, "Can't find cpu/codec DT node\n");
			return ERR_PTR(-EINVAL);
		}

		link->cpu_of_node = of_parse_phandle(cpu, "sound-dai", 0);
		if (!link->cpu_of_node) {
			dev_err(card->dev, "error getting cpu phandle\n");
			return ERR_PTR(-EINVAL);
		}

		ret = snd_soc_of_get_dai_name(cpu, &link->cpu_dai_name);
		if (ret) {
			dev_err(card->dev, "error getting cpu dai name\n");
			return ERR_PTR(ret);
		}

		ret = snd_soc_of_get_dai_link_codecs(dev, codec, link);

		if (ret < 0) {
			dev_err(card->dev, "error getting codec dai name\n");
			return ERR_PTR(ret);
		}

		link->platform_of_node = link->cpu_of_node;
		ret = of_property_read_string(np, "link-name", &link->name);
		if (ret) {
			dev_err(card->dev, "error getting codec dai_link name\n");
			return ERR_PTR(ret);
		}

		link->stream_name = link->name;
		link->init = apq8016_sbc_dai_init;
		link++;
	}

struct page *init_inode_metadata(struct inode *inode, struct inode *dir,
			const struct qstr *name, struct page *dpage)
{
	struct page *page;
	int err;

	if (is_inode_flag_set(F2FS_I(inode), FI_NEW_INODE)) {
		page = new_inode_page(inode);
		if (IS_ERR(page))
			return page;

		if (S_ISDIR(inode->i_mode)) {
			err = make_empty_dir(inode, dir, page);
			if (err)
				goto error;
		}

		err = f2fs_init_acl(inode, dir, page, dpage);
		if (err)
			goto put_error;

		err = f2fs_init_security(inode, dir, name, page);
		if (err)
			goto put_error;
	} else {
		page = get_node_page(F2FS_I_SB(dir), inode->i_ino);
		if (IS_ERR(page))
			return page;

		set_cold_node(inode, page);
	}

	if (name)
		init_dent_inode(name, page);

	/*
	 * This file should be checkpointed during fsync.
	 * We lost i_pino from now on.
	 */
	if (is_inode_flag_set(F2FS_I(inode), FI_INC_LINK)) {
		file_lost_pino(inode);
		/*
		 * If link the tmpfile to alias through linkat path,
		 * we should remove this inode from orphan list.
		 */
		if (inode->i_nlink == 0)
			remove_orphan_inode(F2FS_I_SB(dir), inode->i_ino);
		inc_nlink(inode);
	}
	return page;

put_error:
	f2fs_put_page(page, 1);
error:
	/* once the failed inode becomes a bad inode, i_mode is S_IFREG */
	truncate_inode_pages(&inode->i_data, 0);
	truncate_blocks(inode, 0, false);
	remove_dirty_dir_inode(inode);
	remove_inode_page(inode);
	return ERR_PTR(err);
}

/* Common file handle decoding for both parent and dentry */
static struct dentry *
vnlayer_decode_fh(
    SUPER_T *sb,
    struct fid *fh,
    int len,                            /* counted in units of 4-bytes */
    int fhtype,
    int is_parent)
{
    MDKI_FID_T *lfidp;
    DENT_T *dp;
    int error, fidlen;
    SUPER_T *realsb;
    unsigned realsb_hash;

    fidlen = fhtype >> 1;
    if (fidlen == 0) {
        return ERR_PTR(-EINVAL);
    }

    if (len * 4 < MDKI_FID_LEN_WITH_HASH(fidlen)) {
        MDKI_VFS_LOG(VFS_LOG_ESTALE,
                      "%s: FH too small to be a MVFS FH\n",
                      __FUNCTION__);
        return ERR_PTR(-EINVAL);
    }

    lfidp = KMEM_ALLOC(MDKI_FID_ALLOC_LEN(fidlen), KM_SLEEP);
    if (lfidp == NULL) {
        return ERR_PTR(-ENOMEM);
    }

    if (is_parent) {
        error = vnlayer_unpack_fh((__u32 *)fh, len, fhtype, fidlen,
                                  NULL, lfidp);
    } else {
        error = vnlayer_unpack_fh((__u32 *)fh, len, fhtype, fidlen,
                                  lfidp, NULL);
    }

    if (error == 0) {
        realsb_hash = MDKI_FID_SB_HASH(fh, fidlen);

        /*
         * Search in the VOB mount list for the super_block we encoded.
         * If the result is not NULL, the superblock was locked with
         * lock_super and should be unlocked.
         */
        realsb = (SUPER_T *) mvfs_find_mount(vnlayer_eval_mount,
                                             &realsb_hash);

        if (realsb != NULL) {
            /*
             * It found a matching VOB mount to this hash, we will leave to
             * vnlayer_get_dentry decides wether we can trust this FID, 
             * it should be able to smell any staleness.
             */
            dp = vnlayer_get_dentry(realsb, lfidp);
            unlock_super(realsb);
            if (IS_ERR(dp)) {
                MDKI_VFS_LOG(VFS_LOG_ESTALE,
                    "%s: pid %d vnlayer_get_dentry returned error %ld\n",
                    __FUNCTION__, current->pid, PTR_ERR(dp));
            }
        } else {
            dp = ERR_PTR(-EINVAL);
            MDKI_VFS_LOG(VFS_LOG_ESTALE, "%s SB not found, hash=%08x\n",
                         __FUNCTION__, realsb_hash);
        }
    } else {
        dp = ERR_PTR(error);
    }
    KMEM_FREE(lfidp, MDKI_FID_ALLOC_LEN(fidlen));
    return dp;
}

struct q6v5_data __devinit *pil_q6v5_init(struct platform_device *pdev)
{
	struct q6v5_data *drv;
	struct resource *res;
	struct pil_desc *desc;
	int ret;

#ifdef CONFIG_MACH_LGE
	if (!strcmp(pdev->name, "mss"))
		dev_info(&pdev->dev, "pil_q6v5_init, %s \n", pdev->name);
#endif

	drv = devm_kzalloc(&pdev->dev, sizeof(*drv), GFP_KERNEL);
	if (!drv)
		return ERR_PTR(-ENOMEM);

	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "qdsp6_base");
	drv->reg_base = devm_request_and_ioremap(&pdev->dev, res);
	if (!drv->reg_base)
		return ERR_PTR(-ENOMEM);

	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "halt_base");
	drv->axi_halt_base = devm_ioremap(&pdev->dev, res->start,
					  resource_size(res));
	if (!drv->axi_halt_base)
		return ERR_PTR(-ENOMEM);

	desc = &drv->desc;
	ret = of_property_read_string(pdev->dev.of_node, "qcom,firmware-name",
				      &desc->name);
	if (ret)
		return ERR_PTR(ret);

	drv->xo = devm_clk_get(&pdev->dev, "xo");
	if (IS_ERR(drv->xo))
		return ERR_CAST(drv->xo);

	drv->vreg_cx = devm_regulator_get(&pdev->dev, "vdd_cx");
	if (IS_ERR(drv->vreg_cx))
		return ERR_CAST(drv->vreg_cx);

	drv->vreg_pll = devm_regulator_get(&pdev->dev, "vdd_pll");
	if (!IS_ERR(drv->vreg_pll)) {
		int voltage;
		ret = of_property_read_u32(pdev->dev.of_node, "qcom,vdd_pll",
					   &voltage);
		if (ret) {
			dev_err(&pdev->dev, "Failed to find vdd_pll voltage.\n");
			return ERR_PTR(ret);
		}

		ret = regulator_set_voltage(drv->vreg_pll, voltage, voltage);
		if (ret) {
			dev_err(&pdev->dev, "Failed to request vdd_pll voltage.\n");
			return ERR_PTR(ret);
		}

		ret = regulator_set_optimum_mode(drv->vreg_pll, 10000);
		if (ret < 0) {
			dev_err(&pdev->dev, "Failed to set vdd_pll mode.\n");
			return ERR_PTR(ret);
		}
	} else {
		 drv->vreg_pll = NULL;
	}

	desc->dev = &pdev->dev;

	return drv;
}

//.........这里部分代码省略.........
{
	struct crypto_cipher *cipher;
	struct crypto_instance *inst = (void *)tfm->__crt_alg;
	struct crypto_spawn *spawn = crypto_instance_ctx(inst);
	struct priv *ctx = crypto_tfm_ctx(tfm);
	u32 *flags = &tfm->crt_flags;

	cipher = crypto_spawn_cipher(spawn);
	if (IS_ERR(cipher))
		return PTR_ERR(cipher);

	if (crypto_cipher_blocksize(cipher) != XTS_BLOCK_SIZE) {
		*flags |= CRYPTO_TFM_RES_BAD_BLOCK_LEN;
		crypto_free_cipher(cipher);
		return -EINVAL;
	}

	ctx->child = cipher;

	cipher = crypto_spawn_cipher(spawn);
	if (IS_ERR(cipher)) {
		crypto_free_cipher(ctx->child);
		return PTR_ERR(cipher);
	}

	/*                                                            */
	if (crypto_cipher_blocksize(cipher) != XTS_BLOCK_SIZE) {
		crypto_free_cipher(cipher);
		crypto_free_cipher(ctx->child);
		*flags |= CRYPTO_TFM_RES_BAD_BLOCK_LEN;
		return -EINVAL;
	}

	ctx->tweak = cipher;

	return 0;
}

static void exit_tfm(struct crypto_tfm *tfm)
{
	struct priv *ctx = crypto_tfm_ctx(tfm);
	crypto_free_cipher(ctx->child);
	crypto_free_cipher(ctx->tweak);
}

static struct crypto_instance *alloc(struct rtattr **tb)
{
	struct crypto_instance *inst;
	struct crypto_alg *alg;
	int err;

	err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_BLKCIPHER);
	if (err)
		return ERR_PTR(err);

	alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_CIPHER,
				  CRYPTO_ALG_TYPE_MASK);
	if (IS_ERR(alg))
		return ERR_CAST(alg);

	inst = crypto_alloc_instance("xts", alg);
	if (IS_ERR(inst))
		goto out_put_alg;

	inst->alg.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER;
	inst->alg.cra_priority = alg->cra_priority;
	inst->alg.cra_blocksize = alg->cra_blocksize;

	if (alg->cra_alignmask < 7)
		inst->alg.cra_alignmask = 7;
	else
		inst->alg.cra_alignmask = alg->cra_alignmask;

	inst->alg.cra_type = &crypto_blkcipher_type;

	inst->alg.cra_blkcipher.ivsize = alg->cra_blocksize;
	inst->alg.cra_blkcipher.min_keysize =
		2 * alg->cra_cipher.cia_min_keysize;
	inst->alg.cra_blkcipher.max_keysize =
		2 * alg->cra_cipher.cia_max_keysize;

	inst->alg.cra_ctxsize = sizeof(struct priv);

	inst->alg.cra_init = init_tfm;
	inst->alg.cra_exit = exit_tfm;

	inst->alg.cra_blkcipher.setkey = setkey;
	inst->alg.cra_blkcipher.encrypt = encrypt;
	inst->alg.cra_blkcipher.decrypt = decrypt;

out_put_alg:
	crypto_mod_put(alg);
	return inst;
}

static void free(struct crypto_instance *inst)
{
	crypto_drop_spawn(crypto_instance_ctx(inst));
	kfree(inst);
}

//.........这里部分代码省略.........
    if (dentry->d_op && dentry->d_op->d_dname)
    {
        path = d_path(&pathPath, buffer, buflen);
        if ( unlikely( IS_ERR(path) != 0 ) )
        {
            critical("talpa__d_path: d_path returned an error: %ld",PTR_ERR(path));
            path = NULL;
        }
        if ( NULL != path )
        {
            return path;
        }
    }
#endif /* TALPA_D_DNAME_DIRECT_DPATH */

#   if defined TALPA_DPATH_SLES11
    path = kernel_d_path(&pathPath, &rootPath, buffer, buflen, 0);
#   elif defined TALPA_DPATH_PATH
    path = kernel_d_path(&pathPath, &rootPath, buffer, buflen);
#   elif defined TALPA_DPATH_SUSE103
    path = kernel_d_path(dentry, vfsmnt, root, rootmnt, buffer, buflen, 0);
#   else
    path = kernel_d_path(dentry, vfsmnt, root, rootmnt, buffer, buflen);
#   endif
#else
    /* Call our own version */
    path = __talpa_d_path(dentry, vfsmnt, root, rootmnt, buffer, buflen);
#endif

#if defined HOLD_DCACHE_LOCK_WHILE_CALLING_D_PATH
    spin_unlock(&dcache_lock);
#endif

    if ( unlikely( IS_ERR(path) != 0 ) )
    {
        critical("talpa__d_path: kernel__d_path returned an error: %ld",PTR_ERR(path));
        path = NULL;
    }
    else if ( unlikely( NULL == path ) )
    {
#ifdef TALPA_D_DNAME_DIRECT_DPATH
        /* only use this as a fall-back, it will only return the relative path from a chroot
         * Use this in cases where kernel_d_path fails to return a valid path for bind mounts
         * in newer kernel in a systemd environment */
        path = d_path(&pathPath, buffer, buflen);
        if ( unlikely( IS_ERR(path) != 0 ) )
        {
            critical("talpa__d_path: kernel_d_path returned an error: %ld",PTR_ERR(path));
            path = NULL;
        }
        dbg("    dpath=%s",path);

        if (dentry->d_op && dentry->d_op->d_dname)
        {
            err("dpath=%s - dentry has d_op and d_dname=%p",path,dentry->d_op->d_dname);
        }
#endif
        if ( NULL == path )
        {
            if (!IS_ROOT(dentry) && d_unhashed(dentry)) {
                dbg("talpa__d_path: kernel_d_path returned NULL for deleted file");
                dbg("    basename=%s",dentry->d_name.name);
            }
            else
            {
                info("talpa__d_path: kernel_d_path returned NULL for non-deleted file");
                info("    basename=%s",dentry->d_name.name);
            }
        }
        else
        {
            if (!IS_ROOT(dentry) && d_unhashed(dentry))
            {
                dbg("    talpa__d_path: kernel_d_path returned NULL but d_path returned path %s for deleted file",path);
            }
            else
            {
#ifdef TALPA_MNT_NAMESPACE
                if (NULL != getNamespaceInfo(vfsmnt) && (!S_ISDIR(dentry->d_inode->i_mode)))
                {
                    /* we're in a namespace/container, append '(namespace)' to the path */
                    int pathlen=strlen(path);
                    if (pathlen + 13 > buflen)
                    {
                        return ERR_PTR(-ENAMETOOLONG);
                    }
                    memmove(buffer, path, pathlen);
                    path = buffer;
                    memcpy(buffer + pathlen, " (namespace)", 13);
                }
#endif

                /* the systemd / containers / bind mount case. */
                dbg("    talpa__d_path: kernel_d_path returned NULL but d_path returned path %s for non-deleted file",path);
            }
        }
    }

    return path;
}

/*
 * look up an entry in a directory
 */
static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry,
				 struct nameidata *nd)
{
	struct afs_vnode *vnode;
	struct afs_fid fid;
	struct inode *inode;
	struct key *key;
	int ret;

	vnode = AFS_FS_I(dir);

	_enter("{%x:%u},%p{%s},",
	       vnode->fid.vid, vnode->fid.vnode, dentry, dentry->d_name.name);

	ASSERTCMP(dentry->d_inode, ==, NULL);

	if (dentry->d_name.len >= AFSNAMEMAX) {
		_leave(" = -ENAMETOOLONG");
		return ERR_PTR(-ENAMETOOLONG);
	}

	if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
		_leave(" = -ESTALE");
		return ERR_PTR(-ESTALE);
	}

	key = afs_request_key(vnode->volume->cell);
	if (IS_ERR(key)) {
		_leave(" = %ld [key]", PTR_ERR(key));
		return ERR_CAST(key);
	}

	ret = afs_validate(vnode, key);
	if (ret < 0) {
		key_put(key);
		_leave(" = %d [val]", ret);
		return ERR_PTR(ret);
	}

	ret = afs_do_lookup(dir, dentry, &fid, key);
	if (ret < 0) {
		inode = afs_try_auto_mntpt(ret, dentry, dir, key, &fid);
		if (!IS_ERR(inode)) {
			key_put(key);
			goto success;
		}

		ret = PTR_ERR(inode);
		key_put(key);
		if (ret == -ENOENT) {
			d_add(dentry, NULL);
			_leave(" = NULL [negative]");
			return NULL;
		}
		_leave(" = %d [do]", ret);
		return ERR_PTR(ret);
	}
	dentry->d_fsdata = (void *)(unsigned long) vnode->status.data_version;

	/* instantiate the dentry */
	inode = afs_iget(dir->i_sb, key, &fid, NULL, NULL);
	key_put(key);
	if (IS_ERR(inode)) {
		_leave(" = %ld", PTR_ERR(inode));
		return ERR_CAST(inode);
	}

success:
	d_add(dentry, inode);
	_leave(" = 0 { vn=%u u=%u } -> { ino=%lu v=%u }",
	       fid.vnode,
	       fid.unique,
	       dentry->d_inode->i_ino,
	       dentry->d_inode->i_generation);

	return NULL;
}

//.........这里部分代码省略.........
			LOGW("%s: read %s failed, %[email protected]%x\n", __func__,
			     dheader->name, dheader->used, dheader->offset);
		}
	}
	return oops;
}

int ipanic(struct notifier_block *this, unsigned long event, void *ptr)
{
	struct ipanic_data_header *dheader;
	struct kmsg_dumper dumper;
    ipanic_atf_log_rec_t atf_log = {ATF_LOG_SIZE, 0, 0};
	int dt;
	int errno;
	struct ipanic_header *ipanic_hdr = ipanic_header();

#if 0//                           
		return NOTIFY_DONE;
#endif

	aee_rr_rec_fiq_step(AEE_FIQ_STEP_KE_IPANIC_START);
	bust_spinlocks(1);
	spin_lock_irq(&ipanic_lock);
	aee_disable_api();
	if (!ipanic_data_is_valid(IPANIC_DT_KERNEL_LOG)) {
		ipanic_klog_region(&dumper);
		errno = ipanic_data_to_sd(IPANIC_DT_KERNEL_LOG, &dumper);
		if (errno == -1)
			aee_nested_printf("$");
	}
	ipanic_klog_region(&dumper);
	errno = ipanic_data_to_sd(IPANIC_DT_OOPS_LOG, &dumper);
	if (errno == -1)
		aee_nested_printf("$");
	ipanic_data_to_sd(IPANIC_DT_CURRENT_TSK, 0);
	/* kick wdt after save the most critical infos */
	ipanic_kick_wdt();
	ipanic_data_to_sd(IPANIC_DT_MAIN_LOG, (void *)1);
	ipanic_data_to_sd(IPANIC_DT_SYSTEM_LOG, (void *)4);
	ipanic_data_to_sd(IPANIC_DT_EVENTS_LOG, (void *)2);
	ipanic_data_to_sd(IPANIC_DT_RADIO_LOG, (void *)3);
	aee_wdt_dump_info();
	ipanic_klog_region(&dumper);
	ipanic_data_to_sd(IPANIC_DT_WDT_LOG, &dumper);
#ifdef CONFIG_MTK_WQ_DEBUG
	mt_dump_wq_debugger();
#endif
	ipanic_klog_region(&dumper);
	ipanic_data_to_sd(IPANIC_DT_WQ_LOG, &dumper);
	ipanic_data_to_sd(IPANIC_DT_MMPROFILE, 0);
	ipanic_data_to_sd(IPANIC_DT_ATF_LOG, &atf_log);
	errno = ipanic_header_to_sd(0);
	if (!IS_ERR(ERR_PTR(errno)))
		mrdump_mini_ipanic_done();
	ipanic_klog_region(&dumper);
	ipanic_data_to_sd(IPANIC_DT_LAST_LOG, &dumper);
	LOGD("ipanic done^_^");
	for (dt = IPANIC_DT_HEADER + 1; dt < IPANIC_DT_RESERVED31; dt++) {
		dheader = &ipanic_hdr->data_hdr[dt];
		if (dheader->valid) {
			LOGD("%s[%[email protected]%x],", dheader->name, dheader->used, dheader->offset);
		}
	}
	LOGD("^_^\n");
	aee_rr_rec_fiq_step(AEE_FIQ_STEP_KE_IPANIC_DONE);

	return NOTIFY_DONE;
}

void ipanic_recursive_ke(struct pt_regs *regs, struct pt_regs *excp_regs, int cpu)
{
	int errno;
	struct kmsg_dumper dumper;
	aee_nested_printf("minidump\n");
	bust_spinlocks(1);
	flush_cache_all();
#ifdef __aarch64__
	cpu_cache_off();
#else
	cpu_proc_fin();
#endif
	mrdump_mini_ke_cpu_regs(excp_regs);
	mrdump_mini_per_cpu_regs(cpu, regs);
	flush_cache_all();
	ipanic_mrdump_mini(AEE_REBOOT_MODE_NESTED_EXCEPTION, "Nested Panic");

	ipanic_data_to_sd(IPANIC_DT_CURRENT_TSK, 0);
	ipanic_kick_wdt();
	ipanic_klog_region(&dumper);
	ipanic_data_to_sd(IPANIC_DT_KERNEL_LOG, &dumper);
	errno = ipanic_header_to_sd(0);
	if (!IS_ERR(ERR_PTR(errno)))
		mrdump_mini_ipanic_done();
	if (ipanic_dt_active(IPANIC_DT_RAM_DUMP)) {
		aee_nested_printf("RAMDUMP.\n");
		__mrdump_create_oops_dump(AEE_REBOOT_MODE_NESTED_EXCEPTION, excp_regs,
					  "Nested Panic");
	}
	bust_spinlocks(0);
}

struct dentry *f2fs_get_parent(struct dentry *child)
{
	struct qstr dotdot = {.len = 2, .name = ".."};
	unsigned long ino = f2fs_inode_by_name(child->d_inode, &dotdot);
	if (!ino)
		return ERR_PTR(-ENOENT);
	return d_obtain_alias(f2fs_iget(child->d_inode->i_sb, ino));
}

static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
					struct nameidata *nd)
{
	struct inode *inode = NULL;
	struct f2fs_dir_entry *de;
	struct page *page;

	if (dentry->d_name.len > F2FS_NAME_LEN)
		return ERR_PTR(-ENAMETOOLONG);

	de = f2fs_find_entry(dir, &dentry->d_name, &page, nd ? nd->flags : 0);
	if (de) {
		nid_t ino = le32_to_cpu(de->ino);
		f2fs_dentry_kunmap(dir, page);
		f2fs_put_page(page, 0);

		inode = f2fs_iget(dir->i_sb, ino);
		if (IS_ERR(inode))
			return ERR_CAST(inode);
	}

	return d_splice_alias(inode, dentry);
}

static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
{
	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
	struct inode *inode = dentry->d_inode;
	struct f2fs_dir_entry *de;
	struct page *page;
	int err = -ENOENT;

	trace_f2fs_unlink_enter(dir, dentry);
	f2fs_balance_fs(sbi);

	de = f2fs_find_entry(dir, &dentry->d_name, &page, 0);
	if (!de)
		goto fail;

	f2fs_lock_op(sbi);
	err = acquire_orphan_inode(sbi);
	if (err) {
		f2fs_unlock_op(sbi);
		f2fs_dentry_kunmap(dir, page);
		f2fs_put_page(page, 0);
		goto fail;
	}
	f2fs_delete_entry(de, page, dir, inode);
	f2fs_unlock_op(sbi);

	/* In order to evict this inode, we set it dirty */
	mark_inode_dirty(inode);
fail:
	trace_f2fs_unlink_exit(inode, err);
	return err;
}

static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
					const char *symname)
{
	struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
	struct inode *inode;
	size_t symlen = strlen(symname) + 1;
	int err;

	f2fs_balance_fs(sbi);

	inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
	if (IS_ERR(inode))
		return PTR_ERR(inode);

	inode->i_op = &f2fs_symlink_inode_operations;
	inode->i_mapping->a_ops = &f2fs_dblock_aops;

	f2fs_lock_op(sbi);
	err = f2fs_add_link(dentry, inode);
	if (err)
		goto out;
	f2fs_unlock_op(sbi);

	err = page_symlink(inode, symname, symlen);
	alloc_nid_done(sbi, inode->i_ino);

	d_instantiate(dentry, inode);
	unlock_new_inode(inode);
	return err;
out:
	handle_failed_inode(inode);
	return err;
}

//.........这里部分代码省略.........

int
#endif
vnode_shadow_iop_follow_link(
    DENT_T *dentry,            /* entry we are trying to resolve */
    struct nameidata *nd       /* Contains parent dentry */
)
{
    int err = 0;
    int len = PATH_MAX;
    char *buff;
    mm_segment_t old_fs;        /* Because we provide a kernel buffer. */
    INODE_T *real_inode;
    DENT_T *real_dentry;
    VNODE_T *cvp;

    /* this function must consume a reference on base */
    /* We only path_release on error. */

    err = 0;

    real_dentry = REALDENTRY_LOCKED(dentry, &cvp);
    if (real_dentry == NULL) {
	err = -ENOENT;
        MDKI_PATH_RELEASE(nd);
        goto out_nolock;
    }
    VNODE_DGET(real_dentry);             /* protect inode */
    if (real_dentry->d_inode == NULL) {
        /* delete race */
	err = -ENOENT;
        MDKI_PATH_RELEASE(nd);
        goto out;
    }
    real_inode = real_dentry->d_inode;
    /* If there are no underlying symlink functions, we are done */
    if (real_inode->i_op && real_inode->i_op->readlink &&
        real_inode->i_op->follow_link)
    {
        buff = KMEM_ALLOC(len, KM_SLEEP);
        if (!buff) {
            MDKI_PATH_RELEASE(nd);
            err = -ENOMEM;
            goto out;
        }
        /* We're providing a kernel buffer to copy into, so let everyone know. */
        old_fs = get_fs();
        set_fs(KERNEL_DS);
        err = vnode_shadow_iop_readlink(dentry, buff, len);
        set_fs(old_fs);
        if (err < 0) {
            KMEM_FREE(buff, len);
            MDKI_PATH_RELEASE(nd);
            goto out;
        }
        /* done with dentry */
        /* Make sure string is null terminated */
        buff[err] = 0;
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,13)
        err = vfs_follow_link(nd, buff);
        KMEM_FREE(buff,len);
#else
        VNODE_DPUT(real_dentry);
        REALDENTRY_UNLOCK(dentry, cvp);
        nd_set_link(nd, buff);
        return(buff); /* vnop_iop_put_link() will free this buf. */
#endif
    }
out:
    VNODE_DPUT(real_dentry);
    REALDENTRY_UNLOCK(dentry, cvp);
out_nolock:
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,13)
    return ERR_PTR(err);
#else
    return(err);
#endif
}

static struct file *__dentry_open(struct dentry *dentry, struct vfsmount *mnt,
					struct file *f,
					int (*open)(struct inode *, struct file *),
					const struct cred *cred)
{
	static const struct file_operations empty_fops = {};
	struct inode *inode;
	int error;

	f->f_mode = OPEN_FMODE(f->f_flags) | FMODE_LSEEK |
				FMODE_PREAD | FMODE_PWRITE;

	if (unlikely(f->f_flags & O_PATH))
		f->f_mode = FMODE_PATH;

	inode = dentry->d_inode;
	if (f->f_mode & FMODE_WRITE) {
		error = __get_file_write_access(inode, mnt);
		if (error)
			goto cleanup_file;
		if (!special_file(inode->i_mode))
			file_take_write(f);
	}

	f->f_mapping = inode->i_mapping;
	f->f_path.dentry = dentry;
	f->f_path.mnt = mnt;
	f->f_pos = 0;
	file_sb_list_add(f, inode->i_sb);

	if (unlikely(f->f_mode & FMODE_PATH)) {
		f->f_op = &empty_fops;
		return f;
	}

	f->f_op = fops_get(inode->i_fop);

	error = security_dentry_open(f, cred);
	if (error)
		goto cleanup_all;

	if (!open && f->f_op)
		open = f->f_op->open;
	if (open) {
		error = open(inode, f);
		if (error)
			goto cleanup_all;
	}
	if ((f->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ)
		i_readcount_inc(inode);

	f->f_flags &= ~(O_CREAT | O_EXCL | O_NOCTTY | O_TRUNC);

	file_ra_state_init(&f->f_ra, f->f_mapping->host->i_mapping);

	/* NB: we're sure to have correct a_ops only after f_op->open */
	if (f->f_flags & O_DIRECT) {
		if (!f->f_mapping->a_ops ||
		    ((!f->f_mapping->a_ops->direct_IO) &&
		    (!f->f_mapping->a_ops->get_xip_mem))) {
			fput(f);
			f = ERR_PTR(-EINVAL);
		}
	}

	return f;

cleanup_all:
	fops_put(f->f_op);
	if (f->f_mode & FMODE_WRITE) {
		put_write_access(inode);
		if (!special_file(inode->i_mode)) {
			/*
			 * We don't consider this a real
			 * mnt_want/drop_write() pair
			 * because it all happenend right
			 * here, so just reset the state.
			 */
			file_reset_write(f);
			mnt_drop_write(mnt);
		}
	}
	file_sb_list_del(f);
	f->f_path.dentry = NULL;
	f->f_path.mnt = NULL;
cleanup_file:
	put_filp(f);
	dput(dentry);
	mntput(mnt);
	return ERR_PTR(error);
}

/**
 * adreno_drawctxt_create - create a new adreno draw context
 * @dev_priv: the owner of the context
 * @flags: flags for the context (passed from user space)
 *
 * Create and return a new draw context for the 3D core.
 */
struct kgsl_context *
adreno_drawctxt_create(struct kgsl_device_private *dev_priv,
			uint32_t *flags)
{
	struct adreno_context *drawctxt;
	struct kgsl_device *device = dev_priv->device;
	struct adreno_device *adreno_dev = ADRENO_DEVICE(device);
	int ret;
	unsigned long local;

	local = *flags & (KGSL_CONTEXT_PREAMBLE |
		KGSL_CONTEXT_NO_GMEM_ALLOC |
		KGSL_CONTEXT_PER_CONTEXT_TS |
		KGSL_CONTEXT_USER_GENERATED_TS |
		KGSL_CONTEXT_NO_FAULT_TOLERANCE |
		KGSL_CONTEXT_CTX_SWITCH |
		KGSL_CONTEXT_PRIORITY_MASK |
		KGSL_CONTEXT_TYPE_MASK |
		KGSL_CONTEXT_PWR_CONSTRAINT |
		KGSL_CONTEXT_IFH_NOP |
		KGSL_CONTEXT_SECURE);

	/* Check for errors before trying to initialize */

	/* We no longer support legacy context switching */
	if ((local & KGSL_CONTEXT_PREAMBLE) == 0 ||
		(local & KGSL_CONTEXT_NO_GMEM_ALLOC) == 0) {
		KGSL_DEV_ERR_ONCE(device,
			"legacy context switch not supported\n");
		return ERR_PTR(-EINVAL);
	}

	/* Make sure that our target can support secure contexts if requested */
	if (!kgsl_mmu_is_secured(&dev_priv->device->mmu) &&
			(local & KGSL_CONTEXT_SECURE)) {
		KGSL_DEV_ERR_ONCE(device, "Secure context not supported\n");
		return ERR_PTR(-EOPNOTSUPP);
	}

	drawctxt = kzalloc(sizeof(struct adreno_context), GFP_KERNEL);

	if (drawctxt == NULL)
		return ERR_PTR(-ENOMEM);

	ret = kgsl_context_init(dev_priv, &drawctxt->base);
	if (ret != 0) {
		kfree(drawctxt);
		return ERR_PTR(ret);
	}

	drawctxt->timestamp = 0;

	drawctxt->base.flags = local;

	/* Always enable per-context timestamps */
	drawctxt->base.flags |= KGSL_CONTEXT_PER_CONTEXT_TS;
	drawctxt->type = (drawctxt->base.flags & KGSL_CONTEXT_TYPE_MASK)
		>> KGSL_CONTEXT_TYPE_SHIFT;
	spin_lock_init(&drawctxt->lock);
	init_waitqueue_head(&drawctxt->wq);
	init_waitqueue_head(&drawctxt->waiting);

	/* Set the context priority */
	_set_context_priority(drawctxt);
	/* set the context ringbuffer */
	drawctxt->rb = adreno_ctx_get_rb(adreno_dev, drawctxt);

	/*
	 * Set up the plist node for the dispatcher.  Insert the node into the
	 * drawctxt pending list based on priority.
	 */
	plist_node_init(&drawctxt->pending, drawctxt->base.priority);

	kgsl_sharedmem_writel(device, &device->memstore,
			KGSL_MEMSTORE_OFFSET(drawctxt->base.id, soptimestamp),
			0);
	kgsl_sharedmem_writel(device, &device->memstore,
			KGSL_MEMSTORE_OFFSET(drawctxt->base.id, eoptimestamp),
			0);

	adreno_context_debugfs_init(ADRENO_DEVICE(device), drawctxt);

	/* copy back whatever flags we dediced were valid */
	*flags = drawctxt->base.flags;
	return &drawctxt->base;
}

static struct hfs_bnode *hfs_bnode_split(struct hfs_find_data *fd)
{
	struct hfs_btree *tree;
	struct hfs_bnode *node, *new_node, *next_node;
	struct hfs_bnode_desc node_desc;
	int num_recs, new_rec_off, new_off, old_rec_off;
	int data_start, data_end, size;

	tree = fd->tree;
	node = fd->bnode;
	new_node = hfs_bmap_alloc(tree);
	if (IS_ERR(new_node))
		return new_node;
	hfs_bnode_get(node);
	hfs_dbg(BNODE_MOD, "split_nodes: %d - %d - %d\n",
		node->this, new_node->this, node->next);
	new_node->next = node->next;
	new_node->prev = node->this;
	new_node->parent = node->parent;
	new_node->type = node->type;
	new_node->height = node->height;

	if (node->next)
		next_node = hfs_bnode_find(tree, node->next);
	else
		next_node = NULL;

	if (IS_ERR(next_node)) {
		hfs_bnode_put(node);
		hfs_bnode_put(new_node);
		return next_node;
	}

	size = tree->node_size / 2 - node->num_recs * 2 - 14;
	old_rec_off = tree->node_size - 4;
	num_recs = 1;
	for (;;) {
		data_start = hfs_bnode_read_u16(node, old_rec_off);
		if (data_start > size)
			break;
		old_rec_off -= 2;
		if (++num_recs < node->num_recs)
			continue;
		/* panic? */
		hfs_bnode_put(node);
		hfs_bnode_put(new_node);
		if (next_node)
			hfs_bnode_put(next_node);
		return ERR_PTR(-ENOSPC);
	}

	if (fd->record + 1 < num_recs) {
		/* new record is in the lower half,
		 * so leave some more space there
		 */
		old_rec_off += 2;
		num_recs--;
		data_start = hfs_bnode_read_u16(node, old_rec_off);
	} else {
		hfs_bnode_put(node);
		hfs_bnode_get(new_node);
		fd->bnode = new_node;
		fd->record -= num_recs;
		fd->keyoffset -= data_start - 14;
		fd->entryoffset -= data_start - 14;
	}
	new_node->num_recs = node->num_recs - num_recs;
	node->num_recs = num_recs;

	new_rec_off = tree->node_size - 2;
	new_off = 14;
	size = data_start - new_off;
	num_recs = new_node->num_recs;
	data_end = data_start;
	while (num_recs) {
		hfs_bnode_write_u16(new_node, new_rec_off, new_off);
		old_rec_off -= 2;
		new_rec_off -= 2;
		data_end = hfs_bnode_read_u16(node, old_rec_off);
		new_off = data_end - size;
		num_recs--;
	}
	hfs_bnode_write_u16(new_node, new_rec_off, new_off);
	hfs_bnode_copy(new_node, 14, node, data_start, data_end - data_start);

	/* update new bnode header */
	node_desc.next = cpu_to_be32(new_node->next);
	node_desc.prev = cpu_to_be32(new_node->prev);
	node_desc.type = new_node->type;
	node_desc.height = new_node->height;
	node_desc.num_recs = cpu_to_be16(new_node->num_recs);
	node_desc.reserved = 0;
	hfs_bnode_write(new_node, &node_desc, 0, sizeof(node_desc));

	/* update previous bnode header */
	node->next = new_node->this;
	hfs_bnode_read(node, &node_desc, 0, sizeof(node_desc));
	node_desc.next = cpu_to_be32(node->next);
	node_desc.num_recs = cpu_to_be16(node->num_recs);
	hfs_bnode_write(node, &node_desc, 0, sizeof(node_desc));
//.........这里部分代码省略.........

struct dentry *hpfs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
{
    const unsigned char *name = dentry->d_name.name;
    unsigned len = dentry->d_name.len;
    struct quad_buffer_head qbh;
    struct hpfs_dirent *de;
    ino_t ino;
    int err;
    struct inode *result = NULL;
    struct hpfs_inode_info *hpfs_result;

    hpfs_lock(dir->i_sb);
    if ((err = hpfs_chk_name(name, &len))) {
        if (err == -ENAMETOOLONG) {
            hpfs_unlock(dir->i_sb);
            return ERR_PTR(-ENAMETOOLONG);
        }
        goto end_add;
    }

    /*
     * '.' and '..' will never be passed here.
     */

    de = map_dirent(dir, hpfs_i(dir)->i_dno, name, len, NULL, &qbh);

    /*
     * This is not really a bailout, just means file not found.
     */

    if (!de) goto end;

    /*
     * Get inode number, what we're after.
     */

    ino = le32_to_cpu(de->fnode);

    /*
     * Go find or make an inode.
     */

    result = iget_locked(dir->i_sb, ino);
    if (!result) {
        hpfs_error(dir->i_sb, "hpfs_lookup: can't get inode");
        goto bail1;
    }
    if (result->i_state & I_NEW) {
        hpfs_init_inode(result);
        if (de->directory)
            hpfs_read_inode(result);
        else if (le32_to_cpu(de->ea_size) && hpfs_sb(dir->i_sb)->sb_eas)
            hpfs_read_inode(result);
        else {
            result->i_mode |= S_IFREG;
            result->i_mode &= ~0111;
            result->i_op = &hpfs_file_iops;
            result->i_fop = &hpfs_file_ops;
            set_nlink(result, 1);
        }
        unlock_new_inode(result);
    }
    hpfs_result = hpfs_i(result);
    if (!de->directory) hpfs_result->i_parent_dir = dir->i_ino;

    if (de->has_acl || de->has_xtd_perm) if (!(dir->i_sb->s_flags & MS_RDONLY)) {
            hpfs_error(result->i_sb, "ACLs or XPERM found. This is probably HPFS386. This driver doesn't support it now. Send me some info on these structures");
            goto bail1;
        }

    /*
     * Fill in the info from the directory if this is a newly created
     * inode.
     */

    if (!result->i_ctime.tv_sec) {
        if (!(result->i_ctime.tv_sec = local_to_gmt(dir->i_sb, le32_to_cpu(de->creation_date))))
            result->i_ctime.tv_sec = 1;
        result->i_ctime.tv_nsec = 0;
        result->i_mtime.tv_sec = local_to_gmt(dir->i_sb, le32_to_cpu(de->write_date));
        result->i_mtime.tv_nsec = 0;
        result->i_atime.tv_sec = local_to_gmt(dir->i_sb, le32_to_cpu(de->read_date));
        result->i_atime.tv_nsec = 0;
        hpfs_result->i_ea_size = le32_to_cpu(de->ea_size);
        if (!hpfs_result->i_ea_mode && de->read_only)
            result->i_mode &= ~0222;
        if (!de->directory) {
            if (result->i_size == -1) {
                result->i_size = le32_to_cpu(de->file_size);
                result->i_data.a_ops = &hpfs_aops;
                hpfs_i(result)->mmu_private = result->i_size;
                /*
                 * i_blocks should count the fnode and any anodes.
                 * We count 1 for the fnode and don't bother about
                 * anodes -- the disk heads are on the directory band
                 * and we want them to stay there.
                 */
                result->i_blocks = 1 + ((result->i_size + 511) >> 9);
            }
        }
//.........这里部分代码省略.........

static int ll_get_name(struct dentry *dentry, char *name,
		       struct dentry *child)
{
	struct inode *dir = d_inode(dentry);
	int rc;
	struct ll_getname_data lgd = {
		.lgd_name = name,
		.lgd_fid = ll_i2info(d_inode(child))->lli_fid,
		.ctx.actor = ll_nfs_get_name_filldir,
	};

	if (!dir || !S_ISDIR(dir->i_mode)) {
		rc = -ENOTDIR;
		goto out;
	}

	if (!dir->i_fop) {
		rc = -EINVAL;
		goto out;
	}

	mutex_lock(&dir->i_mutex);
	rc = ll_dir_read(dir, &lgd.ctx);
	mutex_unlock(&dir->i_mutex);
	if (!rc && !lgd.lgd_found)
		rc = -ENOENT;
out:
	return rc;
}

static struct dentry *ll_fh_to_dentry(struct super_block *sb, struct fid *fid,
				      int fh_len, int fh_type)
{
	struct lustre_nfs_fid *nfs_fid = (struct lustre_nfs_fid *)fid;

	if (fh_type != LUSTRE_NFS_FID)
		return ERR_PTR(-EPROTO);

	return ll_iget_for_nfs(sb, &nfs_fid->lnf_child, &nfs_fid->lnf_parent);
}

static struct dentry *ll_fh_to_parent(struct super_block *sb, struct fid *fid,
				      int fh_len, int fh_type)
{
	struct lustre_nfs_fid *nfs_fid = (struct lustre_nfs_fid *)fid;

	if (fh_type != LUSTRE_NFS_FID)
		return ERR_PTR(-EPROTO);

	return ll_iget_for_nfs(sb, &nfs_fid->lnf_parent, NULL);
}

static struct dentry *ll_get_parent(struct dentry *dchild)
{
	struct ptlrpc_request *req = NULL;
	struct inode	  *dir = d_inode(dchild);
	struct ll_sb_info     *sbi;
	struct dentry	 *result = NULL;
	struct mdt_body       *body;
	static char	   dotdot[] = "..";
	struct md_op_data     *op_data;
	int		   rc;
	int		      lmmsize;

	LASSERT(dir && S_ISDIR(dir->i_mode));

	sbi = ll_s2sbi(dir->i_sb);

	CDEBUG(D_INFO, "getting parent for (%lu,"DFID")\n",
			dir->i_ino, PFID(ll_inode2fid(dir)));

	rc = ll_get_default_mdsize(sbi, &lmmsize);
	if (rc != 0)
		return ERR_PTR(rc);

	op_data = ll_prep_md_op_data(NULL, dir, NULL, dotdot,
				     strlen(dotdot), lmmsize,
				     LUSTRE_OPC_ANY, NULL);
	if (IS_ERR(op_data))
		return (void *)op_data;

	rc = md_getattr_name(sbi->ll_md_exp, op_data, &req);
	ll_finish_md_op_data(op_data);
	if (rc) {
		CERROR("failure %d inode %lu get parent\n", rc, dir->i_ino);
		return ERR_PTR(rc);
	}
	body = req_capsule_server_get(&req->rq_pill, &RMF_MDT_BODY);
	LASSERT(body->valid & OBD_MD_FLID);

	CDEBUG(D_INFO, "parent for "DFID" is "DFID"\n",
		PFID(ll_inode2fid(dir)), PFID(&body->fid1));

	result = ll_iget_for_nfs(dir->i_sb, &body->fid1, NULL);

	ptlrpc_req_finished(req);
	return result;
}

struct export_operations lustre_export_operations = {
//.........这里部分代码省略.........