litmus-rt.git - The LITMUS^RT kernel.

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author	Christoph Hellwig <hch@lst.de>	2014-05-05 07:11:59 -0400
committer	Christoph Hellwig <hch@lst.de>	2015-02-02 12:09:42 -0500
commit	9cf514ccfacb301f3b1b4509a8ce25dffad55880 (patch)
tree	2d78e2ad865bfc77c910b100c1fadab8f5004def /include/linux/pps_kernel.h
parent	4d227fca1b32f95f1246894ebef879efccb2ec15 (diff)

nfsd: implement pNFS operations

Add support for the GETDEVICEINFO, LAYOUTGET, LAYOUTCOMMIT and LAYOUTRETURN NFSv4.1 operations, as well as backing code to manage outstanding layouts and devices. Layout management is very straight forward, with a nfs4_layout_stateid structure that extends nfs4_stid to manage layout stateids as the top-level structure. It is linked into the nfs4_file and nfs4_client structures like the other stateids, and contains a linked list of layouts that hang of the stateid. The actual layout operations are implemented in layout drivers that are not part of this commit, but will be added later. The worst part of this commit is the management of the pNFS device IDs, which suffers from a specification that is not sanely implementable due to the fact that the device-IDs are global and not bound to an export, and have a small enough size so that we can't store the fsid portion of a file handle, and must never be reused. As we still do need perform all export authentication and validation checks on a device ID passed to GETDEVICEINFO we are caught between a rock and a hard place. To work around this issue we add a new hash that maps from a 64-bit integer to a fsid so that we can look up the export to authenticate against it, a 32-bit integer as a generation that we can bump when changing the device, and a currently unused 32-bit integer that could be used in the future to handle more than a single device per export. Entries in this hash table are never deleted as we can't reuse the ids anyway, and would have a severe lifetime problem anyway as Linux export structures are temporary structures that can go away under load. Parts of the XDR data, structures and marshaling/unmarshaling code, as well as many concepts are derived from the old pNFS server implementation from Andy Adamson, Benny Halevy, Dean Hildebrand, Marc Eshel, Fred Isaman, Mike Sager, Ricardo Labiaga and many others. Signed-off-by: Christoph Hellwig <hch@lst.de>

Diffstat (limited to 'include/linux/pps_kernel.h')

0 files changed, 0 insertions, 0 deletions

/* * fixed.c * * Copyright 2008 Wolfson Microelectronics PLC. * * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> * * Copyright (c) 2009 Nokia Corporation * Roger Quadros <ext-roger.quadros@nokia.com> * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation; either version 2 of the * License, or (at your option) any later version. * * This is useful for systems with mixed controllable and * non-controllable regulators, as well as for allowing testing on * systems with no controllable regulators. */ #include <linux/err.h> #include <linux/mutex.h> #include <linux/module.h> #include <linux/platform_device.h> #include <linux/regulator/driver.h> #include <linux/regulator/fixed.h> #include <linux/gpio.h> #include <linux/slab.h> #include <linux/of.h> #include <linux/of_gpio.h> #include <linux/regulator/of_regulator.h> #include <linux/regulator/machine.h> struct fixed_voltage_data { struct regulator_desc desc; struct regulator_dev *dev; int microvolts; }; /** * of_get_fixed_voltage_config - extract fixed_voltage_config structure info * @dev: device requesting for fixed_voltage_config * * Populates fixed_voltage_config structure by extracting data from device * tree node, returns a pointer to the populated structure of NULL if memory * alloc fails. */ static struct fixed_voltage_config * of_get_fixed_voltage_config(struct device *dev) { struct fixed_voltage_config *config; struct device_node *np = dev->of_node; const __be32 *delay; struct regulator_init_data *init_data; config = devm_kzalloc(dev, sizeof(struct fixed_voltage_config), GFP_KERNEL); if (!config) return ERR_PTR(-ENOMEM); config->init_data = of_get_regulator_init_data(dev, dev->of_node); if (!config->init_data) return ERR_PTR(-EINVAL); init_data = config->init_data; init_data->constraints.apply_uV = 0; config->supply_name = init_data->constraints.name; if (init_data->constraints.min_uV == init_data->constraints.max_uV) { config->microvolts = init_data->constraints.min_uV; } else { dev_err(dev, "Fixed regulator specified with variable voltages\n"); return ERR_PTR(-EINVAL); } if (init_data->constraints.boot_on) config->enabled_at_boot = true; config->gpio = of_get_named_gpio(np, "gpio", 0); /* * of_get_named_gpio() currently returns ENODEV rather than * EPROBE_DEFER. This code attempts to be compatible with both * for now; the ENODEV check can be removed once the API is fixed. * of_get_named_gpio() doesn't differentiate between a missing * property (which would be fine here, since the GPIO is optional) * and some other error. Patches have been posted for both issues. * Once they are check in, we should replace this with: * if (config->gpio < 0 && config->gpio != -ENOENT) */ if ((config->gpio == -ENODEV) || (config->gpio == -EPROBE_DEFER)) return ERR_PTR(-EPROBE_DEFER); delay = of_get_property(np, "startup-delay-us", NULL); if (delay) config->startup_delay = be32_to_cpu(*delay); if (of_find_property(np, "enable-active-high", NULL)) config->enable_high = true; if (of_find_property(np, "gpio-open-drain", NULL)) config->gpio_is_open_drain = true; if (of_find_property(np, "vin-supply", NULL)) config->input_supply = "vin"; return config; } static int fixed_voltage_get_voltage(struct regulator_dev *dev) { struct fixed_voltage_data *data = rdev_get_drvdata(dev); if (data->microvolts) return data->microvolts; else return -EINVAL; } static int fixed_voltage_list_voltage(struct regulator_dev *dev, unsigned selector) { struct fixed_voltage_data *data = rdev_get_drvdata(dev); if (selector != 0) return -EINVAL; return data->microvolts; } static struct regulator_ops fixed_voltage_ops = { .get_voltage = fixed_voltage_get_voltage, .list_voltage = fixed_voltage_list_voltage, }; static int __devinit reg_fixed_voltage_probe(struct platform_device *pdev) { struct fixed_voltage_config *config; struct fixed_voltage_data *drvdata; struct regulator_config cfg = { }; int ret; if (pdev->dev.of_node) { config = of_get_fixed_voltage_config(&pdev->dev); if (IS_ERR(config)) return PTR_ERR(config); } else { config = pdev->dev.platform_data; } if (!config) return -ENOMEM; drvdata = devm_kzalloc(&pdev->dev, sizeof(struct fixed_voltage_data), GFP_KERNEL); if (drvdata == NULL) { dev_err(&pdev->dev, "Failed to allocate device data\n"); ret = -ENOMEM; goto err; } drvdata->desc.name = kstrdup(config->supply_name, GFP_KERNEL); if (drvdata->desc.name == NULL) { dev_err(&pdev->dev, "Failed to allocate supply name\n"); ret = -ENOMEM; goto err; } drvdata->desc.type = REGULATOR_VOLTAGE; drvdata->desc.owner = THIS_MODULE; drvdata->desc.ops = &fixed_voltage_ops; drvdata->desc.enable_time = config->startup_delay; if (config->input_supply) { drvdata->desc.supply_name = kstrdup(config->input_supply, GFP_KERNEL); if (!drvdata->desc.supply_name) { dev_err(&pdev->dev, "Failed to allocate input supply\n"); ret = -ENOMEM; goto err_name; } } if (config->microvolts) drvdata->desc.n_voltages = 1; drvdata->microvolts = config->microvolts; if (config->gpio >= 0) cfg.ena_gpio = config->gpio; cfg.ena_gpio_invert = !config->enable_high; if (config->enabled_at_boot) { if (config->enable_high) { cfg.ena_gpio_flags |= GPIOF_OUT_INIT_HIGH; } else { cfg.ena_gpio_flags |= GPIOF_OUT_INIT_LOW; } } else { if (config->enable_high) { cfg.ena_gpio_flags |= GPIOF_OUT_INIT_LOW; } else { cfg.ena_gpio_flags |= GPIOF_OUT_INIT_HIGH; } } if (config->gpio_is_open_drain) cfg.ena_gpio_flags |= GPIOF_OPEN_DRAIN; cfg.dev = &pdev->dev; cfg.init_data = config->init_data; cfg.driver_data = drvdata; cfg.of_node = pdev->dev.of_node; drvdata->dev = regulator_register(&drvdata->desc, &cfg); if (IS_ERR(drvdata->dev)) { ret = PTR_ERR(drvdata->dev); dev_err(&pdev->dev, "Failed to register regulator: %d\n", ret); goto err_input; } platform_set_drvdata(pdev, drvdata); dev_dbg(&pdev->dev, "%s supplying %duV\n", drvdata->desc.name, drvdata->microvolts); return 0; err_input: kfree(drvdata->desc.supply_name); err_name: kfree(drvdata->desc.name); err: return ret; } static int __devexit reg_fixed_voltage_remove(struct platform_device *pdev) { struct fixed_voltage_data *drvdata = platform_get_drvdata(pdev); regulator_unregister(drvdata->dev); kfree(drvdata->desc.supply_name); kfree(drvdata->desc.name); return 0; } #if defined(CONFIG_OF) static const struct of_device_id fixed_of_match[] __devinitconst = { { .compatible = "regulator-fixed", }, {}, }; MODULE_DEVICE_TABLE(of, fixed_of_match); #endif static struct platform_driver regulator_fixed_voltage_driver = { .probe = reg_fixed_voltage_probe, .remove = __devexit_p(reg_fixed_voltage_remove), .driver = { .name = "reg-fixed-voltage", .owner = THIS_MODULE, .of_match_table = of_match_ptr(fixed_of_match), }, }; static int __init regulator_fixed_voltage_init(void) { return platform_driver_register(&regulator_fixed_voltage_driver); } subsys_initcall(regulator_fixed_voltage_init); static void __exit regulator_fixed_voltage_exit(void) { platform_driver_unregister(&regulator_fixed_voltage_driver); } module_exit(regulator_fixed_voltage_exit); MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); MODULE_DESCRIPTION("Fixed voltage regulator"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:reg-fixed-voltage");


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