From 5b7c4cabbb65f5c469464da6c5f614cbd7f730f2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Tue, 21 Feb 2023 18:24:12 -0800 Subject: Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next Pull networking updates from Jakub Kicinski: "Core: - Add dedicated kmem_cache for typical/small skb->head, avoid having to access struct page at kfree time, and improve memory use. - Introduce sysctl to set default RPS configuration for new netdevs. - Define Netlink protocol specification format which can be used to describe messages used by each family and auto-generate parsers. Add tools for generating kernel data structures and uAPI headers. - Expose all net/core sysctls inside netns. - Remove 4s sleep in netpoll if carrier is instantly detected on boot. - Add configurable limit of MDB entries per port, and port-vlan. - Continue populating drop reasons throughout the stack. - Retire a handful of legacy Qdiscs and classifiers. Protocols: - Support IPv4 big TCP (TSO frames larger than 64kB). - Add IP_LOCAL_PORT_RANGE socket option, to control local port range on socket by socket basis. - Track and report in procfs number of MPTCP sockets used. - Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path manager. - IPv6: don't check net.ipv6.route.max_size and rely on garbage collection to free memory (similarly to IPv4). - Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986). - ICMP: add per-rate limit counters. - Add support for user scanning requests in ieee802154. - Remove static WEP support. - Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate reporting. - WiFi 7 EHT channel puncturing support (client & AP). BPF: - Add a rbtree data structure following the "next-gen data structure" precedent set by recently added linked list, that is, by using kfunc + kptr instead of adding a new BPF map type. - Expose XDP hints via kfuncs with initial support for RX hash and timestamp metadata. - Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to better support decap on GRE tunnel devices not operating in collect metadata. - Improve x86 JIT's codegen for PROBE_MEM runtime error checks. - Remove the need for trace_printk_lock for bpf_trace_printk and bpf_trace_vprintk helpers. - Extend libbpf's bpf_tracing.h support for tracing arguments of kprobes/uprobes and syscall as a special case. - Significantly reduce the search time for module symbols by livepatch and BPF. - Enable cpumasks to be used as kptrs, which is useful for tracing programs tracking which tasks end up running on which CPUs in different time intervals. - Add support for BPF trampoline on s390x and riscv64. - Add capability to export the XDP features supported by the NIC. - Add __bpf_kfunc tag for marking kernel functions as kfuncs. - Add cgroup.memory=nobpf kernel parameter option to disable BPF memory accounting for container environments. Netfilter: - Remove the CLUSTERIP target. It has been marked as obsolete for years, and we still have WARN splats wrt races of the out-of-band /proc interface installed by this target. - Add 'destroy' commands to nf_tables. They are identical to the existing 'delete' commands, but do not return an error if the referenced object (set, chain, rule...) did not exist. Driver API: - Improve cpumask_local_spread() locality to help NICs set the right IRQ affinity on AMD platforms. - Separate C22 and C45 MDIO bus transactions more clearly. - Introduce new DCB table to control DSCP rewrite on egress. - Support configuration of Physical Layer Collision Avoidance (PLCA) Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of shared medium Ethernet. - Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing preemption of low priority frames by high priority frames. - Add support for controlling MACSec offload using netlink SET. - Rework devlink instance refcounts to allow registration and de-registration under the instance lock. Split the code into multiple files, drop some of the unnecessarily granular locks and factor out common parts of netlink operation handling. - Add TX frame aggregation parameters (for USB drivers). - Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning messages with notifications for debug. - Allow offloading of UDP NEW connections via act_ct. - Add support for per action HW stats in TC. - Support hardware miss to TC action (continue processing in SW from a specific point in the action chain). - Warn if old Wireless Extension user space interface is used with modern cfg80211/mac80211 drivers. Do not support Wireless Extensions for Wi-Fi 7 devices at all. Everyone should switch to using nl80211 interface instead. - Improve the CAN bit timing configuration. Use extack to return error messages directly to user space, update the SJW handling, including the definition of a new default value that will benefit CAN-FD controllers, by increasing their oscillator tolerance. New hardware / drivers: - Ethernet: - nVidia BlueField-3 support (control traffic driver) - Ethernet support for imx93 SoCs - Motorcomm yt8531 gigabit Ethernet PHY - onsemi NCN26000 10BASE-T1S PHY (with support for PLCA) - Microchip LAN8841 PHY (incl. cable diagnostics and PTP) - Amlogic gxl MDIO mux - WiFi: - RealTek RTL8188EU (rtl8xxxu) - Qualcomm Wi-Fi 7 devices (ath12k) - CAN: - Renesas R-Car V4H Drivers: - Bluetooth: - Set Per Platform Antenna Gain (PPAG) for Intel controllers. - Ethernet NICs: - Intel (1G, igc): - support TSN / Qbv / packet scheduling features of i226 model - Intel (100G, ice): - use GNSS subsystem instead of TTY - multi-buffer XDP support - extend support for GPIO pins to E823 devices - nVidia/Mellanox: - update the shared buffer configuration on PFC commands - implement PTP adjphase function for HW offset control - TC support for Geneve and GRE with VF tunnel offload - more efficient crypto key management method - multi-port eswitch support - Netronome/Corigine: - add DCB IEEE support - support IPsec offloading for NFP3800 - Freescale/NXP (enetc): - support XDP_REDIRECT for XDP non-linear buffers - improve reconfig, avoid link flap and waiting for idle - support MAC Merge layer - Other NICs: - sfc/ef100: add basic devlink support for ef100 - ionic: rx_push mode operation (writing descriptors via MMIO) - bnxt: use the auxiliary bus abstraction for RDMA - r8169: disable ASPM and reset bus in case of tx timeout - cpsw: support QSGMII mode for J721e CPSW9G - cpts: support pulse-per-second output - ngbe: add an mdio bus driver - usbnet: optimize usbnet_bh() by avoiding unnecessary queuing - r8152: handle devices with FW with NCM support - amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation - virtio-net: support multi buffer XDP - virtio/vsock: replace virtio_vsock_pkt with sk_buff - tsnep: XDP support - Ethernet high-speed switches: - nVidia/Mellanox (mlxsw): - add support for latency TLV (in FW control messages) - Microchip (sparx5): - separate explicit and implicit traffic forwarding rules, make the implicit rules always active - add support for egress DSCP rewrite - IS0 VCAP support (Ingress Classification) - IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS etc.) - ES2 VCAP support (Egress Access Control) - support for Per-Stream Filtering and Policing (802.1Q, 8.6.5.1) - Ethernet embedded switches: - Marvell (mv88e6xxx): - add MAB (port auth) offload support - enable PTP receive for mv88e6390 - NXP (ocelot): - support MAC Merge layer - support for the the vsc7512 internal copper phys - Microchip: - lan9303: convert to PHYLINK - lan966x: support TC flower filter statistics - lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x - lan937x: support Credit Based Shaper configuration - ksz9477: support Energy Efficient Ethernet - other: - qca8k: convert to regmap read/write API, use bulk operations - rswitch: Improve TX timestamp accuracy - Intel WiFi (iwlwifi): - EHT (Wi-Fi 7) rate reporting - STEP equalizer support: transfer some STEP (connection to radio on platforms with integrated wifi) related parameters from the BIOS to the firmware. - Qualcomm 802.11ax WiFi (ath11k): - IPQ5018 support - Fine Timing Measurement (FTM) responder role support - channel 177 support - MediaTek WiFi (mt76): - per-PHY LED support - mt7996: EHT (Wi-Fi 7) support - Wireless Ethernet Dispatch (WED) reset support - switch to using page pool allocator - RealTek WiFi (rtw89): - support new version of Bluetooth co-existance - Mobile: - rmnet: support TX aggregation" * tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits) page_pool: add a comment explaining the fragment counter usage net: ethtool: fix __ethtool_dev_mm_supported() implementation ethtool: pse-pd: Fix double word in comments xsk: add linux/vmalloc.h to xsk.c sefltests: netdevsim: wait for devlink instance after netns removal selftest: fib_tests: Always cleanup before exit net/mlx5e: Align IPsec ASO result memory to be as required by hardware net/mlx5e: TC, Set CT miss to the specific ct action instance net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG net/mlx5: Refactor tc miss handling to a single function net/mlx5: Kconfig: Make tc offload depend on tc skb extension net/sched: flower: Support hardware miss to tc action net/sched: flower: Move filter handle initialization earlier net/sched: cls_api: Support hardware miss to tc action net/sched: Rename user cookie and act cookie sfc: fix builds without CONFIG_RTC_LIB sfc: clean up some inconsistent indentings net/mlx4_en: Introduce flexible array to silence overflow warning net: lan966x: Fix possible deadlock inside PTP net/ulp: Remove redundant ->clone() test in inet_clone_ulp(). ... --- drivers/usb/gadget/function/storage_common.c | 540 +++++++++++++++++++++++++++ 1 file changed, 540 insertions(+) create mode 100644 drivers/usb/gadget/function/storage_common.c (limited to 'drivers/usb/gadget/function/storage_common.c') diff --git a/drivers/usb/gadget/function/storage_common.c b/drivers/usb/gadget/function/storage_common.c new file mode 100644 index 000000000..2a4163b0f --- /dev/null +++ b/drivers/usb/gadget/function/storage_common.c @@ -0,0 +1,540 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * storage_common.c -- Common definitions for mass storage functionality + * + * Copyright (C) 2003-2008 Alan Stern + * Copyeight (C) 2009 Samsung Electronics + * Author: Michal Nazarewicz (mina86@mina86.com) + */ + +/* + * This file requires the following identifiers used in USB strings to + * be defined (each of type pointer to char): + * - fsg_string_interface -- name of the interface + */ + +/* + * When USB_GADGET_DEBUG_FILES is defined the module param num_buffers + * sets the number of pipeline buffers (length of the fsg_buffhd array). + * The valid range of num_buffers is: num >= 2 && num <= 4. + */ + +#include +#include +#include +#include +#include +#include + +#include "storage_common.h" + +/* There is only one interface. */ + +struct usb_interface_descriptor fsg_intf_desc = { + .bLength = sizeof fsg_intf_desc, + .bDescriptorType = USB_DT_INTERFACE, + + .bNumEndpoints = 2, /* Adjusted during fsg_bind() */ + .bInterfaceClass = USB_CLASS_MASS_STORAGE, + .bInterfaceSubClass = USB_SC_SCSI, /* Adjusted during fsg_bind() */ + .bInterfaceProtocol = USB_PR_BULK, /* Adjusted during fsg_bind() */ + .iInterface = FSG_STRING_INTERFACE, +}; +EXPORT_SYMBOL_GPL(fsg_intf_desc); + +/* + * Three full-speed endpoint descriptors: bulk-in, bulk-out, and + * interrupt-in. + */ + +struct usb_endpoint_descriptor fsg_fs_bulk_in_desc = { + .bLength = USB_DT_ENDPOINT_SIZE, + .bDescriptorType = USB_DT_ENDPOINT, + + .bEndpointAddress = USB_DIR_IN, + .bmAttributes = USB_ENDPOINT_XFER_BULK, + /* wMaxPacketSize set by autoconfiguration */ +}; +EXPORT_SYMBOL_GPL(fsg_fs_bulk_in_desc); + +struct usb_endpoint_descriptor fsg_fs_bulk_out_desc = { + .bLength = USB_DT_ENDPOINT_SIZE, + .bDescriptorType = USB_DT_ENDPOINT, + + .bEndpointAddress = USB_DIR_OUT, + .bmAttributes = USB_ENDPOINT_XFER_BULK, + /* wMaxPacketSize set by autoconfiguration */ +}; +EXPORT_SYMBOL_GPL(fsg_fs_bulk_out_desc); + +struct usb_descriptor_header *fsg_fs_function[] = { + (struct usb_descriptor_header *) &fsg_intf_desc, + (struct usb_descriptor_header *) &fsg_fs_bulk_in_desc, + (struct usb_descriptor_header *) &fsg_fs_bulk_out_desc, + NULL, +}; +EXPORT_SYMBOL_GPL(fsg_fs_function); + + +/* + * USB 2.0 devices need to expose both high speed and full speed + * descriptors, unless they only run at full speed. + * + * That means alternate endpoint descriptors (bigger packets). + */ +struct usb_endpoint_descriptor fsg_hs_bulk_in_desc = { + .bLength = USB_DT_ENDPOINT_SIZE, + .bDescriptorType = USB_DT_ENDPOINT, + + /* bEndpointAddress copied from fs_bulk_in_desc during fsg_bind() */ + .bmAttributes = USB_ENDPOINT_XFER_BULK, + .wMaxPacketSize = cpu_to_le16(512), +}; +EXPORT_SYMBOL_GPL(fsg_hs_bulk_in_desc); + +struct usb_endpoint_descriptor fsg_hs_bulk_out_desc = { + .bLength = USB_DT_ENDPOINT_SIZE, + .bDescriptorType = USB_DT_ENDPOINT, + + /* bEndpointAddress copied from fs_bulk_out_desc during fsg_bind() */ + .bmAttributes = USB_ENDPOINT_XFER_BULK, + .wMaxPacketSize = cpu_to_le16(512), + .bInterval = 1, /* NAK every 1 uframe */ +}; +EXPORT_SYMBOL_GPL(fsg_hs_bulk_out_desc); + + +struct usb_descriptor_header *fsg_hs_function[] = { + (struct usb_descriptor_header *) &fsg_intf_desc, + (struct usb_descriptor_header *) &fsg_hs_bulk_in_desc, + (struct usb_descriptor_header *) &fsg_hs_bulk_out_desc, + NULL, +}; +EXPORT_SYMBOL_GPL(fsg_hs_function); + +struct usb_endpoint_descriptor fsg_ss_bulk_in_desc = { + .bLength = USB_DT_ENDPOINT_SIZE, + .bDescriptorType = USB_DT_ENDPOINT, + + /* bEndpointAddress copied from fs_bulk_in_desc during fsg_bind() */ + .bmAttributes = USB_ENDPOINT_XFER_BULK, + .wMaxPacketSize = cpu_to_le16(1024), +}; +EXPORT_SYMBOL_GPL(fsg_ss_bulk_in_desc); + +struct usb_ss_ep_comp_descriptor fsg_ss_bulk_in_comp_desc = { + .bLength = sizeof(fsg_ss_bulk_in_comp_desc), + .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, + + /*.bMaxBurst = DYNAMIC, */ +}; +EXPORT_SYMBOL_GPL(fsg_ss_bulk_in_comp_desc); + +struct usb_endpoint_descriptor fsg_ss_bulk_out_desc = { + .bLength = USB_DT_ENDPOINT_SIZE, + .bDescriptorType = USB_DT_ENDPOINT, + + /* bEndpointAddress copied from fs_bulk_out_desc during fsg_bind() */ + .bmAttributes = USB_ENDPOINT_XFER_BULK, + .wMaxPacketSize = cpu_to_le16(1024), +}; +EXPORT_SYMBOL_GPL(fsg_ss_bulk_out_desc); + +struct usb_ss_ep_comp_descriptor fsg_ss_bulk_out_comp_desc = { + .bLength = sizeof(fsg_ss_bulk_in_comp_desc), + .bDescriptorType = USB_DT_SS_ENDPOINT_COMP, + + /*.bMaxBurst = DYNAMIC, */ +}; +EXPORT_SYMBOL_GPL(fsg_ss_bulk_out_comp_desc); + +struct usb_descriptor_header *fsg_ss_function[] = { + (struct usb_descriptor_header *) &fsg_intf_desc, + (struct usb_descriptor_header *) &fsg_ss_bulk_in_desc, + (struct usb_descriptor_header *) &fsg_ss_bulk_in_comp_desc, + (struct usb_descriptor_header *) &fsg_ss_bulk_out_desc, + (struct usb_descriptor_header *) &fsg_ss_bulk_out_comp_desc, + NULL, +}; +EXPORT_SYMBOL_GPL(fsg_ss_function); + + + /*-------------------------------------------------------------------------*/ + +/* + * If the next two routines are called while the gadget is registered, + * the caller must own fsg->filesem for writing. + */ + +void fsg_lun_close(struct fsg_lun *curlun) +{ + if (curlun->filp) { + LDBG(curlun, "close backing file\n"); + fput(curlun->filp); + curlun->filp = NULL; + } +} +EXPORT_SYMBOL_GPL(fsg_lun_close); + +int fsg_lun_open(struct fsg_lun *curlun, const char *filename) +{ + int ro; + struct file *filp = NULL; + int rc = -EINVAL; + struct inode *inode = NULL; + loff_t size; + loff_t num_sectors; + loff_t min_sectors; + unsigned int blkbits; + unsigned int blksize; + + /* R/W if we can, R/O if we must */ + ro = curlun->initially_ro; + if (!ro) { + filp = filp_open(filename, O_RDWR | O_LARGEFILE, 0); + if (PTR_ERR(filp) == -EROFS || PTR_ERR(filp) == -EACCES) + ro = 1; + } + if (ro) + filp = filp_open(filename, O_RDONLY | O_LARGEFILE, 0); + if (IS_ERR(filp)) { + LINFO(curlun, "unable to open backing file: %s\n", filename); + return PTR_ERR(filp); + } + + if (!(filp->f_mode & FMODE_WRITE)) + ro = 1; + + inode = filp->f_mapping->host; + if ((!S_ISREG(inode->i_mode) && !S_ISBLK(inode->i_mode))) { + LINFO(curlun, "invalid file type: %s\n", filename); + goto out; + } + + /* + * If we can't read the file, it's no good. + * If we can't write the file, use it read-only. + */ + if (!(filp->f_mode & FMODE_CAN_READ)) { + LINFO(curlun, "file not readable: %s\n", filename); + goto out; + } + if (!(filp->f_mode & FMODE_CAN_WRITE)) + ro = 1; + + size = i_size_read(inode); + if (size < 0) { + LINFO(curlun, "unable to find file size: %s\n", filename); + rc = (int) size; + goto out; + } + + if (curlun->cdrom) { + blksize = 2048; + blkbits = 11; + } else if (S_ISBLK(inode->i_mode)) { + blksize = bdev_logical_block_size(I_BDEV(inode)); + blkbits = blksize_bits(blksize); + } else { + blksize = 512; + blkbits = 9; + } + + num_sectors = size >> blkbits; /* File size in logic-block-size blocks */ + min_sectors = 1; + if (curlun->cdrom) { + min_sectors = 300; /* Smallest track is 300 frames */ + if (num_sectors >= 256*60*75) { + num_sectors = 256*60*75 - 1; + LINFO(curlun, "file too big: %s\n", filename); + LINFO(curlun, "using only first %d blocks\n", + (int) num_sectors); + } + } + if (num_sectors < min_sectors) { + LINFO(curlun, "file too small: %s\n", filename); + rc = -ETOOSMALL; + goto out; + } + + if (fsg_lun_is_open(curlun)) + fsg_lun_close(curlun); + + curlun->blksize = blksize; + curlun->blkbits = blkbits; + curlun->ro = ro; + curlun->filp = filp; + curlun->file_length = size; + curlun->num_sectors = num_sectors; + LDBG(curlun, "open backing file: %s\n", filename); + return 0; + +out: + fput(filp); + return rc; +} +EXPORT_SYMBOL_GPL(fsg_lun_open); + + +/*-------------------------------------------------------------------------*/ + +/* + * Sync the file data, don't bother with the metadata. + * This code was copied from fs/buffer.c:sys_fdatasync(). + */ +int fsg_lun_fsync_sub(struct fsg_lun *curlun) +{ + struct file *filp = curlun->filp; + + if (curlun->ro || !filp) + return 0; + return vfs_fsync(filp, 1); +} +EXPORT_SYMBOL_GPL(fsg_lun_fsync_sub); + +void store_cdrom_address(u8 *dest, int msf, u32 addr) +{ + if (msf) { + /* + * Convert to Minutes-Seconds-Frames. + * Sector size is already set to 2048 bytes. + */ + addr += 2*75; /* Lead-in occupies 2 seconds */ + dest[3] = addr % 75; /* Frames */ + addr /= 75; + dest[2] = addr % 60; /* Seconds */ + addr /= 60; + dest[1] = addr; /* Minutes */ + dest[0] = 0; /* Reserved */ + } else { + /* Absolute sector */ + put_unaligned_be32(addr, dest); + } +} +EXPORT_SYMBOL_GPL(store_cdrom_address); + +/*-------------------------------------------------------------------------*/ + + +ssize_t fsg_show_ro(struct fsg_lun *curlun, char *buf) +{ + return sprintf(buf, "%d\n", fsg_lun_is_open(curlun) + ? curlun->ro + : curlun->initially_ro); +} +EXPORT_SYMBOL_GPL(fsg_show_ro); + +ssize_t fsg_show_nofua(struct fsg_lun *curlun, char *buf) +{ + return sprintf(buf, "%u\n", curlun->nofua); +} +EXPORT_SYMBOL_GPL(fsg_show_nofua); + +ssize_t fsg_show_file(struct fsg_lun *curlun, struct rw_semaphore *filesem, + char *buf) +{ + char *p; + ssize_t rc; + + down_read(filesem); + if (fsg_lun_is_open(curlun)) { /* Get the complete pathname */ + p = file_path(curlun->filp, buf, PAGE_SIZE - 1); + if (IS_ERR(p)) + rc = PTR_ERR(p); + else { + rc = strlen(p); + memmove(buf, p, rc); + buf[rc] = '\n'; /* Add a newline */ + buf[++rc] = 0; + } + } else { /* No file, return 0 bytes */ + *buf = 0; + rc = 0; + } + up_read(filesem); + return rc; +} +EXPORT_SYMBOL_GPL(fsg_show_file); + +ssize_t fsg_show_cdrom(struct fsg_lun *curlun, char *buf) +{ + return sprintf(buf, "%u\n", curlun->cdrom); +} +EXPORT_SYMBOL_GPL(fsg_show_cdrom); + +ssize_t fsg_show_removable(struct fsg_lun *curlun, char *buf) +{ + return sprintf(buf, "%u\n", curlun->removable); +} +EXPORT_SYMBOL_GPL(fsg_show_removable); + +ssize_t fsg_show_inquiry_string(struct fsg_lun *curlun, char *buf) +{ + return sprintf(buf, "%s\n", curlun->inquiry_string); +} +EXPORT_SYMBOL_GPL(fsg_show_inquiry_string); + +/* + * The caller must hold fsg->filesem for reading when calling this function. + */ +static ssize_t _fsg_store_ro(struct fsg_lun *curlun, bool ro) +{ + if (fsg_lun_is_open(curlun)) { + LDBG(curlun, "read-only status change prevented\n"); + return -EBUSY; + } + + curlun->ro = ro; + curlun->initially_ro = ro; + LDBG(curlun, "read-only status set to %d\n", curlun->ro); + + return 0; +} + +ssize_t fsg_store_ro(struct fsg_lun *curlun, struct rw_semaphore *filesem, + const char *buf, size_t count) +{ + ssize_t rc; + bool ro; + + rc = kstrtobool(buf, &ro); + if (rc) + return rc; + + /* + * Allow the write-enable status to change only while the + * backing file is closed. + */ + down_read(filesem); + rc = _fsg_store_ro(curlun, ro); + if (!rc) + rc = count; + up_read(filesem); + + return rc; +} +EXPORT_SYMBOL_GPL(fsg_store_ro); + +ssize_t fsg_store_nofua(struct fsg_lun *curlun, const char *buf, size_t count) +{ + bool nofua; + int ret; + + ret = kstrtobool(buf, &nofua); + if (ret) + return ret; + + /* Sync data when switching from async mode to sync */ + if (!nofua && curlun->nofua) + fsg_lun_fsync_sub(curlun); + + curlun->nofua = nofua; + + return count; +} +EXPORT_SYMBOL_GPL(fsg_store_nofua); + +ssize_t fsg_store_file(struct fsg_lun *curlun, struct rw_semaphore *filesem, + const char *buf, size_t count) +{ + int rc = 0; + + if (curlun->prevent_medium_removal && fsg_lun_is_open(curlun)) { + LDBG(curlun, "eject attempt prevented\n"); + return -EBUSY; /* "Door is locked" */ + } + + /* Remove a trailing newline */ + if (count > 0 && buf[count-1] == '\n') + ((char *) buf)[count-1] = 0; /* Ugh! */ + + /* Load new medium */ + down_write(filesem); + if (count > 0 && buf[0]) { + /* fsg_lun_open() will close existing file if any. */ + rc = fsg_lun_open(curlun, buf); + if (rc == 0) + curlun->unit_attention_data = + SS_NOT_READY_TO_READY_TRANSITION; + } else if (fsg_lun_is_open(curlun)) { + fsg_lun_close(curlun); + curlun->unit_attention_data = SS_MEDIUM_NOT_PRESENT; + } + up_write(filesem); + return (rc < 0 ? rc : count); +} +EXPORT_SYMBOL_GPL(fsg_store_file); + +ssize_t fsg_store_cdrom(struct fsg_lun *curlun, struct rw_semaphore *filesem, + const char *buf, size_t count) +{ + bool cdrom; + int ret; + + ret = kstrtobool(buf, &cdrom); + if (ret) + return ret; + + down_read(filesem); + ret = cdrom ? _fsg_store_ro(curlun, true) : 0; + + if (!ret) { + curlun->cdrom = cdrom; + ret = count; + } + up_read(filesem); + + return ret; +} +EXPORT_SYMBOL_GPL(fsg_store_cdrom); + +ssize_t fsg_store_removable(struct fsg_lun *curlun, const char *buf, + size_t count) +{ + bool removable; + int ret; + + ret = kstrtobool(buf, &removable); + if (ret) + return ret; + + curlun->removable = removable; + + return count; +} +EXPORT_SYMBOL_GPL(fsg_store_removable); + +ssize_t fsg_store_inquiry_string(struct fsg_lun *curlun, const char *buf, + size_t count) +{ + const size_t len = min(count, sizeof(curlun->inquiry_string)); + + if (len == 0 || buf[0] == '\n') { + curlun->inquiry_string[0] = 0; + } else { + snprintf(curlun->inquiry_string, + sizeof(curlun->inquiry_string), "%-28s", buf); + if (curlun->inquiry_string[len-1] == '\n') + curlun->inquiry_string[len-1] = ' '; + } + + return count; +} +EXPORT_SYMBOL_GPL(fsg_store_inquiry_string); + +ssize_t fsg_store_forced_eject(struct fsg_lun *curlun, struct rw_semaphore *filesem, + const char *buf, size_t count) +{ + int ret; + + /* + * Forcibly detach the backing file from the LUN + * regardless of whether the host has allowed it. + */ + curlun->prevent_medium_removal = 0; + ret = fsg_store_file(curlun, filesem, "", 0); + return ret < 0 ? ret : count; +} +EXPORT_SYMBOL_GPL(fsg_store_forced_eject); + +MODULE_LICENSE("GPL"); -- cgit v1.2.3