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(). ... --- fs/squashfs/super.c | 681 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 681 insertions(+) create mode 100644 fs/squashfs/super.c (limited to 'fs/squashfs/super.c') diff --git a/fs/squashfs/super.c b/fs/squashfs/super.c new file mode 100644 index 000000000..e090fae48 --- /dev/null +++ b/fs/squashfs/super.c @@ -0,0 +1,681 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Squashfs - a compressed read only filesystem for Linux + * + * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008 + * Phillip Lougher + * + * super.c + */ + +/* + * This file implements code to read the superblock, read and initialise + * in-memory structures at mount time, and all the VFS glue code to register + * the filesystem. + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "squashfs_fs.h" +#include "squashfs_fs_sb.h" +#include "squashfs_fs_i.h" +#include "squashfs.h" +#include "decompressor.h" +#include "xattr.h" + +static struct file_system_type squashfs_fs_type; +static const struct super_operations squashfs_super_ops; + +enum Opt_errors { + Opt_errors_continue, + Opt_errors_panic, +}; + +enum squashfs_param { + Opt_errors, + Opt_threads, +}; + +struct squashfs_mount_opts { + enum Opt_errors errors; + const struct squashfs_decompressor_thread_ops *thread_ops; + int thread_num; +}; + +static const struct constant_table squashfs_param_errors[] = { + {"continue", Opt_errors_continue }, + {"panic", Opt_errors_panic }, + {} +}; + +static const struct fs_parameter_spec squashfs_fs_parameters[] = { + fsparam_enum("errors", Opt_errors, squashfs_param_errors), + fsparam_string("threads", Opt_threads), + {} +}; + + +static int squashfs_parse_param_threads_str(const char *str, struct squashfs_mount_opts *opts) +{ +#ifdef CONFIG_SQUASHFS_CHOICE_DECOMP_BY_MOUNT + if (strcmp(str, "single") == 0) { + opts->thread_ops = &squashfs_decompressor_single; + return 0; + } + if (strcmp(str, "multi") == 0) { + opts->thread_ops = &squashfs_decompressor_multi; + return 0; + } + if (strcmp(str, "percpu") == 0) { + opts->thread_ops = &squashfs_decompressor_percpu; + return 0; + } +#endif + return -EINVAL; +} + +static int squashfs_parse_param_threads_num(const char *str, struct squashfs_mount_opts *opts) +{ +#ifdef CONFIG_SQUASHFS_MOUNT_DECOMP_THREADS + int ret; + unsigned long num; + + ret = kstrtoul(str, 0, &num); + if (ret != 0) + return -EINVAL; + if (num > 1) { + opts->thread_ops = &squashfs_decompressor_multi; + if (num > opts->thread_ops->max_decompressors()) + return -EINVAL; + opts->thread_num = (int)num; + return 0; + } +#ifdef CONFIG_SQUASHFS_DECOMP_SINGLE + if (num == 1) { + opts->thread_ops = &squashfs_decompressor_single; + opts->thread_num = 1; + return 0; + } +#endif +#endif /* !CONFIG_SQUASHFS_MOUNT_DECOMP_THREADS */ + return -EINVAL; +} + +static int squashfs_parse_param_threads(const char *str, struct squashfs_mount_opts *opts) +{ + int ret = squashfs_parse_param_threads_str(str, opts); + + if (ret == 0) + return ret; + return squashfs_parse_param_threads_num(str, opts); +} + +static int squashfs_parse_param(struct fs_context *fc, struct fs_parameter *param) +{ + struct squashfs_mount_opts *opts = fc->fs_private; + struct fs_parse_result result; + int opt; + + opt = fs_parse(fc, squashfs_fs_parameters, param, &result); + if (opt < 0) + return opt; + + switch (opt) { + case Opt_errors: + opts->errors = result.uint_32; + break; + case Opt_threads: + if (squashfs_parse_param_threads(param->string, opts) != 0) + return -EINVAL; + break; + default: + return -EINVAL; + } + + return 0; +} + +static const struct squashfs_decompressor *supported_squashfs_filesystem( + struct fs_context *fc, + short major, short minor, short id) +{ + const struct squashfs_decompressor *decompressor; + + if (major < SQUASHFS_MAJOR) { + errorf(fc, "Major/Minor mismatch, older Squashfs %d.%d " + "filesystems are unsupported", major, minor); + return NULL; + } else if (major > SQUASHFS_MAJOR || minor > SQUASHFS_MINOR) { + errorf(fc, "Major/Minor mismatch, trying to mount newer " + "%d.%d filesystem", major, minor); + errorf(fc, "Please update your kernel"); + return NULL; + } + + decompressor = squashfs_lookup_decompressor(id); + if (!decompressor->supported) { + errorf(fc, "Filesystem uses \"%s\" compression. This is not supported", + decompressor->name); + return NULL; + } + + return decompressor; +} + + +static int squashfs_fill_super(struct super_block *sb, struct fs_context *fc) +{ + struct squashfs_mount_opts *opts = fc->fs_private; + struct squashfs_sb_info *msblk; + struct squashfs_super_block *sblk = NULL; + struct inode *root; + long long root_inode; + unsigned short flags; + unsigned int fragments; + u64 lookup_table_start, xattr_id_table_start, next_table; + int err; + + TRACE("Entered squashfs_fill_superblock\n"); + + sb->s_fs_info = kzalloc(sizeof(*msblk), GFP_KERNEL); + if (sb->s_fs_info == NULL) { + ERROR("Failed to allocate squashfs_sb_info\n"); + return -ENOMEM; + } + msblk = sb->s_fs_info; + msblk->thread_ops = opts->thread_ops; + + msblk->panic_on_errors = (opts->errors == Opt_errors_panic); + + msblk->devblksize = sb_min_blocksize(sb, SQUASHFS_DEVBLK_SIZE); + msblk->devblksize_log2 = ffz(~msblk->devblksize); + + mutex_init(&msblk->meta_index_mutex); + + /* + * msblk->bytes_used is checked in squashfs_read_table to ensure reads + * are not beyond filesystem end. But as we're using + * squashfs_read_table here to read the superblock (including the value + * of bytes_used) we need to set it to an initial sensible dummy value + */ + msblk->bytes_used = sizeof(*sblk); + sblk = squashfs_read_table(sb, SQUASHFS_START, sizeof(*sblk)); + + if (IS_ERR(sblk)) { + errorf(fc, "unable to read squashfs_super_block"); + err = PTR_ERR(sblk); + sblk = NULL; + goto failed_mount; + } + + err = -EINVAL; + + /* Check it is a SQUASHFS superblock */ + sb->s_magic = le32_to_cpu(sblk->s_magic); + if (sb->s_magic != SQUASHFS_MAGIC) { + if (!(fc->sb_flags & SB_SILENT)) + errorf(fc, "Can't find a SQUASHFS superblock on %pg", + sb->s_bdev); + goto failed_mount; + } + + if (opts->thread_num == 0) { + msblk->max_thread_num = msblk->thread_ops->max_decompressors(); + } else { + msblk->max_thread_num = opts->thread_num; + } + + /* Check the MAJOR & MINOR versions and lookup compression type */ + msblk->decompressor = supported_squashfs_filesystem( + fc, + le16_to_cpu(sblk->s_major), + le16_to_cpu(sblk->s_minor), + le16_to_cpu(sblk->compression)); + if (msblk->decompressor == NULL) + goto failed_mount; + + /* Check the filesystem does not extend beyond the end of the + block device */ + msblk->bytes_used = le64_to_cpu(sblk->bytes_used); + if (msblk->bytes_used < 0 || + msblk->bytes_used > bdev_nr_bytes(sb->s_bdev)) + goto failed_mount; + + /* Check block size for sanity */ + msblk->block_size = le32_to_cpu(sblk->block_size); + if (msblk->block_size > SQUASHFS_FILE_MAX_SIZE) + goto insanity; + + /* + * Check the system page size is not larger than the filesystem + * block size (by default 128K). This is currently not supported. + */ + if (PAGE_SIZE > msblk->block_size) { + errorf(fc, "Page size > filesystem block size (%d). This is " + "currently not supported!", msblk->block_size); + goto failed_mount; + } + + /* Check block log for sanity */ + msblk->block_log = le16_to_cpu(sblk->block_log); + if (msblk->block_log > SQUASHFS_FILE_MAX_LOG) + goto failed_mount; + + /* Check that block_size and block_log match */ + if (msblk->block_size != (1 << msblk->block_log)) + goto insanity; + + /* Check the root inode for sanity */ + root_inode = le64_to_cpu(sblk->root_inode); + if (SQUASHFS_INODE_OFFSET(root_inode) > SQUASHFS_METADATA_SIZE) + goto insanity; + + msblk->inode_table = le64_to_cpu(sblk->inode_table_start); + msblk->directory_table = le64_to_cpu(sblk->directory_table_start); + msblk->inodes = le32_to_cpu(sblk->inodes); + msblk->fragments = le32_to_cpu(sblk->fragments); + msblk->ids = le16_to_cpu(sblk->no_ids); + flags = le16_to_cpu(sblk->flags); + + TRACE("Found valid superblock on %pg\n", sb->s_bdev); + TRACE("Inodes are %scompressed\n", SQUASHFS_UNCOMPRESSED_INODES(flags) + ? "un" : ""); + TRACE("Data is %scompressed\n", SQUASHFS_UNCOMPRESSED_DATA(flags) + ? "un" : ""); + TRACE("Filesystem size %lld bytes\n", msblk->bytes_used); + TRACE("Block size %d\n", msblk->block_size); + TRACE("Number of inodes %d\n", msblk->inodes); + TRACE("Number of fragments %d\n", msblk->fragments); + TRACE("Number of ids %d\n", msblk->ids); + TRACE("sblk->inode_table_start %llx\n", msblk->inode_table); + TRACE("sblk->directory_table_start %llx\n", msblk->directory_table); + TRACE("sblk->fragment_table_start %llx\n", + (u64) le64_to_cpu(sblk->fragment_table_start)); + TRACE("sblk->id_table_start %llx\n", + (u64) le64_to_cpu(sblk->id_table_start)); + + sb->s_maxbytes = MAX_LFS_FILESIZE; + sb->s_time_min = 0; + sb->s_time_max = U32_MAX; + sb->s_flags |= SB_RDONLY; + sb->s_op = &squashfs_super_ops; + + err = -ENOMEM; + + msblk->block_cache = squashfs_cache_init("metadata", + SQUASHFS_CACHED_BLKS, SQUASHFS_METADATA_SIZE); + if (msblk->block_cache == NULL) + goto failed_mount; + + /* Allocate read_page block */ + msblk->read_page = squashfs_cache_init("data", + msblk->max_thread_num, msblk->block_size); + if (msblk->read_page == NULL) { + errorf(fc, "Failed to allocate read_page block"); + goto failed_mount; + } + + msblk->stream = squashfs_decompressor_setup(sb, flags); + if (IS_ERR(msblk->stream)) { + err = PTR_ERR(msblk->stream); + msblk->stream = NULL; + goto insanity; + } + + /* Handle xattrs */ + sb->s_xattr = squashfs_xattr_handlers; + xattr_id_table_start = le64_to_cpu(sblk->xattr_id_table_start); + if (xattr_id_table_start == SQUASHFS_INVALID_BLK) { + next_table = msblk->bytes_used; + goto allocate_id_index_table; + } + + /* Allocate and read xattr id lookup table */ + msblk->xattr_id_table = squashfs_read_xattr_id_table(sb, + xattr_id_table_start, &msblk->xattr_table, &msblk->xattr_ids); + if (IS_ERR(msblk->xattr_id_table)) { + errorf(fc, "unable to read xattr id index table"); + err = PTR_ERR(msblk->xattr_id_table); + msblk->xattr_id_table = NULL; + if (err != -ENOTSUPP) + goto failed_mount; + } + next_table = msblk->xattr_table; + +allocate_id_index_table: + /* Allocate and read id index table */ + msblk->id_table = squashfs_read_id_index_table(sb, + le64_to_cpu(sblk->id_table_start), next_table, msblk->ids); + if (IS_ERR(msblk->id_table)) { + errorf(fc, "unable to read id index table"); + err = PTR_ERR(msblk->id_table); + msblk->id_table = NULL; + goto failed_mount; + } + next_table = le64_to_cpu(msblk->id_table[0]); + + /* Handle inode lookup table */ + lookup_table_start = le64_to_cpu(sblk->lookup_table_start); + if (lookup_table_start == SQUASHFS_INVALID_BLK) + goto handle_fragments; + + /* Allocate and read inode lookup table */ + msblk->inode_lookup_table = squashfs_read_inode_lookup_table(sb, + lookup_table_start, next_table, msblk->inodes); + if (IS_ERR(msblk->inode_lookup_table)) { + errorf(fc, "unable to read inode lookup table"); + err = PTR_ERR(msblk->inode_lookup_table); + msblk->inode_lookup_table = NULL; + goto failed_mount; + } + next_table = le64_to_cpu(msblk->inode_lookup_table[0]); + + sb->s_export_op = &squashfs_export_ops; + +handle_fragments: + fragments = msblk->fragments; + if (fragments == 0) + goto check_directory_table; + + msblk->fragment_cache = squashfs_cache_init("fragment", + SQUASHFS_CACHED_FRAGMENTS, msblk->block_size); + if (msblk->fragment_cache == NULL) { + err = -ENOMEM; + goto failed_mount; + } + + /* Allocate and read fragment index table */ + msblk->fragment_index = squashfs_read_fragment_index_table(sb, + le64_to_cpu(sblk->fragment_table_start), next_table, fragments); + if (IS_ERR(msblk->fragment_index)) { + errorf(fc, "unable to read fragment index table"); + err = PTR_ERR(msblk->fragment_index); + msblk->fragment_index = NULL; + goto failed_mount; + } + next_table = le64_to_cpu(msblk->fragment_index[0]); + +check_directory_table: + /* Sanity check directory_table */ + if (msblk->directory_table > next_table) { + err = -EINVAL; + goto insanity; + } + + /* Sanity check inode_table */ + if (msblk->inode_table >= msblk->directory_table) { + err = -EINVAL; + goto insanity; + } + + /* allocate root */ + root = new_inode(sb); + if (!root) { + err = -ENOMEM; + goto failed_mount; + } + + err = squashfs_read_inode(root, root_inode); + if (err) { + make_bad_inode(root); + iput(root); + goto failed_mount; + } + insert_inode_hash(root); + + sb->s_root = d_make_root(root); + if (sb->s_root == NULL) { + ERROR("Root inode create failed\n"); + err = -ENOMEM; + goto failed_mount; + } + + TRACE("Leaving squashfs_fill_super\n"); + kfree(sblk); + return 0; + +insanity: + errorf(fc, "squashfs image failed sanity check"); +failed_mount: + squashfs_cache_delete(msblk->block_cache); + squashfs_cache_delete(msblk->fragment_cache); + squashfs_cache_delete(msblk->read_page); + msblk->thread_ops->destroy(msblk); + kfree(msblk->inode_lookup_table); + kfree(msblk->fragment_index); + kfree(msblk->id_table); + kfree(msblk->xattr_id_table); + kfree(sb->s_fs_info); + sb->s_fs_info = NULL; + kfree(sblk); + return err; +} + +static int squashfs_get_tree(struct fs_context *fc) +{ + return get_tree_bdev(fc, squashfs_fill_super); +} + +static int squashfs_reconfigure(struct fs_context *fc) +{ + struct super_block *sb = fc->root->d_sb; + struct squashfs_sb_info *msblk = sb->s_fs_info; + struct squashfs_mount_opts *opts = fc->fs_private; + + sync_filesystem(fc->root->d_sb); + fc->sb_flags |= SB_RDONLY; + + msblk->panic_on_errors = (opts->errors == Opt_errors_panic); + + return 0; +} + +static void squashfs_free_fs_context(struct fs_context *fc) +{ + kfree(fc->fs_private); +} + +static const struct fs_context_operations squashfs_context_ops = { + .get_tree = squashfs_get_tree, + .free = squashfs_free_fs_context, + .parse_param = squashfs_parse_param, + .reconfigure = squashfs_reconfigure, +}; + +static int squashfs_show_options(struct seq_file *s, struct dentry *root) +{ + struct super_block *sb = root->d_sb; + struct squashfs_sb_info *msblk = sb->s_fs_info; + + if (msblk->panic_on_errors) + seq_puts(s, ",errors=panic"); + else + seq_puts(s, ",errors=continue"); + +#ifdef CONFIG_SQUASHFS_CHOICE_DECOMP_BY_MOUNT + if (msblk->thread_ops == &squashfs_decompressor_single) { + seq_puts(s, ",threads=single"); + return 0; + } + if (msblk->thread_ops == &squashfs_decompressor_percpu) { + seq_puts(s, ",threads=percpu"); + return 0; + } +#endif +#ifdef CONFIG_SQUASHFS_MOUNT_DECOMP_THREADS + seq_printf(s, ",threads=%d", msblk->max_thread_num); +#endif + return 0; +} + +static int squashfs_init_fs_context(struct fs_context *fc) +{ + struct squashfs_mount_opts *opts; + + opts = kzalloc(sizeof(*opts), GFP_KERNEL); + if (!opts) + return -ENOMEM; + +#ifdef CONFIG_SQUASHFS_DECOMP_SINGLE + opts->thread_ops = &squashfs_decompressor_single; +#elif defined(CONFIG_SQUASHFS_DECOMP_MULTI) + opts->thread_ops = &squashfs_decompressor_multi; +#elif defined(CONFIG_SQUASHFS_DECOMP_MULTI_PERCPU) + opts->thread_ops = &squashfs_decompressor_percpu; +#else +#error "fail: unknown squashfs decompression thread mode?" +#endif + opts->thread_num = 0; + fc->fs_private = opts; + fc->ops = &squashfs_context_ops; + return 0; +} + +static int squashfs_statfs(struct dentry *dentry, struct kstatfs *buf) +{ + struct squashfs_sb_info *msblk = dentry->d_sb->s_fs_info; + u64 id = huge_encode_dev(dentry->d_sb->s_bdev->bd_dev); + + TRACE("Entered squashfs_statfs\n"); + + buf->f_type = SQUASHFS_MAGIC; + buf->f_bsize = msblk->block_size; + buf->f_blocks = ((msblk->bytes_used - 1) >> msblk->block_log) + 1; + buf->f_bfree = buf->f_bavail = 0; + buf->f_files = msblk->inodes; + buf->f_ffree = 0; + buf->f_namelen = SQUASHFS_NAME_LEN; + buf->f_fsid = u64_to_fsid(id); + + return 0; +} + + +static void squashfs_put_super(struct super_block *sb) +{ + if (sb->s_fs_info) { + struct squashfs_sb_info *sbi = sb->s_fs_info; + squashfs_cache_delete(sbi->block_cache); + squashfs_cache_delete(sbi->fragment_cache); + squashfs_cache_delete(sbi->read_page); + sbi->thread_ops->destroy(sbi); + kfree(sbi->id_table); + kfree(sbi->fragment_index); + kfree(sbi->meta_index); + kfree(sbi->inode_lookup_table); + kfree(sbi->xattr_id_table); + kfree(sb->s_fs_info); + sb->s_fs_info = NULL; + } +} + +static struct kmem_cache *squashfs_inode_cachep; + + +static void init_once(void *foo) +{ + struct squashfs_inode_info *ei = foo; + + inode_init_once(&ei->vfs_inode); +} + + +static int __init init_inodecache(void) +{ + squashfs_inode_cachep = kmem_cache_create("squashfs_inode_cache", + sizeof(struct squashfs_inode_info), 0, + SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|SLAB_ACCOUNT, + init_once); + + return squashfs_inode_cachep ? 0 : -ENOMEM; +} + + +static void destroy_inodecache(void) +{ + /* + * Make sure all delayed rcu free inodes are flushed before we + * destroy cache. + */ + rcu_barrier(); + kmem_cache_destroy(squashfs_inode_cachep); +} + + +static int __init init_squashfs_fs(void) +{ + int err = init_inodecache(); + + if (err) + return err; + + err = register_filesystem(&squashfs_fs_type); + if (err) { + destroy_inodecache(); + return err; + } + + pr_info("version 4.0 (2009/01/31) Phillip Lougher\n"); + + return 0; +} + + +static void __exit exit_squashfs_fs(void) +{ + unregister_filesystem(&squashfs_fs_type); + destroy_inodecache(); +} + + +static struct inode *squashfs_alloc_inode(struct super_block *sb) +{ + struct squashfs_inode_info *ei = + alloc_inode_sb(sb, squashfs_inode_cachep, GFP_KERNEL); + + return ei ? &ei->vfs_inode : NULL; +} + + +static void squashfs_free_inode(struct inode *inode) +{ + kmem_cache_free(squashfs_inode_cachep, squashfs_i(inode)); +} + +static struct file_system_type squashfs_fs_type = { + .owner = THIS_MODULE, + .name = "squashfs", + .init_fs_context = squashfs_init_fs_context, + .parameters = squashfs_fs_parameters, + .kill_sb = kill_block_super, + .fs_flags = FS_REQUIRES_DEV | FS_ALLOW_IDMAP, +}; +MODULE_ALIAS_FS("squashfs"); + +static const struct super_operations squashfs_super_ops = { + .alloc_inode = squashfs_alloc_inode, + .free_inode = squashfs_free_inode, + .statfs = squashfs_statfs, + .put_super = squashfs_put_super, + .show_options = squashfs_show_options, +}; + +module_init(init_squashfs_fs); +module_exit(exit_squashfs_fs); +MODULE_DESCRIPTION("squashfs 4.0, a compressed read-only filesystem"); +MODULE_AUTHOR("Phillip Lougher "); +MODULE_LICENSE("GPL"); -- cgit v1.2.3