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/minix/inode.c | 724 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 724 insertions(+) create mode 100644 fs/minix/inode.c (limited to 'fs/minix/inode.c') diff --git a/fs/minix/inode.c b/fs/minix/inode.c new file mode 100644 index 000000000..e9fbb5303 --- /dev/null +++ b/fs/minix/inode.c @@ -0,0 +1,724 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * linux/fs/minix/inode.c + * + * Copyright (C) 1991, 1992 Linus Torvalds + * + * Copyright (C) 1996 Gertjan van Wingerde + * Minix V2 fs support. + * + * Modified for 680x0 by Andreas Schwab + * Updated to filesystem version 3 by Daniel Aragones + */ + +#include +#include "minix.h" +#include +#include +#include +#include +#include +#include + +static int minix_write_inode(struct inode *inode, + struct writeback_control *wbc); +static int minix_statfs(struct dentry *dentry, struct kstatfs *buf); +static int minix_remount (struct super_block * sb, int * flags, char * data); + +static void minix_evict_inode(struct inode *inode) +{ + truncate_inode_pages_final(&inode->i_data); + if (!inode->i_nlink) { + inode->i_size = 0; + minix_truncate(inode); + } + invalidate_inode_buffers(inode); + clear_inode(inode); + if (!inode->i_nlink) + minix_free_inode(inode); +} + +static void minix_put_super(struct super_block *sb) +{ + int i; + struct minix_sb_info *sbi = minix_sb(sb); + + if (!sb_rdonly(sb)) { + if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */ + sbi->s_ms->s_state = sbi->s_mount_state; + mark_buffer_dirty(sbi->s_sbh); + } + for (i = 0; i < sbi->s_imap_blocks; i++) + brelse(sbi->s_imap[i]); + for (i = 0; i < sbi->s_zmap_blocks; i++) + brelse(sbi->s_zmap[i]); + brelse (sbi->s_sbh); + kfree(sbi->s_imap); + sb->s_fs_info = NULL; + kfree(sbi); +} + +static struct kmem_cache * minix_inode_cachep; + +static struct inode *minix_alloc_inode(struct super_block *sb) +{ + struct minix_inode_info *ei; + ei = alloc_inode_sb(sb, minix_inode_cachep, GFP_KERNEL); + if (!ei) + return NULL; + return &ei->vfs_inode; +} + +static void minix_free_in_core_inode(struct inode *inode) +{ + kmem_cache_free(minix_inode_cachep, minix_i(inode)); +} + +static void init_once(void *foo) +{ + struct minix_inode_info *ei = (struct minix_inode_info *) foo; + + inode_init_once(&ei->vfs_inode); +} + +static int __init init_inodecache(void) +{ + minix_inode_cachep = kmem_cache_create("minix_inode_cache", + sizeof(struct minix_inode_info), + 0, (SLAB_RECLAIM_ACCOUNT| + SLAB_MEM_SPREAD|SLAB_ACCOUNT), + init_once); + if (minix_inode_cachep == NULL) + return -ENOMEM; + return 0; +} + +static void destroy_inodecache(void) +{ + /* + * Make sure all delayed rcu free inodes are flushed before we + * destroy cache. + */ + rcu_barrier(); + kmem_cache_destroy(minix_inode_cachep); +} + +static const struct super_operations minix_sops = { + .alloc_inode = minix_alloc_inode, + .free_inode = minix_free_in_core_inode, + .write_inode = minix_write_inode, + .evict_inode = minix_evict_inode, + .put_super = minix_put_super, + .statfs = minix_statfs, + .remount_fs = minix_remount, +}; + +static int minix_remount (struct super_block * sb, int * flags, char * data) +{ + struct minix_sb_info * sbi = minix_sb(sb); + struct minix_super_block * ms; + + sync_filesystem(sb); + ms = sbi->s_ms; + if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb)) + return 0; + if (*flags & SB_RDONLY) { + if (ms->s_state & MINIX_VALID_FS || + !(sbi->s_mount_state & MINIX_VALID_FS)) + return 0; + /* Mounting a rw partition read-only. */ + if (sbi->s_version != MINIX_V3) + ms->s_state = sbi->s_mount_state; + mark_buffer_dirty(sbi->s_sbh); + } else { + /* Mount a partition which is read-only, read-write. */ + if (sbi->s_version != MINIX_V3) { + sbi->s_mount_state = ms->s_state; + ms->s_state &= ~MINIX_VALID_FS; + } else { + sbi->s_mount_state = MINIX_VALID_FS; + } + mark_buffer_dirty(sbi->s_sbh); + + if (!(sbi->s_mount_state & MINIX_VALID_FS)) + printk("MINIX-fs warning: remounting unchecked fs, " + "running fsck is recommended\n"); + else if ((sbi->s_mount_state & MINIX_ERROR_FS)) + printk("MINIX-fs warning: remounting fs with errors, " + "running fsck is recommended\n"); + } + return 0; +} + +static bool minix_check_superblock(struct super_block *sb) +{ + struct minix_sb_info *sbi = minix_sb(sb); + + if (sbi->s_imap_blocks == 0 || sbi->s_zmap_blocks == 0) + return false; + + /* + * s_max_size must not exceed the block mapping limitation. This check + * is only needed for V1 filesystems, since V2/V3 support an extra level + * of indirect blocks which places the limit well above U32_MAX. + */ + if (sbi->s_version == MINIX_V1 && + sb->s_maxbytes > (7 + 512 + 512*512) * BLOCK_SIZE) + return false; + + return true; +} + +static int minix_fill_super(struct super_block *s, void *data, int silent) +{ + struct buffer_head *bh; + struct buffer_head **map; + struct minix_super_block *ms; + struct minix3_super_block *m3s = NULL; + unsigned long i, block; + struct inode *root_inode; + struct minix_sb_info *sbi; + int ret = -EINVAL; + + sbi = kzalloc(sizeof(struct minix_sb_info), GFP_KERNEL); + if (!sbi) + return -ENOMEM; + s->s_fs_info = sbi; + + BUILD_BUG_ON(32 != sizeof (struct minix_inode)); + BUILD_BUG_ON(64 != sizeof(struct minix2_inode)); + + if (!sb_set_blocksize(s, BLOCK_SIZE)) + goto out_bad_hblock; + + if (!(bh = sb_bread(s, 1))) + goto out_bad_sb; + + ms = (struct minix_super_block *) bh->b_data; + sbi->s_ms = ms; + sbi->s_sbh = bh; + sbi->s_mount_state = ms->s_state; + sbi->s_ninodes = ms->s_ninodes; + sbi->s_nzones = ms->s_nzones; + sbi->s_imap_blocks = ms->s_imap_blocks; + sbi->s_zmap_blocks = ms->s_zmap_blocks; + sbi->s_firstdatazone = ms->s_firstdatazone; + sbi->s_log_zone_size = ms->s_log_zone_size; + s->s_maxbytes = ms->s_max_size; + s->s_magic = ms->s_magic; + if (s->s_magic == MINIX_SUPER_MAGIC) { + sbi->s_version = MINIX_V1; + sbi->s_dirsize = 16; + sbi->s_namelen = 14; + s->s_max_links = MINIX_LINK_MAX; + } else if (s->s_magic == MINIX_SUPER_MAGIC2) { + sbi->s_version = MINIX_V1; + sbi->s_dirsize = 32; + sbi->s_namelen = 30; + s->s_max_links = MINIX_LINK_MAX; + } else if (s->s_magic == MINIX2_SUPER_MAGIC) { + sbi->s_version = MINIX_V2; + sbi->s_nzones = ms->s_zones; + sbi->s_dirsize = 16; + sbi->s_namelen = 14; + s->s_max_links = MINIX2_LINK_MAX; + } else if (s->s_magic == MINIX2_SUPER_MAGIC2) { + sbi->s_version = MINIX_V2; + sbi->s_nzones = ms->s_zones; + sbi->s_dirsize = 32; + sbi->s_namelen = 30; + s->s_max_links = MINIX2_LINK_MAX; + } else if ( *(__u16 *)(bh->b_data + 24) == MINIX3_SUPER_MAGIC) { + m3s = (struct minix3_super_block *) bh->b_data; + s->s_magic = m3s->s_magic; + sbi->s_imap_blocks = m3s->s_imap_blocks; + sbi->s_zmap_blocks = m3s->s_zmap_blocks; + sbi->s_firstdatazone = m3s->s_firstdatazone; + sbi->s_log_zone_size = m3s->s_log_zone_size; + s->s_maxbytes = m3s->s_max_size; + sbi->s_ninodes = m3s->s_ninodes; + sbi->s_nzones = m3s->s_zones; + sbi->s_dirsize = 64; + sbi->s_namelen = 60; + sbi->s_version = MINIX_V3; + sbi->s_mount_state = MINIX_VALID_FS; + sb_set_blocksize(s, m3s->s_blocksize); + s->s_max_links = MINIX2_LINK_MAX; + } else + goto out_no_fs; + + if (!minix_check_superblock(s)) + goto out_illegal_sb; + + /* + * Allocate the buffer map to keep the superblock small. + */ + i = (sbi->s_imap_blocks + sbi->s_zmap_blocks) * sizeof(bh); + map = kzalloc(i, GFP_KERNEL); + if (!map) + goto out_no_map; + sbi->s_imap = &map[0]; + sbi->s_zmap = &map[sbi->s_imap_blocks]; + + block=2; + for (i=0 ; i < sbi->s_imap_blocks ; i++) { + if (!(sbi->s_imap[i]=sb_bread(s, block))) + goto out_no_bitmap; + block++; + } + for (i=0 ; i < sbi->s_zmap_blocks ; i++) { + if (!(sbi->s_zmap[i]=sb_bread(s, block))) + goto out_no_bitmap; + block++; + } + + minix_set_bit(0,sbi->s_imap[0]->b_data); + minix_set_bit(0,sbi->s_zmap[0]->b_data); + + /* Apparently minix can create filesystems that allocate more blocks for + * the bitmaps than needed. We simply ignore that, but verify it didn't + * create one with not enough blocks and bail out if so. + */ + block = minix_blocks_needed(sbi->s_ninodes, s->s_blocksize); + if (sbi->s_imap_blocks < block) { + printk("MINIX-fs: file system does not have enough " + "imap blocks allocated. Refusing to mount.\n"); + goto out_no_bitmap; + } + + block = minix_blocks_needed( + (sbi->s_nzones - sbi->s_firstdatazone + 1), + s->s_blocksize); + if (sbi->s_zmap_blocks < block) { + printk("MINIX-fs: file system does not have enough " + "zmap blocks allocated. Refusing to mount.\n"); + goto out_no_bitmap; + } + + /* set up enough so that it can read an inode */ + s->s_op = &minix_sops; + s->s_time_min = 0; + s->s_time_max = U32_MAX; + root_inode = minix_iget(s, MINIX_ROOT_INO); + if (IS_ERR(root_inode)) { + ret = PTR_ERR(root_inode); + goto out_no_root; + } + + ret = -ENOMEM; + s->s_root = d_make_root(root_inode); + if (!s->s_root) + goto out_no_root; + + if (!sb_rdonly(s)) { + if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */ + ms->s_state &= ~MINIX_VALID_FS; + mark_buffer_dirty(bh); + } + if (!(sbi->s_mount_state & MINIX_VALID_FS)) + printk("MINIX-fs: mounting unchecked file system, " + "running fsck is recommended\n"); + else if (sbi->s_mount_state & MINIX_ERROR_FS) + printk("MINIX-fs: mounting file system with errors, " + "running fsck is recommended\n"); + + return 0; + +out_no_root: + if (!silent) + printk("MINIX-fs: get root inode failed\n"); + goto out_freemap; + +out_no_bitmap: + printk("MINIX-fs: bad superblock or unable to read bitmaps\n"); +out_freemap: + for (i = 0; i < sbi->s_imap_blocks; i++) + brelse(sbi->s_imap[i]); + for (i = 0; i < sbi->s_zmap_blocks; i++) + brelse(sbi->s_zmap[i]); + kfree(sbi->s_imap); + goto out_release; + +out_no_map: + ret = -ENOMEM; + if (!silent) + printk("MINIX-fs: can't allocate map\n"); + goto out_release; + +out_illegal_sb: + if (!silent) + printk("MINIX-fs: bad superblock\n"); + goto out_release; + +out_no_fs: + if (!silent) + printk("VFS: Can't find a Minix filesystem V1 | V2 | V3 " + "on device %s.\n", s->s_id); +out_release: + brelse(bh); + goto out; + +out_bad_hblock: + printk("MINIX-fs: blocksize too small for device\n"); + goto out; + +out_bad_sb: + printk("MINIX-fs: unable to read superblock\n"); +out: + s->s_fs_info = NULL; + kfree(sbi); + return ret; +} + +static int minix_statfs(struct dentry *dentry, struct kstatfs *buf) +{ + struct super_block *sb = dentry->d_sb; + struct minix_sb_info *sbi = minix_sb(sb); + u64 id = huge_encode_dev(sb->s_bdev->bd_dev); + buf->f_type = sb->s_magic; + buf->f_bsize = sb->s_blocksize; + buf->f_blocks = (sbi->s_nzones - sbi->s_firstdatazone) << sbi->s_log_zone_size; + buf->f_bfree = minix_count_free_blocks(sb); + buf->f_bavail = buf->f_bfree; + buf->f_files = sbi->s_ninodes; + buf->f_ffree = minix_count_free_inodes(sb); + buf->f_namelen = sbi->s_namelen; + buf->f_fsid = u64_to_fsid(id); + + return 0; +} + +static int minix_get_block(struct inode *inode, sector_t block, + struct buffer_head *bh_result, int create) +{ + if (INODE_VERSION(inode) == MINIX_V1) + return V1_minix_get_block(inode, block, bh_result, create); + else + return V2_minix_get_block(inode, block, bh_result, create); +} + +static int minix_writepage(struct page *page, struct writeback_control *wbc) +{ + return block_write_full_page(page, minix_get_block, wbc); +} + +static int minix_read_folio(struct file *file, struct folio *folio) +{ + return block_read_full_folio(folio, minix_get_block); +} + +int minix_prepare_chunk(struct page *page, loff_t pos, unsigned len) +{ + return __block_write_begin(page, pos, len, minix_get_block); +} + +static void minix_write_failed(struct address_space *mapping, loff_t to) +{ + struct inode *inode = mapping->host; + + if (to > inode->i_size) { + truncate_pagecache(inode, inode->i_size); + minix_truncate(inode); + } +} + +static int minix_write_begin(struct file *file, struct address_space *mapping, + loff_t pos, unsigned len, + struct page **pagep, void **fsdata) +{ + int ret; + + ret = block_write_begin(mapping, pos, len, pagep, minix_get_block); + if (unlikely(ret)) + minix_write_failed(mapping, pos + len); + + return ret; +} + +static sector_t minix_bmap(struct address_space *mapping, sector_t block) +{ + return generic_block_bmap(mapping,block,minix_get_block); +} + +static const struct address_space_operations minix_aops = { + .dirty_folio = block_dirty_folio, + .invalidate_folio = block_invalidate_folio, + .read_folio = minix_read_folio, + .writepage = minix_writepage, + .write_begin = minix_write_begin, + .write_end = generic_write_end, + .bmap = minix_bmap, + .direct_IO = noop_direct_IO +}; + +static const struct inode_operations minix_symlink_inode_operations = { + .get_link = page_get_link, + .getattr = minix_getattr, +}; + +void minix_set_inode(struct inode *inode, dev_t rdev) +{ + if (S_ISREG(inode->i_mode)) { + inode->i_op = &minix_file_inode_operations; + inode->i_fop = &minix_file_operations; + inode->i_mapping->a_ops = &minix_aops; + } else if (S_ISDIR(inode->i_mode)) { + inode->i_op = &minix_dir_inode_operations; + inode->i_fop = &minix_dir_operations; + inode->i_mapping->a_ops = &minix_aops; + } else if (S_ISLNK(inode->i_mode)) { + inode->i_op = &minix_symlink_inode_operations; + inode_nohighmem(inode); + inode->i_mapping->a_ops = &minix_aops; + } else + init_special_inode(inode, inode->i_mode, rdev); +} + +/* + * The minix V1 function to read an inode. + */ +static struct inode *V1_minix_iget(struct inode *inode) +{ + struct buffer_head * bh; + struct minix_inode * raw_inode; + struct minix_inode_info *minix_inode = minix_i(inode); + int i; + + raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh); + if (!raw_inode) { + iget_failed(inode); + return ERR_PTR(-EIO); + } + if (raw_inode->i_nlinks == 0) { + printk("MINIX-fs: deleted inode referenced: %lu\n", + inode->i_ino); + brelse(bh); + iget_failed(inode); + return ERR_PTR(-ESTALE); + } + inode->i_mode = raw_inode->i_mode; + i_uid_write(inode, raw_inode->i_uid); + i_gid_write(inode, raw_inode->i_gid); + set_nlink(inode, raw_inode->i_nlinks); + inode->i_size = raw_inode->i_size; + inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = raw_inode->i_time; + inode->i_mtime.tv_nsec = 0; + inode->i_atime.tv_nsec = 0; + inode->i_ctime.tv_nsec = 0; + inode->i_blocks = 0; + for (i = 0; i < 9; i++) + minix_inode->u.i1_data[i] = raw_inode->i_zone[i]; + minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0])); + brelse(bh); + unlock_new_inode(inode); + return inode; +} + +/* + * The minix V2 function to read an inode. + */ +static struct inode *V2_minix_iget(struct inode *inode) +{ + struct buffer_head * bh; + struct minix2_inode * raw_inode; + struct minix_inode_info *minix_inode = minix_i(inode); + int i; + + raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh); + if (!raw_inode) { + iget_failed(inode); + return ERR_PTR(-EIO); + } + if (raw_inode->i_nlinks == 0) { + printk("MINIX-fs: deleted inode referenced: %lu\n", + inode->i_ino); + brelse(bh); + iget_failed(inode); + return ERR_PTR(-ESTALE); + } + inode->i_mode = raw_inode->i_mode; + i_uid_write(inode, raw_inode->i_uid); + i_gid_write(inode, raw_inode->i_gid); + set_nlink(inode, raw_inode->i_nlinks); + inode->i_size = raw_inode->i_size; + inode->i_mtime.tv_sec = raw_inode->i_mtime; + inode->i_atime.tv_sec = raw_inode->i_atime; + inode->i_ctime.tv_sec = raw_inode->i_ctime; + inode->i_mtime.tv_nsec = 0; + inode->i_atime.tv_nsec = 0; + inode->i_ctime.tv_nsec = 0; + inode->i_blocks = 0; + for (i = 0; i < 10; i++) + minix_inode->u.i2_data[i] = raw_inode->i_zone[i]; + minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0])); + brelse(bh); + unlock_new_inode(inode); + return inode; +} + +/* + * The global function to read an inode. + */ +struct inode *minix_iget(struct super_block *sb, unsigned long ino) +{ + struct inode *inode; + + inode = iget_locked(sb, ino); + if (!inode) + return ERR_PTR(-ENOMEM); + if (!(inode->i_state & I_NEW)) + return inode; + + if (INODE_VERSION(inode) == MINIX_V1) + return V1_minix_iget(inode); + else + return V2_minix_iget(inode); +} + +/* + * The minix V1 function to synchronize an inode. + */ +static struct buffer_head * V1_minix_update_inode(struct inode * inode) +{ + struct buffer_head * bh; + struct minix_inode * raw_inode; + struct minix_inode_info *minix_inode = minix_i(inode); + int i; + + raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh); + if (!raw_inode) + return NULL; + raw_inode->i_mode = inode->i_mode; + raw_inode->i_uid = fs_high2lowuid(i_uid_read(inode)); + raw_inode->i_gid = fs_high2lowgid(i_gid_read(inode)); + raw_inode->i_nlinks = inode->i_nlink; + raw_inode->i_size = inode->i_size; + raw_inode->i_time = inode->i_mtime.tv_sec; + if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) + raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev); + else for (i = 0; i < 9; i++) + raw_inode->i_zone[i] = minix_inode->u.i1_data[i]; + mark_buffer_dirty(bh); + return bh; +} + +/* + * The minix V2 function to synchronize an inode. + */ +static struct buffer_head * V2_minix_update_inode(struct inode * inode) +{ + struct buffer_head * bh; + struct minix2_inode * raw_inode; + struct minix_inode_info *minix_inode = minix_i(inode); + int i; + + raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh); + if (!raw_inode) + return NULL; + raw_inode->i_mode = inode->i_mode; + raw_inode->i_uid = fs_high2lowuid(i_uid_read(inode)); + raw_inode->i_gid = fs_high2lowgid(i_gid_read(inode)); + raw_inode->i_nlinks = inode->i_nlink; + raw_inode->i_size = inode->i_size; + raw_inode->i_mtime = inode->i_mtime.tv_sec; + raw_inode->i_atime = inode->i_atime.tv_sec; + raw_inode->i_ctime = inode->i_ctime.tv_sec; + if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) + raw_inode->i_zone[0] = old_encode_dev(inode->i_rdev); + else for (i = 0; i < 10; i++) + raw_inode->i_zone[i] = minix_inode->u.i2_data[i]; + mark_buffer_dirty(bh); + return bh; +} + +static int minix_write_inode(struct inode *inode, struct writeback_control *wbc) +{ + int err = 0; + struct buffer_head *bh; + + if (INODE_VERSION(inode) == MINIX_V1) + bh = V1_minix_update_inode(inode); + else + bh = V2_minix_update_inode(inode); + if (!bh) + return -EIO; + if (wbc->sync_mode == WB_SYNC_ALL && buffer_dirty(bh)) { + sync_dirty_buffer(bh); + if (buffer_req(bh) && !buffer_uptodate(bh)) { + printk("IO error syncing minix inode [%s:%08lx]\n", + inode->i_sb->s_id, inode->i_ino); + err = -EIO; + } + } + brelse (bh); + return err; +} + +int minix_getattr(struct mnt_idmap *idmap, const struct path *path, + struct kstat *stat, u32 request_mask, unsigned int flags) +{ + struct super_block *sb = path->dentry->d_sb; + struct inode *inode = d_inode(path->dentry); + + generic_fillattr(&nop_mnt_idmap, inode, stat); + if (INODE_VERSION(inode) == MINIX_V1) + stat->blocks = (BLOCK_SIZE / 512) * V1_minix_blocks(stat->size, sb); + else + stat->blocks = (sb->s_blocksize / 512) * V2_minix_blocks(stat->size, sb); + stat->blksize = sb->s_blocksize; + return 0; +} + +/* + * The function that is called for file truncation. + */ +void minix_truncate(struct inode * inode) +{ + if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode))) + return; + if (INODE_VERSION(inode) == MINIX_V1) + V1_minix_truncate(inode); + else + V2_minix_truncate(inode); +} + +static struct dentry *minix_mount(struct file_system_type *fs_type, + int flags, const char *dev_name, void *data) +{ + return mount_bdev(fs_type, flags, dev_name, data, minix_fill_super); +} + +static struct file_system_type minix_fs_type = { + .owner = THIS_MODULE, + .name = "minix", + .mount = minix_mount, + .kill_sb = kill_block_super, + .fs_flags = FS_REQUIRES_DEV, +}; +MODULE_ALIAS_FS("minix"); + +static int __init init_minix_fs(void) +{ + int err = init_inodecache(); + if (err) + goto out1; + err = register_filesystem(&minix_fs_type); + if (err) + goto out; + return 0; +out: + destroy_inodecache(); +out1: + return err; +} + +static void __exit exit_minix_fs(void) +{ + unregister_filesystem(&minix_fs_type); + destroy_inodecache(); +} + +module_init(init_minix_fs) +module_exit(exit_minix_fs) +MODULE_LICENSE("GPL"); + -- cgit v1.2.3