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/erofs/xattr.c | 654 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 654 insertions(+) create mode 100644 fs/erofs/xattr.c (limited to 'fs/erofs/xattr.c') diff --git a/fs/erofs/xattr.c b/fs/erofs/xattr.c new file mode 100644 index 000000000..60729b122 --- /dev/null +++ b/fs/erofs/xattr.c @@ -0,0 +1,654 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2017-2018 HUAWEI, Inc. + * https://www.huawei.com/ + * Copyright (C) 2021-2022, Alibaba Cloud + */ +#include +#include "xattr.h" + +struct xattr_iter { + struct super_block *sb; + struct erofs_buf buf; + void *kaddr; + + erofs_blk_t blkaddr; + unsigned int ofs; +}; + +static int init_inode_xattrs(struct inode *inode) +{ + struct erofs_inode *const vi = EROFS_I(inode); + struct xattr_iter it; + unsigned int i; + struct erofs_xattr_ibody_header *ih; + struct super_block *sb = inode->i_sb; + int ret = 0; + + /* the most case is that xattrs of this inode are initialized. */ + if (test_bit(EROFS_I_EA_INITED_BIT, &vi->flags)) { + /* + * paired with smp_mb() at the end of the function to ensure + * fields will only be observed after the bit is set. + */ + smp_mb(); + return 0; + } + + if (wait_on_bit_lock(&vi->flags, EROFS_I_BL_XATTR_BIT, TASK_KILLABLE)) + return -ERESTARTSYS; + + /* someone has initialized xattrs for us? */ + if (test_bit(EROFS_I_EA_INITED_BIT, &vi->flags)) + goto out_unlock; + + /* + * bypass all xattr operations if ->xattr_isize is not greater than + * sizeof(struct erofs_xattr_ibody_header), in detail: + * 1) it is not enough to contain erofs_xattr_ibody_header then + * ->xattr_isize should be 0 (it means no xattr); + * 2) it is just to contain erofs_xattr_ibody_header, which is on-disk + * undefined right now (maybe use later with some new sb feature). + */ + if (vi->xattr_isize == sizeof(struct erofs_xattr_ibody_header)) { + erofs_err(sb, + "xattr_isize %d of nid %llu is not supported yet", + vi->xattr_isize, vi->nid); + ret = -EOPNOTSUPP; + goto out_unlock; + } else if (vi->xattr_isize < sizeof(struct erofs_xattr_ibody_header)) { + if (vi->xattr_isize) { + erofs_err(sb, "bogus xattr ibody @ nid %llu", vi->nid); + DBG_BUGON(1); + ret = -EFSCORRUPTED; + goto out_unlock; /* xattr ondisk layout error */ + } + ret = -ENOATTR; + goto out_unlock; + } + + it.buf = __EROFS_BUF_INITIALIZER; + it.blkaddr = erofs_blknr(erofs_iloc(inode) + vi->inode_isize); + it.ofs = erofs_blkoff(erofs_iloc(inode) + vi->inode_isize); + + /* read in shared xattr array (non-atomic, see kmalloc below) */ + it.kaddr = erofs_read_metabuf(&it.buf, sb, it.blkaddr, EROFS_KMAP); + if (IS_ERR(it.kaddr)) { + ret = PTR_ERR(it.kaddr); + goto out_unlock; + } + + ih = (struct erofs_xattr_ibody_header *)(it.kaddr + it.ofs); + vi->xattr_shared_count = ih->h_shared_count; + vi->xattr_shared_xattrs = kmalloc_array(vi->xattr_shared_count, + sizeof(uint), GFP_KERNEL); + if (!vi->xattr_shared_xattrs) { + erofs_put_metabuf(&it.buf); + ret = -ENOMEM; + goto out_unlock; + } + + /* let's skip ibody header */ + it.ofs += sizeof(struct erofs_xattr_ibody_header); + + for (i = 0; i < vi->xattr_shared_count; ++i) { + if (it.ofs >= EROFS_BLKSIZ) { + /* cannot be unaligned */ + DBG_BUGON(it.ofs != EROFS_BLKSIZ); + + it.kaddr = erofs_read_metabuf(&it.buf, sb, ++it.blkaddr, + EROFS_KMAP); + if (IS_ERR(it.kaddr)) { + kfree(vi->xattr_shared_xattrs); + vi->xattr_shared_xattrs = NULL; + ret = PTR_ERR(it.kaddr); + goto out_unlock; + } + it.ofs = 0; + } + vi->xattr_shared_xattrs[i] = + le32_to_cpu(*(__le32 *)(it.kaddr + it.ofs)); + it.ofs += sizeof(__le32); + } + erofs_put_metabuf(&it.buf); + + /* paired with smp_mb() at the beginning of the function. */ + smp_mb(); + set_bit(EROFS_I_EA_INITED_BIT, &vi->flags); + +out_unlock: + clear_and_wake_up_bit(EROFS_I_BL_XATTR_BIT, &vi->flags); + return ret; +} + +/* + * the general idea for these return values is + * if 0 is returned, go on processing the current xattr; + * 1 (> 0) is returned, skip this round to process the next xattr; + * -err (< 0) is returned, an error (maybe ENOXATTR) occurred + * and need to be handled + */ +struct xattr_iter_handlers { + int (*entry)(struct xattr_iter *_it, struct erofs_xattr_entry *entry); + int (*name)(struct xattr_iter *_it, unsigned int processed, char *buf, + unsigned int len); + int (*alloc_buffer)(struct xattr_iter *_it, unsigned int value_sz); + void (*value)(struct xattr_iter *_it, unsigned int processed, char *buf, + unsigned int len); +}; + +static inline int xattr_iter_fixup(struct xattr_iter *it) +{ + if (it->ofs < EROFS_BLKSIZ) + return 0; + + it->blkaddr += erofs_blknr(it->ofs); + it->kaddr = erofs_read_metabuf(&it->buf, it->sb, it->blkaddr, + EROFS_KMAP); + if (IS_ERR(it->kaddr)) + return PTR_ERR(it->kaddr); + it->ofs = erofs_blkoff(it->ofs); + return 0; +} + +static int inline_xattr_iter_begin(struct xattr_iter *it, + struct inode *inode) +{ + struct erofs_inode *const vi = EROFS_I(inode); + unsigned int xattr_header_sz, inline_xattr_ofs; + + xattr_header_sz = inlinexattr_header_size(inode); + if (xattr_header_sz >= vi->xattr_isize) { + DBG_BUGON(xattr_header_sz > vi->xattr_isize); + return -ENOATTR; + } + + inline_xattr_ofs = vi->inode_isize + xattr_header_sz; + + it->blkaddr = erofs_blknr(erofs_iloc(inode) + inline_xattr_ofs); + it->ofs = erofs_blkoff(erofs_iloc(inode) + inline_xattr_ofs); + it->kaddr = erofs_read_metabuf(&it->buf, inode->i_sb, it->blkaddr, + EROFS_KMAP); + if (IS_ERR(it->kaddr)) + return PTR_ERR(it->kaddr); + return vi->xattr_isize - xattr_header_sz; +} + +/* + * Regardless of success or failure, `xattr_foreach' will end up with + * `ofs' pointing to the next xattr item rather than an arbitrary position. + */ +static int xattr_foreach(struct xattr_iter *it, + const struct xattr_iter_handlers *op, + unsigned int *tlimit) +{ + struct erofs_xattr_entry entry; + unsigned int value_sz, processed, slice; + int err; + + /* 0. fixup blkaddr, ofs, ipage */ + err = xattr_iter_fixup(it); + if (err) + return err; + + /* + * 1. read xattr entry to the memory, + * since we do EROFS_XATTR_ALIGN + * therefore entry should be in the page + */ + entry = *(struct erofs_xattr_entry *)(it->kaddr + it->ofs); + if (tlimit) { + unsigned int entry_sz = erofs_xattr_entry_size(&entry); + + /* xattr on-disk corruption: xattr entry beyond xattr_isize */ + if (*tlimit < entry_sz) { + DBG_BUGON(1); + return -EFSCORRUPTED; + } + *tlimit -= entry_sz; + } + + it->ofs += sizeof(struct erofs_xattr_entry); + value_sz = le16_to_cpu(entry.e_value_size); + + /* handle entry */ + err = op->entry(it, &entry); + if (err) { + it->ofs += entry.e_name_len + value_sz; + goto out; + } + + /* 2. handle xattr name (ofs will finally be at the end of name) */ + processed = 0; + + while (processed < entry.e_name_len) { + if (it->ofs >= EROFS_BLKSIZ) { + DBG_BUGON(it->ofs > EROFS_BLKSIZ); + + err = xattr_iter_fixup(it); + if (err) + goto out; + it->ofs = 0; + } + + slice = min_t(unsigned int, EROFS_BLKSIZ - it->ofs, + entry.e_name_len - processed); + + /* handle name */ + err = op->name(it, processed, it->kaddr + it->ofs, slice); + if (err) { + it->ofs += entry.e_name_len - processed + value_sz; + goto out; + } + + it->ofs += slice; + processed += slice; + } + + /* 3. handle xattr value */ + processed = 0; + + if (op->alloc_buffer) { + err = op->alloc_buffer(it, value_sz); + if (err) { + it->ofs += value_sz; + goto out; + } + } + + while (processed < value_sz) { + if (it->ofs >= EROFS_BLKSIZ) { + DBG_BUGON(it->ofs > EROFS_BLKSIZ); + + err = xattr_iter_fixup(it); + if (err) + goto out; + it->ofs = 0; + } + + slice = min_t(unsigned int, EROFS_BLKSIZ - it->ofs, + value_sz - processed); + op->value(it, processed, it->kaddr + it->ofs, slice); + it->ofs += slice; + processed += slice; + } + +out: + /* xattrs should be 4-byte aligned (on-disk constraint) */ + it->ofs = EROFS_XATTR_ALIGN(it->ofs); + return err < 0 ? err : 0; +} + +struct getxattr_iter { + struct xattr_iter it; + + char *buffer; + int buffer_size, index; + struct qstr name; +}; + +static int xattr_entrymatch(struct xattr_iter *_it, + struct erofs_xattr_entry *entry) +{ + struct getxattr_iter *it = container_of(_it, struct getxattr_iter, it); + + return (it->index != entry->e_name_index || + it->name.len != entry->e_name_len) ? -ENOATTR : 0; +} + +static int xattr_namematch(struct xattr_iter *_it, + unsigned int processed, char *buf, unsigned int len) +{ + struct getxattr_iter *it = container_of(_it, struct getxattr_iter, it); + + return memcmp(buf, it->name.name + processed, len) ? -ENOATTR : 0; +} + +static int xattr_checkbuffer(struct xattr_iter *_it, + unsigned int value_sz) +{ + struct getxattr_iter *it = container_of(_it, struct getxattr_iter, it); + int err = it->buffer_size < value_sz ? -ERANGE : 0; + + it->buffer_size = value_sz; + return !it->buffer ? 1 : err; +} + +static void xattr_copyvalue(struct xattr_iter *_it, + unsigned int processed, + char *buf, unsigned int len) +{ + struct getxattr_iter *it = container_of(_it, struct getxattr_iter, it); + + memcpy(it->buffer + processed, buf, len); +} + +static const struct xattr_iter_handlers find_xattr_handlers = { + .entry = xattr_entrymatch, + .name = xattr_namematch, + .alloc_buffer = xattr_checkbuffer, + .value = xattr_copyvalue +}; + +static int inline_getxattr(struct inode *inode, struct getxattr_iter *it) +{ + int ret; + unsigned int remaining; + + ret = inline_xattr_iter_begin(&it->it, inode); + if (ret < 0) + return ret; + + remaining = ret; + while (remaining) { + ret = xattr_foreach(&it->it, &find_xattr_handlers, &remaining); + if (ret != -ENOATTR) + break; + } + return ret ? ret : it->buffer_size; +} + +static int shared_getxattr(struct inode *inode, struct getxattr_iter *it) +{ + struct erofs_inode *const vi = EROFS_I(inode); + struct super_block *const sb = inode->i_sb; + struct erofs_sb_info *const sbi = EROFS_SB(sb); + unsigned int i; + int ret = -ENOATTR; + + for (i = 0; i < vi->xattr_shared_count; ++i) { + erofs_blk_t blkaddr = + xattrblock_addr(sbi, vi->xattr_shared_xattrs[i]); + + it->it.ofs = xattrblock_offset(sbi, vi->xattr_shared_xattrs[i]); + it->it.kaddr = erofs_read_metabuf(&it->it.buf, sb, blkaddr, + EROFS_KMAP); + if (IS_ERR(it->it.kaddr)) + return PTR_ERR(it->it.kaddr); + it->it.blkaddr = blkaddr; + + ret = xattr_foreach(&it->it, &find_xattr_handlers, NULL); + if (ret != -ENOATTR) + break; + } + return ret ? ret : it->buffer_size; +} + +static bool erofs_xattr_user_list(struct dentry *dentry) +{ + return test_opt(&EROFS_SB(dentry->d_sb)->opt, XATTR_USER); +} + +static bool erofs_xattr_trusted_list(struct dentry *dentry) +{ + return capable(CAP_SYS_ADMIN); +} + +int erofs_getxattr(struct inode *inode, int index, + const char *name, + void *buffer, size_t buffer_size) +{ + int ret; + struct getxattr_iter it; + + if (!name) + return -EINVAL; + + ret = init_inode_xattrs(inode); + if (ret) + return ret; + + it.index = index; + it.name.len = strlen(name); + if (it.name.len > EROFS_NAME_LEN) + return -ERANGE; + + it.it.buf = __EROFS_BUF_INITIALIZER; + it.name.name = name; + + it.buffer = buffer; + it.buffer_size = buffer_size; + + it.it.sb = inode->i_sb; + ret = inline_getxattr(inode, &it); + if (ret == -ENOATTR) + ret = shared_getxattr(inode, &it); + erofs_put_metabuf(&it.it.buf); + return ret; +} + +static int erofs_xattr_generic_get(const struct xattr_handler *handler, + struct dentry *unused, struct inode *inode, + const char *name, void *buffer, size_t size) +{ + struct erofs_sb_info *const sbi = EROFS_I_SB(inode); + + switch (handler->flags) { + case EROFS_XATTR_INDEX_USER: + if (!test_opt(&sbi->opt, XATTR_USER)) + return -EOPNOTSUPP; + break; + case EROFS_XATTR_INDEX_TRUSTED: + break; + case EROFS_XATTR_INDEX_SECURITY: + break; + default: + return -EINVAL; + } + + return erofs_getxattr(inode, handler->flags, name, buffer, size); +} + +const struct xattr_handler erofs_xattr_user_handler = { + .prefix = XATTR_USER_PREFIX, + .flags = EROFS_XATTR_INDEX_USER, + .list = erofs_xattr_user_list, + .get = erofs_xattr_generic_get, +}; + +const struct xattr_handler erofs_xattr_trusted_handler = { + .prefix = XATTR_TRUSTED_PREFIX, + .flags = EROFS_XATTR_INDEX_TRUSTED, + .list = erofs_xattr_trusted_list, + .get = erofs_xattr_generic_get, +}; + +#ifdef CONFIG_EROFS_FS_SECURITY +const struct xattr_handler __maybe_unused erofs_xattr_security_handler = { + .prefix = XATTR_SECURITY_PREFIX, + .flags = EROFS_XATTR_INDEX_SECURITY, + .get = erofs_xattr_generic_get, +}; +#endif + +const struct xattr_handler *erofs_xattr_handlers[] = { + &erofs_xattr_user_handler, +#ifdef CONFIG_EROFS_FS_POSIX_ACL + &posix_acl_access_xattr_handler, + &posix_acl_default_xattr_handler, +#endif + &erofs_xattr_trusted_handler, +#ifdef CONFIG_EROFS_FS_SECURITY + &erofs_xattr_security_handler, +#endif + NULL, +}; + +struct listxattr_iter { + struct xattr_iter it; + + struct dentry *dentry; + char *buffer; + int buffer_size, buffer_ofs; +}; + +static int xattr_entrylist(struct xattr_iter *_it, + struct erofs_xattr_entry *entry) +{ + struct listxattr_iter *it = + container_of(_it, struct listxattr_iter, it); + unsigned int prefix_len; + const char *prefix; + + const struct xattr_handler *h = + erofs_xattr_handler(entry->e_name_index); + + if (!h || (h->list && !h->list(it->dentry))) + return 1; + + prefix = xattr_prefix(h); + prefix_len = strlen(prefix); + + if (!it->buffer) { + it->buffer_ofs += prefix_len + entry->e_name_len + 1; + return 1; + } + + if (it->buffer_ofs + prefix_len + + entry->e_name_len + 1 > it->buffer_size) + return -ERANGE; + + memcpy(it->buffer + it->buffer_ofs, prefix, prefix_len); + it->buffer_ofs += prefix_len; + return 0; +} + +static int xattr_namelist(struct xattr_iter *_it, + unsigned int processed, char *buf, unsigned int len) +{ + struct listxattr_iter *it = + container_of(_it, struct listxattr_iter, it); + + memcpy(it->buffer + it->buffer_ofs, buf, len); + it->buffer_ofs += len; + return 0; +} + +static int xattr_skipvalue(struct xattr_iter *_it, + unsigned int value_sz) +{ + struct listxattr_iter *it = + container_of(_it, struct listxattr_iter, it); + + it->buffer[it->buffer_ofs++] = '\0'; + return 1; +} + +static const struct xattr_iter_handlers list_xattr_handlers = { + .entry = xattr_entrylist, + .name = xattr_namelist, + .alloc_buffer = xattr_skipvalue, + .value = NULL +}; + +static int inline_listxattr(struct listxattr_iter *it) +{ + int ret; + unsigned int remaining; + + ret = inline_xattr_iter_begin(&it->it, d_inode(it->dentry)); + if (ret < 0) + return ret; + + remaining = ret; + while (remaining) { + ret = xattr_foreach(&it->it, &list_xattr_handlers, &remaining); + if (ret) + break; + } + return ret ? ret : it->buffer_ofs; +} + +static int shared_listxattr(struct listxattr_iter *it) +{ + struct inode *const inode = d_inode(it->dentry); + struct erofs_inode *const vi = EROFS_I(inode); + struct super_block *const sb = inode->i_sb; + struct erofs_sb_info *const sbi = EROFS_SB(sb); + unsigned int i; + int ret = 0; + + for (i = 0; i < vi->xattr_shared_count; ++i) { + erofs_blk_t blkaddr = + xattrblock_addr(sbi, vi->xattr_shared_xattrs[i]); + + it->it.ofs = xattrblock_offset(sbi, vi->xattr_shared_xattrs[i]); + it->it.kaddr = erofs_read_metabuf(&it->it.buf, sb, blkaddr, + EROFS_KMAP); + if (IS_ERR(it->it.kaddr)) + return PTR_ERR(it->it.kaddr); + it->it.blkaddr = blkaddr; + + ret = xattr_foreach(&it->it, &list_xattr_handlers, NULL); + if (ret) + break; + } + return ret ? ret : it->buffer_ofs; +} + +ssize_t erofs_listxattr(struct dentry *dentry, + char *buffer, size_t buffer_size) +{ + int ret; + struct listxattr_iter it; + + ret = init_inode_xattrs(d_inode(dentry)); + if (ret == -ENOATTR) + return 0; + if (ret) + return ret; + + it.it.buf = __EROFS_BUF_INITIALIZER; + it.dentry = dentry; + it.buffer = buffer; + it.buffer_size = buffer_size; + it.buffer_ofs = 0; + + it.it.sb = dentry->d_sb; + + ret = inline_listxattr(&it); + if (ret >= 0 || ret == -ENOATTR) + ret = shared_listxattr(&it); + erofs_put_metabuf(&it.it.buf); + return ret; +} + +#ifdef CONFIG_EROFS_FS_POSIX_ACL +struct posix_acl *erofs_get_acl(struct inode *inode, int type, bool rcu) +{ + struct posix_acl *acl; + int prefix, rc; + char *value = NULL; + + if (rcu) + return ERR_PTR(-ECHILD); + + switch (type) { + case ACL_TYPE_ACCESS: + prefix = EROFS_XATTR_INDEX_POSIX_ACL_ACCESS; + break; + case ACL_TYPE_DEFAULT: + prefix = EROFS_XATTR_INDEX_POSIX_ACL_DEFAULT; + break; + default: + return ERR_PTR(-EINVAL); + } + + rc = erofs_getxattr(inode, prefix, "", NULL, 0); + if (rc > 0) { + value = kmalloc(rc, GFP_KERNEL); + if (!value) + return ERR_PTR(-ENOMEM); + rc = erofs_getxattr(inode, prefix, "", value, rc); + } + + if (rc == -ENOATTR) + acl = NULL; + else if (rc < 0) + acl = ERR_PTR(rc); + else + acl = posix_acl_from_xattr(&init_user_ns, value, rc); + kfree(value); + return acl; +} +#endif -- cgit v1.2.3