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authorLibravatar Linus Torvalds <torvalds@linux-foundation.org>2023-02-21 18:24:12 -0800
committerLibravatar Linus Torvalds <torvalds@linux-foundation.org>2023-02-21 18:24:12 -0800
commit5b7c4cabbb65f5c469464da6c5f614cbd7f730f2 (patch)
treecc5c2d0a898769fd59549594fedb3ee6f84e59a0 /fs/minix/dir.c
downloadlinux-5b7c4cabbb65f5c469464da6c5f614cbd7f730f2.tar.gz
linux-5b7c4cabbb65f5c469464da6c5f614cbd7f730f2.zip
Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-nextgrafted
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(). ...
Diffstat (limited to 'fs/minix/dir.c')
-rw-r--r--fs/minix/dir.c469
1 files changed, 469 insertions, 0 deletions
diff --git a/fs/minix/dir.c b/fs/minix/dir.c
new file mode 100644
index 000000000..dcfe5b253
--- /dev/null
+++ b/fs/minix/dir.c
@@ -0,0 +1,469 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * linux/fs/minix/dir.c
+ *
+ * Copyright (C) 1991, 1992 Linus Torvalds
+ *
+ * minix directory handling functions
+ *
+ * Updated to filesystem version 3 by Daniel Aragones
+ */
+
+#include "minix.h"
+#include <linux/buffer_head.h>
+#include <linux/highmem.h>
+#include <linux/swap.h>
+
+typedef struct minix_dir_entry minix_dirent;
+typedef struct minix3_dir_entry minix3_dirent;
+
+static int minix_readdir(struct file *, struct dir_context *);
+
+const struct file_operations minix_dir_operations = {
+ .llseek = generic_file_llseek,
+ .read = generic_read_dir,
+ .iterate_shared = minix_readdir,
+ .fsync = generic_file_fsync,
+};
+
+static inline void dir_put_page(struct page *page)
+{
+ kunmap(page);
+ put_page(page);
+}
+
+/*
+ * Return the offset into page `page_nr' of the last valid
+ * byte in that page, plus one.
+ */
+static unsigned
+minix_last_byte(struct inode *inode, unsigned long page_nr)
+{
+ unsigned last_byte = PAGE_SIZE;
+
+ if (page_nr == (inode->i_size >> PAGE_SHIFT))
+ last_byte = inode->i_size & (PAGE_SIZE - 1);
+ return last_byte;
+}
+
+static int dir_commit_chunk(struct page *page, loff_t pos, unsigned len)
+{
+ struct address_space *mapping = page->mapping;
+ struct inode *dir = mapping->host;
+ int err = 0;
+ block_write_end(NULL, mapping, pos, len, len, page, NULL);
+
+ if (pos+len > dir->i_size) {
+ i_size_write(dir, pos+len);
+ mark_inode_dirty(dir);
+ }
+ if (IS_DIRSYNC(dir))
+ err = write_one_page(page);
+ else
+ unlock_page(page);
+ return err;
+}
+
+static struct page * dir_get_page(struct inode *dir, unsigned long n)
+{
+ struct address_space *mapping = dir->i_mapping;
+ struct page *page = read_mapping_page(mapping, n, NULL);
+ if (!IS_ERR(page))
+ kmap(page);
+ return page;
+}
+
+static inline void *minix_next_entry(void *de, struct minix_sb_info *sbi)
+{
+ return (void*)((char*)de + sbi->s_dirsize);
+}
+
+static int minix_readdir(struct file *file, struct dir_context *ctx)
+{
+ struct inode *inode = file_inode(file);
+ struct super_block *sb = inode->i_sb;
+ struct minix_sb_info *sbi = minix_sb(sb);
+ unsigned chunk_size = sbi->s_dirsize;
+ unsigned long npages = dir_pages(inode);
+ unsigned long pos = ctx->pos;
+ unsigned offset;
+ unsigned long n;
+
+ ctx->pos = pos = ALIGN(pos, chunk_size);
+ if (pos >= inode->i_size)
+ return 0;
+
+ offset = pos & ~PAGE_MASK;
+ n = pos >> PAGE_SHIFT;
+
+ for ( ; n < npages; n++, offset = 0) {
+ char *p, *kaddr, *limit;
+ struct page *page = dir_get_page(inode, n);
+
+ if (IS_ERR(page))
+ continue;
+ kaddr = (char *)page_address(page);
+ p = kaddr+offset;
+ limit = kaddr + minix_last_byte(inode, n) - chunk_size;
+ for ( ; p <= limit; p = minix_next_entry(p, sbi)) {
+ const char *name;
+ __u32 inumber;
+ if (sbi->s_version == MINIX_V3) {
+ minix3_dirent *de3 = (minix3_dirent *)p;
+ name = de3->name;
+ inumber = de3->inode;
+ } else {
+ minix_dirent *de = (minix_dirent *)p;
+ name = de->name;
+ inumber = de->inode;
+ }
+ if (inumber) {
+ unsigned l = strnlen(name, sbi->s_namelen);
+ if (!dir_emit(ctx, name, l,
+ inumber, DT_UNKNOWN)) {
+ dir_put_page(page);
+ return 0;
+ }
+ }
+ ctx->pos += chunk_size;
+ }
+ dir_put_page(page);
+ }
+ return 0;
+}
+
+static inline int namecompare(int len, int maxlen,
+ const char * name, const char * buffer)
+{
+ if (len < maxlen && buffer[len])
+ return 0;
+ return !memcmp(name, buffer, len);
+}
+
+/*
+ * minix_find_entry()
+ *
+ * finds an entry in the specified directory with the wanted name. It
+ * returns the cache buffer in which the entry was found, and the entry
+ * itself (as a parameter - res_dir). It does NOT read the inode of the
+ * entry - you'll have to do that yourself if you want to.
+ */
+minix_dirent *minix_find_entry(struct dentry *dentry, struct page **res_page)
+{
+ const char * name = dentry->d_name.name;
+ int namelen = dentry->d_name.len;
+ struct inode * dir = d_inode(dentry->d_parent);
+ struct super_block * sb = dir->i_sb;
+ struct minix_sb_info * sbi = minix_sb(sb);
+ unsigned long n;
+ unsigned long npages = dir_pages(dir);
+ struct page *page = NULL;
+ char *p;
+
+ char *namx;
+ __u32 inumber;
+ *res_page = NULL;
+
+ for (n = 0; n < npages; n++) {
+ char *kaddr, *limit;
+
+ page = dir_get_page(dir, n);
+ if (IS_ERR(page))
+ continue;
+
+ kaddr = (char*)page_address(page);
+ limit = kaddr + minix_last_byte(dir, n) - sbi->s_dirsize;
+ for (p = kaddr; p <= limit; p = minix_next_entry(p, sbi)) {
+ if (sbi->s_version == MINIX_V3) {
+ minix3_dirent *de3 = (minix3_dirent *)p;
+ namx = de3->name;
+ inumber = de3->inode;
+ } else {
+ minix_dirent *de = (minix_dirent *)p;
+ namx = de->name;
+ inumber = de->inode;
+ }
+ if (!inumber)
+ continue;
+ if (namecompare(namelen, sbi->s_namelen, name, namx))
+ goto found;
+ }
+ dir_put_page(page);
+ }
+ return NULL;
+
+found:
+ *res_page = page;
+ return (minix_dirent *)p;
+}
+
+int minix_add_link(struct dentry *dentry, struct inode *inode)
+{
+ struct inode *dir = d_inode(dentry->d_parent);
+ const char * name = dentry->d_name.name;
+ int namelen = dentry->d_name.len;
+ struct super_block * sb = dir->i_sb;
+ struct minix_sb_info * sbi = minix_sb(sb);
+ struct page *page = NULL;
+ unsigned long npages = dir_pages(dir);
+ unsigned long n;
+ char *kaddr, *p;
+ minix_dirent *de;
+ minix3_dirent *de3;
+ loff_t pos;
+ int err;
+ char *namx = NULL;
+ __u32 inumber;
+
+ /*
+ * We take care of directory expansion in the same loop
+ * This code plays outside i_size, so it locks the page
+ * to protect that region.
+ */
+ for (n = 0; n <= npages; n++) {
+ char *limit, *dir_end;
+
+ page = dir_get_page(dir, n);
+ err = PTR_ERR(page);
+ if (IS_ERR(page))
+ goto out;
+ lock_page(page);
+ kaddr = (char*)page_address(page);
+ dir_end = kaddr + minix_last_byte(dir, n);
+ limit = kaddr + PAGE_SIZE - sbi->s_dirsize;
+ for (p = kaddr; p <= limit; p = minix_next_entry(p, sbi)) {
+ de = (minix_dirent *)p;
+ de3 = (minix3_dirent *)p;
+ if (sbi->s_version == MINIX_V3) {
+ namx = de3->name;
+ inumber = de3->inode;
+ } else {
+ namx = de->name;
+ inumber = de->inode;
+ }
+ if (p == dir_end) {
+ /* We hit i_size */
+ if (sbi->s_version == MINIX_V3)
+ de3->inode = 0;
+ else
+ de->inode = 0;
+ goto got_it;
+ }
+ if (!inumber)
+ goto got_it;
+ err = -EEXIST;
+ if (namecompare(namelen, sbi->s_namelen, name, namx))
+ goto out_unlock;
+ }
+ unlock_page(page);
+ dir_put_page(page);
+ }
+ BUG();
+ return -EINVAL;
+
+got_it:
+ pos = page_offset(page) + p - (char *)page_address(page);
+ err = minix_prepare_chunk(page, pos, sbi->s_dirsize);
+ if (err)
+ goto out_unlock;
+ memcpy (namx, name, namelen);
+ if (sbi->s_version == MINIX_V3) {
+ memset (namx + namelen, 0, sbi->s_dirsize - namelen - 4);
+ de3->inode = inode->i_ino;
+ } else {
+ memset (namx + namelen, 0, sbi->s_dirsize - namelen - 2);
+ de->inode = inode->i_ino;
+ }
+ err = dir_commit_chunk(page, pos, sbi->s_dirsize);
+ dir->i_mtime = dir->i_ctime = current_time(dir);
+ mark_inode_dirty(dir);
+out_put:
+ dir_put_page(page);
+out:
+ return err;
+out_unlock:
+ unlock_page(page);
+ goto out_put;
+}
+
+int minix_delete_entry(struct minix_dir_entry *de, struct page *page)
+{
+ struct inode *inode = page->mapping->host;
+ char *kaddr = page_address(page);
+ loff_t pos = page_offset(page) + (char*)de - kaddr;
+ struct minix_sb_info *sbi = minix_sb(inode->i_sb);
+ unsigned len = sbi->s_dirsize;
+ int err;
+
+ lock_page(page);
+ err = minix_prepare_chunk(page, pos, len);
+ if (err == 0) {
+ if (sbi->s_version == MINIX_V3)
+ ((minix3_dirent *) de)->inode = 0;
+ else
+ de->inode = 0;
+ err = dir_commit_chunk(page, pos, len);
+ } else {
+ unlock_page(page);
+ }
+ dir_put_page(page);
+ inode->i_ctime = inode->i_mtime = current_time(inode);
+ mark_inode_dirty(inode);
+ return err;
+}
+
+int minix_make_empty(struct inode *inode, struct inode *dir)
+{
+ struct page *page = grab_cache_page(inode->i_mapping, 0);
+ struct minix_sb_info *sbi = minix_sb(inode->i_sb);
+ char *kaddr;
+ int err;
+
+ if (!page)
+ return -ENOMEM;
+ err = minix_prepare_chunk(page, 0, 2 * sbi->s_dirsize);
+ if (err) {
+ unlock_page(page);
+ goto fail;
+ }
+
+ kaddr = kmap_atomic(page);
+ memset(kaddr, 0, PAGE_SIZE);
+
+ if (sbi->s_version == MINIX_V3) {
+ minix3_dirent *de3 = (minix3_dirent *)kaddr;
+
+ de3->inode = inode->i_ino;
+ strcpy(de3->name, ".");
+ de3 = minix_next_entry(de3, sbi);
+ de3->inode = dir->i_ino;
+ strcpy(de3->name, "..");
+ } else {
+ minix_dirent *de = (minix_dirent *)kaddr;
+
+ de->inode = inode->i_ino;
+ strcpy(de->name, ".");
+ de = minix_next_entry(de, sbi);
+ de->inode = dir->i_ino;
+ strcpy(de->name, "..");
+ }
+ kunmap_atomic(kaddr);
+
+ err = dir_commit_chunk(page, 0, 2 * sbi->s_dirsize);
+fail:
+ put_page(page);
+ return err;
+}
+
+/*
+ * routine to check that the specified directory is empty (for rmdir)
+ */
+int minix_empty_dir(struct inode * inode)
+{
+ struct page *page = NULL;
+ unsigned long i, npages = dir_pages(inode);
+ struct minix_sb_info *sbi = minix_sb(inode->i_sb);
+ char *name;
+ __u32 inumber;
+
+ for (i = 0; i < npages; i++) {
+ char *p, *kaddr, *limit;
+
+ page = dir_get_page(inode, i);
+ if (IS_ERR(page))
+ continue;
+
+ kaddr = (char *)page_address(page);
+ limit = kaddr + minix_last_byte(inode, i) - sbi->s_dirsize;
+ for (p = kaddr; p <= limit; p = minix_next_entry(p, sbi)) {
+ if (sbi->s_version == MINIX_V3) {
+ minix3_dirent *de3 = (minix3_dirent *)p;
+ name = de3->name;
+ inumber = de3->inode;
+ } else {
+ minix_dirent *de = (minix_dirent *)p;
+ name = de->name;
+ inumber = de->inode;
+ }
+
+ if (inumber != 0) {
+ /* check for . and .. */
+ if (name[0] != '.')
+ goto not_empty;
+ if (!name[1]) {
+ if (inumber != inode->i_ino)
+ goto not_empty;
+ } else if (name[1] != '.')
+ goto not_empty;
+ else if (name[2])
+ goto not_empty;
+ }
+ }
+ dir_put_page(page);
+ }
+ return 1;
+
+not_empty:
+ dir_put_page(page);
+ return 0;
+}
+
+/* Releases the page */
+void minix_set_link(struct minix_dir_entry *de, struct page *page,
+ struct inode *inode)
+{
+ struct inode *dir = page->mapping->host;
+ struct minix_sb_info *sbi = minix_sb(dir->i_sb);
+ loff_t pos = page_offset(page) +
+ (char *)de-(char*)page_address(page);
+ int err;
+
+ lock_page(page);
+
+ err = minix_prepare_chunk(page, pos, sbi->s_dirsize);
+ if (err == 0) {
+ if (sbi->s_version == MINIX_V3)
+ ((minix3_dirent *) de)->inode = inode->i_ino;
+ else
+ de->inode = inode->i_ino;
+ err = dir_commit_chunk(page, pos, sbi->s_dirsize);
+ } else {
+ unlock_page(page);
+ }
+ dir_put_page(page);
+ dir->i_mtime = dir->i_ctime = current_time(dir);
+ mark_inode_dirty(dir);
+}
+
+struct minix_dir_entry * minix_dotdot (struct inode *dir, struct page **p)
+{
+ struct page *page = dir_get_page(dir, 0);
+ struct minix_sb_info *sbi = minix_sb(dir->i_sb);
+ struct minix_dir_entry *de = NULL;
+
+ if (!IS_ERR(page)) {
+ de = minix_next_entry(page_address(page), sbi);
+ *p = page;
+ }
+ return de;
+}
+
+ino_t minix_inode_by_name(struct dentry *dentry)
+{
+ struct page *page;
+ struct minix_dir_entry *de = minix_find_entry(dentry, &page);
+ ino_t res = 0;
+
+ if (de) {
+ struct address_space *mapping = page->mapping;
+ struct inode *inode = mapping->host;
+ struct minix_sb_info *sbi = minix_sb(inode->i_sb);
+
+ if (sbi->s_version == MINIX_V3)
+ res = ((minix3_dirent *) de)->inode;
+ else
+ res = de->inode;
+ dir_put_page(page);
+ }
+ return res;
+}