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![Linus Torvalds](/assets/img/avatar_default.png)
Current release - regressions: - sched: act_pedit: free pedit keys on bail from offset check Current release - new code bugs: - pds_core: - Kconfig fixes (DEBUGFS and AUXILIARY_BUS) - fix mutex double unlock in error path Previous releases - regressions: - sched: cls_api: remove block_cb from driver_list before freeing - nf_tables: fix ct untracked match breakage - eth: mtk_eth_soc: drop generic vlan rx offload - sched: flower: fix error handler on replace Previous releases - always broken: - tcp: fix skb_copy_ubufs() vs BIG TCP - ipv6: fix skb hash for some RST packets - af_packet: don't send zero-byte data in packet_sendmsg_spkt() - rxrpc: timeout handling fixes after moving client call connection to the I/O thread - ixgbe: fix panic during XDP_TX with > 64 CPUs - igc: RMW the SRRCTL register to prevent losing timestamp config - dsa: mt7530: fix corrupt frames using TRGMII on 40 MHz XTAL MT7621 - r8152: - fix flow control issue of RTL8156A - fix the poor throughput for 2.5G devices - move setting r8153b_rx_agg_chg_indicate() to fix coalescing - enable autosuspend - ncsi: clear Tx enable mode when handling a Config required AEN - octeontx2-pf: macsec: fixes for CN10KB ASIC rev Misc: - 9p: remove INET dependency Signed-off-by: Jakub Kicinski <kuba@kernel.org> -----BEGIN PGP SIGNATURE----- iQIzBAABCAAdFiEE6jPA+I1ugmIBA4hXMUZtbf5SIrsFAmRVeUIACgkQMUZtbf5S IrtTug/9Hhg/L0PTSwrfuGh4W1/cjheMWppNLkwyWQUiKG7FcZQ9vu9PxceE3VRu 2fTqHyvgDMZ8jACovXObeda8z1+g3s/tIPaXELephBIjVlF/h3kG2OaIzlU4jDb4 A4vklwf8eLbfyVBG22QgKl/I70zVMtnmnOo6c6CPuIOTcMPzslndFO9tB0nCg99F DCgCM1BBP1tz+OUch2rLnSzYcqkWqS49BhRk6dhYSliawUFU/5+1tDGDjwWolkfm 0jqP9DjBOSpZKO8m7SpsUNz7NFRIfYErWZ+YebWbggNxj/6TRJTP83MM0tGoK1rE /mz2xpuOki59frlwVOAD6gb/qefjHUp21P4NA7bnhizxFlQL5MHpCeGQ9yLHBSmY 9Q4ArJkM4jXQ0oDA2nII/pz+cDZGEWFGQ14WW3kYUb7WFmISH4I9OiA9i0TBW6OL r1Y/rqzkUvtKWzh9RpiAF9lsdHAm3SX9ES5RfMxzv0x886VOZR4jaMmokRDdPRzq 0r2Oyj75b62+X0r44Fe22Pl/kPS/uh3642xo9h85aAv/EvhT9JNzMvomJm9d6tkb 966I085AVbwxPAy+rl5SWyAq60EWDExNTjZvPv0mSMlmSsQ9iK5//xOF2Saw2zai /44zQ27tVGkCC44Ou5KmfJN3u4OrKkhcuyxtcDr9QeoOdKZRkMg= =9xND -----END PGP SIGNATURE----- Merge tag 'net-6.4-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net Pull networking fixes from Jakub Kicinski: "Including fixes from netfilter. Current release - regressions: - sched: act_pedit: free pedit keys on bail from offset check Current release - new code bugs: - pds_core: - Kconfig fixes (DEBUGFS and AUXILIARY_BUS) - fix mutex double unlock in error path Previous releases - regressions: - sched: cls_api: remove block_cb from driver_list before freeing - nf_tables: fix ct untracked match breakage - eth: mtk_eth_soc: drop generic vlan rx offload - sched: flower: fix error handler on replace Previous releases - always broken: - tcp: fix skb_copy_ubufs() vs BIG TCP - ipv6: fix skb hash for some RST packets - af_packet: don't send zero-byte data in packet_sendmsg_spkt() - rxrpc: timeout handling fixes after moving client call connection to the I/O thread - ixgbe: fix panic during XDP_TX with > 64 CPUs - igc: RMW the SRRCTL register to prevent losing timestamp config - dsa: mt7530: fix corrupt frames using TRGMII on 40 MHz XTAL MT7621 - r8152: - fix flow control issue of RTL8156A - fix the poor throughput for 2.5G devices - move setting r8153b_rx_agg_chg_indicate() to fix coalescing - enable autosuspend - ncsi: clear Tx enable mode when handling a Config required AEN - octeontx2-pf: macsec: fixes for CN10KB ASIC rev Misc: - 9p: remove INET dependency" * tag 'net-6.4-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net: (69 commits) net: bcmgenet: Remove phy_stop() from bcmgenet_netif_stop() pds_core: fix mutex double unlock in error path net/sched: flower: fix error handler on replace Revert "net/sched: flower: Fix wrong handle assignment during filter change" net/sched: flower: fix filter idr initialization net: fec: correct the counting of XDP sent frames bonding: add xdp_features support net: enetc: check the index of the SFI rather than the handle sfc: Add back mailing list virtio_net: suppress cpu stall when free_unused_bufs ice: block LAN in case of VF to VF offload net: dsa: mt7530: fix network connectivity with multiple CPU ports net: dsa: mt7530: fix corrupt frames using trgmii on 40 MHz XTAL MT7621 9p: Remove INET dependency netfilter: nf_tables: fix ct untracked match breakage af_packet: Don't send zero-byte data in packet_sendmsg_spkt(). igc: read before write to SRRCTL register pds_core: add AUXILIARY_BUS and NET_DEVLINK to Kconfig pds_core: remove CONFIG_DEBUG_FS from makefile ionic: catch failure from devlink_alloc ...
1461 lines
34 KiB
C
1461 lines
34 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* This file contains vfs inode ops for the 9P2000 protocol.
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*
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* Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
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* Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/fs.h>
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#include <linux/file.h>
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#include <linux/pagemap.h>
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#include <linux/stat.h>
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#include <linux/string.h>
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#include <linux/namei.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/xattr.h>
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#include <linux/posix_acl.h>
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#include <net/9p/9p.h>
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#include <net/9p/client.h>
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#include "v9fs.h"
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#include "v9fs_vfs.h"
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#include "fid.h"
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#include "cache.h"
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#include "xattr.h"
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#include "acl.h"
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static const struct inode_operations v9fs_dir_inode_operations;
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static const struct inode_operations v9fs_dir_inode_operations_dotu;
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static const struct inode_operations v9fs_file_inode_operations;
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static const struct inode_operations v9fs_symlink_inode_operations;
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/**
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* unixmode2p9mode - convert unix mode bits to plan 9
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* @v9ses: v9fs session information
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* @mode: mode to convert
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*
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*/
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static u32 unixmode2p9mode(struct v9fs_session_info *v9ses, umode_t mode)
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{
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int res;
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res = mode & 0777;
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if (S_ISDIR(mode))
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res |= P9_DMDIR;
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if (v9fs_proto_dotu(v9ses)) {
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if (v9ses->nodev == 0) {
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if (S_ISSOCK(mode))
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res |= P9_DMSOCKET;
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if (S_ISFIFO(mode))
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res |= P9_DMNAMEDPIPE;
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if (S_ISBLK(mode))
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res |= P9_DMDEVICE;
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if (S_ISCHR(mode))
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res |= P9_DMDEVICE;
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}
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if ((mode & S_ISUID) == S_ISUID)
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res |= P9_DMSETUID;
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if ((mode & S_ISGID) == S_ISGID)
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res |= P9_DMSETGID;
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if ((mode & S_ISVTX) == S_ISVTX)
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res |= P9_DMSETVTX;
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}
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return res;
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}
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/**
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* p9mode2perm- convert plan9 mode bits to unix permission bits
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* @v9ses: v9fs session information
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* @stat: p9_wstat from which mode need to be derived
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*
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*/
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static int p9mode2perm(struct v9fs_session_info *v9ses,
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struct p9_wstat *stat)
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{
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int res;
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int mode = stat->mode;
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res = mode & S_IALLUGO;
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if (v9fs_proto_dotu(v9ses)) {
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if ((mode & P9_DMSETUID) == P9_DMSETUID)
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res |= S_ISUID;
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if ((mode & P9_DMSETGID) == P9_DMSETGID)
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res |= S_ISGID;
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if ((mode & P9_DMSETVTX) == P9_DMSETVTX)
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res |= S_ISVTX;
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}
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return res;
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}
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/**
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* p9mode2unixmode- convert plan9 mode bits to unix mode bits
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* @v9ses: v9fs session information
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* @stat: p9_wstat from which mode need to be derived
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* @rdev: major number, minor number in case of device files.
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*
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*/
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static umode_t p9mode2unixmode(struct v9fs_session_info *v9ses,
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struct p9_wstat *stat, dev_t *rdev)
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{
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int res, r;
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u32 mode = stat->mode;
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*rdev = 0;
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res = p9mode2perm(v9ses, stat);
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if ((mode & P9_DMDIR) == P9_DMDIR)
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res |= S_IFDIR;
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else if ((mode & P9_DMSYMLINK) && (v9fs_proto_dotu(v9ses)))
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res |= S_IFLNK;
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else if ((mode & P9_DMSOCKET) && (v9fs_proto_dotu(v9ses))
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&& (v9ses->nodev == 0))
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res |= S_IFSOCK;
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else if ((mode & P9_DMNAMEDPIPE) && (v9fs_proto_dotu(v9ses))
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&& (v9ses->nodev == 0))
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res |= S_IFIFO;
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else if ((mode & P9_DMDEVICE) && (v9fs_proto_dotu(v9ses))
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&& (v9ses->nodev == 0)) {
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char type = 0;
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int major = -1, minor = -1;
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r = sscanf(stat->extension, "%c %i %i", &type, &major, &minor);
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if (r != 3) {
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p9_debug(P9_DEBUG_ERROR,
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"invalid device string, umode will be bogus: %s\n",
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stat->extension);
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return res;
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}
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switch (type) {
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case 'c':
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res |= S_IFCHR;
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break;
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case 'b':
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res |= S_IFBLK;
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break;
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default:
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p9_debug(P9_DEBUG_ERROR, "Unknown special type %c %s\n",
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type, stat->extension);
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}
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*rdev = MKDEV(major, minor);
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} else
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res |= S_IFREG;
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return res;
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}
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/**
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* v9fs_uflags2omode- convert posix open flags to plan 9 mode bits
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* @uflags: flags to convert
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* @extended: if .u extensions are active
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*/
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int v9fs_uflags2omode(int uflags, int extended)
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{
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int ret;
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ret = 0;
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switch (uflags&3) {
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default:
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case O_RDONLY:
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ret = P9_OREAD;
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break;
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case O_WRONLY:
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ret = P9_OWRITE;
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break;
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case O_RDWR:
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ret = P9_ORDWR;
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break;
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}
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if (extended) {
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if (uflags & O_EXCL)
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ret |= P9_OEXCL;
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if (uflags & O_APPEND)
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ret |= P9_OAPPEND;
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}
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return ret;
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}
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/**
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* v9fs_blank_wstat - helper function to setup a 9P stat structure
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* @wstat: structure to initialize
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*
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*/
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void
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v9fs_blank_wstat(struct p9_wstat *wstat)
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{
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wstat->type = ~0;
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wstat->dev = ~0;
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wstat->qid.type = ~0;
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wstat->qid.version = ~0;
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*((long long *)&wstat->qid.path) = ~0;
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wstat->mode = ~0;
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wstat->atime = ~0;
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wstat->mtime = ~0;
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wstat->length = ~0;
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wstat->name = NULL;
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wstat->uid = NULL;
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wstat->gid = NULL;
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wstat->muid = NULL;
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wstat->n_uid = INVALID_UID;
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wstat->n_gid = INVALID_GID;
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wstat->n_muid = INVALID_UID;
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wstat->extension = NULL;
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}
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/**
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* v9fs_alloc_inode - helper function to allocate an inode
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* @sb: The superblock to allocate the inode from
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*/
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struct inode *v9fs_alloc_inode(struct super_block *sb)
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{
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struct v9fs_inode *v9inode;
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v9inode = alloc_inode_sb(sb, v9fs_inode_cache, GFP_KERNEL);
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if (!v9inode)
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return NULL;
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v9inode->cache_validity = 0;
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mutex_init(&v9inode->v_mutex);
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return &v9inode->netfs.inode;
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}
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/**
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* v9fs_free_inode - destroy an inode
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* @inode: The inode to be freed
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*/
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void v9fs_free_inode(struct inode *inode)
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{
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kmem_cache_free(v9fs_inode_cache, V9FS_I(inode));
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}
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/*
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* Set parameters for the netfs library
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*/
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static void v9fs_set_netfs_context(struct inode *inode)
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{
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struct v9fs_inode *v9inode = V9FS_I(inode);
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netfs_inode_init(&v9inode->netfs, &v9fs_req_ops);
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}
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int v9fs_init_inode(struct v9fs_session_info *v9ses,
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struct inode *inode, umode_t mode, dev_t rdev)
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{
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int err = 0;
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inode_init_owner(&nop_mnt_idmap, inode, NULL, mode);
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inode->i_blocks = 0;
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inode->i_rdev = rdev;
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inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
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inode->i_mapping->a_ops = &v9fs_addr_operations;
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inode->i_private = NULL;
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switch (mode & S_IFMT) {
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case S_IFIFO:
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case S_IFBLK:
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case S_IFCHR:
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case S_IFSOCK:
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if (v9fs_proto_dotl(v9ses)) {
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inode->i_op = &v9fs_file_inode_operations_dotl;
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} else if (v9fs_proto_dotu(v9ses)) {
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inode->i_op = &v9fs_file_inode_operations;
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} else {
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p9_debug(P9_DEBUG_ERROR,
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"special files without extended mode\n");
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err = -EINVAL;
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goto error;
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}
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init_special_inode(inode, inode->i_mode, inode->i_rdev);
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break;
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case S_IFREG:
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if (v9fs_proto_dotl(v9ses)) {
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inode->i_op = &v9fs_file_inode_operations_dotl;
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inode->i_fop = &v9fs_file_operations_dotl;
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} else {
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inode->i_op = &v9fs_file_inode_operations;
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inode->i_fop = &v9fs_file_operations;
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}
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break;
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case S_IFLNK:
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if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) {
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p9_debug(P9_DEBUG_ERROR,
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"extended modes used with legacy protocol\n");
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err = -EINVAL;
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goto error;
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}
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if (v9fs_proto_dotl(v9ses))
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inode->i_op = &v9fs_symlink_inode_operations_dotl;
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else
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inode->i_op = &v9fs_symlink_inode_operations;
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break;
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case S_IFDIR:
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inc_nlink(inode);
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if (v9fs_proto_dotl(v9ses))
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inode->i_op = &v9fs_dir_inode_operations_dotl;
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else if (v9fs_proto_dotu(v9ses))
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inode->i_op = &v9fs_dir_inode_operations_dotu;
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else
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inode->i_op = &v9fs_dir_inode_operations;
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if (v9fs_proto_dotl(v9ses))
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inode->i_fop = &v9fs_dir_operations_dotl;
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else
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inode->i_fop = &v9fs_dir_operations;
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break;
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default:
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p9_debug(P9_DEBUG_ERROR, "BAD mode 0x%hx S_IFMT 0x%x\n",
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mode, mode & S_IFMT);
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err = -EINVAL;
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goto error;
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}
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v9fs_set_netfs_context(inode);
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error:
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return err;
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}
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/**
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* v9fs_get_inode - helper function to setup an inode
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* @sb: superblock
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* @mode: mode to setup inode with
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* @rdev: The device numbers to set
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*/
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struct inode *v9fs_get_inode(struct super_block *sb, umode_t mode, dev_t rdev)
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{
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int err;
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struct inode *inode;
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struct v9fs_session_info *v9ses = sb->s_fs_info;
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p9_debug(P9_DEBUG_VFS, "super block: %p mode: %ho\n", sb, mode);
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inode = new_inode(sb);
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if (!inode) {
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pr_warn("%s (%d): Problem allocating inode\n",
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__func__, task_pid_nr(current));
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return ERR_PTR(-ENOMEM);
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}
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err = v9fs_init_inode(v9ses, inode, mode, rdev);
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if (err) {
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iput(inode);
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return ERR_PTR(err);
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}
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return inode;
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}
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|
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/**
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* v9fs_evict_inode - Remove an inode from the inode cache
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* @inode: inode to release
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*
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*/
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void v9fs_evict_inode(struct inode *inode)
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{
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struct v9fs_inode __maybe_unused *v9inode = V9FS_I(inode);
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__le32 __maybe_unused version;
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truncate_inode_pages_final(&inode->i_data);
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|
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#ifdef CONFIG_9P_FSCACHE
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version = cpu_to_le32(v9inode->qid.version);
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fscache_clear_inode_writeback(v9fs_inode_cookie(v9inode), inode,
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&version);
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#endif
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|
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clear_inode(inode);
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filemap_fdatawrite(&inode->i_data);
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|
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#ifdef CONFIG_9P_FSCACHE
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fscache_relinquish_cookie(v9fs_inode_cookie(v9inode), false);
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#endif
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}
|
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|
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static int v9fs_test_inode(struct inode *inode, void *data)
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{
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int umode;
|
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dev_t rdev;
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struct v9fs_inode *v9inode = V9FS_I(inode);
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struct p9_wstat *st = (struct p9_wstat *)data;
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struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode);
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|
|
umode = p9mode2unixmode(v9ses, st, &rdev);
|
|
/* don't match inode of different type */
|
|
if (inode_wrong_type(inode, umode))
|
|
return 0;
|
|
|
|
/* compare qid details */
|
|
if (memcmp(&v9inode->qid.version,
|
|
&st->qid.version, sizeof(v9inode->qid.version)))
|
|
return 0;
|
|
|
|
if (v9inode->qid.type != st->qid.type)
|
|
return 0;
|
|
|
|
if (v9inode->qid.path != st->qid.path)
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
static int v9fs_test_new_inode(struct inode *inode, void *data)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int v9fs_set_inode(struct inode *inode, void *data)
|
|
{
|
|
struct v9fs_inode *v9inode = V9FS_I(inode);
|
|
struct p9_wstat *st = (struct p9_wstat *)data;
|
|
|
|
memcpy(&v9inode->qid, &st->qid, sizeof(st->qid));
|
|
return 0;
|
|
}
|
|
|
|
static struct inode *v9fs_qid_iget(struct super_block *sb,
|
|
struct p9_qid *qid,
|
|
struct p9_wstat *st,
|
|
int new)
|
|
{
|
|
dev_t rdev;
|
|
int retval;
|
|
umode_t umode;
|
|
unsigned long i_ino;
|
|
struct inode *inode;
|
|
struct v9fs_session_info *v9ses = sb->s_fs_info;
|
|
int (*test)(struct inode *inode, void *data);
|
|
|
|
if (new)
|
|
test = v9fs_test_new_inode;
|
|
else
|
|
test = v9fs_test_inode;
|
|
|
|
i_ino = v9fs_qid2ino(qid);
|
|
inode = iget5_locked(sb, i_ino, test, v9fs_set_inode, st);
|
|
if (!inode)
|
|
return ERR_PTR(-ENOMEM);
|
|
if (!(inode->i_state & I_NEW))
|
|
return inode;
|
|
/*
|
|
* initialize the inode with the stat info
|
|
* FIXME!! we may need support for stale inodes
|
|
* later.
|
|
*/
|
|
inode->i_ino = i_ino;
|
|
umode = p9mode2unixmode(v9ses, st, &rdev);
|
|
retval = v9fs_init_inode(v9ses, inode, umode, rdev);
|
|
if (retval)
|
|
goto error;
|
|
|
|
v9fs_stat2inode(st, inode, sb, 0);
|
|
v9fs_cache_inode_get_cookie(inode);
|
|
unlock_new_inode(inode);
|
|
return inode;
|
|
error:
|
|
iget_failed(inode);
|
|
return ERR_PTR(retval);
|
|
|
|
}
|
|
|
|
struct inode *
|
|
v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid,
|
|
struct super_block *sb, int new)
|
|
{
|
|
struct p9_wstat *st;
|
|
struct inode *inode = NULL;
|
|
|
|
st = p9_client_stat(fid);
|
|
if (IS_ERR(st))
|
|
return ERR_CAST(st);
|
|
|
|
inode = v9fs_qid_iget(sb, &st->qid, st, new);
|
|
p9stat_free(st);
|
|
kfree(st);
|
|
return inode;
|
|
}
|
|
|
|
/**
|
|
* v9fs_at_to_dotl_flags- convert Linux specific AT flags to
|
|
* plan 9 AT flag.
|
|
* @flags: flags to convert
|
|
*/
|
|
static int v9fs_at_to_dotl_flags(int flags)
|
|
{
|
|
int rflags = 0;
|
|
|
|
if (flags & AT_REMOVEDIR)
|
|
rflags |= P9_DOTL_AT_REMOVEDIR;
|
|
|
|
return rflags;
|
|
}
|
|
|
|
/**
|
|
* v9fs_dec_count - helper functon to drop i_nlink.
|
|
*
|
|
* If a directory had nlink <= 2 (including . and ..), then we should not drop
|
|
* the link count, which indicates the underlying exported fs doesn't maintain
|
|
* nlink accurately. e.g.
|
|
* - overlayfs sets nlink to 1 for merged dir
|
|
* - ext4 (with dir_nlink feature enabled) sets nlink to 1 if a dir has more
|
|
* than EXT4_LINK_MAX (65000) links.
|
|
*
|
|
* @inode: inode whose nlink is being dropped
|
|
*/
|
|
static void v9fs_dec_count(struct inode *inode)
|
|
{
|
|
if (!S_ISDIR(inode->i_mode) || inode->i_nlink > 2)
|
|
drop_nlink(inode);
|
|
}
|
|
|
|
/**
|
|
* v9fs_remove - helper function to remove files and directories
|
|
* @dir: directory inode that is being deleted
|
|
* @dentry: dentry that is being deleted
|
|
* @flags: removing a directory
|
|
*
|
|
*/
|
|
|
|
static int v9fs_remove(struct inode *dir, struct dentry *dentry, int flags)
|
|
{
|
|
struct inode *inode;
|
|
int retval = -EOPNOTSUPP;
|
|
struct p9_fid *v9fid, *dfid;
|
|
struct v9fs_session_info *v9ses;
|
|
|
|
p9_debug(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %x\n",
|
|
dir, dentry, flags);
|
|
|
|
v9ses = v9fs_inode2v9ses(dir);
|
|
inode = d_inode(dentry);
|
|
dfid = v9fs_parent_fid(dentry);
|
|
if (IS_ERR(dfid)) {
|
|
retval = PTR_ERR(dfid);
|
|
p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", retval);
|
|
return retval;
|
|
}
|
|
if (v9fs_proto_dotl(v9ses))
|
|
retval = p9_client_unlinkat(dfid, dentry->d_name.name,
|
|
v9fs_at_to_dotl_flags(flags));
|
|
p9_fid_put(dfid);
|
|
if (retval == -EOPNOTSUPP) {
|
|
/* Try the one based on path */
|
|
v9fid = v9fs_fid_clone(dentry);
|
|
if (IS_ERR(v9fid))
|
|
return PTR_ERR(v9fid);
|
|
retval = p9_client_remove(v9fid);
|
|
}
|
|
if (!retval) {
|
|
/*
|
|
* directories on unlink should have zero
|
|
* link count
|
|
*/
|
|
if (flags & AT_REMOVEDIR) {
|
|
clear_nlink(inode);
|
|
v9fs_dec_count(dir);
|
|
} else
|
|
v9fs_dec_count(inode);
|
|
|
|
v9fs_invalidate_inode_attr(inode);
|
|
v9fs_invalidate_inode_attr(dir);
|
|
|
|
/* invalidate all fids associated with dentry */
|
|
/* NOTE: This will not include open fids */
|
|
dentry->d_op->d_release(dentry);
|
|
}
|
|
return retval;
|
|
}
|
|
|
|
/**
|
|
* v9fs_create - Create a file
|
|
* @v9ses: session information
|
|
* @dir: directory that dentry is being created in
|
|
* @dentry: dentry that is being created
|
|
* @extension: 9p2000.u extension string to support devices, etc.
|
|
* @perm: create permissions
|
|
* @mode: open mode
|
|
*
|
|
*/
|
|
static struct p9_fid *
|
|
v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir,
|
|
struct dentry *dentry, char *extension, u32 perm, u8 mode)
|
|
{
|
|
int err;
|
|
const unsigned char *name;
|
|
struct p9_fid *dfid, *ofid = NULL, *fid = NULL;
|
|
struct inode *inode;
|
|
|
|
p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry);
|
|
|
|
err = 0;
|
|
name = dentry->d_name.name;
|
|
dfid = v9fs_parent_fid(dentry);
|
|
if (IS_ERR(dfid)) {
|
|
err = PTR_ERR(dfid);
|
|
p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
/* clone a fid to use for creation */
|
|
ofid = clone_fid(dfid);
|
|
if (IS_ERR(ofid)) {
|
|
err = PTR_ERR(ofid);
|
|
p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
|
|
goto error;
|
|
}
|
|
|
|
err = p9_client_fcreate(ofid, name, perm, mode, extension);
|
|
if (err < 0) {
|
|
p9_debug(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err);
|
|
goto error;
|
|
}
|
|
|
|
if (!(perm & P9_DMLINK)) {
|
|
/* now walk from the parent so we can get unopened fid */
|
|
fid = p9_client_walk(dfid, 1, &name, 1);
|
|
if (IS_ERR(fid)) {
|
|
err = PTR_ERR(fid);
|
|
p9_debug(P9_DEBUG_VFS,
|
|
"p9_client_walk failed %d\n", err);
|
|
goto error;
|
|
}
|
|
/*
|
|
* instantiate inode and assign the unopened fid to the dentry
|
|
*/
|
|
inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
|
|
if (IS_ERR(inode)) {
|
|
err = PTR_ERR(inode);
|
|
p9_debug(P9_DEBUG_VFS,
|
|
"inode creation failed %d\n", err);
|
|
goto error;
|
|
}
|
|
v9fs_fid_add(dentry, &fid);
|
|
d_instantiate(dentry, inode);
|
|
}
|
|
p9_fid_put(dfid);
|
|
return ofid;
|
|
error:
|
|
p9_fid_put(dfid);
|
|
p9_fid_put(ofid);
|
|
p9_fid_put(fid);
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
/**
|
|
* v9fs_vfs_create - VFS hook to create a regular file
|
|
* @idmap: idmap of the mount
|
|
* @dir: The parent directory
|
|
* @dentry: The name of file to be created
|
|
* @mode: The UNIX file mode to set
|
|
* @excl: True if the file must not yet exist
|
|
*
|
|
* open(.., O_CREAT) is handled in v9fs_vfs_atomic_open(). This is only called
|
|
* for mknod(2).
|
|
*
|
|
*/
|
|
|
|
static int
|
|
v9fs_vfs_create(struct mnt_idmap *idmap, struct inode *dir,
|
|
struct dentry *dentry, umode_t mode, bool excl)
|
|
{
|
|
struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
|
|
u32 perm = unixmode2p9mode(v9ses, mode);
|
|
struct p9_fid *fid;
|
|
|
|
/* P9_OEXCL? */
|
|
fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_ORDWR);
|
|
if (IS_ERR(fid))
|
|
return PTR_ERR(fid);
|
|
|
|
v9fs_invalidate_inode_attr(dir);
|
|
p9_fid_put(fid);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* v9fs_vfs_mkdir - VFS mkdir hook to create a directory
|
|
* @idmap: idmap of the mount
|
|
* @dir: inode that is being unlinked
|
|
* @dentry: dentry that is being unlinked
|
|
* @mode: mode for new directory
|
|
*
|
|
*/
|
|
|
|
static int v9fs_vfs_mkdir(struct mnt_idmap *idmap, struct inode *dir,
|
|
struct dentry *dentry, umode_t mode)
|
|
{
|
|
int err;
|
|
u32 perm;
|
|
struct p9_fid *fid;
|
|
struct v9fs_session_info *v9ses;
|
|
|
|
p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry);
|
|
err = 0;
|
|
v9ses = v9fs_inode2v9ses(dir);
|
|
perm = unixmode2p9mode(v9ses, mode | S_IFDIR);
|
|
fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD);
|
|
if (IS_ERR(fid)) {
|
|
err = PTR_ERR(fid);
|
|
fid = NULL;
|
|
} else {
|
|
inc_nlink(dir);
|
|
v9fs_invalidate_inode_attr(dir);
|
|
}
|
|
|
|
if (fid)
|
|
p9_fid_put(fid);
|
|
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode
|
|
* @dir: inode that is being walked from
|
|
* @dentry: dentry that is being walked to?
|
|
* @flags: lookup flags (unused)
|
|
*
|
|
*/
|
|
|
|
struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
|
|
unsigned int flags)
|
|
{
|
|
struct dentry *res;
|
|
struct v9fs_session_info *v9ses;
|
|
struct p9_fid *dfid, *fid;
|
|
struct inode *inode;
|
|
const unsigned char *name;
|
|
|
|
p9_debug(P9_DEBUG_VFS, "dir: %p dentry: (%pd) %p flags: %x\n",
|
|
dir, dentry, dentry, flags);
|
|
|
|
if (dentry->d_name.len > NAME_MAX)
|
|
return ERR_PTR(-ENAMETOOLONG);
|
|
|
|
v9ses = v9fs_inode2v9ses(dir);
|
|
/* We can walk d_parent because we hold the dir->i_mutex */
|
|
dfid = v9fs_parent_fid(dentry);
|
|
if (IS_ERR(dfid))
|
|
return ERR_CAST(dfid);
|
|
|
|
/*
|
|
* Make sure we don't use a wrong inode due to parallel
|
|
* unlink. For cached mode create calls request for new
|
|
* inode. But with cache disabled, lookup should do this.
|
|
*/
|
|
name = dentry->d_name.name;
|
|
fid = p9_client_walk(dfid, 1, &name, 1);
|
|
p9_fid_put(dfid);
|
|
if (fid == ERR_PTR(-ENOENT))
|
|
inode = NULL;
|
|
else if (IS_ERR(fid))
|
|
inode = ERR_CAST(fid);
|
|
else if (v9ses->cache & (CACHE_META|CACHE_LOOSE))
|
|
inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
|
|
else
|
|
inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
|
|
/*
|
|
* If we had a rename on the server and a parallel lookup
|
|
* for the new name, then make sure we instantiate with
|
|
* the new name. ie look up for a/b, while on server somebody
|
|
* moved b under k and client parallely did a lookup for
|
|
* k/b.
|
|
*/
|
|
res = d_splice_alias(inode, dentry);
|
|
if (!IS_ERR(fid)) {
|
|
if (!res)
|
|
v9fs_fid_add(dentry, &fid);
|
|
else if (!IS_ERR(res))
|
|
v9fs_fid_add(res, &fid);
|
|
else
|
|
p9_fid_put(fid);
|
|
}
|
|
return res;
|
|
}
|
|
|
|
static int
|
|
v9fs_vfs_atomic_open(struct inode *dir, struct dentry *dentry,
|
|
struct file *file, unsigned int flags, umode_t mode)
|
|
{
|
|
int err;
|
|
u32 perm;
|
|
struct v9fs_inode __maybe_unused *v9inode;
|
|
struct v9fs_session_info *v9ses;
|
|
struct p9_fid *fid;
|
|
struct dentry *res = NULL;
|
|
struct inode *inode;
|
|
int p9_omode;
|
|
|
|
if (d_in_lookup(dentry)) {
|
|
res = v9fs_vfs_lookup(dir, dentry, 0);
|
|
if (IS_ERR(res))
|
|
return PTR_ERR(res);
|
|
|
|
if (res)
|
|
dentry = res;
|
|
}
|
|
|
|
/* Only creates */
|
|
if (!(flags & O_CREAT) || d_really_is_positive(dentry))
|
|
return finish_no_open(file, res);
|
|
|
|
err = 0;
|
|
|
|
v9ses = v9fs_inode2v9ses(dir);
|
|
perm = unixmode2p9mode(v9ses, mode);
|
|
p9_omode = v9fs_uflags2omode(flags, v9fs_proto_dotu(v9ses));
|
|
|
|
if ((v9ses->cache & CACHE_WRITEBACK) && (p9_omode & P9_OWRITE)) {
|
|
p9_omode = (p9_omode & ~P9_OWRITE) | P9_ORDWR;
|
|
p9_debug(P9_DEBUG_CACHE,
|
|
"write-only file with writeback enabled, creating w/ O_RDWR\n");
|
|
}
|
|
fid = v9fs_create(v9ses, dir, dentry, NULL, perm, p9_omode);
|
|
if (IS_ERR(fid)) {
|
|
err = PTR_ERR(fid);
|
|
goto error;
|
|
}
|
|
|
|
v9fs_invalidate_inode_attr(dir);
|
|
inode = d_inode(dentry);
|
|
v9inode = V9FS_I(inode);
|
|
err = finish_open(file, dentry, generic_file_open);
|
|
if (err)
|
|
goto error;
|
|
|
|
file->private_data = fid;
|
|
#ifdef CONFIG_9P_FSCACHE
|
|
if (v9ses->cache & CACHE_FSCACHE)
|
|
fscache_use_cookie(v9fs_inode_cookie(v9inode),
|
|
file->f_mode & FMODE_WRITE);
|
|
#endif
|
|
|
|
v9fs_fid_add_modes(fid, v9ses->flags, v9ses->cache, file->f_flags);
|
|
v9fs_open_fid_add(inode, &fid);
|
|
|
|
file->f_mode |= FMODE_CREATED;
|
|
out:
|
|
dput(res);
|
|
return err;
|
|
|
|
error:
|
|
p9_fid_put(fid);
|
|
goto out;
|
|
}
|
|
|
|
/**
|
|
* v9fs_vfs_unlink - VFS unlink hook to delete an inode
|
|
* @i: inode that is being unlinked
|
|
* @d: dentry that is being unlinked
|
|
*
|
|
*/
|
|
|
|
int v9fs_vfs_unlink(struct inode *i, struct dentry *d)
|
|
{
|
|
return v9fs_remove(i, d, 0);
|
|
}
|
|
|
|
/**
|
|
* v9fs_vfs_rmdir - VFS unlink hook to delete a directory
|
|
* @i: inode that is being unlinked
|
|
* @d: dentry that is being unlinked
|
|
*
|
|
*/
|
|
|
|
int v9fs_vfs_rmdir(struct inode *i, struct dentry *d)
|
|
{
|
|
return v9fs_remove(i, d, AT_REMOVEDIR);
|
|
}
|
|
|
|
/**
|
|
* v9fs_vfs_rename - VFS hook to rename an inode
|
|
* @idmap: The idmap of the mount
|
|
* @old_dir: old dir inode
|
|
* @old_dentry: old dentry
|
|
* @new_dir: new dir inode
|
|
* @new_dentry: new dentry
|
|
* @flags: RENAME_* flags
|
|
*
|
|
*/
|
|
|
|
int
|
|
v9fs_vfs_rename(struct mnt_idmap *idmap, struct inode *old_dir,
|
|
struct dentry *old_dentry, struct inode *new_dir,
|
|
struct dentry *new_dentry, unsigned int flags)
|
|
{
|
|
int retval;
|
|
struct inode *old_inode;
|
|
struct inode *new_inode;
|
|
struct v9fs_session_info *v9ses;
|
|
struct p9_fid *oldfid = NULL, *dfid = NULL;
|
|
struct p9_fid *olddirfid = NULL;
|
|
struct p9_fid *newdirfid = NULL;
|
|
struct p9_wstat wstat;
|
|
|
|
if (flags)
|
|
return -EINVAL;
|
|
|
|
p9_debug(P9_DEBUG_VFS, "\n");
|
|
retval = 0;
|
|
old_inode = d_inode(old_dentry);
|
|
new_inode = d_inode(new_dentry);
|
|
v9ses = v9fs_inode2v9ses(old_inode);
|
|
oldfid = v9fs_fid_lookup(old_dentry);
|
|
if (IS_ERR(oldfid))
|
|
return PTR_ERR(oldfid);
|
|
|
|
dfid = v9fs_parent_fid(old_dentry);
|
|
olddirfid = clone_fid(dfid);
|
|
p9_fid_put(dfid);
|
|
dfid = NULL;
|
|
|
|
if (IS_ERR(olddirfid)) {
|
|
retval = PTR_ERR(olddirfid);
|
|
goto error;
|
|
}
|
|
|
|
dfid = v9fs_parent_fid(new_dentry);
|
|
newdirfid = clone_fid(dfid);
|
|
p9_fid_put(dfid);
|
|
dfid = NULL;
|
|
|
|
if (IS_ERR(newdirfid)) {
|
|
retval = PTR_ERR(newdirfid);
|
|
goto error;
|
|
}
|
|
|
|
down_write(&v9ses->rename_sem);
|
|
if (v9fs_proto_dotl(v9ses)) {
|
|
retval = p9_client_renameat(olddirfid, old_dentry->d_name.name,
|
|
newdirfid, new_dentry->d_name.name);
|
|
if (retval == -EOPNOTSUPP)
|
|
retval = p9_client_rename(oldfid, newdirfid,
|
|
new_dentry->d_name.name);
|
|
if (retval != -EOPNOTSUPP)
|
|
goto error_locked;
|
|
}
|
|
if (old_dentry->d_parent != new_dentry->d_parent) {
|
|
/*
|
|
* 9P .u can only handle file rename in the same directory
|
|
*/
|
|
|
|
p9_debug(P9_DEBUG_ERROR, "old dir and new dir are different\n");
|
|
retval = -EXDEV;
|
|
goto error_locked;
|
|
}
|
|
v9fs_blank_wstat(&wstat);
|
|
wstat.muid = v9ses->uname;
|
|
wstat.name = new_dentry->d_name.name;
|
|
retval = p9_client_wstat(oldfid, &wstat);
|
|
|
|
error_locked:
|
|
if (!retval) {
|
|
if (new_inode) {
|
|
if (S_ISDIR(new_inode->i_mode))
|
|
clear_nlink(new_inode);
|
|
else
|
|
v9fs_dec_count(new_inode);
|
|
}
|
|
if (S_ISDIR(old_inode->i_mode)) {
|
|
if (!new_inode)
|
|
inc_nlink(new_dir);
|
|
v9fs_dec_count(old_dir);
|
|
}
|
|
v9fs_invalidate_inode_attr(old_inode);
|
|
v9fs_invalidate_inode_attr(old_dir);
|
|
v9fs_invalidate_inode_attr(new_dir);
|
|
|
|
/* successful rename */
|
|
d_move(old_dentry, new_dentry);
|
|
}
|
|
up_write(&v9ses->rename_sem);
|
|
|
|
error:
|
|
p9_fid_put(newdirfid);
|
|
p9_fid_put(olddirfid);
|
|
p9_fid_put(oldfid);
|
|
return retval;
|
|
}
|
|
|
|
/**
|
|
* v9fs_vfs_getattr - retrieve file metadata
|
|
* @idmap: idmap of the mount
|
|
* @path: Object to query
|
|
* @stat: metadata structure to populate
|
|
* @request_mask: Mask of STATX_xxx flags indicating the caller's interests
|
|
* @flags: AT_STATX_xxx setting
|
|
*
|
|
*/
|
|
|
|
static int
|
|
v9fs_vfs_getattr(struct mnt_idmap *idmap, const struct path *path,
|
|
struct kstat *stat, u32 request_mask, unsigned int flags)
|
|
{
|
|
struct dentry *dentry = path->dentry;
|
|
struct inode *inode = d_inode(dentry);
|
|
struct v9fs_session_info *v9ses;
|
|
struct p9_fid *fid;
|
|
struct p9_wstat *st;
|
|
|
|
p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
|
|
v9ses = v9fs_dentry2v9ses(dentry);
|
|
if (v9ses->cache & (CACHE_META|CACHE_LOOSE)) {
|
|
generic_fillattr(&nop_mnt_idmap, inode, stat);
|
|
return 0;
|
|
} else if (v9ses->cache & CACHE_WRITEBACK) {
|
|
if (S_ISREG(inode->i_mode)) {
|
|
int retval = filemap_fdatawrite(inode->i_mapping);
|
|
|
|
if (retval)
|
|
p9_debug(P9_DEBUG_ERROR,
|
|
"flushing writeback during getattr returned %d\n", retval);
|
|
}
|
|
}
|
|
fid = v9fs_fid_lookup(dentry);
|
|
if (IS_ERR(fid))
|
|
return PTR_ERR(fid);
|
|
|
|
st = p9_client_stat(fid);
|
|
p9_fid_put(fid);
|
|
if (IS_ERR(st))
|
|
return PTR_ERR(st);
|
|
|
|
v9fs_stat2inode(st, d_inode(dentry), dentry->d_sb, 0);
|
|
generic_fillattr(&nop_mnt_idmap, d_inode(dentry), stat);
|
|
|
|
p9stat_free(st);
|
|
kfree(st);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* v9fs_vfs_setattr - set file metadata
|
|
* @idmap: idmap of the mount
|
|
* @dentry: file whose metadata to set
|
|
* @iattr: metadata assignment structure
|
|
*
|
|
*/
|
|
|
|
static int v9fs_vfs_setattr(struct mnt_idmap *idmap,
|
|
struct dentry *dentry, struct iattr *iattr)
|
|
{
|
|
int retval, use_dentry = 0;
|
|
struct inode *inode = d_inode(dentry);
|
|
struct v9fs_session_info *v9ses;
|
|
struct p9_fid *fid = NULL;
|
|
struct p9_wstat wstat;
|
|
|
|
p9_debug(P9_DEBUG_VFS, "\n");
|
|
retval = setattr_prepare(&nop_mnt_idmap, dentry, iattr);
|
|
if (retval)
|
|
return retval;
|
|
|
|
retval = -EPERM;
|
|
v9ses = v9fs_dentry2v9ses(dentry);
|
|
if (iattr->ia_valid & ATTR_FILE) {
|
|
fid = iattr->ia_file->private_data;
|
|
WARN_ON(!fid);
|
|
}
|
|
if (!fid) {
|
|
fid = v9fs_fid_lookup(dentry);
|
|
use_dentry = 1;
|
|
}
|
|
if (IS_ERR(fid))
|
|
return PTR_ERR(fid);
|
|
|
|
v9fs_blank_wstat(&wstat);
|
|
if (iattr->ia_valid & ATTR_MODE)
|
|
wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode);
|
|
|
|
if (iattr->ia_valid & ATTR_MTIME)
|
|
wstat.mtime = iattr->ia_mtime.tv_sec;
|
|
|
|
if (iattr->ia_valid & ATTR_ATIME)
|
|
wstat.atime = iattr->ia_atime.tv_sec;
|
|
|
|
if (iattr->ia_valid & ATTR_SIZE)
|
|
wstat.length = iattr->ia_size;
|
|
|
|
if (v9fs_proto_dotu(v9ses)) {
|
|
if (iattr->ia_valid & ATTR_UID)
|
|
wstat.n_uid = iattr->ia_uid;
|
|
|
|
if (iattr->ia_valid & ATTR_GID)
|
|
wstat.n_gid = iattr->ia_gid;
|
|
}
|
|
|
|
/* Write all dirty data */
|
|
if (d_is_reg(dentry)) {
|
|
retval = filemap_fdatawrite(inode->i_mapping);
|
|
if (retval)
|
|
p9_debug(P9_DEBUG_ERROR,
|
|
"flushing writeback during setattr returned %d\n", retval);
|
|
}
|
|
|
|
retval = p9_client_wstat(fid, &wstat);
|
|
|
|
if (use_dentry)
|
|
p9_fid_put(fid);
|
|
|
|
if (retval < 0)
|
|
return retval;
|
|
|
|
if ((iattr->ia_valid & ATTR_SIZE) &&
|
|
iattr->ia_size != i_size_read(inode)) {
|
|
truncate_setsize(inode, iattr->ia_size);
|
|
truncate_pagecache(inode, iattr->ia_size);
|
|
|
|
#ifdef CONFIG_9P_FSCACHE
|
|
if (v9ses->cache & CACHE_FSCACHE) {
|
|
struct v9fs_inode *v9inode = V9FS_I(inode);
|
|
|
|
fscache_resize_cookie(v9fs_inode_cookie(v9inode), iattr->ia_size);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
v9fs_invalidate_inode_attr(inode);
|
|
|
|
setattr_copy(&nop_mnt_idmap, inode, iattr);
|
|
mark_inode_dirty(inode);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* v9fs_stat2inode - populate an inode structure with mistat info
|
|
* @stat: Plan 9 metadata (mistat) structure
|
|
* @inode: inode to populate
|
|
* @sb: superblock of filesystem
|
|
* @flags: control flags (e.g. V9FS_STAT2INODE_KEEP_ISIZE)
|
|
*
|
|
*/
|
|
|
|
void
|
|
v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode,
|
|
struct super_block *sb, unsigned int flags)
|
|
{
|
|
umode_t mode;
|
|
struct v9fs_session_info *v9ses = sb->s_fs_info;
|
|
struct v9fs_inode *v9inode = V9FS_I(inode);
|
|
|
|
set_nlink(inode, 1);
|
|
|
|
inode->i_atime.tv_sec = stat->atime;
|
|
inode->i_mtime.tv_sec = stat->mtime;
|
|
inode->i_ctime.tv_sec = stat->mtime;
|
|
|
|
inode->i_uid = v9ses->dfltuid;
|
|
inode->i_gid = v9ses->dfltgid;
|
|
|
|
if (v9fs_proto_dotu(v9ses)) {
|
|
inode->i_uid = stat->n_uid;
|
|
inode->i_gid = stat->n_gid;
|
|
}
|
|
if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) {
|
|
if (v9fs_proto_dotu(v9ses)) {
|
|
unsigned int i_nlink;
|
|
/*
|
|
* Hadlink support got added later to the .u extension.
|
|
* So there can be a server out there that doesn't
|
|
* support this even with .u extension. That would
|
|
* just leave us with stat->extension being an empty
|
|
* string, though.
|
|
*/
|
|
/* HARDLINKCOUNT %u */
|
|
if (sscanf(stat->extension,
|
|
" HARDLINKCOUNT %u", &i_nlink) == 1)
|
|
set_nlink(inode, i_nlink);
|
|
}
|
|
}
|
|
mode = p9mode2perm(v9ses, stat);
|
|
mode |= inode->i_mode & ~S_IALLUGO;
|
|
inode->i_mode = mode;
|
|
|
|
if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE))
|
|
v9fs_i_size_write(inode, stat->length);
|
|
/* not real number of blocks, but 512 byte ones ... */
|
|
inode->i_blocks = (stat->length + 512 - 1) >> 9;
|
|
v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
|
|
}
|
|
|
|
/**
|
|
* v9fs_qid2ino - convert qid into inode number
|
|
* @qid: qid to hash
|
|
*
|
|
* BUG: potential for inode number collisions?
|
|
*/
|
|
|
|
ino_t v9fs_qid2ino(struct p9_qid *qid)
|
|
{
|
|
u64 path = qid->path + 2;
|
|
ino_t i = 0;
|
|
|
|
if (sizeof(ino_t) == sizeof(path))
|
|
memcpy(&i, &path, sizeof(ino_t));
|
|
else
|
|
i = (ino_t) (path ^ (path >> 32));
|
|
|
|
return i;
|
|
}
|
|
|
|
/**
|
|
* v9fs_vfs_get_link - follow a symlink path
|
|
* @dentry: dentry for symlink
|
|
* @inode: inode for symlink
|
|
* @done: delayed call for when we are done with the return value
|
|
*/
|
|
|
|
static const char *v9fs_vfs_get_link(struct dentry *dentry,
|
|
struct inode *inode,
|
|
struct delayed_call *done)
|
|
{
|
|
struct v9fs_session_info *v9ses;
|
|
struct p9_fid *fid;
|
|
struct p9_wstat *st;
|
|
char *res;
|
|
|
|
if (!dentry)
|
|
return ERR_PTR(-ECHILD);
|
|
|
|
v9ses = v9fs_dentry2v9ses(dentry);
|
|
if (!v9fs_proto_dotu(v9ses))
|
|
return ERR_PTR(-EBADF);
|
|
|
|
p9_debug(P9_DEBUG_VFS, "%pd\n", dentry);
|
|
fid = v9fs_fid_lookup(dentry);
|
|
|
|
if (IS_ERR(fid))
|
|
return ERR_CAST(fid);
|
|
|
|
st = p9_client_stat(fid);
|
|
p9_fid_put(fid);
|
|
if (IS_ERR(st))
|
|
return ERR_CAST(st);
|
|
|
|
if (!(st->mode & P9_DMSYMLINK)) {
|
|
p9stat_free(st);
|
|
kfree(st);
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
res = st->extension;
|
|
st->extension = NULL;
|
|
if (strlen(res) >= PATH_MAX)
|
|
res[PATH_MAX - 1] = '\0';
|
|
|
|
p9stat_free(st);
|
|
kfree(st);
|
|
set_delayed_call(done, kfree_link, res);
|
|
return res;
|
|
}
|
|
|
|
/**
|
|
* v9fs_vfs_mkspecial - create a special file
|
|
* @dir: inode to create special file in
|
|
* @dentry: dentry to create
|
|
* @perm: mode to create special file
|
|
* @extension: 9p2000.u format extension string representing special file
|
|
*
|
|
*/
|
|
|
|
static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry,
|
|
u32 perm, const char *extension)
|
|
{
|
|
struct p9_fid *fid;
|
|
struct v9fs_session_info *v9ses;
|
|
|
|
v9ses = v9fs_inode2v9ses(dir);
|
|
if (!v9fs_proto_dotu(v9ses)) {
|
|
p9_debug(P9_DEBUG_ERROR, "not extended\n");
|
|
return -EPERM;
|
|
}
|
|
|
|
fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm,
|
|
P9_OREAD);
|
|
if (IS_ERR(fid))
|
|
return PTR_ERR(fid);
|
|
|
|
v9fs_invalidate_inode_attr(dir);
|
|
p9_fid_put(fid);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* v9fs_vfs_symlink - helper function to create symlinks
|
|
* @idmap: idmap of the mount
|
|
* @dir: directory inode containing symlink
|
|
* @dentry: dentry for symlink
|
|
* @symname: symlink data
|
|
*
|
|
* See Also: 9P2000.u RFC for more information
|
|
*
|
|
*/
|
|
|
|
static int
|
|
v9fs_vfs_symlink(struct mnt_idmap *idmap, struct inode *dir,
|
|
struct dentry *dentry, const char *symname)
|
|
{
|
|
p9_debug(P9_DEBUG_VFS, " %lu,%pd,%s\n",
|
|
dir->i_ino, dentry, symname);
|
|
|
|
return v9fs_vfs_mkspecial(dir, dentry, P9_DMSYMLINK, symname);
|
|
}
|
|
|
|
#define U32_MAX_DIGITS 10
|
|
|
|
/**
|
|
* v9fs_vfs_link - create a hardlink
|
|
* @old_dentry: dentry for file to link to
|
|
* @dir: inode destination for new link
|
|
* @dentry: dentry for link
|
|
*
|
|
*/
|
|
|
|
static int
|
|
v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir,
|
|
struct dentry *dentry)
|
|
{
|
|
int retval;
|
|
char name[1 + U32_MAX_DIGITS + 2]; /* sign + number + \n + \0 */
|
|
struct p9_fid *oldfid;
|
|
|
|
p9_debug(P9_DEBUG_VFS, " %lu,%pd,%pd\n",
|
|
dir->i_ino, dentry, old_dentry);
|
|
|
|
oldfid = v9fs_fid_clone(old_dentry);
|
|
if (IS_ERR(oldfid))
|
|
return PTR_ERR(oldfid);
|
|
|
|
sprintf(name, "%d\n", oldfid->fid);
|
|
retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name);
|
|
if (!retval) {
|
|
v9fs_refresh_inode(oldfid, d_inode(old_dentry));
|
|
v9fs_invalidate_inode_attr(dir);
|
|
}
|
|
p9_fid_put(oldfid);
|
|
return retval;
|
|
}
|
|
|
|
/**
|
|
* v9fs_vfs_mknod - create a special file
|
|
* @idmap: idmap of the mount
|
|
* @dir: inode destination for new link
|
|
* @dentry: dentry for file
|
|
* @mode: mode for creation
|
|
* @rdev: device associated with special file
|
|
*
|
|
*/
|
|
|
|
static int
|
|
v9fs_vfs_mknod(struct mnt_idmap *idmap, struct inode *dir,
|
|
struct dentry *dentry, umode_t mode, dev_t rdev)
|
|
{
|
|
struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
|
|
int retval;
|
|
char name[2 + U32_MAX_DIGITS + 1 + U32_MAX_DIGITS + 1];
|
|
u32 perm;
|
|
|
|
p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %x MAJOR: %u MINOR: %u\n",
|
|
dir->i_ino, dentry, mode,
|
|
MAJOR(rdev), MINOR(rdev));
|
|
|
|
/* build extension */
|
|
if (S_ISBLK(mode))
|
|
sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev));
|
|
else if (S_ISCHR(mode))
|
|
sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev));
|
|
else
|
|
*name = 0;
|
|
|
|
perm = unixmode2p9mode(v9ses, mode);
|
|
retval = v9fs_vfs_mkspecial(dir, dentry, perm, name);
|
|
|
|
return retval;
|
|
}
|
|
|
|
int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode)
|
|
{
|
|
int umode;
|
|
dev_t rdev;
|
|
struct p9_wstat *st;
|
|
struct v9fs_session_info *v9ses;
|
|
unsigned int flags;
|
|
|
|
v9ses = v9fs_inode2v9ses(inode);
|
|
st = p9_client_stat(fid);
|
|
if (IS_ERR(st))
|
|
return PTR_ERR(st);
|
|
/*
|
|
* Don't update inode if the file type is different
|
|
*/
|
|
umode = p9mode2unixmode(v9ses, st, &rdev);
|
|
if (inode_wrong_type(inode, umode))
|
|
goto out;
|
|
|
|
/*
|
|
* We don't want to refresh inode->i_size,
|
|
* because we may have cached data
|
|
*/
|
|
flags = (v9ses->cache & CACHE_LOOSE) ?
|
|
V9FS_STAT2INODE_KEEP_ISIZE : 0;
|
|
v9fs_stat2inode(st, inode, inode->i_sb, flags);
|
|
out:
|
|
p9stat_free(st);
|
|
kfree(st);
|
|
return 0;
|
|
}
|
|
|
|
static const struct inode_operations v9fs_dir_inode_operations_dotu = {
|
|
.create = v9fs_vfs_create,
|
|
.lookup = v9fs_vfs_lookup,
|
|
.atomic_open = v9fs_vfs_atomic_open,
|
|
.symlink = v9fs_vfs_symlink,
|
|
.link = v9fs_vfs_link,
|
|
.unlink = v9fs_vfs_unlink,
|
|
.mkdir = v9fs_vfs_mkdir,
|
|
.rmdir = v9fs_vfs_rmdir,
|
|
.mknod = v9fs_vfs_mknod,
|
|
.rename = v9fs_vfs_rename,
|
|
.getattr = v9fs_vfs_getattr,
|
|
.setattr = v9fs_vfs_setattr,
|
|
};
|
|
|
|
static const struct inode_operations v9fs_dir_inode_operations = {
|
|
.create = v9fs_vfs_create,
|
|
.lookup = v9fs_vfs_lookup,
|
|
.atomic_open = v9fs_vfs_atomic_open,
|
|
.unlink = v9fs_vfs_unlink,
|
|
.mkdir = v9fs_vfs_mkdir,
|
|
.rmdir = v9fs_vfs_rmdir,
|
|
.mknod = v9fs_vfs_mknod,
|
|
.rename = v9fs_vfs_rename,
|
|
.getattr = v9fs_vfs_getattr,
|
|
.setattr = v9fs_vfs_setattr,
|
|
};
|
|
|
|
static const struct inode_operations v9fs_file_inode_operations = {
|
|
.getattr = v9fs_vfs_getattr,
|
|
.setattr = v9fs_vfs_setattr,
|
|
};
|
|
|
|
static const struct inode_operations v9fs_symlink_inode_operations = {
|
|
.get_link = v9fs_vfs_get_link,
|
|
.getattr = v9fs_vfs_getattr,
|
|
.setattr = v9fs_vfs_setattr,
|
|
};
|
|
|