^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <linux/spinlock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/completion.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/buffer_head.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/exportfs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/gfs2_ondisk.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/crc32.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include "gfs2.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include "incore.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include "dir.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include "glock.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include "glops.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include "inode.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include "super.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include "rgrp.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include "util.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #define GFS2_SMALL_FH_SIZE 4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #define GFS2_LARGE_FH_SIZE 8
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #define GFS2_OLD_FH_SIZE 10
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) static int gfs2_encode_fh(struct inode *inode, __u32 *p, int *len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) struct inode *parent)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) __be32 *fh = (__force __be32 *)p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) struct super_block *sb = inode->i_sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) struct gfs2_inode *ip = GFS2_I(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) if (parent && (*len < GFS2_LARGE_FH_SIZE)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) *len = GFS2_LARGE_FH_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) return FILEID_INVALID;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) } else if (*len < GFS2_SMALL_FH_SIZE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) *len = GFS2_SMALL_FH_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) return FILEID_INVALID;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) fh[0] = cpu_to_be32(ip->i_no_formal_ino >> 32);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) fh[1] = cpu_to_be32(ip->i_no_formal_ino & 0xFFFFFFFF);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) fh[2] = cpu_to_be32(ip->i_no_addr >> 32);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) fh[3] = cpu_to_be32(ip->i_no_addr & 0xFFFFFFFF);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) *len = GFS2_SMALL_FH_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) if (!parent || inode == d_inode(sb->s_root))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) return *len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) ip = GFS2_I(parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) fh[4] = cpu_to_be32(ip->i_no_formal_ino >> 32);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) fh[5] = cpu_to_be32(ip->i_no_formal_ino & 0xFFFFFFFF);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) fh[6] = cpu_to_be32(ip->i_no_addr >> 32);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) fh[7] = cpu_to_be32(ip->i_no_addr & 0xFFFFFFFF);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) *len = GFS2_LARGE_FH_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) return *len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) struct get_name_filldir {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) struct dir_context ctx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) struct gfs2_inum_host inum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) char *name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) static int get_name_filldir(struct dir_context *ctx, const char *name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) int length, loff_t offset, u64 inum,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) unsigned int type)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) struct get_name_filldir *gnfd =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) container_of(ctx, struct get_name_filldir, ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) if (inum != gnfd->inum.no_addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) memcpy(gnfd->name, name, length);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) gnfd->name[length] = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) static int gfs2_get_name(struct dentry *parent, char *name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) struct dentry *child)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) struct inode *dir = d_inode(parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) struct inode *inode = d_inode(child);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) struct gfs2_inode *dip, *ip;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) struct get_name_filldir gnfd = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) .ctx.actor = get_name_filldir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) .name = name
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) struct gfs2_holder gh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) int error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) struct file_ra_state f_ra = { .start = 0 };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) if (!dir)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) if (!S_ISDIR(dir->i_mode) || !inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) dip = GFS2_I(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) ip = GFS2_I(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) *name = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) gnfd.inum.no_addr = ip->i_no_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) gnfd.inum.no_formal_ino = ip->i_no_formal_ino;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &gh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) error = gfs2_dir_read(dir, &gnfd.ctx, &f_ra);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) gfs2_glock_dq_uninit(&gh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) if (!error && !*name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) error = -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) static struct dentry *gfs2_get_parent(struct dentry *child)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) return d_obtain_alias(gfs2_lookupi(d_inode(child), &gfs2_qdotdot, 1));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) static struct dentry *gfs2_get_dentry(struct super_block *sb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) struct gfs2_inum_host *inum)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) struct gfs2_sbd *sdp = sb->s_fs_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) struct inode *inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) if (!inum->no_formal_ino)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) return ERR_PTR(-ESTALE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) inode = gfs2_lookup_by_inum(sdp, inum->no_addr, inum->no_formal_ino,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) GFS2_BLKST_DINODE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) if (IS_ERR(inode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) return ERR_CAST(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) return d_obtain_alias(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) static struct dentry *gfs2_fh_to_dentry(struct super_block *sb, struct fid *fid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) int fh_len, int fh_type)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) struct gfs2_inum_host this;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) __be32 *fh = (__force __be32 *)fid->raw;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) switch (fh_type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) case GFS2_SMALL_FH_SIZE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) case GFS2_LARGE_FH_SIZE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) case GFS2_OLD_FH_SIZE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) if (fh_len < GFS2_SMALL_FH_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) this.no_formal_ino = ((u64)be32_to_cpu(fh[0])) << 32;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) this.no_formal_ino |= be32_to_cpu(fh[1]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) this.no_addr = ((u64)be32_to_cpu(fh[2])) << 32;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) this.no_addr |= be32_to_cpu(fh[3]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) return gfs2_get_dentry(sb, &this);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) static struct dentry *gfs2_fh_to_parent(struct super_block *sb, struct fid *fid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) int fh_len, int fh_type)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) struct gfs2_inum_host parent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) __be32 *fh = (__force __be32 *)fid->raw;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) switch (fh_type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) case GFS2_LARGE_FH_SIZE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) case GFS2_OLD_FH_SIZE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) if (fh_len < GFS2_LARGE_FH_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) parent.no_formal_ino = ((u64)be32_to_cpu(fh[4])) << 32;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) parent.no_formal_ino |= be32_to_cpu(fh[5]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) parent.no_addr = ((u64)be32_to_cpu(fh[6])) << 32;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) parent.no_addr |= be32_to_cpu(fh[7]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) return gfs2_get_dentry(sb, &parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) const struct export_operations gfs2_export_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) .encode_fh = gfs2_encode_fh,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) .fh_to_dentry = gfs2_fh_to_dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) .fh_to_parent = gfs2_fh_to_parent,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) .get_name = gfs2_get_name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) .get_parent = gfs2_get_parent,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196)
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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