/* * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. * Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved. * * This copyrighted material is made available to anyone wishing to use, * modify, copy, or redistribute it subject to the terms and conditions * of the GNU General Public License v.2. */ #include #include #include #include #include #include #include "gfs2.h" #include "dir.h" #include "glock.h" #include "glops.h" #include "inode.h" #include "ops_export.h" #include "rgrp.h" static struct dentry *gfs2_decode_fh(struct super_block *sb, __u32 *fh, int fh_len, int fh_type, int (*acceptable)(void *context, struct dentry *dentry), void *context) { struct gfs2_inum this, parent; if (fh_type != fh_len) return NULL; memset(&parent, 0, sizeof(struct gfs2_inum)); switch (fh_type) { case 8: parent.no_formal_ino = ((uint64_t)be32_to_cpu(fh[4])) << 32; parent.no_formal_ino |= be32_to_cpu(fh[5]); parent.no_addr = ((uint64_t)be32_to_cpu(fh[6])) << 32; parent.no_addr |= be32_to_cpu(fh[7]); case 4: this.no_formal_ino = ((uint64_t)be32_to_cpu(fh[0])) << 32; this.no_formal_ino |= be32_to_cpu(fh[1]); this.no_addr = ((uint64_t)be32_to_cpu(fh[2])) << 32; this.no_addr |= be32_to_cpu(fh[3]); break; default: return NULL; } return gfs2_export_ops.find_exported_dentry(sb, &this, &parent, acceptable, context); } static int gfs2_encode_fh(struct dentry *dentry, __u32 *fh, int *len, int connectable) { struct inode *inode = dentry->d_inode; struct gfs2_inode *ip = get_v2ip(inode); struct gfs2_sbd *sdp = ip->i_sbd; if (*len < 4 || (connectable && *len < 8)) return 255; fh[0] = ip->i_num.no_formal_ino >> 32; fh[0] = cpu_to_be32(fh[0]); fh[1] = ip->i_num.no_formal_ino & 0xFFFFFFFF; fh[1] = cpu_to_be32(fh[1]); fh[2] = ip->i_num.no_addr >> 32; fh[2] = cpu_to_be32(fh[2]); fh[3] = ip->i_num.no_addr & 0xFFFFFFFF; fh[3] = cpu_to_be32(fh[3]); *len = 4; if (!connectable || ip == get_v2ip(sdp->sd_root_dir)) return *len; spin_lock(&dentry->d_lock); inode = dentry->d_parent->d_inode; ip = get_v2ip(inode); gfs2_inode_hold(ip); spin_unlock(&dentry->d_lock); fh[4] = ip->i_num.no_formal_ino >> 32; fh[4] = cpu_to_be32(fh[4]); fh[5] = ip->i_num.no_formal_ino & 0xFFFFFFFF; fh[5] = cpu_to_be32(fh[5]); fh[6] = ip->i_num.no_addr >> 32; fh[6] = cpu_to_be32(fh[6]); fh[7] = ip->i_num.no_addr & 0xFFFFFFFF; fh[7] = cpu_to_be32(fh[7]); *len = 8; gfs2_inode_put(ip); return *len; } struct get_name_filldir { struct gfs2_inum inum; char *name; }; static int get_name_filldir(void *opaque, const char *name, unsigned int length, uint64_t offset, struct gfs2_inum *inum, unsigned int type) { struct get_name_filldir *gnfd = (struct get_name_filldir *)opaque; if (!gfs2_inum_equal(inum, &gnfd->inum)) return 0; memcpy(gnfd->name, name, length); gnfd->name[length] = 0; return 1; } static int gfs2_get_name(struct dentry *parent, char *name, struct dentry *child) { struct inode *dir = parent->d_inode; struct inode *inode = child->d_inode; struct gfs2_inode *dip, *ip; struct get_name_filldir gnfd; struct gfs2_holder gh; uint64_t offset = 0; int error; if (!dir) return -EINVAL; if (!S_ISDIR(dir->i_mode) || !inode) return -EINVAL; dip = get_v2ip(dir); ip = get_v2ip(inode); *name = 0; gnfd.inum = ip->i_num; gnfd.name = name; error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &gh); if (error) return error; error = gfs2_dir_read(dip, &offset, &gnfd, get_name_filldir); gfs2_glock_dq_uninit(&gh); if (!error && !*name) error = -ENOENT; return error; } static struct dentry *gfs2_get_parent(struct dentry *child) { struct gfs2_inode *dip = get_v2ip(child->d_inode); struct qstr dotdot = { .name = "..", .len = 2 }; struct inode *inode; struct dentry *dentry; int error; error = gfs2_lookupi(child->d_inode, &dotdot, 1, &inode); if (error) return ERR_PTR(error); dentry = d_alloc_anon(inode); if (!dentry) { iput(inode); return ERR_PTR(-ENOMEM); } return dentry; } static struct dentry *gfs2_get_dentry(struct super_block *sb, void *inum_p) { struct gfs2_sbd *sdp = get_v2sdp(sb); struct gfs2_inum *inum = (struct gfs2_inum *)inum_p; struct gfs2_holder i_gh, ri_gh, rgd_gh; struct gfs2_rgrpd *rgd; struct gfs2_inode *ip; struct inode *inode; struct dentry *dentry; int error; /* System files? */ inode = gfs2_iget(sb, inum); if (inode) { ip = get_v2ip(inode); if (ip->i_num.no_formal_ino != inum->no_formal_ino) { iput(inode); return ERR_PTR(-ESTALE); } goto out_inode; } error = gfs2_glock_nq_num(sdp, inum->no_addr, &gfs2_inode_glops, LM_ST_SHARED, LM_FLAG_ANY | GL_LOCAL_EXCL, &i_gh); if (error) return ERR_PTR(error); error = gfs2_inode_get(i_gh.gh_gl, inum, NO_CREATE, &ip); if (error) goto fail; if (ip) goto out_ip; error = gfs2_rindex_hold(sdp, &ri_gh); if (error) goto fail; error = -EINVAL; rgd = gfs2_blk2rgrpd(sdp, inum->no_addr); if (!rgd) goto fail_rindex; error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_SHARED, 0, &rgd_gh); if (error) goto fail_rindex; error = -ESTALE; if (gfs2_get_block_type(rgd, inum->no_addr) != GFS2_BLKST_DINODE) goto fail_rgd; gfs2_glock_dq_uninit(&rgd_gh); gfs2_glock_dq_uninit(&ri_gh); error = gfs2_inode_get(i_gh.gh_gl, inum, CREATE, &ip); if (error) goto fail; error = gfs2_inode_refresh(ip); if (error) { gfs2_inode_put(ip); goto fail; } out_ip: error = -EIO; if (ip->i_di.di_flags & GFS2_DIF_SYSTEM) { gfs2_inode_put(ip); goto fail; } gfs2_glock_dq_uninit(&i_gh); inode = gfs2_ip2v(ip); gfs2_inode_put(ip); if (!inode) return ERR_PTR(-ENOMEM); out_inode: dentry = d_alloc_anon(inode); if (!dentry) { iput(inode); return ERR_PTR(-ENOMEM); } return dentry; fail_rgd: gfs2_glock_dq_uninit(&rgd_gh); fail_rindex: gfs2_glock_dq_uninit(&ri_gh); fail: gfs2_glock_dq_uninit(&i_gh); return ERR_PTR(error); } struct export_operations gfs2_export_ops = { .decode_fh = gfs2_decode_fh, .encode_fh = gfs2_encode_fh, .get_name = gfs2_get_name, .get_parent = gfs2_get_parent, .get_dentry = gfs2_get_dentry, };