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196 lines
4.6 KiB
196 lines
4.6 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. |
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* Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. |
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*/ |
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#include <linux/spinlock.h> |
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#include <linux/completion.h> |
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#include <linux/buffer_head.h> |
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#include <linux/exportfs.h> |
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#include <linux/gfs2_ondisk.h> |
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#include <linux/crc32.h> |
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#include "gfs2.h" |
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#include "incore.h" |
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#include "dir.h" |
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#include "glock.h" |
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#include "glops.h" |
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#include "inode.h" |
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#include "super.h" |
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#include "rgrp.h" |
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#include "util.h" |
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#define GFS2_SMALL_FH_SIZE 4 |
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#define GFS2_LARGE_FH_SIZE 8 |
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#define GFS2_OLD_FH_SIZE 10 |
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static int gfs2_encode_fh(struct inode *inode, __u32 *p, int *len, |
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struct inode *parent) |
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{ |
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__be32 *fh = (__force __be32 *)p; |
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struct super_block *sb = inode->i_sb; |
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struct gfs2_inode *ip = GFS2_I(inode); |
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if (parent && (*len < GFS2_LARGE_FH_SIZE)) { |
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*len = GFS2_LARGE_FH_SIZE; |
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return FILEID_INVALID; |
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} else if (*len < GFS2_SMALL_FH_SIZE) { |
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*len = GFS2_SMALL_FH_SIZE; |
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return FILEID_INVALID; |
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} |
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fh[0] = cpu_to_be32(ip->i_no_formal_ino >> 32); |
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fh[1] = cpu_to_be32(ip->i_no_formal_ino & 0xFFFFFFFF); |
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fh[2] = cpu_to_be32(ip->i_no_addr >> 32); |
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fh[3] = cpu_to_be32(ip->i_no_addr & 0xFFFFFFFF); |
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*len = GFS2_SMALL_FH_SIZE; |
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if (!parent || inode == d_inode(sb->s_root)) |
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return *len; |
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ip = GFS2_I(parent); |
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fh[4] = cpu_to_be32(ip->i_no_formal_ino >> 32); |
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fh[5] = cpu_to_be32(ip->i_no_formal_ino & 0xFFFFFFFF); |
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fh[6] = cpu_to_be32(ip->i_no_addr >> 32); |
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fh[7] = cpu_to_be32(ip->i_no_addr & 0xFFFFFFFF); |
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*len = GFS2_LARGE_FH_SIZE; |
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return *len; |
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} |
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struct get_name_filldir { |
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struct dir_context ctx; |
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struct gfs2_inum_host inum; |
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char *name; |
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}; |
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static int get_name_filldir(struct dir_context *ctx, const char *name, |
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int length, loff_t offset, u64 inum, |
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unsigned int type) |
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{ |
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struct get_name_filldir *gnfd = |
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container_of(ctx, struct get_name_filldir, ctx); |
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if (inum != gnfd->inum.no_addr) |
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return 0; |
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memcpy(gnfd->name, name, length); |
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gnfd->name[length] = 0; |
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return 1; |
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} |
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static int gfs2_get_name(struct dentry *parent, char *name, |
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struct dentry *child) |
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{ |
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struct inode *dir = d_inode(parent); |
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struct inode *inode = d_inode(child); |
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struct gfs2_inode *dip, *ip; |
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struct get_name_filldir gnfd = { |
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.ctx.actor = get_name_filldir, |
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.name = name |
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}; |
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struct gfs2_holder gh; |
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int error; |
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struct file_ra_state f_ra = { .start = 0 }; |
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if (!dir) |
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return -EINVAL; |
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if (!S_ISDIR(dir->i_mode) || !inode) |
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return -EINVAL; |
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dip = GFS2_I(dir); |
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ip = GFS2_I(inode); |
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*name = 0; |
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gnfd.inum.no_addr = ip->i_no_addr; |
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gnfd.inum.no_formal_ino = ip->i_no_formal_ino; |
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error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &gh); |
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if (error) |
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return error; |
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error = gfs2_dir_read(dir, &gnfd.ctx, &f_ra); |
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gfs2_glock_dq_uninit(&gh); |
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if (!error && !*name) |
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error = -ENOENT; |
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return error; |
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} |
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static struct dentry *gfs2_get_parent(struct dentry *child) |
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{ |
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return d_obtain_alias(gfs2_lookupi(d_inode(child), &gfs2_qdotdot, 1)); |
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} |
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static struct dentry *gfs2_get_dentry(struct super_block *sb, |
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struct gfs2_inum_host *inum) |
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{ |
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struct gfs2_sbd *sdp = sb->s_fs_info; |
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struct inode *inode; |
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if (!inum->no_formal_ino) |
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return ERR_PTR(-ESTALE); |
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inode = gfs2_lookup_by_inum(sdp, inum->no_addr, inum->no_formal_ino, |
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GFS2_BLKST_DINODE); |
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if (IS_ERR(inode)) |
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return ERR_CAST(inode); |
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return d_obtain_alias(inode); |
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} |
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static struct dentry *gfs2_fh_to_dentry(struct super_block *sb, struct fid *fid, |
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int fh_len, int fh_type) |
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{ |
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struct gfs2_inum_host this; |
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__be32 *fh = (__force __be32 *)fid->raw; |
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switch (fh_type) { |
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case GFS2_SMALL_FH_SIZE: |
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case GFS2_LARGE_FH_SIZE: |
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case GFS2_OLD_FH_SIZE: |
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if (fh_len < GFS2_SMALL_FH_SIZE) |
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return NULL; |
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this.no_formal_ino = ((u64)be32_to_cpu(fh[0])) << 32; |
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this.no_formal_ino |= be32_to_cpu(fh[1]); |
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this.no_addr = ((u64)be32_to_cpu(fh[2])) << 32; |
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this.no_addr |= be32_to_cpu(fh[3]); |
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return gfs2_get_dentry(sb, &this); |
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default: |
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return NULL; |
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} |
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} |
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static struct dentry *gfs2_fh_to_parent(struct super_block *sb, struct fid *fid, |
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int fh_len, int fh_type) |
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{ |
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struct gfs2_inum_host parent; |
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__be32 *fh = (__force __be32 *)fid->raw; |
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switch (fh_type) { |
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case GFS2_LARGE_FH_SIZE: |
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case GFS2_OLD_FH_SIZE: |
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if (fh_len < GFS2_LARGE_FH_SIZE) |
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return NULL; |
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parent.no_formal_ino = ((u64)be32_to_cpu(fh[4])) << 32; |
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parent.no_formal_ino |= be32_to_cpu(fh[5]); |
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parent.no_addr = ((u64)be32_to_cpu(fh[6])) << 32; |
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parent.no_addr |= be32_to_cpu(fh[7]); |
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return gfs2_get_dentry(sb, &parent); |
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default: |
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return NULL; |
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} |
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} |
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const struct export_operations gfs2_export_ops = { |
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.encode_fh = gfs2_encode_fh, |
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.fh_to_dentry = gfs2_fh_to_dentry, |
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.fh_to_parent = gfs2_fh_to_parent, |
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.get_name = gfs2_get_name, |
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.get_parent = gfs2_get_parent, |
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}; |
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