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285 lines
6.2 KiB
285 lines
6.2 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* -*- mode: c; c-basic-offset: 8; -*- |
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* vim: noexpandtab sw=8 ts=8 sts=0: |
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* |
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* export.c |
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* |
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* Functions to facilitate NFS exporting |
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* |
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* Copyright (C) 2002, 2005 Oracle. All rights reserved. |
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*/ |
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#include <linux/fs.h> |
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#include <linux/types.h> |
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#include <cluster/masklog.h> |
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#include "ocfs2.h" |
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#include "alloc.h" |
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#include "dir.h" |
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#include "dlmglue.h" |
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#include "dcache.h" |
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#include "export.h" |
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#include "inode.h" |
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#include "buffer_head_io.h" |
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#include "suballoc.h" |
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#include "ocfs2_trace.h" |
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struct ocfs2_inode_handle |
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{ |
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u64 ih_blkno; |
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u32 ih_generation; |
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}; |
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static struct dentry *ocfs2_get_dentry(struct super_block *sb, |
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struct ocfs2_inode_handle *handle) |
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{ |
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struct inode *inode; |
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struct ocfs2_super *osb = OCFS2_SB(sb); |
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u64 blkno = handle->ih_blkno; |
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int status, set; |
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struct dentry *result; |
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trace_ocfs2_get_dentry_begin(sb, handle, (unsigned long long)blkno); |
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if (blkno == 0) { |
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result = ERR_PTR(-ESTALE); |
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goto bail; |
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} |
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inode = ocfs2_ilookup(sb, blkno); |
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/* |
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* If the inode exists in memory, we only need to check it's |
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* generation number |
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*/ |
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if (inode) |
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goto check_gen; |
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/* |
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* This will synchronize us against ocfs2_delete_inode() on |
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* all nodes |
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*/ |
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status = ocfs2_nfs_sync_lock(osb, 1); |
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if (status < 0) { |
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mlog(ML_ERROR, "getting nfs sync lock(EX) failed %d\n", status); |
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goto check_err; |
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} |
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status = ocfs2_test_inode_bit(osb, blkno, &set); |
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if (status < 0) { |
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if (status == -EINVAL) { |
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/* |
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* The blkno NFS gave us doesn't even show up |
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* as an inode, we return -ESTALE to be |
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* nice |
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*/ |
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status = -ESTALE; |
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} else |
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mlog(ML_ERROR, "test inode bit failed %d\n", status); |
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goto unlock_nfs_sync; |
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} |
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trace_ocfs2_get_dentry_test_bit(status, set); |
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/* If the inode allocator bit is clear, this inode must be stale */ |
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if (!set) { |
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status = -ESTALE; |
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goto unlock_nfs_sync; |
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} |
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inode = ocfs2_iget(osb, blkno, 0, 0); |
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unlock_nfs_sync: |
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ocfs2_nfs_sync_unlock(osb, 1); |
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check_err: |
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if (status < 0) { |
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if (status == -ESTALE) { |
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trace_ocfs2_get_dentry_stale((unsigned long long)blkno, |
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handle->ih_generation); |
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} |
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result = ERR_PTR(status); |
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goto bail; |
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} |
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if (IS_ERR(inode)) { |
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mlog_errno(PTR_ERR(inode)); |
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result = ERR_CAST(inode); |
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goto bail; |
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} |
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check_gen: |
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if (handle->ih_generation != inode->i_generation) { |
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trace_ocfs2_get_dentry_generation((unsigned long long)blkno, |
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handle->ih_generation, |
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inode->i_generation); |
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iput(inode); |
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result = ERR_PTR(-ESTALE); |
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goto bail; |
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} |
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result = d_obtain_alias(inode); |
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if (IS_ERR(result)) |
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mlog_errno(PTR_ERR(result)); |
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bail: |
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trace_ocfs2_get_dentry_end(result); |
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return result; |
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} |
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static struct dentry *ocfs2_get_parent(struct dentry *child) |
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{ |
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int status; |
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u64 blkno; |
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struct dentry *parent; |
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struct inode *dir = d_inode(child); |
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int set; |
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trace_ocfs2_get_parent(child, child->d_name.len, child->d_name.name, |
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(unsigned long long)OCFS2_I(dir)->ip_blkno); |
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status = ocfs2_nfs_sync_lock(OCFS2_SB(dir->i_sb), 1); |
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if (status < 0) { |
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mlog(ML_ERROR, "getting nfs sync lock(EX) failed %d\n", status); |
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parent = ERR_PTR(status); |
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goto bail; |
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} |
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status = ocfs2_inode_lock(dir, NULL, 0); |
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if (status < 0) { |
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if (status != -ENOENT) |
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mlog_errno(status); |
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parent = ERR_PTR(status); |
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goto unlock_nfs_sync; |
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} |
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status = ocfs2_lookup_ino_from_name(dir, "..", 2, &blkno); |
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if (status < 0) { |
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parent = ERR_PTR(-ENOENT); |
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goto bail_unlock; |
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} |
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status = ocfs2_test_inode_bit(OCFS2_SB(dir->i_sb), blkno, &set); |
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if (status < 0) { |
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if (status == -EINVAL) { |
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status = -ESTALE; |
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} else |
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mlog(ML_ERROR, "test inode bit failed %d\n", status); |
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parent = ERR_PTR(status); |
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goto bail_unlock; |
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} |
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trace_ocfs2_get_dentry_test_bit(status, set); |
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if (!set) { |
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status = -ESTALE; |
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parent = ERR_PTR(status); |
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goto bail_unlock; |
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} |
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parent = d_obtain_alias(ocfs2_iget(OCFS2_SB(dir->i_sb), blkno, 0, 0)); |
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bail_unlock: |
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ocfs2_inode_unlock(dir, 0); |
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unlock_nfs_sync: |
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ocfs2_nfs_sync_unlock(OCFS2_SB(dir->i_sb), 1); |
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bail: |
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trace_ocfs2_get_parent_end(parent); |
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return parent; |
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} |
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static int ocfs2_encode_fh(struct inode *inode, u32 *fh_in, int *max_len, |
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struct inode *parent) |
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{ |
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int len = *max_len; |
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int type = 1; |
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u64 blkno; |
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u32 generation; |
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__le32 *fh = (__force __le32 *) fh_in; |
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#ifdef TRACE_HOOKS_ARE_NOT_BRAINDEAD_IN_YOUR_OPINION |
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#error "You go ahead and fix that mess, then. Somehow" |
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trace_ocfs2_encode_fh_begin(dentry, dentry->d_name.len, |
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dentry->d_name.name, |
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fh, len, connectable); |
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#endif |
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if (parent && (len < 6)) { |
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*max_len = 6; |
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type = FILEID_INVALID; |
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goto bail; |
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} else if (len < 3) { |
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*max_len = 3; |
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type = FILEID_INVALID; |
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goto bail; |
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} |
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blkno = OCFS2_I(inode)->ip_blkno; |
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generation = inode->i_generation; |
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trace_ocfs2_encode_fh_self((unsigned long long)blkno, generation); |
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len = 3; |
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fh[0] = cpu_to_le32((u32)(blkno >> 32)); |
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fh[1] = cpu_to_le32((u32)(blkno & 0xffffffff)); |
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fh[2] = cpu_to_le32(generation); |
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if (parent) { |
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blkno = OCFS2_I(parent)->ip_blkno; |
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generation = parent->i_generation; |
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fh[3] = cpu_to_le32((u32)(blkno >> 32)); |
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fh[4] = cpu_to_le32((u32)(blkno & 0xffffffff)); |
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fh[5] = cpu_to_le32(generation); |
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len = 6; |
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type = 2; |
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trace_ocfs2_encode_fh_parent((unsigned long long)blkno, |
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generation); |
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} |
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*max_len = len; |
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bail: |
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trace_ocfs2_encode_fh_type(type); |
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return type; |
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} |
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static struct dentry *ocfs2_fh_to_dentry(struct super_block *sb, |
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struct fid *fid, int fh_len, int fh_type) |
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{ |
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struct ocfs2_inode_handle handle; |
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if (fh_len < 3 || fh_type > 2) |
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return NULL; |
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handle.ih_blkno = (u64)le32_to_cpu(fid->raw[0]) << 32; |
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handle.ih_blkno |= (u64)le32_to_cpu(fid->raw[1]); |
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handle.ih_generation = le32_to_cpu(fid->raw[2]); |
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return ocfs2_get_dentry(sb, &handle); |
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} |
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static struct dentry *ocfs2_fh_to_parent(struct super_block *sb, |
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struct fid *fid, int fh_len, int fh_type) |
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{ |
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struct ocfs2_inode_handle parent; |
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if (fh_type != 2 || fh_len < 6) |
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return NULL; |
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parent.ih_blkno = (u64)le32_to_cpu(fid->raw[3]) << 32; |
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parent.ih_blkno |= (u64)le32_to_cpu(fid->raw[4]); |
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parent.ih_generation = le32_to_cpu(fid->raw[5]); |
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return ocfs2_get_dentry(sb, &parent); |
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} |
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const struct export_operations ocfs2_export_ops = { |
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.encode_fh = ocfs2_encode_fh, |
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.fh_to_dentry = ocfs2_fh_to_dentry, |
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.fh_to_parent = ocfs2_fh_to_parent, |
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.get_parent = ocfs2_get_parent, |
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};
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