From 76cb841cb886eef6b3bee341a2266c76578724ad Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Mon, 6 May 2024 03:02:30 +0200 Subject: Adding upstream version 4.19.249. Signed-off-by: Daniel Baumann --- fs/ocfs2/export.c | 299 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 299 insertions(+) create mode 100644 fs/ocfs2/export.c (limited to 'fs/ocfs2/export.c') diff --git a/fs/ocfs2/export.c b/fs/ocfs2/export.c new file mode 100644 index 000000000..af2888d23 --- /dev/null +++ b/fs/ocfs2/export.c @@ -0,0 +1,299 @@ +/* -*- mode: c; c-basic-offset: 8; -*- + * vim: noexpandtab sw=8 ts=8 sts=0: + * + * export.c + * + * Functions to facilitate NFS exporting + * + * Copyright (C) 2002, 2005 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#include +#include + +#include + +#include "ocfs2.h" + +#include "alloc.h" +#include "dir.h" +#include "dlmglue.h" +#include "dcache.h" +#include "export.h" +#include "inode.h" + +#include "buffer_head_io.h" +#include "suballoc.h" +#include "ocfs2_trace.h" + +struct ocfs2_inode_handle +{ + u64 ih_blkno; + u32 ih_generation; +}; + +static struct dentry *ocfs2_get_dentry(struct super_block *sb, + struct ocfs2_inode_handle *handle) +{ + struct inode *inode; + struct ocfs2_super *osb = OCFS2_SB(sb); + u64 blkno = handle->ih_blkno; + int status, set; + struct dentry *result; + + trace_ocfs2_get_dentry_begin(sb, handle, (unsigned long long)blkno); + + if (blkno == 0) { + result = ERR_PTR(-ESTALE); + goto bail; + } + + inode = ocfs2_ilookup(sb, blkno); + /* + * If the inode exists in memory, we only need to check it's + * generation number + */ + if (inode) + goto check_gen; + + /* + * This will synchronize us against ocfs2_delete_inode() on + * all nodes + */ + status = ocfs2_nfs_sync_lock(osb, 1); + if (status < 0) { + mlog(ML_ERROR, "getting nfs sync lock(EX) failed %d\n", status); + goto check_err; + } + + status = ocfs2_test_inode_bit(osb, blkno, &set); + if (status < 0) { + if (status == -EINVAL) { + /* + * The blkno NFS gave us doesn't even show up + * as an inode, we return -ESTALE to be + * nice + */ + status = -ESTALE; + } else + mlog(ML_ERROR, "test inode bit failed %d\n", status); + goto unlock_nfs_sync; + } + + trace_ocfs2_get_dentry_test_bit(status, set); + /* If the inode allocator bit is clear, this inode must be stale */ + if (!set) { + status = -ESTALE; + goto unlock_nfs_sync; + } + + inode = ocfs2_iget(osb, blkno, 0, 0); + +unlock_nfs_sync: + ocfs2_nfs_sync_unlock(osb, 1); + +check_err: + if (status < 0) { + if (status == -ESTALE) { + trace_ocfs2_get_dentry_stale((unsigned long long)blkno, + handle->ih_generation); + } + result = ERR_PTR(status); + goto bail; + } + + if (IS_ERR(inode)) { + mlog_errno(PTR_ERR(inode)); + result = ERR_CAST(inode); + goto bail; + } + +check_gen: + if (handle->ih_generation != inode->i_generation) { + trace_ocfs2_get_dentry_generation((unsigned long long)blkno, + handle->ih_generation, + inode->i_generation); + iput(inode); + result = ERR_PTR(-ESTALE); + goto bail; + } + + result = d_obtain_alias(inode); + if (IS_ERR(result)) + mlog_errno(PTR_ERR(result)); + +bail: + trace_ocfs2_get_dentry_end(result); + return result; +} + +static struct dentry *ocfs2_get_parent(struct dentry *child) +{ + int status; + u64 blkno; + struct dentry *parent; + struct inode *dir = d_inode(child); + int set; + + trace_ocfs2_get_parent(child, child->d_name.len, child->d_name.name, + (unsigned long long)OCFS2_I(dir)->ip_blkno); + + status = ocfs2_nfs_sync_lock(OCFS2_SB(dir->i_sb), 1); + if (status < 0) { + mlog(ML_ERROR, "getting nfs sync lock(EX) failed %d\n", status); + parent = ERR_PTR(status); + goto bail; + } + + status = ocfs2_inode_lock(dir, NULL, 0); + if (status < 0) { + if (status != -ENOENT) + mlog_errno(status); + parent = ERR_PTR(status); + goto unlock_nfs_sync; + } + + status = ocfs2_lookup_ino_from_name(dir, "..", 2, &blkno); + if (status < 0) { + parent = ERR_PTR(-ENOENT); + goto bail_unlock; + } + + status = ocfs2_test_inode_bit(OCFS2_SB(dir->i_sb), blkno, &set); + if (status < 0) { + if (status == -EINVAL) { + status = -ESTALE; + } else + mlog(ML_ERROR, "test inode bit failed %d\n", status); + parent = ERR_PTR(status); + goto bail_unlock; + } + + trace_ocfs2_get_dentry_test_bit(status, set); + if (!set) { + status = -ESTALE; + parent = ERR_PTR(status); + goto bail_unlock; + } + + parent = d_obtain_alias(ocfs2_iget(OCFS2_SB(dir->i_sb), blkno, 0, 0)); + +bail_unlock: + ocfs2_inode_unlock(dir, 0); + +unlock_nfs_sync: + ocfs2_nfs_sync_unlock(OCFS2_SB(dir->i_sb), 1); + +bail: + trace_ocfs2_get_parent_end(parent); + + return parent; +} + +static int ocfs2_encode_fh(struct inode *inode, u32 *fh_in, int *max_len, + struct inode *parent) +{ + int len = *max_len; + int type = 1; + u64 blkno; + u32 generation; + __le32 *fh = (__force __le32 *) fh_in; + +#ifdef TRACE_HOOKS_ARE_NOT_BRAINDEAD_IN_YOUR_OPINION +#error "You go ahead and fix that mess, then. Somehow" + trace_ocfs2_encode_fh_begin(dentry, dentry->d_name.len, + dentry->d_name.name, + fh, len, connectable); +#endif + + if (parent && (len < 6)) { + *max_len = 6; + type = FILEID_INVALID; + goto bail; + } else if (len < 3) { + *max_len = 3; + type = FILEID_INVALID; + goto bail; + } + + blkno = OCFS2_I(inode)->ip_blkno; + generation = inode->i_generation; + + trace_ocfs2_encode_fh_self((unsigned long long)blkno, generation); + + len = 3; + fh[0] = cpu_to_le32((u32)(blkno >> 32)); + fh[1] = cpu_to_le32((u32)(blkno & 0xffffffff)); + fh[2] = cpu_to_le32(generation); + + if (parent) { + blkno = OCFS2_I(parent)->ip_blkno; + generation = parent->i_generation; + + fh[3] = cpu_to_le32((u32)(blkno >> 32)); + fh[4] = cpu_to_le32((u32)(blkno & 0xffffffff)); + fh[5] = cpu_to_le32(generation); + + len = 6; + type = 2; + + trace_ocfs2_encode_fh_parent((unsigned long long)blkno, + generation); + } + + *max_len = len; + +bail: + trace_ocfs2_encode_fh_type(type); + return type; +} + +static struct dentry *ocfs2_fh_to_dentry(struct super_block *sb, + struct fid *fid, int fh_len, int fh_type) +{ + struct ocfs2_inode_handle handle; + + if (fh_len < 3 || fh_type > 2) + return NULL; + + handle.ih_blkno = (u64)le32_to_cpu(fid->raw[0]) << 32; + handle.ih_blkno |= (u64)le32_to_cpu(fid->raw[1]); + handle.ih_generation = le32_to_cpu(fid->raw[2]); + return ocfs2_get_dentry(sb, &handle); +} + +static struct dentry *ocfs2_fh_to_parent(struct super_block *sb, + struct fid *fid, int fh_len, int fh_type) +{ + struct ocfs2_inode_handle parent; + + if (fh_type != 2 || fh_len < 6) + return NULL; + + parent.ih_blkno = (u64)le32_to_cpu(fid->raw[3]) << 32; + parent.ih_blkno |= (u64)le32_to_cpu(fid->raw[4]); + parent.ih_generation = le32_to_cpu(fid->raw[5]); + return ocfs2_get_dentry(sb, &parent); +} + +const struct export_operations ocfs2_export_ops = { + .encode_fh = ocfs2_encode_fh, + .fh_to_dentry = ocfs2_fh_to_dentry, + .fh_to_parent = ocfs2_fh_to_parent, + .get_parent = ocfs2_get_parent, +}; -- cgit v1.2.3