/* * Squashfs - a compressed read only filesystem for Linux * * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008 * Phillip Lougher * * 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, * 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, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. * * export.c */ /* * This file implements code to make Squashfs filesystems exportable (NFS etc.) * * The export code uses an inode lookup table to map inode numbers passed in * filehandles to an inode location on disk. This table is stored compressed * into metadata blocks. A second index table is used to locate these. This * second index table for speed of access (and because it is small) is read at * mount time and cached in memory. * * The inode lookup table is used only by the export code, inode disk * locations are directly encoded in directories, enabling direct access * without an intermediate lookup for all operations except the export ops. */ #include #include #include #include #include #include "squashfs_fs.h" #include "squashfs_fs_sb.h" #include "squashfs_fs_i.h" #include "squashfs.h" /* * Look-up inode number (ino) in table, returning the inode location. */ static long long squashfs_inode_lookup(struct super_block *sb, int ino_num) { struct squashfs_sb_info *msblk = sb->s_fs_info; int blk = SQUASHFS_LOOKUP_BLOCK(ino_num - 1); int offset = SQUASHFS_LOOKUP_BLOCK_OFFSET(ino_num - 1); u64 start = le64_to_cpu(msblk->inode_lookup_table[blk]); __le64 ino; int err; TRACE("Entered squashfs_inode_lookup, inode_number = %d\n", ino_num); err = squashfs_read_metadata(sb, &ino, &start, &offset, sizeof(ino)); if (err < 0) return err; TRACE("squashfs_inode_lookup, inode = 0x%llx\n", (u64) le64_to_cpu(ino)); return le64_to_cpu(ino); } static struct dentry *squashfs_export_iget(struct super_block *sb, unsigned int ino_num) { long long ino; struct dentry *dentry = ERR_PTR(-ENOENT); TRACE("Entered squashfs_export_iget\n"); ino = squashfs_inode_lookup(sb, ino_num); if (ino >= 0) dentry = d_obtain_alias(squashfs_iget(sb, ino, ino_num)); return dentry; } static struct dentry *squashfs_fh_to_dentry(struct super_block *sb, struct fid *fid, int fh_len, int fh_type) { if ((fh_type != FILEID_INO32_GEN && fh_type != FILEID_INO32_GEN_PARENT) || fh_len < 2) return NULL; return squashfs_export_iget(sb, fid->i32.ino); } static struct dentry *squashfs_fh_to_parent(struct super_block *sb, struct fid *fid, int fh_len, int fh_type) { if (fh_type != FILEID_INO32_GEN_PARENT || fh_len < 4) return NULL; return squashfs_export_iget(sb, fid->i32.parent_ino); } static struct dentry *squashfs_get_parent(struct dentry *child) { struct inode *inode = d_inode(child); unsigned int parent_ino = squashfs_i(inode)->parent; return squashfs_export_iget(inode->i_sb, parent_ino); } /* * Read uncompressed inode lookup table indexes off disk into memory */ __le64 *squashfs_read_inode_lookup_table(struct super_block *sb, u64 lookup_table_start, u64 next_table, unsigned int inodes) { unsigned int length = SQUASHFS_LOOKUP_BLOCK_BYTES(inodes); __le64 *table; TRACE("In read_inode_lookup_table, length %d\n", length); /* Sanity check values */ /* there should always be at least one inode */ if (inodes == 0) return ERR_PTR(-EINVAL); /* length bytes should not extend into the next table - this check * also traps instances where lookup_table_start is incorrectly larger * than the next table start */ if (lookup_table_start + length > next_table) return ERR_PTR(-EINVAL); table = squashfs_read_table(sb, lookup_table_start, length); /* * table[0] points to the first inode lookup table metadata block, * this should be less than lookup_table_start */ if (!IS_ERR(table) && le64_to_cpu(table[0]) >= lookup_table_start) { kfree(table); return ERR_PTR(-EINVAL); } return table; } const struct export_operations squashfs_export_ops = { .fh_to_dentry = squashfs_fh_to_dentry, .fh_to_parent = squashfs_fh_to_parent, .get_parent = squashfs_get_parent }; nly
authorBjorn Helgaas <bhelgaas@google.com>2016-12-28 14:55:16 -0600
committerBjorn Helgaas <bhelgaas@google.com>2017-01-11 09:11:15 -0600
commit89e9f7bcd8744ea25fcf0ac671b8d72c10d7d790 (patch)
treee941c52704b59bc7d5ffe0bbaa2d42b8fec8976a /net/ncsi/ncsi-manage.c
parenta782b5f986c3fa1cfa7f2b57941200c6a5809242 (diff)
x86/PCI: Ignore _CRS on Supermicro X8DTH-i/6/iF/6F
Martin reported that the Supermicro X8DTH-i/6/iF/6F advertises incorrect host bridge windows via _CRS: pci_root PNP0A08:00: host bridge window [io 0xf000-0xffff] pci_root PNP0A08:01: host bridge window [io 0xf000-0xffff] Both bridges advertise the 0xf000-0xffff window, which cannot be correct. Work around this by ignoring _CRS on this system. The downside is that we may not assign resources correctly to hot-added PCI devices (if they are possible on this system). Link: https://bugzilla.kernel.org/show_bug.cgi?id=42606 Reported-by: Martin Burnicki <martin.burnicki@meinberg.de> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> CC: stable@vger.kernel.org
Diffstat (limited to 'net/ncsi/ncsi-manage.c')