2005-04-16 22:20:36 +00:00
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/*
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* super.c
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*
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* Copyright (c) 1999 Al Smith
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*
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* Portions derived from work (c) 1995,1996 Christian Vogelgsang.
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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2007-07-17 11:04:28 +00:00
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#include <linux/exportfs.h>
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2005-04-16 22:20:36 +00:00
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#include <linux/slab.h>
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#include <linux/buffer_head.h>
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#include <linux/vfs.h>
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2008-02-23 23:23:51 +00:00
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#include "efs.h"
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#include <linux/efs_vh.h>
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#include <linux/efs_fs_sb.h>
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2006-06-23 09:02:58 +00:00
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static int efs_statfs(struct dentry *dentry, struct kstatfs *buf);
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2005-04-16 22:20:36 +00:00
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static int efs_fill_super(struct super_block *s, void *d, int silent);
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2010-07-24 20:46:55 +00:00
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static struct dentry *efs_mount(struct file_system_type *fs_type,
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int flags, const char *dev_name, void *data)
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2005-04-16 22:20:36 +00:00
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{
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2010-07-24 20:46:55 +00:00
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return mount_bdev(fs_type, flags, dev_name, data, efs_fill_super);
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2005-04-16 22:20:36 +00:00
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}
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2013-12-10 22:05:05 +00:00
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static void efs_kill_sb(struct super_block *s)
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{
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struct efs_sb_info *sbi = SUPER_INFO(s);
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kill_block_super(s);
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kfree(sbi);
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}
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2005-04-16 22:20:36 +00:00
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static struct file_system_type efs_fs_type = {
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.owner = THIS_MODULE,
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.name = "efs",
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2010-07-24 20:46:55 +00:00
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.mount = efs_mount,
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2013-12-10 22:05:05 +00:00
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.kill_sb = efs_kill_sb,
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2005-04-16 22:20:36 +00:00
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.fs_flags = FS_REQUIRES_DEV,
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};
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2013-03-03 03:39:14 +00:00
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MODULE_ALIAS_FS("efs");
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2005-04-16 22:20:36 +00:00
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static struct pt_types sgi_pt_types[] = {
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{0x00, "SGI vh"},
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{0x01, "SGI trkrepl"},
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{0x02, "SGI secrepl"},
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{0x03, "SGI raw"},
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{0x04, "SGI bsd"},
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{SGI_SYSV, "SGI sysv"},
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{0x06, "SGI vol"},
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{SGI_EFS, "SGI efs"},
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{0x08, "SGI lv"},
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{0x09, "SGI rlv"},
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{0x0A, "SGI xfs"},
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{0x0B, "SGI xfslog"},
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{0x0C, "SGI xlv"},
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{0x82, "Linux swap"},
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{0x83, "Linux native"},
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{0, NULL}
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};
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2006-12-07 04:33:20 +00:00
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static struct kmem_cache * efs_inode_cachep;
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2005-04-16 22:20:36 +00:00
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static struct inode *efs_alloc_inode(struct super_block *sb)
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{
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struct efs_inode_info *ei;
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2006-12-07 04:33:17 +00:00
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ei = (struct efs_inode_info *)kmem_cache_alloc(efs_inode_cachep, GFP_KERNEL);
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2005-04-16 22:20:36 +00:00
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if (!ei)
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return NULL;
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return &ei->vfs_inode;
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}
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2011-01-07 06:49:49 +00:00
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static void efs_i_callback(struct rcu_head *head)
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2005-04-16 22:20:36 +00:00
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{
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2011-01-07 06:49:49 +00:00
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struct inode *inode = container_of(head, struct inode, i_rcu);
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2005-04-16 22:20:36 +00:00
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kmem_cache_free(efs_inode_cachep, INODE_INFO(inode));
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}
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2011-01-07 06:49:49 +00:00
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static void efs_destroy_inode(struct inode *inode)
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{
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call_rcu(&inode->i_rcu, efs_i_callback);
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}
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2008-07-26 02:45:34 +00:00
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static void init_once(void *foo)
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2005-04-16 22:20:36 +00:00
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{
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struct efs_inode_info *ei = (struct efs_inode_info *) foo;
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2007-05-17 05:10:57 +00:00
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inode_init_once(&ei->vfs_inode);
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2005-04-16 22:20:36 +00:00
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}
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2007-07-20 01:11:58 +00:00
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2005-04-16 22:20:36 +00:00
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static int init_inodecache(void)
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{
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efs_inode_cachep = kmem_cache_create("efs_inode_cache",
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sizeof(struct efs_inode_info),
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[PATCH] cpuset memory spread: slab cache filesystems
Mark file system inode and similar slab caches subject to SLAB_MEM_SPREAD
memory spreading.
If a slab cache is marked SLAB_MEM_SPREAD, then anytime that a task that's
in a cpuset with the 'memory_spread_slab' option enabled goes to allocate
from such a slab cache, the allocations are spread evenly over all the
memory nodes (task->mems_allowed) allowed to that task, instead of favoring
allocation on the node local to the current cpu.
The following inode and similar caches are marked SLAB_MEM_SPREAD:
file cache
==== =====
fs/adfs/super.c adfs_inode_cache
fs/affs/super.c affs_inode_cache
fs/befs/linuxvfs.c befs_inode_cache
fs/bfs/inode.c bfs_inode_cache
fs/block_dev.c bdev_cache
fs/cifs/cifsfs.c cifs_inode_cache
fs/coda/inode.c coda_inode_cache
fs/dquot.c dquot
fs/efs/super.c efs_inode_cache
fs/ext2/super.c ext2_inode_cache
fs/ext2/xattr.c (fs/mbcache.c) ext2_xattr
fs/ext3/super.c ext3_inode_cache
fs/ext3/xattr.c (fs/mbcache.c) ext3_xattr
fs/fat/cache.c fat_cache
fs/fat/inode.c fat_inode_cache
fs/freevxfs/vxfs_super.c vxfs_inode
fs/hpfs/super.c hpfs_inode_cache
fs/isofs/inode.c isofs_inode_cache
fs/jffs/inode-v23.c jffs_fm
fs/jffs2/super.c jffs2_i
fs/jfs/super.c jfs_ip
fs/minix/inode.c minix_inode_cache
fs/ncpfs/inode.c ncp_inode_cache
fs/nfs/direct.c nfs_direct_cache
fs/nfs/inode.c nfs_inode_cache
fs/ntfs/super.c ntfs_big_inode_cache_name
fs/ntfs/super.c ntfs_inode_cache
fs/ocfs2/dlm/dlmfs.c dlmfs_inode_cache
fs/ocfs2/super.c ocfs2_inode_cache
fs/proc/inode.c proc_inode_cache
fs/qnx4/inode.c qnx4_inode_cache
fs/reiserfs/super.c reiser_inode_cache
fs/romfs/inode.c romfs_inode_cache
fs/smbfs/inode.c smb_inode_cache
fs/sysv/inode.c sysv_inode_cache
fs/udf/super.c udf_inode_cache
fs/ufs/super.c ufs_inode_cache
net/socket.c sock_inode_cache
net/sunrpc/rpc_pipe.c rpc_inode_cache
The choice of which slab caches to so mark was quite simple. I marked
those already marked SLAB_RECLAIM_ACCOUNT, except for fs/xfs, dentry_cache,
inode_cache, and buffer_head, which were marked in a previous patch. Even
though SLAB_RECLAIM_ACCOUNT is for a different purpose, it marks the same
potentially large file system i/o related slab caches as we need for memory
spreading.
Given that the rule now becomes "wherever you would have used a
SLAB_RECLAIM_ACCOUNT slab cache flag before (usually the inode cache), use
the SLAB_MEM_SPREAD flag too", this should be easy enough to maintain.
Future file system writers will just copy one of the existing file system
slab cache setups and tend to get it right without thinking.
Signed-off-by: Paul Jackson <pj@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-03-24 11:16:05 +00:00
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0, SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
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2007-07-20 01:11:58 +00:00
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init_once);
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2005-04-16 22:20:36 +00:00
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if (efs_inode_cachep == NULL)
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return -ENOMEM;
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return 0;
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}
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static void destroy_inodecache(void)
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{
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2012-09-26 01:33:07 +00:00
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/*
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* Make sure all delayed rcu free inodes are flushed before we
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* destroy cache.
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*/
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rcu_barrier();
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2006-09-27 08:49:40 +00:00
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kmem_cache_destroy(efs_inode_cachep);
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2005-04-16 22:20:36 +00:00
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}
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static int efs_remount(struct super_block *sb, int *flags, char *data)
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{
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*flags |= MS_RDONLY;
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return 0;
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}
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2007-02-12 08:55:41 +00:00
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static const struct super_operations efs_superblock_operations = {
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2005-04-16 22:20:36 +00:00
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.alloc_inode = efs_alloc_inode,
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.destroy_inode = efs_destroy_inode,
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.statfs = efs_statfs,
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.remount_fs = efs_remount,
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};
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2007-10-21 23:42:17 +00:00
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static const struct export_operations efs_export_ops = {
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2007-10-21 23:42:09 +00:00
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.fh_to_dentry = efs_fh_to_dentry,
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.fh_to_parent = efs_fh_to_parent,
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2005-04-16 22:20:36 +00:00
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.get_parent = efs_get_parent,
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};
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static int __init init_efs_fs(void) {
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int err;
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printk("EFS: "EFS_VERSION" - http://aeschi.ch.eu.org/efs/\n");
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err = init_inodecache();
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if (err)
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goto out1;
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err = register_filesystem(&efs_fs_type);
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if (err)
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goto out;
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return 0;
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out:
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destroy_inodecache();
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out1:
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return err;
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}
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static void __exit exit_efs_fs(void) {
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unregister_filesystem(&efs_fs_type);
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destroy_inodecache();
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}
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module_init(init_efs_fs)
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module_exit(exit_efs_fs)
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static efs_block_t efs_validate_vh(struct volume_header *vh) {
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int i;
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__be32 cs, *ui;
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int csum;
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efs_block_t sblock = 0; /* shuts up gcc */
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struct pt_types *pt_entry;
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int pt_type, slice = -1;
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if (be32_to_cpu(vh->vh_magic) != VHMAGIC) {
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/*
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* assume that we're dealing with a partition and allow
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* read_super() to try and detect a valid superblock
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* on the next block.
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*/
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return 0;
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}
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ui = ((__be32 *) (vh + 1)) - 1;
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for(csum = 0; ui >= ((__be32 *) vh);) {
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cs = *ui--;
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csum += be32_to_cpu(cs);
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}
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if (csum) {
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printk(KERN_INFO "EFS: SGI disklabel: checksum bad, label corrupted\n");
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return 0;
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}
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#ifdef DEBUG
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printk(KERN_DEBUG "EFS: bf: \"%16s\"\n", vh->vh_bootfile);
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for(i = 0; i < NVDIR; i++) {
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int j;
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char name[VDNAMESIZE+1];
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for(j = 0; j < VDNAMESIZE; j++) {
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name[j] = vh->vh_vd[i].vd_name[j];
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}
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name[j] = (char) 0;
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if (name[0]) {
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printk(KERN_DEBUG "EFS: vh: %8s block: 0x%08x size: 0x%08x\n",
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name,
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(int) be32_to_cpu(vh->vh_vd[i].vd_lbn),
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(int) be32_to_cpu(vh->vh_vd[i].vd_nbytes));
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}
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}
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#endif
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for(i = 0; i < NPARTAB; i++) {
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pt_type = (int) be32_to_cpu(vh->vh_pt[i].pt_type);
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for(pt_entry = sgi_pt_types; pt_entry->pt_name; pt_entry++) {
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if (pt_type == pt_entry->pt_type) break;
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}
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#ifdef DEBUG
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if (be32_to_cpu(vh->vh_pt[i].pt_nblks)) {
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printk(KERN_DEBUG "EFS: pt %2d: start: %08d size: %08d type: 0x%02x (%s)\n",
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i,
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(int) be32_to_cpu(vh->vh_pt[i].pt_firstlbn),
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(int) be32_to_cpu(vh->vh_pt[i].pt_nblks),
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pt_type,
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(pt_entry->pt_name) ? pt_entry->pt_name : "unknown");
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}
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#endif
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if (IS_EFS(pt_type)) {
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sblock = be32_to_cpu(vh->vh_pt[i].pt_firstlbn);
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slice = i;
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}
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}
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if (slice == -1) {
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printk(KERN_NOTICE "EFS: partition table contained no EFS partitions\n");
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#ifdef DEBUG
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} else {
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printk(KERN_INFO "EFS: using slice %d (type %s, offset 0x%x)\n",
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slice,
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(pt_entry->pt_name) ? pt_entry->pt_name : "unknown",
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sblock);
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#endif
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}
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2006-01-15 01:37:08 +00:00
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return sblock;
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2005-04-16 22:20:36 +00:00
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}
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static int efs_validate_super(struct efs_sb_info *sb, struct efs_super *super) {
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2006-01-15 01:37:08 +00:00
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if (!IS_EFS_MAGIC(be32_to_cpu(super->fs_magic)))
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return -1;
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2005-04-16 22:20:36 +00:00
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sb->fs_magic = be32_to_cpu(super->fs_magic);
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sb->total_blocks = be32_to_cpu(super->fs_size);
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sb->first_block = be32_to_cpu(super->fs_firstcg);
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sb->group_size = be32_to_cpu(super->fs_cgfsize);
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sb->data_free = be32_to_cpu(super->fs_tfree);
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sb->inode_free = be32_to_cpu(super->fs_tinode);
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sb->inode_blocks = be16_to_cpu(super->fs_cgisize);
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sb->total_groups = be16_to_cpu(super->fs_ncg);
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return 0;
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}
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static int efs_fill_super(struct super_block *s, void *d, int silent)
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{
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struct efs_sb_info *sb;
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struct buffer_head *bh;
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struct inode *root;
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2006-09-27 08:49:37 +00:00
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sb = kzalloc(sizeof(struct efs_sb_info), GFP_KERNEL);
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2005-04-16 22:20:36 +00:00
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if (!sb)
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return -ENOMEM;
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s->s_fs_info = sb;
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s->s_magic = EFS_SUPER_MAGIC;
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if (!sb_set_blocksize(s, EFS_BLOCKSIZE)) {
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printk(KERN_ERR "EFS: device does not support %d byte blocks\n",
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EFS_BLOCKSIZE);
|
2013-12-10 22:05:05 +00:00
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return -EINVAL;
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2005-04-16 22:20:36 +00:00
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}
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/* read the vh (volume header) block */
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bh = sb_bread(s, 0);
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if (!bh) {
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printk(KERN_ERR "EFS: cannot read volume header\n");
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2013-12-10 22:05:05 +00:00
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return -EINVAL;
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2005-04-16 22:20:36 +00:00
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}
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|
|
|
|
|
/*
|
|
|
|
* if this returns zero then we didn't find any partition table.
|
|
|
|
* this isn't (yet) an error - just assume for the moment that
|
|
|
|
* the device is valid and go on to search for a superblock.
|
|
|
|
*/
|
|
|
|
sb->fs_start = efs_validate_vh((struct volume_header *) bh->b_data);
|
|
|
|
brelse(bh);
|
|
|
|
|
|
|
|
if (sb->fs_start == -1) {
|
2013-12-10 22:05:05 +00:00
|
|
|
return -EINVAL;
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
bh = sb_bread(s, sb->fs_start + EFS_SUPER);
|
|
|
|
if (!bh) {
|
|
|
|
printk(KERN_ERR "EFS: cannot read superblock\n");
|
2013-12-10 22:05:05 +00:00
|
|
|
return -EINVAL;
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
if (efs_validate_super(sb, (struct efs_super *) bh->b_data)) {
|
|
|
|
#ifdef DEBUG
|
|
|
|
printk(KERN_WARNING "EFS: invalid superblock at block %u\n", sb->fs_start + EFS_SUPER);
|
|
|
|
#endif
|
|
|
|
brelse(bh);
|
2013-12-10 22:05:05 +00:00
|
|
|
return -EINVAL;
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
brelse(bh);
|
|
|
|
|
|
|
|
if (!(s->s_flags & MS_RDONLY)) {
|
|
|
|
#ifdef DEBUG
|
|
|
|
printk(KERN_INFO "EFS: forcing read-only mode\n");
|
|
|
|
#endif
|
|
|
|
s->s_flags |= MS_RDONLY;
|
|
|
|
}
|
|
|
|
s->s_op = &efs_superblock_operations;
|
|
|
|
s->s_export_op = &efs_export_ops;
|
2008-02-07 08:15:34 +00:00
|
|
|
root = efs_iget(s, EFS_ROOTINODE);
|
|
|
|
if (IS_ERR(root)) {
|
|
|
|
printk(KERN_ERR "EFS: get root inode failed\n");
|
2013-12-10 22:05:05 +00:00
|
|
|
return PTR_ERR(root);
|
2008-02-07 08:15:34 +00:00
|
|
|
}
|
|
|
|
|
2012-01-09 03:15:13 +00:00
|
|
|
s->s_root = d_make_root(root);
|
2005-04-16 22:20:36 +00:00
|
|
|
if (!(s->s_root)) {
|
2008-02-07 08:15:34 +00:00
|
|
|
printk(KERN_ERR "EFS: get root dentry failed\n");
|
2013-12-10 22:05:05 +00:00
|
|
|
return -ENOMEM;
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2006-06-23 09:02:58 +00:00
|
|
|
static int efs_statfs(struct dentry *dentry, struct kstatfs *buf) {
|
2009-04-02 23:59:34 +00:00
|
|
|
struct super_block *sb = dentry->d_sb;
|
|
|
|
struct efs_sb_info *sbi = SUPER_INFO(sb);
|
|
|
|
u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
buf->f_type = EFS_SUPER_MAGIC; /* efs magic number */
|
|
|
|
buf->f_bsize = EFS_BLOCKSIZE; /* blocksize */
|
2009-04-02 23:59:34 +00:00
|
|
|
buf->f_blocks = sbi->total_groups * /* total data blocks */
|
|
|
|
(sbi->group_size - sbi->inode_blocks);
|
|
|
|
buf->f_bfree = sbi->data_free; /* free data blocks */
|
|
|
|
buf->f_bavail = sbi->data_free; /* free blocks for non-root */
|
|
|
|
buf->f_files = sbi->total_groups * /* total inodes */
|
|
|
|
sbi->inode_blocks *
|
2005-04-16 22:20:36 +00:00
|
|
|
(EFS_BLOCKSIZE / sizeof(struct efs_dinode));
|
2009-04-02 23:59:34 +00:00
|
|
|
buf->f_ffree = sbi->inode_free; /* free inodes */
|
|
|
|
buf->f_fsid.val[0] = (u32)id;
|
|
|
|
buf->f_fsid.val[1] = (u32)(id >> 32);
|
2005-04-16 22:20:36 +00:00
|
|
|
buf->f_namelen = EFS_MAXNAMELEN; /* max filename length */
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|