David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. |
Steven Whitehouse | 3a8a9a1 | 2006-05-18 15:09:15 -0400 | [diff] [blame] | 3 | * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 4 | * |
| 5 | * This copyrighted material is made available to anyone wishing to use, |
| 6 | * modify, copy, or redistribute it subject to the terms and conditions |
Steven Whitehouse | e9fc2aa | 2006-09-01 11:05:15 -0400 | [diff] [blame^] | 7 | * of the GNU General Public License version 2. |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 8 | */ |
| 9 | |
| 10 | #include <linux/sched.h> |
| 11 | #include <linux/slab.h> |
| 12 | #include <linux/spinlock.h> |
| 13 | #include <linux/completion.h> |
| 14 | #include <linux/buffer_head.h> |
| 15 | #include <linux/smp_lock.h> |
Steven Whitehouse | 5c676f6 | 2006-02-27 17:23:27 -0500 | [diff] [blame] | 16 | #include <linux/gfs2_ondisk.h> |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 17 | #include <linux/crc32.h> |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 18 | |
| 19 | #include "gfs2.h" |
Steven Whitehouse | 5c676f6 | 2006-02-27 17:23:27 -0500 | [diff] [blame] | 20 | #include "lm_interface.h" |
| 21 | #include "incore.h" |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 22 | #include "dir.h" |
| 23 | #include "glock.h" |
| 24 | #include "ops_dentry.h" |
Steven Whitehouse | 5c676f6 | 2006-02-27 17:23:27 -0500 | [diff] [blame] | 25 | #include "util.h" |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 26 | |
| 27 | /** |
| 28 | * gfs2_drevalidate - Check directory lookup consistency |
| 29 | * @dentry: the mapping to check |
| 30 | * @nd: |
| 31 | * |
| 32 | * Check to make sure the lookup necessary to arrive at this inode from its |
| 33 | * parent is still good. |
| 34 | * |
| 35 | * Returns: 1 if the dentry is ok, 0 if it isn't |
| 36 | */ |
| 37 | |
| 38 | static int gfs2_drevalidate(struct dentry *dentry, struct nameidata *nd) |
| 39 | { |
| 40 | struct dentry *parent = dget_parent(dentry); |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 41 | struct gfs2_sbd *sdp = GFS2_SB(parent->d_inode); |
| 42 | struct gfs2_inode *dip = GFS2_I(parent->d_inode); |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 43 | struct inode *inode = dentry->d_inode; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 44 | struct gfs2_holder d_gh; |
| 45 | struct gfs2_inode *ip; |
| 46 | struct gfs2_inum inum; |
| 47 | unsigned int type; |
| 48 | int error; |
| 49 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 50 | if (inode && is_bad_inode(inode)) |
| 51 | goto invalid; |
| 52 | |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 53 | if (sdp->sd_args.ar_localcaching) |
| 54 | goto valid; |
| 55 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 56 | error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh); |
| 57 | if (error) |
| 58 | goto fail; |
| 59 | |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 60 | error = gfs2_dir_search(parent->d_inode, &dentry->d_name, &inum, &type); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 61 | switch (error) { |
| 62 | case 0: |
| 63 | if (!inode) |
| 64 | goto invalid_gunlock; |
| 65 | break; |
| 66 | case -ENOENT: |
| 67 | if (!inode) |
| 68 | goto valid_gunlock; |
| 69 | goto invalid_gunlock; |
| 70 | default: |
| 71 | goto fail_gunlock; |
| 72 | } |
| 73 | |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 74 | ip = GFS2_I(inode); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 75 | |
| 76 | if (!gfs2_inum_equal(&ip->i_num, &inum)) |
| 77 | goto invalid_gunlock; |
| 78 | |
| 79 | if (IF2DT(ip->i_di.di_mode) != type) { |
| 80 | gfs2_consist_inode(dip); |
| 81 | goto fail_gunlock; |
| 82 | } |
| 83 | |
| 84 | valid_gunlock: |
| 85 | gfs2_glock_dq_uninit(&d_gh); |
| 86 | |
| 87 | valid: |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 88 | dput(parent); |
| 89 | return 1; |
| 90 | |
| 91 | invalid_gunlock: |
| 92 | gfs2_glock_dq_uninit(&d_gh); |
| 93 | |
| 94 | invalid: |
| 95 | if (inode && S_ISDIR(inode->i_mode)) { |
| 96 | if (have_submounts(dentry)) |
| 97 | goto valid; |
| 98 | shrink_dcache_parent(dentry); |
| 99 | } |
| 100 | d_drop(dentry); |
| 101 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 102 | dput(parent); |
| 103 | return 0; |
| 104 | |
| 105 | fail_gunlock: |
| 106 | gfs2_glock_dq_uninit(&d_gh); |
| 107 | |
| 108 | fail: |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 109 | dput(parent); |
| 110 | return 0; |
| 111 | } |
| 112 | |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 113 | static int gfs2_dhash(struct dentry *dentry, struct qstr *str) |
| 114 | { |
| 115 | str->hash = gfs2_disk_hash(str->name, str->len); |
| 116 | return 0; |
| 117 | } |
| 118 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 119 | struct dentry_operations gfs2_dops = { |
| 120 | .d_revalidate = gfs2_drevalidate, |
Steven Whitehouse | c752666 | 2006-03-20 12:30:04 -0500 | [diff] [blame] | 121 | .d_hash = gfs2_dhash, |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 122 | }; |
| 123 | |