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Linux/fs/gfs2/dentry.c

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  1 /*
  2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
  3  * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
  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
  7  * of the GNU General Public License version 2.
  8  */
  9 
 10 #include <linux/spinlock.h>
 11 #include <linux/completion.h>
 12 #include <linux/buffer_head.h>
 13 #include <linux/gfs2_ondisk.h>
 14 #include <linux/namei.h>
 15 #include <linux/crc32.h>
 16 
 17 #include "gfs2.h"
 18 #include "incore.h"
 19 #include "dir.h"
 20 #include "glock.h"
 21 #include "super.h"
 22 #include "util.h"
 23 #include "inode.h"
 24 
 25 /**
 26  * gfs2_drevalidate - Check directory lookup consistency
 27  * @dentry: the mapping to check
 28  * @nd:
 29  *
 30  * Check to make sure the lookup necessary to arrive at this inode from its
 31  * parent is still good.
 32  *
 33  * Returns: 1 if the dentry is ok, 0 if it isn't
 34  */
 35 
 36 static int gfs2_drevalidate(struct dentry *dentry, struct nameidata *nd)
 37 {
 38         struct dentry *parent;
 39         struct gfs2_sbd *sdp;
 40         struct gfs2_inode *dip;
 41         struct inode *inode;
 42         struct gfs2_holder d_gh;
 43         struct gfs2_inode *ip = NULL;
 44         int error;
 45         int had_lock = 0;
 46 
 47         if (nd && nd->flags & LOOKUP_RCU)
 48                 return -ECHILD;
 49 
 50         parent = dget_parent(dentry);
 51         sdp = GFS2_SB(parent->d_inode);
 52         dip = GFS2_I(parent->d_inode);
 53         inode = dentry->d_inode;
 54 
 55         if (inode) {
 56                 if (is_bad_inode(inode))
 57                         goto invalid;
 58                 ip = GFS2_I(inode);
 59         }
 60 
 61         if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
 62                 goto valid;
 63 
 64         had_lock = (gfs2_glock_is_locked_by_me(dip->i_gl) != NULL);
 65         if (!had_lock) {
 66                 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
 67                 if (error)
 68                         goto fail;
 69         } 
 70 
 71         error = gfs2_dir_check(parent->d_inode, &dentry->d_name, ip);
 72         switch (error) {
 73         case 0:
 74                 if (!inode)
 75                         goto invalid_gunlock;
 76                 break;
 77         case -ENOENT:
 78                 if (!inode)
 79                         goto valid_gunlock;
 80                 goto invalid_gunlock;
 81         default:
 82                 goto fail_gunlock;
 83         }
 84 
 85 valid_gunlock:
 86         if (!had_lock)
 87                 gfs2_glock_dq_uninit(&d_gh);
 88 valid:
 89         dput(parent);
 90         return 1;
 91 
 92 invalid_gunlock:
 93         if (!had_lock)
 94                 gfs2_glock_dq_uninit(&d_gh);
 95 invalid:
 96         if (inode && S_ISDIR(inode->i_mode)) {
 97                 if (have_submounts(dentry))
 98                         goto valid;
 99                 shrink_dcache_parent(dentry);
100         }
101         d_drop(dentry);
102         dput(parent);
103         return 0;
104 
105 fail_gunlock:
106         gfs2_glock_dq_uninit(&d_gh);
107 fail:
108         dput(parent);
109         return 0;
110 }
111 
112 static int gfs2_dhash(const struct dentry *dentry, const struct inode *inode,
113                 struct qstr *str)
114 {
115         str->hash = gfs2_disk_hash(str->name, str->len);
116         return 0;
117 }
118 
119 static int gfs2_dentry_delete(const struct dentry *dentry)
120 {
121         struct gfs2_inode *ginode;
122 
123         if (!dentry->d_inode)
124                 return 0;
125 
126         ginode = GFS2_I(dentry->d_inode);
127         if (!ginode->i_iopen_gh.gh_gl)
128                 return 0;
129 
130         if (test_bit(GLF_DEMOTE, &ginode->i_iopen_gh.gh_gl->gl_flags))
131                 return 1;
132 
133         return 0;
134 }
135 
136 const struct dentry_operations gfs2_dops = {
137         .d_revalidate = gfs2_drevalidate,
138         .d_hash = gfs2_dhash,
139         .d_delete = gfs2_dentry_delete,
140 };
141 
142 

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