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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  * @flags: lookup flags
 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, unsigned int flags)
 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 (flags & LOOKUP_RCU)
 48                 return -ECHILD;
 49 
 50         parent = dget_parent(dentry);
 51         sdp = GFS2_SB(d_inode(parent));
 52         dip = GFS2_I(d_inode(parent));
 53         inode = d_inode(dentry);
 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(d_inode(parent), &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         dput(parent);
 97         return 0;
 98 
 99 fail_gunlock:
100         gfs2_glock_dq_uninit(&d_gh);
101 fail:
102         dput(parent);
103         return 0;
104 }
105 
106 static int gfs2_dhash(const struct dentry *dentry, struct qstr *str)
107 {
108         str->hash = gfs2_disk_hash(str->name, str->len);
109         return 0;
110 }
111 
112 static int gfs2_dentry_delete(const struct dentry *dentry)
113 {
114         struct gfs2_inode *ginode;
115 
116         if (d_really_is_negative(dentry))
117                 return 0;
118 
119         ginode = GFS2_I(d_inode(dentry));
120         if (!ginode->i_iopen_gh.gh_gl)
121                 return 0;
122 
123         if (test_bit(GLF_DEMOTE, &ginode->i_iopen_gh.gh_gl->gl_flags))
124                 return 1;
125 
126         return 0;
127 }
128 
129 const struct dentry_operations gfs2_dops = {
130         .d_revalidate = gfs2_drevalidate,
131         .d_hash = gfs2_dhash,
132         .d_delete = gfs2_dentry_delete,
133 };
134 
135 

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