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| 2 | |
| 3 | * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
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| 4 | * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
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| 5 |
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| 6 |
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| 7 | #include <linux/spinlock.h>
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| 8 | #include <linux/completion.h>
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| 9 | #include <linux/buffer_head.h>
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| 10 | #include <linux/gfs2_ondisk.h>
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| 11 | #include <linux/namei.h>
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| 12 | #include <linux/crc32.h>
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| 13 |
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| 14 | #include "gfs2.h"
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| 15 | #include "incore.h"
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| 16 | #include "dir.h"
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| 17 | #include "glock.h"
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| 18 | #include "super.h"
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| 19 | #include "util.h"
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| 20 | #include "inode.h"
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| 21 |
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| 22 | |
| 23 | * gfs2_drevalidate - Check directory lookup consistency
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| 24 | * @dir: expected parent directory inode
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| 25 | * @name: expexted name
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| 26 | * @dentry: dentry to check
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| 27 | * @flags: lookup flags
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| 28 | *
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| 29 | * Check to make sure the lookup necessary to arrive at this inode from its
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| 30 | * parent is still good.
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| 31 | *
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| 32 | * Returns: 1 if the dentry is ok, 0 if it isn't
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| 33 |
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| 34 |
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| 35 | static int gfs2_drevalidate(struct inode *dir, const struct qstr *name,
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| 36 | struct dentry *dentry, unsigned int flags)
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| 37 | {
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| 38 | struct gfs2_glock *gl = gfs2_inode_glock(dir);
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| 39 | struct gfs2_sbd *sdp = GFS2_SB(dir);
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| 40 | struct inode *inode;
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| 41 | struct gfs2_holder d_gh;
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| 42 | struct gfs2_inode *ip = NULL;
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| 43 | int error, valid;
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| 44 | int had_lock = 0;
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| 45 |
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| 46 | if (flags & LOOKUP_RCU)
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| 47 | return -ECHILD;
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| 48 |
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| 49 | inode = d_inode(dentry);
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| 50 |
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| 51 | if (inode) {
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| 52 | if (is_bad_inode(inode))
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| 53 | return 0;
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| 54 | ip = GFS2_I(inode);
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| 55 | }
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| 56 |
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| 57 | if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
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| 58 | return 1;
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| 59 |
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| 60 | had_lock = (gfs2_glock_is_locked_by_me(gl) != NULL);
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| 61 | if (!had_lock) {
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| 62 | error = gfs2_glock_nq_init(gl, LM_ST_SHARED, 0, &d_gh);
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| 63 | if (error)
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| 64 | return 0;
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| 65 | }
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| 66 |
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| 67 | error = gfs2_dir_check(dir, name, ip);
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| 68 | valid = inode ? !error : (error == -ENOENT);
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| 69 |
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| 70 | if (!had_lock)
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| 71 | gfs2_glock_dq_uninit(&d_gh);
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| 72 | return valid;
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| 73 | }
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| 74 |
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| 75 | static int gfs2_dhash(const struct dentry *dentry, struct qstr *str)
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| 76 | {
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| 77 | str->hash = gfs2_disk_hash(str->name, str->len);
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| 78 | return 0;
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| 79 | }
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| 80 |
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| 81 | static int gfs2_dentry_delete(const struct dentry *dentry)
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| 82 | {
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| 83 | struct gfs2_inode *ginode;
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| 84 |
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| 85 | if (d_really_is_negative(dentry))
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| 86 | return 0;
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| 87 |
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| 88 | ginode = GFS2_I(d_inode(dentry));
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| 89 | if (!gfs2_holder_initialized(&ginode->i_iopen_gh))
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| 90 | return 0;
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| 91 |
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| 92 | if (test_bit(GLF_DEMOTE, &ginode->i_iopen_gh.gh_gl->gl_flags))
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| 93 | return 1;
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| 94 |
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| 95 | return 0;
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| 96 | }
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| 97 |
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| 98 | const struct dentry_operations gfs2_dops = {
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| 99 | .d_revalidate = gfs2_drevalidate,
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| 100 | .d_hash = gfs2_dhash,
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| 101 | .d_delete = gfs2_dentry_delete,
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| 102 | };
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| 103 |
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