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[/] [test_project/] [trunk/] [linux_sd_driver/] [fs/] [gfs2/] [ops_export.c] - Blame information for rev 62

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/*
 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
 * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
 *
 * This copyrighted material is made available to anyone wishing to use,
 * modify, copy, or redistribute it subject to the terms and conditions
 * of the GNU General Public License version 2.
 */
 
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/completion.h>
#include <linux/buffer_head.h>
#include <linux/exportfs.h>
#include <linux/gfs2_ondisk.h>
#include <linux/crc32.h>
#include <linux/lm_interface.h>
 
#include "gfs2.h"
#include "incore.h"
#include "dir.h"
#include "glock.h"
#include "glops.h"
#include "inode.h"
#include "ops_dentry.h"
#include "ops_fstype.h"
#include "rgrp.h"
#include "util.h"
 
#define GFS2_SMALL_FH_SIZE 4
#define GFS2_LARGE_FH_SIZE 8
#define GFS2_OLD_FH_SIZE 10
 
static int gfs2_encode_fh(struct dentry *dentry, __u32 *p, int *len,
                          int connectable)
{
        __be32 *fh = (__force __be32 *)p;
        struct inode *inode = dentry->d_inode;
        struct super_block *sb = inode->i_sb;
        struct gfs2_inode *ip = GFS2_I(inode);
 
        if (*len < GFS2_SMALL_FH_SIZE ||
            (connectable && *len < GFS2_LARGE_FH_SIZE))
                return 255;
 
        fh[0] = cpu_to_be32(ip->i_no_formal_ino >> 32);
        fh[1] = cpu_to_be32(ip->i_no_formal_ino & 0xFFFFFFFF);
        fh[2] = cpu_to_be32(ip->i_no_addr >> 32);
        fh[3] = cpu_to_be32(ip->i_no_addr & 0xFFFFFFFF);
        *len = GFS2_SMALL_FH_SIZE;
 
        if (!connectable || inode == sb->s_root->d_inode)
                return *len;
 
        spin_lock(&dentry->d_lock);
        inode = dentry->d_parent->d_inode;
        ip = GFS2_I(inode);
        igrab(inode);
        spin_unlock(&dentry->d_lock);
 
        fh[4] = cpu_to_be32(ip->i_no_formal_ino >> 32);
        fh[5] = cpu_to_be32(ip->i_no_formal_ino & 0xFFFFFFFF);
        fh[6] = cpu_to_be32(ip->i_no_addr >> 32);
        fh[7] = cpu_to_be32(ip->i_no_addr & 0xFFFFFFFF);
        *len = GFS2_LARGE_FH_SIZE;
 
        iput(inode);
 
        return *len;
}
 
struct get_name_filldir {
        struct gfs2_inum_host inum;
        char *name;
};
 
static int get_name_filldir(void *opaque, const char *name, int length,
                            loff_t offset, u64 inum, unsigned int type)
{
        struct get_name_filldir *gnfd = opaque;
 
        if (inum != gnfd->inum.no_addr)
                return 0;
 
        memcpy(gnfd->name, name, length);
        gnfd->name[length] = 0;
 
        return 1;
}
 
static int gfs2_get_name(struct dentry *parent, char *name,
                         struct dentry *child)
{
        struct inode *dir = parent->d_inode;
        struct inode *inode = child->d_inode;
        struct gfs2_inode *dip, *ip;
        struct get_name_filldir gnfd;
        struct gfs2_holder gh;
        u64 offset = 0;
        int error;
 
        if (!dir)
                return -EINVAL;
 
        if (!S_ISDIR(dir->i_mode) || !inode)
                return -EINVAL;
 
        dip = GFS2_I(dir);
        ip = GFS2_I(inode);
 
        *name = 0;
        gnfd.inum.no_addr = ip->i_no_addr;
        gnfd.inum.no_formal_ino = ip->i_no_formal_ino;
        gnfd.name = name;
 
        error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &gh);
        if (error)
                return error;
 
        error = gfs2_dir_read(dir, &offset, &gnfd, get_name_filldir);
 
        gfs2_glock_dq_uninit(&gh);
 
        if (!error && !*name)
                error = -ENOENT;
 
        return error;
}
 
static struct dentry *gfs2_get_parent(struct dentry *child)
{
        struct qstr dotdot;
        struct inode *inode;
        struct dentry *dentry;
 
        gfs2_str2qstr(&dotdot, "..");
        inode = gfs2_lookupi(child->d_inode, &dotdot, 1, NULL);
 
        if (!inode)
                return ERR_PTR(-ENOENT);
        /*
         * In case of an error, @inode carries the error value, and we
         * have to return that as a(n invalid) pointer to dentry.
         */
        if (IS_ERR(inode))
                return ERR_PTR(PTR_ERR(inode));
 
        dentry = d_alloc_anon(inode);
        if (!dentry) {
                iput(inode);
                return ERR_PTR(-ENOMEM);
        }
 
        dentry->d_op = &gfs2_dops;
        return dentry;
}
 
static struct dentry *gfs2_get_dentry(struct super_block *sb,
                struct gfs2_inum_host *inum)
{
        struct gfs2_sbd *sdp = sb->s_fs_info;
        struct gfs2_holder i_gh, ri_gh, rgd_gh;
        struct gfs2_rgrpd *rgd;
        struct inode *inode;
        struct dentry *dentry;
        int error;
 
        /* System files? */
 
        inode = gfs2_ilookup(sb, inum->no_addr);
        if (inode) {
                if (GFS2_I(inode)->i_no_formal_ino != inum->no_formal_ino) {
                        iput(inode);
                        return ERR_PTR(-ESTALE);
                }
                goto out_inode;
        }
 
        error = gfs2_glock_nq_num(sdp, inum->no_addr, &gfs2_inode_glops,
                                  LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
        if (error)
                return ERR_PTR(error);
 
        error = gfs2_rindex_hold(sdp, &ri_gh);
        if (error)
                goto fail;
 
        error = -EINVAL;
        rgd = gfs2_blk2rgrpd(sdp, inum->no_addr);
        if (!rgd)
                goto fail_rindex;
 
        error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_SHARED, 0, &rgd_gh);
        if (error)
                goto fail_rindex;
 
        error = -ESTALE;
        if (gfs2_get_block_type(rgd, inum->no_addr) != GFS2_BLKST_DINODE)
                goto fail_rgd;
 
        gfs2_glock_dq_uninit(&rgd_gh);
        gfs2_glock_dq_uninit(&ri_gh);
 
        inode = gfs2_inode_lookup(sb, DT_UNKNOWN,
                                        inum->no_addr,
                                        0, 0);
        if (!inode)
                goto fail;
        if (IS_ERR(inode)) {
                error = PTR_ERR(inode);
                goto fail;
        }
 
        error = gfs2_inode_refresh(GFS2_I(inode));
        if (error) {
                iput(inode);
                goto fail;
        }
 
        /* Pick up the works we bypass in gfs2_inode_lookup */
        if (inode->i_state & I_NEW)
                gfs2_set_iop(inode);
 
        if (GFS2_I(inode)->i_no_formal_ino != inum->no_formal_ino) {
                iput(inode);
                goto fail;
        }
 
        error = -EIO;
        if (GFS2_I(inode)->i_di.di_flags & GFS2_DIF_SYSTEM) {
                iput(inode);
                goto fail;
        }
 
        gfs2_glock_dq_uninit(&i_gh);
 
out_inode:
        dentry = d_alloc_anon(inode);
        if (!dentry) {
                iput(inode);
                return ERR_PTR(-ENOMEM);
        }
 
        dentry->d_op = &gfs2_dops;
        return dentry;
 
fail_rgd:
        gfs2_glock_dq_uninit(&rgd_gh);
 
fail_rindex:
        gfs2_glock_dq_uninit(&ri_gh);
 
fail:
        gfs2_glock_dq_uninit(&i_gh);
        return ERR_PTR(error);
}
 
static struct dentry *gfs2_fh_to_dentry(struct super_block *sb, struct fid *fid,
                int fh_len, int fh_type)
{
        struct gfs2_inum_host this;
        __be32 *fh = (__force __be32 *)fid->raw;
 
        switch (fh_type) {
        case GFS2_SMALL_FH_SIZE:
        case GFS2_LARGE_FH_SIZE:
        case GFS2_OLD_FH_SIZE:
                this.no_formal_ino = ((u64)be32_to_cpu(fh[0])) << 32;
                this.no_formal_ino |= be32_to_cpu(fh[1]);
                this.no_addr = ((u64)be32_to_cpu(fh[2])) << 32;
                this.no_addr |= be32_to_cpu(fh[3]);
                return gfs2_get_dentry(sb, &this);
        default:
                return NULL;
        }
}
 
static struct dentry *gfs2_fh_to_parent(struct super_block *sb, struct fid *fid,
                int fh_len, int fh_type)
{
        struct gfs2_inum_host parent;
        __be32 *fh = (__force __be32 *)fid->raw;
 
        switch (fh_type) {
        case GFS2_LARGE_FH_SIZE:
        case GFS2_OLD_FH_SIZE:
                parent.no_formal_ino = ((u64)be32_to_cpu(fh[4])) << 32;
                parent.no_formal_ino |= be32_to_cpu(fh[5]);
                parent.no_addr = ((u64)be32_to_cpu(fh[6])) << 32;
                parent.no_addr |= be32_to_cpu(fh[7]);
                return gfs2_get_dentry(sb, &parent);
        default:
                return NULL;
        }
}
 
const struct export_operations gfs2_export_ops = {
        .encode_fh = gfs2_encode_fh,
        .fh_to_dentry = gfs2_fh_to_dentry,
        .fh_to_parent = gfs2_fh_to_parent,
        .get_name = gfs2_get_name,
        .get_parent = gfs2_get_parent,
};
 

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[/] [test_project/] [trunk/] [linux_sd_driver/] [fs/] [gfs2/] [ops_export.c] - Blame information for rev 62

Line No.	Rev	Author	Line
1	62	marcus.erl	`/*`
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/slab.h>`
11			`#include <linux/spinlock.h>`
12			`#include <linux/completion.h>`
13			`#include <linux/buffer_head.h>`
14			`#include <linux/exportfs.h>`
15			`#include <linux/gfs2_ondisk.h>`
16			`#include <linux/crc32.h>`
17			`#include <linux/lm_interface.h>`
18
19			`#include "gfs2.h"`
20			`#include "incore.h"`
21			`#include "dir.h"`
22			`#include "glock.h"`
23			`#include "glops.h"`
24			`#include "inode.h"`
25			`#include "ops_dentry.h"`
26			`#include "ops_fstype.h"`
27			`#include "rgrp.h"`
28			`#include "util.h"`
29
30			`#define GFS2_SMALL_FH_SIZE 4`
31			`#define GFS2_LARGE_FH_SIZE 8`
32			`#define GFS2_OLD_FH_SIZE 10`
33
34			`static int gfs2_encode_fh(struct dentry dentry, __u32 p, int *len,`
35			`int connectable)`
36			`{`
37			`__be32 fh = (__force __be32 )p;`
38			`struct inode *inode = dentry->d_inode;`
39			`struct super_block *sb = inode->i_sb;`
40			`struct gfs2_inode *ip = GFS2_I(inode);`
41
42			`if (*len < GFS2_SMALL_FH_SIZE \|\|`
43			`(connectable && *len < GFS2_LARGE_FH_SIZE))`
44			`return 255;`
45
46			`fh[0] = cpu_to_be32(ip->i_no_formal_ino >> 32);`
47			`fh[1] = cpu_to_be32(ip->i_no_formal_ino & 0xFFFFFFFF);`
48			`fh[2] = cpu_to_be32(ip->i_no_addr >> 32);`
49			`fh[3] = cpu_to_be32(ip->i_no_addr & 0xFFFFFFFF);`
50			`*len = GFS2_SMALL_FH_SIZE;`
51
52			`if (!connectable \|\| inode == sb->s_root->d_inode)`
53			`return *len;`
54
55			`spin_lock(&dentry->d_lock);`
56			`inode = dentry->d_parent->d_inode;`
57			`ip = GFS2_I(inode);`
58			`igrab(inode);`
59			`spin_unlock(&dentry->d_lock);`
60
61			`fh[4] = cpu_to_be32(ip->i_no_formal_ino >> 32);`
62			`fh[5] = cpu_to_be32(ip->i_no_formal_ino & 0xFFFFFFFF);`
63			`fh[6] = cpu_to_be32(ip->i_no_addr >> 32);`
64			`fh[7] = cpu_to_be32(ip->i_no_addr & 0xFFFFFFFF);`
65			`*len = GFS2_LARGE_FH_SIZE;`
66
67			`iput(inode);`
68
69			`return *len;`
70			`}`
71
72			`struct get_name_filldir {`
73			`struct gfs2_inum_host inum;`
74			`char *name;`
75			`};`
76
77			`static int get_name_filldir(void opaque, const char name, int length,`
78			`loff_t offset, u64 inum, unsigned int type)`
79			`{`
80			`struct get_name_filldir *gnfd = opaque;`
81
82			`if (inum != gnfd->inum.no_addr)`
83			`return 0;`
84
85			`memcpy(gnfd->name, name, length);`
86			`gnfd->name[length] = 0;`
87
88			`return 1;`
89			`}`
90
91			`static int gfs2_get_name(struct dentry parent, char name,`
92			`struct dentry *child)`
93			`{`
94			`struct inode *dir = parent->d_inode;`
95			`struct inode *inode = child->d_inode;`
96			`struct gfs2_inode dip, ip;`
97			`struct get_name_filldir gnfd;`
98			`struct gfs2_holder gh;`
99			`u64 offset = 0;`
100			`int error;`
101
102			`if (!dir)`
103			`return -EINVAL;`
104
105			`if (!S_ISDIR(dir->i_mode) \|\| !inode)`
106			`return -EINVAL;`
107
108			`dip = GFS2_I(dir);`
109			`ip = GFS2_I(inode);`
110
111			`*name = 0;`
112			`gnfd.inum.no_addr = ip->i_no_addr;`
113			`gnfd.inum.no_formal_ino = ip->i_no_formal_ino;`
114			`gnfd.name = name;`
115
116			`error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &gh);`
117			`if (error)`
118			`return error;`
119
120			`error = gfs2_dir_read(dir, &offset, &gnfd, get_name_filldir);`
121
122			`gfs2_glock_dq_uninit(&gh);`
123
124			`if (!error && !*name)`
125			`error = -ENOENT;`
126
127			`return error;`
128			`}`
129
130			`static struct dentry gfs2_get_parent(struct dentry child)`
131			`{`
132			`struct qstr dotdot;`
133			`struct inode *inode;`
134			`struct dentry *dentry;`
135
136			`gfs2_str2qstr(&dotdot, "..");`
137			`inode = gfs2_lookupi(child->d_inode, &dotdot, 1, NULL);`
138
139			`if (!inode)`
140			`return ERR_PTR(-ENOENT);`
141			`/*`
142			`* In case of an error, @inode carries the error value, and we`
143			`* have to return that as a(n invalid) pointer to dentry.`
144			`*/`
145			`if (IS_ERR(inode))`
146			`return ERR_PTR(PTR_ERR(inode));`
147
148			`dentry = d_alloc_anon(inode);`
149			`if (!dentry) {`
150			`iput(inode);`
151			`return ERR_PTR(-ENOMEM);`
152			`}`
153
154			`dentry->d_op = &gfs2_dops;`
155			`return dentry;`
156			`}`
157
158			`static struct dentry gfs2_get_dentry(struct super_block sb,`
159			`struct gfs2_inum_host *inum)`
160			`{`
161			`struct gfs2_sbd *sdp = sb->s_fs_info;`
162			`struct gfs2_holder i_gh, ri_gh, rgd_gh;`
163			`struct gfs2_rgrpd *rgd;`
164			`struct inode *inode;`
165			`struct dentry *dentry;`
166			`int error;`
167
168			`/* System files? */`
169
170			`inode = gfs2_ilookup(sb, inum->no_addr);`
171			`if (inode) {`
172			`if (GFS2_I(inode)->i_no_formal_ino != inum->no_formal_ino) {`
173			`iput(inode);`
174			`return ERR_PTR(-ESTALE);`
175			`}`
176			`goto out_inode;`
177			`}`
178
179			`error = gfs2_glock_nq_num(sdp, inum->no_addr, &gfs2_inode_glops,`
180			`LM_ST_SHARED, LM_FLAG_ANY, &i_gh);`
181			`if (error)`
182			`return ERR_PTR(error);`
183
184			`error = gfs2_rindex_hold(sdp, &ri_gh);`
185			`if (error)`
186			`goto fail;`
187
188			`error = -EINVAL;`
189			`rgd = gfs2_blk2rgrpd(sdp, inum->no_addr);`
190			`if (!rgd)`
191			`goto fail_rindex;`
192
193			`error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_SHARED, 0, &rgd_gh);`
194			`if (error)`
195			`goto fail_rindex;`
196
197			`error = -ESTALE;`
198			`if (gfs2_get_block_type(rgd, inum->no_addr) != GFS2_BLKST_DINODE)`
199			`goto fail_rgd;`
200
201			`gfs2_glock_dq_uninit(&rgd_gh);`
202			`gfs2_glock_dq_uninit(&ri_gh);`
203
204			`inode = gfs2_inode_lookup(sb, DT_UNKNOWN,`
205			`inum->no_addr,`
206			`0, 0);`
207			`if (!inode)`
208			`goto fail;`
209			`if (IS_ERR(inode)) {`
210			`error = PTR_ERR(inode);`
211			`goto fail;`
212			`}`
213
214			`error = gfs2_inode_refresh(GFS2_I(inode));`
215			`if (error) {`
216			`iput(inode);`
217			`goto fail;`
218			`}`
219
220			`/* Pick up the works we bypass in gfs2_inode_lookup */`
221			`if (inode->i_state & I_NEW)`
222			`gfs2_set_iop(inode);`
223
224			`if (GFS2_I(inode)->i_no_formal_ino != inum->no_formal_ino) {`
225			`iput(inode);`
226			`goto fail;`
227			`}`
228
229			`error = -EIO;`
230			`if (GFS2_I(inode)->i_di.di_flags & GFS2_DIF_SYSTEM) {`
231			`iput(inode);`
232			`goto fail;`
233			`}`
234
235			`gfs2_glock_dq_uninit(&i_gh);`
236
237			`out_inode:`
238			`dentry = d_alloc_anon(inode);`
239			`if (!dentry) {`
240			`iput(inode);`
241			`return ERR_PTR(-ENOMEM);`
242			`}`
243
244			`dentry->d_op = &gfs2_dops;`
245			`return dentry;`
246
247			`fail_rgd:`
248			`gfs2_glock_dq_uninit(&rgd_gh);`
249
250			`fail_rindex:`
251			`gfs2_glock_dq_uninit(&ri_gh);`
252
253			`fail:`
254			`gfs2_glock_dq_uninit(&i_gh);`
255			`return ERR_PTR(error);`
256			`}`
257
258			`static struct dentry gfs2_fh_to_dentry(struct super_block sb, struct fid *fid,`
259			`int fh_len, int fh_type)`
260			`{`
261			`struct gfs2_inum_host this;`
262			`__be32 fh = (__force __be32 )fid->raw;`
263
264			`switch (fh_type) {`
265			`case GFS2_SMALL_FH_SIZE:`
266			`case GFS2_LARGE_FH_SIZE:`
267			`case GFS2_OLD_FH_SIZE:`
268			`this.no_formal_ino = ((u64)be32_to_cpu(fh[0])) << 32;`
269			`this.no_formal_ino \|= be32_to_cpu(fh[1]);`
270			`this.no_addr = ((u64)be32_to_cpu(fh[2])) << 32;`
271			`this.no_addr \|= be32_to_cpu(fh[3]);`
272			`return gfs2_get_dentry(sb, &this);`
273			`default:`
274			`return NULL;`
275			`}`
276			`}`
277
278			`static struct dentry gfs2_fh_to_parent(struct super_block sb, struct fid *fid,`
279			`int fh_len, int fh_type)`
280			`{`
281			`struct gfs2_inum_host parent;`
282			`__be32 fh = (__force __be32 )fid->raw;`
283
284			`switch (fh_type) {`
285			`case GFS2_LARGE_FH_SIZE:`
286			`case GFS2_OLD_FH_SIZE:`
287			`parent.no_formal_ino = ((u64)be32_to_cpu(fh[4])) << 32;`
288			`parent.no_formal_ino \|= be32_to_cpu(fh[5]);`
289			`parent.no_addr = ((u64)be32_to_cpu(fh[6])) << 32;`
290			`parent.no_addr \|= be32_to_cpu(fh[7]);`
291			`return gfs2_get_dentry(sb, &parent);`
292			`default:`
293			`return NULL;`
294			`}`
295			`}`
296
297			`const struct export_operations gfs2_export_ops = {`
298			`.encode_fh = gfs2_encode_fh,`
299			`.fh_to_dentry = gfs2_fh_to_dentry,`
300			`.fh_to_parent = gfs2_fh_to_parent,`
301			`.get_name = gfs2_get_name,`
302			`.get_parent = gfs2_get_parent,`
303			`};`
304