Release 4.17 fs/coda/cnode.c

// SPDX-License-Identifier: GPL-2.0
/* cnode related routines for the coda kernel code
   (C) 1996 Peter Braam
   */

#include <linux/types.h>
#include <linux/string.h>
#include <linux/time.h>

#include <linux/coda.h>
#include <linux/coda_psdev.h>
#include <linux/pagemap.h>
#include "coda_linux.h"



static inline int coda_fideq(struct CodaFid *fid1, struct CodaFid *fid2)
{
	return memcmp(fid1, fid2, sizeof(*fid1)) == 0;
}

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Linus Torvalds (pre-git)
17
51.52%
1
20.00%
Jan Harkes
15
45.45%
3
60.00%
Linus Torvalds
1
3.03%
1
20.00%
Total
33
100.00%
5
100.00%


static const struct inode_operations coda_symlink_inode_operations = {
	.get_link	= page_get_link,
	.setattr	= coda_setattr,
};

/* cnode.c */


static void coda_fill_inode(struct inode *inode, struct coda_vattr *attr)
{
        coda_vattr_to_iattr(inode, attr);

        if (S_ISREG(inode->i_mode)) {
                inode->i_op = &coda_file_inode_operations;
                inode->i_fop = &coda_file_operations;
        } else if (S_ISDIR(inode->i_mode)) {
                inode->i_op = &coda_dir_inode_operations;
                inode->i_fop = &coda_dir_operations;
        } else if (S_ISLNK(inode->i_mode)) {
		inode->i_op = &coda_symlink_inode_operations;
		inode_nohighmem(inode);
		inode->i_data.a_ops = &coda_symlink_aops;
		inode->i_mapping = &inode->i_data;
	} else
                init_special_inode(inode, inode->i_mode, huge_decode_dev(attr->va_rdev));
}

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Linus Torvalds (pre-git)
125
93.98%
6
66.67%
Al Viro
8
6.02%
3
33.33%
Total
133
100.00%
9
100.00%



static int coda_test_inode(struct inode *inode, void *data)
{
	struct CodaFid *fid = (struct CodaFid *)data;
	struct coda_inode_info *cii = ITOC(inode);
	return coda_fideq(&cii->c_fid, fid);
}

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Jan Harkes
37
77.08%
2
66.67%
Yoshihisa Abe
11
22.92%
1
33.33%
Total
48
100.00%
3
100.00%



static int coda_set_inode(struct inode *inode, void *data)
{
	struct CodaFid *fid = (struct CodaFid *)data;
	struct coda_inode_info *cii = ITOC(inode);
	cii->c_fid = *fid;
	return 0;
}

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40
85.11%
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7
14.89%
1
33.33%
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47
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3
100.00%



struct inode * coda_iget(struct super_block * sb, struct CodaFid * fid,
			 struct coda_vattr * attr)
{
	struct inode *inode;
	struct coda_inode_info *cii;
	unsigned long hash = coda_f2i(fid);

	inode = iget5_locked(sb, hash, coda_test_inode, coda_set_inode, fid);

	if (!inode)
		return ERR_PTR(-ENOMEM);

	if (inode->i_state & I_NEW) {
		cii = ITOC(inode);
		/* we still need to set i_ino for things like stat(2) */
		inode->i_ino = hash;
		/* inode is locked and unique, no need to grab cii->c_lock */
		cii->c_mapcount = 0;
		unlock_new_inode(inode);
	}

	/* always replace the attributes, type might have changed */
	coda_fill_inode(inode, attr);
	return inode;
}

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Linus Torvalds (pre-git)
56
48.70%
4
30.77%
Jan Harkes
50
43.48%
6
46.15%
Linus Torvalds
8
6.96%
2
15.38%
Yoshihisa Abe
1
0.87%
1
7.69%
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115
100.00%
13
100.00%

/* this is effectively coda_iget:
   - get attributes (might be cached)
   - get the inode for the fid using vfs iget
   - link the two up if this is needed
   - fill in the attributes
*/


struct inode *coda_cnode_make(struct CodaFid *fid, struct super_block *sb)
{
        struct coda_vattr attr;
	struct inode *inode;
        int error;
        
	/* We get inode numbers from Venus -- see venus source */
	error = venus_getattr(sb, fid, &attr);
	if (error)
		return ERR_PTR(error);

	inode = coda_iget(sb, fid, &attr);
	if (IS_ERR(inode))
		pr_warn("%s: coda_iget failed\n", __func__);
	return inode;
}


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Linus Torvalds (pre-git)
65
80.25%
3
42.86%
Al Viro
10
12.35%
1
14.29%
Fabian Frederick
4
4.94%
2
28.57%
Jan Harkes
2
2.47%
1
14.29%
Total
81
100.00%
7
100.00%

/* Although we treat Coda file identifiers as immutable, there is one
 * special case for files created during a disconnection where they may
 * not be globally unique. When an identifier collision is detected we
 * first try to flush the cached inode from the kernel and finally
 * resort to renaming/rehashing in-place. Userspace remembers both old
 * and new values of the identifier to handle any in-flight upcalls.
 * The real solution is to use globally unique UUIDs as identifiers, but
 * retrofitting the existing userspace code for this is non-trivial. */


void coda_replace_fid(struct inode *inode, struct CodaFid *oldfid, 
		      struct CodaFid *newfid)
{
	struct coda_inode_info *cii = ITOC(inode);
	unsigned long hash = coda_f2i(newfid);
	
	BUG_ON(!coda_fideq(&cii->c_fid, oldfid));

	/* replace fid and rehash inode */
	/* XXX we probably need to hold some lock here! */
	remove_inode_hash(inode);
	cii->c_fid = *newfid;
	inode->i_ino = hash;
	__insert_inode_hash(inode, hash);
}

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Linus Torvalds (pre-git)
43
53.75%
2
28.57%
Jan Harkes
15
18.75%
2
28.57%
Linus Torvalds
14
17.50%
1
14.29%
Yoshihisa Abe
5
6.25%
1
14.29%
Eric Sesterhenn / Snakebyte
3
3.75%
1
14.29%
Total
80
100.00%
7
100.00%

/* convert a fid to an inode. */


struct inode *coda_fid_to_inode(struct CodaFid *fid, struct super_block *sb) 
{
	struct inode *inode;
	unsigned long hash = coda_f2i(fid);

	if ( !sb ) {
		pr_warn("%s: no sb!\n", __func__);
		return NULL;
	}

	inode = ilookup5(sb, hash, coda_test_inode, fid);
	if ( !inode )
		return NULL;

	/* we should never see newly created inodes because we intentionally
         * fail in the initialization callback */
	BUG_ON(inode->i_state & I_NEW);

	return inode;
}

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Linus Torvalds (pre-git)
51
62.20%
4
33.33%
Jan Harkes
25
30.49%
5
41.67%
Fabian Frederick
4
4.88%
2
16.67%
Linus Torvalds
2
2.44%
1
8.33%
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82
100.00%
12
100.00%

/* the CONTROL inode is made without asking attributes from Venus */


struct inode *coda_cnode_makectl(struct super_block *sb)
{
	struct inode *inode = new_inode(sb);
	if (inode) {
		inode->i_ino = CTL_INO;
		inode->i_op = &coda_ioctl_inode_operations;
		inode->i_fop = &coda_ioctl_operations;
		inode->i_mode = 0444;
		return inode;
	}
	return ERR_PTR(-ENOMEM);
}

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Linus Torvalds (pre-git)
42
65.62%
3
60.00%
Al Viro
15
23.44%
1
20.00%
Jan Harkes
7
10.94%
1
20.00%
Total
64
100.00%
5
100.00%

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Linus Torvalds (pre-git)
428
58.71%
14
35.00%
Jan Harkes
194
26.61%
9
22.50%
Al Viro
43
5.90%
9
22.50%
Linus Torvalds
26
3.57%
2
5.00%
Yoshihisa Abe
25
3.43%
1
2.50%
Fabian Frederick
8
1.10%
2
5.00%
Eric Sesterhenn / Snakebyte
3
0.41%
1
2.50%
Arjan van de Ven
1
0.14%
1
2.50%
Greg Kroah-Hartman
1
0.14%
1
2.50%
Total
729
100.00%
40
100.00%
Directory: fs/coda

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