Release 4.10 fs/ext2/namei.c

/*
 * linux/fs/ext2/namei.c
 *
 * Rewrite to pagecache. Almost all code had been changed, so blame me
 * if the things go wrong. Please, send bug reports to
 * viro@parcelfarce.linux.theplanet.co.uk
 *
 * Stuff here is basically a glue between the VFS and generic UNIXish
 * filesystem that keeps everything in pagecache. All knowledge of the
 * directory layout is in fs/ext2/dir.c - it turned out to be easily separatable
 * and it's easier to debug that way. In principle we might want to
 * generalize that a bit and turn it into a library. Or not.
 *
 * The only non-static object here is ext2_dir_inode_operations.
 *
 * TODO: get rid of kmap() use, add readahead.
 *
 * Copyright (C) 1992, 1993, 1994, 1995
 * Remy Card (card@masi.ibp.fr)
 * Laboratoire MASI - Institut Blaise Pascal
 * Universite Pierre et Marie Curie (Paris VI)
 *
 *  from
 *
 *  linux/fs/minix/namei.c
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 *
 *  Big-endian to little-endian byte-swapping/bitmaps by
 *        David S. Miller (davem@caip.rutgers.edu), 1995
 */

#include <linux/pagemap.h>
#include <linux/quotaops.h>
#include "ext2.h"
#include "xattr.h"
#include "acl.h"



static inline int ext2_add_nondir(struct dentry *dentry, struct inode *inode)
{
	int err = ext2_add_link(dentry, inode);
	if (!err) {
		unlock_new_inode(inode);
		d_instantiate(dentry, inode);
		return 0;
	}
	inode_dec_link_count(inode);
	unlock_new_inode(inode);
	iput(inode);
	return err;
}

Contributors
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Tokens
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CommitProp
linus torvalds
linus torvalds
35
52.24%
1
14.29%
pre-git
pre-git
18
26.87%
3
42.86%
al viro
al viro
13
19.40%
2
28.57%
alexey dobriyan
alexey dobriyan
1
1.49%
1
14.29%
Total
67
100.00%
7
100.00%

/*
 * Methods themselves.
 */



static struct dentry *ext2_lookup(struct inode * dir, struct dentry *dentry, unsigned int flags)
{
	struct inode * inode;
	ino_t ino;
	
	if (dentry->d_name.len > EXT2_NAME_LEN)
		return ERR_PTR(-ENAMETOOLONG);

	ino = ext2_inode_by_name(dir, &dentry->d_name);
	inode = NULL;
	if (ino) {
		inode = ext2_iget(dir->i_sb, ino);
		if (inode == ERR_PTR(-ESTALE)) {
			ext2_error(dir->i_sb, __func__,
					"deleted inode referenced: %lu",
					(unsigned long) ino);
			return ERR_PTR(-EIO);
		}
	}
	return d_splice_alias(inode, dentry);
}

Contributors
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CommitProp
pre-git
pre-git
42
33.87%
3
25.00%
linus torvalds
linus torvalds
32
25.81%
1
8.33%
bryan donlan
bryan donlan
27
21.77%
1
8.33%
al viro
al viro
9
7.26%
3
25.00%
neil brown
neil brown
8
6.45%
1
8.33%
heiko carstens
heiko carstens
4
3.23%
1
8.33%
trond myklebust
trond myklebust
1
0.81%
1
8.33%
david howells
david howells
1
0.81%
1
8.33%
Total
124
100.00%
12
100.00%



struct dentry *ext2_get_parent(struct dentry *child)
{
	struct qstr dotdot = QSTR_INIT("..", 2);
	unsigned long ino = ext2_inode_by_name(d_inode(child), &dotdot);
	if (!ino)
		return ERR_PTR(-ENOENT);
	return d_obtain_alias(ext2_iget(child->d_sb, ino));
} 

Contributors
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Tokens
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Commits
CommitProp
neil brown
neil brown
43
68.25%
1
14.29%
al viro
al viro
8
12.70%
2
28.57%
david howells
david howells
5
7.94%
2
28.57%
linus torvalds
linus torvalds
4
6.35%
1
14.29%
christoph hellwig
christoph hellwig
3
4.76%
1
14.29%
Total
63
100.00%
7
100.00%

/*
 * By the time this is called, we already have created
 * the directory cache entry for the new file, but it
 * is so far negative - it has no inode.
 *
 * If the create succeeds, we fill in the inode information
 * with d_instantiate(). 
 */


static int ext2_create (struct inode * dir, struct dentry * dentry, umode_t mode, bool excl)
{
	struct inode *inode;
	int err;

	err = dquot_initialize(dir);
	if (err)
		return err;

	inode = ext2_new_inode(dir, mode, &dentry->d_name);
	if (IS_ERR(inode))
		return PTR_ERR(inode);

	inode->i_op = &ext2_file_inode_operations;
	if (test_opt(inode->i_sb, NOBH)) {
		inode->i_mapping->a_ops = &ext2_nobh_aops;
		inode->i_fop = &ext2_file_operations;
	} else {
		inode->i_mapping->a_ops = &ext2_aops;
		inode->i_fop = &ext2_file_operations;
	}
	mark_inode_dirty(inode);
	return ext2_add_nondir(dentry, inode);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
linus torvalds
linus torvalds
41
29.50%
1
7.69%
carsten otte
carsten otte
24
17.27%
1
7.69%
pre-git
pre-git
22
15.83%
2
15.38%
christoph hellwig
christoph hellwig
16
11.51%
2
15.38%
andrew morton
andrew morton
13
9.35%
1
7.69%
jan kara
jan kara
12
8.63%
1
7.69%
eric paris
eric paris
5
3.60%
1
7.69%
al viro
al viro
3
2.16%
2
15.38%
matthew wilcox
matthew wilcox
2
1.44%
1
7.69%
trond myklebust
trond myklebust
1
0.72%
1
7.69%
Total
139
100.00%
13
100.00%



static int ext2_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
{
	struct inode *inode = ext2_new_inode(dir, mode, NULL);
	if (IS_ERR(inode))
		return PTR_ERR(inode);

	inode->i_op = &ext2_file_inode_operations;
	if (test_opt(inode->i_sb, NOBH)) {
		inode->i_mapping->a_ops = &ext2_nobh_aops;
		inode->i_fop = &ext2_file_operations;
	} else {
		inode->i_mapping->a_ops = &ext2_aops;
		inode->i_fop = &ext2_file_operations;
	}
	mark_inode_dirty(inode);
	d_tmpfile(dentry, inode);
	unlock_new_inode(inode);
	return 0;
}

Contributors
Person
Tokens
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Commits
CommitProp
al viro
al viro
119
98.35%
1
50.00%
matthew wilcox
matthew wilcox
2
1.65%
1
50.00%
Total
121
100.00%
2
100.00%



static int ext2_mknod (struct inode * dir, struct dentry *dentry, umode_t mode, dev_t rdev)
{
	struct inode * inode;
	int err;

	err = dquot_initialize(dir);
	if (err)
		return err;

	inode = ext2_new_inode (dir, mode, &dentry->d_name);
	err = PTR_ERR(inode);
	if (!IS_ERR(inode)) {
		init_special_inode(inode, inode->i_mode, rdev);
#ifdef CONFIG_EXT2_FS_XATTR
		inode->i_op = &ext2_special_inode_operations;
#endif
		mark_inode_dirty(inode);
		err = ext2_add_nondir(dentry, inode);
	}
	return err;
}

Contributors
Person
Tokens
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Commits
CommitProp
linus torvalds
linus torvalds
49
42.61%
1
8.33%
pre-git
pre-git
21
18.26%
2
16.67%
theodore tso
theodore tso
14
12.17%
1
8.33%
al viro
al viro
10
8.70%
2
16.67%
jan kara
jan kara
9
7.83%
1
8.33%
christoph hellwig
christoph hellwig
5
4.35%
2
16.67%
eric paris
eric paris
5
4.35%
1
8.33%
andrew morton
andrew morton
1
0.87%
1
8.33%
andries brouwer
andries brouwer
1
0.87%
1
8.33%
Total
115
100.00%
12
100.00%



static int ext2_symlink (struct inode * dir, struct dentry * dentry,
	const char * symname)
{
	struct super_block * sb = dir->i_sb;
	int err = -ENAMETOOLONG;
	unsigned l = strlen(symname)+1;
	struct inode * inode;

	if (l > sb->s_blocksize)
		goto out;

	err = dquot_initialize(dir);
	if (err)
		goto out;

	inode = ext2_new_inode (dir, S_IFLNK | S_IRWXUGO, &dentry->d_name);
	err = PTR_ERR(inode);
	if (IS_ERR(inode))
		goto out;

	if (l > sizeof (EXT2_I(inode)->i_data)) {
		/* slow symlink */
		inode->i_op = &ext2_symlink_inode_operations;
		inode_nohighmem(inode);
		if (test_opt(inode->i_sb, NOBH))
			inode->i_mapping->a_ops = &ext2_nobh_aops;
		else
			inode->i_mapping->a_ops = &ext2_aops;
		err = page_symlink(inode, symname, l);
		if (err)
			goto out_fail;
	} else {
		/* fast symlink */
		inode->i_op = &ext2_fast_symlink_inode_operations;
		inode->i_link = (char*)EXT2_I(inode)->i_data;
		memcpy(inode->i_link, symname, l);
		inode->i_size = l-1;
	}
	mark_inode_dirty(inode);

	err = ext2_add_nondir(dentry, inode);
out:
	return err;

out_fail:
	inode_dec_link_count(inode);
	unlock_new_inode(inode);
	iput (inode);
	goto out;
}

Contributors
Person
Tokens
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CommitProp
linus torvalds
linus torvalds
122
45.19%
2
8.70%
pre-git
pre-git
85
31.48%
10
43.48%
andrew morton
andrew morton
22
8.15%
2
8.70%
al viro
al viro
20
7.41%
3
13.04%
jan kara
jan kara
9
3.33%
1
4.35%
christoph hellwig
christoph hellwig
5
1.85%
2
8.70%
eric paris
eric paris
5
1.85%
1
4.35%
alexey dobriyan
alexey dobriyan
1
0.37%
1
4.35%
theodore tso
theodore tso
1
0.37%
1
4.35%
Total
270
100.00%
23
100.00%



static int ext2_link (struct dentry * old_dentry, struct inode * dir,
	struct dentry *dentry)
{
	struct inode *inode = d_inode(old_dentry);
	int err;

	err = dquot_initialize(dir);
	if (err)
		return err;

	inode->i_ctime = current_time(inode);
	inode_inc_link_count(inode);
	ihold(inode);

	err = ext2_add_link(dentry, inode);
	if (!err) {
		d_instantiate(dentry, inode);
		return 0;
	}
	inode_dec_link_count(inode);
	iput(inode);
	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
al viro
al viro
37
34.91%
2
14.29%
pre-git
pre-git
32
30.19%
5
35.71%
linus torvalds
linus torvalds
15
14.15%
1
7.14%
jan kara
jan kara
9
8.49%
1
7.14%
christoph hellwig
christoph hellwig
5
4.72%
2
14.29%
deepa dinamani
deepa dinamani
4
3.77%
1
7.14%
david howells
david howells
3
2.83%
1
7.14%
alexey dobriyan
alexey dobriyan
1
0.94%
1
7.14%
Total
106
100.00%
14
100.00%



static int ext2_mkdir(struct inode * dir, struct dentry * dentry, umode_t mode)
{
	struct inode * inode;
	int err;

	err = dquot_initialize(dir);
	if (err)
		return err;

	inode_inc_link_count(dir);

	inode = ext2_new_inode(dir, S_IFDIR | mode, &dentry->d_name);
	err = PTR_ERR(inode);
	if (IS_ERR(inode))
		goto out_dir;

	inode->i_op = &ext2_dir_inode_operations;
	inode->i_fop = &ext2_dir_operations;
	if (test_opt(inode->i_sb, NOBH))
		inode->i_mapping->a_ops = &ext2_nobh_aops;
	else
		inode->i_mapping->a_ops = &ext2_aops;

	inode_inc_link_count(inode);

	err = ext2_make_empty(inode, dir);
	if (err)
		goto out_fail;

	err = ext2_add_link(dentry, inode);
	if (err)
		goto out_fail;

	unlock_new_inode(inode);
	d_instantiate(dentry, inode);
out:
	return err;

out_fail:
	inode_dec_link_count(inode);
	inode_dec_link_count(inode);
	unlock_new_inode(inode);
	iput(inode);
out_dir:
	inode_dec_link_count(dir);
	goto out;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
pre-git
pre-git
91
43.54%
10
50.00%
linus torvalds
linus torvalds
59
28.23%
1
5.00%
andrew morton
andrew morton
21
10.05%
1
5.00%
al viro
al viro
14
6.70%
3
15.00%
jan kara
jan kara
9
4.31%
1
5.00%
alexey dobriyan
alexey dobriyan
5
2.39%
1
5.00%
christoph hellwig
christoph hellwig
5
2.39%
2
10.00%
eric paris
eric paris
5
2.39%
1
5.00%
Total
209
100.00%
20
100.00%



static int ext2_unlink(struct inode * dir, struct dentry *dentry)
{
	struct inode * inode = d_inode(dentry);
	struct ext2_dir_entry_2 * de;
	struct page * page;
	int err;

	err = dquot_initialize(dir);
	if (err)
		goto out;

	de = ext2_find_entry (dir, &dentry->d_name, &page);
	if (!de) {
		err = -ENOENT;
		goto out;
	}

	err = ext2_delete_entry (de, page);
	if (err)
		goto out;

	inode->i_ctime = dir->i_ctime;
	inode_dec_link_count(inode);
	err = 0;
out:
	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
linus torvalds
linus torvalds
67
55.37%
1
9.09%
pre-git
pre-git
26
21.49%
4
36.36%
jan kara
jan kara
16
13.22%
1
9.09%
christoph hellwig
christoph hellwig
5
4.13%
2
18.18%
al viro
al viro
3
2.48%
1
9.09%
david howells
david howells
3
2.48%
1
9.09%
alexey dobriyan
alexey dobriyan
1
0.83%
1
9.09%
Total
121
100.00%
11
100.00%



static int ext2_rmdir (struct inode * dir, struct dentry *dentry)
{
	struct inode * inode = d_inode(dentry);
	int err = -ENOTEMPTY;

	if (ext2_empty_dir(inode)) {
		err = ext2_unlink(dir, dentry);
		if (!err) {
			inode->i_size = 0;
			inode_dec_link_count(inode);
			inode_dec_link_count(dir);
		}
	}
	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
pre-git
pre-git
56
73.68%
7
70.00%
linus torvalds
linus torvalds
15
19.74%
1
10.00%
david howells
david howells
3
3.95%
1
10.00%
alexey dobriyan
alexey dobriyan
2
2.63%
1
10.00%
Total
76
100.00%
10
100.00%



static int ext2_rename (struct inode * old_dir, struct dentry * old_dentry,
			struct inode * new_dir,	struct dentry * new_dentry,
			unsigned int flags)
{
	struct inode * old_inode = d_inode(old_dentry);
	struct inode * new_inode = d_inode(new_dentry);
	struct page * dir_page = NULL;
	struct ext2_dir_entry_2 * dir_de = NULL;
	struct page * old_page;
	struct ext2_dir_entry_2 * old_de;
	int err;

	if (flags & ~RENAME_NOREPLACE)
		return -EINVAL;

	err = dquot_initialize(old_dir);
	if (err)
		goto out;

	err = dquot_initialize(new_dir);
	if (err)
		goto out;

	old_de = ext2_find_entry (old_dir, &old_dentry->d_name, &old_page);
	if (!old_de) {
		err = -ENOENT;
		goto out;
	}

	if (S_ISDIR(old_inode->i_mode)) {
		err = -EIO;
		dir_de = ext2_dotdot(old_inode, &dir_page);
		if (!dir_de)
			goto out_old;
	}

	if (new_inode) {
		struct page *new_page;
		struct ext2_dir_entry_2 *new_de;

		err = -ENOTEMPTY;
		if (dir_de && !ext2_empty_dir (new_inode))
			goto out_dir;

		err = -ENOENT;
		new_de = ext2_find_entry (new_dir, &new_dentry->d_name, &new_page);
		if (!new_de)
			goto out_dir;
		ext2_set_link(new_dir, new_de, new_page, old_inode, 1);
		new_inode->i_ctime = current_time(new_inode);
		if (dir_de)
			drop_nlink(new_inode);
		inode_dec_link_count(new_inode);
	} else {
		err = ext2_add_link(new_dentry, old_inode);
		if (err)
			goto out_dir;
		if (dir_de)
			inode_inc_link_count(new_dir);
	}

	/*
         * Like most other Unix systems, set the ctime for inodes on a
         * rename.
         */
	old_inode->i_ctime = current_time(old_inode);
	mark_inode_dirty(old_inode);

	ext2_delete_entry (old_de, old_page);

	if (dir_de) {
		if (old_dir != new_dir)
			ext2_set_link(old_inode, dir_de, dir_page, new_dir, 0);
		else {
			kunmap(dir_page);
			put_page(dir_page);
		}
		inode_dec_link_count(old_dir);
	}
	return 0;


out_dir:
	if (dir_de) {
		kunmap(dir_page);
		put_page(dir_page);
	}
out_old:
	kunmap(old_page);
	put_page(old_page);
out:
	return err;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
pre-git
pre-git
174
42.54%
19
55.88%
linus torvalds
linus torvalds
123
30.07%
1
2.94%
jan kara
jan kara
35
8.56%
2
5.88%
miklos szeredi
miklos szeredi
15
3.67%
1
2.94%
nicolas pitre
nicolas pitre
12
2.93%
1
2.94%
christoph hellwig
christoph hellwig
10
2.44%
2
5.88%
deepa dinamani
deepa dinamani
8
1.96%
1
2.94%
josh hunt
josh hunt
6
1.47%
1
2.94%
al viro
al viro
6
1.47%
1
2.94%
david howells
david howells
6
1.47%
1
2.94%
andrew morton
andrew morton
5
1.22%
1
2.94%
alexey dobriyan
alexey dobriyan
3
0.73%
1
2.94%
dave hansen
dave hansen
3
0.73%
1
2.94%
kirill a. shutemov
kirill a. shutemov
3
0.73%
1
2.94%
Total
409
100.00%
34
100.00%


const struct inode_operations ext2_dir_inode_operations = {
	.create		= ext2_create,
	.lookup		= ext2_lookup,
	.link		= ext2_link,
	.unlink		= ext2_unlink,
	.symlink	= ext2_symlink,
	.mkdir		= ext2_mkdir,
	.rmdir		= ext2_rmdir,
	.mknod		= ext2_mknod,
	.rename		= ext2_rename,
#ifdef CONFIG_EXT2_FS_XATTR
	.listxattr	= ext2_listxattr,
#endif
	.setattr	= ext2_setattr,
	.get_acl	= ext2_get_acl,
	.set_acl	= ext2_set_acl,
	.tmpfile	= ext2_tmpfile,
};


const struct inode_operations ext2_special_inode_operations = {
#ifdef CONFIG_EXT2_FS_XATTR
	.listxattr	= ext2_listxattr,
#endif
	.setattr	= ext2_setattr,
	.get_acl	= ext2_get_acl,
	.set_acl	= ext2_set_acl,
};
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
pre-git
pre-git
604
30.94%
31
36.90%
linus torvalds
linus torvalds
565
28.94%
3
3.57%
al viro
al viro
247
12.65%
15
17.86%
jan kara
jan kara
99
5.07%
2
2.38%
andrew morton
andrew morton
80
4.10%
5
5.95%
christoph hellwig
christoph hellwig
71
3.64%
5
5.95%
theodore tso
theodore tso
54
2.77%
2
2.38%
neil brown
neil brown
51
2.61%
1
1.19%
bryan donlan
bryan donlan
27
1.38%
1
1.19%
carsten otte
carsten otte
24
1.23%
1
1.19%
david howells
david howells
21
1.08%
2
2.38%
eric paris
eric paris
20
1.02%
1
1.19%
miklos szeredi
miklos szeredi
15
0.77%
1
1.19%
alexey dobriyan
alexey dobriyan
14
0.72%
1
1.19%
deepa dinamani
deepa dinamani
12
0.61%
1
1.19%
nicolas pitre
nicolas pitre
12
0.61%
1
1.19%
james morris
james morris
10
0.51%
1
1.19%
josh hunt
josh hunt
6
0.31%
1
1.19%
heiko carstens
heiko carstens
4
0.20%
1
1.19%
matthew wilcox
matthew wilcox
4
0.20%
1
1.19%
dave hansen
dave hansen
3
0.15%
1
1.19%
kirill a. shutemov
kirill a. shutemov
3
0.15%
1
1.19%
arjan van de ven
arjan van de ven
2
0.10%
1
1.19%
trond myklebust
trond myklebust
2
0.10%
2
2.38%
maximilian attems
maximilian attems
1
0.05%
1
1.19%
andries brouwer
andries brouwer
1
0.05%
1
1.19%
Total
1952
100.00%
84
100.00%
Directory: fs/ext2

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