Release 4.17 fs/ext2/namei.c
// SPDX-License-Identifier: GPL-2.0
/*
* 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) {
d_instantiate_new(dentry, inode);
return 0;
}
inode_dec_link_count(inode);
unlock_new_inode(inode);
iput(inode);
return err;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Linus Torvalds | 28 | 45.16% | 1 | 11.11% |
Linus Torvalds (pre-git) | 21 | 33.87% | 4 | 44.44% |
Al Viro | 12 | 19.35% | 3 | 33.33% |
Alexey Dobriyan | 1 | 1.61% | 1 | 11.11% |
Total | 62 | 100.00% | 9 | 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
Person | Tokens | Prop | Commits | CommitProp |
Linus Torvalds (pre-git) | 42 | 33.87% | 3 | 25.00% |
Linus Torvalds | 32 | 25.81% | 1 | 8.33% |
Bryan Donlan | 27 | 21.77% | 1 | 8.33% |
Al Viro | 9 | 7.26% | 3 | 25.00% |
Neil Brown | 8 | 6.45% | 1 | 8.33% |
Heiko Carstens | 4 | 3.23% | 1 | 8.33% |
Trond Myklebust | 1 | 0.81% | 1 | 8.33% |
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
Person | Tokens | Prop | Commits | CommitProp |
Neil Brown | 43 | 68.25% | 1 | 14.29% |
Al Viro | 8 | 12.70% | 2 | 28.57% |
David Howells | 5 | 7.94% | 2 | 28.57% |
Linus Torvalds | 4 | 6.35% | 1 | 14.29% |
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);
ext2_set_file_ops(inode);
mark_inode_dirty(inode);
return ext2_add_nondir(dentry, inode);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Linus Torvalds | 29 | 32.58% | 1 | 7.14% |
Linus Torvalds (pre-git) | 19 | 21.35% | 3 | 21.43% |
Christoph Hellwig | 16 | 17.98% | 2 | 14.29% |
Jan Kara | 12 | 13.48% | 1 | 7.14% |
Eric Paris | 5 | 5.62% | 1 | 7.14% |
Al Viro | 3 | 3.37% | 2 | 14.29% |
Carsten Otte | 2 | 2.25% | 1 | 7.14% |
Dan J Williams | 1 | 1.12% | 1 | 7.14% |
Andrew Morton | 1 | 1.12% | 1 | 7.14% |
Trond Myklebust | 1 | 1.12% | 1 | 7.14% |
Total | 89 | 100.00% | 14 | 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);
ext2_set_file_ops(inode);
mark_inode_dirty(inode);
d_tmpfile(dentry, inode);
unlock_new_inode(inode);
return 0;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Al Viro | 70 | 98.59% | 1 | 50.00% |
Dan J Williams | 1 | 1.41% | 1 | 50.00% |
Total | 71 | 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 | Prop | Commits | CommitProp |
Linus Torvalds | 49 | 42.61% | 1 | 8.33% |
Linus Torvalds (pre-git) | 21 | 18.26% | 2 | 16.67% |
Theodore Y. Ts'o | 14 | 12.17% | 1 | 8.33% |
Al Viro | 10 | 8.70% | 2 | 16.67% |
Jan Kara | 9 | 7.83% | 1 | 8.33% |
Eric Paris | 5 | 4.35% | 1 | 8.33% |
Christoph Hellwig | 5 | 4.35% | 2 | 16.67% |
Andries E. Brouwer | 1 | 0.87% | 1 | 8.33% |
Andrew Morton | 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 | Prop | Commits | CommitProp |
Linus Torvalds | 122 | 45.19% | 2 | 8.70% |
Linus Torvalds (pre-git) | 85 | 31.48% | 10 | 43.48% |
Andrew Morton | 22 | 8.15% | 2 | 8.70% |
Al Viro | 20 | 7.41% | 3 | 13.04% |
Jan Kara | 9 | 3.33% | 1 | 4.35% |
Eric Paris | 5 | 1.85% | 1 | 4.35% |
Christoph Hellwig | 5 | 1.85% | 2 | 8.70% |
Theodore Y. Ts'o | 1 | 0.37% | 1 | 4.35% |
Alexey Dobriyan | 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 | 37 | 34.91% | 2 | 14.29% |
Linus Torvalds (pre-git) | 32 | 30.19% | 5 | 35.71% |
Linus Torvalds | 15 | 14.15% | 1 | 7.14% |
Jan Kara | 9 | 8.49% | 1 | 7.14% |
Christoph Hellwig | 5 | 4.72% | 2 | 14.29% |
Deepa Dinamani | 4 | 3.77% | 1 | 7.14% |
David Howells | 3 | 2.83% | 1 | 7.14% |
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;
d_instantiate_new(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 |
Linus Torvalds (pre-git) | 89 | 43.63% | 10 | 47.62% |
Linus Torvalds | 57 | 27.94% | 1 | 4.76% |
Andrew Morton | 21 | 10.29% | 1 | 4.76% |
Al Viro | 13 | 6.37% | 4 | 19.05% |
Jan Kara | 9 | 4.41% | 1 | 4.76% |
Christoph Hellwig | 5 | 2.45% | 2 | 9.52% |
Eric Paris | 5 | 2.45% | 1 | 4.76% |
Alexey Dobriyan | 5 | 2.45% | 1 | 4.76% |
Total | 204 | 100.00% | 21 | 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 | 67 | 55.37% | 1 | 9.09% |
Linus Torvalds (pre-git) | 26 | 21.49% | 4 | 36.36% |
Jan Kara | 16 | 13.22% | 1 | 9.09% |
Christoph Hellwig | 5 | 4.13% | 2 | 18.18% |
Al Viro | 3 | 2.48% | 1 | 9.09% |
David Howells | 3 | 2.48% | 1 | 9.09% |
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 |
Linus Torvalds (pre-git) | 56 | 73.68% | 7 | 70.00% |
Linus Torvalds | 15 | 19.74% | 1 | 10.00% |
David Howells | 3 | 3.95% | 1 | 10.00% |
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 |
Linus Torvalds (pre-git) | 175 | 42.79% | 19 | 55.88% |
Linus Torvalds | 122 | 29.83% | 1 | 2.94% |
Jan Kara | 35 | 8.56% | 2 | 5.88% |
Miklos Szeredi | 15 | 3.67% | 1 | 2.94% |
Nico Pitre | 12 | 2.93% | 1 | 2.94% |
Christoph Hellwig | 10 | 2.44% | 2 | 5.88% |
Deepa Dinamani | 8 | 1.96% | 1 | 2.94% |
Al Viro | 6 | 1.47% | 1 | 2.94% |
Joshua Hunt | 6 | 1.47% | 1 | 2.94% |
David Howells | 6 | 1.47% | 1 | 2.94% |
Andrew Morton | 5 | 1.22% | 1 | 2.94% |
Alexey Dobriyan | 3 | 0.73% | 1 | 2.94% |
Dave Hansen | 3 | 0.73% | 1 | 2.94% |
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 |
Linus Torvalds (pre-git) | 603 | 32.72% | 31 | 36.05% |
Linus Torvalds | 543 | 29.46% | 3 | 3.49% |
Al Viro | 196 | 10.63% | 16 | 18.60% |
Jan Kara | 99 | 5.37% | 2 | 2.33% |
Christoph Hellwig | 71 | 3.85% | 5 | 5.81% |
Andrew Morton | 68 | 3.69% | 5 | 5.81% |
Theodore Y. Ts'o | 54 | 2.93% | 2 | 2.33% |
Neil Brown | 51 | 2.77% | 1 | 1.16% |
Bryan Donlan | 27 | 1.47% | 1 | 1.16% |
David Howells | 21 | 1.14% | 2 | 2.33% |
Eric Paris | 20 | 1.09% | 1 | 1.16% |
Miklos Szeredi | 15 | 0.81% | 1 | 1.16% |
Alexey Dobriyan | 14 | 0.76% | 1 | 1.16% |
Deepa Dinamani | 12 | 0.65% | 1 | 1.16% |
Nico Pitre | 12 | 0.65% | 1 | 1.16% |
James Morris | 10 | 0.54% | 1 | 1.16% |
Joshua Hunt | 6 | 0.33% | 1 | 1.16% |
Heiko Carstens | 4 | 0.22% | 1 | 1.16% |
Dave Hansen | 3 | 0.16% | 1 | 1.16% |
Kirill A. Shutemov | 3 | 0.16% | 1 | 1.16% |
Trond Myklebust | 2 | 0.11% | 2 | 2.33% |
Arjan van de Ven | 2 | 0.11% | 1 | 1.16% |
Carsten Otte | 2 | 0.11% | 1 | 1.16% |
Dan J Williams | 2 | 0.11% | 1 | 1.16% |
Maximilian Attems | 1 | 0.05% | 1 | 1.16% |
Greg Kroah-Hartman | 1 | 0.05% | 1 | 1.16% |
Andries E. Brouwer | 1 | 0.05% | 1 | 1.16% |
Total | 1843 | 100.00% | 86 | 100.00% |
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