cregit-Linux how code gets into the kernel

Release 4.17 fs/ext2/namei.c

Directory: fs/ext2
// 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

PersonTokensPropCommitsCommitProp
Linus Torvalds2845.16%111.11%
Linus Torvalds (pre-git)2133.87%444.44%
Al Viro1219.35%333.33%
Alexey Dobriyan11.61%111.11%
Total62100.00%9100.00%

/* * 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

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)4233.87%325.00%
Linus Torvalds3225.81%18.33%
Bryan Donlan2721.77%18.33%
Al Viro97.26%325.00%
Neil Brown86.45%18.33%
Heiko Carstens43.23%18.33%
Trond Myklebust10.81%18.33%
David Howells10.81%18.33%
Total124100.00%12100.00%


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

PersonTokensPropCommitsCommitProp
Neil Brown4368.25%114.29%
Al Viro812.70%228.57%
David Howells57.94%228.57%
Linus Torvalds46.35%114.29%
Christoph Hellwig34.76%114.29%
Total63100.00%7100.00%

/* * 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

PersonTokensPropCommitsCommitProp
Linus Torvalds2932.58%17.14%
Linus Torvalds (pre-git)1921.35%321.43%
Christoph Hellwig1617.98%214.29%
Jan Kara1213.48%17.14%
Eric Paris55.62%17.14%
Al Viro33.37%214.29%
Carsten Otte22.25%17.14%
Dan J Williams11.12%17.14%
Andrew Morton11.12%17.14%
Trond Myklebust11.12%17.14%
Total89100.00%14100.00%


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

PersonTokensPropCommitsCommitProp
Al Viro7098.59%150.00%
Dan J Williams11.41%150.00%
Total71100.00%2100.00%


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

PersonTokensPropCommitsCommitProp
Linus Torvalds4942.61%18.33%
Linus Torvalds (pre-git)2118.26%216.67%
Theodore Y. Ts'o1412.17%18.33%
Al Viro108.70%216.67%
Jan Kara97.83%18.33%
Eric Paris54.35%18.33%
Christoph Hellwig54.35%216.67%
Andries E. Brouwer10.87%18.33%
Andrew Morton10.87%18.33%
Total115100.00%12100.00%


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

PersonTokensPropCommitsCommitProp
Linus Torvalds12245.19%28.70%
Linus Torvalds (pre-git)8531.48%1043.48%
Andrew Morton228.15%28.70%
Al Viro207.41%313.04%
Jan Kara93.33%14.35%
Eric Paris51.85%14.35%
Christoph Hellwig51.85%28.70%
Theodore Y. Ts'o10.37%14.35%
Alexey Dobriyan10.37%14.35%
Total270100.00%23100.00%


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

PersonTokensPropCommitsCommitProp
Al Viro3734.91%214.29%
Linus Torvalds (pre-git)3230.19%535.71%
Linus Torvalds1514.15%17.14%
Jan Kara98.49%17.14%
Christoph Hellwig54.72%214.29%
Deepa Dinamani43.77%17.14%
David Howells32.83%17.14%
Alexey Dobriyan10.94%17.14%
Total106100.00%14100.00%


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

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)8943.63%1047.62%
Linus Torvalds5727.94%14.76%
Andrew Morton2110.29%14.76%
Al Viro136.37%419.05%
Jan Kara94.41%14.76%
Christoph Hellwig52.45%29.52%
Eric Paris52.45%14.76%
Alexey Dobriyan52.45%14.76%
Total204100.00%21100.00%


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

PersonTokensPropCommitsCommitProp
Linus Torvalds6755.37%19.09%
Linus Torvalds (pre-git)2621.49%436.36%
Jan Kara1613.22%19.09%
Christoph Hellwig54.13%218.18%
Al Viro32.48%19.09%
David Howells32.48%19.09%
Alexey Dobriyan10.83%19.09%
Total121100.00%11100.00%


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

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)5673.68%770.00%
Linus Torvalds1519.74%110.00%
David Howells33.95%110.00%
Alexey Dobriyan22.63%110.00%
Total76100.00%10100.00%


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

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)17542.79%1955.88%
Linus Torvalds12229.83%12.94%
Jan Kara358.56%25.88%
Miklos Szeredi153.67%12.94%
Nico Pitre122.93%12.94%
Christoph Hellwig102.44%25.88%
Deepa Dinamani81.96%12.94%
Al Viro61.47%12.94%
Joshua Hunt61.47%12.94%
David Howells61.47%12.94%
Andrew Morton51.22%12.94%
Alexey Dobriyan30.73%12.94%
Dave Hansen30.73%12.94%
Kirill A. Shutemov30.73%12.94%
Total409100.00%34100.00%

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

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)60332.72%3136.05%
Linus Torvalds54329.46%33.49%
Al Viro19610.63%1618.60%
Jan Kara995.37%22.33%
Christoph Hellwig713.85%55.81%
Andrew Morton683.69%55.81%
Theodore Y. Ts'o542.93%22.33%
Neil Brown512.77%11.16%
Bryan Donlan271.47%11.16%
David Howells211.14%22.33%
Eric Paris201.09%11.16%
Miklos Szeredi150.81%11.16%
Alexey Dobriyan140.76%11.16%
Deepa Dinamani120.65%11.16%
Nico Pitre120.65%11.16%
James Morris100.54%11.16%
Joshua Hunt60.33%11.16%
Heiko Carstens40.22%11.16%
Dave Hansen30.16%11.16%
Kirill A. Shutemov30.16%11.16%
Trond Myklebust20.11%22.33%
Arjan van de Ven20.11%11.16%
Carsten Otte20.11%11.16%
Dan J Williams20.11%11.16%
Maximilian Attems10.05%11.16%
Greg Kroah-Hartman10.05%11.16%
Andries E. Brouwer10.05%11.16%
Total1843100.00%86100.00%
Directory: fs/ext2
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.