Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * JFFS2 -- Journalling Flash File System, Version 2. |
| 3 | * |
David Woodhouse | c00c310 | 2007-04-25 14:16:47 +0100 | [diff] [blame] | 4 | * Copyright © 2001-2007 Red Hat, Inc. |
David Woodhouse | 6088c05 | 2010-08-08 14:15:22 +0100 | [diff] [blame] | 5 | * Copyright © 2004-2010 David Woodhouse <dwmw2@infradead.org> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6 | * |
| 7 | * Created by David Woodhouse <dwmw2@infradead.org> |
| 8 | * |
| 9 | * For licensing information, see the file 'LICENCE' in this directory. |
| 10 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | */ |
| 12 | |
Joe Perches | 5a52895 | 2012-02-15 15:56:45 -0800 | [diff] [blame] | 13 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 14 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | #include <linux/kernel.h> |
| 16 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | #include <linux/fs.h> |
| 18 | #include <linux/crc32.h> |
| 19 | #include <linux/jffs2.h> |
David Woodhouse | cbb9a56 | 2006-05-03 13:07:27 +0100 | [diff] [blame] | 20 | #include "jffs2_fs_i.h" |
| 21 | #include "jffs2_fs_sb.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | #include <linux/time.h> |
| 23 | #include "nodelist.h" |
| 24 | |
Al Viro | 0312fa7 | 2013-05-17 18:08:49 -0400 | [diff] [blame] | 25 | static int jffs2_readdir (struct file *, struct dir_context *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | |
Al Viro | 4acdaf2 | 2011-07-26 01:42:34 -0400 | [diff] [blame] | 27 | static int jffs2_create (struct inode *,struct dentry *,umode_t, |
Al Viro | ebfc3b4 | 2012-06-10 18:05:36 -0400 | [diff] [blame] | 28 | bool); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | static struct dentry *jffs2_lookup (struct inode *,struct dentry *, |
Al Viro | 00cd8dd | 2012-06-10 17:13:09 -0400 | [diff] [blame] | 30 | unsigned int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | static int jffs2_link (struct dentry *,struct inode *,struct dentry *); |
| 32 | static int jffs2_unlink (struct inode *,struct dentry *); |
| 33 | static int jffs2_symlink (struct inode *,struct dentry *,const char *); |
Al Viro | 18bb1db | 2011-07-26 01:41:39 -0400 | [diff] [blame] | 34 | static int jffs2_mkdir (struct inode *,struct dentry *,umode_t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | static int jffs2_rmdir (struct inode *,struct dentry *); |
Al Viro | 1a67aaf | 2011-07-26 01:52:52 -0400 | [diff] [blame] | 36 | static int jffs2_mknod (struct inode *,struct dentry *,umode_t,dev_t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | static int jffs2_rename (struct inode *, struct dentry *, |
David Woodhouse | ef53cb0 | 2007-07-10 10:01:22 +0100 | [diff] [blame] | 38 | struct inode *, struct dentry *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 40 | const struct file_operations jffs2_dir_operations = |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | { |
| 42 | .read = generic_read_dir, |
Al Viro | c51da20 | 2016-04-30 22:37:34 -0400 | [diff] [blame] | 43 | .iterate_shared=jffs2_readdir, |
Stoyan Gaydarov | 0533400 | 2008-07-07 07:45:59 -0500 | [diff] [blame] | 44 | .unlocked_ioctl=jffs2_ioctl, |
Christoph Hellwig | 3222a3e | 2008-09-03 21:53:01 +0200 | [diff] [blame] | 45 | .fsync = jffs2_fsync, |
| 46 | .llseek = generic_file_llseek, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | }; |
| 48 | |
| 49 | |
Arjan van de Ven | 92e1d5b | 2007-02-12 00:55:39 -0800 | [diff] [blame] | 50 | const struct inode_operations jffs2_dir_inode_operations = |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | { |
David Woodhouse | 265489f | 2005-07-06 13:13:13 +0100 | [diff] [blame] | 52 | .create = jffs2_create, |
| 53 | .lookup = jffs2_lookup, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | .link = jffs2_link, |
| 55 | .unlink = jffs2_unlink, |
| 56 | .symlink = jffs2_symlink, |
| 57 | .mkdir = jffs2_mkdir, |
| 58 | .rmdir = jffs2_rmdir, |
| 59 | .mknod = jffs2_mknod, |
| 60 | .rename = jffs2_rename, |
Christoph Hellwig | 4e34e71 | 2011-07-23 17:37:31 +0200 | [diff] [blame] | 61 | .get_acl = jffs2_get_acl, |
Christoph Hellwig | f2963d4 | 2013-12-20 05:16:47 -0800 | [diff] [blame] | 62 | .set_acl = jffs2_set_acl, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | .setattr = jffs2_setattr, |
KaiGai Kohei | aa98d7c | 2006-05-13 15:09:47 +0900 | [diff] [blame] | 64 | .listxattr = jffs2_listxattr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | }; |
| 66 | |
| 67 | /***********************************************************************/ |
| 68 | |
| 69 | |
| 70 | /* We keep the dirent list sorted in increasing order of name hash, |
Thomas Gleixner | 182ec4e | 2005-11-07 11:16:07 +0000 | [diff] [blame] | 71 | and we use the same hash function as the dentries. Makes this |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | nice and simple |
| 73 | */ |
| 74 | static struct dentry *jffs2_lookup(struct inode *dir_i, struct dentry *target, |
Al Viro | 00cd8dd | 2012-06-10 17:13:09 -0400 | [diff] [blame] | 75 | unsigned int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | { |
| 77 | struct jffs2_inode_info *dir_f; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | struct jffs2_full_dirent *fd = NULL, *fd_list; |
| 79 | uint32_t ino = 0; |
| 80 | struct inode *inode = NULL; |
Linus Torvalds | 8387ff2 | 2016-06-10 07:51:30 -0700 | [diff] [blame] | 81 | unsigned int nhash; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | |
Joe Perches | 9c261b3 | 2012-02-15 15:56:43 -0800 | [diff] [blame] | 83 | jffs2_dbg(1, "jffs2_lookup()\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | |
Richard Purdie | 373d5e7 | 2006-04-18 02:05:46 +0100 | [diff] [blame] | 85 | if (target->d_name.len > JFFS2_MAX_NAME_LEN) |
| 86 | return ERR_PTR(-ENAMETOOLONG); |
| 87 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | dir_f = JFFS2_INODE_INFO(dir_i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | |
Linus Torvalds | 8387ff2 | 2016-06-10 07:51:30 -0700 | [diff] [blame] | 90 | /* The 'nhash' on the fd_list is not the same as the dentry hash */ |
| 91 | nhash = full_name_hash(NULL, target->d_name.name, target->d_name.len); |
| 92 | |
David Woodhouse | ced2207 | 2008-04-22 15:13:40 +0100 | [diff] [blame] | 93 | mutex_lock(&dir_f->sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | |
| 95 | /* NB: The 2.2 backport will need to explicitly check for '.' and '..' here */ |
Linus Torvalds | 8387ff2 | 2016-06-10 07:51:30 -0700 | [diff] [blame] | 96 | for (fd_list = dir_f->dents; fd_list && fd_list->nhash <= nhash; fd_list = fd_list->next) { |
| 97 | if (fd_list->nhash == nhash && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | (!fd || fd_list->version > fd->version) && |
| 99 | strlen(fd_list->name) == target->d_name.len && |
| 100 | !strncmp(fd_list->name, target->d_name.name, target->d_name.len)) { |
| 101 | fd = fd_list; |
| 102 | } |
| 103 | } |
| 104 | if (fd) |
| 105 | ino = fd->ino; |
David Woodhouse | ced2207 | 2008-04-22 15:13:40 +0100 | [diff] [blame] | 106 | mutex_unlock(&dir_f->sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | if (ino) { |
David Howells | 5451f79 | 2008-02-07 00:15:42 -0800 | [diff] [blame] | 108 | inode = jffs2_iget(dir_i->i_sb, ino); |
Al Viro | a904937 | 2011-07-08 21:20:11 -0400 | [diff] [blame] | 109 | if (IS_ERR(inode)) |
Joe Perches | da320f0 | 2012-02-15 15:56:44 -0800 | [diff] [blame] | 110 | pr_warn("iget() failed for ino #%u\n", ino); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | } |
| 112 | |
David Woodhouse | 8966c5e | 2008-08-18 15:36:47 +0100 | [diff] [blame] | 113 | return d_splice_alias(inode, target); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | } |
| 115 | |
| 116 | /***********************************************************************/ |
| 117 | |
| 118 | |
Al Viro | 0312fa7 | 2013-05-17 18:08:49 -0400 | [diff] [blame] | 119 | static int jffs2_readdir(struct file *file, struct dir_context *ctx) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | { |
Al Viro | 0312fa7 | 2013-05-17 18:08:49 -0400 | [diff] [blame] | 121 | struct inode *inode = file_inode(file); |
| 122 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | struct jffs2_full_dirent *fd; |
Al Viro | 0312fa7 | 2013-05-17 18:08:49 -0400 | [diff] [blame] | 124 | unsigned long curofs = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | |
Al Viro | 0312fa7 | 2013-05-17 18:08:49 -0400 | [diff] [blame] | 126 | jffs2_dbg(1, "jffs2_readdir() for dir_i #%lu\n", inode->i_ino); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | |
Al Viro | 0312fa7 | 2013-05-17 18:08:49 -0400 | [diff] [blame] | 128 | if (!dir_emit_dots(file, ctx)) |
| 129 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | |
David Woodhouse | ced2207 | 2008-04-22 15:13:40 +0100 | [diff] [blame] | 131 | mutex_lock(&f->sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | for (fd = f->dents; fd; fd = fd->next) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | curofs++; |
Al Viro | 0312fa7 | 2013-05-17 18:08:49 -0400 | [diff] [blame] | 134 | /* First loop: curofs = 2; pos = 2 */ |
| 135 | if (curofs < ctx->pos) { |
Joe Perches | 9c261b3 | 2012-02-15 15:56:43 -0800 | [diff] [blame] | 136 | jffs2_dbg(2, "Skipping dirent: \"%s\", ino #%u, type %d, because curofs %ld < offset %ld\n", |
Al Viro | 0312fa7 | 2013-05-17 18:08:49 -0400 | [diff] [blame] | 137 | fd->name, fd->ino, fd->type, curofs, (unsigned long)ctx->pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | continue; |
| 139 | } |
| 140 | if (!fd->ino) { |
Joe Perches | 9c261b3 | 2012-02-15 15:56:43 -0800 | [diff] [blame] | 141 | jffs2_dbg(2, "Skipping deletion dirent \"%s\"\n", |
| 142 | fd->name); |
Al Viro | 0312fa7 | 2013-05-17 18:08:49 -0400 | [diff] [blame] | 143 | ctx->pos++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | continue; |
| 145 | } |
Joe Perches | 9c261b3 | 2012-02-15 15:56:43 -0800 | [diff] [blame] | 146 | jffs2_dbg(2, "Dirent %ld: \"%s\", ino #%u, type %d\n", |
Al Viro | 0312fa7 | 2013-05-17 18:08:49 -0400 | [diff] [blame] | 147 | (unsigned long)ctx->pos, fd->name, fd->ino, fd->type); |
| 148 | if (!dir_emit(ctx, fd->name, strlen(fd->name), fd->ino, fd->type)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | break; |
Al Viro | 0312fa7 | 2013-05-17 18:08:49 -0400 | [diff] [blame] | 150 | ctx->pos++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | } |
David Woodhouse | ced2207 | 2008-04-22 15:13:40 +0100 | [diff] [blame] | 152 | mutex_unlock(&f->sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | return 0; |
| 154 | } |
| 155 | |
| 156 | /***********************************************************************/ |
| 157 | |
| 158 | |
Al Viro | 4acdaf2 | 2011-07-26 01:42:34 -0400 | [diff] [blame] | 159 | static int jffs2_create(struct inode *dir_i, struct dentry *dentry, |
Al Viro | ebfc3b4 | 2012-06-10 18:05:36 -0400 | [diff] [blame] | 160 | umode_t mode, bool excl) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | { |
| 162 | struct jffs2_raw_inode *ri; |
| 163 | struct jffs2_inode_info *f, *dir_f; |
| 164 | struct jffs2_sb_info *c; |
| 165 | struct inode *inode; |
| 166 | int ret; |
| 167 | |
| 168 | ri = jffs2_alloc_raw_inode(); |
| 169 | if (!ri) |
| 170 | return -ENOMEM; |
Thomas Gleixner | 182ec4e | 2005-11-07 11:16:07 +0000 | [diff] [blame] | 171 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | c = JFFS2_SB_INFO(dir_i->i_sb); |
| 173 | |
Joe Perches | 9c261b3 | 2012-02-15 15:56:43 -0800 | [diff] [blame] | 174 | jffs2_dbg(1, "%s()\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | |
KaiGai Kohei | cfc8dc6 | 2007-09-14 15:16:35 +0900 | [diff] [blame] | 176 | inode = jffs2_new_inode(dir_i, mode, ri); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | |
| 178 | if (IS_ERR(inode)) { |
Joe Perches | 9c261b3 | 2012-02-15 15:56:43 -0800 | [diff] [blame] | 179 | jffs2_dbg(1, "jffs2_new_inode() failed\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | jffs2_free_raw_inode(ri); |
| 181 | return PTR_ERR(inode); |
| 182 | } |
| 183 | |
| 184 | inode->i_op = &jffs2_file_inode_operations; |
| 185 | inode->i_fop = &jffs2_file_operations; |
| 186 | inode->i_mapping->a_ops = &jffs2_file_address_operations; |
| 187 | inode->i_mapping->nrpages = 0; |
| 188 | |
| 189 | f = JFFS2_INODE_INFO(inode); |
| 190 | dir_f = JFFS2_INODE_INFO(dir_i); |
| 191 | |
David Woodhouse | 590fe34 | 2008-05-01 15:53:28 +0100 | [diff] [blame] | 192 | /* jffs2_do_create() will want to lock it, _after_ reserving |
| 193 | space and taking c-alloc_sem. If we keep it locked here, |
| 194 | lockdep gets unhappy (although it's a false positive; |
| 195 | nothing else will be looking at this inode yet so there's |
| 196 | no chance of AB-BA deadlock involving its f->sem). */ |
| 197 | mutex_unlock(&f->sem); |
| 198 | |
Eric Paris | 2a7dba3 | 2011-02-01 11:05:39 -0500 | [diff] [blame] | 199 | ret = jffs2_do_create(c, dir_f, f, ri, &dentry->d_name); |
KaiGai Kohei | aa98d7c | 2006-05-13 15:09:47 +0900 | [diff] [blame] | 200 | if (ret) |
| 201 | goto fail; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | |
| 203 | dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime)); |
| 204 | |
| 205 | jffs2_free_raw_inode(ri); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | |
Joe Perches | 9c261b3 | 2012-02-15 15:56:43 -0800 | [diff] [blame] | 207 | jffs2_dbg(1, "%s(): Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n", |
| 208 | __func__, inode->i_ino, inode->i_mode, inode->i_nlink, |
| 209 | f->inocache->pino_nlink, inode->i_mapping->nrpages); |
David Woodhouse | e72e649 | 2010-06-03 08:09:12 +0100 | [diff] [blame] | 210 | |
David Woodhouse | e72e649 | 2010-06-03 08:09:12 +0100 | [diff] [blame] | 211 | unlock_new_inode(inode); |
Al Viro | 8fc37ec | 2012-07-19 09:18:15 +0400 | [diff] [blame] | 212 | d_instantiate(dentry, inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | return 0; |
KaiGai Kohei | aa98d7c | 2006-05-13 15:09:47 +0900 | [diff] [blame] | 214 | |
| 215 | fail: |
Al Viro | 41cce64 | 2010-06-08 13:24:56 -0400 | [diff] [blame] | 216 | iget_failed(inode); |
KaiGai Kohei | aa98d7c | 2006-05-13 15:09:47 +0900 | [diff] [blame] | 217 | jffs2_free_raw_inode(ri); |
| 218 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | } |
| 220 | |
| 221 | /***********************************************************************/ |
| 222 | |
| 223 | |
| 224 | static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry) |
| 225 | { |
| 226 | struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb); |
| 227 | struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 228 | struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(d_inode(dentry)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | int ret; |
Artem B. Bityutskiy | 3a69e0c | 2005-08-17 14:46:26 +0100 | [diff] [blame] | 230 | uint32_t now = get_seconds(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | |
Thomas Gleixner | 182ec4e | 2005-11-07 11:16:07 +0000 | [diff] [blame] | 232 | ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name, |
Artem B. Bityutskiy | 3a69e0c | 2005-08-17 14:46:26 +0100 | [diff] [blame] | 233 | dentry->d_name.len, dead_f, now); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 234 | if (dead_f->inocache) |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 235 | set_nlink(d_inode(dentry), dead_f->inocache->pino_nlink); |
Artem B. Bityutskiy | 3a69e0c | 2005-08-17 14:46:26 +0100 | [diff] [blame] | 236 | if (!ret) |
| 237 | dir_i->i_mtime = dir_i->i_ctime = ITIME(now); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | return ret; |
| 239 | } |
| 240 | /***********************************************************************/ |
| 241 | |
| 242 | |
| 243 | static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry) |
| 244 | { |
Al Viro | fc64005 | 2016-04-10 01:33:30 -0400 | [diff] [blame] | 245 | struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_sb); |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 246 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(d_inode(old_dentry)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); |
| 248 | int ret; |
| 249 | uint8_t type; |
Artem B. Bityutskiy | 3a69e0c | 2005-08-17 14:46:26 +0100 | [diff] [blame] | 250 | uint32_t now; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | |
| 252 | /* Don't let people make hard links to bad inodes. */ |
| 253 | if (!f->inocache) |
| 254 | return -EIO; |
| 255 | |
David Howells | e36cb0b | 2015-01-29 12:02:35 +0000 | [diff] [blame] | 256 | if (d_is_dir(old_dentry)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | return -EPERM; |
| 258 | |
| 259 | /* XXX: This is ugly */ |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 260 | type = (d_inode(old_dentry)->i_mode & S_IFMT) >> 12; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | if (!type) type = DT_REG; |
| 262 | |
Artem B. Bityutskiy | 3a69e0c | 2005-08-17 14:46:26 +0100 | [diff] [blame] | 263 | now = get_seconds(); |
| 264 | ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len, now); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | |
| 266 | if (!ret) { |
David Woodhouse | ced2207 | 2008-04-22 15:13:40 +0100 | [diff] [blame] | 267 | mutex_lock(&f->sem); |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 268 | set_nlink(d_inode(old_dentry), ++f->inocache->pino_nlink); |
David Woodhouse | ced2207 | 2008-04-22 15:13:40 +0100 | [diff] [blame] | 269 | mutex_unlock(&f->sem); |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 270 | d_instantiate(dentry, d_inode(old_dentry)); |
Artem B. Bityutskiy | 3a69e0c | 2005-08-17 14:46:26 +0100 | [diff] [blame] | 271 | dir_i->i_mtime = dir_i->i_ctime = ITIME(now); |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 272 | ihold(d_inode(old_dentry)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 273 | } |
| 274 | return ret; |
| 275 | } |
| 276 | |
| 277 | /***********************************************************************/ |
| 278 | |
| 279 | static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target) |
| 280 | { |
| 281 | struct jffs2_inode_info *f, *dir_f; |
| 282 | struct jffs2_sb_info *c; |
| 283 | struct inode *inode; |
| 284 | struct jffs2_raw_inode *ri; |
| 285 | struct jffs2_raw_dirent *rd; |
| 286 | struct jffs2_full_dnode *fn; |
| 287 | struct jffs2_full_dirent *fd; |
| 288 | int namelen; |
David Woodhouse | 9fe4854 | 2006-05-23 00:38:06 +0100 | [diff] [blame] | 289 | uint32_t alloclen; |
Artem B. Bityuckiy | 32f1a95 | 2005-03-01 10:50:52 +0000 | [diff] [blame] | 290 | int ret, targetlen = strlen(target); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | |
| 292 | /* FIXME: If you care. We'd need to use frags for the target |
| 293 | if it grows much more than this */ |
Artem B. Bityuckiy | 32f1a95 | 2005-03-01 10:50:52 +0000 | [diff] [blame] | 294 | if (targetlen > 254) |
Adrian Hunter | bde86fe | 2008-08-14 11:57:45 +0300 | [diff] [blame] | 295 | return -ENAMETOOLONG; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | |
| 297 | ri = jffs2_alloc_raw_inode(); |
| 298 | |
| 299 | if (!ri) |
| 300 | return -ENOMEM; |
Thomas Gleixner | 182ec4e | 2005-11-07 11:16:07 +0000 | [diff] [blame] | 301 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | c = JFFS2_SB_INFO(dir_i->i_sb); |
Thomas Gleixner | 182ec4e | 2005-11-07 11:16:07 +0000 | [diff] [blame] | 303 | |
| 304 | /* Try to reserve enough space for both node and dirent. |
| 305 | * Just the node will do for now, though |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 306 | */ |
| 307 | namelen = dentry->d_name.len; |
David Woodhouse | 9fe4854 | 2006-05-23 00:38:06 +0100 | [diff] [blame] | 308 | ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &alloclen, |
| 309 | ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | |
| 311 | if (ret) { |
| 312 | jffs2_free_raw_inode(ri); |
| 313 | return ret; |
| 314 | } |
| 315 | |
KaiGai Kohei | cfc8dc6 | 2007-09-14 15:16:35 +0900 | [diff] [blame] | 316 | inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | |
| 318 | if (IS_ERR(inode)) { |
| 319 | jffs2_free_raw_inode(ri); |
| 320 | jffs2_complete_reservation(c); |
| 321 | return PTR_ERR(inode); |
| 322 | } |
| 323 | |
| 324 | inode->i_op = &jffs2_symlink_inode_operations; |
| 325 | |
| 326 | f = JFFS2_INODE_INFO(inode); |
| 327 | |
Artem B. Bityuckiy | 32f1a95 | 2005-03-01 10:50:52 +0000 | [diff] [blame] | 328 | inode->i_size = targetlen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size); |
| 330 | ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size); |
| 331 | ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); |
| 332 | |
| 333 | ri->compr = JFFS2_COMPR_NONE; |
Artem B. Bityuckiy | 32f1a95 | 2005-03-01 10:50:52 +0000 | [diff] [blame] | 334 | ri->data_crc = cpu_to_je32(crc32(0, target, targetlen)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); |
Thomas Gleixner | 182ec4e | 2005-11-07 11:16:07 +0000 | [diff] [blame] | 336 | |
David Woodhouse | 9fe4854 | 2006-05-23 00:38:06 +0100 | [diff] [blame] | 337 | fn = jffs2_write_dnode(c, f, ri, target, targetlen, ALLOC_NORMAL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 338 | |
| 339 | jffs2_free_raw_inode(ri); |
| 340 | |
| 341 | if (IS_ERR(fn)) { |
| 342 | /* Eeek. Wave bye bye */ |
David Woodhouse | ced2207 | 2008-04-22 15:13:40 +0100 | [diff] [blame] | 343 | mutex_unlock(&f->sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | jffs2_complete_reservation(c); |
David Woodhouse | f324e4c | 2010-06-03 08:03:39 +0100 | [diff] [blame] | 345 | ret = PTR_ERR(fn); |
| 346 | goto fail; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | } |
Artem B. Bityuckiy | 32f1a95 | 2005-03-01 10:50:52 +0000 | [diff] [blame] | 348 | |
Artem B. Bityutskiy | 2b79adc | 2005-07-17 12:13:51 +0100 | [diff] [blame] | 349 | /* We use f->target field to store the target path. */ |
Julia Lawall | 04aadf3 | 2010-10-17 21:56:15 +0200 | [diff] [blame] | 350 | f->target = kmemdup(target, targetlen + 1, GFP_KERNEL); |
Artem B. Bityutskiy | 2b79adc | 2005-07-17 12:13:51 +0100 | [diff] [blame] | 351 | if (!f->target) { |
Joe Perches | da320f0 | 2012-02-15 15:56:44 -0800 | [diff] [blame] | 352 | pr_warn("Can't allocate %d bytes of memory\n", targetlen + 1); |
David Woodhouse | ced2207 | 2008-04-22 15:13:40 +0100 | [diff] [blame] | 353 | mutex_unlock(&f->sem); |
Artem B. Bityuckiy | 32f1a95 | 2005-03-01 10:50:52 +0000 | [diff] [blame] | 354 | jffs2_complete_reservation(c); |
David Woodhouse | f324e4c | 2010-06-03 08:03:39 +0100 | [diff] [blame] | 355 | ret = -ENOMEM; |
| 356 | goto fail; |
Artem B. Bityuckiy | 32f1a95 | 2005-03-01 10:50:52 +0000 | [diff] [blame] | 357 | } |
Al Viro | a8db149 | 2015-05-02 10:21:20 -0400 | [diff] [blame] | 358 | inode->i_link = f->target; |
Artem B. Bityuckiy | 32f1a95 | 2005-03-01 10:50:52 +0000 | [diff] [blame] | 359 | |
Joe Perches | 9c261b3 | 2012-02-15 15:56:43 -0800 | [diff] [blame] | 360 | jffs2_dbg(1, "%s(): symlink's target '%s' cached\n", |
| 361 | __func__, (char *)f->target); |
Artem B. Bityuckiy | 32f1a95 | 2005-03-01 10:50:52 +0000 | [diff] [blame] | 362 | |
Thomas Gleixner | 182ec4e | 2005-11-07 11:16:07 +0000 | [diff] [blame] | 363 | /* No data here. Only a metadata node, which will be |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 364 | obsoleted by the first data write |
| 365 | */ |
| 366 | f->metadata = fn; |
David Woodhouse | ced2207 | 2008-04-22 15:13:40 +0100 | [diff] [blame] | 367 | mutex_unlock(&f->sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | |
| 369 | jffs2_complete_reservation(c); |
KaiGai Kohei | aa98d7c | 2006-05-13 15:09:47 +0900 | [diff] [blame] | 370 | |
Eric Paris | 2a7dba3 | 2011-02-01 11:05:39 -0500 | [diff] [blame] | 371 | ret = jffs2_init_security(inode, dir_i, &dentry->d_name); |
David Woodhouse | f324e4c | 2010-06-03 08:03:39 +0100 | [diff] [blame] | 372 | if (ret) |
| 373 | goto fail; |
| 374 | |
KaiGai Kohei | cfc8dc6 | 2007-09-14 15:16:35 +0900 | [diff] [blame] | 375 | ret = jffs2_init_acl_post(inode); |
David Woodhouse | f324e4c | 2010-06-03 08:03:39 +0100 | [diff] [blame] | 376 | if (ret) |
| 377 | goto fail; |
KaiGai Kohei | aa98d7c | 2006-05-13 15:09:47 +0900 | [diff] [blame] | 378 | |
David Woodhouse | 9fe4854 | 2006-05-23 00:38:06 +0100 | [diff] [blame] | 379 | ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, |
| 380 | ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); |
David Woodhouse | f324e4c | 2010-06-03 08:03:39 +0100 | [diff] [blame] | 381 | if (ret) |
| 382 | goto fail; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | |
| 384 | rd = jffs2_alloc_raw_dirent(); |
| 385 | if (!rd) { |
| 386 | /* Argh. Now we treat it like a normal delete */ |
| 387 | jffs2_complete_reservation(c); |
David Woodhouse | f324e4c | 2010-06-03 08:03:39 +0100 | [diff] [blame] | 388 | ret = -ENOMEM; |
| 389 | goto fail; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | } |
| 391 | |
| 392 | dir_f = JFFS2_INODE_INFO(dir_i); |
David Woodhouse | ced2207 | 2008-04-22 15:13:40 +0100 | [diff] [blame] | 393 | mutex_lock(&dir_f->sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | |
| 395 | rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); |
| 396 | rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); |
| 397 | rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); |
| 398 | rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); |
| 399 | |
| 400 | rd->pino = cpu_to_je32(dir_i->i_ino); |
| 401 | rd->version = cpu_to_je32(++dir_f->highest_version); |
| 402 | rd->ino = cpu_to_je32(inode->i_ino); |
| 403 | rd->mctime = cpu_to_je32(get_seconds()); |
| 404 | rd->nsize = namelen; |
| 405 | rd->type = DT_LNK; |
| 406 | rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); |
| 407 | rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); |
| 408 | |
David Woodhouse | 9fe4854 | 2006-05-23 00:38:06 +0100 | [diff] [blame] | 409 | fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 410 | |
| 411 | if (IS_ERR(fd)) { |
Thomas Gleixner | 182ec4e | 2005-11-07 11:16:07 +0000 | [diff] [blame] | 412 | /* dirent failed to write. Delete the inode normally |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | as if it were the final unlink() */ |
| 414 | jffs2_complete_reservation(c); |
| 415 | jffs2_free_raw_dirent(rd); |
David Woodhouse | ced2207 | 2008-04-22 15:13:40 +0100 | [diff] [blame] | 416 | mutex_unlock(&dir_f->sem); |
David Woodhouse | f324e4c | 2010-06-03 08:03:39 +0100 | [diff] [blame] | 417 | ret = PTR_ERR(fd); |
| 418 | goto fail; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | } |
| 420 | |
| 421 | dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); |
| 422 | |
| 423 | jffs2_free_raw_dirent(rd); |
| 424 | |
| 425 | /* Link the fd into the inode's list, obsoleting an old |
| 426 | one if necessary. */ |
| 427 | jffs2_add_fd_to_list(c, fd, &dir_f->dents); |
| 428 | |
David Woodhouse | ced2207 | 2008-04-22 15:13:40 +0100 | [diff] [blame] | 429 | mutex_unlock(&dir_f->sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | jffs2_complete_reservation(c); |
| 431 | |
David Woodhouse | e72e649 | 2010-06-03 08:09:12 +0100 | [diff] [blame] | 432 | unlock_new_inode(inode); |
Al Viro | 8fc37ec | 2012-07-19 09:18:15 +0400 | [diff] [blame] | 433 | d_instantiate(dentry, inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | return 0; |
David Woodhouse | f324e4c | 2010-06-03 08:03:39 +0100 | [diff] [blame] | 435 | |
| 436 | fail: |
Al Viro | 41cce64 | 2010-06-08 13:24:56 -0400 | [diff] [blame] | 437 | iget_failed(inode); |
David Woodhouse | f324e4c | 2010-06-03 08:03:39 +0100 | [diff] [blame] | 438 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 439 | } |
| 440 | |
| 441 | |
Al Viro | 18bb1db | 2011-07-26 01:41:39 -0400 | [diff] [blame] | 442 | static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, umode_t mode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | { |
| 444 | struct jffs2_inode_info *f, *dir_f; |
| 445 | struct jffs2_sb_info *c; |
| 446 | struct inode *inode; |
| 447 | struct jffs2_raw_inode *ri; |
| 448 | struct jffs2_raw_dirent *rd; |
| 449 | struct jffs2_full_dnode *fn; |
| 450 | struct jffs2_full_dirent *fd; |
| 451 | int namelen; |
David Woodhouse | 9fe4854 | 2006-05-23 00:38:06 +0100 | [diff] [blame] | 452 | uint32_t alloclen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 453 | int ret; |
| 454 | |
| 455 | mode |= S_IFDIR; |
| 456 | |
| 457 | ri = jffs2_alloc_raw_inode(); |
| 458 | if (!ri) |
| 459 | return -ENOMEM; |
Thomas Gleixner | 182ec4e | 2005-11-07 11:16:07 +0000 | [diff] [blame] | 460 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | c = JFFS2_SB_INFO(dir_i->i_sb); |
| 462 | |
Thomas Gleixner | 182ec4e | 2005-11-07 11:16:07 +0000 | [diff] [blame] | 463 | /* Try to reserve enough space for both node and dirent. |
| 464 | * Just the node will do for now, though |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 465 | */ |
| 466 | namelen = dentry->d_name.len; |
David Woodhouse | 9fe4854 | 2006-05-23 00:38:06 +0100 | [diff] [blame] | 467 | ret = jffs2_reserve_space(c, sizeof(*ri), &alloclen, ALLOC_NORMAL, |
| 468 | JFFS2_SUMMARY_INODE_SIZE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | |
| 470 | if (ret) { |
| 471 | jffs2_free_raw_inode(ri); |
| 472 | return ret; |
| 473 | } |
| 474 | |
KaiGai Kohei | cfc8dc6 | 2007-09-14 15:16:35 +0900 | [diff] [blame] | 475 | inode = jffs2_new_inode(dir_i, mode, ri); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 476 | |
| 477 | if (IS_ERR(inode)) { |
| 478 | jffs2_free_raw_inode(ri); |
| 479 | jffs2_complete_reservation(c); |
| 480 | return PTR_ERR(inode); |
| 481 | } |
| 482 | |
| 483 | inode->i_op = &jffs2_dir_inode_operations; |
| 484 | inode->i_fop = &jffs2_dir_operations; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 485 | |
| 486 | f = JFFS2_INODE_INFO(inode); |
| 487 | |
David Woodhouse | 27c72b0 | 2008-05-01 18:47:17 +0100 | [diff] [blame] | 488 | /* Directories get nlink 2 at start */ |
Miklos Szeredi | bfe8684 | 2011-10-28 14:13:29 +0200 | [diff] [blame] | 489 | set_nlink(inode, 2); |
David Woodhouse | 27c72b0 | 2008-05-01 18:47:17 +0100 | [diff] [blame] | 490 | /* but ic->pino_nlink is the parent ino# */ |
| 491 | f->inocache->pino_nlink = dir_i->i_ino; |
| 492 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 493 | ri->data_crc = cpu_to_je32(0); |
| 494 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); |
Thomas Gleixner | 182ec4e | 2005-11-07 11:16:07 +0000 | [diff] [blame] | 495 | |
David Woodhouse | 9fe4854 | 2006-05-23 00:38:06 +0100 | [diff] [blame] | 496 | fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 497 | |
| 498 | jffs2_free_raw_inode(ri); |
| 499 | |
| 500 | if (IS_ERR(fn)) { |
| 501 | /* Eeek. Wave bye bye */ |
David Woodhouse | ced2207 | 2008-04-22 15:13:40 +0100 | [diff] [blame] | 502 | mutex_unlock(&f->sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 503 | jffs2_complete_reservation(c); |
David Woodhouse | f324e4c | 2010-06-03 08:03:39 +0100 | [diff] [blame] | 504 | ret = PTR_ERR(fn); |
| 505 | goto fail; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | } |
Thomas Gleixner | 182ec4e | 2005-11-07 11:16:07 +0000 | [diff] [blame] | 507 | /* No data here. Only a metadata node, which will be |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | obsoleted by the first data write |
| 509 | */ |
| 510 | f->metadata = fn; |
David Woodhouse | ced2207 | 2008-04-22 15:13:40 +0100 | [diff] [blame] | 511 | mutex_unlock(&f->sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | |
| 513 | jffs2_complete_reservation(c); |
KaiGai Kohei | aa98d7c | 2006-05-13 15:09:47 +0900 | [diff] [blame] | 514 | |
Eric Paris | 2a7dba3 | 2011-02-01 11:05:39 -0500 | [diff] [blame] | 515 | ret = jffs2_init_security(inode, dir_i, &dentry->d_name); |
David Woodhouse | f324e4c | 2010-06-03 08:03:39 +0100 | [diff] [blame] | 516 | if (ret) |
| 517 | goto fail; |
| 518 | |
KaiGai Kohei | cfc8dc6 | 2007-09-14 15:16:35 +0900 | [diff] [blame] | 519 | ret = jffs2_init_acl_post(inode); |
David Woodhouse | f324e4c | 2010-06-03 08:03:39 +0100 | [diff] [blame] | 520 | if (ret) |
| 521 | goto fail; |
KaiGai Kohei | aa98d7c | 2006-05-13 15:09:47 +0900 | [diff] [blame] | 522 | |
David Woodhouse | 9fe4854 | 2006-05-23 00:38:06 +0100 | [diff] [blame] | 523 | ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, |
| 524 | ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); |
David Woodhouse | f324e4c | 2010-06-03 08:03:39 +0100 | [diff] [blame] | 525 | if (ret) |
| 526 | goto fail; |
Thomas Gleixner | 182ec4e | 2005-11-07 11:16:07 +0000 | [diff] [blame] | 527 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | rd = jffs2_alloc_raw_dirent(); |
| 529 | if (!rd) { |
| 530 | /* Argh. Now we treat it like a normal delete */ |
| 531 | jffs2_complete_reservation(c); |
David Woodhouse | f324e4c | 2010-06-03 08:03:39 +0100 | [diff] [blame] | 532 | ret = -ENOMEM; |
| 533 | goto fail; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 534 | } |
| 535 | |
| 536 | dir_f = JFFS2_INODE_INFO(dir_i); |
David Woodhouse | ced2207 | 2008-04-22 15:13:40 +0100 | [diff] [blame] | 537 | mutex_lock(&dir_f->sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | |
| 539 | rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); |
| 540 | rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); |
| 541 | rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); |
| 542 | rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); |
| 543 | |
| 544 | rd->pino = cpu_to_je32(dir_i->i_ino); |
| 545 | rd->version = cpu_to_je32(++dir_f->highest_version); |
| 546 | rd->ino = cpu_to_je32(inode->i_ino); |
| 547 | rd->mctime = cpu_to_je32(get_seconds()); |
| 548 | rd->nsize = namelen; |
| 549 | rd->type = DT_DIR; |
| 550 | rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); |
| 551 | rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); |
| 552 | |
David Woodhouse | 9fe4854 | 2006-05-23 00:38:06 +0100 | [diff] [blame] | 553 | fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); |
Thomas Gleixner | 182ec4e | 2005-11-07 11:16:07 +0000 | [diff] [blame] | 554 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 555 | if (IS_ERR(fd)) { |
Thomas Gleixner | 182ec4e | 2005-11-07 11:16:07 +0000 | [diff] [blame] | 556 | /* dirent failed to write. Delete the inode normally |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 557 | as if it were the final unlink() */ |
| 558 | jffs2_complete_reservation(c); |
| 559 | jffs2_free_raw_dirent(rd); |
David Woodhouse | ced2207 | 2008-04-22 15:13:40 +0100 | [diff] [blame] | 560 | mutex_unlock(&dir_f->sem); |
David Woodhouse | f324e4c | 2010-06-03 08:03:39 +0100 | [diff] [blame] | 561 | ret = PTR_ERR(fd); |
| 562 | goto fail; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 563 | } |
| 564 | |
| 565 | dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); |
Dave Hansen | d8c76e6 | 2006-09-30 23:29:04 -0700 | [diff] [blame] | 566 | inc_nlink(dir_i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | |
| 568 | jffs2_free_raw_dirent(rd); |
| 569 | |
| 570 | /* Link the fd into the inode's list, obsoleting an old |
| 571 | one if necessary. */ |
| 572 | jffs2_add_fd_to_list(c, fd, &dir_f->dents); |
| 573 | |
David Woodhouse | ced2207 | 2008-04-22 15:13:40 +0100 | [diff] [blame] | 574 | mutex_unlock(&dir_f->sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 575 | jffs2_complete_reservation(c); |
| 576 | |
David Woodhouse | e72e649 | 2010-06-03 08:09:12 +0100 | [diff] [blame] | 577 | unlock_new_inode(inode); |
Al Viro | 8fc37ec | 2012-07-19 09:18:15 +0400 | [diff] [blame] | 578 | d_instantiate(dentry, inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 579 | return 0; |
David Woodhouse | f324e4c | 2010-06-03 08:03:39 +0100 | [diff] [blame] | 580 | |
| 581 | fail: |
Al Viro | 41cce64 | 2010-06-08 13:24:56 -0400 | [diff] [blame] | 582 | iget_failed(inode); |
David Woodhouse | f324e4c | 2010-06-03 08:03:39 +0100 | [diff] [blame] | 583 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 584 | } |
| 585 | |
| 586 | static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry) |
| 587 | { |
David Woodhouse | 27c72b0 | 2008-05-01 18:47:17 +0100 | [diff] [blame] | 588 | struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb); |
| 589 | struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 590 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(d_inode(dentry)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 591 | struct jffs2_full_dirent *fd; |
| 592 | int ret; |
David Woodhouse | 27c72b0 | 2008-05-01 18:47:17 +0100 | [diff] [blame] | 593 | uint32_t now = get_seconds(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 594 | |
| 595 | for (fd = f->dents ; fd; fd = fd->next) { |
| 596 | if (fd->ino) |
| 597 | return -ENOTEMPTY; |
| 598 | } |
David Woodhouse | 27c72b0 | 2008-05-01 18:47:17 +0100 | [diff] [blame] | 599 | |
| 600 | ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name, |
| 601 | dentry->d_name.len, f, now); |
| 602 | if (!ret) { |
| 603 | dir_i->i_mtime = dir_i->i_ctime = ITIME(now); |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 604 | clear_nlink(d_inode(dentry)); |
Dave Hansen | 9a53c3a | 2006-09-30 23:29:03 -0700 | [diff] [blame] | 605 | drop_nlink(dir_i); |
David Woodhouse | 27c72b0 | 2008-05-01 18:47:17 +0100 | [diff] [blame] | 606 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 607 | return ret; |
| 608 | } |
| 609 | |
Al Viro | 1a67aaf | 2011-07-26 01:52:52 -0400 | [diff] [blame] | 610 | static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, umode_t mode, dev_t rdev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 611 | { |
| 612 | struct jffs2_inode_info *f, *dir_f; |
| 613 | struct jffs2_sb_info *c; |
| 614 | struct inode *inode; |
| 615 | struct jffs2_raw_inode *ri; |
| 616 | struct jffs2_raw_dirent *rd; |
| 617 | struct jffs2_full_dnode *fn; |
| 618 | struct jffs2_full_dirent *fd; |
| 619 | int namelen; |
David Woodhouse | aef9ab4 | 2006-05-19 00:28:49 +0100 | [diff] [blame] | 620 | union jffs2_device_node dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 621 | int devlen = 0; |
David Woodhouse | 9fe4854 | 2006-05-23 00:38:06 +0100 | [diff] [blame] | 622 | uint32_t alloclen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 623 | int ret; |
| 624 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | ri = jffs2_alloc_raw_inode(); |
| 626 | if (!ri) |
| 627 | return -ENOMEM; |
Thomas Gleixner | 182ec4e | 2005-11-07 11:16:07 +0000 | [diff] [blame] | 628 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 | c = JFFS2_SB_INFO(dir_i->i_sb); |
Thomas Gleixner | 182ec4e | 2005-11-07 11:16:07 +0000 | [diff] [blame] | 630 | |
David Woodhouse | aef9ab4 | 2006-05-19 00:28:49 +0100 | [diff] [blame] | 631 | if (S_ISBLK(mode) || S_ISCHR(mode)) |
| 632 | devlen = jffs2_encode_dev(&dev, rdev); |
Thomas Gleixner | 182ec4e | 2005-11-07 11:16:07 +0000 | [diff] [blame] | 633 | |
| 634 | /* Try to reserve enough space for both node and dirent. |
| 635 | * Just the node will do for now, though |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 636 | */ |
| 637 | namelen = dentry->d_name.len; |
David Woodhouse | 9fe4854 | 2006-05-23 00:38:06 +0100 | [diff] [blame] | 638 | ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &alloclen, |
David Woodhouse | aef9ab4 | 2006-05-19 00:28:49 +0100 | [diff] [blame] | 639 | ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 640 | |
| 641 | if (ret) { |
| 642 | jffs2_free_raw_inode(ri); |
| 643 | return ret; |
| 644 | } |
| 645 | |
KaiGai Kohei | cfc8dc6 | 2007-09-14 15:16:35 +0900 | [diff] [blame] | 646 | inode = jffs2_new_inode(dir_i, mode, ri); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 647 | |
| 648 | if (IS_ERR(inode)) { |
| 649 | jffs2_free_raw_inode(ri); |
| 650 | jffs2_complete_reservation(c); |
| 651 | return PTR_ERR(inode); |
| 652 | } |
| 653 | inode->i_op = &jffs2_file_inode_operations; |
| 654 | init_special_inode(inode, inode->i_mode, rdev); |
| 655 | |
| 656 | f = JFFS2_INODE_INFO(inode); |
| 657 | |
| 658 | ri->dsize = ri->csize = cpu_to_je32(devlen); |
| 659 | ri->totlen = cpu_to_je32(sizeof(*ri) + devlen); |
| 660 | ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); |
| 661 | |
| 662 | ri->compr = JFFS2_COMPR_NONE; |
| 663 | ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen)); |
| 664 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); |
Thomas Gleixner | 182ec4e | 2005-11-07 11:16:07 +0000 | [diff] [blame] | 665 | |
David Woodhouse | 9fe4854 | 2006-05-23 00:38:06 +0100 | [diff] [blame] | 666 | fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, ALLOC_NORMAL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 667 | |
| 668 | jffs2_free_raw_inode(ri); |
| 669 | |
| 670 | if (IS_ERR(fn)) { |
| 671 | /* Eeek. Wave bye bye */ |
David Woodhouse | ced2207 | 2008-04-22 15:13:40 +0100 | [diff] [blame] | 672 | mutex_unlock(&f->sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 673 | jffs2_complete_reservation(c); |
David Woodhouse | f324e4c | 2010-06-03 08:03:39 +0100 | [diff] [blame] | 674 | ret = PTR_ERR(fn); |
| 675 | goto fail; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 676 | } |
Thomas Gleixner | 182ec4e | 2005-11-07 11:16:07 +0000 | [diff] [blame] | 677 | /* No data here. Only a metadata node, which will be |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 678 | obsoleted by the first data write |
| 679 | */ |
| 680 | f->metadata = fn; |
David Woodhouse | ced2207 | 2008-04-22 15:13:40 +0100 | [diff] [blame] | 681 | mutex_unlock(&f->sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 682 | |
| 683 | jffs2_complete_reservation(c); |
KaiGai Kohei | aa98d7c | 2006-05-13 15:09:47 +0900 | [diff] [blame] | 684 | |
Eric Paris | 2a7dba3 | 2011-02-01 11:05:39 -0500 | [diff] [blame] | 685 | ret = jffs2_init_security(inode, dir_i, &dentry->d_name); |
David Woodhouse | f324e4c | 2010-06-03 08:03:39 +0100 | [diff] [blame] | 686 | if (ret) |
| 687 | goto fail; |
| 688 | |
KaiGai Kohei | cfc8dc6 | 2007-09-14 15:16:35 +0900 | [diff] [blame] | 689 | ret = jffs2_init_acl_post(inode); |
David Woodhouse | f324e4c | 2010-06-03 08:03:39 +0100 | [diff] [blame] | 690 | if (ret) |
| 691 | goto fail; |
KaiGai Kohei | aa98d7c | 2006-05-13 15:09:47 +0900 | [diff] [blame] | 692 | |
David Woodhouse | 9fe4854 | 2006-05-23 00:38:06 +0100 | [diff] [blame] | 693 | ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, |
| 694 | ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); |
David Woodhouse | f324e4c | 2010-06-03 08:03:39 +0100 | [diff] [blame] | 695 | if (ret) |
| 696 | goto fail; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 697 | |
| 698 | rd = jffs2_alloc_raw_dirent(); |
| 699 | if (!rd) { |
| 700 | /* Argh. Now we treat it like a normal delete */ |
| 701 | jffs2_complete_reservation(c); |
David Woodhouse | f324e4c | 2010-06-03 08:03:39 +0100 | [diff] [blame] | 702 | ret = -ENOMEM; |
| 703 | goto fail; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 704 | } |
| 705 | |
| 706 | dir_f = JFFS2_INODE_INFO(dir_i); |
David Woodhouse | ced2207 | 2008-04-22 15:13:40 +0100 | [diff] [blame] | 707 | mutex_lock(&dir_f->sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 708 | |
| 709 | rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); |
| 710 | rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); |
| 711 | rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); |
| 712 | rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); |
| 713 | |
| 714 | rd->pino = cpu_to_je32(dir_i->i_ino); |
| 715 | rd->version = cpu_to_je32(++dir_f->highest_version); |
| 716 | rd->ino = cpu_to_je32(inode->i_ino); |
| 717 | rd->mctime = cpu_to_je32(get_seconds()); |
| 718 | rd->nsize = namelen; |
| 719 | |
| 720 | /* XXX: This is ugly. */ |
| 721 | rd->type = (mode & S_IFMT) >> 12; |
| 722 | |
| 723 | rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); |
| 724 | rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen)); |
| 725 | |
David Woodhouse | 9fe4854 | 2006-05-23 00:38:06 +0100 | [diff] [blame] | 726 | fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL); |
Thomas Gleixner | 182ec4e | 2005-11-07 11:16:07 +0000 | [diff] [blame] | 727 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 728 | if (IS_ERR(fd)) { |
Thomas Gleixner | 182ec4e | 2005-11-07 11:16:07 +0000 | [diff] [blame] | 729 | /* dirent failed to write. Delete the inode normally |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 730 | as if it were the final unlink() */ |
| 731 | jffs2_complete_reservation(c); |
| 732 | jffs2_free_raw_dirent(rd); |
David Woodhouse | ced2207 | 2008-04-22 15:13:40 +0100 | [diff] [blame] | 733 | mutex_unlock(&dir_f->sem); |
David Woodhouse | f324e4c | 2010-06-03 08:03:39 +0100 | [diff] [blame] | 734 | ret = PTR_ERR(fd); |
| 735 | goto fail; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 736 | } |
| 737 | |
| 738 | dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime)); |
| 739 | |
| 740 | jffs2_free_raw_dirent(rd); |
| 741 | |
| 742 | /* Link the fd into the inode's list, obsoleting an old |
| 743 | one if necessary. */ |
| 744 | jffs2_add_fd_to_list(c, fd, &dir_f->dents); |
| 745 | |
David Woodhouse | ced2207 | 2008-04-22 15:13:40 +0100 | [diff] [blame] | 746 | mutex_unlock(&dir_f->sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 747 | jffs2_complete_reservation(c); |
| 748 | |
David Woodhouse | e72e649 | 2010-06-03 08:09:12 +0100 | [diff] [blame] | 749 | unlock_new_inode(inode); |
Al Viro | 8fc37ec | 2012-07-19 09:18:15 +0400 | [diff] [blame] | 750 | d_instantiate(dentry, inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | return 0; |
David Woodhouse | f324e4c | 2010-06-03 08:03:39 +0100 | [diff] [blame] | 752 | |
| 753 | fail: |
Al Viro | 41cce64 | 2010-06-08 13:24:56 -0400 | [diff] [blame] | 754 | iget_failed(inode); |
David Woodhouse | f324e4c | 2010-06-03 08:03:39 +0100 | [diff] [blame] | 755 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 756 | } |
| 757 | |
| 758 | static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry, |
David Woodhouse | ef53cb0 | 2007-07-10 10:01:22 +0100 | [diff] [blame] | 759 | struct inode *new_dir_i, struct dentry *new_dentry) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 760 | { |
| 761 | int ret; |
| 762 | struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb); |
| 763 | struct jffs2_inode_info *victim_f = NULL; |
| 764 | uint8_t type; |
Artem B. Bityutskiy | 3a69e0c | 2005-08-17 14:46:26 +0100 | [diff] [blame] | 765 | uint32_t now; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 766 | |
Thomas Gleixner | 182ec4e | 2005-11-07 11:16:07 +0000 | [diff] [blame] | 767 | /* The VFS will check for us and prevent trying to rename a |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | * file over a directory and vice versa, but if it's a directory, |
| 769 | * the VFS can't check whether the victim is empty. The filesystem |
| 770 | * needs to do that for itself. |
| 771 | */ |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 772 | if (d_really_is_positive(new_dentry)) { |
| 773 | victim_f = JFFS2_INODE_INFO(d_inode(new_dentry)); |
David Howells | e36cb0b | 2015-01-29 12:02:35 +0000 | [diff] [blame] | 774 | if (d_is_dir(new_dentry)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 775 | struct jffs2_full_dirent *fd; |
| 776 | |
David Woodhouse | ced2207 | 2008-04-22 15:13:40 +0100 | [diff] [blame] | 777 | mutex_lock(&victim_f->sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 778 | for (fd = victim_f->dents; fd; fd = fd->next) { |
| 779 | if (fd->ino) { |
David Woodhouse | ced2207 | 2008-04-22 15:13:40 +0100 | [diff] [blame] | 780 | mutex_unlock(&victim_f->sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 781 | return -ENOTEMPTY; |
| 782 | } |
| 783 | } |
David Woodhouse | ced2207 | 2008-04-22 15:13:40 +0100 | [diff] [blame] | 784 | mutex_unlock(&victim_f->sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 785 | } |
| 786 | } |
| 787 | |
| 788 | /* XXX: We probably ought to alloc enough space for |
Thomas Gleixner | 182ec4e | 2005-11-07 11:16:07 +0000 | [diff] [blame] | 789 | both nodes at the same time. Writing the new link, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 790 | then getting -ENOSPC, is quite bad :) |
| 791 | */ |
| 792 | |
| 793 | /* Make a hard link */ |
Thomas Gleixner | 182ec4e | 2005-11-07 11:16:07 +0000 | [diff] [blame] | 794 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 795 | /* XXX: This is ugly */ |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 796 | type = (d_inode(old_dentry)->i_mode & S_IFMT) >> 12; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 797 | if (!type) type = DT_REG; |
| 798 | |
Artem B. Bityutskiy | 3a69e0c | 2005-08-17 14:46:26 +0100 | [diff] [blame] | 799 | now = get_seconds(); |
Thomas Gleixner | 182ec4e | 2005-11-07 11:16:07 +0000 | [diff] [blame] | 800 | ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i), |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 801 | d_inode(old_dentry)->i_ino, type, |
Artem B. Bityutskiy | 3a69e0c | 2005-08-17 14:46:26 +0100 | [diff] [blame] | 802 | new_dentry->d_name.name, new_dentry->d_name.len, now); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 803 | |
| 804 | if (ret) |
| 805 | return ret; |
| 806 | |
| 807 | if (victim_f) { |
| 808 | /* There was a victim. Kill it off nicely */ |
David Howells | e36cb0b | 2015-01-29 12:02:35 +0000 | [diff] [blame] | 809 | if (d_is_dir(new_dentry)) |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 810 | clear_nlink(d_inode(new_dentry)); |
Al Viro | 22ba747 | 2011-07-21 15:57:47 -0400 | [diff] [blame] | 811 | else |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 812 | drop_nlink(d_inode(new_dentry)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 813 | /* Don't oops if the victim was a dirent pointing to an |
| 814 | inode which didn't exist. */ |
| 815 | if (victim_f->inocache) { |
David Woodhouse | ced2207 | 2008-04-22 15:13:40 +0100 | [diff] [blame] | 816 | mutex_lock(&victim_f->sem); |
David Howells | e36cb0b | 2015-01-29 12:02:35 +0000 | [diff] [blame] | 817 | if (d_is_dir(new_dentry)) |
David Woodhouse | 27c72b0 | 2008-05-01 18:47:17 +0100 | [diff] [blame] | 818 | victim_f->inocache->pino_nlink = 0; |
| 819 | else |
| 820 | victim_f->inocache->pino_nlink--; |
David Woodhouse | ced2207 | 2008-04-22 15:13:40 +0100 | [diff] [blame] | 821 | mutex_unlock(&victim_f->sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 822 | } |
| 823 | } |
| 824 | |
Thomas Gleixner | 182ec4e | 2005-11-07 11:16:07 +0000 | [diff] [blame] | 825 | /* If it was a directory we moved, and there was no victim, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 826 | increase i_nlink on its new parent */ |
David Howells | e36cb0b | 2015-01-29 12:02:35 +0000 | [diff] [blame] | 827 | if (d_is_dir(old_dentry) && !victim_f) |
Dave Hansen | d8c76e6 | 2006-09-30 23:29:04 -0700 | [diff] [blame] | 828 | inc_nlink(new_dir_i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 829 | |
| 830 | /* Unlink the original */ |
Thomas Gleixner | 182ec4e | 2005-11-07 11:16:07 +0000 | [diff] [blame] | 831 | ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i), |
Artem B. Bityutskiy | 3a69e0c | 2005-08-17 14:46:26 +0100 | [diff] [blame] | 832 | old_dentry->d_name.name, old_dentry->d_name.len, NULL, now); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 833 | |
| 834 | /* We don't touch inode->i_nlink */ |
| 835 | |
| 836 | if (ret) { |
| 837 | /* Oh shit. We really ought to make a single node which can do both atomically */ |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 838 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(d_inode(old_dentry)); |
David Woodhouse | ced2207 | 2008-04-22 15:13:40 +0100 | [diff] [blame] | 839 | mutex_lock(&f->sem); |
David Howells | 2b0143b | 2015-03-17 22:25:59 +0000 | [diff] [blame] | 840 | inc_nlink(d_inode(old_dentry)); |
David Howells | e36cb0b | 2015-01-29 12:02:35 +0000 | [diff] [blame] | 841 | if (f->inocache && !d_is_dir(old_dentry)) |
David Woodhouse | 27c72b0 | 2008-05-01 18:47:17 +0100 | [diff] [blame] | 842 | f->inocache->pino_nlink++; |
David Woodhouse | ced2207 | 2008-04-22 15:13:40 +0100 | [diff] [blame] | 843 | mutex_unlock(&f->sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 844 | |
Joe Perches | da320f0 | 2012-02-15 15:56:44 -0800 | [diff] [blame] | 845 | pr_notice("%s(): Link succeeded, unlink failed (err %d). You now have a hard link\n", |
| 846 | __func__, ret); |
Al Viro | f938128 | 2016-03-07 23:07:10 -0500 | [diff] [blame] | 847 | /* |
| 848 | * We can't keep the target in dcache after that. |
| 849 | * For one thing, we can't afford dentry aliases for directories. |
| 850 | * For another, if there was a victim, we _can't_ set new inode |
| 851 | * for that sucker and we have to trigger mount eviction - the |
| 852 | * caller won't do it on its own since we are returning an error. |
| 853 | */ |
| 854 | d_invalidate(new_dentry); |
Artem B. Bityutskiy | 3a69e0c | 2005-08-17 14:46:26 +0100 | [diff] [blame] | 855 | new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 856 | return ret; |
| 857 | } |
| 858 | |
David Howells | e36cb0b | 2015-01-29 12:02:35 +0000 | [diff] [blame] | 859 | if (d_is_dir(old_dentry)) |
Dave Hansen | 9a53c3a | 2006-09-30 23:29:03 -0700 | [diff] [blame] | 860 | drop_nlink(old_dir_i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 861 | |
Artem B. Bityutskiy | 3a69e0c | 2005-08-17 14:46:26 +0100 | [diff] [blame] | 862 | new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now); |
| 863 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 864 | return 0; |
| 865 | } |
| 866 | |