diff options
Diffstat (limited to 'cpukit/libfs/src/jffs2/src/dir-rtems.c')
| -rw-r--r-- | cpukit/libfs/src/jffs2/src/dir-rtems.c | 371 |
1 files changed, 371 insertions, 0 deletions
diff --git a/cpukit/libfs/src/jffs2/src/dir-rtems.c b/cpukit/libfs/src/jffs2/src/dir-rtems.c new file mode 100644 index 0000000000..16b62cc15f --- /dev/null +++ b/cpukit/libfs/src/jffs2/src/dir-rtems.c @@ -0,0 +1,371 @@ +/* + * JFFS2 -- Journalling Flash File System, Version 2. + * + * Copyright (C) 2001-2003 Free Software Foundation, Inc. + * + * Created by David Woodhouse <dwmw2@cambridge.redhat.com> + * + * For licensing information, see the file 'LICENCE' in this directory. + * + * $Id: dir-ecos.c,v 1.11 2005/02/08 19:36:27 lunn Exp $ + * + */ + +#include <linux/kernel.h> +#include <linux/crc32.h> +#include "nodelist.h" + +/***********************************************************************/ + +/* Takes length argument because it can be either NUL-terminated or '/'-terminated */ +struct _inode *jffs2_lookup(struct _inode *dir_i, const unsigned char *d_name, int namelen) +{ + struct jffs2_inode_info *dir_f; + struct jffs2_sb_info *c; + struct jffs2_full_dirent *fd = NULL, *fd_list; + uint32_t ino = 0; + uint32_t hash = full_name_hash(d_name, namelen); + struct _inode *inode = NULL; + + D1(printk("jffs2_lookup()\n")); + + dir_f = JFFS2_INODE_INFO(dir_i); + c = JFFS2_SB_INFO(dir_i->i_sb); + + down(&dir_f->sem); + + /* NB: The 2.2 backport will need to explicitly check for '.' and '..' here */ + for (fd_list = dir_f->dents; fd_list && fd_list->nhash <= hash; fd_list = fd_list->next) { + if (fd_list->nhash == hash && + (!fd || fd_list->version > fd->version) && + strlen((char *)fd_list->name) == namelen && + !strncmp((char *)fd_list->name, (char *)d_name, namelen)) { + fd = fd_list; + } + } + if (fd) + ino = fd->ino; + up(&dir_f->sem); + if (ino) { + inode = jffs2_iget(dir_i->i_sb, ino); + if (IS_ERR(inode)) { + printk("jffs2_iget() failed for ino #%u\n", ino); + return inode; + } + } + + return inode; +} + +/***********************************************************************/ + + + +int jffs2_create(struct _inode *dir_i, const unsigned char *d_name, int mode, + struct _inode **new_i) +{ + struct jffs2_raw_inode *ri; + struct jffs2_inode_info *f, *dir_f; + struct jffs2_sb_info *c; + struct _inode *inode; + int ret; + + ri = jffs2_alloc_raw_inode(); + if (!ri) + return -ENOMEM; + + c = JFFS2_SB_INFO(dir_i->i_sb); + + D1(printk(KERN_DEBUG "jffs2_create()\n")); + + inode = jffs2_new_inode(dir_i, mode, ri); + + if (IS_ERR(inode)) { + D1(printk(KERN_DEBUG "jffs2_new_inode() failed\n")); + jffs2_free_raw_inode(ri); + return PTR_ERR(inode); + } + + f = JFFS2_INODE_INFO(inode); + dir_f = JFFS2_INODE_INFO(dir_i); + + ret = jffs2_do_create(c, dir_f, f, ri, + (const char *)d_name, + strlen((char *)d_name)); + + if (ret) { + inode->i_nlink = 0; + jffs2_iput(inode); + jffs2_free_raw_inode(ri); + return ret; + } + + jffs2_free_raw_inode(ri); + + D1(printk(KERN_DEBUG "jffs2_create: Created ino #%lu with mode %o, nlink %d(%d)\n", + inode->i_ino, inode->i_mode, inode->i_nlink, f->inocache->nlink)); + *new_i = inode; + return 0; +} + +/***********************************************************************/ + + +int jffs2_unlink(struct _inode *dir_i, struct _inode *d_inode, const unsigned char *d_name) +{ + struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb); + struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); + struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(d_inode); + int ret; + + ret = jffs2_do_unlink(c, dir_f, (const char *)d_name, + strlen((char *)d_name), dead_f); + if (dead_f->inocache) + d_inode->i_nlink = dead_f->inocache->nlink; + return ret; +} +/***********************************************************************/ + + +int jffs2_link (struct _inode *old_d_inode, struct _inode *dir_i, const unsigned char *d_name) +{ + struct jffs2_sb_info *c = JFFS2_SB_INFO(old_d_inode->i_sb); + struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_d_inode); + struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i); + int ret; + + /* XXX: This is ugly */ + uint8_t type = (old_d_inode->i_mode & S_IFMT) >> 12; + if (!type) type = DT_REG; + + ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, + (const char * )d_name, + strlen((char *)d_name)); + + if (!ret) { + down(&f->sem); + old_d_inode->i_nlink = ++f->inocache->nlink; + up(&f->sem); + } + return ret; +} + +int jffs2_mkdir (struct _inode *dir_i, const unsigned char *d_name, int mode) +{ + struct jffs2_inode_info *f, *dir_f; + struct jffs2_sb_info *c; + struct _inode *inode; + struct jffs2_raw_inode *ri; + struct jffs2_raw_dirent *rd; + struct jffs2_full_dnode *fn; + struct jffs2_full_dirent *fd; + int namelen; + uint32_t alloclen, phys_ofs; + int ret; + + mode |= S_IFDIR; + + ri = jffs2_alloc_raw_inode(); + if (!ri) + return -ENOMEM; + + c = JFFS2_SB_INFO(dir_i->i_sb); + + /* Try to reserve enough space for both node and dirent. + * Just the node will do for now, though + */ + namelen = strlen((char *)d_name); + ret = jffs2_reserve_space(c, sizeof(*ri), &phys_ofs, &alloclen, ALLOC_NORMAL); + + if (ret) { + jffs2_free_raw_inode(ri); + return ret; + } + + inode = jffs2_new_inode(dir_i, mode, ri); + + if (IS_ERR(inode)) { + jffs2_free_raw_inode(ri); + jffs2_complete_reservation(c); + return PTR_ERR(inode); + } + + f = JFFS2_INODE_INFO(inode); + + ri->data_crc = cpu_to_je32(0); + ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); + + fn = jffs2_write_dnode(c, f, ri, NULL, 0, phys_ofs, ALLOC_NORMAL); + + jffs2_free_raw_inode(ri); + + if (IS_ERR(fn)) { + /* Eeek. Wave bye bye */ + up(&f->sem); + jffs2_complete_reservation(c); + inode->i_nlink = 0; + jffs2_iput(inode); + return PTR_ERR(fn); + } + /* No data here. Only a metadata node, which will be + obsoleted by the first data write + */ + f->metadata = fn; + up(&f->sem); + + jffs2_complete_reservation(c); + ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, ALLOC_NORMAL); + if (ret) { + /* Eep. */ + inode->i_nlink = 0; + jffs2_iput(inode); + return ret; + } + + rd = jffs2_alloc_raw_dirent(); + if (!rd) { + /* Argh. Now we treat it like a normal delete */ + jffs2_complete_reservation(c); + inode->i_nlink = 0; + jffs2_iput(inode); + return -ENOMEM; + } + + dir_f = JFFS2_INODE_INFO(dir_i); + down(&dir_f->sem); + + rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); + rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); + rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); + rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); + + rd->pino = cpu_to_je32(dir_i->i_ino); + rd->version = cpu_to_je32(++dir_f->highest_version); + rd->ino = cpu_to_je32(inode->i_ino); + rd->mctime = cpu_to_je32(cyg_timestamp()); + rd->nsize = namelen; + rd->type = DT_DIR; + rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); + rd->name_crc = cpu_to_je32(crc32(0, d_name, namelen)); + + fd = jffs2_write_dirent(c, dir_f, rd, d_name, namelen, phys_ofs, ALLOC_NORMAL); + + jffs2_complete_reservation(c); + jffs2_free_raw_dirent(rd); + + if (IS_ERR(fd)) { + /* dirent failed to write. Delete the inode normally + as if it were the final unlink() */ + up(&dir_f->sem); + inode->i_nlink = 0; + jffs2_iput(inode); + return PTR_ERR(fd); + } + + /* Link the fd into the inode's list, obsoleting an old + one if necessary. */ + jffs2_add_fd_to_list(c, fd, &dir_f->dents); + up(&dir_f->sem); + + jffs2_iput(inode); + return 0; +} + +int jffs2_rmdir (struct _inode *dir_i, struct _inode *d_inode, const unsigned char *d_name) +{ + struct jffs2_inode_info *f = JFFS2_INODE_INFO(d_inode); + struct jffs2_full_dirent *fd; + + for (fd = f->dents ; fd; fd = fd->next) { + if (fd->ino) + return EPERM; //-ENOTEMPTY; + } + return jffs2_unlink(dir_i, d_inode, d_name); +} + +int jffs2_rename (struct _inode *old_dir_i, struct _inode *d_inode, const unsigned char *old_d_name, + struct _inode *new_dir_i, const unsigned char *new_d_name) +{ + int ret; + struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb); + struct jffs2_inode_info *victim_f = NULL; + uint8_t type; + +#if 0 /* FIXME -- this really doesn't belong in individual file systems. + The fileio code ought to do this for us, or at least part of it */ + if (new_dentry->d_inode) { + if (S_ISDIR(d_inode->i_mode) && + !S_ISDIR(new_dentry->d_inode->i_mode)) { + /* Cannot rename directory over non-directory */ + return -EINVAL; + } + + victim_f = JFFS2_INODE_INFO(new_dentry->d_inode); + + if (S_ISDIR(new_dentry->d_inode->i_mode)) { + struct jffs2_full_dirent *fd; + + if (!S_ISDIR(d_inode->i_mode)) { + /* Cannot rename non-directory over directory */ + return -EINVAL; + } + down(&victim_f->sem); + for (fd = victim_f->dents; fd; fd = fd->next) { + if (fd->ino) { + up(&victim_f->sem); + return -ENOTEMPTY; + } + } + up(&victim_f->sem); + } + } +#endif + + /* XXX: We probably ought to alloc enough space for + both nodes at the same time. Writing the new link, + then getting -ENOSPC, is quite bad :) + */ + + /* Make a hard link */ + + /* XXX: This is ugly */ + type = (d_inode->i_mode & S_IFMT) >> 12; + if (!type) type = DT_REG; + + ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i), + d_inode->i_ino, type, + (const char *)new_d_name, + strlen((char *)new_d_name)); + + if (ret) + return ret; + + if (victim_f) { + /* There was a victim. Kill it off nicely */ + /* Don't oops if the victim was a dirent pointing to an + inode which didn't exist. */ + if (victim_f->inocache) { + down(&victim_f->sem); + victim_f->inocache->nlink--; + up(&victim_f->sem); + } + } + + /* Unlink the original */ + ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i), + (const char *)old_d_name, + strlen((char *)old_d_name), NULL); + + if (ret) { + /* Oh shit. We really ought to make a single node which can do both atomically */ + struct jffs2_inode_info *f = JFFS2_INODE_INFO(d_inode); + down(&f->sem); + if (f->inocache) + d_inode->i_nlink = f->inocache->nlink++; + up(&f->sem); + + printk(KERN_NOTICE "jffs2_rename(): Link succeeded, unlink failed (err %d). You now have a hard link\n", ret); + } + return ret; +} + |