patch-2.4.10 linux/fs/jffs2/readinode.c
Next file: linux/fs/jffs2/scan.c
Previous file: linux/fs/jffs2/read.c
Back to the patch index
Back to the overall index
- Lines: 495
- Date:
Fri Sep 14 14:04:07 2001
- Orig file:
v2.4.9/linux/fs/jffs2/readinode.c
- Orig date:
Wed Dec 31 16:00:00 1969
diff -u --recursive --new-file v2.4.9/linux/fs/jffs2/readinode.c linux/fs/jffs2/readinode.c
@@ -0,0 +1,494 @@
+/*
+ * JFFS2 -- Journalling Flash File System, Version 2.
+ *
+ * Copyright (C) 2001 Red Hat, Inc.
+ *
+ * Created by David Woodhouse <dwmw2@cambridge.redhat.com>
+ *
+ * The original JFFS, from which the design for JFFS2 was derived,
+ * was designed and implemented by Axis Communications AB.
+ *
+ * The contents of this file are subject to the Red Hat eCos Public
+ * License Version 1.1 (the "Licence"); you may not use this file
+ * except in compliance with the Licence. You may obtain a copy of
+ * the Licence at http://www.redhat.com/
+ *
+ * Software distributed under the Licence is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.
+ * See the Licence for the specific language governing rights and
+ * limitations under the Licence.
+ *
+ * The Original Code is JFFS2 - Journalling Flash File System, version 2
+ *
+ * Alternatively, the contents of this file may be used under the
+ * terms of the GNU General Public License version 2 (the "GPL"), in
+ * which case the provisions of the GPL are applicable instead of the
+ * above. If you wish to allow the use of your version of this file
+ * only under the terms of the GPL and not to allow others to use your
+ * version of this file under the RHEPL, indicate your decision by
+ * deleting the provisions above and replace them with the notice and
+ * other provisions required by the GPL. If you do not delete the
+ * provisions above, a recipient may use your version of this file
+ * under either the RHEPL or the GPL.
+ *
+ * $Id: readinode.c,v 1.56 2001/07/26 20:32:39 dwmw2 Exp $
+ *
+ */
+
+/* Given an inode, probably with existing list of fragments, add the new node
+ * to the fragment list.
+ */
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/fs.h>
+#include <linux/mtd/mtd.h>
+#include <linux/jffs2.h>
+#include "nodelist.h"
+#include "crc32.h"
+
+
+D1(void jffs2_print_frag_list(struct jffs2_inode_info *f)
+{
+ struct jffs2_node_frag *this = f->fraglist;
+
+ while(this) {
+ if (this->node)
+ printk(KERN_DEBUG "frag %04x-%04x: 0x%08x on flash (*%p->%p)\n", this->ofs, this->ofs+this->size, this->node->raw->flash_offset &~3, this, this->next);
+ else
+ printk(KERN_DEBUG "frag %04x-%04x: hole (*%p->%p)\n", this->ofs, this->ofs+this->size, this, this->next);
+ this = this->next;
+ }
+ if (f->metadata) {
+ printk(KERN_DEBUG "metadata at 0x%08x\n", f->metadata->raw->flash_offset &~3);
+ }
+})
+
+
+int jffs2_add_full_dnode_to_inode(struct jffs2_sb_info *c, struct jffs2_inode_info *f, struct jffs2_full_dnode *fn)
+{
+ int ret;
+ D1(printk(KERN_DEBUG "jffs2_add_full_dnode_to_inode(ino #%u, f %p, fn %p)\n", f->inocache->ino, f, fn));
+
+ ret = jffs2_add_full_dnode_to_fraglist(c, &f->fraglist, fn);
+
+ D2(jffs2_print_frag_list(f));
+ return ret;
+}
+
+static void jffs2_obsolete_node_frag(struct jffs2_sb_info *c, struct jffs2_node_frag *this)
+{
+ if (this->node) {
+ this->node->frags--;
+ if (!this->node->frags) {
+ /* The node has no valid frags left. It's totally obsoleted */
+ D2(printk(KERN_DEBUG "Marking old node @0x%08x (0x%04x-0x%04x) obsolete\n",
+ this->node->raw->flash_offset &~3, this->node->ofs, this->node->ofs+this->node->size));
+ jffs2_mark_node_obsolete(c, this->node->raw);
+ jffs2_free_full_dnode(this->node);
+ } else {
+ D2(printk(KERN_DEBUG "Not marking old node @0x%08x (0x%04x-0x%04x) obsolete. frags is %d\n",
+ this->node->raw->flash_offset &~3, this->node->ofs, this->node->ofs+this->node->size,
+ this->node->frags));
+ }
+
+ }
+ jffs2_free_node_frag(this);
+}
+
+/* Doesn't set inode->i_size */
+int jffs2_add_full_dnode_to_fraglist(struct jffs2_sb_info *c, struct jffs2_node_frag **list, struct jffs2_full_dnode *fn)
+{
+
+ struct jffs2_node_frag *this, **prev, *old;
+ struct jffs2_node_frag *newfrag, *newfrag2;
+ __u32 lastend = 0;
+
+
+ newfrag = jffs2_alloc_node_frag();
+ if (!newfrag) {
+ return -ENOMEM;
+ }
+
+ D2(if (fn->raw)
+ printk(KERN_DEBUG "adding node %04x-%04x @0x%08x on flash, newfrag *%p\n", fn->ofs, fn->ofs+fn->size, fn->raw->flash_offset &~3, newfrag);
+ else
+ printk(KERN_DEBUG "adding hole node %04x-%04x on flash, newfrag *%p\n", fn->ofs, fn->ofs+fn->size, newfrag));
+
+ prev = list;
+ this = *list;
+
+ if (!fn->size) {
+ jffs2_free_node_frag(newfrag);
+ return 0;
+ }
+
+ newfrag->ofs = fn->ofs;
+ newfrag->size = fn->size;
+ newfrag->node = fn;
+ newfrag->node->frags = 1;
+ newfrag->next = (void *)0xdeadbeef;
+
+ /* Skip all the nodes which are completed before this one starts */
+ while(this && fn->ofs >= this->ofs+this->size) {
+ lastend = this->ofs + this->size;
+
+ D2(printk(KERN_DEBUG "j_a_f_d_t_f: skipping frag 0x%04x-0x%04x; phys 0x%08x (*%p->%p)\n",
+ this->ofs, this->ofs+this->size, this->node?(this->node->raw->flash_offset &~3):0xffffffff, this, this->next));
+ prev = &this->next;
+ this = this->next;
+ }
+
+ /* See if we ran off the end of the list */
+ if (!this) {
+ /* We did */
+ if (lastend < fn->ofs) {
+ /* ... and we need to put a hole in before the new node */
+ struct jffs2_node_frag *holefrag = jffs2_alloc_node_frag();
+ if (!holefrag)
+ return -ENOMEM;
+ holefrag->ofs = lastend;
+ holefrag->size = fn->ofs - lastend;
+ holefrag->next = NULL;
+ holefrag->node = NULL;
+ *prev = holefrag;
+ prev = &holefrag->next;
+ }
+ newfrag->next = NULL;
+ *prev = newfrag;
+ return 0;
+ }
+
+ D2(printk(KERN_DEBUG "j_a_f_d_t_f: dealing with frag 0x%04x-0x%04x; phys 0x%08x (*%p->%p)\n",
+ this->ofs, this->ofs+this->size, this->node?(this->node->raw->flash_offset &~3):0xffffffff, this, this->next));
+
+ /* OK. 'this' is pointing at the first frag that fn->ofs at least partially obsoletes,
+ * - i.e. fn->ofs < this->ofs+this->size && fn->ofs >= this->ofs
+ */
+ if (fn->ofs > this->ofs) {
+ /* This node isn't completely obsoleted. The start of it remains valid */
+ if (this->ofs + this->size > fn->ofs + fn->size) {
+ /* The new node splits 'this' frag into two */
+ newfrag2 = jffs2_alloc_node_frag();
+ if (!newfrag2) {
+ jffs2_free_node_frag(newfrag);
+ return -ENOMEM;
+ }
+ printk(KERN_DEBUG "split old frag 0x%04x-0x%04x -->", this->ofs, this->ofs+this->size);
+ if (this->node)
+ printk("phys 0x%08x\n", this->node->raw->flash_offset &~3);
+ else
+ printk("hole\n");
+
+ newfrag2->ofs = fn->ofs + fn->size;
+ newfrag2->size = (this->ofs+this->size) - newfrag2->ofs;
+ newfrag2->next = this->next;
+ newfrag2->node = this->node;
+ if (this->node)
+ this->node->frags++;
+ newfrag->next = newfrag2;
+ this->next = newfrag;
+ this->size = newfrag->ofs - this->ofs;
+ return 0;
+ }
+ /* New node just reduces 'this' frag in size, doesn't split it */
+ this->size = fn->ofs - this->ofs;
+ newfrag->next = this->next;
+ this->next = newfrag;
+ this = newfrag->next;
+ } else {
+ D2(printk(KERN_DEBUG "Inserting newfrag (*%p) in before 'this' (*%p)\n", newfrag, this));
+ *prev = newfrag;
+ newfrag->next = this;
+ }
+ /* OK, now we have newfrag added in the correct place in the list, but
+ newfrag->next points to a fragment which may be overlapping it
+ */
+ while (this && newfrag->ofs + newfrag->size >= this->ofs + this->size) {
+ /* 'this' frag is obsoleted. */
+ old = this;
+ this = old->next;
+ jffs2_obsolete_node_frag(c, old);
+ }
+ /* Now we're pointing at the first frag which isn't totally obsoleted by
+ the new frag */
+ newfrag->next = this;
+
+ if (!this || newfrag->ofs + newfrag->size == this->ofs) {
+ return 0;
+ }
+ /* Still some overlap */
+ this->size = (this->ofs + this->size) - (newfrag->ofs + newfrag->size);
+ this->ofs = newfrag->ofs + newfrag->size;
+ return 0;
+}
+
+void jffs2_truncate_fraglist (struct jffs2_sb_info *c, struct jffs2_node_frag **list, __u32 size)
+{
+ D1(printk(KERN_DEBUG "Truncating fraglist to 0x%08x bytes\n", size));
+
+ while (*list) {
+ if ((*list)->ofs >= size) {
+ struct jffs2_node_frag *this = *list;
+ *list = this->next;
+ D1(printk(KERN_DEBUG "Removing frag 0x%08x-0x%08x\n", this->ofs, this->ofs+this->size));
+ jffs2_obsolete_node_frag(c, this);
+ continue;
+ } else if ((*list)->ofs + (*list)->size > size) {
+ D1(printk(KERN_DEBUG "Truncating frag 0x%08x-0x%08x\n", (*list)->ofs, (*list)->ofs + (*list)->size));
+ (*list)->size = size - (*list)->ofs;
+ }
+ list = &(*list)->next;
+ }
+}
+
+/* Scan the list of all nodes present for this ino, build map of versions, etc. */
+
+void jffs2_read_inode (struct inode *inode)
+{
+ struct jffs2_tmp_dnode_info *tn_list, *tn;
+ struct jffs2_full_dirent *fd_list;
+ struct jffs2_inode_info *f;
+ struct jffs2_full_dnode *fn = NULL;
+ struct jffs2_sb_info *c;
+ struct jffs2_raw_inode latest_node;
+ int ret;
+ ssize_t retlen;
+
+ D1(printk(KERN_DEBUG "jffs2_read_inode(): inode->i_ino == %lu\n", inode->i_ino));
+
+ f = JFFS2_INODE_INFO(inode);
+ c = JFFS2_SB_INFO(inode->i_sb);
+
+ memset(f, 0, sizeof(*f));
+ D2(printk(KERN_DEBUG "getting inocache\n"));
+ init_MUTEX(&f->sem);
+ f->inocache = jffs2_get_ino_cache(c, inode->i_ino);
+ D2(printk(KERN_DEBUG "jffs2_read_inode(): Got inocache at %p\n", f->inocache));
+
+ if (!f->inocache && inode->i_ino == 1) {
+ /* Special case - no root inode on medium */
+ f->inocache = jffs2_alloc_inode_cache();
+ if (!f->inocache) {
+ printk(KERN_CRIT "jffs2_read_inode(): Cannot allocate inocache for root inode\n");
+ make_bad_inode(inode);
+ return;
+ }
+ D1(printk(KERN_DEBUG "jffs2_read_inode(): Creating inocache for root inode\n"));
+ memset(f->inocache, 0, sizeof(struct jffs2_inode_cache));
+ f->inocache->ino = f->inocache->nlink = 1;
+ f->inocache->nodes = (struct jffs2_raw_node_ref *)f->inocache;
+ jffs2_add_ino_cache(c, f->inocache);
+ }
+ if (!f->inocache) {
+ printk(KERN_WARNING "jffs2_read_inode() on nonexistent ino %lu\n", (unsigned long)inode->i_ino);
+ make_bad_inode(inode);
+ return;
+ }
+ D1(printk(KERN_DEBUG "jffs2_read_inode(): ino #%lu nlink is %d\n", (unsigned long)inode->i_ino, f->inocache->nlink));
+ inode->i_nlink = f->inocache->nlink;
+
+ /* Grab all nodes relevant to this ino */
+ ret = jffs2_get_inode_nodes(c, inode->i_ino, f, &tn_list, &fd_list, &f->highest_version);
+
+ if (ret) {
+ printk(KERN_CRIT "jffs2_get_inode_nodes() for ino %lu returned %d\n", inode->i_ino, ret);
+ make_bad_inode(inode);
+ return;
+ }
+ f->dents = fd_list;
+
+ while (tn_list) {
+ static __u32 mdata_ver = 0;
+
+ tn = tn_list;
+
+ fn = tn->fn;
+
+ if (f->metadata && tn->version > mdata_ver) {
+ D1(printk(KERN_DEBUG "Obsoleting old metadata at 0x%08x\n", f->metadata->raw->flash_offset &~3));
+ jffs2_mark_node_obsolete(c, f->metadata->raw);
+ jffs2_free_full_dnode(f->metadata);
+ f->metadata = NULL;
+
+ mdata_ver = 0;
+ }
+
+ if (fn->size) {
+ jffs2_add_full_dnode_to_inode(c, f, fn);
+ } else {
+ /* Zero-sized node at end of version list. Just a metadata update */
+ D1(printk(KERN_DEBUG "metadata @%08x: ver %d\n", fn->raw->flash_offset &~3, tn->version));
+ f->metadata = fn;
+ mdata_ver = tn->version;
+ }
+ tn_list = tn->next;
+ jffs2_free_tmp_dnode_info(tn);
+ }
+ if (!fn) {
+ /* No data nodes for this inode. */
+ if (inode->i_ino != 1) {
+ printk(KERN_WARNING "jffs2_read_inode(): No data nodes found for ino #%lu\n", inode->i_ino);
+ if (!fd_list) {
+ make_bad_inode(inode);
+ return;
+ }
+ printk(KERN_WARNING "jffs2_read_inode(): But it has children so we fake some modes for it\n");
+ }
+ inode->i_mode = S_IFDIR | S_IRUGO | S_IWUSR | S_IXUGO;
+ inode->i_atime = inode->i_ctime = inode->i_mtime = CURRENT_TIME;
+ inode->i_nlink = f->inocache->nlink;
+ inode->i_size = 0;
+ } else {
+ __u32 crc;
+
+ ret = c->mtd->read(c->mtd, fn->raw->flash_offset & ~3, sizeof(latest_node), &retlen, (void *)&latest_node);
+ if (ret || retlen != sizeof(latest_node)) {
+ printk(KERN_NOTICE "MTD read in jffs2_read_inode() failed: Returned %d, %ld of %d bytes read\n",
+ ret, (long)retlen, sizeof(latest_node));
+ jffs2_clear_inode(inode);
+ make_bad_inode(inode);
+ return;
+ }
+
+ crc = crc32(0, &latest_node, sizeof(latest_node)-8);
+ if (crc != latest_node.node_crc) {
+ printk(KERN_NOTICE "CRC failed for read_inode of inode %ld at physical location 0x%x\n", inode->i_ino, fn->raw->flash_offset & ~3);
+ jffs2_clear_inode(inode);
+ make_bad_inode(inode);
+ return;
+ }
+
+ inode->i_mode = latest_node.mode;
+ inode->i_uid = latest_node.uid;
+ inode->i_gid = latest_node.gid;
+ inode->i_size = latest_node.isize;
+ if ((inode->i_mode & S_IFMT) == S_IFREG)
+ jffs2_truncate_fraglist(c, &f->fraglist, latest_node.isize);
+ inode->i_atime = latest_node.atime;
+ inode->i_mtime = latest_node.mtime;
+ inode->i_ctime = latest_node.ctime;
+ }
+
+ /* OK, now the special cases. Certain inode types should
+ have only one data node, and it's kept as the metadata
+ node */
+ if ((inode->i_mode & S_IFMT) == S_IFBLK ||
+ (inode->i_mode & S_IFMT) == S_IFCHR ||
+ (inode->i_mode & S_IFMT) == S_IFLNK) {
+ if (f->metadata) {
+ printk(KERN_WARNING "Argh. Special inode #%lu with mode 0%o had metadata node\n", inode->i_ino, inode->i_mode);
+ jffs2_clear_inode(inode);
+ make_bad_inode(inode);
+ return;
+ }
+ if (!f->fraglist) {
+ printk(KERN_WARNING "Argh. Special inode #%lu with mode 0%o has no fragments\n", inode->i_ino, inode->i_mode);
+ jffs2_clear_inode(inode);
+ make_bad_inode(inode);
+ return;
+ }
+ /* ASSERT: f->fraglist != NULL */
+ if (f->fraglist->next) {
+ printk(KERN_WARNING "Argh. Special inode #%lu had more than one node\n", inode->i_ino);
+ jffs2_clear_inode(inode);
+ make_bad_inode(inode);
+ return;
+ }
+ /* OK. We're happy */
+ f->metadata = f->fraglist->node;
+ jffs2_free_node_frag(f->fraglist);
+ f->fraglist = NULL;
+ }
+
+ inode->i_blksize = PAGE_SIZE;
+ inode->i_blocks = (inode->i_size + 511) >> 9;
+
+ switch (inode->i_mode & S_IFMT) {
+ unsigned short rdev;
+
+ case S_IFLNK:
+ inode->i_op = &jffs2_symlink_inode_operations;
+ break;
+
+ case S_IFDIR:
+ inode->i_op = &jffs2_dir_inode_operations;
+ inode->i_fop = &jffs2_dir_operations;
+ break;
+
+ case S_IFREG:
+ inode->i_op = &jffs2_file_inode_operations;
+ inode->i_fop = &jffs2_file_operations;
+ inode->i_mapping->a_ops = &jffs2_file_address_operations;
+ inode->i_mapping->nrpages = 0;
+ break;
+
+ case S_IFBLK:
+ case S_IFCHR:
+ /* Read the device numbers from the media */
+ D1(printk(KERN_DEBUG "Reading device numbers from flash\n"));
+ if (jffs2_read_dnode(c, f->metadata, (char *)&rdev, 0, sizeof(rdev)) < 0) {
+ /* Eep */
+ printk(KERN_NOTICE "Read device numbers for inode %lu failed\n", (unsigned long)inode->i_ino);
+ jffs2_clear_inode(inode);
+ make_bad_inode(inode);
+ return;
+ }
+
+ case S_IFSOCK:
+ case S_IFIFO:
+ inode->i_op = &jffs2_file_inode_operations;
+ init_special_inode(inode, inode->i_mode, kdev_t_to_nr(MKDEV(rdev>>8, rdev&0xff)));
+ break;
+
+ default:
+ printk(KERN_WARNING "jffs2_read_inode(): Bogus imode %o for ino %lu", inode->i_mode, (unsigned long)inode->i_ino);
+ }
+ D1(printk(KERN_DEBUG "jffs2_read_inode() returning\n"));
+}
+
+void jffs2_clear_inode (struct inode *inode)
+{
+ /* We can forget about this inode for now - drop all
+ * the nodelists associated with it, etc.
+ */
+ struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
+ struct jffs2_node_frag *frag, *frags;
+ struct jffs2_full_dirent *fd, *fds;
+ struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
+
+ D1(printk(KERN_DEBUG "jffs2_clear_inode(): ino #%lu mode %o\n", inode->i_ino, inode->i_mode));
+
+ frags = f->fraglist;
+ fds = f->dents;
+ if (f->metadata) {
+ if (!f->inocache->nlink)
+ jffs2_mark_node_obsolete(c, f->metadata->raw);
+ jffs2_free_full_dnode(f->metadata);
+ }
+
+ while (frags) {
+ frag = frags;
+ frags = frag->next;
+ D2(printk(KERN_DEBUG "jffs2_clear_inode: frag at 0x%x-0x%x: node %p, frags %d--\n", frag->ofs, frag->ofs+frag->size, frag->node, frag->node?frag->node->frags:0));
+
+ if (frag->node && !(--frag->node->frags)) {
+ /* Not a hole, and it's the final remaining frag of this node. Free the node */
+ if (!f->inocache->nlink)
+ jffs2_mark_node_obsolete(c, frag->node->raw);
+
+ jffs2_free_full_dnode(frag->node);
+ }
+ jffs2_free_node_frag(frag);
+ }
+ while(fds) {
+ fd = fds;
+ fds = fd->next;
+ jffs2_free_full_dirent(fd);
+ }
+ // if (!f->inocache->nlink) {
+ // D1(printk(KERN_DEBUG "jffs2_clear_inode() deleting inode #%lu\n", inode->i_ino));
+ // jffs2_del_ino_cache(JFFS2_SB_INFO(inode->i_sb), f->inocache);
+ // jffs2_free_inode_cache(f->inocache);
+ // }
+};
+
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)