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![David Woodhouse](/assets/img/avatar_default.png)
As the first step towards eliminating the ref->next_phys member and saving memory by using an _array_ of struct jffs2_raw_node_ref per eraseblock, stop the write functions from allocating their own refs; have them just _reserve_ the appropriate number instead. Then jffs2_link_node_ref() can just fill them in. Use a linked list of pre-allocated refs in the superblock, for now. Once we switch to an array, it'll just be a case of extending that array. Signed-off-by: David Woodhouse <dwmw2@infradead.org>
671 lines
20 KiB
C
671 lines
20 KiB
C
/*
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* JFFS2 -- Journalling Flash File System, Version 2.
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*
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* Copyright (C) 2001-2003 Red Hat, Inc.
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*
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* Created by David Woodhouse <dwmw2@infradead.org>
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*
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* For licensing information, see the file 'LICENCE' in this directory.
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*
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* $Id: write.c,v 1.97 2005/11/07 11:14:42 gleixner Exp $
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*
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*/
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#include <linux/kernel.h>
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#include <linux/fs.h>
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#include <linux/crc32.h>
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#include <linux/slab.h>
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#include <linux/pagemap.h>
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#include <linux/mtd/mtd.h>
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#include "nodelist.h"
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#include "compr.h"
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int jffs2_do_new_inode(struct jffs2_sb_info *c, struct jffs2_inode_info *f, uint32_t mode, struct jffs2_raw_inode *ri)
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{
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struct jffs2_inode_cache *ic;
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ic = jffs2_alloc_inode_cache();
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if (!ic) {
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return -ENOMEM;
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}
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memset(ic, 0, sizeof(*ic));
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f->inocache = ic;
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f->inocache->nlink = 1;
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f->inocache->nodes = (struct jffs2_raw_node_ref *)f->inocache;
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f->inocache->state = INO_STATE_PRESENT;
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jffs2_add_ino_cache(c, f->inocache);
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D1(printk(KERN_DEBUG "jffs2_do_new_inode(): Assigned ino# %d\n", f->inocache->ino));
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ri->ino = cpu_to_je32(f->inocache->ino);
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ri->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
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ri->nodetype = cpu_to_je16(JFFS2_NODETYPE_INODE);
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ri->totlen = cpu_to_je32(PAD(sizeof(*ri)));
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ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
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ri->mode = cpu_to_jemode(mode);
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f->highest_version = 1;
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ri->version = cpu_to_je32(f->highest_version);
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return 0;
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}
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/* jffs2_write_dnode - given a raw_inode, allocate a full_dnode for it,
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write it to the flash, link it into the existing inode/fragment list */
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struct jffs2_full_dnode *jffs2_write_dnode(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
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struct jffs2_raw_inode *ri, const unsigned char *data,
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uint32_t datalen, int alloc_mode)
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{
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struct jffs2_full_dnode *fn;
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size_t retlen;
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uint32_t flash_ofs;
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struct kvec vecs[2];
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int ret;
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int retried = 0;
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unsigned long cnt = 2;
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D1(if(je32_to_cpu(ri->hdr_crc) != crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)) {
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printk(KERN_CRIT "Eep. CRC not correct in jffs2_write_dnode()\n");
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BUG();
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}
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);
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vecs[0].iov_base = ri;
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vecs[0].iov_len = sizeof(*ri);
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vecs[1].iov_base = (unsigned char *)data;
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vecs[1].iov_len = datalen;
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if (je32_to_cpu(ri->totlen) != sizeof(*ri) + datalen) {
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printk(KERN_WARNING "jffs2_write_dnode: ri->totlen (0x%08x) != sizeof(*ri) (0x%08zx) + datalen (0x%08x)\n", je32_to_cpu(ri->totlen), sizeof(*ri), datalen);
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}
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fn = jffs2_alloc_full_dnode();
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if (!fn)
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return ERR_PTR(-ENOMEM);
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/* check number of valid vecs */
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if (!datalen || !data)
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cnt = 1;
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retry:
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flash_ofs = write_ofs(c);
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jffs2_dbg_prewrite_paranoia_check(c, flash_ofs, vecs[0].iov_len + vecs[1].iov_len);
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if ((alloc_mode!=ALLOC_GC) && (je32_to_cpu(ri->version) < f->highest_version)) {
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BUG_ON(!retried);
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D1(printk(KERN_DEBUG "jffs2_write_dnode : dnode_version %d, "
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"highest version %d -> updating dnode\n",
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je32_to_cpu(ri->version), f->highest_version));
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ri->version = cpu_to_je32(++f->highest_version);
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ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
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}
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ret = jffs2_flash_writev(c, vecs, cnt, flash_ofs, &retlen,
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(alloc_mode==ALLOC_GC)?0:f->inocache->ino);
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if (ret || (retlen != sizeof(*ri) + datalen)) {
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printk(KERN_NOTICE "Write of %zd bytes at 0x%08x failed. returned %d, retlen %zd\n",
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sizeof(*ri)+datalen, flash_ofs, ret, retlen);
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/* Mark the space as dirtied */
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if (retlen) {
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/* Don't change raw->size to match retlen. We may have
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written the node header already, and only the data will
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seem corrupted, in which case the scan would skip over
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any node we write before the original intended end of
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this node */
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jffs2_add_physical_node_ref(c, flash_ofs | REF_OBSOLETE, PAD(sizeof(*ri)+datalen), NULL);
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} else {
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printk(KERN_NOTICE "Not marking the space at 0x%08x as dirty because the flash driver returned retlen zero\n", flash_ofs);
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}
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if (!retried && alloc_mode != ALLOC_NORETRY) {
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/* Try to reallocate space and retry */
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uint32_t dummy;
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struct jffs2_eraseblock *jeb = &c->blocks[flash_ofs / c->sector_size];
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retried = 1;
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D1(printk(KERN_DEBUG "Retrying failed write.\n"));
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jffs2_dbg_acct_sanity_check(c,jeb);
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jffs2_dbg_acct_paranoia_check(c, jeb);
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if (alloc_mode == ALLOC_GC) {
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ret = jffs2_reserve_space_gc(c, sizeof(*ri) + datalen, &dummy,
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JFFS2_SUMMARY_INODE_SIZE);
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} else {
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/* Locking pain */
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up(&f->sem);
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jffs2_complete_reservation(c);
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ret = jffs2_reserve_space(c, sizeof(*ri) + datalen, &dummy,
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alloc_mode, JFFS2_SUMMARY_INODE_SIZE);
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down(&f->sem);
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}
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if (!ret) {
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flash_ofs = write_ofs(c);
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D1(printk(KERN_DEBUG "Allocated space at 0x%08x to retry failed write.\n", flash_ofs));
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jffs2_dbg_acct_sanity_check(c,jeb);
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jffs2_dbg_acct_paranoia_check(c, jeb);
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goto retry;
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}
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D1(printk(KERN_DEBUG "Failed to allocate space to retry failed write: %d!\n", ret));
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}
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/* Release the full_dnode which is now useless, and return */
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jffs2_free_full_dnode(fn);
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return ERR_PTR(ret?ret:-EIO);
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}
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/* Mark the space used */
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/* If node covers at least a whole page, or if it starts at the
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beginning of a page and runs to the end of the file, or if
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it's a hole node, mark it REF_PRISTINE, else REF_NORMAL.
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*/
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if ((je32_to_cpu(ri->dsize) >= PAGE_CACHE_SIZE) ||
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( ((je32_to_cpu(ri->offset)&(PAGE_CACHE_SIZE-1))==0) &&
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(je32_to_cpu(ri->dsize)+je32_to_cpu(ri->offset) == je32_to_cpu(ri->isize)))) {
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flash_ofs |= REF_PRISTINE;
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} else {
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flash_ofs |= REF_NORMAL;
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}
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fn->raw = jffs2_add_physical_node_ref(c, flash_ofs, PAD(sizeof(*ri)+datalen), f->inocache);
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fn->ofs = je32_to_cpu(ri->offset);
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fn->size = je32_to_cpu(ri->dsize);
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fn->frags = 0;
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D1(printk(KERN_DEBUG "jffs2_write_dnode wrote node at 0x%08x(%d) with dsize 0x%x, csize 0x%x, node_crc 0x%08x, data_crc 0x%08x, totlen 0x%08x\n",
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flash_ofs & ~3, flash_ofs & 3, je32_to_cpu(ri->dsize),
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je32_to_cpu(ri->csize), je32_to_cpu(ri->node_crc),
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je32_to_cpu(ri->data_crc), je32_to_cpu(ri->totlen)));
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if (retried) {
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jffs2_dbg_acct_sanity_check(c,NULL);
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}
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return fn;
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}
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struct jffs2_full_dirent *jffs2_write_dirent(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
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struct jffs2_raw_dirent *rd, const unsigned char *name,
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uint32_t namelen, int alloc_mode)
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{
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struct jffs2_full_dirent *fd;
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size_t retlen;
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struct kvec vecs[2];
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uint32_t flash_ofs;
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int retried = 0;
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int ret;
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D1(printk(KERN_DEBUG "jffs2_write_dirent(ino #%u, name at *0x%p \"%s\"->ino #%u, name_crc 0x%08x)\n",
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je32_to_cpu(rd->pino), name, name, je32_to_cpu(rd->ino),
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je32_to_cpu(rd->name_crc)));
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D1(if(je32_to_cpu(rd->hdr_crc) != crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)) {
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printk(KERN_CRIT "Eep. CRC not correct in jffs2_write_dirent()\n");
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BUG();
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});
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vecs[0].iov_base = rd;
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vecs[0].iov_len = sizeof(*rd);
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vecs[1].iov_base = (unsigned char *)name;
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vecs[1].iov_len = namelen;
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fd = jffs2_alloc_full_dirent(namelen+1);
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if (!fd)
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return ERR_PTR(-ENOMEM);
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fd->version = je32_to_cpu(rd->version);
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fd->ino = je32_to_cpu(rd->ino);
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fd->nhash = full_name_hash(name, strlen(name));
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fd->type = rd->type;
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memcpy(fd->name, name, namelen);
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fd->name[namelen]=0;
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retry:
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flash_ofs = write_ofs(c);
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jffs2_dbg_prewrite_paranoia_check(c, flash_ofs, vecs[0].iov_len + vecs[1].iov_len);
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if ((alloc_mode!=ALLOC_GC) && (je32_to_cpu(rd->version) < f->highest_version)) {
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BUG_ON(!retried);
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D1(printk(KERN_DEBUG "jffs2_write_dirent : dirent_version %d, "
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"highest version %d -> updating dirent\n",
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je32_to_cpu(rd->version), f->highest_version));
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rd->version = cpu_to_je32(++f->highest_version);
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fd->version = je32_to_cpu(rd->version);
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rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
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}
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ret = jffs2_flash_writev(c, vecs, 2, flash_ofs, &retlen,
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(alloc_mode==ALLOC_GC)?0:je32_to_cpu(rd->pino));
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if (ret || (retlen != sizeof(*rd) + namelen)) {
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printk(KERN_NOTICE "Write of %zd bytes at 0x%08x failed. returned %d, retlen %zd\n",
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sizeof(*rd)+namelen, flash_ofs, ret, retlen);
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/* Mark the space as dirtied */
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if (retlen) {
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jffs2_add_physical_node_ref(c, flash_ofs | REF_OBSOLETE, PAD(sizeof(*rd)+namelen), NULL);
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} else {
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printk(KERN_NOTICE "Not marking the space at 0x%08x as dirty because the flash driver returned retlen zero\n", flash_ofs);
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}
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if (!retried) {
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/* Try to reallocate space and retry */
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uint32_t dummy;
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struct jffs2_eraseblock *jeb = &c->blocks[flash_ofs / c->sector_size];
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retried = 1;
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D1(printk(KERN_DEBUG "Retrying failed write.\n"));
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jffs2_dbg_acct_sanity_check(c,jeb);
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jffs2_dbg_acct_paranoia_check(c, jeb);
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if (alloc_mode == ALLOC_GC) {
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ret = jffs2_reserve_space_gc(c, sizeof(*rd) + namelen, &dummy,
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JFFS2_SUMMARY_DIRENT_SIZE(namelen));
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} else {
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/* Locking pain */
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up(&f->sem);
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jffs2_complete_reservation(c);
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ret = jffs2_reserve_space(c, sizeof(*rd) + namelen, &dummy,
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alloc_mode, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
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down(&f->sem);
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}
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if (!ret) {
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flash_ofs = write_ofs(c);
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D1(printk(KERN_DEBUG "Allocated space at 0x%08x to retry failed write.\n", flash_ofs));
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jffs2_dbg_acct_sanity_check(c,jeb);
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jffs2_dbg_acct_paranoia_check(c, jeb);
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goto retry;
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}
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D1(printk(KERN_DEBUG "Failed to allocate space to retry failed write: %d!\n", ret));
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}
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/* Release the full_dnode which is now useless, and return */
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jffs2_free_full_dirent(fd);
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return ERR_PTR(ret?ret:-EIO);
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}
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/* Mark the space used */
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fd->raw = jffs2_add_physical_node_ref(c, flash_ofs | REF_PRISTINE, PAD(sizeof(*rd)+namelen), f->inocache);
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if (retried) {
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jffs2_dbg_acct_sanity_check(c,NULL);
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}
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return fd;
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}
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/* The OS-specific code fills in the metadata in the jffs2_raw_inode for us, so that
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we don't have to go digging in struct inode or its equivalent. It should set:
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mode, uid, gid, (starting)isize, atime, ctime, mtime */
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int jffs2_write_inode_range(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
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struct jffs2_raw_inode *ri, unsigned char *buf,
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uint32_t offset, uint32_t writelen, uint32_t *retlen)
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{
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int ret = 0;
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uint32_t writtenlen = 0;
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D1(printk(KERN_DEBUG "jffs2_write_inode_range(): Ino #%u, ofs 0x%x, len 0x%x\n",
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f->inocache->ino, offset, writelen));
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while(writelen) {
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struct jffs2_full_dnode *fn;
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unsigned char *comprbuf = NULL;
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uint16_t comprtype = JFFS2_COMPR_NONE;
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uint32_t alloclen;
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uint32_t datalen, cdatalen;
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int retried = 0;
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retry:
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D2(printk(KERN_DEBUG "jffs2_commit_write() loop: 0x%x to write to 0x%x\n", writelen, offset));
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ret = jffs2_reserve_space(c, sizeof(*ri) + JFFS2_MIN_DATA_LEN,
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&alloclen, ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
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if (ret) {
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D1(printk(KERN_DEBUG "jffs2_reserve_space returned %d\n", ret));
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break;
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}
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down(&f->sem);
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datalen = min_t(uint32_t, writelen, PAGE_CACHE_SIZE - (offset & (PAGE_CACHE_SIZE-1)));
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cdatalen = min_t(uint32_t, alloclen - sizeof(*ri), datalen);
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comprtype = jffs2_compress(c, f, buf, &comprbuf, &datalen, &cdatalen);
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ri->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
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ri->nodetype = cpu_to_je16(JFFS2_NODETYPE_INODE);
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ri->totlen = cpu_to_je32(sizeof(*ri) + cdatalen);
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ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
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ri->ino = cpu_to_je32(f->inocache->ino);
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ri->version = cpu_to_je32(++f->highest_version);
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ri->isize = cpu_to_je32(max(je32_to_cpu(ri->isize), offset + datalen));
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ri->offset = cpu_to_je32(offset);
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ri->csize = cpu_to_je32(cdatalen);
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ri->dsize = cpu_to_je32(datalen);
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ri->compr = comprtype & 0xff;
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ri->usercompr = (comprtype >> 8 ) & 0xff;
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ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
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ri->data_crc = cpu_to_je32(crc32(0, comprbuf, cdatalen));
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fn = jffs2_write_dnode(c, f, ri, comprbuf, cdatalen, ALLOC_NORETRY);
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jffs2_free_comprbuf(comprbuf, buf);
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if (IS_ERR(fn)) {
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ret = PTR_ERR(fn);
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up(&f->sem);
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jffs2_complete_reservation(c);
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if (!retried) {
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/* Write error to be retried */
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retried = 1;
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D1(printk(KERN_DEBUG "Retrying node write in jffs2_write_inode_range()\n"));
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goto retry;
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}
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break;
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}
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ret = jffs2_add_full_dnode_to_inode(c, f, fn);
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if (f->metadata) {
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jffs2_mark_node_obsolete(c, f->metadata->raw);
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jffs2_free_full_dnode(f->metadata);
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f->metadata = NULL;
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}
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if (ret) {
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/* Eep */
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D1(printk(KERN_DEBUG "Eep. add_full_dnode_to_inode() failed in commit_write, returned %d\n", ret));
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jffs2_mark_node_obsolete(c, fn->raw);
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jffs2_free_full_dnode(fn);
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up(&f->sem);
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jffs2_complete_reservation(c);
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break;
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}
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up(&f->sem);
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jffs2_complete_reservation(c);
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if (!datalen) {
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printk(KERN_WARNING "Eep. We didn't actually write any data in jffs2_write_inode_range()\n");
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ret = -EIO;
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break;
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}
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D1(printk(KERN_DEBUG "increasing writtenlen by %d\n", datalen));
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writtenlen += datalen;
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offset += datalen;
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writelen -= datalen;
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buf += datalen;
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}
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*retlen = writtenlen;
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return ret;
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}
|
|
|
|
int jffs2_do_create(struct jffs2_sb_info *c, struct jffs2_inode_info *dir_f, struct jffs2_inode_info *f, struct jffs2_raw_inode *ri, const char *name, int namelen)
|
|
{
|
|
struct jffs2_raw_dirent *rd;
|
|
struct jffs2_full_dnode *fn;
|
|
struct jffs2_full_dirent *fd;
|
|
uint32_t alloclen;
|
|
int ret;
|
|
|
|
/* Try to reserve enough space for both node and dirent.
|
|
* Just the node will do for now, though
|
|
*/
|
|
ret = jffs2_reserve_space(c, sizeof(*ri), &alloclen, ALLOC_NORMAL,
|
|
JFFS2_SUMMARY_INODE_SIZE);
|
|
D1(printk(KERN_DEBUG "jffs2_do_create(): reserved 0x%x bytes\n", alloclen));
|
|
if (ret) {
|
|
up(&f->sem);
|
|
return ret;
|
|
}
|
|
|
|
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, ALLOC_NORMAL);
|
|
|
|
D1(printk(KERN_DEBUG "jffs2_do_create created file with mode 0x%x\n",
|
|
jemode_to_cpu(ri->mode)));
|
|
|
|
if (IS_ERR(fn)) {
|
|
D1(printk(KERN_DEBUG "jffs2_write_dnode() failed\n"));
|
|
/* Eeek. Wave bye bye */
|
|
up(&f->sem);
|
|
jffs2_complete_reservation(c);
|
|
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, &alloclen,
|
|
ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
|
|
|
|
if (ret) {
|
|
/* Eep. */
|
|
D1(printk(KERN_DEBUG "jffs2_reserve_space() for dirent failed\n"));
|
|
return ret;
|
|
}
|
|
|
|
rd = jffs2_alloc_raw_dirent();
|
|
if (!rd) {
|
|
/* Argh. Now we treat it like a normal delete */
|
|
jffs2_complete_reservation(c);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
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_f->inocache->ino);
|
|
rd->version = cpu_to_je32(++dir_f->highest_version);
|
|
rd->ino = ri->ino;
|
|
rd->mctime = ri->ctime;
|
|
rd->nsize = namelen;
|
|
rd->type = DT_REG;
|
|
rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
|
|
rd->name_crc = cpu_to_je32(crc32(0, name, namelen));
|
|
|
|
fd = jffs2_write_dirent(c, dir_f, rd, name, namelen, ALLOC_NORMAL);
|
|
|
|
jffs2_free_raw_dirent(rd);
|
|
|
|
if (IS_ERR(fd)) {
|
|
/* dirent failed to write. Delete the inode normally
|
|
as if it were the final unlink() */
|
|
jffs2_complete_reservation(c);
|
|
up(&dir_f->sem);
|
|
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);
|
|
|
|
jffs2_complete_reservation(c);
|
|
up(&dir_f->sem);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
int jffs2_do_unlink(struct jffs2_sb_info *c, struct jffs2_inode_info *dir_f,
|
|
const char *name, int namelen, struct jffs2_inode_info *dead_f,
|
|
uint32_t time)
|
|
{
|
|
struct jffs2_raw_dirent *rd;
|
|
struct jffs2_full_dirent *fd;
|
|
uint32_t alloclen;
|
|
int ret;
|
|
|
|
if (1 /* alternative branch needs testing */ ||
|
|
!jffs2_can_mark_obsolete(c)) {
|
|
/* We can't mark stuff obsolete on the medium. We need to write a deletion dirent */
|
|
|
|
rd = jffs2_alloc_raw_dirent();
|
|
if (!rd)
|
|
return -ENOMEM;
|
|
|
|
ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
|
|
ALLOC_DELETION, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
|
|
if (ret) {
|
|
jffs2_free_raw_dirent(rd);
|
|
return ret;
|
|
}
|
|
|
|
down(&dir_f->sem);
|
|
|
|
/* Build a deletion node */
|
|
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_f->inocache->ino);
|
|
rd->version = cpu_to_je32(++dir_f->highest_version);
|
|
rd->ino = cpu_to_je32(0);
|
|
rd->mctime = cpu_to_je32(time);
|
|
rd->nsize = namelen;
|
|
rd->type = DT_UNKNOWN;
|
|
rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
|
|
rd->name_crc = cpu_to_je32(crc32(0, name, namelen));
|
|
|
|
fd = jffs2_write_dirent(c, dir_f, rd, name, namelen, ALLOC_DELETION);
|
|
|
|
jffs2_free_raw_dirent(rd);
|
|
|
|
if (IS_ERR(fd)) {
|
|
jffs2_complete_reservation(c);
|
|
up(&dir_f->sem);
|
|
return PTR_ERR(fd);
|
|
}
|
|
|
|
/* File it. This will mark the old one obsolete. */
|
|
jffs2_add_fd_to_list(c, fd, &dir_f->dents);
|
|
up(&dir_f->sem);
|
|
} else {
|
|
struct jffs2_full_dirent **prev = &dir_f->dents;
|
|
uint32_t nhash = full_name_hash(name, namelen);
|
|
|
|
down(&dir_f->sem);
|
|
|
|
while ((*prev) && (*prev)->nhash <= nhash) {
|
|
if ((*prev)->nhash == nhash &&
|
|
!memcmp((*prev)->name, name, namelen) &&
|
|
!(*prev)->name[namelen]) {
|
|
struct jffs2_full_dirent *this = *prev;
|
|
|
|
D1(printk(KERN_DEBUG "Marking old dirent node (ino #%u) @%08x obsolete\n",
|
|
this->ino, ref_offset(this->raw)));
|
|
|
|
*prev = this->next;
|
|
jffs2_mark_node_obsolete(c, (this->raw));
|
|
jffs2_free_full_dirent(this);
|
|
break;
|
|
}
|
|
prev = &((*prev)->next);
|
|
}
|
|
up(&dir_f->sem);
|
|
}
|
|
|
|
/* dead_f is NULL if this was a rename not a real unlink */
|
|
/* Also catch the !f->inocache case, where there was a dirent
|
|
pointing to an inode which didn't exist. */
|
|
if (dead_f && dead_f->inocache) {
|
|
|
|
down(&dead_f->sem);
|
|
|
|
if (S_ISDIR(OFNI_EDONI_2SFFJ(dead_f)->i_mode)) {
|
|
while (dead_f->dents) {
|
|
/* There can be only deleted ones */
|
|
fd = dead_f->dents;
|
|
|
|
dead_f->dents = fd->next;
|
|
|
|
if (fd->ino) {
|
|
printk(KERN_WARNING "Deleting inode #%u with active dentry \"%s\"->ino #%u\n",
|
|
dead_f->inocache->ino, fd->name, fd->ino);
|
|
} else {
|
|
D1(printk(KERN_DEBUG "Removing deletion dirent for \"%s\" from dir ino #%u\n",
|
|
fd->name, dead_f->inocache->ino));
|
|
}
|
|
jffs2_mark_node_obsolete(c, fd->raw);
|
|
jffs2_free_full_dirent(fd);
|
|
}
|
|
}
|
|
|
|
dead_f->inocache->nlink--;
|
|
/* NB: Caller must set inode nlink if appropriate */
|
|
up(&dead_f->sem);
|
|
}
|
|
|
|
jffs2_complete_reservation(c);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
int jffs2_do_link (struct jffs2_sb_info *c, struct jffs2_inode_info *dir_f, uint32_t ino, uint8_t type, const char *name, int namelen, uint32_t time)
|
|
{
|
|
struct jffs2_raw_dirent *rd;
|
|
struct jffs2_full_dirent *fd;
|
|
uint32_t alloclen;
|
|
int ret;
|
|
|
|
rd = jffs2_alloc_raw_dirent();
|
|
if (!rd)
|
|
return -ENOMEM;
|
|
|
|
ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
|
|
ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
|
|
if (ret) {
|
|
jffs2_free_raw_dirent(rd);
|
|
return ret;
|
|
}
|
|
|
|
down(&dir_f->sem);
|
|
|
|
/* Build a deletion node */
|
|
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_f->inocache->ino);
|
|
rd->version = cpu_to_je32(++dir_f->highest_version);
|
|
rd->ino = cpu_to_je32(ino);
|
|
rd->mctime = cpu_to_je32(time);
|
|
rd->nsize = namelen;
|
|
|
|
rd->type = type;
|
|
|
|
rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
|
|
rd->name_crc = cpu_to_je32(crc32(0, name, namelen));
|
|
|
|
fd = jffs2_write_dirent(c, dir_f, rd, name, namelen, ALLOC_NORMAL);
|
|
|
|
jffs2_free_raw_dirent(rd);
|
|
|
|
if (IS_ERR(fd)) {
|
|
jffs2_complete_reservation(c);
|
|
up(&dir_f->sem);
|
|
return PTR_ERR(fd);
|
|
}
|
|
|
|
/* File it. This will mark the old one obsolete. */
|
|
jffs2_add_fd_to_list(c, fd, &dir_f->dents);
|
|
|
|
jffs2_complete_reservation(c);
|
|
up(&dir_f->sem);
|
|
|
|
return 0;
|
|
}
|