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723 lines
21 KiB
723 lines
21 KiB
/* |
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* JFFS2 -- Journalling Flash File System, Version 2. |
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* |
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* Copyright © 2001-2007 Red Hat, Inc. |
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* |
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* Created by David Woodhouse <[email protected]> |
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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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*/ |
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|
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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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/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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|
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int jffs2_do_new_inode(struct jffs2_sb_info *c, struct jffs2_inode_info *f, |
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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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|
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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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|
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memset(ic, 0, sizeof(*ic)); |
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|
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f->inocache = ic; |
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f->inocache->pino_nlink = 1; /* Will be overwritten shortly for directories */ |
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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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|
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jffs2_add_ino_cache(c, f->inocache); |
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jffs2_dbg(1, "%s(): Assigned ino# %d\n", __func__, f->inocache->ino); |
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ri->ino = cpu_to_je32(f->inocache->ino); |
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|
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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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|
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f->highest_version = 1; |
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ri->version = cpu_to_je32(f->highest_version); |
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|
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return 0; |
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} |
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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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|
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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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{ |
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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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|
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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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pr_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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|
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if (je32_to_cpu(ri->totlen) != sizeof(*ri) + datalen) { |
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pr_warn("%s(): ri->totlen (0x%08x) != sizeof(*ri) (0x%08zx) + datalen (0x%08x)\n", |
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__func__, je32_to_cpu(ri->totlen), |
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sizeof(*ri), datalen); |
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} |
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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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|
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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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|
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jffs2_dbg_prewrite_paranoia_check(c, flash_ofs, vecs[0].iov_len + vecs[1].iov_len); |
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|
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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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jffs2_dbg(1, "%s(): dnode_version %d, highest version %d -> updating dnode\n", |
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__func__, |
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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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|
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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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|
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if (ret || (retlen != sizeof(*ri) + datalen)) { |
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pr_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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|
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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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pr_notice("Not marking the space at 0x%08x as dirty because the flash driver returned retlen zero\n", |
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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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|
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retried = 1; |
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|
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jffs2_dbg(1, "Retrying failed write.\n"); |
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|
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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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|
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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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mutex_unlock(&f->sem); |
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jffs2_complete_reservation(c); |
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|
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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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mutex_lock(&f->sem); |
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} |
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|
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if (!ret) { |
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flash_ofs = write_ofs(c); |
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jffs2_dbg(1, "Allocated space at 0x%08x to retry failed write.\n", |
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flash_ofs); |
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|
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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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|
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goto retry; |
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} |
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jffs2_dbg(1, "Failed to allocate space to retry failed write: %d!\n", |
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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_SIZE) || |
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( ((je32_to_cpu(ri->offset)&(PAGE_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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if (IS_ERR(fn->raw)) { |
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void *hold_err = fn->raw; |
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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_CAST(hold_err); |
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} |
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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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|
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jffs2_dbg(1, "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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|
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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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|
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return fn; |
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} |
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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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|
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jffs2_dbg(1, "%s(ino #%u, name at *0x%p \"%s\"->ino #%u, name_crc 0x%08x)\n", |
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__func__, |
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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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|
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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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pr_crit("Eep. CRC not correct in jffs2_write_dirent()\n"); |
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BUG(); |
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}); |
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|
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if (strnlen(name, namelen) != namelen) { |
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/* This should never happen, but seems to have done on at least one |
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occasion: https://dev.laptop.org/ticket/4184 */ |
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pr_crit("Error in jffs2_write_dirent() -- name contains zero bytes!\n"); |
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pr_crit("Directory inode #%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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WARN_ON(1); |
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return ERR_PTR(-EIO); |
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} |
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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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|
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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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|
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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(NULL, name, namelen); |
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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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|
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retry: |
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flash_ofs = write_ofs(c); |
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|
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jffs2_dbg_prewrite_paranoia_check(c, flash_ofs, vecs[0].iov_len + vecs[1].iov_len); |
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|
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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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jffs2_dbg(1, "%s(): dirent_version %d, highest version %d -> updating dirent\n", |
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__func__, |
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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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|
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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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pr_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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pr_notice("Not marking the space at 0x%08x as dirty because the flash driver returned retlen zero\n", |
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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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|
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retried = 1; |
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|
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jffs2_dbg(1, "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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mutex_unlock(&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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mutex_lock(&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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jffs2_dbg(1, "Allocated space at 0x%08x to retry failed write\n", |
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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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jffs2_dbg(1, "Failed to allocate space to retry failed write: %d!\n", |
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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 | dirent_node_state(rd), |
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PAD(sizeof(*rd)+namelen), f->inocache); |
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if (IS_ERR(fd->raw)) { |
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void *hold_err = fd->raw; |
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/* Release the full_dirent which is now useless, and return */ |
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jffs2_free_full_dirent(fd); |
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return ERR_CAST(hold_err); |
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} |
|
|
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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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|
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jffs2_dbg(1, "%s(): Ino #%u, ofs 0x%x, len 0x%x\n", |
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__func__, 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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jffs2_dbg(2, "jffs2_commit_write() loop: 0x%x to write to 0x%x\n", |
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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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jffs2_dbg(1, "jffs2_reserve_space returned %d\n", ret); |
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break; |
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} |
|
mutex_lock(&f->sem); |
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datalen = min_t(uint32_t, writelen, |
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PAGE_SIZE - (offset & (PAGE_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); |
|
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); |
|
ri->version = cpu_to_je32(++f->highest_version); |
|
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); |
|
ri->dsize = cpu_to_je32(datalen); |
|
ri->compr = comprtype & 0xff; |
|
ri->usercompr = (comprtype >> 8 ) & 0xff; |
|
ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); |
|
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); |
|
|
|
jffs2_free_comprbuf(comprbuf, buf); |
|
|
|
if (IS_ERR(fn)) { |
|
ret = PTR_ERR(fn); |
|
mutex_unlock(&f->sem); |
|
jffs2_complete_reservation(c); |
|
if (!retried) { |
|
/* Write error to be retried */ |
|
retried = 1; |
|
jffs2_dbg(1, "Retrying node write in jffs2_write_inode_range()\n"); |
|
goto retry; |
|
} |
|
break; |
|
} |
|
ret = jffs2_add_full_dnode_to_inode(c, f, fn); |
|
if (f->metadata) { |
|
jffs2_mark_node_obsolete(c, f->metadata->raw); |
|
jffs2_free_full_dnode(f->metadata); |
|
f->metadata = NULL; |
|
} |
|
if (ret) { |
|
/* Eep */ |
|
jffs2_dbg(1, "Eep. add_full_dnode_to_inode() failed in commit_write, returned %d\n", |
|
ret); |
|
jffs2_mark_node_obsolete(c, fn->raw); |
|
jffs2_free_full_dnode(fn); |
|
|
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mutex_unlock(&f->sem); |
|
jffs2_complete_reservation(c); |
|
break; |
|
} |
|
mutex_unlock(&f->sem); |
|
jffs2_complete_reservation(c); |
|
if (!datalen) { |
|
pr_warn("Eep. We didn't actually write any data in jffs2_write_inode_range()\n"); |
|
ret = -EIO; |
|
break; |
|
} |
|
jffs2_dbg(1, "increasing writtenlen by %d\n", datalen); |
|
writtenlen += datalen; |
|
offset += datalen; |
|
writelen -= datalen; |
|
buf += datalen; |
|
} |
|
*retlen = writtenlen; |
|
return ret; |
|
} |
|
|
|
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 struct qstr *qstr) |
|
{ |
|
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); |
|
jffs2_dbg(1, "%s(): reserved 0x%x bytes\n", __func__, alloclen); |
|
if (ret) |
|
return ret; |
|
|
|
mutex_lock(&f->sem); |
|
|
|
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); |
|
|
|
jffs2_dbg(1, "jffs2_do_create created file with mode 0x%x\n", |
|
jemode_to_cpu(ri->mode)); |
|
|
|
if (IS_ERR(fn)) { |
|
jffs2_dbg(1, "jffs2_write_dnode() failed\n"); |
|
/* Eeek. Wave bye bye */ |
|
mutex_unlock(&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; |
|
|
|
mutex_unlock(&f->sem); |
|
jffs2_complete_reservation(c); |
|
|
|
ret = jffs2_init_security(&f->vfs_inode, &dir_f->vfs_inode, qstr); |
|
if (ret) |
|
return ret; |
|
ret = jffs2_init_acl_post(&f->vfs_inode); |
|
if (ret) |
|
return ret; |
|
|
|
ret = jffs2_reserve_space(c, sizeof(*rd)+qstr->len, &alloclen, |
|
ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(qstr->len)); |
|
|
|
if (ret) { |
|
/* Eep. */ |
|
jffs2_dbg(1, "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; |
|
} |
|
|
|
mutex_lock(&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) + qstr->len); |
|
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 = qstr->len; |
|
rd->type = DT_REG; |
|
rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); |
|
rd->name_crc = cpu_to_je32(crc32(0, qstr->name, qstr->len)); |
|
|
|
fd = jffs2_write_dirent(c, dir_f, rd, qstr->name, qstr->len, 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); |
|
mutex_unlock(&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); |
|
mutex_unlock(&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 (!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; |
|
} |
|
|
|
mutex_lock(&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); |
|
mutex_unlock(&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); |
|
mutex_unlock(&dir_f->sem); |
|
} else { |
|
uint32_t nhash = full_name_hash(NULL, name, namelen); |
|
|
|
fd = dir_f->dents; |
|
/* We don't actually want to reserve any space, but we do |
|
want to be holding the alloc_sem when we write to flash */ |
|
mutex_lock(&c->alloc_sem); |
|
mutex_lock(&dir_f->sem); |
|
|
|
for (fd = dir_f->dents; fd; fd = fd->next) { |
|
if (fd->nhash == nhash && |
|
!memcmp(fd->name, name, namelen) && |
|
!fd->name[namelen]) { |
|
|
|
jffs2_dbg(1, "Marking old dirent node (ino #%u) @%08x obsolete\n", |
|
fd->ino, ref_offset(fd->raw)); |
|
jffs2_mark_node_obsolete(c, fd->raw); |
|
/* We don't want to remove it from the list immediately, |
|
because that screws up getdents()/seek() semantics even |
|
more than they're screwed already. Turn it into a |
|
node-less deletion dirent instead -- a placeholder */ |
|
fd->raw = NULL; |
|
fd->ino = 0; |
|
break; |
|
} |
|
} |
|
mutex_unlock(&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) { |
|
|
|
mutex_lock(&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) { |
|
pr_warn("Deleting inode #%u with active dentry \"%s\"->ino #%u\n", |
|
dead_f->inocache->ino, |
|
fd->name, fd->ino); |
|
} else { |
|
jffs2_dbg(1, "Removing deletion dirent for \"%s\" from dir ino #%u\n", |
|
fd->name, |
|
dead_f->inocache->ino); |
|
} |
|
if (fd->raw) |
|
jffs2_mark_node_obsolete(c, fd->raw); |
|
jffs2_free_full_dirent(fd); |
|
} |
|
dead_f->inocache->pino_nlink = 0; |
|
} else |
|
dead_f->inocache->pino_nlink--; |
|
/* NB: Caller must set inode nlink if appropriate */ |
|
mutex_unlock(&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; |
|
} |
|
|
|
mutex_lock(&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); |
|
mutex_unlock(&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); |
|
mutex_unlock(&dir_f->sem); |
|
|
|
return 0; |
|
}
|
|
|