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1347 lines
38 KiB
1347 lines
38 KiB
/* |
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* JFFS2 -- Journalling Flash File System, Version 2. |
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* |
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* Copyright © 2006 NEC Corporation |
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* |
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* Created by KaiGai Kohei <[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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#define JFFS2_XATTR_IS_CORRUPTED 1 |
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|
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#include <linux/kernel.h> |
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#include <linux/slab.h> |
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#include <linux/fs.h> |
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#include <linux/time.h> |
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#include <linux/pagemap.h> |
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#include <linux/highmem.h> |
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#include <linux/crc32.h> |
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#include <linux/jffs2.h> |
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#include <linux/xattr.h> |
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#include <linux/posix_acl_xattr.h> |
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#include <linux/mtd/mtd.h> |
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#include "nodelist.h" |
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/* -------- xdatum related functions ---------------- |
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* xattr_datum_hashkey(xprefix, xname, xvalue, xsize) |
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* is used to calcurate xdatum hashkey. The reminder of hashkey into XATTRINDEX_HASHSIZE is |
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* the index of the xattr name/value pair cache (c->xattrindex). |
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* is_xattr_datum_unchecked(c, xd) |
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* returns 1, if xdatum contains any unchecked raw nodes. if all raw nodes are not |
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* unchecked, it returns 0. |
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* unload_xattr_datum(c, xd) |
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* is used to release xattr name/value pair and detach from c->xattrindex. |
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* reclaim_xattr_datum(c) |
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* is used to reclaim xattr name/value pairs on the xattr name/value pair cache when |
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* memory usage by cache is over c->xdatum_mem_threshold. Currently, this threshold |
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* is hard coded as 32KiB. |
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* do_verify_xattr_datum(c, xd) |
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* is used to load the xdatum informations without name/value pair from the medium. |
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* It's necessary once, because those informations are not collected during mounting |
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* process when EBS is enabled. |
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* 0 will be returned, if success. An negative return value means recoverable error, and |
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* positive return value means unrecoverable error. Thus, caller must remove this xdatum |
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* and xref when it returned positive value. |
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* do_load_xattr_datum(c, xd) |
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* is used to load name/value pair from the medium. |
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* The meanings of return value is same as do_verify_xattr_datum(). |
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* load_xattr_datum(c, xd) |
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* is used to be as a wrapper of do_verify_xattr_datum() and do_load_xattr_datum(). |
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* If xd need to call do_verify_xattr_datum() at first, it's called before calling |
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* do_load_xattr_datum(). The meanings of return value is same as do_verify_xattr_datum(). |
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* save_xattr_datum(c, xd) |
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* is used to write xdatum to medium. xd->version will be incremented. |
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* create_xattr_datum(c, xprefix, xname, xvalue, xsize) |
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* is used to create new xdatum and write to medium. |
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* unrefer_xattr_datum(c, xd) |
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* is used to delete a xdatum. When nobody refers this xdatum, JFFS2_XFLAGS_DEAD |
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* is set on xd->flags and chained xattr_dead_list or release it immediately. |
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* In the first case, the garbage collector release it later. |
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* -------------------------------------------------- */ |
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static uint32_t xattr_datum_hashkey(int xprefix, const char *xname, const char *xvalue, int xsize) |
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{ |
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int name_len = strlen(xname); |
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|
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return crc32(xprefix, xname, name_len) ^ crc32(xprefix, xvalue, xsize); |
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} |
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static int is_xattr_datum_unchecked(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) |
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{ |
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struct jffs2_raw_node_ref *raw; |
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int rc = 0; |
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|
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spin_lock(&c->erase_completion_lock); |
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for (raw=xd->node; raw != (void *)xd; raw=raw->next_in_ino) { |
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if (ref_flags(raw) == REF_UNCHECKED) { |
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rc = 1; |
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break; |
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} |
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} |
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spin_unlock(&c->erase_completion_lock); |
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return rc; |
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} |
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static void unload_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) |
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{ |
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/* must be called under down_write(xattr_sem) */ |
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D1(dbg_xattr("%s: xid=%u, version=%u\n", __func__, xd->xid, xd->version)); |
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if (xd->xname) { |
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c->xdatum_mem_usage -= (xd->name_len + 1 + xd->value_len); |
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kfree(xd->xname); |
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} |
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list_del_init(&xd->xindex); |
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xd->hashkey = 0; |
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xd->xname = NULL; |
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xd->xvalue = NULL; |
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} |
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static void reclaim_xattr_datum(struct jffs2_sb_info *c) |
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{ |
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/* must be called under down_write(xattr_sem) */ |
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struct jffs2_xattr_datum *xd, *_xd; |
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uint32_t target, before; |
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static int index = 0; |
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int count; |
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|
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if (c->xdatum_mem_threshold > c->xdatum_mem_usage) |
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return; |
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before = c->xdatum_mem_usage; |
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target = c->xdatum_mem_usage * 4 / 5; /* 20% reduction */ |
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for (count = 0; count < XATTRINDEX_HASHSIZE; count++) { |
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list_for_each_entry_safe(xd, _xd, &c->xattrindex[index], xindex) { |
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if (xd->flags & JFFS2_XFLAGS_HOT) { |
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xd->flags &= ~JFFS2_XFLAGS_HOT; |
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} else if (!(xd->flags & JFFS2_XFLAGS_BIND)) { |
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unload_xattr_datum(c, xd); |
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} |
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if (c->xdatum_mem_usage <= target) |
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goto out; |
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} |
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index = (index+1) % XATTRINDEX_HASHSIZE; |
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} |
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out: |
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JFFS2_NOTICE("xdatum_mem_usage from %u byte to %u byte (%u byte reclaimed)\n", |
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before, c->xdatum_mem_usage, before - c->xdatum_mem_usage); |
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} |
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|
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static int do_verify_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) |
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{ |
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/* must be called under down_write(xattr_sem) */ |
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struct jffs2_eraseblock *jeb; |
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struct jffs2_raw_node_ref *raw; |
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struct jffs2_raw_xattr rx; |
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size_t readlen; |
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uint32_t crc, offset, totlen; |
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int rc; |
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spin_lock(&c->erase_completion_lock); |
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offset = ref_offset(xd->node); |
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if (ref_flags(xd->node) == REF_PRISTINE) |
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goto complete; |
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spin_unlock(&c->erase_completion_lock); |
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rc = jffs2_flash_read(c, offset, sizeof(rx), &readlen, (char *)&rx); |
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if (rc || readlen != sizeof(rx)) { |
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JFFS2_WARNING("jffs2_flash_read()=%d, req=%zu, read=%zu at %#08x\n", |
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rc, sizeof(rx), readlen, offset); |
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return rc ? rc : -EIO; |
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} |
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crc = crc32(0, &rx, sizeof(rx) - 4); |
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if (crc != je32_to_cpu(rx.node_crc)) { |
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JFFS2_ERROR("node CRC failed at %#08x, read=%#08x, calc=%#08x\n", |
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offset, je32_to_cpu(rx.hdr_crc), crc); |
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xd->flags |= JFFS2_XFLAGS_INVALID; |
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return JFFS2_XATTR_IS_CORRUPTED; |
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} |
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totlen = PAD(sizeof(rx) + rx.name_len + 1 + je16_to_cpu(rx.value_len)); |
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if (je16_to_cpu(rx.magic) != JFFS2_MAGIC_BITMASK |
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|| je16_to_cpu(rx.nodetype) != JFFS2_NODETYPE_XATTR |
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|| je32_to_cpu(rx.totlen) != totlen |
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|| je32_to_cpu(rx.xid) != xd->xid |
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|| je32_to_cpu(rx.version) != xd->version) { |
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JFFS2_ERROR("inconsistent xdatum at %#08x, magic=%#04x/%#04x, " |
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"nodetype=%#04x/%#04x, totlen=%u/%u, xid=%u/%u, version=%u/%u\n", |
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offset, je16_to_cpu(rx.magic), JFFS2_MAGIC_BITMASK, |
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je16_to_cpu(rx.nodetype), JFFS2_NODETYPE_XATTR, |
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je32_to_cpu(rx.totlen), totlen, |
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je32_to_cpu(rx.xid), xd->xid, |
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je32_to_cpu(rx.version), xd->version); |
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xd->flags |= JFFS2_XFLAGS_INVALID; |
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return JFFS2_XATTR_IS_CORRUPTED; |
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} |
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xd->xprefix = rx.xprefix; |
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xd->name_len = rx.name_len; |
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xd->value_len = je16_to_cpu(rx.value_len); |
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xd->data_crc = je32_to_cpu(rx.data_crc); |
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spin_lock(&c->erase_completion_lock); |
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complete: |
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for (raw=xd->node; raw != (void *)xd; raw=raw->next_in_ino) { |
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jeb = &c->blocks[ref_offset(raw) / c->sector_size]; |
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totlen = PAD(ref_totlen(c, jeb, raw)); |
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if (ref_flags(raw) == REF_UNCHECKED) { |
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c->unchecked_size -= totlen; c->used_size += totlen; |
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jeb->unchecked_size -= totlen; jeb->used_size += totlen; |
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} |
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raw->flash_offset = ref_offset(raw) | ((xd->node==raw) ? REF_PRISTINE : REF_NORMAL); |
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} |
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spin_unlock(&c->erase_completion_lock); |
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/* unchecked xdatum is chained with c->xattr_unchecked */ |
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list_del_init(&xd->xindex); |
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dbg_xattr("success on verifying xdatum (xid=%u, version=%u)\n", |
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xd->xid, xd->version); |
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return 0; |
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} |
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static int do_load_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) |
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{ |
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/* must be called under down_write(xattr_sem) */ |
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char *data; |
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size_t readlen; |
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uint32_t crc, length; |
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int i, ret, retry = 0; |
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BUG_ON(ref_flags(xd->node) != REF_PRISTINE); |
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BUG_ON(!list_empty(&xd->xindex)); |
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retry: |
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length = xd->name_len + 1 + xd->value_len; |
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data = kmalloc(length, GFP_KERNEL); |
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if (!data) |
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return -ENOMEM; |
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ret = jffs2_flash_read(c, ref_offset(xd->node)+sizeof(struct jffs2_raw_xattr), |
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length, &readlen, data); |
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if (ret || length!=readlen) { |
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JFFS2_WARNING("jffs2_flash_read() returned %d, request=%d, readlen=%zu, at %#08x\n", |
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ret, length, readlen, ref_offset(xd->node)); |
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kfree(data); |
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return ret ? ret : -EIO; |
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} |
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data[xd->name_len] = '\0'; |
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crc = crc32(0, data, length); |
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if (crc != xd->data_crc) { |
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JFFS2_WARNING("node CRC failed (JFFS2_NODETYPE_XATTR)" |
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" at %#08x, read: 0x%08x calculated: 0x%08x\n", |
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ref_offset(xd->node), xd->data_crc, crc); |
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kfree(data); |
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xd->flags |= JFFS2_XFLAGS_INVALID; |
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return JFFS2_XATTR_IS_CORRUPTED; |
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} |
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xd->flags |= JFFS2_XFLAGS_HOT; |
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xd->xname = data; |
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xd->xvalue = data + xd->name_len+1; |
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c->xdatum_mem_usage += length; |
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xd->hashkey = xattr_datum_hashkey(xd->xprefix, xd->xname, xd->xvalue, xd->value_len); |
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i = xd->hashkey % XATTRINDEX_HASHSIZE; |
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list_add(&xd->xindex, &c->xattrindex[i]); |
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if (!retry) { |
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retry = 1; |
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reclaim_xattr_datum(c); |
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if (!xd->xname) |
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goto retry; |
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} |
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dbg_xattr("success on loading xdatum (xid=%u, xprefix=%u, xname='%s')\n", |
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xd->xid, xd->xprefix, xd->xname); |
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return 0; |
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} |
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static int load_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) |
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{ |
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/* must be called under down_write(xattr_sem); |
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* rc < 0 : recoverable error, try again |
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* rc = 0 : success |
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* rc > 0 : Unrecoverable error, this node should be deleted. |
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*/ |
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int rc = 0; |
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BUG_ON(xd->flags & JFFS2_XFLAGS_DEAD); |
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if (xd->xname) |
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return 0; |
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if (xd->flags & JFFS2_XFLAGS_INVALID) |
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return JFFS2_XATTR_IS_CORRUPTED; |
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if (unlikely(is_xattr_datum_unchecked(c, xd))) |
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rc = do_verify_xattr_datum(c, xd); |
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if (!rc) |
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rc = do_load_xattr_datum(c, xd); |
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return rc; |
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} |
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static int save_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) |
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{ |
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/* must be called under down_write(xattr_sem) */ |
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struct jffs2_raw_xattr rx; |
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struct kvec vecs[2]; |
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size_t length; |
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int rc, totlen; |
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uint32_t phys_ofs = write_ofs(c); |
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BUG_ON(!xd->xname); |
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BUG_ON(xd->flags & (JFFS2_XFLAGS_DEAD|JFFS2_XFLAGS_INVALID)); |
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vecs[0].iov_base = ℞ |
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vecs[0].iov_len = sizeof(rx); |
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vecs[1].iov_base = xd->xname; |
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vecs[1].iov_len = xd->name_len + 1 + xd->value_len; |
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totlen = vecs[0].iov_len + vecs[1].iov_len; |
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/* Setup raw-xattr */ |
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memset(&rx, 0, sizeof(rx)); |
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rx.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); |
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rx.nodetype = cpu_to_je16(JFFS2_NODETYPE_XATTR); |
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rx.totlen = cpu_to_je32(PAD(totlen)); |
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rx.hdr_crc = cpu_to_je32(crc32(0, &rx, sizeof(struct jffs2_unknown_node) - 4)); |
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rx.xid = cpu_to_je32(xd->xid); |
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rx.version = cpu_to_je32(++xd->version); |
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rx.xprefix = xd->xprefix; |
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rx.name_len = xd->name_len; |
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rx.value_len = cpu_to_je16(xd->value_len); |
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rx.data_crc = cpu_to_je32(crc32(0, vecs[1].iov_base, vecs[1].iov_len)); |
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rx.node_crc = cpu_to_je32(crc32(0, &rx, sizeof(struct jffs2_raw_xattr) - 4)); |
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|
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rc = jffs2_flash_writev(c, vecs, 2, phys_ofs, &length, 0); |
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if (rc || totlen != length) { |
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JFFS2_WARNING("jffs2_flash_writev()=%d, req=%u, wrote=%zu, at %#08x\n", |
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rc, totlen, length, phys_ofs); |
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rc = rc ? rc : -EIO; |
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if (length) |
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jffs2_add_physical_node_ref(c, phys_ofs | REF_OBSOLETE, PAD(totlen), NULL); |
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|
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return rc; |
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} |
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/* success */ |
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jffs2_add_physical_node_ref(c, phys_ofs | REF_PRISTINE, PAD(totlen), (void *)xd); |
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|
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dbg_xattr("success on saving xdatum (xid=%u, version=%u, xprefix=%u, xname='%s')\n", |
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xd->xid, xd->version, xd->xprefix, xd->xname); |
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return 0; |
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} |
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static struct jffs2_xattr_datum *create_xattr_datum(struct jffs2_sb_info *c, |
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int xprefix, const char *xname, |
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const char *xvalue, int xsize) |
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{ |
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/* must be called under down_write(xattr_sem) */ |
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struct jffs2_xattr_datum *xd; |
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uint32_t hashkey, name_len; |
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char *data; |
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int i, rc; |
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|
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/* Search xattr_datum has same xname/xvalue by index */ |
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hashkey = xattr_datum_hashkey(xprefix, xname, xvalue, xsize); |
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i = hashkey % XATTRINDEX_HASHSIZE; |
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list_for_each_entry(xd, &c->xattrindex[i], xindex) { |
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if (xd->hashkey==hashkey |
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&& xd->xprefix==xprefix |
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&& xd->value_len==xsize |
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&& !strcmp(xd->xname, xname) |
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&& !memcmp(xd->xvalue, xvalue, xsize)) { |
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atomic_inc(&xd->refcnt); |
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return xd; |
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} |
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} |
|
|
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/* Not found, Create NEW XATTR-Cache */ |
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name_len = strlen(xname); |
|
|
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xd = jffs2_alloc_xattr_datum(); |
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if (!xd) |
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return ERR_PTR(-ENOMEM); |
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|
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data = kmalloc(name_len + 1 + xsize, GFP_KERNEL); |
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if (!data) { |
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jffs2_free_xattr_datum(xd); |
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return ERR_PTR(-ENOMEM); |
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} |
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strcpy(data, xname); |
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memcpy(data + name_len + 1, xvalue, xsize); |
|
|
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atomic_set(&xd->refcnt, 1); |
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xd->xid = ++c->highest_xid; |
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xd->flags |= JFFS2_XFLAGS_HOT; |
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xd->xprefix = xprefix; |
|
|
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xd->hashkey = hashkey; |
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xd->xname = data; |
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xd->xvalue = data + name_len + 1; |
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xd->name_len = name_len; |
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xd->value_len = xsize; |
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xd->data_crc = crc32(0, data, xd->name_len + 1 + xd->value_len); |
|
|
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rc = save_xattr_datum(c, xd); |
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if (rc) { |
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kfree(xd->xname); |
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jffs2_free_xattr_datum(xd); |
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return ERR_PTR(rc); |
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} |
|
|
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/* Insert Hash Index */ |
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i = hashkey % XATTRINDEX_HASHSIZE; |
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list_add(&xd->xindex, &c->xattrindex[i]); |
|
|
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c->xdatum_mem_usage += (xd->name_len + 1 + xd->value_len); |
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reclaim_xattr_datum(c); |
|
|
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return xd; |
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} |
|
|
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static void unrefer_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) |
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{ |
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/* must be called under down_write(xattr_sem) */ |
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if (atomic_dec_and_lock(&xd->refcnt, &c->erase_completion_lock)) { |
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unload_xattr_datum(c, xd); |
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xd->flags |= JFFS2_XFLAGS_DEAD; |
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if (xd->node == (void *)xd) { |
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BUG_ON(!(xd->flags & JFFS2_XFLAGS_INVALID)); |
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jffs2_free_xattr_datum(xd); |
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} else { |
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list_add(&xd->xindex, &c->xattr_dead_list); |
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} |
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spin_unlock(&c->erase_completion_lock); |
|
|
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dbg_xattr("xdatum(xid=%u, version=%u) was removed.\n", |
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xd->xid, xd->version); |
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} |
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} |
|
|
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/* -------- xref related functions ------------------ |
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* verify_xattr_ref(c, ref) |
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* is used to load xref information from medium. Because summary data does not |
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* contain xid/ino, it's necessary to verify once while mounting process. |
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* save_xattr_ref(c, ref) |
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* is used to write xref to medium. If delete marker is marked, it write |
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* a delete marker of xref into medium. |
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* create_xattr_ref(c, ic, xd) |
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* is used to create a new xref and write to medium. |
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* delete_xattr_ref(c, ref) |
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* is used to delete jffs2_xattr_ref. It marks xref XREF_DELETE_MARKER, |
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* and allows GC to reclaim those physical nodes. |
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* jffs2_xattr_delete_inode(c, ic) |
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* is called to remove xrefs related to obsolete inode when inode is unlinked. |
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* jffs2_xattr_free_inode(c, ic) |
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* is called to release xattr related objects when unmounting. |
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* check_xattr_ref_inode(c, ic) |
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* is used to confirm inode does not have duplicate xattr name/value pair. |
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* jffs2_xattr_do_crccheck_inode(c, ic) |
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* is used to force xattr data integrity check during the initial gc scan. |
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* -------------------------------------------------- */ |
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static int verify_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref) |
|
{ |
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struct jffs2_eraseblock *jeb; |
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struct jffs2_raw_node_ref *raw; |
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struct jffs2_raw_xref rr; |
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size_t readlen; |
|
uint32_t crc, offset, totlen; |
|
int rc; |
|
|
|
spin_lock(&c->erase_completion_lock); |
|
if (ref_flags(ref->node) != REF_UNCHECKED) |
|
goto complete; |
|
offset = ref_offset(ref->node); |
|
spin_unlock(&c->erase_completion_lock); |
|
|
|
rc = jffs2_flash_read(c, offset, sizeof(rr), &readlen, (char *)&rr); |
|
if (rc || sizeof(rr) != readlen) { |
|
JFFS2_WARNING("jffs2_flash_read()=%d, req=%zu, read=%zu, at %#08x\n", |
|
rc, sizeof(rr), readlen, offset); |
|
return rc ? rc : -EIO; |
|
} |
|
/* obsolete node */ |
|
crc = crc32(0, &rr, sizeof(rr) - 4); |
|
if (crc != je32_to_cpu(rr.node_crc)) { |
|
JFFS2_ERROR("node CRC failed at %#08x, read=%#08x, calc=%#08x\n", |
|
offset, je32_to_cpu(rr.node_crc), crc); |
|
return JFFS2_XATTR_IS_CORRUPTED; |
|
} |
|
if (je16_to_cpu(rr.magic) != JFFS2_MAGIC_BITMASK |
|
|| je16_to_cpu(rr.nodetype) != JFFS2_NODETYPE_XREF |
|
|| je32_to_cpu(rr.totlen) != PAD(sizeof(rr))) { |
|
JFFS2_ERROR("inconsistent xref at %#08x, magic=%#04x/%#04x, " |
|
"nodetype=%#04x/%#04x, totlen=%u/%zu\n", |
|
offset, je16_to_cpu(rr.magic), JFFS2_MAGIC_BITMASK, |
|
je16_to_cpu(rr.nodetype), JFFS2_NODETYPE_XREF, |
|
je32_to_cpu(rr.totlen), PAD(sizeof(rr))); |
|
return JFFS2_XATTR_IS_CORRUPTED; |
|
} |
|
ref->ino = je32_to_cpu(rr.ino); |
|
ref->xid = je32_to_cpu(rr.xid); |
|
ref->xseqno = je32_to_cpu(rr.xseqno); |
|
if (ref->xseqno > c->highest_xseqno) |
|
c->highest_xseqno = (ref->xseqno & ~XREF_DELETE_MARKER); |
|
|
|
spin_lock(&c->erase_completion_lock); |
|
complete: |
|
for (raw=ref->node; raw != (void *)ref; raw=raw->next_in_ino) { |
|
jeb = &c->blocks[ref_offset(raw) / c->sector_size]; |
|
totlen = PAD(ref_totlen(c, jeb, raw)); |
|
if (ref_flags(raw) == REF_UNCHECKED) { |
|
c->unchecked_size -= totlen; c->used_size += totlen; |
|
jeb->unchecked_size -= totlen; jeb->used_size += totlen; |
|
} |
|
raw->flash_offset = ref_offset(raw) | ((ref->node==raw) ? REF_PRISTINE : REF_NORMAL); |
|
} |
|
spin_unlock(&c->erase_completion_lock); |
|
|
|
dbg_xattr("success on verifying xref (ino=%u, xid=%u) at %#08x\n", |
|
ref->ino, ref->xid, ref_offset(ref->node)); |
|
return 0; |
|
} |
|
|
|
static int save_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref) |
|
{ |
|
/* must be called under down_write(xattr_sem) */ |
|
struct jffs2_raw_xref rr; |
|
size_t length; |
|
uint32_t xseqno, phys_ofs = write_ofs(c); |
|
int ret; |
|
|
|
rr.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); |
|
rr.nodetype = cpu_to_je16(JFFS2_NODETYPE_XREF); |
|
rr.totlen = cpu_to_je32(PAD(sizeof(rr))); |
|
rr.hdr_crc = cpu_to_je32(crc32(0, &rr, sizeof(struct jffs2_unknown_node) - 4)); |
|
|
|
xseqno = (c->highest_xseqno += 2); |
|
if (is_xattr_ref_dead(ref)) { |
|
xseqno |= XREF_DELETE_MARKER; |
|
rr.ino = cpu_to_je32(ref->ino); |
|
rr.xid = cpu_to_je32(ref->xid); |
|
} else { |
|
rr.ino = cpu_to_je32(ref->ic->ino); |
|
rr.xid = cpu_to_je32(ref->xd->xid); |
|
} |
|
rr.xseqno = cpu_to_je32(xseqno); |
|
rr.node_crc = cpu_to_je32(crc32(0, &rr, sizeof(rr) - 4)); |
|
|
|
ret = jffs2_flash_write(c, phys_ofs, sizeof(rr), &length, (char *)&rr); |
|
if (ret || sizeof(rr) != length) { |
|
JFFS2_WARNING("jffs2_flash_write() returned %d, request=%zu, retlen=%zu, at %#08x\n", |
|
ret, sizeof(rr), length, phys_ofs); |
|
ret = ret ? ret : -EIO; |
|
if (length) |
|
jffs2_add_physical_node_ref(c, phys_ofs | REF_OBSOLETE, PAD(sizeof(rr)), NULL); |
|
|
|
return ret; |
|
} |
|
/* success */ |
|
ref->xseqno = xseqno; |
|
jffs2_add_physical_node_ref(c, phys_ofs | REF_PRISTINE, PAD(sizeof(rr)), (void *)ref); |
|
|
|
dbg_xattr("success on saving xref (ino=%u, xid=%u)\n", ref->ic->ino, ref->xd->xid); |
|
|
|
return 0; |
|
} |
|
|
|
static struct jffs2_xattr_ref *create_xattr_ref(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic, |
|
struct jffs2_xattr_datum *xd) |
|
{ |
|
/* must be called under down_write(xattr_sem) */ |
|
struct jffs2_xattr_ref *ref; |
|
int ret; |
|
|
|
ref = jffs2_alloc_xattr_ref(); |
|
if (!ref) |
|
return ERR_PTR(-ENOMEM); |
|
ref->ic = ic; |
|
ref->xd = xd; |
|
|
|
ret = save_xattr_ref(c, ref); |
|
if (ret) { |
|
jffs2_free_xattr_ref(ref); |
|
return ERR_PTR(ret); |
|
} |
|
|
|
/* Chain to inode */ |
|
ref->next = ic->xref; |
|
ic->xref = ref; |
|
|
|
return ref; /* success */ |
|
} |
|
|
|
static void delete_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref) |
|
{ |
|
/* must be called under down_write(xattr_sem) */ |
|
struct jffs2_xattr_datum *xd; |
|
|
|
xd = ref->xd; |
|
ref->xseqno |= XREF_DELETE_MARKER; |
|
ref->ino = ref->ic->ino; |
|
ref->xid = ref->xd->xid; |
|
spin_lock(&c->erase_completion_lock); |
|
ref->next = c->xref_dead_list; |
|
c->xref_dead_list = ref; |
|
spin_unlock(&c->erase_completion_lock); |
|
|
|
dbg_xattr("xref(ino=%u, xid=%u, xseqno=%u) was removed.\n", |
|
ref->ino, ref->xid, ref->xseqno); |
|
|
|
unrefer_xattr_datum(c, xd); |
|
} |
|
|
|
void jffs2_xattr_delete_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic) |
|
{ |
|
/* It's called from jffs2_evict_inode() on inode removing. |
|
When an inode with XATTR is removed, those XATTRs must be removed. */ |
|
struct jffs2_xattr_ref *ref, *_ref; |
|
|
|
if (!ic || ic->pino_nlink > 0) |
|
return; |
|
|
|
down_write(&c->xattr_sem); |
|
for (ref = ic->xref; ref; ref = _ref) { |
|
_ref = ref->next; |
|
delete_xattr_ref(c, ref); |
|
} |
|
ic->xref = NULL; |
|
up_write(&c->xattr_sem); |
|
} |
|
|
|
void jffs2_xattr_free_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic) |
|
{ |
|
/* It's called from jffs2_free_ino_caches() until unmounting FS. */ |
|
struct jffs2_xattr_datum *xd; |
|
struct jffs2_xattr_ref *ref, *_ref; |
|
|
|
down_write(&c->xattr_sem); |
|
for (ref = ic->xref; ref; ref = _ref) { |
|
_ref = ref->next; |
|
xd = ref->xd; |
|
if (atomic_dec_and_test(&xd->refcnt)) { |
|
unload_xattr_datum(c, xd); |
|
jffs2_free_xattr_datum(xd); |
|
} |
|
jffs2_free_xattr_ref(ref); |
|
} |
|
ic->xref = NULL; |
|
up_write(&c->xattr_sem); |
|
} |
|
|
|
static int check_xattr_ref_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic) |
|
{ |
|
/* success of check_xattr_ref_inode() means that inode (ic) dose not have |
|
* duplicate name/value pairs. If duplicate name/value pair would be found, |
|
* one will be removed. |
|
*/ |
|
struct jffs2_xattr_ref *ref, *cmp, **pref, **pcmp; |
|
int rc = 0; |
|
|
|
if (likely(ic->flags & INO_FLAGS_XATTR_CHECKED)) |
|
return 0; |
|
down_write(&c->xattr_sem); |
|
retry: |
|
rc = 0; |
|
for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) { |
|
if (!ref->xd->xname) { |
|
rc = load_xattr_datum(c, ref->xd); |
|
if (unlikely(rc > 0)) { |
|
*pref = ref->next; |
|
delete_xattr_ref(c, ref); |
|
goto retry; |
|
} else if (unlikely(rc < 0)) |
|
goto out; |
|
} |
|
for (cmp=ref->next, pcmp=&ref->next; cmp; pcmp=&cmp->next, cmp=cmp->next) { |
|
if (!cmp->xd->xname) { |
|
ref->xd->flags |= JFFS2_XFLAGS_BIND; |
|
rc = load_xattr_datum(c, cmp->xd); |
|
ref->xd->flags &= ~JFFS2_XFLAGS_BIND; |
|
if (unlikely(rc > 0)) { |
|
*pcmp = cmp->next; |
|
delete_xattr_ref(c, cmp); |
|
goto retry; |
|
} else if (unlikely(rc < 0)) |
|
goto out; |
|
} |
|
if (ref->xd->xprefix == cmp->xd->xprefix |
|
&& !strcmp(ref->xd->xname, cmp->xd->xname)) { |
|
if (ref->xseqno > cmp->xseqno) { |
|
*pcmp = cmp->next; |
|
delete_xattr_ref(c, cmp); |
|
} else { |
|
*pref = ref->next; |
|
delete_xattr_ref(c, ref); |
|
} |
|
goto retry; |
|
} |
|
} |
|
} |
|
ic->flags |= INO_FLAGS_XATTR_CHECKED; |
|
out: |
|
up_write(&c->xattr_sem); |
|
|
|
return rc; |
|
} |
|
|
|
void jffs2_xattr_do_crccheck_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic) |
|
{ |
|
check_xattr_ref_inode(c, ic); |
|
} |
|
|
|
/* -------- xattr subsystem functions --------------- |
|
* jffs2_init_xattr_subsystem(c) |
|
* is used to initialize semaphore and list_head, and some variables. |
|
* jffs2_find_xattr_datum(c, xid) |
|
* is used to lookup xdatum while scanning process. |
|
* jffs2_clear_xattr_subsystem(c) |
|
* is used to release any xattr related objects. |
|
* jffs2_build_xattr_subsystem(c) |
|
* is used to associate xdatum and xref while super block building process. |
|
* jffs2_setup_xattr_datum(c, xid, version) |
|
* is used to insert xdatum while scanning process. |
|
* -------------------------------------------------- */ |
|
void jffs2_init_xattr_subsystem(struct jffs2_sb_info *c) |
|
{ |
|
int i; |
|
|
|
for (i=0; i < XATTRINDEX_HASHSIZE; i++) |
|
INIT_LIST_HEAD(&c->xattrindex[i]); |
|
INIT_LIST_HEAD(&c->xattr_unchecked); |
|
INIT_LIST_HEAD(&c->xattr_dead_list); |
|
c->xref_dead_list = NULL; |
|
c->xref_temp = NULL; |
|
|
|
init_rwsem(&c->xattr_sem); |
|
c->highest_xid = 0; |
|
c->highest_xseqno = 0; |
|
c->xdatum_mem_usage = 0; |
|
c->xdatum_mem_threshold = 32 * 1024; /* Default 32KB */ |
|
} |
|
|
|
static struct jffs2_xattr_datum *jffs2_find_xattr_datum(struct jffs2_sb_info *c, uint32_t xid) |
|
{ |
|
struct jffs2_xattr_datum *xd; |
|
int i = xid % XATTRINDEX_HASHSIZE; |
|
|
|
/* It's only used in scanning/building process. */ |
|
BUG_ON(!(c->flags & (JFFS2_SB_FLAG_SCANNING|JFFS2_SB_FLAG_BUILDING))); |
|
|
|
list_for_each_entry(xd, &c->xattrindex[i], xindex) { |
|
if (xd->xid==xid) |
|
return xd; |
|
} |
|
return NULL; |
|
} |
|
|
|
void jffs2_clear_xattr_subsystem(struct jffs2_sb_info *c) |
|
{ |
|
struct jffs2_xattr_datum *xd, *_xd; |
|
struct jffs2_xattr_ref *ref, *_ref; |
|
int i; |
|
|
|
for (ref=c->xref_temp; ref; ref = _ref) { |
|
_ref = ref->next; |
|
jffs2_free_xattr_ref(ref); |
|
} |
|
|
|
for (ref=c->xref_dead_list; ref; ref = _ref) { |
|
_ref = ref->next; |
|
jffs2_free_xattr_ref(ref); |
|
} |
|
|
|
for (i=0; i < XATTRINDEX_HASHSIZE; i++) { |
|
list_for_each_entry_safe(xd, _xd, &c->xattrindex[i], xindex) { |
|
list_del(&xd->xindex); |
|
kfree(xd->xname); |
|
jffs2_free_xattr_datum(xd); |
|
} |
|
} |
|
|
|
list_for_each_entry_safe(xd, _xd, &c->xattr_dead_list, xindex) { |
|
list_del(&xd->xindex); |
|
jffs2_free_xattr_datum(xd); |
|
} |
|
list_for_each_entry_safe(xd, _xd, &c->xattr_unchecked, xindex) { |
|
list_del(&xd->xindex); |
|
jffs2_free_xattr_datum(xd); |
|
} |
|
} |
|
|
|
#define XREF_TMPHASH_SIZE (128) |
|
void jffs2_build_xattr_subsystem(struct jffs2_sb_info *c) |
|
{ |
|
struct jffs2_xattr_ref *ref, *_ref; |
|
struct jffs2_xattr_ref *xref_tmphash[XREF_TMPHASH_SIZE]; |
|
struct jffs2_xattr_datum *xd, *_xd; |
|
struct jffs2_inode_cache *ic; |
|
struct jffs2_raw_node_ref *raw; |
|
int i, xdatum_count = 0, xdatum_unchecked_count = 0, xref_count = 0; |
|
int xdatum_orphan_count = 0, xref_orphan_count = 0, xref_dead_count = 0; |
|
|
|
BUG_ON(!(c->flags & JFFS2_SB_FLAG_BUILDING)); |
|
|
|
/* Phase.1 : Merge same xref */ |
|
for (i=0; i < XREF_TMPHASH_SIZE; i++) |
|
xref_tmphash[i] = NULL; |
|
for (ref=c->xref_temp; ref; ref=_ref) { |
|
struct jffs2_xattr_ref *tmp; |
|
|
|
_ref = ref->next; |
|
if (ref_flags(ref->node) != REF_PRISTINE) { |
|
if (verify_xattr_ref(c, ref)) { |
|
BUG_ON(ref->node->next_in_ino != (void *)ref); |
|
ref->node->next_in_ino = NULL; |
|
jffs2_mark_node_obsolete(c, ref->node); |
|
jffs2_free_xattr_ref(ref); |
|
continue; |
|
} |
|
} |
|
|
|
i = (ref->ino ^ ref->xid) % XREF_TMPHASH_SIZE; |
|
for (tmp=xref_tmphash[i]; tmp; tmp=tmp->next) { |
|
if (tmp->ino == ref->ino && tmp->xid == ref->xid) |
|
break; |
|
} |
|
if (tmp) { |
|
raw = ref->node; |
|
if (ref->xseqno > tmp->xseqno) { |
|
tmp->xseqno = ref->xseqno; |
|
raw->next_in_ino = tmp->node; |
|
tmp->node = raw; |
|
} else { |
|
raw->next_in_ino = tmp->node->next_in_ino; |
|
tmp->node->next_in_ino = raw; |
|
} |
|
jffs2_free_xattr_ref(ref); |
|
continue; |
|
} else { |
|
ref->next = xref_tmphash[i]; |
|
xref_tmphash[i] = ref; |
|
} |
|
} |
|
c->xref_temp = NULL; |
|
|
|
/* Phase.2 : Bind xref with inode_cache and xattr_datum */ |
|
for (i=0; i < XREF_TMPHASH_SIZE; i++) { |
|
for (ref=xref_tmphash[i]; ref; ref=_ref) { |
|
xref_count++; |
|
_ref = ref->next; |
|
if (is_xattr_ref_dead(ref)) { |
|
ref->next = c->xref_dead_list; |
|
c->xref_dead_list = ref; |
|
xref_dead_count++; |
|
continue; |
|
} |
|
/* At this point, ref->xid and ref->ino contain XID and inode number. |
|
ref->xd and ref->ic are not valid yet. */ |
|
xd = jffs2_find_xattr_datum(c, ref->xid); |
|
ic = jffs2_get_ino_cache(c, ref->ino); |
|
if (!xd || !ic || !ic->pino_nlink) { |
|
dbg_xattr("xref(ino=%u, xid=%u, xseqno=%u) is orphan.\n", |
|
ref->ino, ref->xid, ref->xseqno); |
|
ref->xseqno |= XREF_DELETE_MARKER; |
|
ref->next = c->xref_dead_list; |
|
c->xref_dead_list = ref; |
|
xref_orphan_count++; |
|
continue; |
|
} |
|
ref->xd = xd; |
|
ref->ic = ic; |
|
atomic_inc(&xd->refcnt); |
|
ref->next = ic->xref; |
|
ic->xref = ref; |
|
} |
|
} |
|
|
|
/* Phase.3 : Link unchecked xdatum to xattr_unchecked list */ |
|
for (i=0; i < XATTRINDEX_HASHSIZE; i++) { |
|
list_for_each_entry_safe(xd, _xd, &c->xattrindex[i], xindex) { |
|
xdatum_count++; |
|
list_del_init(&xd->xindex); |
|
if (!atomic_read(&xd->refcnt)) { |
|
dbg_xattr("xdatum(xid=%u, version=%u) is orphan.\n", |
|
xd->xid, xd->version); |
|
xd->flags |= JFFS2_XFLAGS_DEAD; |
|
list_add(&xd->xindex, &c->xattr_unchecked); |
|
xdatum_orphan_count++; |
|
continue; |
|
} |
|
if (is_xattr_datum_unchecked(c, xd)) { |
|
dbg_xattr("unchecked xdatum(xid=%u, version=%u)\n", |
|
xd->xid, xd->version); |
|
list_add(&xd->xindex, &c->xattr_unchecked); |
|
xdatum_unchecked_count++; |
|
} |
|
} |
|
} |
|
/* build complete */ |
|
JFFS2_NOTICE("complete building xattr subsystem, %u of xdatum" |
|
" (%u unchecked, %u orphan) and " |
|
"%u of xref (%u dead, %u orphan) found.\n", |
|
xdatum_count, xdatum_unchecked_count, xdatum_orphan_count, |
|
xref_count, xref_dead_count, xref_orphan_count); |
|
} |
|
|
|
struct jffs2_xattr_datum *jffs2_setup_xattr_datum(struct jffs2_sb_info *c, |
|
uint32_t xid, uint32_t version) |
|
{ |
|
struct jffs2_xattr_datum *xd; |
|
|
|
xd = jffs2_find_xattr_datum(c, xid); |
|
if (!xd) { |
|
xd = jffs2_alloc_xattr_datum(); |
|
if (!xd) |
|
return ERR_PTR(-ENOMEM); |
|
xd->xid = xid; |
|
xd->version = version; |
|
if (xd->xid > c->highest_xid) |
|
c->highest_xid = xd->xid; |
|
list_add_tail(&xd->xindex, &c->xattrindex[xid % XATTRINDEX_HASHSIZE]); |
|
} |
|
return xd; |
|
} |
|
|
|
/* -------- xattr subsystem functions --------------- |
|
* xprefix_to_handler(xprefix) |
|
* is used to translate xprefix into xattr_handler. |
|
* jffs2_listxattr(dentry, buffer, size) |
|
* is an implementation of listxattr handler on jffs2. |
|
* do_jffs2_getxattr(inode, xprefix, xname, buffer, size) |
|
* is an implementation of getxattr handler on jffs2. |
|
* do_jffs2_setxattr(inode, xprefix, xname, buffer, size, flags) |
|
* is an implementation of setxattr handler on jffs2. |
|
* -------------------------------------------------- */ |
|
const struct xattr_handler *jffs2_xattr_handlers[] = { |
|
&jffs2_user_xattr_handler, |
|
#ifdef CONFIG_JFFS2_FS_SECURITY |
|
&jffs2_security_xattr_handler, |
|
#endif |
|
#ifdef CONFIG_JFFS2_FS_POSIX_ACL |
|
&posix_acl_access_xattr_handler, |
|
&posix_acl_default_xattr_handler, |
|
#endif |
|
&jffs2_trusted_xattr_handler, |
|
NULL |
|
}; |
|
|
|
static const struct xattr_handler *xprefix_to_handler(int xprefix) { |
|
const struct xattr_handler *ret; |
|
|
|
switch (xprefix) { |
|
case JFFS2_XPREFIX_USER: |
|
ret = &jffs2_user_xattr_handler; |
|
break; |
|
#ifdef CONFIG_JFFS2_FS_SECURITY |
|
case JFFS2_XPREFIX_SECURITY: |
|
ret = &jffs2_security_xattr_handler; |
|
break; |
|
#endif |
|
#ifdef CONFIG_JFFS2_FS_POSIX_ACL |
|
case JFFS2_XPREFIX_ACL_ACCESS: |
|
ret = &posix_acl_access_xattr_handler; |
|
break; |
|
case JFFS2_XPREFIX_ACL_DEFAULT: |
|
ret = &posix_acl_default_xattr_handler; |
|
break; |
|
#endif |
|
case JFFS2_XPREFIX_TRUSTED: |
|
ret = &jffs2_trusted_xattr_handler; |
|
break; |
|
default: |
|
ret = NULL; |
|
break; |
|
} |
|
return ret; |
|
} |
|
|
|
ssize_t jffs2_listxattr(struct dentry *dentry, char *buffer, size_t size) |
|
{ |
|
struct inode *inode = d_inode(dentry); |
|
struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); |
|
struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); |
|
struct jffs2_inode_cache *ic = f->inocache; |
|
struct jffs2_xattr_ref *ref, **pref; |
|
struct jffs2_xattr_datum *xd; |
|
const struct xattr_handler *xhandle; |
|
const char *prefix; |
|
ssize_t prefix_len, len, rc; |
|
int retry = 0; |
|
|
|
rc = check_xattr_ref_inode(c, ic); |
|
if (unlikely(rc)) |
|
return rc; |
|
|
|
down_read(&c->xattr_sem); |
|
retry: |
|
len = 0; |
|
for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) { |
|
BUG_ON(ref->ic != ic); |
|
xd = ref->xd; |
|
if (!xd->xname) { |
|
/* xdatum is unchached */ |
|
if (!retry) { |
|
retry = 1; |
|
up_read(&c->xattr_sem); |
|
down_write(&c->xattr_sem); |
|
goto retry; |
|
} else { |
|
rc = load_xattr_datum(c, xd); |
|
if (unlikely(rc > 0)) { |
|
*pref = ref->next; |
|
delete_xattr_ref(c, ref); |
|
goto retry; |
|
} else if (unlikely(rc < 0)) |
|
goto out; |
|
} |
|
} |
|
xhandle = xprefix_to_handler(xd->xprefix); |
|
if (!xhandle || (xhandle->list && !xhandle->list(dentry))) |
|
continue; |
|
prefix = xhandle->prefix ?: xhandle->name; |
|
prefix_len = strlen(prefix); |
|
rc = prefix_len + xd->name_len + 1; |
|
|
|
if (buffer) { |
|
if (rc > size - len) { |
|
rc = -ERANGE; |
|
goto out; |
|
} |
|
memcpy(buffer, prefix, prefix_len); |
|
buffer += prefix_len; |
|
memcpy(buffer, xd->xname, xd->name_len); |
|
buffer += xd->name_len; |
|
*buffer++ = 0; |
|
} |
|
len += rc; |
|
} |
|
rc = len; |
|
out: |
|
if (!retry) { |
|
up_read(&c->xattr_sem); |
|
} else { |
|
up_write(&c->xattr_sem); |
|
} |
|
return rc; |
|
} |
|
|
|
int do_jffs2_getxattr(struct inode *inode, int xprefix, const char *xname, |
|
char *buffer, size_t size) |
|
{ |
|
struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); |
|
struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); |
|
struct jffs2_inode_cache *ic = f->inocache; |
|
struct jffs2_xattr_datum *xd; |
|
struct jffs2_xattr_ref *ref, **pref; |
|
int rc, retry = 0; |
|
|
|
rc = check_xattr_ref_inode(c, ic); |
|
if (unlikely(rc)) |
|
return rc; |
|
|
|
down_read(&c->xattr_sem); |
|
retry: |
|
for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) { |
|
BUG_ON(ref->ic!=ic); |
|
|
|
xd = ref->xd; |
|
if (xd->xprefix != xprefix) |
|
continue; |
|
if (!xd->xname) { |
|
/* xdatum is unchached */ |
|
if (!retry) { |
|
retry = 1; |
|
up_read(&c->xattr_sem); |
|
down_write(&c->xattr_sem); |
|
goto retry; |
|
} else { |
|
rc = load_xattr_datum(c, xd); |
|
if (unlikely(rc > 0)) { |
|
*pref = ref->next; |
|
delete_xattr_ref(c, ref); |
|
goto retry; |
|
} else if (unlikely(rc < 0)) { |
|
goto out; |
|
} |
|
} |
|
} |
|
if (!strcmp(xname, xd->xname)) { |
|
rc = xd->value_len; |
|
if (buffer) { |
|
if (size < rc) { |
|
rc = -ERANGE; |
|
} else { |
|
memcpy(buffer, xd->xvalue, rc); |
|
} |
|
} |
|
goto out; |
|
} |
|
} |
|
rc = -ENODATA; |
|
out: |
|
if (!retry) { |
|
up_read(&c->xattr_sem); |
|
} else { |
|
up_write(&c->xattr_sem); |
|
} |
|
return rc; |
|
} |
|
|
|
int do_jffs2_setxattr(struct inode *inode, int xprefix, const char *xname, |
|
const char *buffer, size_t size, int flags) |
|
{ |
|
struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); |
|
struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); |
|
struct jffs2_inode_cache *ic = f->inocache; |
|
struct jffs2_xattr_datum *xd; |
|
struct jffs2_xattr_ref *ref, *newref, **pref; |
|
uint32_t length, request; |
|
int rc; |
|
|
|
rc = check_xattr_ref_inode(c, ic); |
|
if (unlikely(rc)) |
|
return rc; |
|
|
|
request = PAD(sizeof(struct jffs2_raw_xattr) + strlen(xname) + 1 + size); |
|
rc = jffs2_reserve_space(c, request, &length, |
|
ALLOC_NORMAL, JFFS2_SUMMARY_XATTR_SIZE); |
|
if (rc) { |
|
JFFS2_WARNING("jffs2_reserve_space()=%d, request=%u\n", rc, request); |
|
return rc; |
|
} |
|
|
|
/* Find existing xattr */ |
|
down_write(&c->xattr_sem); |
|
retry: |
|
for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) { |
|
xd = ref->xd; |
|
if (xd->xprefix != xprefix) |
|
continue; |
|
if (!xd->xname) { |
|
rc = load_xattr_datum(c, xd); |
|
if (unlikely(rc > 0)) { |
|
*pref = ref->next; |
|
delete_xattr_ref(c, ref); |
|
goto retry; |
|
} else if (unlikely(rc < 0)) |
|
goto out; |
|
} |
|
if (!strcmp(xd->xname, xname)) { |
|
if (flags & XATTR_CREATE) { |
|
rc = -EEXIST; |
|
goto out; |
|
} |
|
if (!buffer) { |
|
ref->ino = ic->ino; |
|
ref->xid = xd->xid; |
|
ref->xseqno |= XREF_DELETE_MARKER; |
|
rc = save_xattr_ref(c, ref); |
|
if (!rc) { |
|
*pref = ref->next; |
|
spin_lock(&c->erase_completion_lock); |
|
ref->next = c->xref_dead_list; |
|
c->xref_dead_list = ref; |
|
spin_unlock(&c->erase_completion_lock); |
|
unrefer_xattr_datum(c, xd); |
|
} else { |
|
ref->ic = ic; |
|
ref->xd = xd; |
|
ref->xseqno &= ~XREF_DELETE_MARKER; |
|
} |
|
goto out; |
|
} |
|
goto found; |
|
} |
|
} |
|
/* not found */ |
|
if (flags & XATTR_REPLACE) { |
|
rc = -ENODATA; |
|
goto out; |
|
} |
|
if (!buffer) { |
|
rc = -ENODATA; |
|
goto out; |
|
} |
|
found: |
|
xd = create_xattr_datum(c, xprefix, xname, buffer, size); |
|
if (IS_ERR(xd)) { |
|
rc = PTR_ERR(xd); |
|
goto out; |
|
} |
|
up_write(&c->xattr_sem); |
|
jffs2_complete_reservation(c); |
|
|
|
/* create xattr_ref */ |
|
request = PAD(sizeof(struct jffs2_raw_xref)); |
|
rc = jffs2_reserve_space(c, request, &length, |
|
ALLOC_NORMAL, JFFS2_SUMMARY_XREF_SIZE); |
|
down_write(&c->xattr_sem); |
|
if (rc) { |
|
JFFS2_WARNING("jffs2_reserve_space()=%d, request=%u\n", rc, request); |
|
unrefer_xattr_datum(c, xd); |
|
up_write(&c->xattr_sem); |
|
return rc; |
|
} |
|
if (ref) |
|
*pref = ref->next; |
|
newref = create_xattr_ref(c, ic, xd); |
|
if (IS_ERR(newref)) { |
|
if (ref) { |
|
ref->next = ic->xref; |
|
ic->xref = ref; |
|
} |
|
rc = PTR_ERR(newref); |
|
unrefer_xattr_datum(c, xd); |
|
} else if (ref) { |
|
delete_xattr_ref(c, ref); |
|
} |
|
out: |
|
up_write(&c->xattr_sem); |
|
jffs2_complete_reservation(c); |
|
return rc; |
|
} |
|
|
|
/* -------- garbage collector functions ------------- |
|
* jffs2_garbage_collect_xattr_datum(c, xd, raw) |
|
* is used to move xdatum into new node. |
|
* jffs2_garbage_collect_xattr_ref(c, ref, raw) |
|
* is used to move xref into new node. |
|
* jffs2_verify_xattr(c) |
|
* is used to call do_verify_xattr_datum() before garbage collecting. |
|
* jffs2_release_xattr_datum(c, xd) |
|
* is used to release an in-memory object of xdatum. |
|
* jffs2_release_xattr_ref(c, ref) |
|
* is used to release an in-memory object of xref. |
|
* -------------------------------------------------- */ |
|
int jffs2_garbage_collect_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd, |
|
struct jffs2_raw_node_ref *raw) |
|
{ |
|
uint32_t totlen, length, old_ofs; |
|
int rc = 0; |
|
|
|
down_write(&c->xattr_sem); |
|
if (xd->node != raw) |
|
goto out; |
|
if (xd->flags & (JFFS2_XFLAGS_DEAD|JFFS2_XFLAGS_INVALID)) |
|
goto out; |
|
|
|
rc = load_xattr_datum(c, xd); |
|
if (unlikely(rc)) { |
|
rc = (rc > 0) ? 0 : rc; |
|
goto out; |
|
} |
|
old_ofs = ref_offset(xd->node); |
|
totlen = PAD(sizeof(struct jffs2_raw_xattr) |
|
+ xd->name_len + 1 + xd->value_len); |
|
rc = jffs2_reserve_space_gc(c, totlen, &length, JFFS2_SUMMARY_XATTR_SIZE); |
|
if (rc) { |
|
JFFS2_WARNING("jffs2_reserve_space_gc()=%d, request=%u\n", rc, totlen); |
|
goto out; |
|
} |
|
rc = save_xattr_datum(c, xd); |
|
if (!rc) |
|
dbg_xattr("xdatum (xid=%u, version=%u) GC'ed from %#08x to %08x\n", |
|
xd->xid, xd->version, old_ofs, ref_offset(xd->node)); |
|
out: |
|
if (!rc) |
|
jffs2_mark_node_obsolete(c, raw); |
|
up_write(&c->xattr_sem); |
|
return rc; |
|
} |
|
|
|
int jffs2_garbage_collect_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref, |
|
struct jffs2_raw_node_ref *raw) |
|
{ |
|
uint32_t totlen, length, old_ofs; |
|
int rc = 0; |
|
|
|
down_write(&c->xattr_sem); |
|
BUG_ON(!ref->node); |
|
|
|
if (ref->node != raw) |
|
goto out; |
|
if (is_xattr_ref_dead(ref) && (raw->next_in_ino == (void *)ref)) |
|
goto out; |
|
|
|
old_ofs = ref_offset(ref->node); |
|
totlen = ref_totlen(c, c->gcblock, ref->node); |
|
|
|
rc = jffs2_reserve_space_gc(c, totlen, &length, JFFS2_SUMMARY_XREF_SIZE); |
|
if (rc) { |
|
JFFS2_WARNING("%s: jffs2_reserve_space_gc() = %d, request = %u\n", |
|
__func__, rc, totlen); |
|
goto out; |
|
} |
|
rc = save_xattr_ref(c, ref); |
|
if (!rc) |
|
dbg_xattr("xref (ino=%u, xid=%u) GC'ed from %#08x to %08x\n", |
|
ref->ic->ino, ref->xd->xid, old_ofs, ref_offset(ref->node)); |
|
out: |
|
if (!rc) |
|
jffs2_mark_node_obsolete(c, raw); |
|
up_write(&c->xattr_sem); |
|
return rc; |
|
} |
|
|
|
int jffs2_verify_xattr(struct jffs2_sb_info *c) |
|
{ |
|
struct jffs2_xattr_datum *xd, *_xd; |
|
struct jffs2_eraseblock *jeb; |
|
struct jffs2_raw_node_ref *raw; |
|
uint32_t totlen; |
|
int rc; |
|
|
|
down_write(&c->xattr_sem); |
|
list_for_each_entry_safe(xd, _xd, &c->xattr_unchecked, xindex) { |
|
rc = do_verify_xattr_datum(c, xd); |
|
if (rc < 0) |
|
continue; |
|
list_del_init(&xd->xindex); |
|
spin_lock(&c->erase_completion_lock); |
|
for (raw=xd->node; raw != (void *)xd; raw=raw->next_in_ino) { |
|
if (ref_flags(raw) != REF_UNCHECKED) |
|
continue; |
|
jeb = &c->blocks[ref_offset(raw) / c->sector_size]; |
|
totlen = PAD(ref_totlen(c, jeb, raw)); |
|
c->unchecked_size -= totlen; c->used_size += totlen; |
|
jeb->unchecked_size -= totlen; jeb->used_size += totlen; |
|
raw->flash_offset = ref_offset(raw) |
|
| ((xd->node == (void *)raw) ? REF_PRISTINE : REF_NORMAL); |
|
} |
|
if (xd->flags & JFFS2_XFLAGS_DEAD) |
|
list_add(&xd->xindex, &c->xattr_dead_list); |
|
spin_unlock(&c->erase_completion_lock); |
|
} |
|
up_write(&c->xattr_sem); |
|
return list_empty(&c->xattr_unchecked) ? 1 : 0; |
|
} |
|
|
|
void jffs2_release_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) |
|
{ |
|
/* must be called under spin_lock(&c->erase_completion_lock) */ |
|
if (atomic_read(&xd->refcnt) || xd->node != (void *)xd) |
|
return; |
|
|
|
list_del(&xd->xindex); |
|
jffs2_free_xattr_datum(xd); |
|
} |
|
|
|
void jffs2_release_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref) |
|
{ |
|
/* must be called under spin_lock(&c->erase_completion_lock) */ |
|
struct jffs2_xattr_ref *tmp, **ptmp; |
|
|
|
if (ref->node != (void *)ref) |
|
return; |
|
|
|
for (tmp=c->xref_dead_list, ptmp=&c->xref_dead_list; tmp; ptmp=&tmp->next, tmp=tmp->next) { |
|
if (ref == tmp) { |
|
*ptmp = tmp->next; |
|
break; |
|
} |
|
} |
|
jffs2_free_xattr_ref(ref); |
|
}
|
|
|