| /* |
| * JFFS2 -- Journalling Flash File System, Version 2. |
| * |
| * Copyright © 2006 NEC Corporation |
| * |
| * Created by KaiGai Kohei <kaigai@ak.jp.nec.com> |
| * |
| * For licensing information, see the file 'LICENCE' in this directory. |
| * |
| */ |
| |
| #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| |
| #define JFFS2_XATTR_IS_CORRUPTED 1 |
| |
| #include <linux/kernel.h> |
| #include <linux/slab.h> |
| #include <linux/fs.h> |
| #include <linux/time.h> |
| #include <linux/pagemap.h> |
| #include <linux/highmem.h> |
| #include <linux/crc32.h> |
| #include <linux/jffs2.h> |
| #include <linux/xattr.h> |
| #include <linux/posix_acl_xattr.h> |
| #include <linux/mtd/mtd.h> |
| #include "nodelist.h" |
| /* -------- xdatum related functions ---------------- |
| * xattr_datum_hashkey(xprefix, xname, xvalue, xsize) |
| * is used to calcurate xdatum hashkey. The reminder of hashkey into XATTRINDEX_HASHSIZE is |
| * the index of the xattr name/value pair cache (c->xattrindex). |
| * is_xattr_datum_unchecked(c, xd) |
| * returns 1, if xdatum contains any unchecked raw nodes. if all raw nodes are not |
| * unchecked, it returns 0. |
| * unload_xattr_datum(c, xd) |
| * is used to release xattr name/value pair and detach from c->xattrindex. |
| * reclaim_xattr_datum(c) |
| * is used to reclaim xattr name/value pairs on the xattr name/value pair cache when |
| * memory usage by cache is over c->xdatum_mem_threshold. Currently, this threshold |
| * is hard coded as 32KiB. |
| * do_verify_xattr_datum(c, xd) |
| * is used to load the xdatum informations without name/value pair from the medium. |
| * It's necessary once, because those informations are not collected during mounting |
| * process when EBS is enabled. |
| * 0 will be returned, if success. An negative return value means recoverable error, and |
| * positive return value means unrecoverable error. Thus, caller must remove this xdatum |
| * and xref when it returned positive value. |
| * do_load_xattr_datum(c, xd) |
| * is used to load name/value pair from the medium. |
| * The meanings of return value is same as do_verify_xattr_datum(). |
| * load_xattr_datum(c, xd) |
| * is used to be as a wrapper of do_verify_xattr_datum() and do_load_xattr_datum(). |
| * If xd need to call do_verify_xattr_datum() at first, it's called before calling |
| * do_load_xattr_datum(). The meanings of return value is same as do_verify_xattr_datum(). |
| * save_xattr_datum(c, xd) |
| * is used to write xdatum to medium. xd->version will be incremented. |
| * create_xattr_datum(c, xprefix, xname, xvalue, xsize) |
| * is used to create new xdatum and write to medium. |
| * unrefer_xattr_datum(c, xd) |
| * is used to delete a xdatum. When nobody refers this xdatum, JFFS2_XFLAGS_DEAD |
| * is set on xd->flags and chained xattr_dead_list or release it immediately. |
| * In the first case, the garbage collector release it later. |
| * -------------------------------------------------- */ |
| static uint32_t xattr_datum_hashkey(int xprefix, const char *xname, const char *xvalue, int xsize) |
| { |
| int name_len = strlen(xname); |
| |
| return crc32(xprefix, xname, name_len) ^ crc32(xprefix, xvalue, xsize); |
| } |
| |
| static int is_xattr_datum_unchecked(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) |
| { |
| struct jffs2_raw_node_ref *raw; |
| int rc = 0; |
| |
| spin_lock(&c->erase_completion_lock); |
| for (raw=xd->node; raw != (void *)xd; raw=raw->next_in_ino) { |
| if (ref_flags(raw) == REF_UNCHECKED) { |
| rc = 1; |
| break; |
| } |
| } |
| spin_unlock(&c->erase_completion_lock); |
| return rc; |
| } |
| |
| static void unload_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) |
| { |
| /* must be called under down_write(xattr_sem) */ |
| D1(dbg_xattr("%s: xid=%u, version=%u\n", __func__, xd->xid, xd->version)); |
| if (xd->xname) { |
| c->xdatum_mem_usage -= (xd->name_len + 1 + xd->value_len); |
| kfree(xd->xname); |
| } |
| |
| list_del_init(&xd->xindex); |
| xd->hashkey = 0; |
| xd->xname = NULL; |
| xd->xvalue = NULL; |
| } |
| |
| static void reclaim_xattr_datum(struct jffs2_sb_info *c) |
| { |
| /* must be called under down_write(xattr_sem) */ |
| struct jffs2_xattr_datum *xd, *_xd; |
| uint32_t target, before; |
| static int index = 0; |
| int count; |
| |
| if (c->xdatum_mem_threshold > c->xdatum_mem_usage) |
| return; |
| |
| before = c->xdatum_mem_usage; |
| target = c->xdatum_mem_usage * 4 / 5; /* 20% reduction */ |
| for (count = 0; count < XATTRINDEX_HASHSIZE; count++) { |
| list_for_each_entry_safe(xd, _xd, &c->xattrindex[index], xindex) { |
| if (xd->flags & JFFS2_XFLAGS_HOT) { |
| xd->flags &= ~JFFS2_XFLAGS_HOT; |
| } else if (!(xd->flags & JFFS2_XFLAGS_BIND)) { |
| unload_xattr_datum(c, xd); |
| } |
| if (c->xdatum_mem_usage <= target) |
| goto out; |
| } |
| index = (index+1) % XATTRINDEX_HASHSIZE; |
| } |
| out: |
| JFFS2_NOTICE("xdatum_mem_usage from %u byte to %u byte (%u byte reclaimed)\n", |
| before, c->xdatum_mem_usage, before - c->xdatum_mem_usage); |
| } |
| |
| static int do_verify_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) |
| { |
| /* must be called under down_write(xattr_sem) */ |
| struct jffs2_eraseblock *jeb; |
| struct jffs2_raw_node_ref *raw; |
| struct jffs2_raw_xattr rx; |
| size_t readlen; |
| uint32_t crc, offset, totlen; |
| int rc; |
| |
| spin_lock(&c->erase_completion_lock); |
| offset = ref_offset(xd->node); |
| if (ref_flags(xd->node) == REF_PRISTINE) |
| goto complete; |
| spin_unlock(&c->erase_completion_lock); |
| |
| rc = jffs2_flash_read(c, offset, sizeof(rx), &readlen, (char *)&rx); |
| if (rc || readlen != sizeof(rx)) { |
| JFFS2_WARNING("jffs2_flash_read()=%d, req=%zu, read=%zu at %#08x\n", |
| rc, sizeof(rx), readlen, offset); |
| return rc ? rc : -EIO; |
| } |
| crc = crc32(0, &rx, sizeof(rx) - 4); |
| if (crc != je32_to_cpu(rx.node_crc)) { |
| JFFS2_ERROR("node CRC failed at %#08x, read=%#08x, calc=%#08x\n", |
| offset, je32_to_cpu(rx.hdr_crc), crc); |
| xd->flags |= JFFS2_XFLAGS_INVALID; |
| return JFFS2_XATTR_IS_CORRUPTED; |
| } |
| totlen = PAD(sizeof(rx) + rx.name_len + 1 + je16_to_cpu(rx.value_len)); |
| if (je16_to_cpu(rx.magic) != JFFS2_MAGIC_BITMASK |
| || je16_to_cpu(rx.nodetype) != JFFS2_NODETYPE_XATTR |
| || je32_to_cpu(rx.totlen) != totlen |
| || je32_to_cpu(rx.xid) != xd->xid |
| || je32_to_cpu(rx.version) != xd->version) { |
| JFFS2_ERROR("inconsistent xdatum at %#08x, magic=%#04x/%#04x, " |
| "nodetype=%#04x/%#04x, totlen=%u/%u, xid=%u/%u, version=%u/%u\n", |
| offset, je16_to_cpu(rx.magic), JFFS2_MAGIC_BITMASK, |
| je16_to_cpu(rx.nodetype), JFFS2_NODETYPE_XATTR, |
| je32_to_cpu(rx.totlen), totlen, |
| je32_to_cpu(rx.xid), xd->xid, |
| je32_to_cpu(rx.version), xd->version); |
| xd->flags |= JFFS2_XFLAGS_INVALID; |
| return JFFS2_XATTR_IS_CORRUPTED; |
| } |
| xd->xprefix = rx.xprefix; |
| xd->name_len = rx.name_len; |
| xd->value_len = je16_to_cpu(rx.value_len); |
| xd->data_crc = je32_to_cpu(rx.data_crc); |
| |
| spin_lock(&c->erase_completion_lock); |
| complete: |
| for (raw=xd->node; raw != (void *)xd; 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) | ((xd->node==raw) ? REF_PRISTINE : REF_NORMAL); |
| } |
| spin_unlock(&c->erase_completion_lock); |
| |
| /* unchecked xdatum is chained with c->xattr_unchecked */ |
| list_del_init(&xd->xindex); |
| |
| dbg_xattr("success on verifying xdatum (xid=%u, version=%u)\n", |
| xd->xid, xd->version); |
| |
| return 0; |
| } |
| |
| static int do_load_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) |
| { |
| /* must be called under down_write(xattr_sem) */ |
| char *data; |
| size_t readlen; |
| uint32_t crc, length; |
| int i, ret, retry = 0; |
| |
| BUG_ON(ref_flags(xd->node) != REF_PRISTINE); |
| BUG_ON(!list_empty(&xd->xindex)); |
| retry: |
| length = xd->name_len + 1 + xd->value_len; |
| data = kmalloc(length, GFP_KERNEL); |
| if (!data) |
| return -ENOMEM; |
| |
| ret = jffs2_flash_read(c, ref_offset(xd->node)+sizeof(struct jffs2_raw_xattr), |
| length, &readlen, data); |
| |
| if (ret || length!=readlen) { |
| JFFS2_WARNING("jffs2_flash_read() returned %d, request=%d, readlen=%zu, at %#08x\n", |
| ret, length, readlen, ref_offset(xd->node)); |
| kfree(data); |
| return ret ? ret : -EIO; |
| } |
| |
| data[xd->name_len] = '\0'; |
| crc = crc32(0, data, length); |
| if (crc != xd->data_crc) { |
| JFFS2_WARNING("node CRC failed (JFFS2_NODETYPE_XATTR)" |
| " at %#08x, read: 0x%08x calculated: 0x%08x\n", |
| ref_offset(xd->node), xd->data_crc, crc); |
| kfree(data); |
| xd->flags |= JFFS2_XFLAGS_INVALID; |
| return JFFS2_XATTR_IS_CORRUPTED; |
| } |
| |
| xd->flags |= JFFS2_XFLAGS_HOT; |
| xd->xname = data; |
| xd->xvalue = data + xd->name_len+1; |
| |
| c->xdatum_mem_usage += length; |
| |
| xd->hashkey = xattr_datum_hashkey(xd->xprefix, xd->xname, xd->xvalue, xd->value_len); |
| i = xd->hashkey % XATTRINDEX_HASHSIZE; |
| list_add(&xd->xindex, &c->xattrindex[i]); |
| if (!retry) { |
| retry = 1; |
| reclaim_xattr_datum(c); |
| if (!xd->xname) |
| goto retry; |
| } |
| |
| dbg_xattr("success on loading xdatum (xid=%u, xprefix=%u, xname='%s')\n", |
| xd->xid, xd->xprefix, xd->xname); |
| |
| return 0; |
| } |
| |
| static int load_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) |
| { |
| /* must be called under down_write(xattr_sem); |
| * rc < 0 : recoverable error, try again |
| * rc = 0 : success |
| * rc > 0 : Unrecoverable error, this node should be deleted. |
| */ |
| int rc = 0; |
| |
| BUG_ON(xd->flags & JFFS2_XFLAGS_DEAD); |
| if (xd->xname) |
| return 0; |
| if (xd->flags & JFFS2_XFLAGS_INVALID) |
| return JFFS2_XATTR_IS_CORRUPTED; |
| if (unlikely(is_xattr_datum_unchecked(c, xd))) |
| rc = do_verify_xattr_datum(c, xd); |
| if (!rc) |
| rc = do_load_xattr_datum(c, xd); |
| return rc; |
| } |
| |
| static int save_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) |
| { |
| /* must be called under down_write(xattr_sem) */ |
| struct jffs2_raw_xattr rx; |
| struct kvec vecs[2]; |
| size_t length; |
| int rc, totlen; |
| uint32_t phys_ofs = write_ofs(c); |
| |
| BUG_ON(!xd->xname); |
| BUG_ON(xd->flags & (JFFS2_XFLAGS_DEAD|JFFS2_XFLAGS_INVALID)); |
| |
| vecs[0].iov_base = ℞ |
| vecs[0].iov_len = sizeof(rx); |
| vecs[1].iov_base = xd->xname; |
| vecs[1].iov_len = xd->name_len + 1 + xd->value_len; |
| totlen = vecs[0].iov_len + vecs[1].iov_len; |
| |
| /* Setup raw-xattr */ |
| memset(&rx, 0, sizeof(rx)); |
| rx.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); |
| rx.nodetype = cpu_to_je16(JFFS2_NODETYPE_XATTR); |
| rx.totlen = cpu_to_je32(PAD(totlen)); |
| rx.hdr_crc = cpu_to_je32(crc32(0, &rx, sizeof(struct jffs2_unknown_node) - 4)); |
| |
| rx.xid = cpu_to_je32(xd->xid); |
| rx.version = cpu_to_je32(++xd->version); |
| rx.xprefix = xd->xprefix; |
| rx.name_len = xd->name_len; |
| rx.value_len = cpu_to_je16(xd->value_len); |
| rx.data_crc = cpu_to_je32(crc32(0, vecs[1].iov_base, vecs[1].iov_len)); |
| rx.node_crc = cpu_to_je32(crc32(0, &rx, sizeof(struct jffs2_raw_xattr) - 4)); |
| |
| rc = jffs2_flash_writev(c, vecs, 2, phys_ofs, &length, 0); |
| if (rc || totlen != length) { |
| JFFS2_WARNING("jffs2_flash_writev()=%d, req=%u, wrote=%zu, at %#08x\n", |
| rc, totlen, length, phys_ofs); |
| rc = rc ? rc : -EIO; |
| if (length) |
| jffs2_add_physical_node_ref(c, phys_ofs | REF_OBSOLETE, PAD(totlen), NULL); |
| |
| return rc; |
| } |
| /* success */ |
| jffs2_add_physical_node_ref(c, phys_ofs | REF_PRISTINE, PAD(totlen), (void *)xd); |
| |
| dbg_xattr("success on saving xdatum (xid=%u, version=%u, xprefix=%u, xname='%s')\n", |
| xd->xid, xd->version, xd->xprefix, xd->xname); |
| |
| return 0; |
| } |
| |
| static struct jffs2_xattr_datum *create_xattr_datum(struct jffs2_sb_info *c, |
| int xprefix, const char *xname, |
| const char *xvalue, int xsize) |
| { |
| /* must be called under down_write(xattr_sem) */ |
| struct jffs2_xattr_datum *xd; |
| uint32_t hashkey, name_len; |
| char *data; |
| int i, rc; |
| |
| /* Search xattr_datum has same xname/xvalue by index */ |
| hashkey = xattr_datum_hashkey(xprefix, xname, xvalue, xsize); |
| i = hashkey % XATTRINDEX_HASHSIZE; |
| list_for_each_entry(xd, &c->xattrindex[i], xindex) { |
| if (xd->hashkey==hashkey |
| && xd->xprefix==xprefix |
| && xd->value_len==xsize |
| && !strcmp(xd->xname, xname) |
| && !memcmp(xd->xvalue, xvalue, xsize)) { |
| atomic_inc(&xd->refcnt); |
| return xd; |
| } |
| } |
| |
| /* Not found, Create NEW XATTR-Cache */ |
| name_len = strlen(xname); |
| |
| xd = jffs2_alloc_xattr_datum(); |
| if (!xd) |
| return ERR_PTR(-ENOMEM); |
| |
| data = kmalloc(name_len + 1 + xsize, GFP_KERNEL); |
| if (!data) { |
| jffs2_free_xattr_datum(xd); |
| return ERR_PTR(-ENOMEM); |
| } |
| strcpy(data, xname); |
| memcpy(data + name_len + 1, xvalue, xsize); |
| |
| atomic_set(&xd->refcnt, 1); |
| xd->xid = ++c->highest_xid; |
| xd->flags |= JFFS2_XFLAGS_HOT; |
| xd->xprefix = xprefix; |
| |
| xd->hashkey = hashkey; |
| xd->xname = data; |
| xd->xvalue = data + name_len + 1; |
| xd->name_len = name_len; |
| xd->value_len = xsize; |
| xd->data_crc = crc32(0, data, xd->name_len + 1 + xd->value_len); |
| |
| rc = save_xattr_datum(c, xd); |
| if (rc) { |
| kfree(xd->xname); |
| jffs2_free_xattr_datum(xd); |
| return ERR_PTR(rc); |
| } |
| |
| /* Insert Hash Index */ |
| i = hashkey % XATTRINDEX_HASHSIZE; |
| list_add(&xd->xindex, &c->xattrindex[i]); |
| |
| c->xdatum_mem_usage += (xd->name_len + 1 + xd->value_len); |
| reclaim_xattr_datum(c); |
| |
| return xd; |
| } |
| |
| static void unrefer_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd) |
| { |
| /* must be called under down_write(xattr_sem) */ |
| if (atomic_dec_and_lock(&xd->refcnt, &c->erase_completion_lock)) { |
| unload_xattr_datum(c, xd); |
| xd->flags |= JFFS2_XFLAGS_DEAD; |
| if (xd->node == (void *)xd) { |
| BUG_ON(!(xd->flags & JFFS2_XFLAGS_INVALID)); |
| jffs2_free_xattr_datum(xd); |
| } else { |
| list_add(&xd->xindex, &c->xattr_dead_list); |
| } |
| spin_unlock(&c->erase_completion_lock); |
| |
| dbg_xattr("xdatum(xid=%u, version=%u) was removed.\n", |
| xd->xid, xd->version); |
| } |
| } |
| |
| /* -------- xref related functions ------------------ |
| * verify_xattr_ref(c, ref) |
| * is used to load xref information from medium. Because summary data does not |
| * contain xid/ino, it's necessary to verify once while mounting process. |
| * save_xattr_ref(c, ref) |
| * is used to write xref to medium. If delete marker is marked, it write |
| * a delete marker of xref into medium. |
| * create_xattr_ref(c, ic, xd) |
| * is used to create a new xref and write to medium. |
| * delete_xattr_ref(c, ref) |
| * is used to delete jffs2_xattr_ref. It marks xref XREF_DELETE_MARKER, |
| * and allows GC to reclaim those physical nodes. |
| * jffs2_xattr_delete_inode(c, ic) |
| * is called to remove xrefs related to obsolete inode when inode is unlinked. |
| * jffs2_xattr_free_inode(c, ic) |
| * is called to release xattr related objects when unmounting. |
| * check_xattr_ref_inode(c, ic) |
| * is used to confirm inode does not have duplicate xattr name/value pair. |
| * jffs2_xattr_do_crccheck_inode(c, ic) |
| * is used to force xattr data integrity check during the initial gc scan. |
| * -------------------------------------------------- */ |
| static int verify_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref) |
| { |
| struct jffs2_eraseblock *jeb; |
| struct jffs2_raw_node_ref *raw; |
| struct jffs2_raw_xref rr; |
| 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); |
| } |