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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [fs/] [ntfs/] [attr.c] - Rev 1275
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/* * attr.c * * Copyright (C) 1996-1999 Martin von Löwis * Copyright (C) 1996-1997 Régis Duchesne * Copyright (C) 1998 Joseph Malicki * Copyright (C) 1999 Steve Dodd * Copyright (C) 2001 Anton Altaparmakov (AIA) */ #include "ntfstypes.h" #include "struct.h" #include "attr.h" #include <linux/errno.h> #include <linux/ntfs_fs.h> #include "macros.h" #include "support.h" #include "util.h" #include "super.h" #include "inode.h" #include "unistr.h" /** * ntfs_find_attr_in_mft_rec - find attribute in mft record * @vol: volume on which attr resides * @m: mft record to search * @type: attribute type to find * @name: attribute name to find (optional, i.e. NULL means don't care) * @name_len: attribute name length (only needed if @name present) * @ic: ignore case if 1 or case sensitive if 0 (ignored if @name NULL) * @instance: instance number to find * * Only search the specified mft record and it ignores the presence of an * attribute list attribute (unless it is the one being searched for, * obviously, in which case it is returned). */ ntfs_u8* ntfs_find_attr_in_mft_rec(ntfs_volume *vol, ntfs_u8 *m, __u32 type, wchar_t *name, __u32 name_len, int ic, __u16 instance) { ntfs_u8 *a; /* Iterate over attributes in mft record @m. */ a = m + NTFS_GETU16(m + 20); /* attrs_offset */ for (; a >= m && a <= m + vol->mft_record_size; a += NTFS_GETU32(a + 4 /* length */)) { /* We catch $END with this more general check, too... */ if (NTFS_GETU32(a + 0 /* type */) > type) return NULL; if (!NTFS_GETU32(a + 4 /* length */)) break; if (NTFS_GETU32(a + 0 /* type */) != type) continue; /* If @name is present, compare the two names. */ if (name && !ntfs_are_names_equal(name, name_len, (wchar_t*) (a + NTFS_GETU16(a + 10 /* name_offset */)), a[9] /* name_length */, ic, vol->upcase, vol->upcase_length)) { register int rc; rc = ntfs_collate_names(vol->upcase, vol->upcase_length, name, name_len, (wchar_t*)(a + NTFS_GETU16(a + 10 /* name_offset */)), a[9] /* name_length */, 1, 1); /* * If @name collates before a->name, there is no * matching attribute. */ if (rc == -1) return NULL; /* If the strings are not equal, continue search. */ if (rc) continue; rc = ntfs_collate_names(vol->upcase, vol->upcase_length, name, name_len, (wchar_t*)(a + NTFS_GETU16(a + 10 /* name_offset */)), a[9] /* name_length */, 0, 1); if (rc == -1) return NULL; if (rc) continue; } /* * The names match or @name not present. Check instance number. * and if it matches we have found the attribute and are done. */ if (instance != NTFS_GETU16(a + 14 /* instance */)) continue; ntfs_debug(DEBUG_FILE3, "ntfs_find_attr_in_mft_record: found: " "attr type 0x%x, instance number = 0x%x.\n", NTFS_GETU32(a + 0), instance); return a; } ntfs_error("ntfs_find_attr_in_mft_record: mft record 0x%x is corrupt" ". Run chkdsk.\n", m); return NULL; } /* Look if an attribute already exists in the inode, and if not, create it. */ int ntfs_new_attr(ntfs_inode *ino, int type, void *name, int namelen, void *value, int value_len, int *pos, int *found) { int do_insert = 0; int i, m; ntfs_attribute *a; for (i = 0; i < ino->attr_count; i++) { a = ino->attrs + i; if (a->type < type) continue; if (a->type > type) { do_insert = 1; break; } /* If @name is present, compare the two names. */ if (namelen && !ntfs_are_names_equal((wchar_t*)name, namelen, a->name, a->namelen /* name_length */, 1 /* ignore case*/, ino->vol->upcase, ino->vol->upcase_length)) { register int rc; rc = ntfs_collate_names(ino->vol->upcase, ino->vol->upcase_length, a->name, a->namelen, (wchar_t*)name, namelen, 1 /* ignore case */, 1); if (rc == -1) continue; if (rc == 1) { do_insert = 1; break; } rc = ntfs_collate_names(ino->vol->upcase, ino->vol->upcase_length, a->name, a->namelen, (wchar_t*)name, namelen, 0 /* case sensitive */, 1); if (rc == -1) continue; if (rc == 1) { do_insert = 1; break; } } /* Names are equal or no name was asked for. */ /* If a value was specified compare the values. */ if (value_len && a->resident) { if (!a->resident) { ntfs_error("ntfs_new_attr: Value specified but " "attribute non-resident. Bug!\n"); return -EINVAL; } m = value_len; if (m > a->size) m = a->size; m = memcmp(value, a->d.data, m); if (m > 0) continue; if (m < 0) { do_insert = 1; break; } /* Values match until min of value lengths. */ if (value_len > a->size) continue; if (value_len < a->size) { do_insert = 1; break; } } /* Full match! */ *found = 1; *pos = i; return 0; } /* Re-allocate space. */ if (ino->attr_count % 8 == 0) { ntfs_attribute* new; new = (ntfs_attribute*)ntfs_malloc((ino->attr_count + 8) * sizeof(ntfs_attribute)); if (!new) return -ENOMEM; if (ino->attrs) { ntfs_memcpy(new, ino->attrs, ino->attr_count * sizeof(ntfs_attribute)); ntfs_free(ino->attrs); } ino->attrs = new; } if (do_insert) ntfs_memmove(ino->attrs + i + 1, ino->attrs + i, (ino->attr_count - i) * sizeof(ntfs_attribute)); ino->attr_count++; ino->attrs[i].type = type; ino->attrs[i].namelen = namelen; ino->attrs[i].name = name; *pos = i; *found = 0; return 0; } int ntfs_make_attr_resident(ntfs_inode *ino, ntfs_attribute *attr) { __s64 size = attr->size; if (size > 0) { /* FIXME: read data, free clusters */ return -EOPNOTSUPP; } attr->resident = 1; return 0; } /* Store in the inode readable information about a run. */ int ntfs_insert_run(ntfs_attribute *attr, int cnum, ntfs_cluster_t cluster, int len) { /* (re-)allocate space if necessary. */ if ((attr->d.r.len * sizeof(ntfs_runlist)) % PAGE_SIZE == 0) { ntfs_runlist* new; unsigned long new_size; ntfs_debug(DEBUG_MALLOC, "ntfs_insert_run: re-allocating " "space: old attr->d.r.len = 0x%x\n", attr->d.r.len); new_size = attr->d.r.len * sizeof(ntfs_runlist) + PAGE_SIZE; if ((new_size >> PAGE_SHIFT) > num_physpages) { ntfs_error("ntfs_insert_run: attempted to allocate " "more pages than num_physpages." "This might be a bug or a corrupt" "file system.\n"); return -1; } new = ntfs_vmalloc(new_size); if (!new) { ntfs_error("ntfs_insert_run: ntfs_vmalloc(new_size = " "0x%x) failed\n", new_size); return -1; } if (attr->d.r.runlist) { ntfs_memcpy(new, attr->d.r.runlist, attr->d.r.len * sizeof(ntfs_runlist)); ntfs_vfree(attr->d.r.runlist); } attr->d.r.runlist = new; } if (attr->d.r.len > cnum) ntfs_memmove(attr->d.r.runlist + cnum + 1, attr->d.r.runlist + cnum, (attr->d.r.len - cnum) * sizeof(ntfs_runlist)); attr->d.r.runlist[cnum].lcn = cluster; attr->d.r.runlist[cnum].len = len; attr->d.r.len++; return 0; } /** * ntfs_extend_attr - extend allocated size of an attribute * @ino: ntfs inode containing the attribute to extend * @attr: attribute which to extend * @len: desired new length for @attr (_not_ the amount to extend by) * * Extends an attribute. Allocate clusters on the volume which @ino belongs to. * Extends the run list accordingly, preferably by extending the last run of * the existing run list, first. * * Only modifies attr->allocated, i.e. doesn't touch attr->size, nor * attr->initialized. */ int ntfs_extend_attr(ntfs_inode *ino, ntfs_attribute *attr, const __s64 len) { int rlen, rl2_len, err = 0; ntfs_cluster_t cluster, clen; ntfs_runlist *rl, *rl2; if ((attr->flags & (ATTR_IS_COMPRESSED | ATTR_IS_ENCRYPTED)) || ino->record_count > 1) return -EOPNOTSUPP; /* * FIXME: Don't make non-resident if the attribute type is not right. * For example cannot make index attribute non-resident! (AIA) */ if (attr->resident) { err = ntfs_make_attr_nonresident(ino, attr); if (err) return err; } if (len <= attr->allocated) return 0; /* Truly stupid things do sometimes happen. */ rl = attr->d.r.runlist; rlen = attr->d.r.len; if (rlen > 0) cluster = rl[rlen - 1].lcn + rl[rlen - 1].len; else /* No preference for allocation space. */ cluster = (ntfs_cluster_t)-1; /* * Calculate the extra space we need, and round up to multiple of * cluster size to get number of new clusters needed. */ clen = (len - attr->allocated + ino->vol->cluster_size - 1) >> ino->vol->cluster_size_bits; if (!clen) return 0; err = ntfs_allocate_clusters(ino->vol, &cluster, &clen, &rl2, &rl2_len, DATA_ZONE); if (err) return err; attr->allocated += (__s64)clen << ino->vol->cluster_size_bits; if (rlen > 0) { err = splice_runlists(&rl, &rlen, rl2, rl2_len); ntfs_vfree(rl2); if (err) return err; } else { if (rl) ntfs_vfree(rl); rl = rl2; rlen = rl2_len; } attr->d.r.runlist = rl; attr->d.r.len = rlen; return 0; } int ntfs_make_attr_nonresident(ntfs_inode *ino, ntfs_attribute *attr) { int error; ntfs_io io; void *data = attr->d.data; __s64 len = attr->size; attr->d.r.len = 0; attr->d.r.runlist = NULL; attr->resident = 0; /* * ->allocated is updated by ntfs_extend_attr(), while ->initialized * and ->size are updated by ntfs_readwrite_attr(). (AIA) */ attr->allocated = attr->initialized = 0; error = ntfs_extend_attr(ino, attr, len); if (error) return error; /* FIXME: On error, restore old values. */ io.fn_put = ntfs_put; io.fn_get = ntfs_get; io.param = data; io.size = len; io.do_read = 0; return ntfs_readwrite_attr(ino, attr, 0, &io); } int ntfs_attr_allnonresident(ntfs_inode *ino) { int i, error = 0; ntfs_volume *vol = ino->vol; for (i = 0; !error && i < ino->attr_count; i++) { if (ino->attrs[i].type != vol->at_security_descriptor && ino->attrs[i].type != vol->at_data) continue; error = ntfs_make_attr_nonresident(ino, ino->attrs + i); } return error; } /* * Resize the attribute to a newsize. attr->allocated and attr->size are * updated, but attr->initialized is not changed unless it becomes bigger than * attr->size, in which case it is set to attr->size. */ int ntfs_resize_attr(ntfs_inode *ino, ntfs_attribute *attr, __s64 newsize) { int error = 0; __s64 oldsize = attr->size; int clustersizebits = ino->vol->cluster_size_bits; int i, count, newcount; ntfs_runlist *rl, *rlt; if (newsize == oldsize) return 0; if (attr->flags & (ATTR_IS_COMPRESSED | ATTR_IS_ENCRYPTED)) return -EOPNOTSUPP; if (attr->resident) { void *v; if (newsize > ino->vol->mft_record_size) { error = ntfs_make_attr_nonresident(ino, attr); if (error) return error; return ntfs_resize_attr(ino, attr, newsize); } v = attr->d.data; if (newsize) { __s64 minsize = newsize; attr->d.data = ntfs_malloc(newsize); if (!attr->d.data) { ntfs_free(v); return -ENOMEM; } if (newsize > oldsize) { minsize = oldsize; ntfs_bzero((char*)attr->d.data + oldsize, newsize - oldsize); } ntfs_memcpy((char*)attr->d.data, v, minsize); } else attr->d.data = 0; ntfs_free(v); attr->size = newsize; return 0; } /* Non-resident attribute. */ rl = attr->d.r.runlist; if (newsize < oldsize) { int rl_size; /* * FIXME: We might be going awfully wrong for newsize = 0, * possibly even leaking memory really badly. But considering * in that case there is more breakage due to -EOPNOTSUPP stuff * further down the code path, who cares for the moment... (AIA) */ for (i = 0, count = 0; i < attr->d.r.len; i++) { if ((__s64)(count + rl[i].len) << clustersizebits > newsize) { i++; break; } count += (int)rl[i].len; } newcount = count; /* Free unused clusters in current run, unless sparse. */ if (rl[--i].lcn != (ntfs_cluster_t)-1) { ntfs_cluster_t rounded = newsize - ((__s64)count << clustersizebits); rounded = (rounded + ino->vol->cluster_size - 1) >> clustersizebits; error = ntfs_deallocate_cluster_run(ino->vol, rl[i].lcn + rounded, rl[i].len - rounded); if (error) return error; /* FIXME: Incomplete operation. */ rl[i].len = rounded; newcount = count + rounded; } /* Free all other runs. */ i++; error = ntfs_deallocate_clusters(ino->vol, rl + i, attr->d.r.len - i); if (error) return error; /* FIXME: Incomplete operation. */ /* * Free space for extra runs in memory if enough memory left * to do so. FIXME: Only do it if it would free memory. (AIA) */ rl_size = ((i + 1) * sizeof(ntfs_runlist) + PAGE_SIZE - 1) & PAGE_MASK; if (rl_size < ((attr->d.r.len * sizeof(ntfs_runlist) + PAGE_SIZE - 1) & PAGE_MASK)) { rlt = ntfs_vmalloc(rl_size); if (rlt) { ntfs_memcpy(rlt, rl, i * sizeof(ntfs_runlist)); ntfs_vfree(rl); attr->d.r.runlist = rl = rlt; } } rl[i].lcn = (ntfs_cluster_t)-1; rl[i].len = (ntfs_cluster_t)0; attr->d.r.len = i; } else { error = ntfs_extend_attr(ino, attr, newsize); if (error) return error; /* FIXME: Incomplete operation. */ newcount = (newsize + ino->vol->cluster_size - 1) >> clustersizebits; } /* Fill in new sizes. */ attr->allocated = (__s64)newcount << clustersizebits; attr->size = newsize; if (attr->initialized > newsize) attr->initialized = newsize; if (!newsize) error = ntfs_make_attr_resident(ino, attr); return error; } int ntfs_create_attr(ntfs_inode *ino, int anum, char *aname, void *data, int dsize, ntfs_attribute **rattr) { void *name; int namelen; int found, i; int error; ntfs_attribute *attr; if (dsize > ino->vol->mft_record_size) /* FIXME: Non-resident attributes. */ return -EOPNOTSUPP; if (aname) { namelen = strlen(aname); name = ntfs_malloc(2 * namelen); if (!name) return -ENOMEM; ntfs_ascii2uni(name, aname, namelen); } else { name = 0; namelen = 0; } error = ntfs_new_attr(ino, anum, name, namelen, data, dsize, &i, &found); if (error || found) { ntfs_free(name); return error ? error : -EEXIST; } *rattr = attr = ino->attrs + i; /* Allocate a new number. * FIXME: Should this happen on inode writeback? * FIXME: Extension records not supported. */ error = ntfs_allocate_attr_number(ino, &i); if (error) return error; attr->attrno = i; if (attr->attrno + 1 != NTFS_GETU16(ino->attr + 0x28)) ntfs_error("UH OH! attr->attrno (%i) != NTFS_GETU16(ino->attr " "+ 0x28) (%i)\n", attr->attrno, NTFS_GETU16(ino->attr + 0x28)); attr->resident = 1; attr->flags = 0; attr->cengine = 0; attr->size = attr->allocated = attr->initialized = dsize; /* FIXME: INDEXED information should come from $AttrDef * Currently, only file names are indexed. As of NTFS v3.0 (Win2k), * this is no longer true. Different attributes can be indexed now. */ if (anum == ino->vol->at_file_name) attr->indexed = 1; else attr->indexed = 0; attr->d.data = ntfs_malloc(dsize); if (!attr->d.data) return -ENOMEM; ntfs_memcpy(attr->d.data, data, dsize); return 0; } /* * Non-resident attributes are stored in runs (intervals of clusters). * * This function stores in the inode readable information about a non-resident * attribute. */ static int ntfs_process_runs(ntfs_inode *ino, ntfs_attribute* attr, unsigned char *data) { int startvcn, endvcn; int vcn, cnum; ntfs_cluster_t cluster; int len, ctype; int er = 0; startvcn = NTFS_GETS64(data + 0x10); endvcn = NTFS_GETS64(data + 0x18); /* Check whether this chunk really belongs to the end. Problem with * this: this functions can get called on the last extent first, before * it is called on the other extents in sequence. This happens when the * base mft record contains the last extent instead of the first one * and the first extent is stored, like any intermediate extents in * extension mft records. This would be difficult to allow the way the * runlist is stored in memory. Thus we fix elsewhere by causing the * attribute list attribute to be processed immediately when found. The * extents will then be processed starting with the first one. */ for (cnum = 0, vcn = 0; cnum < attr->d.r.len; cnum++) vcn += attr->d.r.runlist[cnum].len; if (vcn != startvcn) { ntfs_debug(DEBUG_FILE3, "ntfs_process_runs: ino = 0x%x, " "attr->type = 0x%x, startvcn = 0x%x, endvcn = 0x%x, " "vcn = 0x%x, cnum = 0x%x\n", ino->i_number, attr->type, startvcn, endvcn, vcn, cnum); if (vcn < startvcn) { ntfs_error("Problem with runlist in extended record\n"); return -1; } /* Tried to insert an already inserted runlist. */ return 0; } if (!endvcn) { if (!startvcn) { /* Allocated length. */ endvcn = NTFS_GETS64(data + 0x28) - 1; endvcn >>= ino->vol->cluster_size_bits; } else { /* This is an extent. Allocated length is not defined! * Extents must have an endvcn though so this is an * error. */ ntfs_error("Corrupt attribute extent. (endvcn is " "missing)\n"); return -1; } } data = data + NTFS_GETU16(data + 0x20); cnum = attr->d.r.len; cluster = 0; for (vcn = startvcn; vcn <= endvcn; vcn += len) { if (ntfs_decompress_run(&data, &len, &cluster, &ctype)) { ntfs_debug(DEBUG_FILE3, "ntfs_process_runs: " "ntfs_decompress_run failed. i_number = 0x%x\n", ino->i_number); return -1; } if (ctype) er = ntfs_insert_run(attr, cnum, -1, len); else er = ntfs_insert_run(attr, cnum, cluster, len); if (er) break; cnum++; } if (er) ntfs_error("ntfs_process_runs: ntfs_insert_run failed\n"); ntfs_debug(DEBUG_FILE3, "ntfs_process_runs: startvcn = 0x%x, vcn = 0x%x" ", endvcn = 0x%x, cnum = %i\n", startvcn, vcn, endvcn, cnum); return er; } /* Insert the attribute starting at attr in the inode ino. */ int ntfs_insert_attribute(ntfs_inode *ino, unsigned char *attrdata) { int i, found; int type; short int *name; int namelen; void *data; ntfs_attribute *attr; int error; type = NTFS_GETU32(attrdata); namelen = NTFS_GETU8(attrdata + 9); ntfs_debug(DEBUG_FILE3, "ntfs_insert_attribute: ino->i_number 0x%x, " "attr type 0x%x\n", ino->i_number, type); /* Read the attribute's name if it has one. */ if (!namelen) name = 0; else { /* 1 Unicode character fits in 2 bytes. */ name = ntfs_malloc(2 * namelen); if (!name) return -ENOMEM; ntfs_memcpy(name, attrdata + NTFS_GETU16(attrdata + 10), 2 * namelen); } /* If resident look for value, too. */ if (NTFS_GETU8(attrdata + 8) == 0) error = ntfs_new_attr(ino, type, name, namelen, attrdata + NTFS_GETU16(attrdata + 0x14), NTFS_GETU16(attrdata + 0x10), &i, &found); else error = ntfs_new_attr(ino, type, name, namelen, NULL, 0, &i, &found); if (error) { ntfs_debug(DEBUG_FILE3, "ntfs_insert_attribute: ntfs_new_attr " "failed.\n"); if (name) ntfs_free(name); return error; } if (found) { /* It's already there, if not resident just process the runs. */ if (!ino->attrs[i].resident) { ntfs_debug(DEBUG_FILE3, "ntfs_insert_attribute:" " processing runs 1.\n"); /* FIXME: Check error code! (AIA) */ ntfs_process_runs(ino, ino->attrs + i, attrdata); } return 0; } attr = ino->attrs + i; attr->resident = NTFS_GETU8(attrdata + 8) == 0; attr->flags = *(__u16*)(attrdata + 0xC); attr->attrno = NTFS_GETU16(attrdata + 0xE); if (attr->resident) { attr->size = NTFS_GETU16(attrdata + 0x10); data = attrdata + NTFS_GETU16(attrdata + 0x14); attr->d.data = (void*)ntfs_malloc(attr->size); if (!attr->d.data) return -ENOMEM; ntfs_memcpy(attr->d.data, data, attr->size); attr->indexed = NTFS_GETU8(attrdata + 0x16); } else { attr->allocated = NTFS_GETS64(attrdata + 0x28); attr->size = NTFS_GETS64(attrdata + 0x30); attr->initialized = NTFS_GETS64(attrdata + 0x38); attr->cengine = NTFS_GETU16(attrdata + 0x22); if (attr->flags & ATTR_IS_COMPRESSED) attr->compsize = NTFS_GETS64(attrdata + 0x40); ntfs_debug(DEBUG_FILE3, "ntfs_insert_attribute: " "attr->allocated = 0x%Lx, attr->size = 0x%Lx, " "attr->initialized = 0x%Lx\n", attr->allocated, attr->size, attr->initialized); ino->attrs[i].d.r.runlist = 0; ino->attrs[i].d.r.len = 0; ntfs_debug(DEBUG_FILE3, "ntfs_insert_attribute: processing " "runs 2.\n"); /* FIXME: Check error code! (AIA) */ ntfs_process_runs(ino, attr, attrdata); } return 0; } int ntfs_read_zero(ntfs_io *dest, int size) { int i; char *sparse = ntfs_calloc(512); if (!sparse) return -ENOMEM; i = 512; while (size) { if (i > size) i = size; dest->fn_put(dest, sparse, i); size -= i; } ntfs_free(sparse); return 0; } /* Process compressed attributes. */ int ntfs_read_compressed(ntfs_inode *ino, ntfs_attribute *attr, __s64 offset, ntfs_io *dest) { int error = 0; int clustersizebits; int s_vcn, rnum, vcn, got, l1; __s64 copied, len, chunk, offs1, l, chunk2; ntfs_cluster_t cluster, cl1; char *comp = 0, *comp1; char *decomp = 0; ntfs_io io; ntfs_runlist *rl; l = dest->size; clustersizebits = ino->vol->cluster_size_bits; /* Starting cluster of potential chunk. There are three situations: a) In a large uncompressible or sparse chunk, s_vcn is in the middle of a run. b) s_vcn is right on a run border. c) When several runs make a chunk, s_vcn is before the chunks. */ s_vcn = offset >> clustersizebits; /* Round down to multiple of 16. */ s_vcn &= ~15; rl = attr->d.r.runlist; for (rnum = vcn = 0; rnum < attr->d.r.len && vcn + rl->len <= s_vcn; rnum++, rl++) vcn += rl->len; if (rnum == attr->d.r.len) { /* Beyond end of file. */ /* FIXME: Check allocated / initialized. */ dest->size = 0; return 0; } io.do_read = 1; io.fn_put = ntfs_put; io.fn_get = 0; cluster = rl->lcn; len = rl->len; copied = 0; while (l) { chunk = 0; if (cluster == (ntfs_cluster_t)-1) { /* Sparse cluster. */ __s64 ll; if ((len - (s_vcn - vcn)) & 15) ntfs_error("Unexpected sparse chunk size."); ll = ((__s64)(vcn + len) << clustersizebits) - offset; if (ll > l) ll = l; chunk = ll; error = ntfs_read_zero(dest, ll); if (error) goto out; } else if (dest->do_read) { if (!comp) { comp = ntfs_malloc(16 << clustersizebits); if (!comp) { error = -ENOMEM; goto out; } } got = 0; /* We might need to start in the middle of a run. */ cl1 = cluster + s_vcn - vcn; comp1 = comp; do { int delta; io.param = comp1; delta = s_vcn - vcn; if (delta < 0) delta = 0; l1 = len - delta; if (l1 > 16 - got) l1 = 16 - got; io.size = (__s64)l1 << clustersizebits; error = ntfs_getput_clusters(ino->vol, cl1, 0, &io); if (error) goto out; if (l1 + delta == len) { rnum++; rl++; vcn += len; cluster = cl1 = rl->lcn; len = rl->len; } got += l1; comp1 += (__s64)l1 << clustersizebits; } while (cluster != (ntfs_cluster_t)-1 && got < 16); /* Until empty run. */ chunk = 16 << clustersizebits; if (cluster != (ntfs_cluster_t)-1 || got == 16) /* Uncompressible */ comp1 = comp; else { if (!decomp) { decomp = ntfs_malloc(16 << clustersizebits); if (!decomp) { error = -ENOMEM; goto out; } } /* Make sure there are null bytes after the * last block. */ *(ntfs_u32*)comp1 = 0; ntfs_decompress(decomp, comp, chunk); comp1 = decomp; } offs1 = offset - ((__s64)s_vcn << clustersizebits); chunk2 = (16 << clustersizebits) - offs1; if (chunk2 > l) chunk2 = l; if (chunk > chunk2) chunk = chunk2; dest->fn_put(dest, comp1 + offs1, chunk); } l -= chunk; copied += chunk; offset += chunk; s_vcn = (offset >> clustersizebits) & ~15; if (l && offset >= ((__s64)(vcn + len) << clustersizebits)) { rnum++; rl++; vcn += len; cluster = rl->lcn; len = rl->len; } } out: if (comp) ntfs_free(comp); if (decomp) ntfs_free(decomp); dest->size = copied; return error; } int ntfs_write_compressed(ntfs_inode *ino, ntfs_attribute *attr, __s64 offset, ntfs_io *dest) { return -EOPNOTSUPP; }
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