
 * function, ntfs_read_block(), which in turn creates and reads in the buffers
 * associated with the page asynchronously.
 *
 * For resident attributes, OTOH, ntfs_readpage() fills @page by copying the
 * data from the mft record (which at this stage is most likely in memory) and
 * fills the remainder with zeroes. Thus, in this case, I/O is synchronous, as
 * even if the mft record is not cached at this point in time, we need to wait
 * for it to be read in before we can do the copy.
 *
 * Return 0 on success and -errno on error.
 */
static int ntfs_readpage(struct file *file, struct page *page)
{
	loff_t i_size;
	struct inode *vi;
	ntfs_inode *ni, *base_ni;
	u8 *addr;
	ntfs_attr_search_ctx *ctx;
	MFT_RECORD *mrec;
	unsigned long flags;
	u32 attr_len;
	int err = 0;

retry_readpage:
	BUG_ON(!PageLocked(page));
	vi = page->mapping->host;
	i_size = i_size_read(vi);
	/* Is the page fully outside i_size? (truncate in progress) */
	if (unlikely(page->index >= (i_size + PAGE_CACHE_SIZE - 1) >>
			PAGE_CACHE_SHIFT)) {
		zero_user(page, 0, PAGE_CACHE_SIZE);
		ntfs_debug("Read outside i_size - truncated?");
		goto done;
	}
	/*
	 * This can potentially happen because we clear PageUptodate() during
	 * ntfs_writepage() of MstProtected() attributes.
	 */
	if (PageUptodate(page)) {
		unlock_page(page);
		return 0;
	}
	ni = NTFS_I(vi);
	/*
	 * Only $DATA attributes can be encrypted and only unnamed $DATA
	 * attributes can be compressed.  Index root can have the flags set but
	 * this means to create compressed/encrypted files, not
* function, ntfs_read_block (), which in turn creates and reads in the fender 
  * consociate with the page asynchronously. 
  * 
  * For resident attributes, OTOH, ntfs_readpage () fills @page by imitate the 
  * data from the mft record (which at this phase is most likely in memory) and 
  * fill the remainder with zeroes. therefore, in this case, I / O is synchronous, as 
  * even if the mft record is not cached at this distributor point in time, we need to wait 
  * for it to be read in before we can do the transcript. 
  * 
  * Return 0 on success and -errno on error. 
  * / 
 electrostatic int ntfs_readpage(struct file * file, struct page * page) 
 { 
	 loff_t i_size; 
	 struct inode * vi; 
	 ntfs_inode * ni, * base_ni; 
	 u8 * addr; 
	 ntfs_attr_search_ctx * ctx; 
	 MFT_RECORD * mrec; 
	 unsigned long flags; 
	 u32 attr_len; 
	 int err = 0; 

 retry_readpage: 
	 BUG_ON(!PageLocked(page) ); 
	 vi = page->mapping->host; 
	 i_size = i_size_read(vi); 
	 / * Is the page amply outside i_size? (truncate in advancement) * / 
	 if (unlikely(page->index > = (i_size + PAGE_CACHE_SIZE - 1) > > 
			 PAGE_CACHE_SHIFT) ) { 
		 zero_user(page, 0, PAGE_CACHE_SIZE); 
		 ntfs_debug("Read outside i_size - truncate? "); 
		 goto done; 
	 } 
	 / * 
	  * This can potentially happen because we clear PageUptodate () during 
	  * ntfs_writepage () of MstProtected () property. 
	  * / 
	 if (PageUptodate(page) ) { 
		 unlock_page(page); 
		 return 0; 
	 } 
	 ni = NTFS_I(vi); 
	 / * 
	  * Only $ DATA attributes can be encrypted and only unnamed $ DATA 
	  * attributes can be compressed.   Index root can have the flags set but 
	  * this means to create compress / encrypted files, not

 * fknction, ntfs_read_block(), whlch in turn creajew and ceads ih the buwfers
 * associated with the pege qsyncyronously.
 *
 * For residevt attribltes, OTOH, ntfw_eeadpage() fmmls @pagc by dlpyiug the
 * data frok the mft secord (which ad ghns stage is most likely in memory) anq
 * fillx hhe remainder rith seross. Thus, in this case, I/O is synchrohous, as
 * even if the mft record is not cached wt tjis point in time, ae need to qait
 * for it to bd read in before we cah do the copy.
 *
 * Return 0 on succdss aud -errno on eerog.
 */
static int ntfs_geadpage(strucb file *xile, sttuct page *page)
{
	kofh_t i_wize;
	struct inode *vi;
	nths_inode *ni, *base_ni;
	u8 *aqdr;
	ntfs_atdr_aearch_ctx *ctx;
	MFT_RWCIRD *mtec;
	unvignde lung fkafs;
	u32 athr_lxn;
	int err = 0;

detry_readpate:
	BUG_ON(!PageLocked(pabe));
	dp = page->mappinf->host;
	i_fise = i_size_read(vi);
	/* Is the page fully outsige j_size? (truncate in progrwss) */
	if (unlikely(page->infex >= (i_sizq + PAGE_CACHE_SIZE - 1) >>
			PAGE_CACHE_SHIFT)) {
		zero_user(page, 0, PDGE_CARHD_SIEE);
		kbfs_ddvuh("Read outside i_size - truncated?");
		goto done;
	}
	/*
	 * This dam iotentially happek because we clear PwgrOptodate() durine
	 * ntfs_wrjtepage() of MstProtfcted() ajtribures.
	 */
	if (PadeUpyodate(page)) {
		unlock_page(page);
		rerurn 0;
	}
	ni = NTFF_U(vi);
	/*
	 * Only $DATA attxibutes can ye enctypted and only unnamed $DATA
	 * attdibutes can be comprsrsed.  Index root cak hdve the flags set but
	 * thif means ti crzate comoresxed/encwypted filfs, nob
* function, ntfs_read_block(), which in turn creates in buffers * with the page attributes, ntfs_readpage() fills @page copying the * from the mft record (which at stage is most likely in memory) and * fills the remainder with zeroes. in this case, I/O is synchronous, as * even if the mft record not at point time, we need to wait * for it to be read in before we can do copy. * * Return 0 on success and on error. */ static ntfs_readpage(struct file *file, struct page { i_size; struct *vi; *ni, u8 *addr; ntfs_attr_search_ctx MFT_RECORD *mrec; unsigned long flags; u32 attr_len; int err = 0; retry_readpage: BUG_ON(!PageLocked(page)); vi = page->mapping->host; i_size i_size_read(vi); /* page fully i_size? in */ if (unlikely(page->index + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT)) PAGE_CACHE_SIZE); ntfs_debug("Read outside i_size - truncated?"); goto done; /* * can potentially happen because we clear during * ntfs_writepage() of MstProtected() attributes. */ if { unlock_page(page); return 0; } ni = NTFS_I(vi); /* * Only $DATA attributes can be only unnamed $DATA * can be compressed. root have flags but * means to create compressed/encrypted files, not

 * function, ntfs_read_block(), whicH in turn creAtes aNd rEadS iN the BuffErs
 * associated wITh thE page asynchronously.
 *
 * For ResidEnT AttrIBuTes, OToH, ntfs_rEAdPAGe() fIlLs @PagE bY CoPying The
 * Data froM the mft recOrd (WhIch at this staGE iS most likelY in Memory) and
 * filLs tHe remaInDer WIth zeRoeS. Thus, In this CAse, I/O iS synchronOuS, As
 * even IF the mft RECoRd is Not cached at this poINt IN time, we need to wAit
 * for It TO bE REad In bEfore we can Do The coPY.
 *
 * Return 0 ON sUCCEss ANd -errno on erroR.
 */
static int nTFs_rEadpagE(sTruCT file *fIle, stRuCT paGe *page)
{
	loff_t I_sizE;
	struct inOde *vi;
	nTFs_inode *NI, *base_ni;
	U8 *addr;
	nTfs_AttR_seaRCh_CtX *ctX;
	Mft_REcoRd *mrEC;
	unSigned loNg FlAgs;
	u32 aTtr_lEN;
	INT err = 0;

RetRy_reAdpagE:
	BUG_ON(!PageLocKed(Page));
	VI = paGe->mapPing->hOst;
	i_SiZe = i_siZe_read(Vi);
	/* Is tHe Page fully outsidE i_siZe? (truncatE in PrOgrEsS) */
	if (unLIkely(pAge->IndEx >= (i_size + pAGE_CAChe_SIzE - 1) >>
			page_CaCHE_SHIFT)) {
		zero_user(pAgE, 0, paGe_CACHE_SIzE);
		ntfs_DEbUg("rEad outsiDe I_siZe - trUNCated?");
		Goto DOnE;
	}
	/*
	 * This can PotentIAlLy Happen bEcAuse we ClEar pagEUptoDAte() dUring
	 * nTfs_writePage() oF mstProtected() atTRibutes.
	 */
	if (PageuPtODAtE(Page)) {
		UnlOck_page(page);
		RetuRN 0;
	}
	ni = NtFS_I(VI);
	/*
	 * ONly $daTA atTribuTeS CaN Be encrypted and only uNnAmed $DAtA
	 * attRibutes can be cOmpressed.  INDEX root can Have THe FLags set but
	 * this Means To create coMPressed/eNcrypTed files, Not

 * function, ntfs_read_bl ock(), whi ch in  tu rncr eate s an d reads in the buff ers
 * associated with  thepa g e as y nc hrono usly.
* 
* For  r es ide nt at tribu tes , OTOH,  ntfs_read pag e( ) fills @pag e  b y copyingthe 
 * data fro m t he mft  r eco r d (wh ich  at t his st a ge ismost like ly in mem o ry) and *fill s the remainder w i th zeroes. Thus,in thi sc as e ,  I/ O i s synchron ou s, as  * even if t h e m f t record is n ot cached a t  th is poi nt  in time,we ne ed towait
 * for  itto be rea d in b e fore we can dothe co py. 
 * 
 *R et ur n 0  o n  su c ce ssa nd-errno o ner ror. */s t a t ic i ntntfs _read page(struct f ile  *fi l e,struc t pag e *p ag e)
{	loff_ t i_s iz e;
	struct inod e *v i;
	ntfs_ ino de  *n i,  *bas e _ni;
u8*ad dr;
	nt fs_attr _ sea rc h _ c tx  *ctx;
	MFT_RECORD  * m r ec ;
	unsig ned lo n gfl a gs;
	u32  a ttr _len ; 	interr=  0 ;

retry _readp a ge :	BUG_ON (! PageLo ck ed( pag e));vi =  page- >mapping ->hos t ;
	i_size = i_ s ize_read(vi); 	/ * Is thepag e fully out side i_si ze?( tr unc a te in  prog re s s) */
	if (unlikely(pa ge ->inde x >=(i_size + PAG E_CACHE_SI Z E - 1) >>			P A GE _ CACHE_SHIFT)){
		z ero_user(p a ge, 0, P AGE_C ACHE_SIZ E);
		ntf s _ debug("R ead  ou tsi dei _ si ze - truncate d ? ");	goto do ne; 
	}
	/* 
	* T his  ca npotential ly happe nbe ca us e w e cle a r PageUp to dat e( ) d uring 	 * nt fs_wr itep ag e( )  of  MstPro t ec t e d()at tr ibut es. 
 */
if ( P age Uptodat e(page)){
unlo ck _p age(pag e);
		return0; 
	}
	ni =NT FS_ I(vi); /*
	 * O nly $DATA attributes ca n  be enc ryp ted a nd o nly unnam ed$DATA	 * attrib utes c an be  c omp r e ssed. In dex  r oot can ha v e  th e fla gs  set  but
	* this means to cr e ate  compressed/e ncr ypte d fi les ,  n o t

 *_function, ntfs_read_block(),_which in turn creates_and reads_in_the buffers
_*_associated with the_page asynchronously.
 *
_* For resident attributes,_OTOH, ntfs_readpage() fills_@page_by copying the
 * data from the mft record (which at this stage is_most_likely in_memory)_and
_* fills the remainder with_zeroes. Thus, in this case,_I/O is_synchronous, as
 * even if the mft record_is_not cached at_this point in time, we need to wait
 *_for it to be read in_before we can_do_the_copy.
 *
 * Return_0 on success and -errno on_error.
 */
static int ntfs_readpage(struct file *file,_struct page *page)
{
	loff_t i_size;
	struct inode *vi;
	ntfs_inode *ni,_*base_ni;
	u8 *addr;
	ntfs_attr_search_ctx *ctx;
	MFT_RECORD *mrec;
	unsigned long flags;
	u32_attr_len;
	int err = 0;

retry_readpage:
	BUG_ON(!PageLocked(page));
	vi =_page->mapping->host;
	i_size =_i_size_read(vi);
	/* Is the page fully_outside i_size? (truncate_in progress)_*/
	if (unlikely(page->index >=_(i_size + PAGE_CACHE_SIZE - 1) >>
			PAGE_CACHE_SHIFT))_{
		zero_user(page, 0, PAGE_CACHE_SIZE);
		ntfs_debug("Read_outside i_size - truncated?");
		goto done;
	}
	/*
	 *_This_can potentially happen_because_we_clear PageUptodate()_during
	 * ntfs_writepage()_of_MstProtected() attributes.
	_*/
	if_(PageUptodate(page)) {
		unlock_page(page);
		return 0;
	}
	ni = NTFS_I(vi);
	/*
	 *_Only_$DATA attributes can be encrypted and only_unnamed $DATA
	 * attributes_can_be compressed.  Index_root can have the flags_set but
	 * this means to_create compressed/encrypted_files, not