/*
* Find the given page, and call find_dirent() in order to try to
* return the next entry.
*/
static inline
int find_dirent_page(nfs_readdir_descriptor_t *desc)
{
struct inode *inode = desc->file->f_dentry->d_inode;
struct page *page;
int status;
dfprintk(VFS, "NFS: find_dirent_page() searching directory page %ld\n", desc->page_index);
desc->plus = NFS_USE_READDIRPLUS(inode);
page = read_cache_page(&inode->i_data, desc->page_index,
(filler_t *)nfs_readdir_filler, desc);
if (IS_ERR(page)) {
status = PTR_ERR(page);
goto out;
}
if (!Page_Uptodate(page))
goto read_error;
/* NOTE: Someone else may have changed the READDIRPLUS flag */
desc->page = page;
desc->ptr = kmap(page);
status = find_dirent(desc, page);
if (status < 0)
dir_page_release(desc);
out:
dfprintk(VFS, "NFS: find_dirent_page() returns %d\n", status);
return status;
read_error:
page_cache_release(page);
return -EIO;
}
/**
* vxfs_get_page - read a page into memory.
* @ip: inode to read from
* @n: page number
*
* Description:
* vxfs_get_page reads the @n th page of @ip into the pagecache.
*
* Returns:
* The wanted page on success, else a NULL pointer.
*/
struct page *
vxfs_get_page(struct address_space *mapping, u_long n)
{
struct page * pp;
pp = read_cache_page(mapping, n,
(filler_t*)mapping->a_ops->readpage, NULL);
if (!IS_ERR(pp)) {
wait_on_page(pp);
kmap(pp);
if (!Page_Uptodate(pp))
goto fail;
/** if (!PageChecked(pp)) **/
/** vxfs_check_page(pp); **/
if (PageError(pp))
goto fail;
}
return (pp);
fail:
vxfs_put_page(pp);
return ERR_PTR(-EIO);
}
static int yaffs_prepare_write(struct file *f, struct page *pg,
unsigned offset, unsigned to)
{
T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_prepair_write\n"));
if (!Page_Uptodate(pg) && (offset || to < PAGE_CACHE_SIZE))
return yaffs_readpage_nolock(f, pg);
return 0;
}
static int ramdisk_prepare_write(struct file *file, struct page *page, unsigned offset, unsigned to)
{
if (!Page_Uptodate(page)) {
void *addr = page_address(page);
memset(addr, 0, PAGE_CACHE_SIZE);
flush_dcache_page(page);
SetPageUptodate(page);
}
SetPageDirty(page);
return 0;
}
/*
* Copyright (C) 2000 Linus Torvalds.
* 2000 Transmeta Corp.
* aops copied from ramfs.
*/
static int ramdisk_readpage(struct file *file, struct page * page)
{
if (!Page_Uptodate(page)) {
memset(kmap(page), 0, PAGE_CACHE_SIZE);
kunmap(page);
flush_dcache_page(page);
SetPageUptodate(page);
}
UnlockPage(page);
return 0;
}
/* read a range of the data via the page cache */
static int blkmtd_read(struct mtd_info *mtd, loff_t from, size_t len,
size_t *retlen, u_char *buf)
{
mtd_raw_dev_data_t *rawdevice = mtd->priv;
int err = 0;
int offset;
int pagenr, pages;
*retlen = 0;
DEBUG(2, "blkmtd: read: dev = `%s' from = %ld len = %d buf = %p\n",
bdevname(rawdevice->binding->bd_dev), (long int)from, len, buf);
pagenr = from >> PAGE_SHIFT;
offset = from - (pagenr << PAGE_SHIFT);
pages = (offset+len+PAGE_SIZE-1) >> PAGE_SHIFT;
DEBUG(3, "blkmtd: read: pagenr = %d offset = %d, pages = %d\n", pagenr, offset, pages);
/* just loop through each page, getting it via readpage() - slow but easy */
while(pages) {
struct page *page;
int cpylen;
DEBUG(3, "blkmtd: read: looking for page: %d\n", pagenr);
page = read_cache_page(&rawdevice->as, pagenr, (filler_t *)blkmtd_readpage, rawdevice->file);
if(IS_ERR(page)) {
return PTR_ERR(page);
}
wait_on_page(page);
if(!Page_Uptodate(page)) {
/* error reading page */
printk("blkmtd: read: page not uptodate\n");
page_cache_release(page);
return -EIO;
}
cpylen = (PAGE_SIZE > len) ? len : PAGE_SIZE;
if(offset+cpylen > PAGE_SIZE)
cpylen = PAGE_SIZE-offset;
memcpy(buf + *retlen, page_address(page) + offset, cpylen);
offset = 0;
len -= cpylen;
*retlen += cpylen;
pagenr++;
pages--;
page_cache_release(page);
}
DEBUG(2, "blkmtd: end read: retlen = %d, err = %d\n", *retlen, err);
return err;
}
static struct page * dir_get_page(struct inode *dir, unsigned long n)
{
struct address_space *mapping = dir->i_mapping;
struct page *page = read_cache_page(mapping, n,
(filler_t*)mapping->a_ops->readpage, NULL);
if (!IS_ERR(page)) {
wait_on_page(page);
kmap(page);
if (!Page_Uptodate(page))
goto fail;
}
return page;
fail:
dir_put_page(page);
return ERR_PTR(-EIO);
}
int j4fs_prepare_write(struct file *f, struct page *pg,
unsigned offset, unsigned to)
{
if(j4fs_panic==1) {
J4FS_T(J4FS_TRACE_ALWAYS,("%s %d: j4fs panic\n",__FUNCTION__,__LINE__));
return -ENOSPC;
}
J4FS_T(J4FS_TRACE_FS, ("\nj4fs_prepare_write\n"));
if(to>PAGE_CACHE_SIZE) {
J4FS_T(J4FS_TRACE_ALWAYS,("%s %d: page size overflow(offset,to)=(%d,%d)\n",__FUNCTION__,__LINE__,offset,to));
j4fs_panic("page size overflow");
return -ENOSPC;
}
if (!Page_Uptodate(pg) && (offset || to < PAGE_CACHE_SIZE))
return j4fs_readpage_nolock(f, pg);
return 0;
}
int j4fs_write_begin(struct file *filp, struct address_space *mapping,
loff_t pos, unsigned len, unsigned flags,
struct page **pagep, void **fsdata)
{
struct page *pg = NULL;
pgoff_t index = pos >> PAGE_CACHE_SHIFT;
uint32_t offset = pos & (PAGE_CACHE_SIZE - 1);
uint32_t to = offset + len;
int ret = 0;
int space_held = 0;
if(j4fs_panic==1) {
J4FS_T(J4FS_TRACE_ALWAYS,("%s %d: j4fs panic\n",__FUNCTION__,__LINE__));
return -ENOSPC;
}
J4FS_T(J4FS_TRACE_FS, ("start j4fs_write_begin\n"));
if(to>PAGE_CACHE_SIZE) {
J4FS_T(J4FS_TRACE_ALWAYS,("%s %d: page size overflow(pos,index,offset,len,to)=(%d,%d,%d,%d,%d)\n",__FUNCTION__,__LINE__,pos,index,offset,len,to));
j4fs_panic("page size overflow");
return -ENOSPC;
}
/* Get a page */
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 28)
pg = grab_cache_page_write_begin(mapping, index, flags);
#else
pg = __grab_cache_page(mapping, index);
#endif
*pagep = pg;
if (!pg) {
ret = -ENOMEM;
goto out;
}
/* Get fs space */
space_held = j4fs_hold_space(PAGE_CACHE_SIZE);
if (!space_held) {
ret = -ENOSPC;
goto out;
}
/* Update page if required */
if (!Page_Uptodate(pg) && (offset || to < PAGE_CACHE_SIZE))
ret = j4fs_readpage_nolock(filp, pg);
if (ret)
goto out;
/* Happy path return */
J4FS_T(J4FS_TRACE_FS, ("end j4fs_write_begin - ok\n"));
return 0;
out:
J4FS_T(J4FS_TRACE_FS, ("end j4fs_write_begin fail returning %d\n", ret));
if (pg) {
unlock_page(pg);
page_cache_release(pg);
}
return ret;
}
int jffs2_prepare_write (struct file *filp, struct page *pg, unsigned start, unsigned end)
{
struct inode *inode = pg->mapping->host;
struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
__u32 pageofs = pg->index << PAGE_CACHE_SHIFT;
int ret = 0;
D1(printk(KERN_DEBUG "jffs2_prepare_write() nrpages %ld\n", inode->i_mapping->nrpages));
if (pageofs > inode->i_size) {
/* Make new hole frag from old EOF to new page */
struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
struct jffs2_raw_inode ri;
struct jffs2_full_dnode *fn;
__u32 phys_ofs, alloc_len;
D1(printk(KERN_DEBUG "Writing new hole frag 0x%x-0x%x between current EOF and new page\n",
(unsigned int)inode->i_size, pageofs));
ret = jffs2_reserve_space(c, sizeof(ri), &phys_ofs, &alloc_len, ALLOC_NORMAL);
if (ret)
return ret;
down(&f->sem);
memset(&ri, 0, sizeof(ri));
ri.magic = JFFS2_MAGIC_BITMASK;
ri.nodetype = JFFS2_NODETYPE_INODE;
ri.totlen = sizeof(ri);
ri.hdr_crc = crc32(0, &ri, sizeof(struct jffs2_unknown_node)-4);
ri.ino = f->inocache->ino;
ri.version = ++f->highest_version;
ri.mode = inode->i_mode;
ri.uid = inode->i_uid;
ri.gid = inode->i_gid;
ri.isize = max((__u32)inode->i_size, pageofs);
ri.atime = ri.ctime = ri.mtime = CURRENT_TIME;
ri.offset = inode->i_size;
ri.dsize = pageofs - inode->i_size;
ri.csize = 0;
ri.compr = JFFS2_COMPR_ZERO;
ri.node_crc = crc32(0, &ri, sizeof(ri)-8);
ri.data_crc = 0;
fn = jffs2_write_dnode(inode, &ri, NULL, 0, phys_ofs, NULL);
jffs2_complete_reservation(c);
if (IS_ERR(fn)) {
ret = PTR_ERR(fn);
up(&f->sem);
return ret;
}
ret = jffs2_add_full_dnode_to_inode(c, f, fn);
if (f->metadata) {
jffs2_mark_node_obsolete(c, f->metadata->raw);
jffs2_free_full_dnode(f->metadata);
f->metadata = NULL;
}
if (ret) {
D1(printk(KERN_DEBUG "Eep. add_full_dnode_to_inode() failed in prepare_write, returned %d\n", ret));
jffs2_mark_node_obsolete(c, fn->raw);
jffs2_free_full_dnode(fn);
up(&f->sem);
return ret;
}
inode->i_size = pageofs;
up(&f->sem);
}
/* Read in the page if it wasn't already present, unless it's a whole page */
if (!Page_Uptodate(pg) && (start || end < PAGE_CACHE_SIZE)) {
down(&f->sem);
ret = jffs2_do_readpage_nolock(inode, pg);
up(&f->sem);
}
D1(printk(KERN_DEBUG "end prepare_write(). pg->flags %lx\n", pg->flags));
return ret;
}
/* path points to first direct item of the file regarless of how many of
them are there */
int direct2indirect (struct reiserfs_transaction_handle *th, struct inode * inode,
struct path * path, struct buffer_head * unbh,
loff_t tail_offset)
{
struct super_block * sb = inode->i_sb;
struct buffer_head *up_to_date_bh ;
struct item_head * p_le_ih = PATH_PITEM_HEAD (path);
unsigned long total_tail = 0 ;
struct cpu_key end_key; /* Key to search for the last byte of the
converted item. */
struct item_head ind_ih; /* new indirect item to be inserted or
key of unfm pointer to be pasted */
int n_blk_size,
n_retval; /* returned value for reiserfs_insert_item and clones */
struct unfm_nodeinfo unfm_ptr; /* Handle on an unformatted node
that will be inserted in the
tree. */
sb->u.reiserfs_sb.s_direct2indirect ++;
n_blk_size = sb->s_blocksize;
/* and key to search for append or insert pointer to the new
unformatted node. */
copy_item_head (&ind_ih, p_le_ih);
set_le_ih_k_offset (&ind_ih, tail_offset);
set_le_ih_k_type (&ind_ih, TYPE_INDIRECT);
/* Set the key to search for the place for new unfm pointer */
make_cpu_key (&end_key, inode, tail_offset, TYPE_INDIRECT, 4);
// FIXME: we could avoid this
if ( search_for_position_by_key (sb, &end_key, path) == POSITION_FOUND ) {
reiserfs_warning ("PAP-14030: direct2indirect: "
"pasted or inserted byte exists in the tree %K. "
"Use fsck to repair.\n", &end_key);
pathrelse(path);
return -EIO;
}
p_le_ih = PATH_PITEM_HEAD (path);
unfm_ptr.unfm_nodenum = cpu_to_le32 (unbh->b_blocknr);
unfm_ptr.unfm_freespace = 0; // ???
if ( is_statdata_le_ih (p_le_ih) ) {
/* Insert new indirect item. */
set_ih_free_space (&ind_ih, 0); /* delete at nearest future */
put_ih_item_len( &ind_ih, UNFM_P_SIZE );
PATH_LAST_POSITION (path)++;
n_retval = reiserfs_insert_item (th, path, &end_key, &ind_ih,
(char *)&unfm_ptr);
} else {
/* Paste into last indirect item of an object. */
n_retval = reiserfs_paste_into_item(th, path, &end_key,
(char *)&unfm_ptr, UNFM_P_SIZE);
}
if ( n_retval ) {
return n_retval;
}
// note: from here there are two keys which have matching first
// three key components. They only differ by the fourth one.
/* Set the key to search for the direct items of the file */
make_cpu_key (&end_key, inode, max_reiserfs_offset (inode), TYPE_DIRECT, 4);
/* Move bytes from the direct items to the new unformatted node
and delete them. */
while (1) {
int tail_size;
/* end_key.k_offset is set so, that we will always have found
last item of the file */
if ( search_for_position_by_key (sb, &end_key, path) == POSITION_FOUND )
reiserfs_panic (sb, "PAP-14050: direct2indirect: "
"direct item (%K) not found", &end_key);
p_le_ih = PATH_PITEM_HEAD (path);
RFALSE( !is_direct_le_ih (p_le_ih),
"vs-14055: direct item expected(%K), found %h",
&end_key, p_le_ih);
tail_size = (le_ih_k_offset (p_le_ih) & (n_blk_size - 1))
+ ih_item_len(p_le_ih) - 1;
/* we only send the unbh pointer if the buffer is not up to date.
** this avoids overwriting good data from writepage() with old data
** from the disk or buffer cache
** Special case: unbh->b_page will be NULL if we are coming through
** DIRECT_IO handler here.
*/
if ( !unbh->b_page || buffer_uptodate(unbh) || Page_Uptodate(unbh->b_page)) {
up_to_date_bh = NULL ;
} else {
up_to_date_bh = unbh ;
}
n_retval = reiserfs_delete_item (th, path, &end_key, inode,
up_to_date_bh) ;
total_tail += n_retval ;
if (tail_size == n_retval)
// done: file does not have direct items anymore
break;
}
/* if we've copied bytes from disk into the page, we need to zero
** out the unused part of the block (it was not up to date before)
** the page is still kmapped (by whoever called reiserfs_get_block)
*/
if (up_to_date_bh) {
unsigned pgoff = (tail_offset + total_tail - 1) & (PAGE_CACHE_SIZE - 1);
memset(page_address(unbh->b_page) + pgoff, 0, n_blk_size - total_tail) ;
}
inode->u.reiserfs_i.i_first_direct_byte = U32_MAX;
reiserfs_update_tail_transaction(inode);
return 0;
}
//int jffs2_prepare_write (struct file *filp, struct page *pg, unsigned start, unsigned end)
int jffs2_prepare_write (struct inode *d_inode, struct page *pg, unsigned start, unsigned end)
{
struct inode *inode = d_inode;
struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
uint32_t pageofs = pg->index << PAGE_CACHE_SHIFT;
int ret = 0;
D1(printk(KERN_DEBUG "jffs2_prepare_write()\n"));
if (pageofs > inode->i_size) {
/* Make new hole frag from old EOF to new page */
struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
struct jffs2_raw_inode ri;
struct jffs2_full_dnode *fn;
uint32_t phys_ofs, alloc_len;
D1(printk(KERN_DEBUG "Writing new hole frag 0x%x-0x%x between current EOF and new page\n",
(unsigned int)inode->i_size, pageofs));
ret = jffs2_reserve_space(c, sizeof(ri), &phys_ofs, &alloc_len, ALLOC_NORMAL);
if (ret)
return ret;
down(&f->sem);
memset(&ri, 0, sizeof(ri));
ri.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
ri.nodetype = cpu_to_je16(JFFS2_NODETYPE_INODE);
ri.totlen = cpu_to_je32(sizeof(ri));
ri.hdr_crc = cpu_to_je32(crc32(0, &ri, sizeof(struct jffs2_unknown_node)-4));
ri.ino = cpu_to_je32(f->inocache->ino);
ri.version = cpu_to_je32(++f->highest_version);
ri.mode = cpu_to_jemode(inode->i_mode);
ri.uid = cpu_to_je16(inode->i_uid);
ri.gid = cpu_to_je16(inode->i_gid);
ri.isize = cpu_to_je32(max((uint32_t)inode->i_size, pageofs));
ri.atime = ri.ctime = ri.mtime = cpu_to_je32(cyg_timestamp());
ri.offset = cpu_to_je32(inode->i_size);
ri.dsize = cpu_to_je32(pageofs - inode->i_size);
ri.csize = cpu_to_je32(0);
ri.compr = JFFS2_COMPR_ZERO;
ri.node_crc = cpu_to_je32(crc32(0, &ri, sizeof(ri)-8));
ri.data_crc = cpu_to_je32(0);
fn = jffs2_write_dnode(c, f, &ri, NULL, 0, phys_ofs, NULL);
jffs2_complete_reservation(c);
if (IS_ERR(fn)) {
ret = PTR_ERR(fn);
up(&f->sem);
return ret;
}
ret = jffs2_add_full_dnode_to_inode(c, f, fn);
if (f->metadata) {
jffs2_mark_node_obsolete(c, f->metadata->raw);
jffs2_free_full_dnode(f->metadata);
f->metadata = NULL;
}
if (ret) {
D1(printk(KERN_DEBUG "Eep. add_full_dnode_to_inode() failed in prepare_write, returned %d\n", ret));
jffs2_mark_node_obsolete(c, fn->raw);
jffs2_free_full_dnode(fn);
up(&f->sem);
return ret;
}
inode->i_size = pageofs;
up(&f->sem);
}
/* Read in the page if it wasn't already present, unless it's a whole page */
// eCos has no concept of uptodate and by default always reads pages afresh
if (!Page_Uptodate(pg) && (start || end < PAGE_CACHE_SIZE)) {
down(&f->sem);
ret = jffs2_do_readpage_nolock(inode, pg);
up(&f->sem);
}
D1(printk(KERN_DEBUG "end prepare_write()\n"));
return ret;
}
/*
* Returns a pointer to a buffer containing at least LEN bytes of
* filesystem starting at byte offset OFFSET into the filesystem.
*/
static void *cramfs_read(struct super_block *sb, unsigned int offset, unsigned int len)
{
struct address_space *mapping = sb->s_bdev->bd_inode->i_mapping;
struct page *pages[BLKS_PER_BUF];
unsigned i, blocknr, buffer, unread;
unsigned long devsize;
int major, minor;
char *data;
if (!len)
return NULL;
blocknr = offset >> PAGE_CACHE_SHIFT;
offset &= PAGE_CACHE_SIZE - 1;
/* Check if an existing buffer already has the data.. */
for (i = 0; i < READ_BUFFERS; i++) {
unsigned int blk_offset;
if (buffer_dev[i] != sb)
continue;
if (blocknr < buffer_blocknr[i])
continue;
blk_offset = (blocknr - buffer_blocknr[i]) << PAGE_CACHE_SHIFT;
blk_offset += offset;
if (blk_offset + len > BUFFER_SIZE)
continue;
return read_buffers[i] + blk_offset;
}
devsize = mapping->host->i_size >> PAGE_CACHE_SHIFT;
major = MAJOR(sb->s_dev);
minor = MINOR(sb->s_dev);
if (blk_size[major])
devsize = blk_size[major][minor] >> 2;
/* Ok, read in BLKS_PER_BUF pages completely first. */
unread = 0;
for (i = 0; i < BLKS_PER_BUF; i++) {
struct page *page = NULL;
if (blocknr + i < devsize) {
page = read_cache_page(mapping, blocknr + i,
(filler_t *)mapping->a_ops->readpage,
NULL);
/* synchronous error? */
if (IS_ERR(page))
page = NULL;
}
pages[i] = page;
}
for (i = 0; i < BLKS_PER_BUF; i++) {
struct page *page = pages[i];
if (page) {
wait_on_page(page);
if (!Page_Uptodate(page)) {
/* asynchronous error */
page_cache_release(page);
pages[i] = NULL;
}
}
}
buffer = next_buffer;
next_buffer = NEXT_BUFFER(buffer);
buffer_blocknr[buffer] = blocknr;
buffer_dev[buffer] = sb;
data = read_buffers[buffer];
for (i = 0; i < BLKS_PER_BUF; i++) {
struct page *page = pages[i];
if (page) {
memcpy(data, kmap(page), PAGE_CACHE_SIZE);
kunmap(page);
page_cache_release(page);
} else
memset(data, 0, PAGE_CACHE_SIZE);
data += PAGE_CACHE_SIZE;
}
return read_buffers[buffer] + offset;
}
static int rd_blkdev_pagecache_IO(int rw, struct buffer_head * sbh, int minor)
{
struct address_space * mapping;
unsigned long index;
int offset, size, err;
err = -EIO;
err = 0;
mapping = rd_bdev[minor]->bd_inode->i_mapping;
index = sbh->b_rsector >> (PAGE_CACHE_SHIFT - 9);
offset = (sbh->b_rsector << 9) & ~PAGE_CACHE_MASK;
size = sbh->b_size;
do {
int count;
struct page ** hash;
struct page * page;
char * src, * dst;
int unlock = 0;
count = PAGE_CACHE_SIZE - offset;
if (count > size)
count = size;
size -= count;
hash = page_hash(mapping, index);
page = __find_get_page(mapping, index, hash);
if (!page) {
page = grab_cache_page(mapping, index);
err = -ENOMEM;
if (!page)
goto out;
err = 0;
if (!Page_Uptodate(page)) {
memset(kmap(page), 0, PAGE_CACHE_SIZE);
kunmap(page);
SetPageUptodate(page);
}
unlock = 1;
}
index++;
if (rw == READ) {
src = kmap(page);
src += offset;
dst = bh_kmap(sbh);
} else {
dst = kmap(page);
dst += offset;
src = bh_kmap(sbh);
}
offset = 0;
memcpy(dst, src, count);
kunmap(page);
bh_kunmap(sbh);
if (rw == READ) {
flush_dcache_page(page);
} else {
SetPageDirty(page);
}
if (unlock)
UnlockPage(page);
__free_page(page);
} while (size);
out:
return err;
}
/* readpage() - reads one page from the block device */
static int blkmtd_readpage(struct file *file, struct page *page)
{
int err;
int sectornr, sectors, i;
struct kiobuf *iobuf;
mtd_raw_dev_data_t *rawdevice = (mtd_raw_dev_data_t *)file->private_data;
kdev_t dev;
if(!rawdevice) {
printk("blkmtd: readpage: PANIC file->private_data == NULL\n");
return -EIO;
}
dev = to_kdev_t(rawdevice->binding->bd_dev);
DEBUG(2, "blkmtd: readpage called, dev = `%s' page = %p index = %ld\n",
bdevname(dev), page, page->index);
if(Page_Uptodate(page)) {
DEBUG(1, "blkmtd: readpage page %ld is already upto date\n", page->index);
UnlockPage(page);
return 0;
}
ClearPageUptodate(page);
ClearPageError(page);
/* see if page is in the outgoing write queue */
spin_lock(&mbd_writeq_lock);
if(write_queue_cnt) {
int i = write_queue_tail;
while(i != write_queue_head) {
mtdblkdev_write_queue_t *item = &write_queue[i];
if(page->index >= item->pagenr && page->index < item->pagenr+item->pagecnt) {
/* yes it is */
int index = item->pagenr - page->index;
DEBUG(1, "blkmtd: readpage: found page %ld in outgoing write queue\n",
page->index);
if(item->iserase) {
memset(page_address(page), 0xff, PAGE_SIZE);
} else {
memcpy(page_address(page), page_address(item->pages[index]), PAGE_SIZE);
}
SetPageUptodate(page);
flush_dcache_page(page);
UnlockPage(page);
spin_unlock(&mbd_writeq_lock);
return 0;
}
i++;
i %= WRITE_QUEUE_SZ;
}
}
spin_unlock(&mbd_writeq_lock);
DEBUG(3, "blkmtd: readpage: getting kiovec\n");
err = alloc_kiovec(1, &iobuf);
if (err) {
return err;
}
iobuf->offset = 0;
iobuf->nr_pages = 1;
iobuf->length = PAGE_SIZE;
iobuf->locked = 1;
iobuf->maplist[0] = page;
sectornr = page->index << (PAGE_SHIFT - rawdevice->sector_bits);
sectors = 1 << (PAGE_SHIFT - rawdevice->sector_bits);
DEBUG(3, "blkmtd: readpage: sectornr = %d sectors = %d\n", sectornr, sectors);
for(i = 0; i < sectors; i++) {
iobuf->blocks[i] = sectornr++;
}
DEBUG(3, "bklmtd: readpage: starting brw_kiovec\n");
err = brw_kiovec(READ, 1, &iobuf, dev, iobuf->blocks, rawdevice->sector_size);
DEBUG(3, "blkmtd: readpage: finished, err = %d\n", err);
iobuf->locked = 0;
free_kiovec(1, &iobuf);
if(err != PAGE_SIZE) {
printk("blkmtd: readpage: error reading page %ld\n", page->index);
memset(page_address(page), 0, PAGE_SIZE);
SetPageError(page);
err = -EIO;
} else {
DEBUG(3, "blkmtd: readpage: setting page upto date\n");
SetPageUptodate(page);
err = 0;
}
flush_dcache_page(page);
UnlockPage(page);
DEBUG(2, "blkmtd: readpage: finished, err = %d\n", err);
return 0;
}
struct dentry *umsdos_solve_hlink (struct dentry *hlink)
{
/* root is our root for resolving pseudo-hardlink */
struct dentry *base = hlink->d_sb->s_root;
struct dentry *dentry_dst;
char *path, *pt;
int len;
struct address_space *mapping = hlink->d_inode->i_mapping;
struct page *page;
page=read_cache_page(mapping,0,(filler_t *)mapping->a_ops->readpage,NULL);
dentry_dst=(struct dentry *)page;
if (IS_ERR(page))
goto out;
wait_on_page(page);
if (!Page_Uptodate(page))
goto async_fail;
dentry_dst = ERR_PTR(-ENOMEM);
path = (char *) kmalloc (PATH_MAX, GFP_KERNEL);
if (path == NULL)
goto out_release;
memcpy(path, kmap(page), hlink->d_inode->i_size);
kunmap(page);
page_cache_release(page);
len = hlink->d_inode->i_size;
/* start at root dentry */
dentry_dst = dget(base);
path[len] = '\0';
pt = path;
if (*path == '/')
pt++; /* skip leading '/' */
if (base->d_inode == pseudo_root)
pt += (UMSDOS_PSDROOT_LEN + 1);
while (1) {
struct dentry *dir = dentry_dst, *demd;
char *start = pt;
int real;
while (*pt != '\0' && *pt != '/') pt++;
len = (int) (pt - start);
if (*pt == '/') *pt++ = '\0';
real = 1;
demd = umsdos_get_emd_dentry(dir);
if (!IS_ERR(demd)) {
if (demd->d_inode)
real = 0;
dput(demd);
}
#ifdef UMSDOS_DEBUG_VERBOSE
printk ("umsdos_solve_hlink: dir %s/%s, name=%s, real=%d\n",
dir->d_parent->d_name.name, dir->d_name.name, start, real);
#endif
dentry_dst = umsdos_lookup_dentry(dir, start, len, real);
/* XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX */
if (real)
d_drop(dir);
dput (dir);
if (IS_ERR(dentry_dst))
break;
/* not found? stop search ... */
if (!dentry_dst->d_inode) {
break;
}
if (*pt == '\0') /* we're finished! */
break;
} /* end while */
if (!IS_ERR(dentry_dst)) {
struct inode *inode = dentry_dst->d_inode;
if (inode) {
inode->u.umsdos_i.i_is_hlink = 1;
#ifdef UMSDOS_DEBUG_VERBOSE
printk ("umsdos_solve_hlink: resolved link %s/%s, ino=%ld\n",
dentry_dst->d_parent->d_name.name, dentry_dst->d_name.name, inode->i_ino);
#endif
} else {
#ifdef UMSDOS_DEBUG_VERBOSE
printk ("umsdos_solve_hlink: resolved link %s/%s negative!\n",
dentry_dst->d_parent->d_name.name, dentry_dst->d_name.name);
#endif
}
} else
printk(KERN_WARNING
"umsdos_solve_hlink: err=%ld\n", PTR_ERR(dentry_dst));
kfree (path);
out:
dput(hlink); /* original hlink no longer needed */
return dentry_dst;
async_fail:
dentry_dst = ERR_PTR(-EIO);
out_release:
page_cache_release(page);
goto out;
}