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yaffs_vfs_multi.c
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/*
* YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
*
* Copyright (C) 2002-2018 Aleph One Ltd.
*
* Created by Charles Manning <[email protected]>
* Acknowledgements:
* Luc van OostenRyck for numerous patches.
* Nick Bane for numerous patches.
* Nick Bane for 2.5/2.6 integration.
* Andras Toth for mknod rdev issue.
* Michael Fischer for finding the problem with inode inconsistency.
* Some code bodily lifted from JFFS
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
/*
*
* This is the file system front-end to YAFFS that hooks it up to
* the VFS.
*
* Special notes:
* >> 2.4: sb->u.generic_sbp points to the struct yaffs_dev associated with
* this superblock
* >> 2.6: sb->s_fs_info points to the struct yaffs_dev associated with this
* superblock
* >> inode->u.generic_ip points to the associated struct yaffs_obj.
*/
/*
* There are two variants of the VFS glue code. This variant should compile
* for any version of Linux.
*/
#include <linux/version.h>
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 10))
#define YAFFS_COMPILE_BACKGROUND
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23))
#define YAFFS_COMPILE_FREEZER
#endif
#endif
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 28))
#define YAFFS_COMPILE_EXPORTFS
#endif
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 35))
#define YAFFS_USE_SETATTR_COPY
#define YAFFS_USE_TRUNCATE_SETSIZE
#endif
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 35))
#define YAFFS_HAS_EVICT_INODE
#endif
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 13)) && \
(LINUX_VERSION_CODE < KERNEL_VERSION(4, 8, 0))
#define YAFFS_NEW_FOLLOW_LINK 1
#else
#define YAFFS_NEW_FOLLOW_LINK 0
#endif
#if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 6, 0))
#define YAFFS_HAS_WRITE_SUPER
#endif
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19))
#include <linux/config.h>
#endif
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/fs.h>
#include <linux/proc_fs.h>
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 39))
#include <linux/smp_lock.h>
#endif
#include <linux/pagemap.h>
#include <linux/mtd/mtd.h>
#include <linux/interrupt.h>
#include <linux/string.h>
#include <linux/ctype.h>
#if (YAFFS_NEW_FOLLOW_LINK == 1)
#include <linux/namei.h>
#endif
#ifdef YAFFS_COMPILE_EXPORTFS
#include <linux/exportfs.h>
#endif
#ifdef YAFFS_COMPILE_BACKGROUND
#include <linux/kthread.h>
#include <linux/delay.h>
#endif
#ifdef YAFFS_COMPILE_FREEZER
#include <linux/freezer.h>
#endif
#include <asm/div64.h>
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
#include <linux/statfs.h>
#define UnlockPage(p) unlock_page(p)
#define Page_Uptodate(page) test_bit(PG_uptodate, &(page)->flags)
/* FIXME: use sb->s_id instead ? */
#define yaffs_devname(sb, buf) bdevname(sb->s_bdev, buf)
#else
#include <linux/locks.h>
#define BDEVNAME_SIZE 0
#define yaffs_devname(sb, buf) kdevname(sb->s_dev)
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 5, 0))
/* added NCB 26/5/2006 for 2.4.25-vrs2-tcl1 kernel */
#define __user
#endif
#endif
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 26))
#define YPROC_ROOT (&proc_root)
#else
#define YPROC_ROOT NULL
#endif
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 26))
#define Y_INIT_TIMER(a) init_timer(a)
#else
#define Y_INIT_TIMER(a) init_timer_on_stack(a)
#endif
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 27))
#define YAFFS_USE_WRITE_BEGIN_END 1
#else
#define YAFFS_USE_WRITE_BEGIN_END 0
#endif
#if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 6, 0))
#define YAFFS_SUPER_HAS_DIRTY
#endif
#if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 2, 0))
#define set_nlink(inode, count) do { (inode)->i_nlink = (count); } while(0)
#endif
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 28))
static uint32_t YCALCBLOCKS(uint64_t partition_size, uint32_t block_size)
{
uint64_t result = partition_size;
do_div(result, block_size);
return (uint32_t) result;
}
#else
#define YCALCBLOCKS(s, b) ((s)/(b))
#endif
#include <linux/uaccess.h>
#include <linux/mtd/mtd.h>
#include "yportenv.h"
#include "yaffs_trace.h"
#include "yaffs_guts.h"
#include "yaffs_attribs.h"
#include "yaffs_linux.h"
#include "yaffs_mtdif.h"
#include "yaffs_packedtags2.h"
#include "yaffs_getblockinfo.h"
unsigned int yaffs_trace_mask =
YAFFS_TRACE_BAD_BLOCKS |
YAFFS_TRACE_ALWAYS |
0;
unsigned int yaffs_wr_attempts = YAFFS_WR_ATTEMPTS;
unsigned int yaffs_auto_checkpoint = 1;
unsigned int yaffs_gc_control = 1;
unsigned int yaffs_bg_enable = 1;
unsigned int yaffs_auto_select = 1;
/* Module Parameters */
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
module_param(yaffs_trace_mask, uint, 0644);
module_param(yaffs_wr_attempts, uint, 0644);
module_param(yaffs_auto_checkpoint, uint, 0644);
module_param(yaffs_gc_control, uint, 0644);
module_param(yaffs_bg_enable, uint, 0644);
#else
MODULE_PARM(yaffs_trace_mask, "i");
MODULE_PARM(yaffs_wr_attempts, "i");
MODULE_PARM(yaffs_auto_checkpoint, "i");
MODULE_PARM(yaffs_gc_control, "i");
#endif
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 25))
/* use iget and read_inode */
#define Y_IGET(sb, inum) iget((sb), (inum))
#else
/* Call local equivalent */
#define YAFFS_USE_OWN_IGET
#define Y_IGET(sb, inum) yaffs_iget((sb), (inum))
#endif
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 18))
#define yaffs_inode_to_obj_lv(iptr) ((iptr)->i_private)
#else
#define yaffs_inode_to_obj_lv(iptr) ((iptr)->u.generic_ip)
#endif
#define yaffs_inode_to_obj(iptr) \
((struct yaffs_obj *)(yaffs_inode_to_obj_lv(iptr)))
#define yaffs_dentry_to_obj(dptr) yaffs_inode_to_obj((dptr)->d_inode)
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
#define yaffs_super_to_dev(sb) ((struct yaffs_dev *)sb->s_fs_info)
#else
#define yaffs_super_to_dev(sb) ((struct yaffs_dev *)sb->u.generic_sbp)
#endif
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 5, 0))
#define Y_CLEAR_INODE(i) clear_inode(i)
#else
#define Y_CLEAR_INODE(i) end_writeback(i)
#endif
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 12, 0))
#define YAFFS_USE_DIR_ITERATE
#endif
#if (LINUX_VERSION_CODE < KERNEL_VERSION(4, 9, 0))
#define YAFFS_USE_XATTR
#endif
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,12,0))
#define YAFFS_NEW_PROCFS
#include <linux/seq_file.h>
#endif
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4, 8, 0))
#define PAGE_CACHE_SIZE PAGE_SIZE
#define PAGE_CACHE_SHIFT PAGE_SHIFT
#define Y_GET_DENTRY(f) ((f)->f_path.dentry)
#define page_cache_release put_page
#define YAFFS_NEW_XATTR 1
#define YAFFS_NEW_GET_LINK 1
#else
#define Y_GET_DENTRY(f) ((f)->f_dentry)
#define YAFFS_NEW_XATTR 0
#define YAFFS_NEW_GET_LINK 0
#endif
#define update_dir_time(dir) do {\
(dir)->i_ctime = (dir)->i_mtime = CURRENT_TIME; \
} while (0)
#if (LINUX_VERSION_CODE < KERNEL_VERSION(4, 9, 0))
static inline int setattr_prepare(struct dentry *dentry, struct iattr *attr)
{
return inode_change_ok(dentry->d_inode, attr);
}
#endif
static void yaffs_fill_inode_from_obj(struct inode *inode,
struct yaffs_obj *obj);
static void yaffs_gross_lock(struct yaffs_dev *dev)
{
yaffs_trace(YAFFS_TRACE_LOCK, "yaffs locking %p", current);
mutex_lock(&(yaffs_dev_to_lc(dev)->gross_lock));
yaffs_trace(YAFFS_TRACE_LOCK, "yaffs locked %p", current);
}
static void yaffs_gross_unlock(struct yaffs_dev *dev)
{
yaffs_trace(YAFFS_TRACE_LOCK, "yaffs unlocking %p", current);
mutex_unlock(&(yaffs_dev_to_lc(dev)->gross_lock));
}
static int yaffs_readpage_nolock(struct file *f, struct page *pg)
{
/* Lifted from jffs2 */
struct yaffs_obj *obj;
unsigned char *pg_buf;
int ret;
loff_t pos = ((loff_t) pg->index) << PAGE_SHIFT;
struct yaffs_dev *dev;
yaffs_trace(YAFFS_TRACE_OS,
"yaffs_readpage_nolock at %lld, size %08x",
(long long)pos,
(unsigned)PAGE_SIZE);
obj = yaffs_dentry_to_obj(Y_GET_DENTRY(f));
dev = obj->my_dev;
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
BUG_ON(!PageLocked(pg));
#else
if (!PageLocked(pg))
PAGE_BUG(pg);
#endif
pg_buf = kmap(pg);
/* FIXME: Can kmap fail? */
yaffs_gross_lock(dev);
ret = yaffs_file_rd(obj, pg_buf, pos, PAGE_CACHE_SIZE);
yaffs_gross_unlock(dev);
if (ret >= 0)
ret = 0;
if (ret) {
ClearPageUptodate(pg);
SetPageError(pg);
} else {
SetPageUptodate(pg);
ClearPageError(pg);
}
flush_dcache_page(pg);
kunmap(pg);
yaffs_trace(YAFFS_TRACE_OS, "yaffs_readpage_nolock done");
return ret;
}
static int yaffs_readpage_unlock(struct file *f, struct page *pg)
{
int ret = yaffs_readpage_nolock(f, pg);
UnlockPage(pg);
return ret;
}
static int yaffs_readpage(struct file *f, struct page *pg)
{
int ret;
yaffs_trace(YAFFS_TRACE_OS, "yaffs_readpage");
ret = yaffs_readpage_unlock(f, pg);
yaffs_trace(YAFFS_TRACE_OS, "yaffs_readpage done");
return ret;
}
static void yaffs_set_super_dirty_val(struct yaffs_dev *dev, int val)
{
struct yaffs_linux_context *lc = yaffs_dev_to_lc(dev);
if (lc)
lc->dirty = val;
# ifdef YAFFS_SUPER_HAS_DIRTY
{
struct super_block *sb = lc->super;
if (sb)
sb->s_dirt = val;
}
#endif
}
static void yaffs_set_super_dirty(struct yaffs_dev *dev)
{
yaffs_set_super_dirty_val(dev, 1);
}
static void yaffs_clear_super_dirty(struct yaffs_dev *dev)
{
yaffs_set_super_dirty_val(dev, 0);
}
static int yaffs_check_super_dirty(struct yaffs_dev *dev)
{
struct yaffs_linux_context *lc = yaffs_dev_to_lc(dev);
if (lc && lc->dirty)
return 1;
# ifdef YAFFS_SUPER_HAS_DIRTY
{
struct super_block *sb = lc->super;
if (sb && sb->s_dirt)
return 1;
}
#endif
return 0;
}
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
static int yaffs_writepage(struct page *page, struct writeback_control *wbc)
#else
static int yaffs_writepage(struct page *page)
#endif
{
struct yaffs_dev *dev;
struct address_space *mapping = page->mapping;
struct inode *inode;
unsigned long end_index;
char *buffer;
struct yaffs_obj *obj;
int n_written = 0;
unsigned n_bytes;
loff_t i_size;
if (!mapping)
BUG();
inode = mapping->host;
if (!inode)
BUG();
i_size = i_size_read(inode);
end_index = i_size >> PAGE_CACHE_SHIFT;
if (page->index < end_index)
n_bytes = PAGE_CACHE_SIZE;
else {
n_bytes = i_size & (PAGE_CACHE_SIZE - 1);
if (page->index > end_index || !n_bytes) {
yaffs_trace(YAFFS_TRACE_OS,
"yaffs_writepage at %lld, inode size = %lld!!",
((loff_t)page->index) << PAGE_CACHE_SHIFT,
inode->i_size);
yaffs_trace(YAFFS_TRACE_OS,
" -> don't care!!");
zero_user_segment(page, 0, PAGE_CACHE_SIZE);
set_page_writeback(page);
unlock_page(page);
end_page_writeback(page);
return 0;
}
}
if (n_bytes != PAGE_CACHE_SIZE)
zero_user_segment(page, n_bytes, PAGE_CACHE_SIZE);
get_page(page);
buffer = kmap(page);
obj = yaffs_inode_to_obj(inode);
dev = obj->my_dev;
yaffs_gross_lock(dev);
yaffs_trace(YAFFS_TRACE_OS,
"yaffs_writepage at %lld, size %08x",
((loff_t)page->index) << PAGE_CACHE_SHIFT, n_bytes);
yaffs_trace(YAFFS_TRACE_OS,
"writepag0: obj = %lld, ino = %lld",
obj->variant.file_variant.file_size, inode->i_size);
n_written = yaffs_wr_file(obj, buffer,
((loff_t)page->index) << PAGE_CACHE_SHIFT, n_bytes, 0);
yaffs_set_super_dirty(dev);
yaffs_trace(YAFFS_TRACE_OS,
"writepag1: obj = %lld, ino = %lld",
obj->variant.file_variant.file_size, inode->i_size);
yaffs_gross_unlock(dev);
kunmap(page);
set_page_writeback(page);
unlock_page(page);
end_page_writeback(page);
put_page(page);
return (n_written == n_bytes) ? 0 : -ENOSPC;
}
/* Space holding and freeing is done to ensure we have space available for write_begin/end */
/* For now we just assume few parallel writes and check against a small number. */
/* Todo: need to do this with a counter to handle parallel reads better */
static ssize_t yaffs_hold_space(struct file *f)
{
struct yaffs_obj *obj;
struct yaffs_dev *dev;
int n_free_chunks;
obj = yaffs_dentry_to_obj(Y_GET_DENTRY(f));
dev = obj->my_dev;
yaffs_gross_lock(dev);
n_free_chunks = yaffs_get_n_free_chunks(dev);
yaffs_gross_unlock(dev);
return (n_free_chunks > 20) ? 1 : 0;
}
static void yaffs_release_space(struct file *f)
{
struct yaffs_obj *obj;
struct yaffs_dev *dev;
obj = yaffs_dentry_to_obj(Y_GET_DENTRY(f));
dev = obj->my_dev;
yaffs_gross_lock(dev);
yaffs_gross_unlock(dev);
}
#if (YAFFS_USE_WRITE_BEGIN_END > 0)
static int yaffs_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;
int ret = 0;
int space_held = 0;
/* 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;
}
yaffs_trace(YAFFS_TRACE_OS,
"start yaffs_write_begin index %d(%x) uptodate %d",
(int)index, (int)index, Page_Uptodate(pg) ? 1 : 0);
/* Get fs space */
space_held = yaffs_hold_space(filp);
if (!space_held) {
ret = -ENOSPC;
goto out;
}
/* Update page if required */
if (!Page_Uptodate(pg))
ret = yaffs_readpage_nolock(filp, pg);
if (ret)
goto out;
/* Happy path return */
yaffs_trace(YAFFS_TRACE_OS, "end yaffs_write_begin - ok");
return 0;
out:
yaffs_trace(YAFFS_TRACE_OS,
"end yaffs_write_begin fail returning %d", ret);
if (space_held)
yaffs_release_space(filp);
if (pg) {
unlock_page(pg);
page_cache_release(pg);
}
return ret;
}
#else
static int yaffs_prepare_write(struct file *f, struct page *pg,
unsigned offset, unsigned to)
{
yaffs_trace(YAFFS_TRACE_OS, "yaffs_prepair_write");
if (!Page_Uptodate(pg))
return yaffs_readpage_nolock(f, pg);
return 0;
}
#endif
static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
loff_t * pos)
{
struct yaffs_obj *obj;
int n_written;
loff_t ipos;
struct inode *inode;
struct yaffs_dev *dev;
obj = yaffs_dentry_to_obj(Y_GET_DENTRY(f));
if (!obj) {
yaffs_trace(YAFFS_TRACE_OS,
"yaffs_file_write: hey obj is null!");
return -EINVAL;
}
dev = obj->my_dev;
yaffs_gross_lock(dev);
inode = Y_GET_DENTRY(f)->d_inode;
if (!S_ISBLK(inode->i_mode) && f->f_flags & O_APPEND)
ipos = inode->i_size;
else
ipos = *pos;
yaffs_trace(YAFFS_TRACE_OS,
"yaffs_file_write about to write writing %u(%x) bytes to object %d at %lld",
(unsigned)n, (unsigned)n, obj->obj_id, ipos);
n_written = yaffs_wr_file(obj, buf, ipos, n, 0);
yaffs_set_super_dirty(dev);
yaffs_trace(YAFFS_TRACE_OS,
"yaffs_file_write: %d(%x) bytes written",
(unsigned)n, (unsigned)n);
if (n_written > 0) {
ipos += n_written;
*pos = ipos;
if (ipos > inode->i_size) {
inode->i_size = ipos;
inode->i_blocks = (ipos + 511) >> 9;
yaffs_trace(YAFFS_TRACE_OS,
"yaffs_file_write size updated to %lld bytes, %d blocks",
ipos, (int)(inode->i_blocks));
}
}
yaffs_gross_unlock(dev);
return (n_written == 0) && (n > 0) ? -ENOSPC : n_written;
}
#if (YAFFS_USE_WRITE_BEGIN_END > 0)
static int yaffs_write_end(struct file *filp, struct address_space *mapping,
loff_t pos, unsigned len, unsigned copied,
struct page *pg, void *fsdadata)
{
int ret = 0;
void *addr, *kva;
uint32_t offset_into_page = pos & (PAGE_CACHE_SIZE - 1);
kva = kmap(pg);
addr = kva + offset_into_page;
yaffs_trace(YAFFS_TRACE_OS,
"yaffs_write_end addr %p pos %lld n_bytes %d",
addr, pos, copied);
ret = yaffs_file_write(filp, addr, copied, &pos);
if (ret != copied) {
yaffs_trace(YAFFS_TRACE_OS,
"yaffs_write_end not same size ret %d copied %d",
ret, copied);
SetPageError(pg);
}
kunmap(pg);
yaffs_release_space(filp);
unlock_page(pg);
page_cache_release(pg);
return ret;
}
#else
static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset,
unsigned to)
{
void *addr, *kva;
loff_t pos = (((loff_t) pg->index) << PAGE_CACHE_SHIFT) + offset;
int n_bytes = to - offset;
int n_written;
kva = kmap(pg);
addr = kva + offset;
yaffs_trace(YAFFS_TRACE_OS,
"yaffs_commit_write addr %p pos %lld n_bytes %d",
addr, pos, n_bytes);
n_written = yaffs_file_write(f, addr, n_bytes, &pos);
if (n_written != n_bytes) {
yaffs_trace(YAFFS_TRACE_OS,
"yaffs_commit_write not same size n_written %d n_bytes %d",
n_written, n_bytes);
SetPageError(pg);
}
kunmap(pg);
yaffs_trace(YAFFS_TRACE_OS,
"yaffs_commit_write returning %d",
n_written == n_bytes ? 0 : n_written);
return n_written == n_bytes ? 0 : n_written;
}
#endif
static struct address_space_operations yaffs_file_address_operations = {
.readpage = yaffs_readpage,
.writepage = yaffs_writepage,
#if (YAFFS_USE_WRITE_BEGIN_END > 0)
.write_begin = yaffs_write_begin,
.write_end = yaffs_write_end,
#else
.prepare_write = yaffs_prepare_write,
.commit_write = yaffs_commit_write,
#endif
};
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
static int yaffs_file_flush(struct file *file, fl_owner_t id)
#else
static int yaffs_file_flush(struct file *file)
#endif
{
struct yaffs_obj *obj = yaffs_dentry_to_obj(Y_GET_DENTRY(file));
struct yaffs_dev *dev = obj->my_dev;
yaffs_trace(YAFFS_TRACE_OS,
"yaffs_file_flush object %d (%s)",
obj->obj_id,
obj->dirty ? "dirty" : "clean");
yaffs_gross_lock(dev);
yaffs_flush_file(obj, 1, 0, 0);
yaffs_gross_unlock(dev);
return 0;
}
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 39))
static int yaffs_sync_object(struct file *file, loff_t start, loff_t end, int datasync)
#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 34))
static int yaffs_sync_object(struct file *file, int datasync)
#else
static int yaffs_sync_object(struct file *file, struct dentry *dentry,
int datasync)
#endif
{
struct yaffs_obj *obj;
struct yaffs_dev *dev;
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 34))
struct dentry *dentry = file->f_path.dentry;
#endif
obj = yaffs_dentry_to_obj(dentry);
dev = obj->my_dev;
yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC,
"yaffs_sync_object");
yaffs_gross_lock(dev);
yaffs_flush_file(obj, 1, datasync, 0);
yaffs_gross_unlock(dev);
return 0;
}
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 22))
static const struct file_operations yaffs_file_operations = {
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 16, 0)
#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 8, 0)
.read = new_sync_read,
.write = new_sync_write,
#endif
.read_iter = generic_file_read_iter,
.write_iter = generic_file_write_iter,
#else
.read = do_sync_read,
.write = do_sync_write,
.aio_read = generic_file_aio_read,
.aio_write = generic_file_aio_write,
#endif
.mmap = generic_file_mmap,
.flush = yaffs_file_flush,
.fsync = yaffs_sync_object,
.splice_read = generic_file_splice_read,
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 16, 0)
.splice_write = iter_file_splice_write,
#else
.splice_write = generic_file_splice_write,
#endif
.llseek = generic_file_llseek,
};
#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 18))
static const struct file_operations yaffs_file_operations = {
.read = do_sync_read,
.write = do_sync_write,
.aio_read = generic_file_aio_read,
.aio_write = generic_file_aio_write,
.mmap = generic_file_mmap,
.flush = yaffs_file_flush,
.fsync = yaffs_sync_object,
.sendfile = generic_file_sendfile,
};
#else
static const struct file_operations yaffs_file_operations = {
.read = generic_file_read,
.write = generic_file_write,
.mmap = generic_file_mmap,
.flush = yaffs_file_flush,
.fsync = yaffs_sync_object,
#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
.sendfile = generic_file_sendfile,
#endif
};
#endif
#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 25))
static void zero_user_segment(struct page *page, unsigned start, unsigned end)
{
void *kaddr = kmap_atomic(page, KM_USER0);
memset(kaddr + start, 0, end - start);
kunmap_atomic(kaddr, KM_USER0);
flush_dcache_page(page);
}
#endif
static int yaffs_vfs_setsize(struct inode *inode, loff_t newsize)
{
#ifdef YAFFS_USE_TRUNCATE_SETSIZE
truncate_setsize(inode, newsize);
return 0;
#else
truncate_inode_pages(&inode->i_data, newsize);
return 0;
#endif
}
static int yaffs_vfs_setattr(struct inode *inode, struct iattr *attr)
{
#ifdef YAFFS_USE_SETATTR_COPY
setattr_copy(inode, attr);
return 0;
#else
return inode_setattr(inode, attr);
#endif
}
static int yaffs_setattr(struct dentry *dentry, struct iattr *attr)
{
struct inode *inode = dentry->d_inode;
int error = 0;
struct yaffs_dev *dev;
yaffs_trace(YAFFS_TRACE_OS,
"yaffs_setattr of object %d",
yaffs_inode_to_obj(inode)->obj_id);
#if 0
/* Fail if a requested resize >= 2GB */
if (attr->ia_valid & ATTR_SIZE && (attr->ia_size >> 31))
error = -EINVAL;
#endif
if (error == 0)
error = setattr_prepare(dentry, attr);
if (error == 0) {
int result;
if (!error) {
error = yaffs_vfs_setattr(inode, attr);
yaffs_trace(YAFFS_TRACE_OS, "inode_setattr called");
if (attr->ia_valid & ATTR_SIZE) {
yaffs_vfs_setsize(inode, attr->ia_size);
inode->i_blocks = (inode->i_size + 511) >> 9;
}
}
dev = yaffs_inode_to_obj(inode)->my_dev;
if (attr->ia_valid & ATTR_SIZE) {
yaffs_trace(YAFFS_TRACE_OS,
"resize to %d(%x)",
(int)(attr->ia_size),
(int)(attr->ia_size));
}
yaffs_gross_lock(dev);
result = yaffs_set_attribs(yaffs_inode_to_obj(inode), attr);
if (result == YAFFS_OK) {
error = 0;
} else {
error = -EPERM;
}
yaffs_gross_unlock(dev);
}
yaffs_trace(YAFFS_TRACE_OS, "yaffs_setattr done returning %d", error);
return error;
}
#ifdef YAFFS_USE_XATTR
#if (YAFFS_NEW_XATTR > 0)
static int yaffs_setxattr(struct dentry *dentry, struct inode *inode,
const char *name, const void *value, size_t size, int flags)
{
#else
static int yaffs_setxattr(struct dentry *dentry, const char *name,
const void *value, size_t size, int flags)
{
struct inode *inode = dentry->d_inode;
#endif
int error = 0;
struct yaffs_dev *dev;
struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
yaffs_trace(YAFFS_TRACE_OS, "yaffs_setxattr of object %d", obj->obj_id);
if (error == 0) {
int result;
dev = obj->my_dev;
yaffs_gross_lock(dev);
result = yaffs_set_xattrib(obj, name, value, size, flags);
if (result == YAFFS_OK)
error = 0;
else if (result < 0)
error = result;
yaffs_gross_unlock(dev);
}
yaffs_trace(YAFFS_TRACE_OS, "yaffs_setxattr done returning %d", error);
return error;
}
#ifdef YAFFS_NEW_XATTR
static ssize_t yaffs_getxattr(struct dentry * dentry, struct inode *inode,
const char *name, void *buff, size_t size)
{
#else
static ssize_t yaffs_getxattr(struct dentry * dentry, const char *name,
void *buff, size_t size)
{
struct inode *inode = dentry->d_inode;
#endif
int error = 0;
struct yaffs_dev *dev;
struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
yaffs_trace(YAFFS_TRACE_OS,
"yaffs_getxattr \"%s\" from object %d",
name, obj->obj_id);
if (error == 0) {
dev = obj->my_dev;
yaffs_gross_lock(dev);
error = yaffs_get_xattrib(obj, name, buff, size);
yaffs_gross_unlock(dev);
}