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firmware/br-ext-chip-goke/board/gk7205v200/kernel/patches/00_fs-yaffs2-yaffs_vfs.c.patch

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--- linux-4.9.37/fs/yaffs2/yaffs_vfs.c 1970-01-01 03:00:00.000000000 +0300
+++ linux-4.9.y/fs/yaffs2/yaffs_vfs.c 2021-06-07 13:01:34.000000000 +0300
@@ -0,0 +1,3751 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ * for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ * 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);
+
+ }
+ yaffs_trace(YAFFS_TRACE_OS, "yaffs_getxattr done returning %d", error);
+
+ return error;
+}
+
+static int yaffs_removexattr(struct dentry *dentry, const char *name)
+{
+ struct inode *inode = dentry->d_inode;
+ int error = 0;
+ struct yaffs_dev *dev;
+ struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
+
+ yaffs_trace(YAFFS_TRACE_OS,
+ "yaffs_removexattr of object %d", obj->obj_id);
+
+ if (error == 0) {
+ int result;
+ dev = obj->my_dev;
+ yaffs_gross_lock(dev);
+ result = yaffs_remove_xattrib(obj, name);
+ if (result == YAFFS_OK)
+ error = 0;
+ else if (result < 0)
+ error = result;
+ yaffs_gross_unlock(dev);
+
+ }
+ yaffs_trace(YAFFS_TRACE_OS,
+ "yaffs_removexattr done returning %d", error);
+
+ return error;
+}
+#endif
+
+static ssize_t yaffs_listxattr(struct dentry * dentry, char *buff, size_t size)
+{
+ struct inode *inode = dentry->d_inode;
+ int error = 0;
+ struct yaffs_dev *dev;
+ struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
+
+ yaffs_trace(YAFFS_TRACE_OS,
+ "yaffs_listxattr of object %d", obj->obj_id);
+
+ if (error == 0) {
+ dev = obj->my_dev;
+ yaffs_gross_lock(dev);
+ error = yaffs_list_xattrib(obj, buff, size);
+ yaffs_gross_unlock(dev);
+
+ }
+ yaffs_trace(YAFFS_TRACE_OS,
+ "yaffs_listxattr done returning %d", error);
+
+ return error;
+}
+
+
+static const struct inode_operations yaffs_file_inode_operations = {
+ .setattr = yaffs_setattr,
+#ifdef YAFFS_USE_XATTR
+ .setxattr = yaffs_setxattr,
+ .getxattr = yaffs_getxattr,
+ .removexattr = yaffs_removexattr,
+#endif
+ .listxattr = yaffs_listxattr,
+};
+
+
+static int yaffs_readlink(struct dentry *dentry, char __user * buffer,
+ int buflen)
+{
+ unsigned char *alias;
+ int ret;
+
+ struct yaffs_dev *dev = yaffs_dentry_to_obj(dentry)->my_dev;
+
+ yaffs_gross_lock(dev);
+
+ alias = yaffs_get_symlink_alias(yaffs_dentry_to_obj(dentry));
+
+ yaffs_gross_unlock(dev);
+
+ if (!alias)
+ return -ENOMEM;
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 15, 0)
+ ret = vfs_readlink(dentry, buffer, buflen, alias);
+#else
+ ret = readlink_copy(buffer, buflen, alias);
+#endif
+ kfree(alias);
+ return ret;
+}
+
+#if (YAFFS_NEW_GET_LINK == 0)
+#if (YAFFS_NEW_FOLLOW_LINK == 1)
+static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
+{
+ void *ret;
+#else
+static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
+{
+ int ret
+#endif
+ unsigned char *alias;
+ int ret_int = 0;
+ struct yaffs_dev *dev = yaffs_dentry_to_obj(dentry)->my_dev;
+
+ yaffs_gross_lock(dev);
+
+ alias = yaffs_get_symlink_alias(yaffs_dentry_to_obj(dentry));
+ yaffs_gross_unlock(dev);
+
+ if (!alias) {
+ ret_int = -ENOMEM;
+ goto out;
+ }
+#if (YAFFS_NEW_FOLLOW_LINK == 1)
+ nd_set_link(nd, alias);
+ ret = alias;
+out:
+ if (ret_int)
+ ret = ERR_PTR(ret_int);
+ return ret;
+#else
+ ret = vfs_follow_link(nd, alias);
+ kfree(alias);
+out:
+ if (ret_int)
+ ret = ret_int;
+ return ret;
+#endif
+}
+#else
+static const char *yaffs_get_link(struct dentry *dentry, struct inode *inode, struct delayed_call *done)
+{
+ unsigned char *alias;
+ struct yaffs_dev *dev;
+
+ if (!dentry)
+ return ERR_PTR(-ECHILD);
+
+ dev = yaffs_dentry_to_obj(dentry)->my_dev;
+
+ yaffs_gross_lock(dev);
+
+ alias = yaffs_get_symlink_alias(yaffs_dentry_to_obj(dentry));
+ yaffs_gross_unlock(dev);
+
+ if (!alias)
+ return ERR_PTR(-ENOMEM);
+ set_delayed_call(done, kfree_link, alias);
+ return alias;
+}
+#endif
+
+#ifdef YAFFS_HAS_PUT_INODE
+
+/* For now put inode is just for debugging
+ * Put inode is called when the inode **structure** is put.
+ */
+static void yaffs_put_inode(struct inode *inode)
+{
+ yaffs_trace(YAFFS_TRACE_OS,
+ "yaffs_put_inode: ino %d, count %d"),
+ (int)inode->i_ino, atomic_read(&inode->i_count);
+
+}
+#endif
+
+#if (YAFFS_NEW_FOLLOW_LINK == 1)
+void yaffs_put_link(struct dentry *dentry, struct nameidata *nd, void *alias)
+{
+ kfree(alias);
+}
+#endif
+
+static const struct inode_operations yaffs_symlink_inode_operations = {
+ .readlink = yaffs_readlink,
+#if (YAFFS_NEW_GET_LINK == 1)
+ .get_link = yaffs_get_link,
+#else
+ .follow_link = yaffs_follow_link,
+#endif
+#if (YAFFS_NEW_FOLLOW_LINK == 1)
+ .put_link = yaffs_put_link,
+#endif
+ .setattr = yaffs_setattr,
+#ifdef YAFFS_USE_XATTR
+ .setxattr = yaffs_setxattr,
+ .getxattr = yaffs_getxattr,
+ .removexattr = yaffs_removexattr,
+#endif
+ .listxattr = yaffs_listxattr,
+};
+
+#ifdef YAFFS_USE_OWN_IGET
+
+static struct inode *yaffs_iget(struct super_block *sb, unsigned long ino)
+{
+ struct inode *inode;
+ struct yaffs_obj *obj;
+ struct yaffs_dev *dev = yaffs_super_to_dev(sb);
+
+ yaffs_trace(YAFFS_TRACE_OS, "yaffs_iget for %lu", ino);
+
+ inode = iget_locked(sb, ino);
+ if (!inode)
+ return ERR_PTR(-ENOMEM);
+ if (!(inode->i_state & I_NEW))
+ return inode;
+
+ /* NB This is called as a side effect of other functions, but
+ * we had to release the lock to prevent deadlocks, so
+ * need to lock again.
+ */
+
+ yaffs_gross_lock(dev);
+
+ obj = yaffs_find_by_number(dev, inode->i_ino);
+
+ yaffs_fill_inode_from_obj(inode, obj);
+
+ yaffs_gross_unlock(dev);
+
+ unlock_new_inode(inode);
+ return inode;
+}
+
+#else
+
+static void yaffs_read_inode(struct inode *inode)
+{
+ /* NB This is called as a side effect of other functions, but
+ * we had to release the lock to prevent deadlocks, so
+ * need to lock again.
+ */
+
+ struct yaffs_obj *obj;
+ struct yaffs_dev *dev = yaffs_super_to_dev(inode->i_sb);
+
+ yaffs_trace(YAFFS_TRACE_OS,
+ "yaffs_read_inode for %d", (int)inode->i_ino);
+
+ if (current != yaffs_dev_to_lc(dev)->readdir_process)
+ yaffs_gross_lock(dev);
+
+ obj = yaffs_find_by_number(dev, inode->i_ino);
+
+ yaffs_fill_inode_from_obj(inode, obj);
+
+ if (current != yaffs_dev_to_lc(dev)->readdir_process)
+ yaffs_gross_unlock(dev);
+}
+
+#endif
+
+
+
+struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
+ struct yaffs_obj *obj)
+{
+ struct inode *inode;
+
+ if (!sb) {
+ yaffs_trace(YAFFS_TRACE_OS,
+ "yaffs_get_inode for NULL super_block!!");
+ return NULL;
+
+ }
+
+ if (!obj) {
+ yaffs_trace(YAFFS_TRACE_OS,
+ "yaffs_get_inode for NULL object!!");
+ return NULL;
+
+ }
+
+ yaffs_trace(YAFFS_TRACE_OS,
+ "yaffs_get_inode for object %d", obj->obj_id);
+
+ inode = Y_IGET(sb, obj->obj_id);
+ if (IS_ERR(inode))
+ return NULL;
+
+ /* NB Side effect: iget calls back to yaffs_read_inode(). */
+ /* iget also increments the inode's i_count */
+ /* NB You can't be holding gross_lock or deadlock will happen! */
+
+ return inode;
+}
+
+
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 29)
+#define YCRED(x) x
+#else
+#define YCRED(x) (x->cred)
+#endif
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3,14,0)
+#define YPROC_uid(p) (YCRED(p)->fsuid)
+#define YPROC_gid(p) (YCRED(p)->fsgid)
+#define EXTRACT_gid(x) x
+#define EXTRACT_uid(x) x
+#define MAKE_gid(x) x
+#define MAKE_uid(x) x
+#else
+#define YPROC_uid(p) from_kuid(&init_user_ns, YCRED(p)->fsuid)
+#define YPROC_gid(p) from_kgid(&init_user_ns, YCRED(p)->fsgid)
+#define EXTRACT_gid(x) from_kgid(&init_user_ns, x)
+#define EXTRACT_uid(x) from_kuid(&init_user_ns, x)
+#define MAKE_gid(x) make_kgid(&init_user_ns, x)
+#define MAKE_uid(x) make_kuid(&init_user_ns, x)
+#endif
+
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 4, 0))
+static int yaffs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
+ dev_t rdev)
+#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
+ dev_t rdev)
+#else
+static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
+ int rdev)
+#endif
+{
+ struct inode *inode;
+
+ struct yaffs_obj *obj = NULL;
+ struct yaffs_dev *dev;
+
+ struct yaffs_obj *parent = yaffs_inode_to_obj(dir);
+
+ int error = -ENOSPC;
+ uid_t uid = YPROC_uid(current);
+ gid_t gid =
+ (dir->i_mode & S_ISGID) ? EXTRACT_gid(dir->i_gid) : YPROC_gid(current);
+
+ if ((dir->i_mode & S_ISGID) && S_ISDIR(mode))
+ mode |= S_ISGID;
+
+ if (parent) {
+ yaffs_trace(YAFFS_TRACE_OS,
+ "yaffs_mknod: parent object %d type %d",
+ parent->obj_id, parent->variant_type);
+ } else {
+ yaffs_trace(YAFFS_TRACE_OS,
+ "yaffs_mknod: could not get parent object");
+ return -EPERM;
+ }
+
+ yaffs_trace(YAFFS_TRACE_OS,
+ "yaffs_mknod: making oject for %s, mode %x dev %x",
+ dentry->d_name.name, mode, rdev);
+
+ dev = parent->my_dev;
+
+ yaffs_gross_lock(dev);
+
+ switch (mode & S_IFMT) {
+ default:
+ /* Special (socket, fifo, device...) */
+ yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making special");
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+ obj =
+ yaffs_create_special(parent, dentry->d_name.name, mode, uid,
+ gid, old_encode_dev(rdev));
+#else
+ obj =
+ yaffs_create_special(parent, dentry->d_name.name, mode, uid,
+ gid, rdev);
+#endif
+ break;
+ case S_IFREG: /* file */
+ yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making file");
+ obj = yaffs_create_file(parent, dentry->d_name.name, mode, uid,
+ gid);
+ break;
+ case S_IFDIR: /* directory */
+ yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making directory");
+ obj = yaffs_create_dir(parent, dentry->d_name.name, mode,
+ uid, gid);
+ break;
+ case S_IFLNK: /* symlink */
+ yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making symlink");
+ obj = NULL; /* Do we ever get here? */
+ break;
+ }
+
+ /* Can not call yaffs_get_inode() with gross lock held */
+ yaffs_gross_unlock(dev);
+
+ if (obj) {
+ inode = yaffs_get_inode(dir->i_sb, mode, rdev, obj);
+ d_instantiate(dentry, inode);
+ update_dir_time(dir);
+ yaffs_trace(YAFFS_TRACE_OS,
+ "yaffs_mknod created object %d count = %d",
+ obj->obj_id, atomic_read(&inode->i_count));
+ error = 0;
+ yaffs_fill_inode_from_obj(dir, parent);
+ } else {
+ yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod failed making object");
+ error = -ENOMEM;
+ }
+
+ return error;
+}
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 4, 0))
+static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
+#else
+static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
+#endif
+{
+ int ret_val;
+ yaffs_trace(YAFFS_TRACE_OS, "yaffs_mkdir");
+ ret_val = yaffs_mknod(dir, dentry, mode | S_IFDIR, 0);
+ return ret_val;
+}
+
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 6, 0))
+static int yaffs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
+ bool dummy)
+#elif (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 4, 0))
+static int yaffs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
+ struct nameidata *n)
+#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
+ struct nameidata *n)
+#else
+static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode)
+#endif
+{
+ yaffs_trace(YAFFS_TRACE_OS, "yaffs_create");
+ return yaffs_mknod(dir, dentry, mode | S_IFREG, 0);
+}
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 6, 0))
+static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
+ unsigned int dummy)
+#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
+ struct nameidata *n)
+#else
+static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry)
+#endif
+{
+ struct yaffs_obj *obj;
+ struct inode *inode = NULL; /* NCB 2.5/2.6 needs NULL here */
+
+ struct yaffs_dev *dev = yaffs_inode_to_obj(dir)->my_dev;
+
+ if (current != yaffs_dev_to_lc(dev)->readdir_process)
+ yaffs_gross_lock(dev);
+
+ yaffs_trace(YAFFS_TRACE_OS, "yaffs_lookup for %d:%s",
+ yaffs_inode_to_obj(dir)->obj_id, dentry->d_name.name);
+
+ obj = yaffs_find_by_name(yaffs_inode_to_obj(dir), dentry->d_name.name);
+
+ obj = yaffs_get_equivalent_obj(obj); /* in case it was a hardlink */
+
+ /* Can't hold gross lock when calling yaffs_get_inode() */
+ if (current != yaffs_dev_to_lc(dev)->readdir_process)
+ yaffs_gross_unlock(dev);
+
+ if (obj) {
+ yaffs_trace(YAFFS_TRACE_OS,
+ "yaffs_lookup found %d", obj->obj_id);
+
+ inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
+ } else {
+ yaffs_trace(YAFFS_TRACE_OS, "yaffs_lookup not found");
+
+ }
+
+/* added NCB for 2.5/6 compatability - forces add even if inode is
+ * NULL which creates dentry hash */
+ d_add(dentry, inode);
+
+ return NULL;
+}
+
+/*
+ * Create a link...
+ */
+static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
+ struct dentry *dentry)
+{
+ struct inode *inode = old_dentry->d_inode;
+ struct yaffs_obj *obj = NULL;
+ struct yaffs_obj *link = NULL;
+ struct yaffs_dev *dev;
+
+ yaffs_trace(YAFFS_TRACE_OS, "yaffs_link");
+
+ obj = yaffs_inode_to_obj(inode);
+ dev = obj->my_dev;
+
+ yaffs_gross_lock(dev);
+
+ if (!S_ISDIR(inode->i_mode)) /* Don't link directories */
+ link =
+ yaffs_link_obj(yaffs_inode_to_obj(dir), dentry->d_name.name,
+ obj);
+
+ if (link) {
+ set_nlink(old_dentry->d_inode, yaffs_get_obj_link_count(obj));
+ d_instantiate(dentry, old_dentry->d_inode);
+ atomic_inc(&old_dentry->d_inode->i_count);
+ yaffs_trace(YAFFS_TRACE_OS,
+ "yaffs_link link count %d i_count %d",
+ old_dentry->d_inode->i_nlink,
+ atomic_read(&old_dentry->d_inode->i_count));
+ }
+
+ yaffs_gross_unlock(dev);
+
+ if (link) {
+ update_dir_time(dir);
+ return 0;
+ }
+
+ return -EPERM;
+}
+
+static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
+ const char *symname)
+{
+ struct yaffs_obj *obj;
+ struct yaffs_dev *dev;
+ uid_t uid = YPROC_uid(current);
+ gid_t gid =
+ (dir->i_mode & S_ISGID) ? EXTRACT_gid(dir->i_gid) : YPROC_gid(current);
+
+ yaffs_trace(YAFFS_TRACE_OS, "yaffs_symlink");
+
+ if (strnlen(dentry->d_name.name, YAFFS_MAX_NAME_LENGTH + 1) >
+ YAFFS_MAX_NAME_LENGTH)
+ return -ENAMETOOLONG;
+
+ if (strnlen(symname, YAFFS_MAX_ALIAS_LENGTH + 1) >
+ YAFFS_MAX_ALIAS_LENGTH)
+ return -ENAMETOOLONG;
+
+ dev = yaffs_inode_to_obj(dir)->my_dev;
+ yaffs_gross_lock(dev);
+ obj = yaffs_create_symlink(yaffs_inode_to_obj(dir), dentry->d_name.name,
+ S_IFLNK | S_IRWXUGO, uid, gid, symname);
+ yaffs_gross_unlock(dev);
+
+ if (obj) {
+ struct inode *inode;
+
+ inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
+ d_instantiate(dentry, inode);
+ update_dir_time(dir);
+ yaffs_trace(YAFFS_TRACE_OS, "symlink created OK");
+ return 0;
+ } else {
+ yaffs_trace(YAFFS_TRACE_OS, "symlink not created");
+ }
+
+ return -ENOMEM;
+}
+
+/*
+ * The VFS layer already does all the dentry stuff for rename.
+ *
+ * NB: POSIX says you can rename an object over an old object of the same name
+ */
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4, 9, 0))
+static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
+ struct inode *new_dir, struct dentry *new_dentry, unsigned int unused)
+#else
+static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
+ struct inode *new_dir, struct dentry *new_dentry)
+#endif
+{
+ struct yaffs_dev *dev;
+ int ret_val = YAFFS_FAIL;
+ struct yaffs_obj *target;
+
+ yaffs_trace(YAFFS_TRACE_OS, "yaffs_rename");
+ dev = yaffs_inode_to_obj(old_dir)->my_dev;
+
+ yaffs_gross_lock(dev);
+
+ /* Check if the target is an existing directory that is not empty. */
+ target = yaffs_find_by_name(yaffs_inode_to_obj(new_dir),
+ new_dentry->d_name.name);
+
+ if (target && target->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY &&
+ !list_empty(&target->variant.dir_variant.children)) {
+
+ yaffs_trace(YAFFS_TRACE_OS, "target is non-empty dir");
+
+ ret_val = YAFFS_FAIL;
+ } else {
+ /* Now does unlinking internally using shadowing mechanism */
+ yaffs_trace(YAFFS_TRACE_OS, "calling yaffs_rename_obj");
+
+ ret_val = yaffs_rename_obj(yaffs_inode_to_obj(old_dir),
+ old_dentry->d_name.name,
+ yaffs_inode_to_obj(new_dir),
+ new_dentry->d_name.name);
+ }
+ yaffs_gross_unlock(dev);
+
+ if (ret_val == YAFFS_OK) {
+ if (target)
+ inode_dec_link_count(new_dentry->d_inode);
+
+ update_dir_time(old_dir);
+ if (old_dir != new_dir)
+ update_dir_time(new_dir);
+ return 0;
+ } else {
+ return -ENOTEMPTY;
+ }
+}
+
+
+
+
+static int yaffs_unlink(struct inode *dir, struct dentry *dentry)
+{
+ int ret_val;
+
+ struct yaffs_dev *dev;
+ struct yaffs_obj *obj;
+
+ yaffs_trace(YAFFS_TRACE_OS, "yaffs_unlink %d:%s",
+ (int)(dir->i_ino), dentry->d_name.name);
+ obj = yaffs_inode_to_obj(dir);
+ dev = obj->my_dev;
+
+ yaffs_gross_lock(dev);
+
+ ret_val = yaffs_unlinker(obj, dentry->d_name.name);
+
+ if (ret_val == YAFFS_OK) {
+ inode_dec_link_count(dentry->d_inode);
+ dir->i_version++;
+ yaffs_gross_unlock(dev);
+ update_dir_time(dir);
+ return 0;
+ }
+ yaffs_gross_unlock(dev);
+ return -ENOTEMPTY;
+}
+
+
+
+static const struct inode_operations yaffs_dir_inode_operations = {
+ .create = yaffs_create,
+ .lookup = yaffs_lookup,
+ .link = yaffs_link,
+ .unlink = yaffs_unlink,
+ .symlink = yaffs_symlink,
+ .mkdir = yaffs_mkdir,
+ .rmdir = yaffs_unlink,
+ .mknod = yaffs_mknod,
+ .rename = yaffs_rename,
+ .setattr = yaffs_setattr,
+ .listxattr = yaffs_listxattr,
+#ifdef YAFFS_USE_XATTR
+ .setxattr = yaffs_setxattr,
+ .getxattr = yaffs_getxattr,
+ .removexattr = yaffs_removexattr,
+#endif
+};
+
+/*-----------------------------------------------------------------*/
+/* Directory search context allows us to unlock access to yaffs during
+ * filldir without causing problems with the directory being modified.
+ * This is similar to the tried and tested mechanism used in yaffs direct.
+ *
+ * A search context iterates along a doubly linked list of siblings in the
+ * directory. If the iterating object is deleted then this would corrupt
+ * the list iteration, likely causing a crash. The search context avoids
+ * this by using the remove_obj_fn to move the search context to the
+ * next object before the object is deleted.
+ *
+ * Many readdirs (and thus seach conexts) may be alive simulateously so
+ * each struct yaffs_dev has a list of these.
+ *
+ * A seach context lives for the duration of a readdir.
+ *
+ * All these functions must be called while yaffs is locked.
+ */
+
+struct yaffs_search_context {
+ struct yaffs_dev *dev;
+ struct yaffs_obj *dir_obj;
+ struct yaffs_obj *next_return;
+ struct list_head others;
+};
+
+/*
+ * yaffs_new_search() creates a new search context, initialises it and
+ * adds it to the device's search context list.
+ *
+ * Called at start of readdir.
+ */
+static struct yaffs_search_context *yaffs_new_search(struct yaffs_obj *dir)
+{
+ struct yaffs_dev *dev = dir->my_dev;
+ struct yaffs_search_context *sc =
+ kmalloc(sizeof(struct yaffs_search_context), GFP_NOFS);
+ if (sc) {
+ sc->dir_obj = dir;
+ sc->dev = dev;
+ if (list_empty(&sc->dir_obj->variant.dir_variant.children))
+ sc->next_return = NULL;
+ else
+ sc->next_return =
+ list_entry(dir->variant.dir_variant.children.next,
+ struct yaffs_obj, siblings);
+ INIT_LIST_HEAD(&sc->others);
+ list_add(&sc->others, &(yaffs_dev_to_lc(dev)->search_contexts));
+ }
+ return sc;
+}
+
+/*
+ * yaffs_search_end() disposes of a search context and cleans up.
+ */
+static void yaffs_search_end(struct yaffs_search_context *sc)
+{
+ if (sc) {
+ list_del(&sc->others);
+ kfree(sc);
+ }
+}
+
+/*
+ * yaffs_search_advance() moves a search context to the next object.
+ * Called when the search iterates or when an object removal causes
+ * the search context to be moved to the next object.
+ */
+static void yaffs_search_advance(struct yaffs_search_context *sc)
+{
+ if (!sc)
+ return;
+
+ if (sc->next_return == NULL ||
+ list_empty(&sc->dir_obj->variant.dir_variant.children))
+ sc->next_return = NULL;
+ else {
+ struct list_head *next = sc->next_return->siblings.next;
+
+ if (next == &sc->dir_obj->variant.dir_variant.children)
+ sc->next_return = NULL; /* end of list */
+ else
+ sc->next_return =
+ list_entry(next, struct yaffs_obj, siblings);
+ }
+}
+
+/*
+ * yaffs_remove_obj_callback() is called when an object is unlinked.
+ * We check open search contexts and advance any which are currently
+ * on the object being iterated.
+ */
+static void yaffs_remove_obj_callback(struct yaffs_obj *obj)
+{
+
+ struct list_head *i;
+ struct yaffs_search_context *sc;
+ struct list_head *search_contexts =
+ &(yaffs_dev_to_lc(obj->my_dev)->search_contexts);
+
+ /* Iterate through the directory search contexts.
+ * If any are currently on the object being removed, then advance
+ * the search context to the next object to prevent a hanging pointer.
+ */
+ list_for_each(i, search_contexts) {
+ sc = list_entry(i, struct yaffs_search_context, others);
+ if (sc->next_return == obj)
+ yaffs_search_advance(sc);
+ }
+
+}
+
+
+/*-----------------------------------------------------------------*/
+
+#ifdef YAFFS_USE_DIR_ITERATE
+static int yaffs_iterate(struct file *f, struct dir_context *dc)
+{
+ struct yaffs_obj *obj;
+ struct yaffs_dev *dev;
+ struct yaffs_search_context *sc;
+ unsigned long curoffs;
+ struct yaffs_obj *l;
+ int ret_val = 0;
+
+ char name[YAFFS_MAX_NAME_LENGTH + 1];
+
+ obj = yaffs_dentry_to_obj(Y_GET_DENTRY(f));
+ dev = obj->my_dev;
+
+ yaffs_gross_lock(dev);
+
+ yaffs_dev_to_lc(dev)->readdir_process = current;
+
+ sc = yaffs_new_search(obj);
+ if (!sc) {
+ ret_val = -ENOMEM;
+ goto out;
+ }
+
+ if (!dir_emit_dots(f, dc))
+ return 0;
+
+ curoffs = 1;
+
+ while (sc->next_return) {
+ curoffs++;
+ l = sc->next_return;
+ if (curoffs >= dc->pos) {
+ int this_inode = yaffs_get_obj_inode(l);
+ int this_type = yaffs_get_obj_type(l);
+
+ yaffs_get_obj_name(l, name, YAFFS_MAX_NAME_LENGTH + 1);
+ yaffs_trace(YAFFS_TRACE_OS,
+ "yaffs_readdir: %s inode %d",
+ name, yaffs_get_obj_inode(l));
+
+ yaffs_gross_unlock(dev);
+
+ if (!dir_emit(dc,
+ name,
+ strlen(name),
+ this_inode,
+ this_type)) {
+ yaffs_gross_lock(dev);
+ goto out;
+ }
+
+ yaffs_gross_lock(dev);
+
+ dc->pos++;
+ f->f_pos++;
+ }
+ yaffs_search_advance(sc);
+ }
+
+out:
+ yaffs_search_end(sc);
+ yaffs_dev_to_lc(dev)->readdir_process = NULL;
+ yaffs_gross_unlock(dev);
+
+ return ret_val;
+}
+
+#else
+
+static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
+{
+ struct yaffs_obj *obj;
+ struct yaffs_dev *dev;
+ struct yaffs_search_context *sc;
+ struct inode *inode = Y_GET_DENTRY(f)->d_inode;
+ unsigned long offset, curoffs;
+ struct yaffs_obj *l;
+ int ret_val = 0;
+
+ char name[YAFFS_MAX_NAME_LENGTH + 1];
+
+ obj = yaffs_dentry_to_obj(Y_GET_DENTRY(f));
+ dev = obj->my_dev;
+
+ yaffs_gross_lock(dev);
+
+ yaffs_dev_to_lc(dev)->readdir_process = current;
+
+ offset = f->f_pos;
+
+ sc = yaffs_new_search(obj);
+ if (!sc) {
+ ret_val = -ENOMEM;
+ goto out;
+ }
+
+ yaffs_trace(YAFFS_TRACE_OS,
+ "yaffs_readdir: starting at %d", (int)offset);
+
+ if (offset == 0) {
+ yaffs_trace(YAFFS_TRACE_OS,
+ "yaffs_readdir: entry . ino %d",
+ (int)inode->i_ino);
+ yaffs_gross_unlock(dev);
+ if (filldir(dirent, ".", 1, offset, inode->i_ino, DT_DIR) < 0) {
+ yaffs_gross_lock(dev);
+ goto out;
+ }
+ yaffs_gross_lock(dev);
+ offset++;
+ f->f_pos++;
+ }
+ if (offset == 1) {
+ yaffs_trace(YAFFS_TRACE_OS,
+ "yaffs_readdir: entry .. ino %d",
+ (int)f->f_dentry->d_parent->d_inode->i_ino);
+ yaffs_gross_unlock(dev);
+ if (filldir(dirent, "..", 2, offset,
+ f->f_dentry->d_parent->d_inode->i_ino,
+ DT_DIR) < 0) {
+ yaffs_gross_lock(dev);
+ goto out;
+ }
+ yaffs_gross_lock(dev);
+ offset++;
+ f->f_pos++;
+ }
+
+ curoffs = 1;
+
+ /* If the directory has changed since the open or last call to
+ readdir, rewind to after the 2 canned entries. */
+ if (f->f_version != inode->i_version) {
+ offset = 2;
+ f->f_pos = offset;
+ f->f_version = inode->i_version;
+ }
+
+ while (sc->next_return) {
+ curoffs++;
+ l = sc->next_return;
+ if (curoffs >= offset) {
+ int this_inode = yaffs_get_obj_inode(l);
+ int this_type = yaffs_get_obj_type(l);
+
+ yaffs_get_obj_name(l, name, YAFFS_MAX_NAME_LENGTH + 1);
+ yaffs_trace(YAFFS_TRACE_OS,
+ "yaffs_readdir: %s inode %d",
+ name, yaffs_get_obj_inode(l));
+
+ yaffs_gross_unlock(dev);
+
+ if (filldir(dirent,
+ name,
+ strlen(name),
+ offset, this_inode, this_type) < 0) {
+ yaffs_gross_lock(dev);
+ goto out;
+ }
+
+ yaffs_gross_lock(dev);
+
+ offset++;
+ f->f_pos++;
+ }
+ yaffs_search_advance(sc);
+ }
+
+out:
+ yaffs_search_end(sc);
+ yaffs_dev_to_lc(dev)->readdir_process = NULL;
+ yaffs_gross_unlock(dev);
+
+ return ret_val;
+}
+
+#endif
+
+static const struct file_operations yaffs_dir_operations = {
+ .read = generic_read_dir,
+#ifdef YAFFS_USE_DIR_ITERATE
+ .iterate = yaffs_iterate,
+#else
+ .readdir = yaffs_readdir,
+#endif
+ .fsync = yaffs_sync_object,
+ .llseek = generic_file_llseek,
+};
+
+static void yaffs_fill_inode_from_obj(struct inode *inode,
+ struct yaffs_obj *obj)
+{
+ if (inode && obj) {
+
+ /* Check mode against the variant type and attempt to repair if broken. */
+ u32 mode = obj->yst_mode;
+ switch (obj->variant_type) {
+ case YAFFS_OBJECT_TYPE_FILE:
+ if (!S_ISREG(mode)) {
+ obj->yst_mode &= ~S_IFMT;
+ obj->yst_mode |= S_IFREG;
+ }
+
+ break;
+ case YAFFS_OBJECT_TYPE_SYMLINK:
+ if (!S_ISLNK(mode)) {
+ obj->yst_mode &= ~S_IFMT;
+ obj->yst_mode |= S_IFLNK;
+ }
+
+ break;
+ case YAFFS_OBJECT_TYPE_DIRECTORY:
+ if (!S_ISDIR(mode)) {
+ obj->yst_mode &= ~S_IFMT;
+ obj->yst_mode |= S_IFDIR;
+ }
+
+ break;
+ case YAFFS_OBJECT_TYPE_UNKNOWN:
+ case YAFFS_OBJECT_TYPE_HARDLINK:
+ case YAFFS_OBJECT_TYPE_SPECIAL:
+ default:
+ /* TODO? */
+ break;
+ }
+
+ inode->i_flags |= S_NOATIME;
+
+ inode->i_ino = obj->obj_id;
+ inode->i_mode = obj->yst_mode;
+ inode->i_uid = MAKE_uid(obj->yst_uid);
+ inode->i_gid = MAKE_gid(obj->yst_gid);
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19))
+ inode->i_blksize = inode->i_sb->s_blocksize;
+#endif
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+
+ inode->i_rdev = old_decode_dev(obj->yst_rdev);
+ inode->i_atime.tv_sec = (time_t) (obj->yst_atime);
+ inode->i_atime.tv_nsec = 0;
+ inode->i_mtime.tv_sec = (time_t) obj->yst_mtime;
+ inode->i_mtime.tv_nsec = 0;
+ inode->i_ctime.tv_sec = (time_t) obj->yst_ctime;
+ inode->i_ctime.tv_nsec = 0;
+#else
+ inode->i_rdev = obj->yst_rdev;
+ inode->i_atime = obj->yst_atime;
+ inode->i_mtime = obj->yst_mtime;
+ inode->i_ctime = obj->yst_ctime;
+#endif
+ inode->i_size = yaffs_get_obj_length(obj);
+ inode->i_blocks = (inode->i_size + 511) >> 9;
+
+ set_nlink(inode, yaffs_get_obj_link_count(obj));
+
+ yaffs_trace(YAFFS_TRACE_OS,
+ "yaffs_fill_inode mode %x uid %d gid %d size %lld count %d",
+ inode->i_mode, obj->yst_uid, obj->yst_gid,
+ inode->i_size, atomic_read(&inode->i_count));
+
+ switch (obj->yst_mode & S_IFMT) {
+ default: /* fifo, device or socket */
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+ init_special_inode(inode, obj->yst_mode,
+ old_decode_dev(obj->yst_rdev));
+#else
+ init_special_inode(inode, obj->yst_mode,
+ (dev_t) (obj->yst_rdev));
+#endif
+ break;
+ case S_IFREG: /* file */
+ inode->i_op = &yaffs_file_inode_operations;
+ inode->i_fop = &yaffs_file_operations;
+ inode->i_mapping->a_ops =
+ &yaffs_file_address_operations;
+ break;
+ case S_IFDIR: /* directory */
+ inode->i_op = &yaffs_dir_inode_operations;
+ inode->i_fop = &yaffs_dir_operations;
+ break;
+ case S_IFLNK: /* symlink */
+ inode->i_op = &yaffs_symlink_inode_operations;
+ break;
+ }
+
+ yaffs_inode_to_obj_lv(inode) = obj;
+
+ obj->my_inode = inode;
+
+ } else {
+ yaffs_trace(YAFFS_TRACE_OS,
+ "yaffs_fill_inode invalid parameters");
+ }
+
+}
+
+
+
+/*
+ * yaffs background thread functions .
+ * yaffs_bg_thread_fn() the thread function
+ * yaffs_bg_start() launches the background thread.
+ * yaffs_bg_stop() cleans up the background thread.
+ *
+ * NB:
+ * The thread should only run after the yaffs is initialised
+ * The thread should be stopped before yaffs is unmounted.
+ * The thread should not do any writing while the fs is in read only.
+ */
+
+static unsigned yaffs_bg_gc_urgency(struct yaffs_dev *dev)
+{
+ unsigned erased_chunks =
+ dev->n_erased_blocks * dev->param.chunks_per_block;
+ struct yaffs_linux_context *context = yaffs_dev_to_lc(dev);
+ unsigned scattered = 0; /* Free chunks not in an erased block */
+
+ if (erased_chunks < dev->n_free_chunks)
+ scattered = (dev->n_free_chunks - erased_chunks);
+
+ if (!context->bg_running)
+ return 0;
+ else if (scattered < (dev->param.chunks_per_block * 2))
+ return 0;
+ else if (erased_chunks > dev->n_free_chunks / 2)
+ return 0;
+ else if (erased_chunks > dev->n_free_chunks / 4)
+ return 1;
+ else
+ return 2;
+}
+
+#ifdef YAFFS_COMPILE_BACKGROUND
+
+void yaffs_background_waker(unsigned long data)
+{
+ wake_up_process((struct task_struct *)data);
+}
+
+static int yaffs_bg_thread_fn(void *data)
+{
+ struct yaffs_dev *dev = (struct yaffs_dev *)data;
+ struct yaffs_linux_context *context = yaffs_dev_to_lc(dev);
+ unsigned long now = jiffies;
+ unsigned long next_dir_update = now;
+ unsigned long next_gc = now;
+ unsigned long expires;
+ unsigned int urgency;
+
+ int gc_result;
+ struct timer_list timer;
+
+ yaffs_trace(YAFFS_TRACE_BACKGROUND,
+ "yaffs_background starting for dev %p", (void *)dev);
+
+#ifdef YAFFS_COMPILE_FREEZER
+ set_freezable();
+#endif
+ while (context->bg_running) {
+ yaffs_trace(YAFFS_TRACE_BACKGROUND, "yaffs_background");
+
+ if (kthread_should_stop())
+ break;
+
+#ifdef YAFFS_COMPILE_FREEZER
+ if (try_to_freeze())
+ continue;
+#endif
+ yaffs_gross_lock(dev);
+
+ now = jiffies;
+
+ if (time_after(now, next_dir_update) && yaffs_bg_enable) {
+ yaffs_update_dirty_dirs(dev);
+ next_dir_update = now + HZ;
+ }
+
+ if (time_after(now, next_gc) && yaffs_bg_enable) {
+ if (!dev->is_checkpointed) {
+ urgency = yaffs_bg_gc_urgency(dev);
+ gc_result = yaffs_bg_gc(dev, urgency);
+ if (urgency > 1)
+ next_gc = now + HZ / 20 + 1;
+ else if (urgency > 0)
+ next_gc = now + HZ / 10 + 1;
+ else
+ next_gc = now + HZ * 2;
+ } else {
+ /*
+ * gc not running so set to next_dir_update
+ * to cut down on wake ups
+ */
+ next_gc = next_dir_update;
+ }
+ }
+ yaffs_gross_unlock(dev);
+#if 1
+ expires = next_dir_update;
+ if (time_before(next_gc, expires))
+ expires = next_gc;
+ if (time_before(expires, now))
+ expires = now + HZ;
+
+ Y_INIT_TIMER(&timer);
+ timer.expires = expires + 1;
+ timer.data = (unsigned long)current;
+ timer.function = yaffs_background_waker;
+
+ set_current_state(TASK_INTERRUPTIBLE);
+ add_timer(&timer);
+ schedule();
+ del_timer_sync(&timer);
+#else
+ msleep(10);
+#endif
+ }
+
+ return 0;
+}
+
+static int yaffs_bg_start(struct yaffs_dev *dev)
+{
+ int retval = 0;
+ struct yaffs_linux_context *context = yaffs_dev_to_lc(dev);
+
+ if (dev->read_only)
+ return -1;
+
+ context->bg_running = 1;
+
+ context->bg_thread = kthread_run(yaffs_bg_thread_fn,
+ (void *)dev, "yaffs-bg-%d",
+ context->mount_id);
+
+ if (IS_ERR(context->bg_thread)) {
+ retval = PTR_ERR(context->bg_thread);
+ context->bg_thread = NULL;
+ context->bg_running = 0;
+ }
+ return retval;
+}
+
+static void yaffs_bg_stop(struct yaffs_dev *dev)
+{
+ struct yaffs_linux_context *ctxt = yaffs_dev_to_lc(dev);
+
+ ctxt->bg_running = 0;
+
+ if (ctxt->bg_thread) {
+ kthread_stop(ctxt->bg_thread);
+ ctxt->bg_thread = NULL;
+ }
+}
+#else
+static int yaffs_bg_thread_fn(void *data)
+{
+ return 0;
+}
+
+static int yaffs_bg_start(struct yaffs_dev *dev)
+{
+ return 0;
+}
+
+static void yaffs_bg_stop(struct yaffs_dev *dev)
+{
+}
+#endif
+
+
+static void yaffs_flush_inodes(struct super_block *sb)
+{
+ struct inode *iptr;
+ struct yaffs_obj *obj;
+
+ list_for_each_entry(iptr, &sb->s_inodes, i_sb_list) {
+ obj = yaffs_inode_to_obj(iptr);
+ if (obj) {
+ yaffs_trace(YAFFS_TRACE_OS,
+ "flushing obj %d",
+ obj->obj_id);
+ yaffs_flush_file(obj, 1, 0, 0);
+ }
+ }
+}
+
+static void yaffs_flush_super(struct super_block *sb, int do_checkpoint)
+{
+ struct yaffs_dev *dev = yaffs_super_to_dev(sb);
+ if (!dev)
+ return;
+
+ yaffs_flush_inodes(sb);
+ yaffs_update_dirty_dirs(dev);
+ yaffs_flush_whole_cache(dev, 1);
+ if (do_checkpoint)
+ yaffs_checkpoint_save(dev);
+}
+
+static LIST_HEAD(yaffs_context_list);
+struct mutex yaffs_context_lock;
+
+static void yaffs_put_super(struct super_block *sb)
+{
+ struct yaffs_dev *dev = yaffs_super_to_dev(sb);
+ struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
+
+ yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_ALWAYS,
+ "yaffs_put_super");
+
+ yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_BACKGROUND,
+ "Shutting down yaffs background thread");
+ yaffs_bg_stop(dev);
+ yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_BACKGROUND,
+ "yaffs background thread shut down");
+
+ yaffs_gross_lock(dev);
+
+ yaffs_flush_super(sb, 1);
+
+ yaffs_deinitialise(dev);
+
+ yaffs_gross_unlock(dev);
+
+ mutex_lock(&yaffs_context_lock);
+ list_del_init(&(yaffs_dev_to_lc(dev)->context_list));
+ mutex_unlock(&yaffs_context_lock);
+
+ if (yaffs_dev_to_lc(dev)->spare_buffer) {
+ kfree(yaffs_dev_to_lc(dev)->spare_buffer);
+ yaffs_dev_to_lc(dev)->spare_buffer = NULL;
+ }
+
+ kfree(dev);
+
+ yaffs_put_mtd_device(mtd);
+
+ yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_ALWAYS,
+ "yaffs_put_super done");
+}
+
+
+static unsigned yaffs_gc_control_callback(struct yaffs_dev *dev)
+{
+ return yaffs_gc_control;
+}
+
+
+#ifdef YAFFS_COMPILE_EXPORTFS
+
+static struct inode *yaffs2_nfs_get_inode(struct super_block *sb, uint64_t ino,
+ uint32_t generation)
+{
+ return Y_IGET(sb, ino);
+}
+
+static struct dentry *yaffs2_fh_to_dentry(struct super_block *sb,
+ struct fid *fid, int fh_len,
+ int fh_type)
+{
+ return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
+ yaffs2_nfs_get_inode);
+}
+
+static struct dentry *yaffs2_fh_to_parent(struct super_block *sb,
+ struct fid *fid, int fh_len,
+ int fh_type)
+{
+ return generic_fh_to_parent(sb, fid, fh_len, fh_type,
+ yaffs2_nfs_get_inode);
+}
+
+struct dentry *yaffs2_get_parent(struct dentry *dentry)
+{
+
+ struct super_block *sb = dentry->d_inode->i_sb;
+ struct dentry *parent = ERR_PTR(-ENOENT);
+ struct inode *inode;
+ unsigned long parent_ino;
+ struct yaffs_obj *d_obj;
+ struct yaffs_obj *parent_obj;
+
+ d_obj = yaffs_inode_to_obj(dentry->d_inode);
+
+ if (d_obj) {
+ parent_obj = d_obj->parent;
+ if (parent_obj) {
+ parent_ino = yaffs_get_obj_inode(parent_obj);
+ inode = Y_IGET(sb, parent_ino);
+
+ if (IS_ERR(inode)) {
+ parent = ERR_CAST(inode);
+ } else {
+ parent = d_obtain_alias(inode);
+ if (!IS_ERR(parent)) {
+ parent = ERR_PTR(-ENOMEM);
+ iput(inode);
+ }
+ }
+ }
+ }
+
+ return parent;
+}
+
+/* Just declare a zero structure as a NULL value implies
+ * using the default functions of exportfs.
+ */
+
+static struct export_operations yaffs_export_ops = {
+ .fh_to_dentry = yaffs2_fh_to_dentry,
+ .fh_to_parent = yaffs2_fh_to_parent,
+ .get_parent = yaffs2_get_parent,
+};
+
+#endif
+
+static void yaffs_unstitch_obj(struct inode *inode, struct yaffs_obj *obj)
+{
+ /* Clear the association between the inode and
+ * the struct yaffs_obj.
+ */
+ obj->my_inode = NULL;
+ yaffs_inode_to_obj_lv(inode) = NULL;
+
+ /* If the object freeing was deferred, then the real
+ * free happens now.
+ * This should fix the inode inconsistency problem.
+ */
+ yaffs_handle_defered_free(obj);
+}
+
+#ifdef YAFFS_HAS_EVICT_INODE
+/* yaffs_evict_inode combines into one operation what was previously done in
+ * yaffs_clear_inode() and yaffs_delete_inode()
+ *
+ */
+static void yaffs_evict_inode(struct inode *inode)
+{
+ struct yaffs_obj *obj;
+ struct yaffs_dev *dev;
+ int deleteme = 0;
+
+ obj = yaffs_inode_to_obj(inode);
+
+ yaffs_trace(YAFFS_TRACE_OS,
+ "yaffs_evict_inode: ino %d, count %d %s",
+ (int)inode->i_ino, atomic_read(&inode->i_count),
+ obj ? "object exists" : "null object");
+
+ if (!inode->i_nlink && !is_bad_inode(inode))
+ deleteme = 1;
+ truncate_inode_pages(&inode->i_data, 0);
+ Y_CLEAR_INODE(inode);
+
+ if (deleteme && obj) {
+ dev = obj->my_dev;
+ yaffs_gross_lock(dev);
+ yaffs_del_obj(obj);
+ yaffs_gross_unlock(dev);
+ }
+ if (obj) {
+ dev = obj->my_dev;
+ yaffs_gross_lock(dev);
+ yaffs_unstitch_obj(inode, obj);
+ yaffs_gross_unlock(dev);
+ }
+}
+#else
+
+/* clear is called to tell the fs to release any per-inode data it holds.
+ * The object might still exist on disk and is just being thrown out of the cache
+ * or else the object has actually been deleted and we're being called via
+ * the chain
+ * yaffs_delete_inode() -> clear_inode()->yaffs_clear_inode()
+ */
+
+static void yaffs_clear_inode(struct inode *inode)
+{
+ struct yaffs_obj *obj;
+ struct yaffs_dev *dev;
+
+ obj = yaffs_inode_to_obj(inode);
+
+ yaffs_trace(YAFFS_TRACE_OS,
+ "yaffs_clear_inode: ino %d, count %d %s",
+ (int)inode->i_ino, atomic_read(&inode->i_count),
+ obj ? "object exists" : "null object");
+
+ if (obj) {
+ dev = obj->my_dev;
+ yaffs_gross_lock(dev);
+ yaffs_unstitch_obj(inode, obj);
+ yaffs_gross_unlock(dev);
+ }
+
+}
+
+/* delete is called when the link count is zero and the inode
+ * is put (ie. nobody wants to know about it anymore, time to
+ * delete the file).
+ * NB Must call clear_inode()
+ */
+static void yaffs_delete_inode(struct inode *inode)
+{
+ struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
+ struct yaffs_dev *dev;
+
+ yaffs_trace(YAFFS_TRACE_OS,
+ "yaffs_delete_inode: ino %d, count %d %s",
+ (int)inode->i_ino, atomic_read(&inode->i_count),
+ obj ? "object exists" : "null object");
+
+ if (obj) {
+ dev = obj->my_dev;
+ yaffs_gross_lock(dev);
+ yaffs_del_obj(obj);
+ yaffs_gross_unlock(dev);
+ }
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 13))
+ truncate_inode_pages(&inode->i_data, 0);
+#endif
+ clear_inode(inode);
+}
+#endif
+
+
+
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
+static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf)
+{
+ struct yaffs_dev *dev = yaffs_dentry_to_obj(dentry)->my_dev;
+ struct super_block *sb = dentry->d_sb;
+#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf)
+{
+ struct yaffs_dev *dev = yaffs_super_to_dev(sb);
+#else
+static int yaffs_statfs(struct super_block *sb, struct statfs *buf)
+{
+ struct yaffs_dev *dev = yaffs_super_to_dev(sb);
+#endif
+
+ yaffs_trace(YAFFS_TRACE_OS, "yaffs_statfs");
+
+ yaffs_gross_lock(dev);
+
+ buf->f_type = YAFFS_MAGIC;
+ buf->f_bsize = sb->s_blocksize;
+ buf->f_namelen = 255;
+
+ if (dev->data_bytes_per_chunk & (dev->data_bytes_per_chunk - 1)) {
+ /* Do this if chunk size is not a power of 2 */
+
+ uint64_t bytes_in_dev;
+ uint64_t bytes_free;
+
+ bytes_in_dev =
+ ((uint64_t)
+ ((dev->param.end_block - dev->param.start_block +
+ 1))) * ((uint64_t) (dev->param.chunks_per_block *
+ dev->data_bytes_per_chunk));
+
+ do_div(bytes_in_dev, sb->s_blocksize); /* bytes_in_dev becomes the number of blocks */
+ buf->f_blocks = bytes_in_dev;
+
+ bytes_free = ((uint64_t) (yaffs_get_n_free_chunks(dev))) *
+ ((uint64_t) (dev->data_bytes_per_chunk));
+
+ do_div(bytes_free, sb->s_blocksize);
+
+ buf->f_bfree = bytes_free;
+
+ } else if (sb->s_blocksize > dev->data_bytes_per_chunk) {
+
+ buf->f_blocks =
+ (dev->param.end_block - dev->param.start_block + 1) *
+ dev->param.chunks_per_block /
+ (sb->s_blocksize / dev->data_bytes_per_chunk);
+ buf->f_bfree =
+ yaffs_get_n_free_chunks(dev) /
+ (sb->s_blocksize / dev->data_bytes_per_chunk);
+ } else {
+ buf->f_blocks =
+ (dev->param.end_block - dev->param.start_block + 1) *
+ dev->param.chunks_per_block *
+ (dev->data_bytes_per_chunk / sb->s_blocksize);
+
+ buf->f_bfree =
+ yaffs_get_n_free_chunks(dev) *
+ (dev->data_bytes_per_chunk / sb->s_blocksize);
+ }
+
+ buf->f_files = 0;
+ buf->f_ffree = 0;
+ buf->f_bavail = buf->f_bfree;
+
+ yaffs_gross_unlock(dev);
+ return 0;
+}
+
+
+
+static int yaffs_do_sync_fs(struct super_block *sb, int request_checkpoint)
+{
+
+ struct yaffs_dev *dev = yaffs_super_to_dev(sb);
+ unsigned int oneshot_checkpoint = (yaffs_auto_checkpoint & 4);
+ unsigned gc_urgent = yaffs_bg_gc_urgency(dev);
+ int do_checkpoint;
+ int dirty = yaffs_check_super_dirty(dev);
+
+ yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC | YAFFS_TRACE_BACKGROUND,
+ "yaffs_do_sync_fs: gc-urgency %d %s %s%s",
+ gc_urgent,
+ dirty ? "dirty" : "clean",
+ request_checkpoint ? "checkpoint requested" : "no checkpoint",
+ oneshot_checkpoint ? " one-shot" : "");
+
+ yaffs_gross_lock(dev);
+ do_checkpoint = ((request_checkpoint && !gc_urgent) ||
+ oneshot_checkpoint) && !dev->is_checkpointed;
+
+ if (dirty || do_checkpoint) {
+ yaffs_flush_super(sb, !dev->is_checkpointed && do_checkpoint);
+ yaffs_clear_super_dirty(dev);
+ if (oneshot_checkpoint)
+ yaffs_auto_checkpoint &= ~4;
+ }
+ yaffs_gross_unlock(dev);
+
+ return 0;
+}
+
+
+#ifdef YAFFS_HAS_WRITE_SUPER
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
+static void yaffs_write_super(struct super_block *sb)
+#else
+static int yaffs_write_super(struct super_block *sb)
+#endif
+{
+ unsigned request_checkpoint = (yaffs_auto_checkpoint >= 2);
+
+ yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC | YAFFS_TRACE_BACKGROUND,
+ "yaffs_write_super %s",
+ request_checkpoint ? " checkpt" : "");
+
+ yaffs_do_sync_fs(sb, request_checkpoint);
+
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 18))
+ return 0;
+#endif
+}
+#endif
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
+static int yaffs_sync_fs(struct super_block *sb, int wait)
+#else
+static int yaffs_sync_fs(struct super_block *sb)
+#endif
+{
+ unsigned request_checkpoint = (yaffs_auto_checkpoint >= 1);
+
+ yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC,
+ "yaffs_sync_fs%s", request_checkpoint ? " checkpt" : "");
+
+ yaffs_do_sync_fs(sb, request_checkpoint);
+
+ return 0;
+}
+
+/* the function only is used to change dev->read_only when this file system
+ * is remounted.
+ */
+static int yaffs_remount_fs(struct super_block *sb, int *flags, char *data)
+{
+ int read_only = 0;
+ struct mtd_info *mtd;
+ struct yaffs_dev *dev = 0;
+
+ /* Get the device */
+ mtd = get_mtd_device(NULL, MINOR(sb->s_dev));
+ if (!mtd) {
+ yaffs_trace(YAFFS_TRACE_ALWAYS,
+ "MTD device #%u doesn't appear to exist",
+ MINOR(sb->s_dev));
+ return 1;
+ }
+
+ /* Check it's NAND */
+ if (mtd->type != MTD_NANDFLASH) {
+ yaffs_trace(YAFFS_TRACE_ALWAYS,
+ "MTD device is not NAND it's type %d",
+ mtd->type);
+ return 1;
+ }
+
+ read_only = ((*flags & MS_RDONLY) != 0);
+ if (!read_only && !(mtd->flags & MTD_WRITEABLE)) {
+ read_only = 1;
+ printk(KERN_INFO
+ "yaffs: mtd is read only, setting superblock read only");
+ *flags |= MS_RDONLY;
+ }
+
+ dev = sb->s_fs_info;
+ dev->read_only = read_only;
+
+ return 0;
+}
+
+static const struct super_operations yaffs_super_ops = {
+ .statfs = yaffs_statfs,
+
+#ifndef YAFFS_USE_OWN_IGET
+ .read_inode = yaffs_read_inode,
+#endif
+#ifdef YAFFS_HAS_PUT_INODE
+ .put_inode = yaffs_put_inode,
+#endif
+ .put_super = yaffs_put_super,
+#ifdef YAFFS_HAS_EVICT_INODE
+ .evict_inode = yaffs_evict_inode,
+#else
+ .delete_inode = yaffs_delete_inode,
+ .clear_inode = yaffs_clear_inode,
+#endif
+ .sync_fs = yaffs_sync_fs,
+#ifdef YAFFS_HAS_WRITE_SUPER
+ .write_super = yaffs_write_super,
+#endif
+ .remount_fs = yaffs_remount_fs,
+};
+
+struct yaffs_options {
+ int inband_tags;
+ int skip_checkpoint_read;
+ int skip_checkpoint_write;
+ int no_cache;
+ int tags_ecc_on;
+ int tags_ecc_overridden;
+ int lazy_loading_enabled;
+ int lazy_loading_overridden;
+ int empty_lost_and_found;
+ int empty_lost_and_found_overridden;
+ int disable_summary;
+};
+
+#define MAX_OPT_LEN 30
+static int yaffs_parse_options(struct yaffs_options *options,
+ const char *options_str)
+{
+ char cur_opt[MAX_OPT_LEN + 1];
+ int p;
+ int error = 0;
+
+ /* Parse through the options which is a comma seperated list */
+
+ while (options_str && *options_str && !error) {
+ memset(cur_opt, 0, MAX_OPT_LEN + 1);
+ p = 0;
+
+ while (*options_str == ',')
+ options_str++;
+
+ while (*options_str && *options_str != ',') {
+ if (p < MAX_OPT_LEN) {
+ cur_opt[p] = *options_str;
+ p++;
+ }
+ options_str++;
+ }
+
+ if (!strcmp(cur_opt, "inband-tags")) {
+ options->inband_tags = 1;
+ } else if (!strcmp(cur_opt, "tags-ecc-off")) {
+ options->tags_ecc_on = 0;
+ options->tags_ecc_overridden = 1;
+ } else if (!strcmp(cur_opt, "tags-ecc-on")) {
+ options->tags_ecc_on = 1;
+ options->tags_ecc_overridden = 1;
+ } else if (!strcmp(cur_opt, "lazy-loading-off")) {
+ options->lazy_loading_enabled = 0;
+ options->lazy_loading_overridden = 1;
+ } else if (!strcmp(cur_opt, "lazy-loading-on")) {
+ options->lazy_loading_enabled = 1;
+ options->lazy_loading_overridden = 1;
+ } else if (!strcmp(cur_opt, "disable-summary")) {
+ options->disable_summary = 1;
+ } else if (!strcmp(cur_opt, "empty-lost-and-found-off")) {
+ options->empty_lost_and_found = 0;
+ options->empty_lost_and_found_overridden = 1;
+ } else if (!strcmp(cur_opt, "empty-lost-and-found-on")) {
+ options->empty_lost_and_found = 1;
+ options->empty_lost_and_found_overridden = 1;
+ } else if (!strcmp(cur_opt, "no-cache")) {
+ options->no_cache = 1;
+ } else if (!strcmp(cur_opt, "no-checkpoint-read")) {
+ options->skip_checkpoint_read = 1;
+ } else if (!strcmp(cur_opt, "no-checkpoint-write")) {
+ options->skip_checkpoint_write = 1;
+ } else if (!strcmp(cur_opt, "no-checkpoint")) {
+ options->skip_checkpoint_read = 1;
+ options->skip_checkpoint_write = 1;
+ } else {
+ printk(KERN_INFO "yaffs: Bad mount option \"%s\"\n",
+ cur_opt);
+ error = 1;
+ }
+ }
+
+ return error;
+}
+
+
+static struct dentry *yaffs_make_root(struct inode *inode)
+{
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 4, 0))
+ struct dentry *root = d_alloc_root(inode);
+
+ if (!root)
+ iput(inode);
+
+ return root;
+#else
+ return d_make_root(inode);
+#endif
+}
+
+
+
+
+static struct super_block *yaffs_internal_read_super(int yaffs_version,
+ struct super_block *sb,
+ void *data, int silent)
+{
+ int n_blocks;
+ struct inode *inode = NULL;
+ struct dentry *root;
+ struct yaffs_dev *dev = 0;
+ char devname_buf[BDEVNAME_SIZE + 1];
+ struct mtd_info *mtd;
+ int err;
+ char *data_str = (char *)data;
+ struct yaffs_linux_context *context = NULL;
+ struct yaffs_param *param;
+
+ int read_only = 0;
+ int inband_tags = 0;
+
+ struct yaffs_options options;
+
+ unsigned mount_id;
+ int found;
+ struct yaffs_linux_context *context_iterator;
+ struct list_head *l;
+
+ if (!sb) {
+ printk(KERN_INFO "yaffs: sb is NULL\n");
+ return NULL;
+ }
+
+ sb->s_magic = YAFFS_MAGIC;
+ sb->s_op = &yaffs_super_ops;
+ sb->s_flags |= MS_NOATIME;
+
+ read_only = ((sb->s_flags & MS_RDONLY) != 0);
+
+#ifdef YAFFS_COMPILE_EXPORTFS
+ sb->s_export_op = &yaffs_export_ops;
+#endif
+
+ if (!sb->s_dev)
+ printk(KERN_INFO "yaffs: sb->s_dev is NULL\n");
+ else if (!yaffs_devname(sb, devname_buf))
+ printk(KERN_INFO "yaffs: devname is NULL\n");
+ else
+ printk(KERN_INFO "yaffs: dev is %d name is \"%s\" %s\n",
+ sb->s_dev,
+ yaffs_devname(sb, devname_buf), read_only ? "ro" : "rw");
+
+ if (!data_str)
+ data_str = "";
+
+ printk(KERN_INFO "yaffs: passed flags \"%s\"\n", data_str);
+
+ memset(&options, 0, sizeof(options));
+
+ if (yaffs_parse_options(&options, data_str)) {
+ /* Option parsing failed */
+ return NULL;
+ }
+
+ sb->s_blocksize = PAGE_CACHE_SIZE;
+ sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
+
+ yaffs_trace(YAFFS_TRACE_OS,
+ "yaffs_read_super: Using yaffs%d", yaffs_version);
+ yaffs_trace(YAFFS_TRACE_OS,
+ "yaffs_read_super: block size %d", (int)(sb->s_blocksize));
+
+ yaffs_trace(YAFFS_TRACE_ALWAYS,
+ "yaffs: Attempting MTD mount of %u.%u,\"%s\"",
+ MAJOR(sb->s_dev), MINOR(sb->s_dev),
+ yaffs_devname(sb, devname_buf));
+
+ /* Get the device */
+ mtd = get_mtd_device(NULL, MINOR(sb->s_dev));
+ if (IS_ERR(mtd)) {
+ yaffs_trace(YAFFS_TRACE_ALWAYS,
+ "yaffs: MTD device %u either not valid or unavailable",
+ MINOR(sb->s_dev));
+ return NULL;
+ }
+
+ if (yaffs_auto_select && yaffs_version == 1 && WRITE_SIZE(mtd) >= 2048) {
+ yaffs_trace(YAFFS_TRACE_ALWAYS, "auto selecting yaffs2");
+ yaffs_version = 2;
+ }
+
+ /* Added NCB 26/5/2006 for completeness */
+ if (yaffs_version == 2 && !options.inband_tags
+ && WRITE_SIZE(mtd) == 512) {
+ yaffs_trace(YAFFS_TRACE_ALWAYS, "auto selecting yaffs1");
+ yaffs_version = 1;
+ }
+
+ if (mtd->oobavail < sizeof(struct yaffs_packed_tags2) ||
+ options.inband_tags)
+ inband_tags = 1;
+
+ if(yaffs_verify_mtd(mtd, yaffs_version, inband_tags) < 0)
+ return NULL;
+
+ /* OK, so if we got here, we have an MTD that's NAND and looks
+ * like it has the right capabilities
+ * Set the struct yaffs_dev up for mtd
+ */
+
+ if (!read_only && !(mtd->flags & MTD_WRITEABLE)) {
+ read_only = 1;
+ printk(KERN_INFO
+ "yaffs: mtd is read only, setting superblock read only\n"
+ );
+ sb->s_flags |= MS_RDONLY;
+ }
+
+ dev = kmalloc(sizeof(struct yaffs_dev), GFP_KERNEL);
+ context = kmalloc(sizeof(struct yaffs_linux_context), GFP_KERNEL);
+
+ if (!dev || !context) {
+ kfree(dev);
+ kfree(context);
+ dev = NULL;
+ context = NULL;
+
+ /* Deep shit could not allocate device structure */
+ yaffs_trace(YAFFS_TRACE_ALWAYS,
+ "yaffs_read_super: Failed trying to allocate struct yaffs_dev."
+ );
+ return NULL;
+ }
+ memset(dev, 0, sizeof(struct yaffs_dev));
+ param = &(dev->param);
+
+ memset(context, 0, sizeof(struct yaffs_linux_context));
+ dev->os_context = context;
+ INIT_LIST_HEAD(&(context->context_list));
+ context->dev = dev;
+ context->super = sb;
+
+ dev->read_only = read_only;
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+ sb->s_fs_info = dev;
+#else
+ sb->u.generic_sbp = dev;
+#endif
+
+
+ dev->driver_context = mtd;
+ param->name = mtd->name;
+
+ /* Set up the memory size parameters.... */
+
+
+ param->n_reserved_blocks = 5;
+ param->n_caches = (options.no_cache) ? 0 : 10;
+ param->inband_tags = inband_tags;
+
+ param->enable_xattr = 1;
+ if (options.lazy_loading_overridden)
+ param->disable_lazy_load = !options.lazy_loading_enabled;
+
+ param->defered_dir_update = 1;
+
+ if (options.tags_ecc_overridden)
+ param->no_tags_ecc = !options.tags_ecc_on;
+
+ param->empty_lost_n_found = 1;
+ param->refresh_period = 500;
+ param->disable_summary = options.disable_summary;
+
+
+#ifdef CONFIG_YAFFS_DISABLE_BAD_BLOCK_MARKING
+ param->disable_bad_block_marking = 1;
+#endif
+ if (options.empty_lost_and_found_overridden)
+ param->empty_lost_n_found = options.empty_lost_and_found;
+
+ /* ... and the functions. */
+ if (yaffs_version == 2) {
+ param->is_yaffs2 = 1;
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
+ param->total_bytes_per_chunk = mtd->writesize;
+ param->chunks_per_block = mtd->erasesize / mtd->writesize;
+#else
+ param->total_bytes_per_chunk = mtd->oobblock;
+ param->chunks_per_block = mtd->erasesize / mtd->oobblock;
+#endif
+ n_blocks = YCALCBLOCKS(mtd->size, mtd->erasesize);
+
+ param->start_block = 0;
+ param->end_block = n_blocks - 1;
+ } else {
+ param->is_yaffs2 = 0;
+ n_blocks = YCALCBLOCKS(mtd->size,
+ YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK);
+
+ param->chunks_per_block = YAFFS_CHUNKS_PER_BLOCK;
+ param->total_bytes_per_chunk = YAFFS_BYTES_PER_CHUNK;
+ }
+
+ param->start_block = 0;
+ param->end_block = n_blocks - 1;
+
+ yaffs_mtd_drv_install(dev);
+
+ param->sb_dirty_fn = yaffs_set_super_dirty;
+ param->gc_control_fn = yaffs_gc_control_callback;
+
+ yaffs_dev_to_lc(dev)->super = sb;
+
+ param->use_nand_ecc = 1;
+
+ param->skip_checkpt_rd = options.skip_checkpoint_read;
+ param->skip_checkpt_wr = options.skip_checkpoint_write;
+
+ mutex_lock(&yaffs_context_lock);
+ /* Get a mount id */
+ found = 0;
+ for (mount_id = 0; !found; mount_id++) {
+ found = 1;
+ list_for_each(l, &yaffs_context_list) {
+ context_iterator =
+ list_entry(l, struct yaffs_linux_context,
+ context_list);
+ if (context_iterator->mount_id == mount_id)
+ found = 0;
+ }
+ }
+ context->mount_id = mount_id;
+
+ list_add_tail(&(yaffs_dev_to_lc(dev)->context_list),
+ &yaffs_context_list);
+ mutex_unlock(&yaffs_context_lock);
+
+ /* Directory search handling... */
+ INIT_LIST_HEAD(&(yaffs_dev_to_lc(dev)->search_contexts));
+ param->remove_obj_fn = yaffs_remove_obj_callback;
+
+ mutex_init(&(yaffs_dev_to_lc(dev)->gross_lock));
+
+ yaffs_gross_lock(dev);
+
+ err = yaffs_guts_initialise(dev);
+
+ yaffs_trace(YAFFS_TRACE_OS,
+ "yaffs_read_super: guts initialised %s",
+ (err == YAFFS_OK) ? "OK" : "FAILED");
+
+ if (err == YAFFS_OK)
+ yaffs_bg_start(dev);
+
+ if (!context->bg_thread)
+ param->defered_dir_update = 0;
+
+ sb->s_maxbytes = yaffs_max_file_size(dev);
+
+ /* Release lock before yaffs_get_inode() */
+ yaffs_gross_unlock(dev);
+
+ /* Create root inode */
+ if (err == YAFFS_OK)
+ inode = yaffs_get_inode(sb, S_IFDIR | 0755, 0, yaffs_root(dev));
+
+ if (!inode)
+ return NULL;
+
+ inode->i_op = &yaffs_dir_inode_operations;
+ inode->i_fop = &yaffs_dir_operations;
+
+ yaffs_trace(YAFFS_TRACE_OS, "yaffs_read_super: got root inode");
+
+ root = yaffs_make_root(inode);
+
+ if (!root)
+ return NULL;
+
+ sb->s_root = root;
+ if(!dev->is_checkpointed)
+ yaffs_set_super_dirty(dev);
+
+ yaffs_trace(YAFFS_TRACE_ALWAYS,
+ "yaffs_read_super: is_checkpointed %d",
+ dev->is_checkpointed);
+
+ yaffs_trace(YAFFS_TRACE_OS, "yaffs_read_super: done");
+ return sb;
+}
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+static int yaffs_internal_read_super_mtd(struct super_block *sb, void *data,
+ int silent)
+{
+ return yaffs_internal_read_super(1, sb, data, silent) ? 0 : -EINVAL;
+}
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 39))
+static struct dentry *yaffs_mount(struct file_system_type *fs_type, int flags,
+ const char *dev_name, void *data)
+{
+ return mount_bdev(fs_type, flags, dev_name, data, yaffs_internal_read_super_mtd);
+}
+#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
+static int yaffs_read_super(struct file_system_type *fs,
+ int flags, const char *dev_name,
+ void *data, struct vfsmount *mnt)
+{
+
+ return get_sb_bdev(fs, flags, dev_name, data,
+ yaffs_internal_read_super_mtd, mnt);
+}
+#else
+static struct super_block *yaffs_read_super(struct file_system_type *fs,
+ int flags, const char *dev_name,
+ void *data)
+{
+
+ return get_sb_bdev(fs, flags, dev_name, data,
+ yaffs_internal_read_super_mtd);
+}
+#endif
+
+static struct file_system_type yaffs_fs_type = {
+ .owner = THIS_MODULE,
+ .name = "yaffs",
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 39))
+ .mount = yaffs_mount,
+#else
+ .get_sb = yaffs_read_super,
+#endif
+ .kill_sb = kill_block_super,
+ .fs_flags = FS_REQUIRES_DEV,
+};
+#else
+static struct super_block *yaffs_read_super(struct super_block *sb, void *data,
+ int silent)
+{
+ return yaffs_internal_read_super(1, sb, data, silent);
+}
+
+static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super,
+ FS_REQUIRES_DEV);
+#endif
+
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+static int yaffs2_internal_read_super_mtd(struct super_block *sb, void *data,
+ int silent)
+{
+ return yaffs_internal_read_super(2, sb, data, silent) ? 0 : -EINVAL;
+}
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 39))
+static struct dentry *yaffs2_mount(struct file_system_type *fs_type, int flags,
+ const char *dev_name, void *data)
+{
+ return mount_bdev(fs_type, flags, dev_name, data, yaffs2_internal_read_super_mtd);
+}
+#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
+static int yaffs2_read_super(struct file_system_type *fs,
+ int flags, const char *dev_name, void *data,
+ struct vfsmount *mnt)
+{
+ return get_sb_bdev(fs, flags, dev_name, data,
+ yaffs2_internal_read_super_mtd, mnt);
+}
+#else
+static struct super_block *yaffs2_read_super(struct file_system_type *fs,
+ int flags, const char *dev_name,
+ void *data)
+{
+
+ return get_sb_bdev(fs, flags, dev_name, data,
+ yaffs2_internal_read_super_mtd);
+}
+#endif
+
+static struct file_system_type yaffs2_fs_type = {
+ .owner = THIS_MODULE,
+ .name = "yaffs2",
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 39))
+ .mount = yaffs2_mount,
+#else
+ .get_sb = yaffs2_read_super,
+#endif
+ .kill_sb = kill_block_super,
+ .fs_flags = FS_REQUIRES_DEV,
+};
+#else
+static struct super_block *yaffs2_read_super(struct super_block *sb,
+ void *data, int silent)
+{
+ return yaffs_internal_read_super(2, sb, data, silent);
+}
+
+static DECLARE_FSTYPE(yaffs2_fs_type, "yaffs2", yaffs2_read_super,
+ FS_REQUIRES_DEV);
+#endif
+
+
+static struct proc_dir_entry *my_proc_entry;
+
+static char *yaffs_dump_dev_part0(char *buf, struct yaffs_dev *dev)
+{
+ struct yaffs_param *param = &dev->param;
+ int bs[10];
+
+ yaffs_count_blocks_by_state(dev,bs);
+
+ buf += sprintf(buf, "start_block.......... %d\n", param->start_block);
+ buf += sprintf(buf, "end_block............ %d\n", param->end_block);
+ buf += sprintf(buf, "total_bytes_per_chunk %d\n",
+ param->total_bytes_per_chunk);
+ buf += sprintf(buf, "use_nand_ecc......... %d\n", param->use_nand_ecc);
+ buf += sprintf(buf, "no_tags_ecc.......... %d\n", param->no_tags_ecc);
+ buf += sprintf(buf, "is_yaffs2............ %d\n", param->is_yaffs2);
+ buf += sprintf(buf, "inband_tags.......... %d\n", param->inband_tags);
+ buf += sprintf(buf, "empty_lost_n_found... %d\n",
+ param->empty_lost_n_found);
+ buf += sprintf(buf, "disable_lazy_load.... %d\n",
+ param->disable_lazy_load);
+ buf += sprintf(buf, "disable_bad_block_mrk %d\n",
+ param->disable_bad_block_marking);
+ buf += sprintf(buf, "refresh_period....... %d\n",
+ param->refresh_period);
+ buf += sprintf(buf, "n_caches............. %d\n", param->n_caches);
+ buf += sprintf(buf, "n_reserved_blocks.... %d\n",
+ param->n_reserved_blocks);
+ buf += sprintf(buf, "always_check_erased.. %d\n",
+ param->always_check_erased);
+ buf += sprintf(buf, "\n");
+ buf += sprintf(buf, "block count by state\n");
+ buf += sprintf(buf, "0:%d 1:%d 2:%d 3:%d 4:%d\n",
+ bs[0], bs[1], bs[2], bs[3], bs[4]);
+ buf += sprintf(buf, "5:%d 6:%d 7:%d 8:%d 9:%d\n",
+ bs[5], bs[6], bs[7], bs[8], bs[9]);
+
+ return buf;
+}
+
+static char *yaffs_dump_dev_part1(char *buf, struct yaffs_dev *dev)
+{
+ buf += sprintf(buf, "max file size....... %lld\n",
+ (long long) yaffs_max_file_size(dev));
+ buf += sprintf(buf, "data_bytes_per_chunk. %d\n",
+ dev->data_bytes_per_chunk);
+ buf += sprintf(buf, "chunk_grp_bits....... %d\n", dev->chunk_grp_bits);
+ buf += sprintf(buf, "chunk_grp_size....... %d\n", dev->chunk_grp_size);
+ buf += sprintf(buf, "n_erased_blocks...... %d\n", dev->n_erased_blocks);
+ buf += sprintf(buf, "blocks_in_checkpt.... %d\n",
+ dev->blocks_in_checkpt);
+ buf += sprintf(buf, "\n");
+ buf += sprintf(buf, "n_tnodes............. %d\n", dev->n_tnodes);
+ buf += sprintf(buf, "n_obj................ %d\n", dev->n_obj);
+ buf += sprintf(buf, "n_free_chunks........ %d\n", dev->n_free_chunks);
+ buf += sprintf(buf, "\n");
+ buf += sprintf(buf, "n_page_writes........ %u\n", dev->n_page_writes);
+ buf += sprintf(buf, "n_page_reads......... %u\n", dev->n_page_reads);
+ buf += sprintf(buf, "n_erasures........... %u\n", dev->n_erasures);
+ buf += sprintf(buf, "n_gc_copies.......... %u\n", dev->n_gc_copies);
+ buf += sprintf(buf, "all_gcs.............. %u\n", dev->all_gcs);
+ buf += sprintf(buf, "passive_gc_count..... %u\n",
+ dev->passive_gc_count);
+ buf += sprintf(buf, "oldest_dirty_gc_count %u\n",
+ dev->oldest_dirty_gc_count);
+ buf += sprintf(buf, "n_gc_blocks.......... %u\n", dev->n_gc_blocks);
+ buf += sprintf(buf, "bg_gcs............... %u\n", dev->bg_gcs);
+ buf += sprintf(buf, "n_retried_writes..... %u\n",
+ dev->n_retried_writes);
+ buf += sprintf(buf, "n_retired_blocks..... %u\n",
+ dev->n_retired_blocks);
+ buf += sprintf(buf, "n_ecc_fixed.......... %u\n", dev->n_ecc_fixed);
+ buf += sprintf(buf, "n_ecc_unfixed........ %u\n", dev->n_ecc_unfixed);
+ buf += sprintf(buf, "n_tags_ecc_fixed..... %u\n",
+ dev->n_tags_ecc_fixed);
+ buf += sprintf(buf, "n_tags_ecc_unfixed... %u\n",
+ dev->n_tags_ecc_unfixed);
+ buf += sprintf(buf, "cache_hits........... %u\n", dev->cache_hits);
+ buf += sprintf(buf, "n_deleted_files...... %u\n", dev->n_deleted_files);
+ buf += sprintf(buf, "n_unlinked_files..... %u\n",
+ dev->n_unlinked_files);
+ buf += sprintf(buf, "refresh_count........ %u\n", dev->refresh_count);
+ buf += sprintf(buf, "n_bg_deletions....... %u\n", dev->n_bg_deletions);
+ buf += sprintf(buf, "tags_used............ %u\n", dev->tags_used);
+ buf += sprintf(buf, "summary_used......... %u\n", dev->summary_used);
+
+ return buf;
+}
+
+static int yaffs_proc_read(char *page,
+ char **start,
+ off_t offset, int count, int *eof, void *data)
+{
+ struct list_head *item;
+ char *buf = page;
+ int step = offset;
+ int n = 0;
+
+ /* Get proc_file_read() to step 'offset' by one on each sucessive call.
+ * We use 'offset' (*ppos) to indicate where we are in dev_list.
+ * This also assumes the user has posted a read buffer large
+ * enough to hold the complete output; but that's life in /proc.
+ */
+
+ *(int *)start = 1;
+
+ /* Print header first */
+ if (step == 0)
+ buf +=
+ sprintf(buf, "Multi-version YAFFS\n");
+ else if (step == 1)
+ buf += sprintf(buf, "\n");
+ else {
+ step -= 2;
+
+ mutex_lock(&yaffs_context_lock);
+
+ /* Locate and print the Nth entry. Order N-squared but N is small. */
+ list_for_each(item, &yaffs_context_list) {
+ struct yaffs_linux_context *dc =
+ list_entry(item, struct yaffs_linux_context,
+ context_list);
+ struct yaffs_dev *dev = dc->dev;
+
+ if (n < (step & ~1)) {
+ n += 2;
+ continue;
+ }
+ if ((step & 1) == 0) {
+ buf +=
+ sprintf(buf, "\nDevice %d \"%s\"\n", n,
+ dev->param.name);
+ buf = yaffs_dump_dev_part0(buf, dev);
+ } else {
+ buf = yaffs_dump_dev_part1(buf, dev);
+ }
+
+ break;
+ }
+ mutex_unlock(&yaffs_context_lock);
+ }
+
+ return buf - page < count ? buf - page : count;
+}
+
+/**
+ * Set the verbosity of the warnings and error messages.
+ *
+ * Note that the names can only be a..z or _ with the current code.
+ */
+
+static struct {
+ char *mask_name;
+ unsigned mask_bitfield;
+} mask_flags[] = {
+ {"allocate", YAFFS_TRACE_ALLOCATE},
+ {"always", YAFFS_TRACE_ALWAYS},
+ {"background", YAFFS_TRACE_BACKGROUND},
+ {"bad_blocks", YAFFS_TRACE_BAD_BLOCKS},
+ {"buffers", YAFFS_TRACE_BUFFERS},
+ {"bug", YAFFS_TRACE_BUG},
+ {"checkpt", YAFFS_TRACE_CHECKPOINT},
+ {"deletion", YAFFS_TRACE_DELETION},
+ {"erase", YAFFS_TRACE_ERASE},
+ {"error", YAFFS_TRACE_ERROR},
+ {"gc_detail", YAFFS_TRACE_GC_DETAIL},
+ {"gc", YAFFS_TRACE_GC},
+ {"lock", YAFFS_TRACE_LOCK},
+ {"mtd", YAFFS_TRACE_MTD},
+ {"nandaccess", YAFFS_TRACE_NANDACCESS},
+ {"os", YAFFS_TRACE_OS},
+ {"scan_debug", YAFFS_TRACE_SCAN_DEBUG},
+ {"scan", YAFFS_TRACE_SCAN},
+ {"mount", YAFFS_TRACE_MOUNT},
+ {"tracing", YAFFS_TRACE_TRACING},
+ {"sync", YAFFS_TRACE_SYNC},
+ {"write", YAFFS_TRACE_WRITE},
+ {"verify", YAFFS_TRACE_VERIFY},
+ {"verify_nand", YAFFS_TRACE_VERIFY_NAND},
+ {"verify_full", YAFFS_TRACE_VERIFY_FULL},
+ {"verify_all", YAFFS_TRACE_VERIFY_ALL},
+ {"all", 0xffffffff},
+ {"none", 0},
+ {NULL, 0},
+};
+
+#define MAX_MASK_NAME_LENGTH 40
+static int yaffs_proc_write_trace_options(struct file *file, const char *buf,
+ unsigned long count)
+{
+ unsigned rg = 0, mask_bitfield;
+ char *end;
+ char *mask_name;
+ const char *x;
+ char substring[MAX_MASK_NAME_LENGTH + 1];
+ int i;
+ int done = 0;
+ int add, len = 0;
+ int pos = 0;
+
+ rg = yaffs_trace_mask;
+
+ while (!done && (pos < count)) {
+ done = 1;
+ while ((pos < count) && isspace(buf[pos]))
+ pos++;
+
+ switch (buf[pos]) {
+ case '+':
+ case '-':
+ case '=':
+ add = buf[pos];
+ pos++;
+ break;
+
+ default:
+ add = ' ';
+ break;
+ }
+ mask_name = NULL;
+
+ mask_bitfield = simple_strtoul(buf + pos, &end, 0);
+
+ if (end > buf + pos) {
+ mask_name = "numeral";
+ len = end - (buf + pos);
+ pos += len;
+ done = 0;
+ } else {
+ for (x = buf + pos, i = 0;
+ (*x == '_' || (*x >= 'a' && *x <= 'z')) &&
+ i < MAX_MASK_NAME_LENGTH; x++, i++, pos++)
+ substring[i] = *x;
+ substring[i] = '\0';
+
+ for (i = 0; mask_flags[i].mask_name != NULL; i++) {
+ if (strcmp(substring, mask_flags[i].mask_name)
+ == 0) {
+ mask_name = mask_flags[i].mask_name;
+ mask_bitfield =
+ mask_flags[i].mask_bitfield;
+ done = 0;
+ break;
+ }
+ }
+ }
+
+ if (mask_name != NULL) {
+ done = 0;
+ switch (add) {
+ case '-':
+ rg &= ~mask_bitfield;
+ break;
+ case '+':
+ rg |= mask_bitfield;
+ break;
+ case '=':
+ rg = mask_bitfield;
+ break;
+ default:
+ rg |= mask_bitfield;
+ break;
+ }
+ }
+ }
+
+ yaffs_trace_mask = rg | YAFFS_TRACE_ALWAYS;
+
+ printk(KERN_DEBUG "new trace = 0x%08X\n", yaffs_trace_mask);
+
+ if (rg & YAFFS_TRACE_ALWAYS) {
+ for (i = 0; mask_flags[i].mask_name != NULL; i++) {
+ char flag;
+ flag = ((rg & mask_flags[i].mask_bitfield) ==
+ mask_flags[i].mask_bitfield) ? '+' : '-';
+ printk(KERN_DEBUG "%c%s\n", flag,
+ mask_flags[i].mask_name);
+ }
+ }
+
+ return count;
+}
+
+/* Debug strings are of the form:
+ * .bnnn print info on block n
+ * .cobjn,chunkn print nand chunk id for objn:chunkn
+ */
+
+static int yaffs_proc_debug_write(struct file *file, const char *buf,
+ unsigned long count)
+{
+
+ char str[100];
+ char *p0;
+ char *p1;
+ long p1_val;
+ long p0_val;
+ char cmd;
+ struct list_head *item;
+
+ memset(str, 0, sizeof(str));
+ memcpy(str, buf, min((size_t)count, sizeof(str) -1));
+
+ cmd = str[1];
+
+ p0 = str + 2;
+
+ p1 = p0;
+
+ while (*p1 && *p1 != ',') {
+ p1++;
+ }
+ *p1 = '\0';
+ p1++;
+
+ p0_val = simple_strtol(p0, NULL, 0);
+ p1_val = simple_strtol(p1, NULL, 0);
+
+
+ mutex_lock(&yaffs_context_lock);
+
+ /* Locate and print the Nth entry. Order N-squared but N is small. */
+ list_for_each(item, &yaffs_context_list) {
+ struct yaffs_linux_context *dc =
+ list_entry(item, struct yaffs_linux_context,
+ context_list);
+ struct yaffs_dev *dev = dc->dev;
+
+ if (cmd == 'b') {
+ struct yaffs_block_info *bi;
+
+ bi = yaffs_get_block_info(dev,p0_val);
+
+ if(bi) {
+ printk("Block %d: state %d, retire %d, use %d, seq %d\n",
+ (int)p0_val, bi->block_state,
+ bi->needs_retiring, bi->pages_in_use,
+ bi->seq_number);
+ }
+ } else if (cmd == 'c') {
+ struct yaffs_obj *obj;
+ int nand_chunk;
+
+ obj = yaffs_find_by_number(dev, p0_val);
+ if (!obj)
+ printk("No obj %d\n", (int)p0_val);
+ else {
+ if(p1_val == 0)
+ nand_chunk = obj->hdr_chunk;
+ else
+ nand_chunk =
+ yaffs_find_chunk_in_file(obj,
+ p1_val, NULL);
+ printk("Nand chunk for %d:%d is %d\n",
+ (int)p0_val, (int)p1_val, nand_chunk);
+ }
+ }
+ }
+
+ mutex_unlock(&yaffs_context_lock);
+
+ return count;
+}
+
+
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 14, 0))
+static int yaffs_proc_write(struct file *file, const char *buf,
+ unsigned long count, void *ppos)
+#else
+static ssize_t yaffs_proc_write(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
+#endif
+{
+ if (buf[0] == '.')
+ return yaffs_proc_debug_write(file, buf, count);
+ return yaffs_proc_write_trace_options(file, buf, count);
+}
+
+/* Stuff to handle installation of file systems */
+struct file_system_to_install {
+ struct file_system_type *fst;
+ int installed;
+};
+
+static struct file_system_to_install fs_to_install[] = {
+ {&yaffs_fs_type, 0},
+ {&yaffs2_fs_type, 0},
+ {NULL, 0}
+};
+
+
+#ifdef YAFFS_NEW_PROCFS
+static int yaffs_proc_show(struct seq_file *m, void *v)
+{
+ /* FIXME: Unify in a better way? */
+ char buffer[512];
+ char *start;
+ int len;
+
+ len = yaffs_proc_read(buffer, &start, 0, sizeof(buffer), NULL, NULL);
+ seq_puts(m, buffer);
+ return 0;
+}
+
+static int yaffs_proc_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, yaffs_proc_show, NULL);
+}
+
+static struct file_operations procfs_ops = {
+ .owner = THIS_MODULE,
+ .open = yaffs_proc_open,
+ .read = seq_read,
+ .write = yaffs_proc_write,
+};
+
+static int yaffs_procfs_init(void)
+{
+ /* Install the proc_fs entries */
+ my_proc_entry = proc_create("yaffs",
+ S_IRUGO | S_IFREG,
+ YPROC_ROOT,
+ &procfs_ops);
+
+ if (my_proc_entry) {
+ return 0;
+ } else {
+ return -ENOMEM;
+ }
+}
+
+#else
+
+
+static int yaffs_procfs_init(void)
+{
+ /* Install the proc_fs entries */
+ my_proc_entry = create_proc_entry("yaffs",
+ S_IRUGO | S_IFREG, YPROC_ROOT);
+
+ if (my_proc_entry) {
+ my_proc_entry->write_proc = yaffs_proc_write;
+ my_proc_entry->read_proc = yaffs_proc_read;
+ my_proc_entry->data = NULL;
+ return 0;
+ } else {
+ return -ENOMEM;
+ }
+}
+
+#endif
+
+
+static int __init init_yaffs_fs(void)
+{
+ int error = 0;
+ struct file_system_to_install *fsinst;
+
+ yaffs_trace(YAFFS_TRACE_ALWAYS,
+ "yaffs Installing.");
+
+ mutex_init(&yaffs_context_lock);
+
+ error = yaffs_procfs_init();
+ if (error)
+ return error;
+
+ /* Now add the file system entries */
+
+ fsinst = fs_to_install;
+
+ while (fsinst->fst && !error) {
+ error = register_filesystem(fsinst->fst);
+ if (!error)
+ fsinst->installed = 1;
+ fsinst++;
+ }
+
+ /* Any errors? uninstall */
+ if (error) {
+ fsinst = fs_to_install;
+
+ while (fsinst->fst) {
+ if (fsinst->installed) {
+ unregister_filesystem(fsinst->fst);
+ fsinst->installed = 0;
+ }
+ fsinst++;
+ }
+ }
+
+ return error;
+}
+
+static void __exit exit_yaffs_fs(void)
+{
+
+ struct file_system_to_install *fsinst;
+
+ yaffs_trace(YAFFS_TRACE_ALWAYS,
+ "yaffs removing.");
+
+ remove_proc_entry("yaffs", YPROC_ROOT);
+
+ fsinst = fs_to_install;
+
+ while (fsinst->fst) {
+ if (fsinst->installed) {
+ unregister_filesystem(fsinst->fst);
+ fsinst->installed = 0;
+ }
+ fsinst++;
+ }
+}
+
+module_init(init_yaffs_fs)
+ module_exit(exit_yaffs_fs)
+
+ MODULE_DESCRIPTION("YAFFS2 - a NAND specific flash file system");
+MODULE_AUTHOR("Charles Manning, Aleph One Ltd., 2002-2011");
+MODULE_LICENSE("GPL");
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