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Diffstat (limited to 'target/linux/generic/files/fs/yaffs2/yaffs_vfs.c')
-rw-r--r--target/linux/generic/files/fs/yaffs2/yaffs_vfs.c3665
1 files changed, 0 insertions, 3665 deletions
diff --git a/target/linux/generic/files/fs/yaffs2/yaffs_vfs.c b/target/linux/generic/files/fs/yaffs2/yaffs_vfs.c
deleted file mode 100644
index 73dcc3c..0000000
--- a/target/linux/generic/files/fs/yaffs2/yaffs_vfs.c
+++ /dev/null
@@ -1,3665 +0,0 @@
-/*
- * 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))
-#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(3,12,0))
-#define YAFFS_NEW_PROCFS
-#include <linux/seq_file.h>
-#endif
-
-
-#define update_dir_time(dir) do {\
- (dir)->i_ctime = (dir)->i_mtime = CURRENT_TIME; \
- } while (0)
-
-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_CACHE_SHIFT;
- struct yaffs_dev *dev;
-
- yaffs_trace(YAFFS_TRACE_OS,
- "yaffs_readpage_nolock at %lld, size %08x",
- (long long)pos,
- (unsigned)PAGE_CACHE_SIZE);
-
- obj = yaffs_dentry_to_obj(f->f_dentry);
-
- 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(f->f_dentry);
-
- 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(f->f_dentry);
-
- 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(f->f_dentry);
-
- 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 = f->f_dentry->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(file->f_dentry);
-
- 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 = {
- .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,
- .splice_read = generic_file_splice_read,
- .splice_write = generic_file_splice_write,
- .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 = inode_change_ok(inode, 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;
-}
-
-static int yaffs_setxattr(struct dentry *dentry, const char *name,
- const void *value, size_t size, int flags)
-{
- 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_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;
-}
-
-static ssize_t yaffs_getxattr(struct dentry * dentry, const char *name,
- void *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_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;
-}
-
-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,
- .setxattr = yaffs_setxattr,
- .getxattr = yaffs_getxattr,
- .listxattr = yaffs_listxattr,
- .removexattr = yaffs_removexattr,
-};
-
-
-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_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
-}
-
-
-#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,
- .follow_link = yaffs_follow_link,
-#if (YAFFS_NEW_FOLLOW_LINK == 1)
- .put_link = yaffs_put_link,
-#endif
- .setattr = yaffs_setattr,
- .setxattr = yaffs_setxattr,
- .getxattr = yaffs_getxattr,
- .listxattr = yaffs_listxattr,
- .removexattr = yaffs_removexattr,
-};
-
-#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
- */
-static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
- struct inode *new_dir, struct dentry *new_dentry)
-{
- 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,
- .setxattr = yaffs_setxattr,
- .getxattr = yaffs_getxattr,
- .listxattr = yaffs_listxattr,
- .removexattr = yaffs_removexattr,
-};
-
-/*-----------------------------------------------------------------*/
-/* 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(f->f_dentry);
- 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 = f->f_dentry->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(f->f_dentry);
- 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 && mtd->type != MTD_MLCNANDFLASH) {
- 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");