diff options
Diffstat (limited to 'target/linux/generic/files/fs/yaffs2/yaffs_vfs.c')
| -rw-r--r-- | target/linux/generic/files/fs/yaffs2/yaffs_vfs.c | 3462 |
1 files changed, 3462 insertions, 0 deletions
diff --git a/target/linux/generic/files/fs/yaffs2/yaffs_vfs.c b/target/linux/generic/files/fs/yaffs2/yaffs_vfs.c new file mode 100644 index 0000000000..67050d4e3d --- /dev/null +++ b/target/linux/generic/files/fs/yaffs2/yaffs_vfs.c @@ -0,0 +1,3462 @@ +/* + * 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 + + +#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); + + 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); + 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; + + ret = vfs_readlink(dentry, buffer, buflen, alias); + 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, 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 = YCRED(current)->fsuid; + gid_t gid = + (dir->i_mode & S_ISGID) ? dir->i_gid : YCRED(current)->fsgid; + + 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 = YCRED(current)->fsuid; + gid_t gid = + (dir->i_mode & S_ISGID) ? dir->i_gid : YCRED(current)->fsgid; + + 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); + } + +} + + +/*-----------------------------------------------------------------*/ + +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; +} + +static const struct file_operations yaffs_dir_operations = { + .read = generic_read_dir, + .readdir = yaffs_readdir, + .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 = obj->yst_uid; + inode->i_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, inode->i_uid, inode->i_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); + } + } +} + +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); + 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; +} + + + +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 +}; + +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 (!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) { + if (dev) + kfree(dev); + if (context) + kfree(context); + dev = NULL; + context = NULL; + } + + if (!dev) { + /* 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 built:" __DATE__ " " __TIME__ + "\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, void *data) +{ + 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, void *data) +{ + + 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(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; +} + +static int yaffs_proc_write(struct file *file, const char *buf, + unsigned long count, void *data) +{ + if (buf[0] == '.') + return yaffs_proc_debug_write(file, buf, count, data); + return yaffs_proc_write_trace_options(file, buf, count, data); +} + +/* 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} +}; + +static int __init init_yaffs_fs(void) +{ + int error = 0; + struct file_system_to_install *fsinst; + + yaffs_trace(YAFFS_TRACE_ALWAYS, + "yaffs built " __DATE__ " " __TIME__ " Installing."); + + mutex_init(&yaffs_context_lock); + + /* 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; + } else { + return -ENOMEM; + } + + /* 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 built " __DATE__ " " __TIME__ " 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"); |