Signed-off-by: Charles Manning <cdhmanning@xxxxxxxxx> --- MAINTAINERS | 8 + fs/Kconfig | 1 + fs/Makefile | 1 + fs/yaffs2/Kconfig | 161 +++ fs/yaffs2/Makefile | 17 + fs/yaffs2/yaffs_vfs.c | 2917 +++++++++++++++++++++++++++++++++++++++++++++++++ 6 files changed, 3105 insertions(+), 0 deletions(-) create mode 100644 fs/yaffs2/Kconfig create mode 100644 fs/yaffs2/Makefile create mode 100644 fs/yaffs2/yaffs_vfs.c diff --git a/MAINTAINERS b/MAINTAINERS index b3be8b3..67c9155 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -6666,6 +6666,14 @@ S: Maintained F: drivers/net/hamradio/yam* F: include/linux/yam.h +YAFFS2 FILESYSTEM +M: Charles Manning <cdhmanning@xxxxxxxxx> +L: yaffs@xxxxxxxxxxxxxxxxxx +S: Maintained +F: fs/yaffs2/ +T: git git://www.aleph1.co.uk/yaffs2 +W: http://www.yaffs.net/ + YEALINK PHONE DRIVER M: Henk Vergonet <Henk.Vergonet@xxxxxxxxx> L: usbb2k-api-dev@xxxxxxxxxx diff --git a/fs/Kconfig b/fs/Kconfig index 771f457..069abb1 100644 --- a/fs/Kconfig +++ b/fs/Kconfig @@ -176,6 +176,7 @@ source "fs/hfsplus/Kconfig" source "fs/befs/Kconfig" source "fs/bfs/Kconfig" source "fs/efs/Kconfig" +source "fs/yaffs2/Kconfig" source "fs/jffs2/Kconfig" # UBIFS File system configuration source "fs/ubifs/Kconfig" diff --git a/fs/Makefile b/fs/Makefile index a7f7cef..e370ea5 100644 --- a/fs/Makefile +++ b/fs/Makefile @@ -121,3 +121,4 @@ obj-$(CONFIG_BTRFS_FS) += btrfs/ obj-$(CONFIG_GFS2_FS) += gfs2/ obj-$(CONFIG_EXOFS_FS) += exofs/ obj-$(CONFIG_CEPH_FS) += ceph/ +obj-$(CONFIG_YAFFS_FS) += yaffs2/ diff --git a/fs/yaffs2/Kconfig b/fs/yaffs2/Kconfig new file mode 100644 index 0000000..6354140 --- /dev/null +++ b/fs/yaffs2/Kconfig @@ -0,0 +1,161 @@ +# +# YAFFS file system configurations +# + +config YAFFS_FS + tristate "YAFFS2 file system support" + default n + depends on MTD_BLOCK + select YAFFS_YAFFS1 + select YAFFS_YAFFS2 + help + YAFFS2, or Yet Another Flash Filing System, is a filing system + optimised for NAND Flash chips. + + To compile the YAFFS2 file system support as a module, choose M + here: the module will be called yaffs2. + + If unsure, say N. + + Further information on YAFFS2 is available at + <http://www.aleph1.co.uk/yaffs/>. + +config YAFFS_YAFFS1 + bool "512 byte / page devices" + depends on YAFFS_FS + default y + help + Enable YAFFS1 support -- yaffs for 512 byte / page devices + + Not needed for 2K-page devices. + + If unsure, say Y. + +config YAFFS_9BYTE_TAGS + bool "Use older-style on-NAND data format with pageStatus byte" + depends on YAFFS_YAFFS1 + default n + help + + Older-style on-NAND data format has a "pageStatus" byte to record + chunk/page state. This byte is zero when the page is discarded. + Choose this option if you have existing on-NAND data using this + format that you need to continue to support. New data written + also uses the older-style format. Note: Use of this option + generally requires that MTD's oob layout be adjusted to use the + older-style format. See notes on tags formats and MTD versions + in yaffs_mtdif1.c. + + If unsure, say N. + +config YAFFS_DOES_ECC + bool "Lets Yaffs do its own ECC" + depends on YAFFS_FS && YAFFS_YAFFS1 && !YAFFS_9BYTE_TAGS + default n + help + This enables Yaffs to use its own ECC functions instead of using + the ones from the generic MTD-NAND driver. + + If unsure, say N. + +config YAFFS_ECC_WRONG_ORDER + bool "Use the same ecc byte order as Steven Hill's nand_ecc.c" + depends on YAFFS_FS && YAFFS_DOES_ECC && !YAFFS_9BYTE_TAGS + default n + help + This makes yaffs_ecc.c use the same ecc byte order as Steven + Hill's nand_ecc.c. If not set, then you get the same ecc byte + order as SmartMedia. + + If unsure, say N. + +config YAFFS_YAFFS2 + bool "2048 byte (or larger) / page devices" + depends on YAFFS_FS + default y + help + Enable YAFFS2 support -- yaffs for >= 2K bytes per page devices + + If unsure, say Y. + +config YAFFS_AUTO_YAFFS2 + bool "Autoselect yaffs2 format" + depends on YAFFS_YAFFS2 + default y + help + Without this, you need to explicitely use yaffs2 as the file + system type. With this, you can say "yaffs" and yaffs or yaffs2 + will be used depending on the device page size (yaffs on + 512-byte page devices, yaffs2 on 2K page devices). + + If unsure, say Y. + +config YAFFS_DISABLE_TAGS_ECC + bool "Disable YAFFS from doing ECC on tags by default" + depends on YAFFS_FS && YAFFS_YAFFS2 + default n + help + This defaults Yaffs to using its own ECC calculations on tags instead of + just relying on the MTD. + This behavior can also be overridden with tags_ecc_on and + tags_ecc_off mount options. + + If unsure, say N. + +config YAFFS_ALWAYS_CHECK_CHUNK_ERASED + bool "Force chunk erase check" + depends on YAFFS_FS + default n + help + Normally YAFFS only checks chunks before writing until an erased + chunk is found. This helps to detect any partially written + chunks that might have happened due to power loss. + + Enabling this forces on the test that chunks are erased in flash + before writing to them. This takes more time but is potentially + a bit more secure. + + Suggest setting Y during development and ironing out driver + issues etc. Suggest setting to N if you want faster writing. + + If unsure, say Y. + +config YAFFS_EMPTY_LOST_AND_FOUND + bool "Empty lost and found on boot" + depends on YAFFS_FS + default n + help + If this is enabled then the contents of lost and found is + automatically dumped at mount. + + If unsure, say N. + +config YAFFS_DISABLE_BLOCK_REFRESHING + bool "Disable yaffs2 block refreshing" + depends on YAFFS_FS + default n + help + If this is set, then block refreshing is disabled. + Block refreshing infrequently refreshes the oldest block in + a yaffs2 file system. This mechanism helps to refresh flash to + mitigate against data loss. This is particularly useful for MLC. + + If unsure, say N. + +config YAFFS_DISABLE_BACKGROUND + bool "Disable yaffs2 background processing" + depends on YAFFS_FS + default n + help + If this is set, then background processing is disabled. + Background processing makes many foreground activities faster. + + If unsure, say N. + +config YAFFS_XATTR + bool "Enable yaffs2 xattr support" + depends on YAFFS_FS + default y + help + If this is set then yaffs2 will provide xattr support. + If unsure, say Y. diff --git a/fs/yaffs2/Makefile b/fs/yaffs2/Makefile new file mode 100644 index 0000000..e63a28a --- /dev/null +++ b/fs/yaffs2/Makefile @@ -0,0 +1,17 @@ +# +# Makefile for the linux YAFFS filesystem routines. +# + +obj-$(CONFIG_YAFFS_FS) += yaffs.o + +yaffs-y := yaffs_ecc.o yaffs_vfs.o yaffs_guts.o yaffs_checkptrw.o +yaffs-y += yaffs_packedtags1.o yaffs_packedtags2.o yaffs_nand.o +yaffs-y += yaffs_tagscompat.o yaffs_tagsvalidity.o +yaffs-y += yaffs_mtdif.o yaffs_mtdif1.o yaffs_mtdif2.o +yaffs-y += yaffs_nameval.o yaffs_attribs.o +yaffs-y += yaffs_allocator.o +yaffs-y += yaffs_yaffs1.o +yaffs-y += yaffs_yaffs2.o +yaffs-y += yaffs_bitmap.o +yaffs-y += yaffs_verify.o + diff --git a/fs/yaffs2/yaffs_vfs.c b/fs/yaffs2/yaffs_vfs.c new file mode 100644 index 0000000..89c03fd --- /dev/null +++ b/fs/yaffs2/yaffs_vfs.c @@ -0,0 +1,2917 @@ +/* + * YAFFS: Yet Another Flash File System. A NAND-flash specific file system. + * + * Copyright (C) 2002-2010 Aleph One Ltd. + * for Toby Churchill Ltd and Brightstar Engineering + * + * Created by Charles Manning <charles@xxxxxxxxxxxx> + * 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. + */ + +/* + * NB There are two variants of Linux VFS glue code. This variant supports + * a single version and should not include any multi-version code. + */ +#include <linux/version.h> + +#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> +#include <linux/smp_lock.h> +#include <linux/pagemap.h> +#include <linux/mtd/mtd.h> +#include <linux/interrupt.h> +#include <linux/string.h> +#include <linux/ctype.h> +#include <linux/namei.h> +#include <linux/exportfs.h> +#include <linux/kthread.h> +#include <linux/delay.h> +#include <linux/freezer.h> + +#include <asm/div64.h> + +#include <linux/statfs.h> + +#define UnlockPage(p) unlock_page(p) +#define Page_Uptodate(page) test_bit(PG_uptodate, &(page)->flags) + +#define yaffs_devname(sb, buf) bdevname(sb->s_bdev, buf) + +#define YPROC_ROOT NULL + +#define Y_INIT_TIMER(a) init_timer_on_stack(a) + +#define WRITE_SIZE_STR "writesize" +#define WRITE_SIZE(mtd) ((mtd)->writesize) + +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; +} + +#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_mtdif1.h" +#include "yaffs_mtdif2.h" + +unsigned int yaffs_trace_mask = YAFFS_TRACE_BAD_BLOCKS | YAFFS_TRACE_ALWAYS; +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; + +/* Module Parameters */ +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); + +#define Y_IGET(sb, inum) yaffs_iget((sb), (inum)) + +static struct inode *yaffs_iget(struct super_block *sb, unsigned long ino); + +#define yaffs_inode_to_obj_lv(iptr) ((iptr)->i_private) +#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) +#define yaffs_super_to_dev(sb) ((struct yaffs_dev *)sb->s_fs_info) + +#define update_dir_time(dir) do {\ + (dir)->i_ctime = (dir)->i_mtime = CURRENT_TIME; \ + } while(0) + +static void yaffs_put_super(struct super_block *sb); + +static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n, + loff_t * pos); +static ssize_t yaffs_hold_space(struct file *f); +static void yaffs_release_space(struct file *f); + +static int yaffs_file_flush(struct file *file, fl_owner_t id); + +static int yaffs_sync_object(struct file *file, int datasync); + +static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir); + +static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode, + struct nameidata *n); +static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry, + struct nameidata *n); +static int yaffs_link(struct dentry *old_dentry, struct inode *dir, + struct dentry *dentry); +static int yaffs_unlink(struct inode *dir, struct dentry *dentry); +static int yaffs_symlink(struct inode *dir, struct dentry *dentry, + const char *symname); +static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode); + +static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode, + dev_t dev); +static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry, + struct inode *new_dir, struct dentry *new_dentry); +static int yaffs_setattr(struct dentry *dentry, struct iattr *attr); + +static int yaffs_sync_fs(struct super_block *sb, int wait); +static void yaffs_write_super(struct super_block *sb); + +static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf); + +#ifdef YAFFS_HAS_PUT_INODE +static void yaffs_put_inode(struct inode *inode); +#endif + +static void yaffs_evict_inode(struct inode *); + +static int yaffs_readpage(struct file *file, struct page *page); +static int yaffs_writepage(struct page *page, struct writeback_control *wbc); + +#ifdef CONFIG_YAFFS_XATTR +static int yaffs_setxattr(struct dentry *dentry, const char *name, + const void *value, size_t size, int flags); +static ssize_t yaffs_getxattr(struct dentry *dentry, const char *name, void *buff, + size_t size); +static int yaffs_removexattr(struct dentry *dentry, const char *name); +static ssize_t yaffs_listxattr(struct dentry *dentry, char *buff, size_t size); +#endif + +static int yaffs_write_begin(struct file *filp, struct address_space *mapping, + loff_t pos, unsigned len, unsigned flags, + struct page **pagep, void **fsdata); +static int yaffs_write_end(struct file *filp, struct address_space *mapping, + loff_t pos, unsigned len, unsigned copied, + struct page *pg, void *fsdadata); + +static int yaffs_readlink(struct dentry *dentry, char __user * buffer, + int buflen); +void yaffs_put_link(struct dentry *dentry, struct nameidata *nd, void *alias); +static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd); + +static void yaffs_touch_super(struct yaffs_dev *dev); + +static int yaffs_vfs_setattr(struct inode *, struct iattr *); + +static struct address_space_operations yaffs_file_address_operations = { + .readpage = yaffs_readpage, + .writepage = yaffs_writepage, + .write_begin = yaffs_write_begin, + .write_end = yaffs_write_end, +}; + +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, +}; + +static const struct inode_operations yaffs_file_inode_operations = { + .setattr = yaffs_setattr, +#ifdef CONFIG_YAFFS_XATTR + .setxattr = yaffs_setxattr, + .getxattr = yaffs_getxattr, + .listxattr = yaffs_listxattr, + .removexattr = yaffs_removexattr, +#endif +}; + +static const struct inode_operations yaffs_symlink_inode_operations = { + .readlink = yaffs_readlink, + .follow_link = yaffs_follow_link, + .put_link = yaffs_put_link, + .setattr = yaffs_setattr, +#ifdef CONFIG_YAFFS_XATTR + .setxattr = yaffs_setxattr, + .getxattr = yaffs_getxattr, + .listxattr = yaffs_listxattr, + .removexattr = yaffs_removexattr, +#endif +}; + +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, +#ifdef CONFIG_YAFFS_XATTR + .setxattr = yaffs_setxattr, + .getxattr = yaffs_getxattr, + .listxattr = yaffs_listxattr, + .removexattr = yaffs_removexattr, +#endif +}; + +static const struct file_operations yaffs_dir_operations = { + .read = generic_read_dir, + .readdir = yaffs_readdir, + .fsync = yaffs_sync_object, + .llseek = generic_file_llseek, +}; + +static const struct super_operations yaffs_super_ops = { + .statfs = yaffs_statfs, +#ifdef YAFFS_HAS_PUT_INODE + .put_inode = yaffs_put_inode, +#endif + .put_super = yaffs_put_super, + .evict_inode = yaffs_evict_inode, + .sync_fs = yaffs_sync_fs, + .write_super = yaffs_write_super, +}; + +static int yaffs_vfs_setattr(struct inode *inode, struct iattr *attr) +{ + setattr_copy(inode, attr); + return 0; +} + +static int yaffs_vfs_setsize(struct inode *inode, loff_t newsize) +{ + truncate_setsize(inode, newsize); + return 0; +} + +static unsigned yaffs_gc_control_callback(struct yaffs_dev *dev) +{ + return yaffs_gc_control; +} + +static void yaffs_gross_lock(struct yaffs_dev *dev) +{ + T(YAFFS_TRACE_LOCK, (TSTR("yaffs locking %p\n"), current)); + mutex_lock(&(yaffs_dev_to_lc(dev)->gross_lock)); + T(YAFFS_TRACE_LOCK, (TSTR("yaffs locked %p\n"), current)); +} + +static void yaffs_gross_unlock(struct yaffs_dev *dev) +{ + T(YAFFS_TRACE_LOCK, (TSTR("yaffs unlocking %p\n"), current)); + mutex_unlock(&(yaffs_dev_to_lc(dev)->gross_lock)); +} + +/* ExportFS support */ +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, +}; + +/*-----------------------------------------------------------------*/ +/* 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 = + YMALLOC(sizeof(struct yaffs_search_context)); + 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); + YFREE(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) { + if (i) { + sc = list_entry(i, struct yaffs_search_context, others); + if (sc->next_return == obj) + yaffs_search_advance(sc); + } + } + +} + +/*-----------------------------------------------------------------*/ + +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; +} + +static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd) +{ + unsigned char *alias; + void *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) { + ret = ERR_PTR(-ENOMEM); + goto out; + } + + nd_set_link(nd, alias); + ret = (void *)alias; +out: + return ret; +} + +void yaffs_put_link(struct dentry *dentry, struct nameidata *nd, void *alias) +{ + kfree(alias); +} + +struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev, + struct yaffs_obj *obj); + +/* + * Lookup is used to find objects in the fs + */ + +static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry, + struct nameidata *n) +{ + 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); + + T(YAFFS_TRACE_OS, + (TSTR("yaffs_lookup for %d:%s\n"), + 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) { + T(YAFFS_TRACE_OS, + (TSTR("yaffs_lookup found %d\n"), obj->obj_id)); + + inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj); + + if (inode) { + T(YAFFS_TRACE_OS, (TSTR("yaffs_loookup dentry \n"))); + d_add(dentry, inode); + /* return dentry; */ + return NULL; + } + + } else { + T(YAFFS_TRACE_OS, (TSTR("yaffs_lookup not found\n"))); + + } + + d_add(dentry, inode); + + return NULL; +} + +#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) +{ + T(YAFFS_TRACE_OS, + (TSTR("yaffs_put_inode: ino %d, count %d\n"), (int)inode->i_ino, + atomic_read(&inode->i_count))); + +} +#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); +} + +/* 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); + + T(YAFFS_TRACE_OS, + (TSTR("yaffs_evict_inode: ino %d, count %d %s\n"), (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); + end_writeback(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); + } + +} + +static int yaffs_file_flush(struct file *file, fl_owner_t id) +{ + struct yaffs_obj *obj = yaffs_dentry_to_obj(file->f_dentry); + + struct yaffs_dev *dev = obj->my_dev; + + T(YAFFS_TRACE_OS, + (TSTR("yaffs_file_flush object %d (%s)\n"), obj->obj_id, + obj->dirty ? "dirty" : "clean")); + + yaffs_gross_lock(dev); + + yaffs_flush_file(obj, 1, 0); + + yaffs_gross_unlock(dev); + + return 0; +} + +static int yaffs_readpage_nolock(struct file *f, struct page *pg) +{ + /* Lifted from jffs2 */ + + struct yaffs_obj *obj; + unsigned char *pg_buf; + int ret; + + struct yaffs_dev *dev; + + T(YAFFS_TRACE_OS, + (TSTR("yaffs_readpage_nolock at %08x, size %08x\n"), + (unsigned)(pg->index << PAGE_CACHE_SHIFT), + (unsigned)PAGE_CACHE_SIZE)); + + obj = yaffs_dentry_to_obj(f->f_dentry); + + dev = obj->my_dev; + + BUG_ON(!PageLocked(pg)); + + pg_buf = kmap(pg); + /* FIXME: Can kmap fail? */ + + yaffs_gross_lock(dev); + + ret = yaffs_file_rd(obj, pg_buf, + pg->index << PAGE_CACHE_SHIFT, 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); + + T(YAFFS_TRACE_OS, (TSTR("yaffs_readpage_nolock done\n"))); + 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; + + T(YAFFS_TRACE_OS, (TSTR("yaffs_readpage\n"))); + ret = yaffs_readpage_unlock(f, pg); + T(YAFFS_TRACE_OS, (TSTR("yaffs_readpage done\n"))); + return ret; +} + +/* writepage inspired by/stolen from smbfs */ + +static int yaffs_writepage(struct page *page, struct writeback_control *wbc) +{ + 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) { + T(YAFFS_TRACE_OS, + (TSTR + ("yaffs_writepage at %08x, inode size = %08x!!!\n"), + (unsigned)(page->index << PAGE_CACHE_SHIFT), + (unsigned)inode->i_size)); + T(YAFFS_TRACE_OS, + (TSTR(" -> don't care!!\n"))); + + 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); + + T(YAFFS_TRACE_OS, + (TSTR("yaffs_writepage at %08x, size %08x\n"), + (unsigned)(page->index << PAGE_CACHE_SHIFT), n_bytes)); + T(YAFFS_TRACE_OS, + (TSTR("writepag0: obj = %05x, ino = %05x\n"), + (int)obj->variant.file_variant.file_size, (int)inode->i_size)); + + n_written = yaffs_wr_file(obj, buffer, + page->index << PAGE_CACHE_SHIFT, n_bytes, 0); + + yaffs_touch_super(dev); + + T(YAFFS_TRACE_OS, + (TSTR("writepag1: obj = %05x, ino = %05x\n"), + (int)obj->variant.file_variant.file_size, (int)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; +} + +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 */ + pg = grab_cache_page_write_begin(mapping, index, flags); + + *pagep = pg; + if (!pg) { + ret = -ENOMEM; + goto out; + } + T(YAFFS_TRACE_OS, + (TSTR("start yaffs_write_begin index %d(%x) uptodate %d\n"), + (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 */ + T(YAFFS_TRACE_OS, (TSTR("end yaffs_write_begin - ok\n"))); + + return 0; + +out: + T(YAFFS_TRACE_OS, + (TSTR("end yaffs_write_begin fail returning %d\n"), ret)); + if (space_held) + yaffs_release_space(filp); + if (pg) { + unlock_page(pg); + page_cache_release(pg); + } + return ret; +} + +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; + + T(YAFFS_TRACE_OS, + ("yaffs_write_end addr %p pos %x n_bytes %d\n", + addr, (unsigned)pos, copied)); + + ret = yaffs_file_write(filp, addr, copied, &pos); + + if (ret != copied) { + T(YAFFS_TRACE_OS, + (TSTR("yaffs_write_end not same size ret %d copied %d\n"), + ret, copied)); + SetPageError(pg); + } else { + /* Nothing */ + } + + kunmap(pg); + + yaffs_release_space(filp); + unlock_page(pg); + page_cache_release(pg); + return ret; +} + +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; + + 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; + inode->i_size = yaffs_get_obj_length(obj); + inode->i_blocks = (inode->i_size + 511) >> 9; + + inode->i_nlink = yaffs_get_obj_link_count(obj); + + T(YAFFS_TRACE_OS, + (TSTR + ("yaffs_fill_inode mode %x uid %d gid %d size %d count %d\n"), + inode->i_mode, inode->i_uid, inode->i_gid, + (int)inode->i_size, atomic_read(&inode->i_count))); + + switch (obj->yst_mode & S_IFMT) { + default: /* fifo, device or socket */ + init_special_inode(inode, obj->yst_mode, + old_decode_dev(obj->yst_rdev)); + 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 { + T(YAFFS_TRACE_OS, + (TSTR("yaffs_fill_inode invalid parameters\n"))); + } + +} + +struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev, + struct yaffs_obj *obj) +{ + struct inode *inode; + + if (!sb) { + T(YAFFS_TRACE_OS, + (TSTR("yaffs_get_inode for NULL super_block!!\n"))); + return NULL; + + } + + if (!obj) { + T(YAFFS_TRACE_OS, + (TSTR("yaffs_get_inode for NULL object!!\n"))); + return NULL; + + } + + T(YAFFS_TRACE_OS, + (TSTR("yaffs_get_inode for object %d\n"), 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; +} + +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, ipos; + struct inode *inode; + struct yaffs_dev *dev; + + obj = yaffs_dentry_to_obj(f->f_dentry); + + 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; + + if (!obj) + T(YAFFS_TRACE_OS, + (TSTR("yaffs_file_write: hey obj is null!\n"))); + else + T(YAFFS_TRACE_OS, + (TSTR("yaffs_file_write about to write writing %u(%x) bytes" + "to object %d at %d(%x)\n"), + (unsigned)n, (unsigned)n, obj->obj_id, ipos, ipos)); + + n_written = yaffs_wr_file(obj, buf, ipos, n, 0); + + yaffs_touch_super(dev); + + T(YAFFS_TRACE_OS, + (TSTR("yaffs_file_write: %d(%x) bytes written\n"), + (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; + + T(YAFFS_TRACE_OS, + (TSTR("yaffs_file_write size updated to %d bytes, " + "%d blocks\n"), ipos, (int)(inode->i_blocks))); + } + + } + yaffs_gross_unlock(dev); + return (n_written == 0) && (n > 0) ? -ENOSPC : n_written; +} + +/* 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); +} + +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; + } + + T(YAFFS_TRACE_OS, + (TSTR("yaffs_readdir: starting at %d\n"), (int)offset)); + + if (offset == 0) { + T(YAFFS_TRACE_OS, + (TSTR("yaffs_readdir: entry . ino %d \n"), + (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) { + T(YAFFS_TRACE_OS, + (TSTR("yaffs_readdir: entry .. ino %d \n"), + (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); + T(YAFFS_TRACE_OS, + (TSTR("yaffs_readdir: %s inode %d\n"), + 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; +} + +/* + * File creation. Allocate an inode, and we're done.. + */ + +#define YCRED(x) (x->cred) + +static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode, + dev_t rdev) +{ + 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) { + T(YAFFS_TRACE_OS, + (TSTR("yaffs_mknod: parent object %d type %d\n"), + parent->obj_id, parent->variant_type)); + } else { + T(YAFFS_TRACE_OS, + (TSTR("yaffs_mknod: could not get parent object\n"))); + return -EPERM; + } + + T(YAFFS_TRACE_OS, (TSTR("yaffs_mknod: making oject for %s, " + "mode %x dev %x\n"), + dentry->d_name.name, mode, rdev)); + + dev = parent->my_dev; + + yaffs_gross_lock(dev); + + switch (mode & S_IFMT) { + default: + /* Special (socket, fifo, device...) */ + T(YAFFS_TRACE_OS, (TSTR("yaffs_mknod: making special\n"))); + obj = + yaffs_create_special(parent, dentry->d_name.name, mode, uid, + gid, old_encode_dev(rdev)); + break; + case S_IFREG: /* file */ + T(YAFFS_TRACE_OS, (TSTR("yaffs_mknod: making file\n"))); + obj = yaffs_create_file(parent, dentry->d_name.name, mode, uid, + gid); + break; + case S_IFDIR: /* directory */ + T(YAFFS_TRACE_OS, (TSTR("yaffs_mknod: making directory\n"))); + obj = yaffs_create_dir(parent, dentry->d_name.name, mode, + uid, gid); + break; + case S_IFLNK: /* symlink */ + T(YAFFS_TRACE_OS, (TSTR("yaffs_mknod: making symlink\n"))); + 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); + T(YAFFS_TRACE_OS, + (TSTR("yaffs_mknod created object %d count = %d\n"), + obj->obj_id, atomic_read(&inode->i_count))); + error = 0; + yaffs_fill_inode_from_obj(dir, parent); + } else { + T(YAFFS_TRACE_OS, (TSTR("yaffs_mknod failed making object\n"))); + error = -ENOMEM; + } + + return error; +} + +static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode) +{ + int ret_val; + T(YAFFS_TRACE_OS, (TSTR("yaffs_mkdir\n"))); + ret_val = yaffs_mknod(dir, dentry, mode | S_IFDIR, 0); + return ret_val; +} + +static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode, + struct nameidata *n) +{ + T(YAFFS_TRACE_OS, (TSTR("yaffs_create\n"))); + return yaffs_mknod(dir, dentry, mode | S_IFREG, 0); +} + +static int yaffs_unlink(struct inode *dir, struct dentry *dentry) +{ + int ret_val; + + struct yaffs_dev *dev; + struct yaffs_obj *obj; + + T(YAFFS_TRACE_OS, + (TSTR("yaffs_unlink %d:%s\n"), + (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) { + dentry->d_inode->i_nlink--; + dir->i_version++; + yaffs_gross_unlock(dev); + mark_inode_dirty(dentry->d_inode); + update_dir_time(dir); + return 0; + } + yaffs_gross_unlock(dev); + return -ENOTEMPTY; +} + +/* + * 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; + + T(YAFFS_TRACE_OS, (TSTR("yaffs_link\n"))); + + 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) { + old_dentry->d_inode->i_nlink = yaffs_get_obj_link_count(obj); + d_instantiate(dentry, old_dentry->d_inode); + atomic_inc(&old_dentry->d_inode->i_count); + T(YAFFS_TRACE_OS, + (TSTR("yaffs_link link count %d i_count %d\n"), + 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; + + T(YAFFS_TRACE_OS, (TSTR("yaffs_symlink\n"))); + + 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); + T(YAFFS_TRACE_OS, (TSTR("symlink created OK\n"))); + return 0; + } else { + T(YAFFS_TRACE_OS, (TSTR("symlink not created\n"))); + } + + return -ENOMEM; +} + +static int yaffs_sync_object(struct file *file, int datasync) +{ + + struct yaffs_obj *obj; + struct yaffs_dev *dev; + struct dentry *dentry = file->f_path.dentry; + + obj = yaffs_dentry_to_obj(dentry); + + dev = obj->my_dev; + + T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC, (TSTR("yaffs_sync_object\n"))); + yaffs_gross_lock(dev); + yaffs_flush_file(obj, 1, datasync); + yaffs_gross_unlock(dev); + return 0; +} + +/* + * 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; + + T(YAFFS_TRACE_OS, (TSTR("yaffs_rename\n"))); + 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)) { + + T(YAFFS_TRACE_OS, (TSTR("target is non-empty dir\n"))); + + ret_val = YAFFS_FAIL; + } else { + /* Now does unlinking internally using shadowing mechanism */ + T(YAFFS_TRACE_OS, (TSTR("calling yaffs_rename_obj\n"))); + + 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) { + new_dentry->d_inode->i_nlink--; + mark_inode_dirty(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_setattr(struct dentry *dentry, struct iattr *attr) +{ + struct inode *inode = dentry->d_inode; + int error = 0; + struct yaffs_dev *dev; + + T(YAFFS_TRACE_OS, + (TSTR("yaffs_setattr of object %d\n"), + yaffs_inode_to_obj(inode)->obj_id)); + + /* Fail if a requested resize >= 2GB */ + if (attr->ia_valid & ATTR_SIZE && (attr->ia_size >> 31)) + error = -EINVAL; + + if (error == 0) + error = inode_change_ok(inode, attr); + if (error == 0) { + int result; + if (!error) { + error = yaffs_vfs_setattr(inode, attr); + T(YAFFS_TRACE_OS, (TSTR("inode_setattr called\n"))); + 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) { + T(YAFFS_TRACE_OS, (TSTR("resize to %d(%x)\n"), + (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); + + } + + T(YAFFS_TRACE_OS, (TSTR("yaffs_setattr done returning %d\n"), error)); + + return error; +} + +#ifdef CONFIG_YAFFS_XATTR +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); + + T(YAFFS_TRACE_OS, (TSTR("yaffs_setxattr of object %d\n"), 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); + + } + T(YAFFS_TRACE_OS, (TSTR("yaffs_setxattr done returning %d\n"), 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); + + T(YAFFS_TRACE_OS, + (TSTR("yaffs_getxattr \"%s\" from object %d\n"), 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); + + } + T(YAFFS_TRACE_OS, (TSTR("yaffs_getxattr done returning %d\n"), 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); + + T(YAFFS_TRACE_OS, + (TSTR("yaffs_removexattr of object %d\n"), 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); + + } + T(YAFFS_TRACE_OS, + (TSTR("yaffs_removexattr done returning %d\n"), 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); + + T(YAFFS_TRACE_OS, + (TSTR("yaffs_listxattr of object %d\n"), 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); + + } + T(YAFFS_TRACE_OS, (TSTR("yaffs_listxattr done returning %d\n"), error)); + + return error; +} + +#endif + +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; + + T(YAFFS_TRACE_OS, (TSTR("yaffs_statfs\n"))); + + 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 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) { + T(YAFFS_TRACE_OS, (TSTR("flushing obj %d\n"), + 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 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; +} + +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; + + T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC | YAFFS_TRACE_BACKGROUND, + (TSTR("yaffs_do_sync_fs: gc-urgency %d %s %s%s\n"), + gc_urgent, + sb->s_dirt ? "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 (sb->s_dirt || do_checkpoint) { + yaffs_flush_super(sb, !dev->is_checkpointed && do_checkpoint); + sb->s_dirt = 0; + if (oneshot_checkpoint) + yaffs_auto_checkpoint &= ~4; + } + yaffs_gross_unlock(dev); + + return 0; +} + +/* + * 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. + */ + +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; + + T(YAFFS_TRACE_BACKGROUND, + (TSTR("yaffs_background starting for dev %p\n"), (void *)dev)); + + set_freezable(); + while (context->bg_running) { + T(YAFFS_TRACE_BACKGROUND, (TSTR("yaffs_background\n"))); + + if (kthread_should_stop()) + break; + + if (try_to_freeze()) + continue; + + 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); + 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); + } + + 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; + } +} + +static void yaffs_write_super(struct super_block *sb) +{ + unsigned request_checkpoint = (yaffs_auto_checkpoint >= 2); + + T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC | YAFFS_TRACE_BACKGROUND, + (TSTR("yaffs_write_super%s\n"), + request_checkpoint ? " checkpt" : "")); + + yaffs_do_sync_fs(sb, request_checkpoint); + +} + +static int yaffs_sync_fs(struct super_block *sb, int wait) +{ + unsigned request_checkpoint = (yaffs_auto_checkpoint >= 1); + + T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC, + (TSTR("yaffs_sync_fs%s\n"), request_checkpoint ? " checkpt" : "")); + + yaffs_do_sync_fs(sb, request_checkpoint); + + return 0; +} + +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); + + T(YAFFS_TRACE_OS, (TSTR("yaffs_iget for %lu\n"), 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; +} + +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); + + T(YAFFS_TRACE_OS, (TSTR("yaffs_put_super\n"))); + + T(YAFFS_TRACE_OS | YAFFS_TRACE_BACKGROUND, + (TSTR("Shutting down yaffs background thread\n"))); + yaffs_bg_stop(dev); + T(YAFFS_TRACE_OS | YAFFS_TRACE_BACKGROUND, + (TSTR("yaffs background thread shut down\n"))); + + yaffs_gross_lock(dev); + + yaffs_flush_super(sb, 1); + + if (yaffs_dev_to_lc(dev)->put_super_fn) + yaffs_dev_to_lc(dev)->put_super_fn(sb); + + 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) { + YFREE(yaffs_dev_to_lc(dev)->spare_buffer); + yaffs_dev_to_lc(dev)->spare_buffer = NULL; + } + + kfree(dev); +} + +static void yaffs_mtd_put_super(struct super_block *sb) +{ + struct mtd_info *mtd = yaffs_dev_to_mtd(yaffs_super_to_dev(sb)); + + if (mtd->sync) + mtd->sync(mtd); + + put_mtd_device(mtd); +} + +static void yaffs_touch_super(struct yaffs_dev *dev) +{ + struct super_block *sb = yaffs_dev_to_lc(dev)->super; + + T(YAFFS_TRACE_OS, (TSTR("yaffs_touch_super() sb = %p\n"), sb)); + if (sb) + sb->s_dirt = 1; +} + +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; +}; + +#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, "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 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; + + struct yaffs_options options; + + unsigned mount_id; + int found; + struct yaffs_linux_context *context_iterator; + struct list_head *l; + + sb->s_magic = YAFFS_MAGIC; + sb->s_op = &yaffs_super_ops; + sb->s_flags |= MS_NOATIME; + + read_only = ((sb->s_flags & MS_RDONLY) != 0); + + sb->s_export_op = &yaffs_export_ops; + + if (!sb) + printk(KERN_INFO "yaffs: sb is NULL\n"); + else 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; + + T(YAFFS_TRACE_OS, + (TSTR("yaffs_read_super: Using yaffs%d\n"), yaffs_version)); + T(YAFFS_TRACE_OS, + (TSTR("yaffs_read_super: block size %d\n"), (int)(sb->s_blocksize))); + + T(YAFFS_TRACE_ALWAYS, + (TSTR("yaffs: Attempting MTD mount of %u.%u,\"%s\"\n"), + MAJOR(sb->s_dev), MINOR(sb->s_dev), yaffs_devname(sb, devname_buf))); + + /* Check it's an mtd device..... */ + if (MAJOR(sb->s_dev) != MTD_BLOCK_MAJOR) + return NULL; /* This isn't an mtd device */ + + /* Get the device */ + mtd = get_mtd_device(NULL, MINOR(sb->s_dev)); + if (!mtd) { + T(YAFFS_TRACE_ALWAYS, + (TSTR("yaffs: MTD device #%u doesn't appear to exist\n"), + MINOR(sb->s_dev))); + return NULL; + } + /* Check it's NAND */ + if (mtd->type != MTD_NANDFLASH) { + T(YAFFS_TRACE_ALWAYS, + (TSTR("yaffs: MTD device is not NAND it's type %d\n"), + mtd->type)); + return NULL; + } + + T(YAFFS_TRACE_OS, (TSTR(" erase %p\n"), mtd->erase)); + T(YAFFS_TRACE_OS, (TSTR(" read %p\n"), mtd->read)); + T(YAFFS_TRACE_OS, (TSTR(" write %p\n"), mtd->write)); + T(YAFFS_TRACE_OS, (TSTR(" readoob %p\n"), mtd->read_oob)); + T(YAFFS_TRACE_OS, (TSTR(" writeoob %p\n"), mtd->write_oob)); + T(YAFFS_TRACE_OS, (TSTR(" block_isbad %p\n"), mtd->block_isbad)); + T(YAFFS_TRACE_OS, (TSTR(" block_markbad %p\n"), mtd->block_markbad)); + T(YAFFS_TRACE_OS, (TSTR(" %s %d\n"), WRITE_SIZE_STR, WRITE_SIZE(mtd))); + T(YAFFS_TRACE_OS, (TSTR(" oobsize %d\n"), mtd->oobsize)); + T(YAFFS_TRACE_OS, (TSTR(" erasesize %d\n"), mtd->erasesize)); + T(YAFFS_TRACE_OS, (TSTR(" size %lld\n"), mtd->size)); + +#ifdef CONFIG_YAFFS_AUTO_YAFFS2 + + if (yaffs_version == 1 && WRITE_SIZE(mtd) >= 2048) { + T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: auto selecting yaffs2\n"))); + yaffs_version = 2; + } + + /* Added NCB 26/5/2006 for completeness */ + if (yaffs_version == 2 && !options.inband_tags + && WRITE_SIZE(mtd) == 512) { + T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: auto selecting yaffs1\n"))); + yaffs_version = 1; + } +#endif + + if (yaffs_version == 2) { + /* Check for version 2 style functions */ + if (!mtd->erase || + !mtd->block_isbad || + !mtd->block_markbad || + !mtd->read || + !mtd->write || !mtd->read_oob || !mtd->write_oob) { + T(YAFFS_TRACE_ALWAYS, + (TSTR("yaffs: MTD device does not support required " + "functions\n"))); + return NULL; + } + + if ((WRITE_SIZE(mtd) < YAFFS_MIN_YAFFS2_CHUNK_SIZE || + mtd->oobsize < YAFFS_MIN_YAFFS2_SPARE_SIZE) && + !options.inband_tags) { + T(YAFFS_TRACE_ALWAYS, + (TSTR("yaffs: MTD device does not have the " + "right page sizes\n"))); + return NULL; + } + } else { + /* Check for V1 style functions */ + if (!mtd->erase || + !mtd->read || + !mtd->write || !mtd->read_oob || !mtd->write_oob) { + T(YAFFS_TRACE_ALWAYS, + (TSTR("yaffs: MTD device does not support required " + "functions\n"))); + return NULL; + } + + if (WRITE_SIZE(mtd) < YAFFS_BYTES_PER_CHUNK || + mtd->oobsize != YAFFS_BYTES_PER_SPARE) { + T(YAFFS_TRACE_ALWAYS, + (TSTR("yaffs: MTD device does not support have the " + "right page sizes\n"))); + 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"); + 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 */ + T(YAFFS_TRACE_ALWAYS, + (TSTR("yaffs_read_super: Failed trying to allocate " + "struct yaffs_dev. \n"))); + 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; + + sb->s_fs_info = dev; + + dev->driver_context = mtd; + param->name = mtd->name; + + /* Set up the memory size parameters.... */ + + n_blocks = + YCALCBLOCKS(mtd->size, + (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK)); + + param->start_block = 0; + param->end_block = n_blocks - 1; + param->chunks_per_block = YAFFS_CHUNKS_PER_BLOCK; + param->total_bytes_per_chunk = YAFFS_BYTES_PER_CHUNK; + param->n_reserved_blocks = 5; + param->n_caches = (options.no_cache) ? 0 : 10; + param->inband_tags = options.inband_tags; + +#ifdef CONFIG_YAFFS_DISABLE_LAZY_LOAD + param->disable_lazy_load = 1; +#endif +#ifdef CONFIG_YAFFS_XATTR + param->enable_xattr = 1; +#endif + if (options.lazy_loading_overridden) + param->disable_lazy_load = !options.lazy_loading_enabled; + +#ifdef CONFIG_YAFFS_DISABLE_TAGS_ECC + param->no_tags_ecc = 1; +#endif + +#ifdef CONFIG_YAFFS_DISABLE_BACKGROUND +#else + param->defered_dir_update = 1; +#endif + + if (options.tags_ecc_overridden) + param->no_tags_ecc = !options.tags_ecc_on; + +#ifdef CONFIG_YAFFS_EMPTY_LOST_AND_FOUND + param->empty_lost_n_found = 1; +#endif + +#ifdef CONFIG_YAFFS_DISABLE_BLOCK_REFRESHING + param->refresh_period = 0; +#else + param->refresh_period = 500; +#endif + +#ifdef CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED + param->always_check_erased = 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->write_chunk_tags_fn = nandmtd2_write_chunk_tags; + param->read_chunk_tags_fn = nandmtd2_read_chunk_tags; + param->bad_block_fn = nandmtd2_mark_block_bad; + param->query_block_fn = nandmtd2_query_block; + yaffs_dev_to_lc(dev)->spare_buffer = YMALLOC(mtd->oobsize); + param->is_yaffs2 = 1; + param->total_bytes_per_chunk = mtd->writesize; + param->chunks_per_block = mtd->erasesize / mtd->writesize; + n_blocks = YCALCBLOCKS(mtd->size, mtd->erasesize); + + param->start_block = 0; + param->end_block = n_blocks - 1; + } else { + /* use the MTD interface in yaffs_mtdif1.c */ + param->write_chunk_tags_fn = nandmtd1_write_chunk_tags; + param->read_chunk_tags_fn = nandmtd1_read_chunk_tags; + param->bad_block_fn = nandmtd1_mark_block_bad; + param->query_block_fn = nandmtd1_query_block; + param->is_yaffs2 = 0; + } + /* ... and common functions */ + param->erase_fn = nandmtd_erase_block; + param->initialise_flash_fn = nandmtd_initialise; + + yaffs_dev_to_lc(dev)->put_super_fn = yaffs_mtd_put_super; + + param->sb_dirty_fn = yaffs_touch_super; + param->gc_control = yaffs_gc_control_callback; + + yaffs_dev_to_lc(dev)->super = sb; + +#ifndef CONFIG_YAFFS_DOES_ECC + param->use_nand_ecc = 1; +#endif + + 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); + + T(YAFFS_TRACE_OS, + (TSTR("yaffs_read_super: guts initialised %s\n"), + (err == YAFFS_OK) ? "OK" : "FAILED")); + + if (err == YAFFS_OK) + yaffs_bg_start(dev); + + if (!context->bg_thread) + param->defered_dir_update = 0; + + /* 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; + + T(YAFFS_TRACE_OS, (TSTR("yaffs_read_super: got root inode\n"))); + + root = d_alloc_root(inode); + + T(YAFFS_TRACE_OS, (TSTR("yaffs_read_super: d_alloc_root done\n"))); + + if (!root) { + iput(inode); + return NULL; + } + sb->s_root = root; + sb->s_dirt = !dev->is_checkpointed; + T(YAFFS_TRACE_ALWAYS, + (TSTR("yaffs_read_super: is_checkpointed %d\n"), + dev->is_checkpointed)); + + T(YAFFS_TRACE_OS, (TSTR("yaffs_read_super: done\n"))); + return sb; +} + +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; +} + +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); +} + +static struct file_system_type yaffs_fs_type = { + .owner = THIS_MODULE, + .name = "yaffs", + .get_sb = yaffs_read_super, + .kill_sb = kill_block_super, + .fs_flags = FS_REQUIRES_DEV, +}; + +#ifdef CONFIG_YAFFS_YAFFS2 + +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; +} + +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); +} + +static struct file_system_type yaffs2_fs_type = { + .owner = THIS_MODULE, + .name = "yaffs2", + .get_sb = yaffs2_read_super, + .kill_sb = kill_block_super, + .fs_flags = FS_REQUIRES_DEV, +}; +#endif /* CONFIG_YAFFS_YAFFS2 */ + +static struct proc_dir_entry *my_proc_entry; + +static char *yaffs_dump_dev_part0(char *buf, struct yaffs_dev *dev) +{ + buf += + sprintf(buf, "start_block........... %d\n", dev->param.start_block); + buf += + sprintf(buf, "end_block............. %d\n", dev->param.end_block); + buf += + sprintf(buf, "total_bytes_per_chunk. %d\n", + dev->param.total_bytes_per_chunk); + buf += + sprintf(buf, "use_nand_ecc.......... %d\n", + dev->param.use_nand_ecc); + buf += + sprintf(buf, "no_tags_ecc........... %d\n", dev->param.no_tags_ecc); + buf += + sprintf(buf, "is_yaffs2............. %d\n", dev->param.is_yaffs2); + buf += + sprintf(buf, "inband_tags........... %d\n", dev->param.inband_tags); + buf += + sprintf(buf, "empty_lost_n_found.... %d\n", + dev->param.empty_lost_n_found); + buf += + sprintf(buf, "disable_lazy_load..... %d\n", + dev->param.disable_lazy_load); + buf += + sprintf(buf, "refresh_period........ %d\n", + dev->param.refresh_period); + buf += sprintf(buf, "n_caches.............. %d\n", dev->param.n_caches); + buf += + sprintf(buf, "n_reserved_blocks..... %d\n", + dev->param.n_reserved_blocks); + buf += + sprintf(buf, "always_check_erased... %d\n", + dev->param.always_check_erased); + + buf += sprintf(buf, "\n"); + + return buf; +} + +static char *yaffs_dump_dev_part1(char *buf, struct yaffs_dev *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_retired_writes...... %u\n", dev->n_retired_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); + + 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, "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; +} + +static int yaffs_proc_write(struct file *file, const char *buf, + unsigned long count, void *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; + + T(YAFFS_TRACE_ALWAYS, + (TSTR("yaffs built " __DATE__ " " __TIME__ " Installing. \n"))); + +#ifdef CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED + T(YAFFS_TRACE_ALWAYS, + (TSTR + (" \n\n\n\nYAFFS-WARNING CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED selected.\n\n\n\n"))); +#endif + + 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; + + T(YAFFS_TRACE_ALWAYS, + (TSTR("yaffs built " __DATE__ " " __TIME__ " removing. \n"))); + + 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., 2002-2010"); +MODULE_LICENSE("GPL"); -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
