/* * YAFFS: Yet Another Flash File System. A NAND-flash specific file system. * * Copyright (C) 2002-2009 Aleph One Ltd. * for Toby Churchill Ltd and Brightstar Engineering * * Created by Charles Manning * 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 yaffs_Device associated with * this superblock * >> 2.6: sb->s_fs_info points to the yaffs_Device associated with this * superblock * >> inode->u.generic_ip points to the associated yaffs_Object. */ const char *yaffs_fs_c_version = "$Id: yaffs_fs.c,v 1.79 2009-03-17 01:12:00 wookey Exp $"; extern const char *yaffs_guts_c_version; #include #include #include #include #include #include #include #include #include #include #include #include #include #include "asm/div64.h" #include /* Added NCB 15-8-2003 */ #include #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) #define YPROC_ROOT NULL #define WRITE_SIZE_STR "writesize" #define WRITE_SIZE(mtd) ((mtd)->writesize) #define YAFFS_USE_WRITE_BEGIN_END 1 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 #include "yportenv.h" #include "yaffs_guts.h" #include #include "yaffs_mtdif.h" #include "yaffs_mtdif1.h" #include "yaffs_mtdif2.h" unsigned int yaffs_traceMask = YAFFS_TRACE_BAD_BLOCKS; unsigned int yaffs_wr_attempts = YAFFS_WR_ATTEMPTS; unsigned int yaffs_auto_checkpoint = 1; /* Module Parameters */ module_param(yaffs_traceMask, uint, 0644); module_param(yaffs_wr_attempts, uint, 0644); module_param(yaffs_auto_checkpoint, uint, 0644); /* Call local equivalent */ #define YAFFS_USE_OWN_IGET #define Y_IGET(sb, inum) yaffs_iget((sb), (inum)) static struct inode *yaffs_iget(struct super_block *sb, unsigned long ino); /*#define T(x) printk x */ #define yaffs_InodeToObjectLV(iptr) ((iptr)->i_private) #define yaffs_InodeToObject(iptr) ((yaffs_Object *)(yaffs_InodeToObjectLV(iptr))) #define yaffs_DentryToObject(dptr) yaffs_InodeToObject((dptr)->d_inode) #define yaffs_SuperToDevice(sb) ((yaffs_Device *)sb->s_fs_info) 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, struct dentry *dentry, int datasync); static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir); static int yaffs_create(struct inode *dir, struct dentry *dentry, umode_t mode, bool excl); 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_delete_inode(struct inode *); static void yaffs_clear_inode(struct inode *); static int yaffs_readpage(struct file *file, struct page *page); static int yaffs_writepage(struct page *page, struct writeback_control *wbc); #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); static int yaffs_write_end(struct file *filp, struct address_space *mapping, loff_t pos, unsigned len, unsigned copied, struct page *pg, void *fsdadata); #else static int yaffs_prepare_write(struct file *f, struct page *pg, unsigned offset, unsigned to); static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset, unsigned to); #endif static int yaffs_readlink(struct dentry *dentry, char __user *buffer, int buflen); static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd); 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 }; 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, }; static const struct inode_operations yaffs_symlink_inode_operations = { .readlink = yaffs_readlink, .follow_link = yaffs_follow_link, .setattr = yaffs_setattr, }; 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, }; static const struct file_operations yaffs_dir_operations = { .read = generic_read_dir, .readdir = yaffs_readdir, .fsync = yaffs_sync_object, }; 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, .delete_inode = yaffs_delete_inode, .clear_inode = yaffs_clear_inode, .sync_fs = yaffs_sync_fs, .write_super = yaffs_write_super, }; static void yaffs_GrossLock(yaffs_Device *dev) { T(YAFFS_TRACE_OS, ("yaffs locking %p\n", current)); down(&dev->grossLock); T(YAFFS_TRACE_OS, ("yaffs locked %p\n", current)); } static void yaffs_GrossUnlock(yaffs_Device *dev) { T(YAFFS_TRACE_OS, ("yaffs unlocking %p\n", current)); up(&dev->grossLock); } static int yaffs_readlink(struct dentry *dentry, char __user *buffer, int buflen) { unsigned char *alias; int ret; yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev; yaffs_GrossLock(dev); alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry)); yaffs_GrossUnlock(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; int ret; yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev; yaffs_GrossLock(dev); alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry)); yaffs_GrossUnlock(dev); if (!alias) { ret = -ENOMEM; goto out; } ret = vfs_follow_link(nd, alias); kfree(alias); out: return ERR_PTR(ret); } struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev, yaffs_Object *obj); /* * Lookup is used to find objects in the fs */ static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *n) { yaffs_Object *obj; struct inode *inode = NULL; /* NCB 2.5/2.6 needs NULL here */ yaffs_Device *dev = yaffs_InodeToObject(dir)->myDev; yaffs_GrossLock(dev); T(YAFFS_TRACE_OS, ("yaffs_lookup for %d:%s\n", yaffs_InodeToObject(dir)->objectId, dentry->d_name.name)); obj = yaffs_FindObjectByName(yaffs_InodeToObject(dir), dentry->d_name.name); obj = yaffs_GetEquivalentObject(obj); /* in case it was a hardlink */ /* Can't hold gross lock when calling yaffs_get_inode() */ yaffs_GrossUnlock(dev); if (obj) { T(YAFFS_TRACE_OS, ("yaffs_lookup found %d\n", obj->objectId)); inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj); if (inode) { T(YAFFS_TRACE_OS, ("yaffs_loookup dentry \n")); /* #if 0 asserted by NCB for 2.5/6 compatability - falls through to * d_add even if NULL inode */ #if 0 /*dget(dentry); // try to solve directory bug */ d_add(dentry, inode); /* return dentry; */ return NULL; #endif } } else { T(YAFFS_TRACE_OS, ("yaffs_lookup not found\n")); } /* added NCB for 2.5/6 compatability - forces add even if inode is * NULL which creates dentry hash */ 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, ("yaffs_put_inode: ino %d, count %d\n", (int)inode->i_ino, atomic_read(&inode->i_count))); } #endif /* clear is called to tell the fs to release any per-inode data it holds */ static void yaffs_clear_inode(struct inode *inode) { yaffs_Object *obj; yaffs_Device *dev; obj = yaffs_InodeToObject(inode); T(YAFFS_TRACE_OS, ("yaffs_clear_inode: ino %d, count %d %s\n", (int)inode->i_ino, atomic_read(&inode->i_count), obj ? "object exists" : "null object")); if (obj) { dev = obj->myDev; yaffs_GrossLock(dev); /* Clear the association between the inode and * the yaffs_Object. */ obj->myInode = NULL; yaffs_InodeToObjectLV(inode) = NULL; /* If the object freeing was deferred, then the real * free happens now. * This should fix the inode inconsistency problem. */ yaffs_HandleDeferedFree(obj); yaffs_GrossUnlock(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) { yaffs_Object *obj = yaffs_InodeToObject(inode); yaffs_Device *dev; T(YAFFS_TRACE_OS, ("yaffs_delete_inode: ino %d, count %d %s\n", (int)inode->i_ino, atomic_read(&inode->i_count), obj ? "object exists" : "null object")); if (obj) { dev = obj->myDev; yaffs_GrossLock(dev); yaffs_DeleteObject(obj); yaffs_GrossUnlock(dev); } truncate_inode_pages(&inode->i_data, 0); clear_inode(inode); } static int yaffs_file_flush(struct file *file, fl_owner_t id) { yaffs_Object *obj = yaffs_DentryToObject(file->f_dentry); yaffs_Device *dev = obj->myDev; T(YAFFS_TRACE_OS, ("yaffs_file_flush object %d (%s)\n", obj->objectId, obj->dirty ? "dirty" : "clean")); yaffs_GrossLock(dev); yaffs_FlushFile(obj, 1); yaffs_GrossUnlock(dev); return 0; } static int yaffs_readpage_nolock(struct file *f, struct page *pg) { /* Lifted from jffs2 */ yaffs_Object *obj; unsigned char *pg_buf; int ret; yaffs_Device *dev; T(YAFFS_TRACE_OS, ("yaffs_readpage at %08x, size %08x\n", (unsigned)(pg->index << PAGE_CACHE_SHIFT), (unsigned)PAGE_CACHE_SIZE)); obj = yaffs_DentryToObject(f->f_dentry); dev = obj->myDev; BUG_ON(!PageLocked(pg)); pg_buf = kmap(pg); /* FIXME: Can kmap fail? */ yaffs_GrossLock(dev); ret = yaffs_ReadDataFromFile(obj, pg_buf, pg->index << PAGE_CACHE_SHIFT, PAGE_CACHE_SIZE); yaffs_GrossUnlock(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, ("yaffs_readpage 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) { return yaffs_readpage_unlock(f, pg); } /* writepage inspired by/stolen from smbfs */ static int yaffs_writepage(struct page *page, struct writeback_control *wbc) { struct address_space *mapping = page->mapping; loff_t offset = (loff_t) page->index << PAGE_CACHE_SHIFT; struct inode *inode; unsigned long end_index; char *buffer; yaffs_Object *obj; int nWritten = 0; unsigned nBytes; if (!mapping) BUG(); inode = mapping->host; if (!inode) BUG(); if (offset > inode->i_size) { T(YAFFS_TRACE_OS, ("yaffs_writepage at %08x, inode size = %08x!!!\n", (unsigned)(page->index << PAGE_CACHE_SHIFT), (unsigned)inode->i_size)); T(YAFFS_TRACE_OS, (" -> don't care!!\n")); unlock_page(page); return 0; } end_index = inode->i_size >> PAGE_CACHE_SHIFT; /* easy case */ if (page->index < end_index) nBytes = PAGE_CACHE_SIZE; else nBytes = inode->i_size & (PAGE_CACHE_SIZE - 1); get_page(page); buffer = kmap(page); obj = yaffs_InodeToObject(inode); yaffs_GrossLock(obj->myDev); T(YAFFS_TRACE_OS, ("yaffs_writepage at %08x, size %08x\n", (unsigned)(page->index << PAGE_CACHE_SHIFT), nBytes)); T(YAFFS_TRACE_OS, ("writepag0: obj = %05x, ino = %05x\n", (int)obj->variant.fileVariant.fileSize, (int)inode->i_size)); nWritten = yaffs_WriteDataToFile(obj, buffer, page->index << PAGE_CACHE_SHIFT, nBytes, 0); T(YAFFS_TRACE_OS, ("writepag1: obj = %05x, ino = %05x\n", (int)obj->variant.fileVariant.fileSize, (int)inode->i_size)); yaffs_GrossUnlock(obj->myDev); kunmap(page); SetPageUptodate(page); UnlockPage(page); put_page(page); return (nWritten == nBytes) ? 0 : -ENOSPC; } #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; uint32_t offset = pos & (PAGE_CACHE_SIZE - 1); uint32_t to = offset + len; int ret = 0; int space_held = 0; T(YAFFS_TRACE_OS, ("start yaffs_write_begin\n")); /* Get a page */ pg = grab_cache_page_write_begin(mapping, index, flags); *pagep = pg; if (!pg) { ret = -ENOMEM; goto out; } /* Get fs space */ space_held = yaffs_hold_space(filp); if (!space_held) { ret = -ENOSPC; goto out; } /* Update page if required */ if (!Page_Uptodate(pg) && (offset || to < PAGE_CACHE_SIZE)) ret = yaffs_readpage_nolock(filp, pg); if (ret) goto out; /* Happy path return */ T(YAFFS_TRACE_OS, ("end yaffs_write_begin - ok\n")); return 0; out: T(YAFFS_TRACE_OS, ("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; } #else static int yaffs_prepare_write(struct file *f, struct page *pg, unsigned offset, unsigned to) { T(YAFFS_TRACE_OS, ("yaffs_prepair_write\n")); if (!Page_Uptodate(pg) && (offset || to < PAGE_CACHE_SIZE)) return yaffs_readpage_nolock(f, pg); return 0; } #endif #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; T(YAFFS_TRACE_OS, ("yaffs_write_end addr %x pos %x nBytes %d\n", (unsigned) addr, (int)pos, copied)); ret = yaffs_file_write(filp, addr, copied, &pos); if (ret != copied) { T(YAFFS_TRACE_OS, ("yaffs_write_end not same size ret %d copied %d\n", ret, copied)); SetPageError(pg); ClearPageUptodate(pg); } else { SetPageUptodate(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 nBytes = to - offset; int nWritten; unsigned spos = pos; unsigned saddr; kva = kmap(pg); addr = kva + offset; saddr = (unsigned) addr; T(YAFFS_TRACE_OS, ("yaffs_commit_write addr %x pos %x nBytes %d\n", saddr, spos, nBytes)); nWritten = yaffs_file_write(f, addr, nBytes, &pos); if (nWritten != nBytes) { T(YAFFS_TRACE_OS, ("yaffs_commit_write not same size nWritten %d nBytes %d\n", nWritten, nBytes)); SetPageError(pg); ClearPageUptodate(pg); } else { SetPageUptodate(pg); } kunmap(pg); T(YAFFS_TRACE_OS, ("yaffs_commit_write returning %d\n", nWritten == nBytes ? 0 : nWritten)); return nWritten == nBytes ? 0 : nWritten; } #endif static void yaffs_FillInodeFromObject(struct inode *inode, yaffs_Object *obj) { if (inode && obj) { /* Check mode against the variant type and attempt to repair if broken. */ __u32 mode = obj->yst_mode; switch (obj->variantType) { 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->objectId; 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_GetObjectFileLength(obj); inode->i_blocks = (inode->i_size + 511) >> 9; inode->i_nlink = yaffs_GetObjectLinkCount(obj); T(YAFFS_TRACE_OS, ("yaffs_FillInode 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_InodeToObjectLV(inode) = obj; obj->myInode = inode; } else { T(YAFFS_TRACE_OS, ("yaffs_FileInode invalid parameters\n")); } } struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev, yaffs_Object *obj) { struct inode *inode; if (!sb) { T(YAFFS_TRACE_OS, ("yaffs_get_inode for NULL super_block!!\n")); return NULL; } if (!obj) { T(YAFFS_TRACE_OS, ("yaffs_get_inode for NULL object!!\n")); return NULL; } T(YAFFS_TRACE_OS, ("yaffs_get_inode for object %d\n", obj->objectId)); inode = Y_IGET(sb, obj->objectId); 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 grossLock or deadlock will happen! */ return inode; } static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n, loff_t *pos) { yaffs_Object *obj; int nWritten, ipos; struct inode *inode; yaffs_Device *dev; obj = yaffs_DentryToObject(f->f_dentry); dev = obj->myDev; yaffs_GrossLock(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, ("yaffs_file_write: hey obj is null!\n")); else T(YAFFS_TRACE_OS, ("yaffs_file_write about to write writing %zu bytes" "to object %d at %d\n", n, obj->objectId, ipos)); nWritten = yaffs_WriteDataToFile(obj, buf, ipos, n, 0); T(YAFFS_TRACE_OS, ("yaffs_file_write writing %zu bytes, %d written at %d\n", n, nWritten, ipos)); if (nWritten > 0) { ipos += nWritten; *pos = ipos; if (ipos > inode->i_size) { inode->i_size = ipos; inode->i_blocks = (ipos + 511) >> 9; T(YAFFS_TRACE_OS, ("yaffs_file_write size updated to %d bytes, " "%d blocks\n", ipos, (int)(inode->i_blocks))); } } yaffs_GrossUnlock(dev); return nWritten == 0 ? -ENOSPC : nWritten; } /* 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) { yaffs_Object *obj; yaffs_Device *dev; int nFreeChunks; obj = yaffs_DentryToObject(f->f_dentry); dev = obj->myDev; yaffs_GrossLock(dev); nFreeChunks = yaffs_GetNumberOfFreeChunks(dev); yaffs_GrossUnlock(dev); return (nFreeChunks > 20) ? 1 : 0; } static void yaffs_release_space(struct file *f) { yaffs_Object *obj; yaffs_Device *dev; obj = yaffs_DentryToObject(f->f_dentry); dev = obj->myDev; yaffs_GrossLock(dev); yaffs_GrossUnlock(dev); } static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir) { yaffs_Object *obj; yaffs_Device *dev; struct inode *inode = f->f_dentry->d_inode; unsigned long offset, curoffs; struct ylist_head *i; yaffs_Object *l; char name[YAFFS_MAX_NAME_LENGTH + 1]; obj = yaffs_DentryToObject(f->f_dentry); dev = obj->myDev; yaffs_GrossLock(dev); offset = f->f_pos; T(YAFFS_TRACE_OS, ("yaffs_readdir: starting at %d\n", (int)offset)); if (offset == 0) { T(YAFFS_TRACE_OS, ("yaffs_readdir: entry . ino %d \n", (int)inode->i_ino)); if (filldir(dirent, ".", 1, offset, inode->i_ino, DT_DIR) < 0) goto out; offset++; f->f_pos++; } if (offset == 1) { T(YAFFS_TRACE_OS, ("yaffs_readdir: entry .. ino %d \n", (int)f->f_dentry->d_parent->d_inode->i_ino)); if (filldir(dirent, "..", 2, offset, f->f_dentry->d_parent->d_inode->i_ino, DT_DIR) < 0) goto out; 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; } ylist_for_each(i, &obj->variant.directoryVariant.children) { curoffs++; if (curoffs >= offset) { l = ylist_entry(i, yaffs_Object, siblings); yaffs_GetObjectName(l, name, YAFFS_MAX_NAME_LENGTH + 1); T(YAFFS_TRACE_OS, ("yaffs_readdir: %s inode %d\n", name, yaffs_GetObjectInode(l))); if (filldir(dirent, name, strlen(name), offset, yaffs_GetObjectInode(l), yaffs_GetObjectType(l)) < 0) goto up_and_out; offset++; f->f_pos++; } } up_and_out: out: yaffs_GrossUnlock(dev); return 0; } /* * 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; yaffs_Object *obj = NULL; yaffs_Device *dev; yaffs_Object *parent = yaffs_InodeToObject(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, ("yaffs_mknod: parent object %d type %d\n", parent->objectId, parent->variantType)); } else { T(YAFFS_TRACE_OS, ("yaffs_mknod: could not get parent object\n")); return -EPERM; } T(YAFFS_TRACE_OS, ("yaffs_mknod: making oject for %s, " "mode %x dev %x\n", dentry->d_name.name, mode, rdev)); dev = parent->myDev; yaffs_GrossLock(dev); switch (mode & S_IFMT) { default: /* Special (socket, fifo, device...) */ T(YAFFS_TRACE_OS, ("yaffs_mknod: making special\n")); obj = yaffs_MknodSpecial(parent, dentry->d_name.name, mode, uid, gid, old_encode_dev(rdev)); break; case S_IFREG: /* file */ T(YAFFS_TRACE_OS, ("yaffs_mknod: making file\n")); obj = yaffs_MknodFile(parent, dentry->d_name.name, mode, uid, gid); break; case S_IFDIR: /* directory */ T(YAFFS_TRACE_OS, ("yaffs_mknod: making directory\n")); obj = yaffs_MknodDirectory(parent, dentry->d_name.name, mode, uid, gid); break; case S_IFLNK: /* symlink */ T(YAFFS_TRACE_OS, ("yaffs_mknod: making symlink\n")); obj = NULL; /* Do we ever get here? */ break; } /* Can not call yaffs_get_inode() with gross lock held */ yaffs_GrossUnlock(dev); if (obj) { inode = yaffs_get_inode(dir->i_sb, mode, rdev, obj); d_instantiate(dentry, inode); T(YAFFS_TRACE_OS, ("yaffs_mknod created object %d count = %d\n", obj->objectId, atomic_read(&inode->i_count))); error = 0; } else { T(YAFFS_TRACE_OS, ("yaffs_mknod failed making object\n")); error = -ENOMEM; } return error; } static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode) { int retVal; T(YAFFS_TRACE_OS, ("yaffs_mkdir\n")); retVal = yaffs_mknod(dir, dentry, mode | S_IFDIR, 0); return retVal; } static int yaffs_create(struct inode *dir, struct dentry *dentry, umode_t mode, bool excl) { T(YAFFS_TRACE_OS, ("yaffs_create\n")); return yaffs_mknod(dir, dentry, mode | S_IFREG, 0); } static int yaffs_unlink(struct inode *dir, struct dentry *dentry) { int retVal; yaffs_Device *dev; T(YAFFS_TRACE_OS, ("yaffs_unlink %d:%s\n", (int)(dir->i_ino), dentry->d_name.name)); dev = yaffs_InodeToObject(dir)->myDev; yaffs_GrossLock(dev); retVal = yaffs_Unlink(yaffs_InodeToObject(dir), dentry->d_name.name); if (retVal == YAFFS_OK) { dentry->d_inode->i_nlink--; dir->i_version++; yaffs_GrossUnlock(dev); mark_inode_dirty(dentry->d_inode); return 0; } yaffs_GrossUnlock(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; yaffs_Object *obj = NULL; yaffs_Object *link = NULL; yaffs_Device *dev; T(YAFFS_TRACE_OS, ("yaffs_link\n")); obj = yaffs_InodeToObject(inode); dev = obj->myDev; yaffs_GrossLock(dev); if (!S_ISDIR(inode->i_mode)) /* Don't link directories */ link = yaffs_Link(yaffs_InodeToObject(dir), dentry->d_name.name, obj); if (link) { old_dentry->d_inode->i_nlink = yaffs_GetObjectLinkCount(obj); d_instantiate(dentry, old_dentry->d_inode); atomic_inc(&old_dentry->d_inode->i_count); T(YAFFS_TRACE_OS, ("yaffs_link link count %d i_count %d\n", old_dentry->d_inode->i_nlink, atomic_read(&old_dentry->d_inode->i_count))); } yaffs_GrossUnlock(dev); if (link) return 0; return -EPERM; } static int yaffs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) { yaffs_Object *obj; yaffs_Device *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, ("yaffs_symlink\n")); dev = yaffs_InodeToObject(dir)->myDev; yaffs_GrossLock(dev); obj = yaffs_MknodSymLink(yaffs_InodeToObject(dir), dentry->d_name.name, S_IFLNK | S_IRWXUGO, uid, gid, symname); yaffs_GrossUnlock(dev); if (obj) { struct inode *inode; inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj); d_instantiate(dentry, inode); T(YAFFS_TRACE_OS, ("symlink created OK\n")); return 0; } else { T(YAFFS_TRACE_OS, ("symlink not created\n")); } return -ENOMEM; } static int yaffs_sync_object(struct file *file, struct dentry *dentry, int datasync) { yaffs_Object *obj; yaffs_Device *dev; obj = yaffs_DentryToObject(dentry); dev = obj->myDev; T(YAFFS_TRACE_OS, ("yaffs_sync_object\n")); yaffs_GrossLock(dev); yaffs_FlushFile(obj, 1); yaffs_GrossUnlock(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) { yaffs_Device *dev; int retVal = YAFFS_FAIL; yaffs_Object *target; T(YAFFS_TRACE_OS, ("yaffs_rename\n")); dev = yaffs_InodeToObject(old_dir)->myDev; yaffs_GrossLock(dev); /* Check if the target is an existing directory that is not empty. */ target = yaffs_FindObjectByName(yaffs_InodeToObject(new_dir), new_dentry->d_name.name); if (target && target->variantType == YAFFS_OBJECT_TYPE_DIRECTORY && !ylist_empty(&target->variant.directoryVariant.children)) { T(YAFFS_TRACE_OS, ("target is non-empty dir\n")); retVal = YAFFS_FAIL; } else { /* Now does unlinking internally using shadowing mechanism */ T(YAFFS_TRACE_OS, ("calling yaffs_RenameObject\n")); retVal = yaffs_RenameObject(yaffs_InodeToObject(old_dir), old_dentry->d_name.name, yaffs_InodeToObject(new_dir), new_dentry->d_name.name); } yaffs_GrossUnlock(dev); if (retVal == YAFFS_OK) { if (target) { new_dentry->d_inode->i_nlink--; mark_inode_dirty(new_dentry->d_inode); } return 0; } else { return -ENOTEMPTY; } } static int yaffs_setattr(struct dentry *dentry, struct iattr *attr) { struct inode *inode = dentry->d_inode; int error; yaffs_Device *dev; T(YAFFS_TRACE_OS, ("yaffs_setattr of object %d\n", yaffs_InodeToObject(inode)->objectId)); error = inode_change_ok(inode, attr); if (error == 0) { dev = yaffs_InodeToObject(inode)->myDev; yaffs_GrossLock(dev); if (yaffs_SetAttributes(yaffs_InodeToObject(inode), attr) == YAFFS_OK) { error = 0; } else { error = -EPERM; } yaffs_GrossUnlock(dev); if (!error) error = inode_setattr(inode, attr); } return error; } static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf) { yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev; struct super_block *sb = dentry->d_sb; T(YAFFS_TRACE_OS, ("yaffs_statfs\n")); yaffs_GrossLock(dev); buf->f_type = YAFFS_MAGIC; buf->f_bsize = sb->s_blocksize; buf->f_namelen = 255; if (dev->nDataBytesPerChunk & (dev->nDataBytesPerChunk - 1)) { /* Do this if chunk size is not a power of 2 */ uint64_t bytesInDev; uint64_t bytesFree; bytesInDev = ((uint64_t)((dev->endBlock - dev->startBlock + 1))) * ((uint64_t)(dev->nChunksPerBlock * dev->nDataBytesPerChunk)); do_div(bytesInDev, sb->s_blocksize); /* bytesInDev becomes the number of blocks */ buf->f_blocks = bytesInDev; bytesFree = ((uint64_t)(yaffs_GetNumberOfFreeChunks(dev))) * ((uint64_t)(dev->nDataBytesPerChunk)); do_div(bytesFree, sb->s_blocksize); buf->f_bfree = bytesFree; } else if (sb->s_blocksize > dev->nDataBytesPerChunk) { buf->f_blocks = (dev->endBlock - dev->startBlock + 1) * dev->nChunksPerBlock / (sb->s_blocksize / dev->nDataBytesPerChunk); buf->f_bfree = yaffs_GetNumberOfFreeChunks(dev) / (sb->s_blocksize / dev->nDataBytesPerChunk); } else { buf->f_blocks = (dev->endBlock - dev->startBlock + 1) * dev->nChunksPerBlock * (dev->nDataBytesPerChunk / sb->s_blocksize); buf->f_bfree = yaffs_GetNumberOfFreeChunks(dev) * (dev->nDataBytesPerChunk / sb->s_blocksize); } buf->f_files = 0; buf->f_ffree = 0; buf->f_bavail = buf->f_bfree; yaffs_GrossUnlock(dev); return 0; } static int yaffs_do_sync_fs(struct super_block *sb) { yaffs_Device *dev = yaffs_SuperToDevice(sb); T(YAFFS_TRACE_OS, ("yaffs_do_sync_fs\n")); if (sb->s_dirt) { yaffs_GrossLock(dev); if (dev) { yaffs_FlushEntireDeviceCache(dev); yaffs_CheckpointSave(dev); } yaffs_GrossUnlock(dev); sb->s_dirt = 0; } return 0; } static void yaffs_write_super(struct super_block *sb) { T(YAFFS_TRACE_OS, ("yaffs_write_super\n")); if (yaffs_auto_checkpoint >= 2) yaffs_do_sync_fs(sb); } static int yaffs_sync_fs(struct super_block *sb, int wait) { T(YAFFS_TRACE_OS, ("yaffs_sync_fs\n")); if (yaffs_auto_checkpoint >= 1) yaffs_do_sync_fs(sb); return 0; } #ifdef YAFFS_USE_OWN_IGET static struct inode *yaffs_iget(struct super_block *sb, unsigned long ino) { struct inode *inode; yaffs_Object *obj; yaffs_Device *dev = yaffs_SuperToDevice(sb); T(YAFFS_TRACE_OS, ("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_GrossLock(dev); obj = yaffs_FindObjectByNumber(dev, inode->i_ino); yaffs_FillInodeFromObject(inode, obj); yaffs_GrossUnlock(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. */ yaffs_Object *obj; yaffs_Device *dev = yaffs_SuperToDevice(inode->i_sb); T(YAFFS_TRACE_OS, ("yaffs_read_inode for %d\n", (int)inode->i_ino)); yaffs_GrossLock(dev); obj = yaffs_FindObjectByNumber(dev, inode->i_ino); yaffs_FillInodeFromObject(inode, obj); yaffs_GrossUnlock(dev); } #endif static YLIST_HEAD(yaffs_dev_list); #if 0 /* not used */ static int yaffs_remount_fs(struct super_block *sb, int *flags, char *data) { yaffs_Device *dev = yaffs_SuperToDevice(sb); if (*flags & MS_RDONLY) { struct mtd_info *mtd = yaffs_SuperToDevice(sb)->genericDevice; T(YAFFS_TRACE_OS, ("yaffs_remount_fs: %s: RO\n", dev->name)); yaffs_GrossLock(dev); yaffs_FlushEntireDeviceCache(dev); yaffs_CheckpointSave(dev); if (mtd->sync) mtd->sync(mtd); yaffs_GrossUnlock(dev); } else { T(YAFFS_TRACE_OS, ("yaffs_remount_fs: %s: RW\n", dev->name)); } return 0; } #endif static void yaffs_put_super(struct super_block *sb) { yaffs_Device *dev = yaffs_SuperToDevice(sb); T(YAFFS_TRACE_OS, ("yaffs_put_super\n")); yaffs_GrossLock(dev); yaffs_FlushEntireDeviceCache(dev); yaffs_CheckpointSave(dev); if (dev->putSuperFunc) dev->putSuperFunc(sb); yaffs_Deinitialise(dev); yaffs_GrossUnlock(dev); /* we assume this is protected by lock_kernel() in mount/umount */ ylist_del(&dev->devList); if (dev->spareBuffer) { YFREE(dev->spareBuffer); dev->spareBuffer = NULL; } kfree(dev); } static void yaffs_MTDPutSuper(struct super_block *sb) { struct mtd_info *mtd = yaffs_SuperToDevice(sb)->genericDevice; if (mtd->sync) mtd->sync(mtd); put_mtd_device(mtd); } static void yaffs_MarkSuperBlockDirty(void *vsb) { struct super_block *sb = (struct super_block *)vsb; T(YAFFS_TRACE_OS, ("yaffs_MarkSuperBlockDirty() sb = %p\n", sb)); if (sb) sb->s_dirt = 1; } typedef struct { int inband_tags; int skip_checkpoint_read; int skip_checkpoint_write; int no_cache; } yaffs_options; #define MAX_OPT_LEN 20 static int yaffs_parse_options(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 != ',') { 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, "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 yaffsVersion, struct super_block *sb, void *data, int silent) { int nBlocks; struct inode *inode = NULL; struct dentry *root; yaffs_Device *dev = 0; char devname_buf[BDEVNAME_SIZE + 1]; struct mtd_info *mtd; int err; char *data_str = (char *)data; yaffs_options options; sb->s_magic = YAFFS_MAGIC; sb->s_op = &yaffs_super_ops; sb->s_flags |= MS_NOATIME; 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\"\n", sb->s_dev, yaffs_devname(sb, devname_buf)); 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, ("yaffs_read_super: Using yaffs%d\n", yaffsVersion)); T(YAFFS_TRACE_OS, ("yaffs_read_super: block size %d\n", (int)(sb->s_blocksize))); #ifdef CONFIG_YAFFS_DISABLE_WRITE_VERIFY T(YAFFS_TRACE_OS, ("yaffs: Write verification disabled. All guarantees " "null and void\n")); #endif T(YAFFS_TRACE_ALWAYS, ("yaffs: Attempting MTD mount on %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, ("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, ("yaffs: MTD device is not NAND it's type %d\n", mtd->type)); return NULL; } T(YAFFS_TRACE_OS, (" erase %p\n", mtd->erase)); T(YAFFS_TRACE_OS, (" read %p\n", mtd->read)); T(YAFFS_TRACE_OS, (" write %p\n", mtd->write)); T(YAFFS_TRACE_OS, (" readoob %p\n", mtd->read_oob)); T(YAFFS_TRACE_OS, (" writeoob %p\n", mtd->write_oob)); T(YAFFS_TRACE_OS, (" block_isbad %p\n", mtd->block_isbad)); T(YAFFS_TRACE_OS, (" block_markbad %p\n", mtd->block_markbad)); T(YAFFS_TRACE_OS, (" %s %d\n", WRITE_SIZE_STR, WRITE_SIZE(mtd))); T(YAFFS_TRACE_OS, (" oobsize %d\n", mtd->oobsize)); T(YAFFS_TRACE_OS, (" erasesize %d\n", mtd->erasesize)); T(YAFFS_TRACE_OS, (" size %lld\n", mtd->size)); #ifdef CONFIG_YAFFS_AUTO_YAFFS2 if (yaffsVersion == 1 && WRITE_SIZE(mtd) >= 2048) { T(YAFFS_TRACE_ALWAYS, ("yaffs: auto selecting yaffs2\n")); yaffsVersion = 2; } /* Added NCB 26/5/2006 for completeness */ if (yaffsVersion == 2 && !options.inband_tags && WRITE_SIZE(mtd) == 512) { T(YAFFS_TRACE_ALWAYS, ("yaffs: auto selecting yaffs1\n")); yaffsVersion = 1; } #endif if (yaffsVersion == 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, ("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, ("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, ("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, ("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 yaffs_Device up for mtd */ sb->s_fs_info = dev = kmalloc(sizeof(yaffs_Device), GFP_KERNEL); if (!dev) { /* Deep shit could not allocate device structure */ T(YAFFS_TRACE_ALWAYS, ("yaffs_read_super: Failed trying to allocate " "yaffs_Device. \n")); return NULL; } memset(dev, 0, sizeof(yaffs_Device)); dev->genericDevice = mtd; dev->name = mtd->name; /* Set up the memory size parameters.... */ nBlocks = YCALCBLOCKS(mtd->size, (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK)); dev->startBlock = 0; dev->endBlock = nBlocks - 1; dev->nChunksPerBlock = YAFFS_CHUNKS_PER_BLOCK; dev->totalBytesPerChunk = YAFFS_BYTES_PER_CHUNK; dev->nReservedBlocks = 5; dev->nShortOpCaches = (options.no_cache) ? 0 : 10; dev->inbandTags = options.inband_tags; /* ... and the functions. */ if (yaffsVersion == 2) { dev->writeChunkWithTagsToNAND = nandmtd2_WriteChunkWithTagsToNAND; dev->readChunkWithTagsFromNAND = nandmtd2_ReadChunkWithTagsFromNAND; dev->markNANDBlockBad = nandmtd2_MarkNANDBlockBad; dev->queryNANDBlock = nandmtd2_QueryNANDBlock; dev->spareBuffer = YMALLOC(mtd->oobsize); dev->isYaffs2 = 1; dev->totalBytesPerChunk = mtd->writesize; dev->nChunksPerBlock = mtd->erasesize / mtd->writesize; nBlocks = YCALCBLOCKS(mtd->size, mtd->erasesize); dev->startBlock = 0; dev->endBlock = nBlocks - 1; } else { /* use the MTD interface in yaffs_mtdif1.c */ dev->writeChunkWithTagsToNAND = nandmtd1_WriteChunkWithTagsToNAND; dev->readChunkWithTagsFromNAND = nandmtd1_ReadChunkWithTagsFromNAND; dev->markNANDBlockBad = nandmtd1_MarkNANDBlockBad; dev->queryNANDBlock = nandmtd1_QueryNANDBlock; dev->isYaffs2 = 0; } /* ... and common functions */ dev->eraseBlockInNAND = nandmtd_EraseBlockInNAND; dev->initialiseNAND = nandmtd_InitialiseNAND; dev->putSuperFunc = yaffs_MTDPutSuper; dev->superBlock = (void *)sb; dev->markSuperBlockDirty = yaffs_MarkSuperBlockDirty; #ifndef CONFIG_YAFFS_DOES_ECC dev->useNANDECC = 1; #endif #ifdef CONFIG_YAFFS_DISABLE_WIDE_TNODES dev->wideTnodesDisabled = 1; #endif dev->skipCheckpointRead = options.skip_checkpoint_read; dev->skipCheckpointWrite = options.skip_checkpoint_write; /* we assume this is protected by lock_kernel() in mount/umount */ ylist_add_tail(&dev->devList, &yaffs_dev_list); init_MUTEX(&dev->grossLock); yaffs_GrossLock(dev); err = yaffs_GutsInitialise(dev); T(YAFFS_TRACE_OS, ("yaffs_read_super: guts initialised %s\n", (err == YAFFS_OK) ? "OK" : "FAILED")); /* Release lock before yaffs_get_inode() */ yaffs_GrossUnlock(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, ("yaffs_read_super: got root inode\n")); root = d_alloc_root(inode); T(YAFFS_TRACE_OS, ("yaffs_read_super: d_alloc_root done\n")); if (!root) { iput(inode); return NULL; } sb->s_root = root; sb->s_dirt = !dev->isCheckpointed; T(YAFFS_TRACE_ALWAYS, ("yaffs_read_super: isCheckpointed %d\n", dev->isCheckpointed)); T(YAFFS_TRACE_OS, ("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(char *buf, yaffs_Device * dev) { buf += sprintf(buf, "startBlock......... %d\n", dev->startBlock); buf += sprintf(buf, "endBlock........... %d\n", dev->endBlock); buf += sprintf(buf, "totalBytesPerChunk. %d\n", dev->totalBytesPerChunk); buf += sprintf(buf, "nDataBytesPerChunk. %d\n", dev->nDataBytesPerChunk); buf += sprintf(buf, "chunkGroupBits..... %d\n", dev->chunkGroupBits); buf += sprintf(buf, "chunkGroupSize..... %d\n", dev->chunkGroupSize); buf += sprintf(buf, "nErasedBlocks...... %d\n", dev->nErasedBlocks); buf += sprintf(buf, "nReservedBlocks.... %d\n", dev->nReservedBlocks); buf += sprintf(buf, "blocksInCheckpoint. %d\n", dev->blocksInCheckpoint); buf += sprintf(buf, "nTnodesCreated..... %d\n", dev->nTnodesCreated); buf += sprintf(buf, "nFreeTnodes........ %d\n", dev->nFreeTnodes); buf += sprintf(buf, "nObjectsCreated.... %d\n", dev->nObjectsCreated); buf += sprintf(buf, "nFreeObjects....... %d\n", dev->nFreeObjects); buf += sprintf(buf, "nFreeChunks........ %d\n", dev->nFreeChunks); buf += sprintf(buf, "nPageWrites........ %d\n", dev->nPageWrites); buf += sprintf(buf, "nPageReads......... %d\n", dev->nPageReads); buf += sprintf(buf, "nBlockErasures..... %d\n", dev->nBlockErasures); buf += sprintf(buf, "nGCCopies.......... %d\n", dev->nGCCopies); buf += sprintf(buf, "garbageCollections. %d\n", dev->garbageCollections); buf += sprintf(buf, "passiveGCs......... %d\n", dev->passiveGarbageCollections); buf += sprintf(buf, "nRetriedWrites..... %d\n", dev->nRetriedWrites); buf += sprintf(buf, "nShortOpCaches..... %d\n", dev->nShortOpCaches); buf += sprintf(buf, "nRetireBlocks...... %d\n", dev->nRetiredBlocks); buf += sprintf(buf, "eccFixed........... %d\n", dev->eccFixed); buf += sprintf(buf, "eccUnfixed......... %d\n", dev->eccUnfixed); buf += sprintf(buf, "tagsEccFixed....... %d\n", dev->tagsEccFixed); buf += sprintf(buf, "tagsEccUnfixed..... %d\n", dev->tagsEccUnfixed); buf += sprintf(buf, "cacheHits.......... %d\n", dev->cacheHits); buf += sprintf(buf, "nDeletedFiles...... %d\n", dev->nDeletedFiles); buf += sprintf(buf, "nUnlinkedFiles..... %d\n", dev->nUnlinkedFiles); buf += sprintf(buf, "nBackgroudDeletions %d\n", dev->nBackgroundDeletions); buf += sprintf(buf, "useNANDECC......... %d\n", dev->useNANDECC); buf += sprintf(buf, "isYaffs2........... %d\n", dev->isYaffs2); buf += sprintf(buf, "inbandTags......... %d\n", dev->inbandTags); return buf; } static int yaffs_proc_read(char *page, char **start, off_t offset, int count, int *eof, void *data) { struct ylist_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 devList. * 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%s\n%s\n", yaffs_fs_c_version, yaffs_guts_c_version); } /* hold lock_kernel while traversing yaffs_dev_list */ lock_kernel(); /* Locate and print the Nth entry. Order N-squared but N is small. */ ylist_for_each(item, &yaffs_dev_list) { yaffs_Device *dev = ylist_entry(item, yaffs_Device, devList); if (n < step) { n++; continue; } buf += sprintf(buf, "\nDevice %d \"%s\"\n", n, dev->name); buf = yaffs_dump_dev(buf, dev); break; } unlock_kernel(); 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}, {"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}, {"mtd", YAFFS_TRACE_MTD}, {"nandaccess", YAFFS_TRACE_NANDACCESS}, {"os", YAFFS_TRACE_OS}, {"scan_debug", YAFFS_TRACE_SCAN_DEBUG}, {"scan", YAFFS_TRACE_SCAN}, {"tracing", YAFFS_TRACE_TRACING}, {"verify", YAFFS_TRACE_VERIFY}, {"verify_nand", YAFFS_TRACE_VERIFY_NAND}, {"verify_full", YAFFS_TRACE_VERIFY_FULL}, {"verify_all", YAFFS_TRACE_VERIFY_ALL}, {"write", YAFFS_TRACE_WRITE}, {"all", 0xffffffff}, {"none", 0}, {NULL, 0}, }; #define MAX_MASK_NAME_LENGTH 40 static int yaffs_proc_write(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_traceMask; 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_traceMask = rg | YAFFS_TRACE_ALWAYS; printk(KERN_DEBUG "new trace = 0x%08X\n", yaffs_traceMask); 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; } /* 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, ("yaffs " __DATE__ " " __TIME__ " Installing. \n")); /* Install the proc_fs entry */ 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, ("yaffs " __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., 2002-2006"); MODULE_LICENSE("GPL");