From: Charles Manning Date: Tue, 30 Mar 2010 01:42:21 +0000 (+1300) Subject: Add nfs support. X-Git-Tag: pre-name-change~90 X-Git-Url: http://www.aleph1.co.uk/gitweb/?p=yaffs2.git;a=commitdiff_plain;h=f9cb4ba6cdd270bf21d76dcb8e8381a9c143f670;hp=03c76f6c10acaf6b8fe36e663abd9a87cf76b9de Add nfs support. This is a modified version of the patch suplied by Jean-Loup Sabatier Signed-off-by: Charles Manning --- diff --git a/yaffs_fs.c b/yaffs_fs.c index 69b739b..95538ab 100644 --- a/yaffs_fs.c +++ b/yaffs_fs.c @@ -56,6 +56,7 @@ extern const char *yaffs_guts_c_version; #include #include #include +#include #ifdef YAFFS_COMPILE_BACKGROUND #include @@ -286,6 +287,7 @@ static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd); #else static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd); #endif +static loff_t yaffs_dir_llseek(struct file *file, loff_t offset, int origin); static struct address_space_operations yaffs_file_address_operations = { .readpage = yaffs_readpage, @@ -378,6 +380,7 @@ static const struct file_operations yaffs_dir_operations = { .read = generic_read_dir, .readdir = yaffs_readdir, .fsync = yaffs_sync_object, + .llseek = yaffs_dir_llseek, }; static const struct super_operations yaffs_super_ops = { @@ -415,6 +418,72 @@ static void yaffs_GrossUnlock(yaffs_Device *dev) } + +static struct inode * +yaffs2_nfs_get_inode(struct super_block *sb, uint64_t ino, uint32_t generation) +{ + return yaffs_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; + yaffs_Object *d_obj; + yaffs_Object *parent_obj; + + d_obj = yaffs_InodeToObject(dentry->d_inode); + + if (d_obj) { + parent_obj = d_obj->parent; + if (parent_obj) { + parent_ino = yaffs_GetObjectInode(parent_obj); + inode = yaffs_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; +} + +#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,9)) +/* Just declare a zero structure as a NULL value implies + * using the default functions of expfs. + */ + +static struct export_operations yaffs_export_ops = +{ + .fh_to_dentry = yaffs2_fh_to_dentry, + .fh_to_parent = yaffs2_fh_to_parent, + .get_parent = yaffs2_get_parent, +} ; + +#endif + /*-----------------------------------------------------------------*/ /* Directory search context allows us to unlock access to yaffs during * filldir without causing problems with the directory being modified. @@ -602,7 +671,8 @@ static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry) yaffs_Device *dev = yaffs_InodeToObject(dir)->myDev; - yaffs_GrossLock(dev); + if(current != yaffs_DeviceToContext(dev)->readdirProcess) + yaffs_GrossLock(dev); T(YAFFS_TRACE_OS, ("yaffs_lookup for %d:%s\n", @@ -614,7 +684,8 @@ static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry) obj = yaffs_GetEquivalentObject(obj); /* in case it was a hardlink */ /* Can't hold gross lock when calling yaffs_get_inode() */ - yaffs_GrossUnlock(dev); + if(current != yaffs_DeviceToContext(dev)->readdirProcess) + yaffs_GrossUnlock(dev); if (obj) { T(YAFFS_TRACE_OS, @@ -1287,6 +1358,33 @@ static void yaffs_release_space(struct file *f) yaffs_GrossUnlock(dev); } + +static loff_t yaffs_dir_llseek(struct file *file, loff_t offset, int origin) +{ + long long retval; + + lock_kernel(); + + switch (origin){ + case 2: + offset += i_size_read(file->f_path.dentry->d_inode); + break; + case 1: + offset += file->f_pos; + } + retval = -EINVAL; + + if (offset >= 0){ + if (offset != file->f_pos) + file->f_pos = offset; + + retval = offset; + } + unlock_kernel(); + return retval; +} + + static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir) { yaffs_Object *obj; @@ -1304,6 +1402,8 @@ static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir) yaffs_GrossLock(dev); + yaffs_DeviceToContext(dev)->readdirProcess = current; + offset = f->f_pos; sc = yaffs_NewSearch(obj); @@ -1342,12 +1442,13 @@ static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir) /* If the directory has changed since the open or last call to readdir, rewind to after the 2 canned entries. */ - +#if 0 /* For exportfs patch */ if (f->f_version != inode->i_version) { offset = 2; f->f_pos = offset; f->f_version = inode->i_version; } +#endif while(sc->nextReturn){ curoffs++; @@ -1381,6 +1482,8 @@ static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir) } unlock_out: + yaffs_DeviceToContext(dev)->readdirProcess = NULL; + yaffs_GrossUnlock(dev); out: yaffs_EndSearch(sc); @@ -1388,6 +1491,8 @@ out: return retVal; } + + /* * File creation. Allocate an inode, and we're done.. */ @@ -1478,6 +1583,7 @@ static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode, ("yaffs_mknod created object %d count = %d\n", obj->objectId, atomic_read(&inode->i_count))); error = 0; + yaffs_FillInodeFromObject(dir,parent); } else { T(YAFFS_TRACE_OS, ("yaffs_mknod failed making object\n")); @@ -1511,16 +1617,17 @@ static int yaffs_unlink(struct inode *dir, struct dentry *dentry) int retVal; yaffs_Device *dev; + yaffs_Object *obj; T(YAFFS_TRACE_OS, ("yaffs_unlink %d:%s\n", (int)(dir->i_ino), dentry->d_name.name)); - - dev = yaffs_InodeToObject(dir)->myDev; + obj = yaffs_InodeToObject(dir); + dev = obj->myDev; yaffs_GrossLock(dev); - retVal = yaffs_Unlink(yaffs_InodeToObject(dir), dentry->d_name.name); + retVal = yaffs_Unlink(obj, dentry->d_name.name); if (retVal == YAFFS_OK) { dentry->d_inode->i_nlink--; @@ -2005,13 +2112,15 @@ static void yaffs_read_inode(struct inode *inode) T(YAFFS_TRACE_OS, ("yaffs_read_inode for %d\n", (int)inode->i_ino)); - yaffs_GrossLock(dev); + if(current != yaffs_DeviceToContext(dev)->readdirProcess) + yaffs_GrossLock(dev); obj = yaffs_FindObjectByNumber(dev, inode->i_ino); yaffs_FillInodeFromObject(inode, obj); - yaffs_GrossUnlock(dev); + if(current != yaffs_DeviceToContext(dev)->readdirProcess) + yaffs_GrossUnlock(dev); } #endif @@ -2196,6 +2305,10 @@ static struct super_block *yaffs_internal_read_super(int yaffsVersion, sb->s_op = &yaffs_super_ops; sb->s_flags |= MS_NOATIME; +#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,9)) + sb->s_export_op = &yaffs_export_ops; +#endif + if (!sb) printk(KERN_INFO "yaffs: sb is NULL\n"); else if (!sb->s_dev) diff --git a/yaffs_linux.h b/yaffs_linux.h index 54556e0..f18c697 100644 --- a/yaffs_linux.h +++ b/yaffs_linux.h @@ -32,6 +32,8 @@ struct yaffs_LinuxContext { struct mtd_info *mtd; struct ylist_head searchContexts; void (*putSuperFunc)(struct super_block *sb); + + struct task_struct *readdirProcess; }; #define yaffs_DeviceToContext(dev) ((struct yaffs_LinuxContext *)((dev)->context))