From 871480933a1c28f8a9fed4c4d34d06c439a7a422 Mon Sep 17 00:00:00 2001 From: Srikant Patnaik Date: Sun, 11 Jan 2015 12:28:04 +0530 Subject: Moved, renamed, and deleted files The original directory structure was scattered and unorganized. Changes are basically to make it look like kernel structure. --- ANDROID_3.4.5/fs/coda/dir.c | 646 -------------------------------------------- 1 file changed, 646 deletions(-) delete mode 100644 ANDROID_3.4.5/fs/coda/dir.c (limited to 'ANDROID_3.4.5/fs/coda/dir.c') diff --git a/ANDROID_3.4.5/fs/coda/dir.c b/ANDROID_3.4.5/fs/coda/dir.c deleted file mode 100644 index 17751582..00000000 --- a/ANDROID_3.4.5/fs/coda/dir.c +++ /dev/null @@ -1,646 +0,0 @@ - -/* - * Directory operations for Coda filesystem - * Original version: (C) 1996 P. Braam and M. Callahan - * Rewritten for Linux 2.1. (C) 1997 Carnegie Mellon University - * - * Carnegie Mellon encourages users to contribute improvements to - * the Coda project. Contact Peter Braam (coda@cs.cmu.edu). - */ - -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include - -#include -#include -#include "coda_linux.h" -#include "coda_cache.h" - -#include "coda_int.h" - -/* dir inode-ops */ -static int coda_create(struct inode *dir, struct dentry *new, umode_t mode, struct nameidata *nd); -static struct dentry *coda_lookup(struct inode *dir, struct dentry *target, struct nameidata *nd); -static int coda_link(struct dentry *old_dentry, struct inode *dir_inode, - struct dentry *entry); -static int coda_unlink(struct inode *dir_inode, struct dentry *entry); -static int coda_symlink(struct inode *dir_inode, struct dentry *entry, - const char *symname); -static int coda_mkdir(struct inode *dir_inode, struct dentry *entry, umode_t mode); -static int coda_rmdir(struct inode *dir_inode, struct dentry *entry); -static int coda_rename(struct inode *old_inode, struct dentry *old_dentry, - struct inode *new_inode, struct dentry *new_dentry); - -/* dir file-ops */ -static int coda_readdir(struct file *file, void *buf, filldir_t filldir); - -/* dentry ops */ -static int coda_dentry_revalidate(struct dentry *de, struct nameidata *nd); -static int coda_dentry_delete(const struct dentry *); - -/* support routines */ -static int coda_venus_readdir(struct file *coda_file, void *buf, - filldir_t filldir); - -/* same as fs/bad_inode.c */ -static int coda_return_EIO(void) -{ - return -EIO; -} -#define CODA_EIO_ERROR ((void *) (coda_return_EIO)) - -const struct dentry_operations coda_dentry_operations = -{ - .d_revalidate = coda_dentry_revalidate, - .d_delete = coda_dentry_delete, -}; - -const struct inode_operations coda_dir_inode_operations = -{ - .create = coda_create, - .lookup = coda_lookup, - .link = coda_link, - .unlink = coda_unlink, - .symlink = coda_symlink, - .mkdir = coda_mkdir, - .rmdir = coda_rmdir, - .mknod = CODA_EIO_ERROR, - .rename = coda_rename, - .permission = coda_permission, - .getattr = coda_getattr, - .setattr = coda_setattr, -}; - -const struct file_operations coda_dir_operations = { - .llseek = generic_file_llseek, - .read = generic_read_dir, - .readdir = coda_readdir, - .open = coda_open, - .release = coda_release, - .fsync = coda_fsync, -}; - - -/* inode operations for directories */ -/* access routines: lookup, readlink, permission */ -static struct dentry *coda_lookup(struct inode *dir, struct dentry *entry, struct nameidata *nd) -{ - struct super_block *sb = dir->i_sb; - const char *name = entry->d_name.name; - size_t length = entry->d_name.len; - struct inode *inode; - int type = 0; - - if (length > CODA_MAXNAMLEN) { - printk(KERN_ERR "name too long: lookup, %s (%*s)\n", - coda_i2s(dir), (int)length, name); - return ERR_PTR(-ENAMETOOLONG); - } - - /* control object, create inode on the fly */ - if (coda_isroot(dir) && coda_iscontrol(name, length)) { - inode = coda_cnode_makectl(sb); - type = CODA_NOCACHE; - } else { - struct CodaFid fid = { { 0, } }; - int error = venus_lookup(sb, coda_i2f(dir), name, length, - &type, &fid); - inode = !error ? coda_cnode_make(&fid, sb) : ERR_PTR(error); - } - - if (!IS_ERR(inode) && (type & CODA_NOCACHE)) - coda_flag_inode(inode, C_VATTR | C_PURGE); - - if (inode == ERR_PTR(-ENOENT)) - inode = NULL; - - return d_splice_alias(inode, entry); -} - - -int coda_permission(struct inode *inode, int mask) -{ - int error; - - if (mask & MAY_NOT_BLOCK) - return -ECHILD; - - mask &= MAY_READ | MAY_WRITE | MAY_EXEC; - - if (!mask) - return 0; - - if ((mask & MAY_EXEC) && !execute_ok(inode)) - return -EACCES; - - if (coda_cache_check(inode, mask)) - return 0; - - error = venus_access(inode->i_sb, coda_i2f(inode), mask); - - if (!error) - coda_cache_enter(inode, mask); - - return error; -} - - -static inline void coda_dir_update_mtime(struct inode *dir) -{ -#ifdef REQUERY_VENUS_FOR_MTIME - /* invalidate the directory cnode's attributes so we refetch the - * attributes from venus next time the inode is referenced */ - coda_flag_inode(dir, C_VATTR); -#else - /* optimistically we can also act as if our nose bleeds. The - * granularity of the mtime is coarse anyways so we might actually be - * right most of the time. Note: we only do this for directories. */ - dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC; -#endif -} - -/* we have to wrap inc_nlink/drop_nlink because sometimes userspace uses a - * trick to fool GNU find's optimizations. If we can't be sure of the link - * (because of volume mount points) we set i_nlink to 1 which forces find - * to consider every child as a possible directory. We should also never - * see an increment or decrement for deleted directories where i_nlink == 0 */ -static inline void coda_dir_inc_nlink(struct inode *dir) -{ - if (dir->i_nlink >= 2) - inc_nlink(dir); -} - -static inline void coda_dir_drop_nlink(struct inode *dir) -{ - if (dir->i_nlink > 2) - drop_nlink(dir); -} - -/* creation routines: create, mknod, mkdir, link, symlink */ -static int coda_create(struct inode *dir, struct dentry *de, umode_t mode, struct nameidata *nd) -{ - int error; - const char *name=de->d_name.name; - int length=de->d_name.len; - struct inode *inode; - struct CodaFid newfid; - struct coda_vattr attrs; - - if (coda_isroot(dir) && coda_iscontrol(name, length)) - return -EPERM; - - error = venus_create(dir->i_sb, coda_i2f(dir), name, length, - 0, mode, &newfid, &attrs); - if (error) - goto err_out; - - inode = coda_iget(dir->i_sb, &newfid, &attrs); - if (IS_ERR(inode)) { - error = PTR_ERR(inode); - goto err_out; - } - - /* invalidate the directory cnode's attributes */ - coda_dir_update_mtime(dir); - d_instantiate(de, inode); - return 0; -err_out: - d_drop(de); - return error; -} - -static int coda_mkdir(struct inode *dir, struct dentry *de, umode_t mode) -{ - struct inode *inode; - struct coda_vattr attrs; - const char *name = de->d_name.name; - int len = de->d_name.len; - int error; - struct CodaFid newfid; - - if (coda_isroot(dir) && coda_iscontrol(name, len)) - return -EPERM; - - attrs.va_mode = mode; - error = venus_mkdir(dir->i_sb, coda_i2f(dir), - name, len, &newfid, &attrs); - if (error) - goto err_out; - - inode = coda_iget(dir->i_sb, &newfid, &attrs); - if (IS_ERR(inode)) { - error = PTR_ERR(inode); - goto err_out; - } - - /* invalidate the directory cnode's attributes */ - coda_dir_inc_nlink(dir); - coda_dir_update_mtime(dir); - d_instantiate(de, inode); - return 0; -err_out: - d_drop(de); - return error; -} - -/* try to make de an entry in dir_inodde linked to source_de */ -static int coda_link(struct dentry *source_de, struct inode *dir_inode, - struct dentry *de) -{ - struct inode *inode = source_de->d_inode; - const char * name = de->d_name.name; - int len = de->d_name.len; - int error; - - if (coda_isroot(dir_inode) && coda_iscontrol(name, len)) - return -EPERM; - - error = venus_link(dir_inode->i_sb, coda_i2f(inode), - coda_i2f(dir_inode), (const char *)name, len); - if (error) { - d_drop(de); - return error; - } - - coda_dir_update_mtime(dir_inode); - ihold(inode); - d_instantiate(de, inode); - inc_nlink(inode); - return 0; -} - - -static int coda_symlink(struct inode *dir_inode, struct dentry *de, - const char *symname) -{ - const char *name = de->d_name.name; - int len = de->d_name.len; - int symlen; - int error; - - if (coda_isroot(dir_inode) && coda_iscontrol(name, len)) - return -EPERM; - - symlen = strlen(symname); - if (symlen > CODA_MAXPATHLEN) - return -ENAMETOOLONG; - - /* - * This entry is now negative. Since we do not create - * an inode for the entry we have to drop it. - */ - d_drop(de); - error = venus_symlink(dir_inode->i_sb, coda_i2f(dir_inode), name, len, - symname, symlen); - - /* mtime is no good anymore */ - if (!error) - coda_dir_update_mtime(dir_inode); - - return error; -} - -/* destruction routines: unlink, rmdir */ -static int coda_unlink(struct inode *dir, struct dentry *de) -{ - int error; - const char *name = de->d_name.name; - int len = de->d_name.len; - - error = venus_remove(dir->i_sb, coda_i2f(dir), name, len); - if (error) - return error; - - coda_dir_update_mtime(dir); - drop_nlink(de->d_inode); - return 0; -} - -static int coda_rmdir(struct inode *dir, struct dentry *de) -{ - const char *name = de->d_name.name; - int len = de->d_name.len; - int error; - - error = venus_rmdir(dir->i_sb, coda_i2f(dir), name, len); - if (!error) { - /* VFS may delete the child */ - if (de->d_inode) - clear_nlink(de->d_inode); - - /* fix the link count of the parent */ - coda_dir_drop_nlink(dir); - coda_dir_update_mtime(dir); - } - return error; -} - -/* rename */ -static int coda_rename(struct inode *old_dir, struct dentry *old_dentry, - struct inode *new_dir, struct dentry *new_dentry) -{ - const char *old_name = old_dentry->d_name.name; - const char *new_name = new_dentry->d_name.name; - int old_length = old_dentry->d_name.len; - int new_length = new_dentry->d_name.len; - int error; - - error = venus_rename(old_dir->i_sb, coda_i2f(old_dir), - coda_i2f(new_dir), old_length, new_length, - (const char *) old_name, (const char *)new_name); - if (!error) { - if (new_dentry->d_inode) { - if (S_ISDIR(new_dentry->d_inode->i_mode)) { - coda_dir_drop_nlink(old_dir); - coda_dir_inc_nlink(new_dir); - } - coda_dir_update_mtime(old_dir); - coda_dir_update_mtime(new_dir); - coda_flag_inode(new_dentry->d_inode, C_VATTR); - } else { - coda_flag_inode(old_dir, C_VATTR); - coda_flag_inode(new_dir, C_VATTR); - } - } - return error; -} - - -/* file operations for directories */ -static int coda_readdir(struct file *coda_file, void *buf, filldir_t filldir) -{ - struct coda_file_info *cfi; - struct file *host_file; - int ret; - - cfi = CODA_FTOC(coda_file); - BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC); - host_file = cfi->cfi_container; - - if (!host_file->f_op) - return -ENOTDIR; - - if (host_file->f_op->readdir) - { - /* potemkin case: we were handed a directory inode. - * We can't use vfs_readdir because we have to keep the file - * position in sync between the coda_file and the host_file. - * and as such we need grab the inode mutex. */ - struct inode *host_inode = host_file->f_path.dentry->d_inode; - - mutex_lock(&host_inode->i_mutex); - host_file->f_pos = coda_file->f_pos; - - ret = -ENOENT; - if (!IS_DEADDIR(host_inode)) { - ret = host_file->f_op->readdir(host_file, buf, filldir); - file_accessed(host_file); - } - - coda_file->f_pos = host_file->f_pos; - mutex_unlock(&host_inode->i_mutex); - } - else /* Venus: we must read Venus dirents from a file */ - ret = coda_venus_readdir(coda_file, buf, filldir); - - return ret; -} - -static inline unsigned int CDT2DT(unsigned char cdt) -{ - unsigned int dt; - - switch(cdt) { - case CDT_UNKNOWN: dt = DT_UNKNOWN; break; - case CDT_FIFO: dt = DT_FIFO; break; - case CDT_CHR: dt = DT_CHR; break; - case CDT_DIR: dt = DT_DIR; break; - case CDT_BLK: dt = DT_BLK; break; - case CDT_REG: dt = DT_REG; break; - case CDT_LNK: dt = DT_LNK; break; - case CDT_SOCK: dt = DT_SOCK; break; - case CDT_WHT: dt = DT_WHT; break; - default: dt = DT_UNKNOWN; break; - } - return dt; -} - -/* support routines */ -static int coda_venus_readdir(struct file *coda_file, void *buf, - filldir_t filldir) -{ - int result = 0; /* # of entries returned */ - struct coda_file_info *cfi; - struct coda_inode_info *cii; - struct file *host_file; - struct dentry *de; - struct venus_dirent *vdir; - unsigned long vdir_size = offsetof(struct venus_dirent, d_name); - unsigned int type; - struct qstr name; - ino_t ino; - int ret; - - cfi = CODA_FTOC(coda_file); - BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC); - host_file = cfi->cfi_container; - - de = coda_file->f_path.dentry; - cii = ITOC(de->d_inode); - - vdir = kmalloc(sizeof(*vdir), GFP_KERNEL); - if (!vdir) return -ENOMEM; - - if (coda_file->f_pos == 0) { - ret = filldir(buf, ".", 1, 0, de->d_inode->i_ino, DT_DIR); - if (ret < 0) - goto out; - result++; - coda_file->f_pos++; - } - if (coda_file->f_pos == 1) { - ret = filldir(buf, "..", 2, 1, parent_ino(de), DT_DIR); - if (ret < 0) - goto out; - result++; - coda_file->f_pos++; - } - while (1) { - /* read entries from the directory file */ - ret = kernel_read(host_file, coda_file->f_pos - 2, (char *)vdir, - sizeof(*vdir)); - if (ret < 0) { - printk(KERN_ERR "coda readdir: read dir %s failed %d\n", - coda_f2s(&cii->c_fid), ret); - break; - } - if (ret == 0) break; /* end of directory file reached */ - - /* catch truncated reads */ - if (ret < vdir_size || ret < vdir_size + vdir->d_namlen) { - printk(KERN_ERR "coda readdir: short read on %s\n", - coda_f2s(&cii->c_fid)); - ret = -EBADF; - break; - } - /* validate whether the directory file actually makes sense */ - if (vdir->d_reclen < vdir_size + vdir->d_namlen) { - printk(KERN_ERR "coda readdir: invalid dir %s\n", - coda_f2s(&cii->c_fid)); - ret = -EBADF; - break; - } - - name.len = vdir->d_namlen; - name.name = vdir->d_name; - - /* Make sure we skip '.' and '..', we already got those */ - if (name.name[0] == '.' && (name.len == 1 || - (vdir->d_name[1] == '.' && name.len == 2))) - vdir->d_fileno = name.len = 0; - - /* skip null entries */ - if (vdir->d_fileno && name.len) { - /* try to look up this entry in the dcache, that way - * userspace doesn't have to worry about breaking - * getcwd by having mismatched inode numbers for - * internal volume mountpoints. */ - ino = find_inode_number(de, &name); - if (!ino) ino = vdir->d_fileno; - - type = CDT2DT(vdir->d_type); - ret = filldir(buf, name.name, name.len, - coda_file->f_pos, ino, type); - /* failure means no space for filling in this round */ - if (ret < 0) break; - result++; - } - /* we'll always have progress because d_reclen is unsigned and - * we've already established it is non-zero. */ - coda_file->f_pos += vdir->d_reclen; - } -out: - kfree(vdir); - return result ? result : ret; -} - -/* called when a cache lookup succeeds */ -static int coda_dentry_revalidate(struct dentry *de, struct nameidata *nd) -{ - struct inode *inode; - struct coda_inode_info *cii; - - if (nd->flags & LOOKUP_RCU) - return -ECHILD; - - inode = de->d_inode; - if (!inode || coda_isroot(inode)) - goto out; - if (is_bad_inode(inode)) - goto bad; - - cii = ITOC(de->d_inode); - if (!(cii->c_flags & (C_PURGE | C_FLUSH))) - goto out; - - shrink_dcache_parent(de); - - /* propagate for a flush */ - if (cii->c_flags & C_FLUSH) - coda_flag_inode_children(inode, C_FLUSH); - - if (de->d_count > 1) - /* pretend it's valid, but don't change the flags */ - goto out; - - /* clear the flags. */ - spin_lock(&cii->c_lock); - cii->c_flags &= ~(C_VATTR | C_PURGE | C_FLUSH); - spin_unlock(&cii->c_lock); -bad: - return 0; -out: - return 1; -} - -/* - * This is the callback from dput() when d_count is going to 0. - * We use this to unhash dentries with bad inodes. - */ -static int coda_dentry_delete(const struct dentry * dentry) -{ - int flags; - - if (!dentry->d_inode) - return 0; - - flags = (ITOC(dentry->d_inode)->c_flags) & C_PURGE; - if (is_bad_inode(dentry->d_inode) || flags) { - return 1; - } - return 0; -} - - - -/* - * This is called when we want to check if the inode has - * changed on the server. Coda makes this easy since the - * cache manager Venus issues a downcall to the kernel when this - * happens - */ -int coda_revalidate_inode(struct dentry *dentry) -{ - struct coda_vattr attr; - int error; - int old_mode; - ino_t old_ino; - struct inode *inode = dentry->d_inode; - struct coda_inode_info *cii = ITOC(inode); - - if (!cii->c_flags) - return 0; - - if (cii->c_flags & (C_VATTR | C_PURGE | C_FLUSH)) { - error = venus_getattr(inode->i_sb, &(cii->c_fid), &attr); - if (error) - return -EIO; - - /* this inode may be lost if: - - it's ino changed - - type changes must be permitted for repair and - missing mount points. - */ - old_mode = inode->i_mode; - old_ino = inode->i_ino; - coda_vattr_to_iattr(inode, &attr); - - if ((old_mode & S_IFMT) != (inode->i_mode & S_IFMT)) { - printk("Coda: inode %ld, fid %s changed type!\n", - inode->i_ino, coda_f2s(&(cii->c_fid))); - } - - /* the following can happen when a local fid is replaced - with a global one, here we lose and declare the inode bad */ - if (inode->i_ino != old_ino) - return -EIO; - - coda_flag_inode_children(inode, C_FLUSH); - - spin_lock(&cii->c_lock); - cii->c_flags &= ~(C_VATTR | C_PURGE | C_FLUSH); - spin_unlock(&cii->c_lock); - } - return 0; -} -- cgit