/* * Create the EMD file for a directory if it doesn't * already exist. Returns 0 or an error code. * * Note: the caller must hold a lock on the parent directory. */ int umsdos_make_emd(struct dentry *parent) { struct dentry *demd = umsdos_get_emd_dentry(parent); int err = PTR_ERR(demd); if (IS_ERR(demd)) { printk("umsdos_make_emd: can't get dentry in %s, err=%d\n", parent->d_name.name, err); goto out; } /* already created? */ err = 0; if (demd->d_inode) goto out_set; Printk(("umsdos_make_emd: creating EMD %s/%s\n", parent->d_name.name, demd->d_name.name)); err = msdos_create(parent->d_inode, demd, S_IFREG | 0777); if (err) { printk (KERN_WARNING "umsdos_make_emd: create %s/%s failed, err=%d\n", parent->d_name.name, demd->d_name.name, err); goto out_dput; } out_set: parent->d_inode->u.umsdos_i.i_emd_dir = demd->d_inode->i_ino; out_dput: dput(demd); out: return err; }
/* * Check whether a directory has an EMD file. * * Note: the caller must hold a lock on the parent directory. */ int umsdos_have_emd(struct dentry *dir) { struct dentry *demd = umsdos_get_emd_dentry (dir); int found = 0; if (!IS_ERR(demd)) { if (demd->d_inode) found = 1; dput(demd); } return found; }
/* #Specification: pseudo root / rmdir /DOS * The pseudo sub-directory /DOS can't be removed! * This is done even if the pseudo root is not a Umsdos * directory anymore (very unlikely), but an accident (under * MS-DOS) is always possible. * * EPERM is returned. */ static int UMSDOS_rrmdir ( struct inode *dir, struct dentry *dentry) { int ret, empty; ret = -EPERM; if (umsdos_is_pseudodos (dir, dentry)) goto out; ret = -EBUSY; if (!d_unhashed(dentry)) goto out; ret = msdos_rmdir (dir, dentry); if (ret != -ENOTEMPTY) goto out; empty = umsdos_isempty (dentry); if (empty == 1) { struct dentry *demd; /* We have to remove the EMD file. */ demd = umsdos_get_emd_dentry(dentry); ret = PTR_ERR(demd); if (!IS_ERR(demd)) { ret = 0; if (demd->d_inode) ret = msdos_unlink (dentry->d_inode, demd); if (!ret) d_delete(demd); dput(demd); } } if (ret) goto out; /* now retry the original ... */ ret = msdos_rmdir (dir, dentry); out: return ret; }
int umsdos_isempty (struct dentry *dentry) { struct dentry *demd; int ret = 2; struct file filp; demd = umsdos_get_emd_dentry(dentry); if (IS_ERR(demd)) goto out; /* If the EMD file does not exist, it is certainly empty. :-) */ if (!demd->d_inode) goto out_dput; fill_new_filp (&filp, demd); filp.f_flags = O_RDONLY; ret = 1; while (filp.f_pos < demd->d_inode->i_size) { struct umsdos_dirent entry; if (umsdos_emd_dir_readentry (&filp, &entry) != 0) { ret = 0; break; } if (entry.name_len != 0) { ret = 0; break; } } out_dput: dput(demd); out: Printk(("umsdos_isempty: checked %s/%s, empty=%d\n", dentry->d_parent->d_name.name, dentry->d_name.name, ret)); return ret; }
/* #Specification: ioctl / prototypes * The official prototype for the umsdos ioctl on directory * is: * * int ioctl ( * int fd, // File handle of the directory * int cmd, // command * struct umsdos_ioctl *data) * * The struct and the commands are defined in linux/umsdos_fs.h. * * umsdos_progs/umsdosio.c provide an interface in C++ to all * these ioctl. umsdos_progs/udosctl is a small utility showing * all this. * * These ioctl generally allow one to work on the EMD or the * DOS directory independently. These are essential to implement * the synchronise. */ int UMSDOS_ioctl_dir(struct inode *dir, struct file *filp, unsigned int cmd, unsigned long data_ptr) { struct dentry *dentry = filp->f_dentry; struct umsdos_ioctl *idata = (struct umsdos_ioctl *) data_ptr; int ret; struct file new_filp; struct umsdos_ioctl data; Printk(("UMSDOS_ioctl_dir: %s/%s, cmd=%d, data=%08lx\n", dentry->d_parent->d_name.name, dentry->d_name.name, cmd, data_ptr)); /* forward non-umsdos ioctls - this hopefully doesn't cause conflicts */ if (cmd != UMSDOS_GETVERSION && cmd != UMSDOS_READDIR_DOS && cmd != UMSDOS_READDIR_EMD && cmd != UMSDOS_INIT_EMD && cmd != UMSDOS_CREAT_EMD && cmd != UMSDOS_RENAME_DOS && cmd != UMSDOS_UNLINK_EMD && cmd != UMSDOS_UNLINK_DOS && cmd != UMSDOS_RMDIR_DOS && cmd != UMSDOS_STAT_DOS && cmd != UMSDOS_DOS_SETUP) return fat_dir_ioctl (dir, filp, cmd, data_ptr); /* #Specification: ioctl / acces * Only root (effective id) is allowed to do IOCTL on directory * in UMSDOS. EPERM is returned for other user. */ /* * Well, not all cases require write access, but it simplifies * the code, and let's face it, there is only one client (umssync) * for all this. */ ret = verify_area (VERIFY_WRITE, (void *) data_ptr, sizeof (struct umsdos_ioctl)); if (ret < 0) goto out; ret = -EPERM; if (current->euid != 0 && cmd != UMSDOS_GETVERSION) goto out; ret = -EINVAL; if (cmd == UMSDOS_GETVERSION) { /* #Specification: ioctl / UMSDOS_GETVERSION * The field version and release of the structure * umsdos_ioctl are filled with the version and release * number of the fs code in the kernel. This will allow * some form of checking. Users won't be able to run * incompatible utility such as the synchroniser (umssync). * umsdos_progs/umsdosio.c enforce this checking. * * Return always 0. */ put_user (UMSDOS_VERSION, &idata->version); put_user (UMSDOS_RELEASE, &idata->release); ret = 0; goto out; } if (cmd == UMSDOS_READDIR_DOS) { /* #Specification: ioctl / UMSDOS_READDIR_DOS * One entry is read from the DOS directory at the current * file position. The entry is put as is in the dos_dirent * field of struct umsdos_ioctl. * * Return > 0 if success. */ struct UMSDOS_DIR_ONCE bufk; bufk.count = 0; bufk.ent = &idata->dos_dirent; fat_readdir (filp, &bufk, umsdos_ioctl_fill); ret = bufk.count == 1 ? 1 : 0; goto out; } if (cmd == UMSDOS_READDIR_EMD) { /* #Specification: ioctl / UMSDOS_READDIR_EMD * One entry is read from the EMD at the current * file position. The entry is put as is in the umsdos_dirent * field of struct umsdos_ioctl. The corresponding mangled * DOS entry name is put in the dos_dirent field. * * All entries are read including hidden links. Blank * entries are skipped. * * Return > 0 if success. */ struct dentry *demd; /* The absence of the EMD is simply seen as an EOF */ demd = umsdos_get_emd_dentry(dentry); ret = PTR_ERR(demd); if (IS_ERR(demd)) goto out; ret = 0; if (!demd->d_inode) goto read_dput; fill_new_filp(&new_filp, demd); new_filp.f_pos = filp->f_pos; while (new_filp.f_pos < demd->d_inode->i_size) { off_t f_pos = new_filp.f_pos; struct umsdos_dirent entry; struct umsdos_info info; ret = umsdos_emd_dir_readentry (&new_filp, &entry); if (ret) break; if (entry.name_len <= 0) continue; umsdos_parse (entry.name, entry.name_len, &info); info.f_pos = f_pos; umsdos_manglename (&info); ret = -EFAULT; if (copy_to_user (&idata->umsdos_dirent, &entry, sizeof (entry))) break; if (copy_to_user (&idata->dos_dirent.d_name, info.fake.fname, info.fake.len + 1)) break; ret = entry.name_len; break; } /* update the original f_pos */ filp->f_pos = new_filp.f_pos; read_dput: d_drop(demd); dput(demd); goto out; } if (cmd == UMSDOS_INIT_EMD) { /* #Specification: ioctl / UMSDOS_INIT_EMD * The UMSDOS_INIT_EMD command makes sure the EMD * exists for a directory. If it does not, it is * created. Also, it makes sure the directory function * table (struct inode_operations) is set to the UMSDOS * semantic. This mean that umssync may be applied to * an "opened" msdos directory, and it will change behavior * on the fly. * * Return 0 if success. */ extern struct inode_operations umsdos_rdir_inode_operations; ret = umsdos_make_emd(dentry); Printk(("UMSDOS_ioctl_dir: INIT_EMD %s/%s, ret=%d\n", dentry->d_parent->d_name.name, dentry->d_name.name, ret)); dir->i_op = (ret == 0) ? &umsdos_dir_inode_operations : &umsdos_rdir_inode_operations; goto out; } ret = -EFAULT; if (copy_from_user (&data, idata, sizeof (data))) goto out; if (cmd == UMSDOS_CREAT_EMD) { /* #Specification: ioctl / UMSDOS_CREAT_EMD * The umsdos_dirent field of the struct umsdos_ioctl is used * as is to create a new entry in the EMD of the directory. * The DOS directory is not modified. * No validation is done (yet). * * Return 0 if success. */ struct umsdos_info info; /* This makes sure info.entry and info in general * is correctly initialised */ memcpy (&info.entry, &data.umsdos_dirent, sizeof (data.umsdos_dirent)); umsdos_parse (data.umsdos_dirent.name ,data.umsdos_dirent.name_len, &info); ret = umsdos_newentry (dentry, &info); goto out; } else if (cmd == UMSDOS_RENAME_DOS) { struct dentry *old_dentry, *new_dentry; /* FIXME */ /* #Specification: ioctl / UMSDOS_RENAME_DOS * A file or directory is renamed in a DOS directory * (not moved across directory). The source name * is in the dos_dirent.name field and the destination * is in umsdos_dirent.name field. * * This ioctl allows umssync to rename a mangled file * name before syncing it back in the EMD. */ old_dentry = umsdos_lookup_dentry (dentry, data.dos_dirent.d_name, data.dos_dirent.d_reclen ,1); ret = PTR_ERR(old_dentry); if (IS_ERR(old_dentry)) goto out; new_dentry = umsdos_lookup_dentry (dentry, data.umsdos_dirent.name, data.umsdos_dirent.name_len, 1); ret = PTR_ERR(new_dentry); if (!IS_ERR(new_dentry)) { printk("umsdos_ioctl: renaming %s/%s to %s/%s\n", old_dentry->d_parent->d_name.name, old_dentry->d_name.name, new_dentry->d_parent->d_name.name, new_dentry->d_name.name); ret = msdos_rename (dir, old_dentry, dir, new_dentry); dput(new_dentry); } dput(old_dentry); goto out; } else if (cmd == UMSDOS_UNLINK_EMD) { /* #Specification: ioctl / UMSDOS_UNLINK_EMD * The umsdos_dirent field of the struct umsdos_ioctl is used * as is to remove an entry from the EMD of the directory. * No validation is done (yet). The mode field is used * to validate S_ISDIR or S_ISREG. * * Return 0 if success. */ struct umsdos_info info; /* This makes sure info.entry and info in general * is correctly initialised */ memcpy (&info.entry, &data.umsdos_dirent, sizeof (data.umsdos_dirent)); umsdos_parse (data.umsdos_dirent.name, data.umsdos_dirent.name_len, &info); ret = umsdos_delentry (dentry, &info, S_ISDIR (data.umsdos_dirent.mode)); if (ret) { printk(KERN_WARNING "umsdos_ioctl: delentry %s/%s failed, ret=%d\n", dentry->d_name.name, info.entry.name, ret); } goto out; } else if (cmd == UMSDOS_UNLINK_DOS) { struct dentry *temp; /* #Specification: ioctl / UMSDOS_UNLINK_DOS * The dos_dirent field of the struct umsdos_ioctl is used to * execute a msdos_unlink operation. The d_name and d_reclen * fields are used. * * Return 0 if success. */ temp = umsdos_lookup_dentry(dentry, data.dos_dirent.d_name, data.dos_dirent.d_reclen, 1); ret = PTR_ERR(temp); if (IS_ERR(temp)) goto out; ret = -ENOENT; if (temp->d_inode) { ret = -EISDIR; if (!S_ISDIR(temp->d_inode->i_mode)) ret = msdos_unlink (dir, temp); } dput (temp); goto out; } else if (cmd == UMSDOS_RMDIR_DOS) { struct dentry *temp; /* #Specification: ioctl / UMSDOS_RMDIR_DOS * The dos_dirent field of the struct umsdos_ioctl is used to * execute a msdos_rmdir operation. The d_name and d_reclen * fields are used. * * Return 0 if success. */ temp = umsdos_lookup_dentry(dentry, data.dos_dirent.d_name, data.dos_dirent.d_reclen, 1); ret = PTR_ERR(temp); if (IS_ERR(temp)) goto out; ret = -ENOENT; if (temp->d_inode) { ret = -ENOTDIR; if (S_ISDIR(temp->d_inode->i_mode)) ret = msdos_rmdir (dir, temp); } dput (temp); goto out; } else if (cmd == UMSDOS_STAT_DOS) { /* #Specification: ioctl / UMSDOS_STAT_DOS * The dos_dirent field of the struct umsdos_ioctl is * used to execute a stat operation in the DOS directory. * The d_name and d_reclen fields are used. * * The following field of umsdos_ioctl.stat are filled. * * st_ino,st_mode,st_size,st_atime,st_mtime,st_ctime, * Return 0 if success. */ struct dentry *dret; struct inode *inode; dret = umsdos_lookup_dentry(dentry, data.dos_dirent.d_name, data.dos_dirent.d_reclen, 1); ret = PTR_ERR(dret); if (IS_ERR(dret)) goto out; ret = -ENOENT; inode = dret->d_inode; if (inode) { data.stat.st_ino = inode->i_ino; data.stat.st_mode = inode->i_mode; data.stat.st_size = inode->i_size; data.stat.st_atime = inode->i_atime; data.stat.st_ctime = inode->i_ctime; data.stat.st_mtime = inode->i_mtime; ret = -EFAULT; if (!copy_to_user (&idata->stat, &data.stat, sizeof (data.stat))) ret = 0; } dput(dret); goto out; } else if (cmd == UMSDOS_DOS_SETUP) { /* #Specification: ioctl / UMSDOS_DOS_SETUP * The UMSDOS_DOS_SETUP ioctl allow changing the * default permission of the MS-DOS filesystem driver * on the fly. The MS-DOS driver applies global permissions * to every file and directory. Normally these permissions * are controlled by a mount option. This is not * available for root partition, so a special utility * (umssetup) is provided to do this, normally in * /etc/rc.local. * * Be aware that this applies ONLY to MS-DOS directories * (those without EMD --linux-.---). Umsdos directory * have independent (standard) permission for each * and every file. * * The field umsdos_dirent provide the information needed. * umsdos_dirent.uid and gid sets the owner and group. * umsdos_dirent.mode set the permissions flags. */ dir->i_sb->u.msdos_sb.options.fs_uid = data.umsdos_dirent.uid; dir->i_sb->u.msdos_sb.options.fs_gid = data.umsdos_dirent.gid; dir->i_sb->u.msdos_sb.options.fs_umask = data.umsdos_dirent.mode; ret = 0; } out: Printk (("ioctl %d, returning %d\n", cmd, ret)); return ret; }
static int umsdos_find (struct dentry *parent, struct umsdos_info *info) { struct umsdos_dirent *entry = &info->entry; int recsize = info->recsize; struct dentry *demd; struct inode *emd_dir; int ret = -ENOENT; struct find_buffer buf; struct { off_t posok; /* Position available to store the entry */ int found; /* A valid empty position has been found. */ off_t one; /* One empty position -> maybe <- large enough */ int onesize; /* size of empty region starting at one */ } empty; Printk (("umsdos_find: locating %s in %s/%s\n", entry->name, parent->d_parent->d_name.name, parent->d_name.name)); /* * Lookup the EMD file in the parent directory. */ demd = umsdos_get_emd_dentry(parent); ret = PTR_ERR(demd); if (IS_ERR(demd)) goto out; /* make sure there's an EMD file ... */ ret = -ENOENT; emd_dir = demd->d_inode; if (!emd_dir) goto out_dput; Printk(("umsdos_find: found EMD file %s/%s, ino=%p\n", demd->d_parent->d_name.name, demd->d_name.name, emd_dir)); fill_new_filp (&buf.filp, demd); buf.pos = 0; buf.size = 0; empty.found = 0; empty.posok = emd_dir->i_size; empty.onesize = 0; while (1) { struct umsdos_dirent *rentry = (struct umsdos_dirent *) (buf.buffer + buf.pos); int file_pos = buf.filp.f_pos - buf.size + buf.pos; if (buf.pos == buf.size) { ret = umsdos_fillbuf (&buf); if (ret < 0) { /* Not found, so note where it can be added */ info->f_pos = empty.posok; break; } } else if (rentry->name_len == 0) { /* We are looking for an empty section at least */ /* as large as recsize. */ if (entry->name_len == 0) { info->f_pos = file_pos; ret = 0; break; } else if (!empty.found) { if (empty.onesize == 0) { /* This is the first empty record of a section. */ empty.one = file_pos; } /* grow the empty section */ empty.onesize += UMSDOS_REC_SIZE; if (empty.onesize == recsize) { /* Here is a large enough section. */ empty.posok = empty.one; empty.found = 1; } } buf.pos += UMSDOS_REC_SIZE; } else { int entry_size = umsdos_evalrecsize (rentry->name_len); if (buf.pos + entry_size > buf.size) { ret = umsdos_fillbuf (&buf); if (ret < 0) { /* Not found, so note where it can be added */ info->f_pos = empty.posok; break; } } else { empty.onesize = 0; /* Reset the free slot search. */ if (entry->name_len == rentry->name_len && memcmp (entry->name, rentry->name, rentry->name_len) == 0) { info->f_pos = file_pos; *entry = *rentry; ret = 0; break; } else { buf.pos += entry_size; } } } } Printk(("umsdos_find: ready to mangle %s, len=%d, pos=%ld\n", entry->name, entry->name_len, (long)info->f_pos)); umsdos_manglename (info); out_dput: dput(demd); out: Printk (("umsdos_find: returning %d\n", ret)); return ret; }
/* * Write an entry in the EMD file. * Return 0 if OK, -EIO if some error. * * Note: the caller must hold a lock on the parent directory. */ static int umsdos_writeentry (struct dentry *parent, struct umsdos_info *info, int free_entry) { struct inode *dir = parent->d_inode; struct umsdos_dirent *entry = &info->entry; struct dentry *emd_dentry; int ret; struct umsdos_dirent entry0; struct file filp; emd_dentry = umsdos_get_emd_dentry(parent); ret = PTR_ERR(emd_dentry); if (IS_ERR(emd_dentry)) goto out; /* make sure there's an EMD file */ ret = -EIO; if (!emd_dentry->d_inode) { printk(KERN_WARNING "umsdos_writeentry: no EMD file in %s/%s\n", parent->d_parent->d_name.name, parent->d_name.name); goto out_dput; } if (free_entry) { /* #Specification: EMD file / empty entries * Unused entries in the EMD file are identified * by the name_len field equal to 0. However to * help future extension (or bug correction :-( ), * empty entries are filled with 0. */ memset (&entry0, 0, sizeof (entry0)); entry = &entry0; } else if (entry->name_len > 0) { memset (entry->name + entry->name_len, '\0', sizeof (entry->name) - entry->name_len); /* #Specification: EMD file / spare bytes * 10 bytes are unused in each record of the EMD. They * are set to 0 all the time, so it will be possible * to do new stuff and rely on the state of those * bytes in old EMD files. */ memset (entry->spare, 0, sizeof (entry->spare)); } fill_new_filp (&filp, emd_dentry); filp.f_pos = info->f_pos; filp.f_reada = 0; filp.f_flags = O_RDWR; /* write the entry and update the parent timestamps */ ret = umsdos_emd_dir_write (&filp, (char *) entry, info->recsize); if (!ret) { dir->i_ctime = dir->i_mtime = CURRENT_TIME; mark_inode_dirty(dir); } else printk ("UMSDOS: problem with EMD file: can't write\n"); out_dput: dput(emd_dentry); out: Printk (("umsdos_writeentry /mn/: returning %d...\n", ret)); return ret; }
static int umsdos_readdir_x (struct inode *dir, struct file *filp, void *dirbuf, struct umsdos_dirent *u_entry, filldir_t filldir) { struct dentry *demd; off_t start_fpos; int ret = 0; loff_t pos; umsdos_startlookup (dir); if (filp->f_pos == UMSDOS_SPECIAL_DIRFPOS && dir == pseudo_root) { /* * We don't need to simulate this pseudo directory * when umsdos_readdir_x is called for internal operation * of umsdos. This is why dirent_in_fs is tested */ /* #Specification: pseudo root / directory /DOS * When umsdos operates in pseudo root mode (C:\linux is the * linux root), it simulate a directory /DOS which points to * the real root of the file system. */ Printk ((KERN_WARNING "umsdos_readdir_x: pseudo_root thing UMSDOS_SPECIAL_DIRFPOS\n")); if (filldir (dirbuf, "DOS", 3, UMSDOS_SPECIAL_DIRFPOS, UMSDOS_ROOT_INO, DT_DIR) == 0) { filp->f_pos++; } goto out_end; } if (filp->f_pos < 2 || (dir->i_ino != UMSDOS_ROOT_INO && filp->f_pos == 32)) { int last_f_pos = filp->f_pos; struct UMSDOS_DIR_ONCE bufk; Printk (("umsdos_readdir_x: . or .. /mn/?\n")); bufk.dirbuf = dirbuf; bufk.filldir = filldir; bufk.count = 0; ret = fat_readdir (filp, &bufk, umsdos_dir_once); if (last_f_pos > 0 && filp->f_pos > last_f_pos) filp->f_pos = UMSDOS_SPECIAL_DIRFPOS; if (u_entry != NULL) u_entry->flags = 0; goto out_end; } Printk (("umsdos_readdir_x: normal file /mn/?\n")); /* get the EMD dentry */ demd = umsdos_get_emd_dentry(filp->f_dentry); ret = PTR_ERR(demd); if (IS_ERR(demd)) goto out_end; ret = -EIO; if (!demd->d_inode) { printk(KERN_WARNING "umsdos_readir_x: EMD file %s/%s not found\n", demd->d_parent->d_name.name, demd->d_name.name); goto out_dput; } pos = filp->f_pos; start_fpos = filp->f_pos; if (pos <= UMSDOS_SPECIAL_DIRFPOS + 1) pos = 0; ret = 0; while (pos < demd->d_inode->i_size) { off_t cur_f_pos = pos; struct dentry *dret; struct inode *inode; struct umsdos_dirent entry; struct umsdos_info info; ret = -EIO; if (umsdos_emd_dir_readentry (demd, &pos, &entry) != 0) break; if (entry.name_len == 0) continue; #ifdef UMSDOS_DEBUG_VERBOSE if (entry.flags & UMSDOS_HLINK) printk("umsdos_readdir_x: %s/%s is hardlink\n", filp->f_dentry->d_name.name, entry.name); #endif umsdos_parse (entry.name, entry.name_len, &info); info.f_pos = cur_f_pos; umsdos_manglename (&info); /* * Do a real lookup on the short name. */ dret = umsdos_covered(filp->f_dentry, info.fake.fname, info.fake.len); ret = PTR_ERR(dret); if (IS_ERR(dret)) break; /* * If the file wasn't found, remove it from the EMD. */ inode = dret->d_inode; if (!inode) goto remove_name; #ifdef UMSDOS_DEBUG_VERBOSE if (inode->u.umsdos_i.i_is_hlink) printk("umsdos_readdir_x: %s/%s already resolved, ino=%ld\n", dret->d_parent->d_name.name, dret->d_name.name, inode->i_ino); #endif Printk (("Found %s/%s, ino=%ld, flags=%x\n", dret->d_parent->d_name.name, info.fake.fname, dret->d_inode->i_ino, entry.flags)); /* check whether to resolve a hard-link */ if ((entry.flags & UMSDOS_HLINK) && !inode->u.umsdos_i.i_is_hlink) { dret = umsdos_solve_hlink (dret); ret = PTR_ERR(dret); if (IS_ERR(dret)) break; inode = dret->d_inode; if (!inode) { printk("umsdos_readdir_x: %s/%s negative after link\n", dret->d_parent->d_name.name, dret->d_name.name); goto clean_up; } } /* #Specification: pseudo root / reading real root * The pseudo root (/linux) is logically * erased from the real root. This means that * ls /DOS, won't show "linux". This avoids * infinite recursion (/DOS/linux/DOS/linux/...) while * walking the file system. */ if (inode != pseudo_root && !(entry.flags & UMSDOS_HIDDEN)) { if (filldir (dirbuf, entry.name, entry.name_len, cur_f_pos, inode->i_ino, DT_UNKNOWN) < 0) { pos = cur_f_pos; } Printk(("umsdos_readdir_x: got %s/%s, ino=%ld\n", dret->d_parent->d_name.name, dret->d_name.name, inode->i_ino)); if (u_entry != NULL) *u_entry = entry; dput(dret); ret = 0; break; } clean_up: dput(dret); continue; remove_name: /* #Specification: umsdos / readdir / not in MSDOS * During a readdir operation, if the file is not * in the MS-DOS directory any more, the entry is * removed from the EMD file silently. */ #ifdef UMSDOS_PARANOIA printk("umsdos_readdir_x: %s/%s out of sync, erasing\n", filp->f_dentry->d_name.name, info.entry.name); #endif ret = umsdos_delentry(filp->f_dentry, &info, S_ISDIR(info.entry.mode)); if (ret) printk(KERN_WARNING "umsdos_readdir_x: delentry %s, err=%d\n", info.entry.name, ret); goto clean_up; } /* * If the fillbuf has failed, f_pos is back to 0. * To avoid getting back into the . and .. state * (see comments at the beginning), we put back * the special offset. */ filp->f_pos = pos; if (filp->f_pos == 0) filp->f_pos = start_fpos; out_dput: dput(demd); out_end: umsdos_endlookup (dir); Printk ((KERN_DEBUG "read dir %p pos %Ld ret %d\n", dir, filp->f_pos, ret)); return ret; }
struct dentry *umsdos_solve_hlink (struct dentry *hlink) { /* root is our root for resolving pseudo-hardlink */ struct dentry *base = hlink->d_sb->s_root; struct dentry *dentry_dst; char *path, *pt; int len; struct address_space *mapping = hlink->d_inode->i_mapping; struct page *page; page=read_cache_page(mapping,0,(filler_t *)mapping->a_ops->readpage,NULL); dentry_dst=(struct dentry *)page; if (IS_ERR(page)) goto out; wait_on_page(page); if (!Page_Uptodate(page)) goto async_fail; dentry_dst = ERR_PTR(-ENOMEM); path = (char *) kmalloc (PATH_MAX, GFP_KERNEL); if (path == NULL) goto out_release; memcpy(path, kmap(page), hlink->d_inode->i_size); kunmap(page); page_cache_release(page); len = hlink->d_inode->i_size; /* start at root dentry */ dentry_dst = dget(base); path[len] = '\0'; pt = path; if (*path == '/') pt++; /* skip leading '/' */ if (base->d_inode == pseudo_root) pt += (UMSDOS_PSDROOT_LEN + 1); while (1) { struct dentry *dir = dentry_dst, *demd; char *start = pt; int real; while (*pt != '\0' && *pt != '/') pt++; len = (int) (pt - start); if (*pt == '/') *pt++ = '\0'; real = 1; demd = umsdos_get_emd_dentry(dir); if (!IS_ERR(demd)) { if (demd->d_inode) real = 0; dput(demd); } #ifdef UMSDOS_DEBUG_VERBOSE printk ("umsdos_solve_hlink: dir %s/%s, name=%s, real=%d\n", dir->d_parent->d_name.name, dir->d_name.name, start, real); #endif dentry_dst = umsdos_lookup_dentry(dir, start, len, real); /* XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX */ if (real) d_drop(dir); dput (dir); if (IS_ERR(dentry_dst)) break; /* not found? stop search ... */ if (!dentry_dst->d_inode) { break; } if (*pt == '\0') /* we're finished! */ break; } /* end while */ if (!IS_ERR(dentry_dst)) { struct inode *inode = dentry_dst->d_inode; if (inode) { inode->u.umsdos_i.i_is_hlink = 1; #ifdef UMSDOS_DEBUG_VERBOSE printk ("umsdos_solve_hlink: resolved link %s/%s, ino=%ld\n", dentry_dst->d_parent->d_name.name, dentry_dst->d_name.name, inode->i_ino); #endif } else { #ifdef UMSDOS_DEBUG_VERBOSE printk ("umsdos_solve_hlink: resolved link %s/%s negative!\n", dentry_dst->d_parent->d_name.name, dentry_dst->d_name.name); #endif } } else printk(KERN_WARNING "umsdos_solve_hlink: err=%ld\n", PTR_ERR(dentry_dst)); kfree (path); out: dput(hlink); /* original hlink no longer needed */ return dentry_dst; async_fail: dentry_dst = ERR_PTR(-EIO); out_release: page_cache_release(page); goto out; }