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-rw-r--r--fs/smbfs/dir.c693
1 files changed, 693 insertions, 0 deletions
diff --git a/fs/smbfs/dir.c b/fs/smbfs/dir.c
new file mode 100644
index 000000000000..c6c33e15143a
--- /dev/null
+++ b/fs/smbfs/dir.c
@@ -0,0 +1,693 @@
+/*
+ * dir.c
+ *
+ * Copyright (C) 1995, 1996 by Paal-Kr. Engstad and Volker Lendecke
+ * Copyright (C) 1997 by Volker Lendecke
+ *
+ * Please add a note about your changes to smbfs in the ChangeLog file.
+ */
+
+#include <linux/time.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/smp_lock.h>
+#include <linux/ctype.h>
+#include <linux/net.h>
+
+#include <linux/smb_fs.h>
+#include <linux/smb_mount.h>
+#include <linux/smbno.h>
+
+#include "smb_debug.h"
+#include "proto.h"
+
+static int smb_readdir(struct file *, void *, filldir_t);
+static int smb_dir_open(struct inode *, struct file *);
+
+static struct dentry *smb_lookup(struct inode *, struct dentry *, struct nameidata *);
+static int smb_create(struct inode *, struct dentry *, int, struct nameidata *);
+static int smb_mkdir(struct inode *, struct dentry *, int);
+static int smb_rmdir(struct inode *, struct dentry *);
+static int smb_unlink(struct inode *, struct dentry *);
+static int smb_rename(struct inode *, struct dentry *,
+ struct inode *, struct dentry *);
+static int smb_make_node(struct inode *,struct dentry *,int,dev_t);
+static int smb_link(struct dentry *, struct inode *, struct dentry *);
+
+struct file_operations smb_dir_operations =
+{
+ .read = generic_read_dir,
+ .readdir = smb_readdir,
+ .ioctl = smb_ioctl,
+ .open = smb_dir_open,
+};
+
+struct inode_operations smb_dir_inode_operations =
+{
+ .create = smb_create,
+ .lookup = smb_lookup,
+ .unlink = smb_unlink,
+ .mkdir = smb_mkdir,
+ .rmdir = smb_rmdir,
+ .rename = smb_rename,
+ .getattr = smb_getattr,
+ .setattr = smb_notify_change,
+};
+
+struct inode_operations smb_dir_inode_operations_unix =
+{
+ .create = smb_create,
+ .lookup = smb_lookup,
+ .unlink = smb_unlink,
+ .mkdir = smb_mkdir,
+ .rmdir = smb_rmdir,
+ .rename = smb_rename,
+ .getattr = smb_getattr,
+ .setattr = smb_notify_change,
+ .symlink = smb_symlink,
+ .mknod = smb_make_node,
+ .link = smb_link,
+};
+
+/*
+ * Read a directory, using filldir to fill the dirent memory.
+ * smb_proc_readdir does the actual reading from the smb server.
+ *
+ * The cache code is almost directly taken from ncpfs
+ */
+static int
+smb_readdir(struct file *filp, void *dirent, filldir_t filldir)
+{
+ struct dentry *dentry = filp->f_dentry;
+ struct inode *dir = dentry->d_inode;
+ struct smb_sb_info *server = server_from_dentry(dentry);
+ union smb_dir_cache *cache = NULL;
+ struct smb_cache_control ctl;
+ struct page *page = NULL;
+ int result;
+
+ ctl.page = NULL;
+ ctl.cache = NULL;
+
+ VERBOSE("reading %s/%s, f_pos=%d\n",
+ DENTRY_PATH(dentry), (int) filp->f_pos);
+
+ result = 0;
+
+ lock_kernel();
+
+ switch ((unsigned int) filp->f_pos) {
+ case 0:
+ if (filldir(dirent, ".", 1, 0, dir->i_ino, DT_DIR) < 0)
+ goto out;
+ filp->f_pos = 1;
+ /* fallthrough */
+ case 1:
+ if (filldir(dirent, "..", 2, 1, parent_ino(dentry), DT_DIR) < 0)
+ goto out;
+ filp->f_pos = 2;
+ }
+
+ /*
+ * Make sure our inode is up-to-date.
+ */
+ result = smb_revalidate_inode(dentry);
+ if (result)
+ goto out;
+
+
+ page = grab_cache_page(&dir->i_data, 0);
+ if (!page)
+ goto read_really;
+
+ ctl.cache = cache = kmap(page);
+ ctl.head = cache->head;
+
+ if (!PageUptodate(page) || !ctl.head.eof) {
+ VERBOSE("%s/%s, page uptodate=%d, eof=%d\n",
+ DENTRY_PATH(dentry), PageUptodate(page),ctl.head.eof);
+ goto init_cache;
+ }
+
+ if (filp->f_pos == 2) {
+ if (jiffies - ctl.head.time >= SMB_MAX_AGE(server))
+ goto init_cache;
+
+ /*
+ * N.B. ncpfs checks mtime of dentry too here, we don't.
+ * 1. common smb servers do not update mtime on dir changes
+ * 2. it requires an extra smb request
+ * (revalidate has the same timeout as ctl.head.time)
+ *
+ * Instead smbfs invalidates its own cache on local changes
+ * and remote changes are not seen until timeout.
+ */
+ }
+
+ if (filp->f_pos > ctl.head.end)
+ goto finished;
+
+ ctl.fpos = filp->f_pos + (SMB_DIRCACHE_START - 2);
+ ctl.ofs = ctl.fpos / SMB_DIRCACHE_SIZE;
+ ctl.idx = ctl.fpos % SMB_DIRCACHE_SIZE;
+
+ for (;;) {
+ if (ctl.ofs != 0) {
+ ctl.page = find_lock_page(&dir->i_data, ctl.ofs);
+ if (!ctl.page)
+ goto invalid_cache;
+ ctl.cache = kmap(ctl.page);
+ if (!PageUptodate(ctl.page))
+ goto invalid_cache;
+ }
+ while (ctl.idx < SMB_DIRCACHE_SIZE) {
+ struct dentry *dent;
+ int res;
+
+ dent = smb_dget_fpos(ctl.cache->dentry[ctl.idx],
+ dentry, filp->f_pos);
+ if (!dent)
+ goto invalid_cache;
+
+ res = filldir(dirent, dent->d_name.name,
+ dent->d_name.len, filp->f_pos,
+ dent->d_inode->i_ino, DT_UNKNOWN);
+ dput(dent);
+ if (res)
+ goto finished;
+ filp->f_pos += 1;
+ ctl.idx += 1;
+ if (filp->f_pos > ctl.head.end)
+ goto finished;
+ }
+ if (ctl.page) {
+ kunmap(ctl.page);
+ SetPageUptodate(ctl.page);
+ unlock_page(ctl.page);
+ page_cache_release(ctl.page);
+ ctl.page = NULL;
+ }
+ ctl.idx = 0;
+ ctl.ofs += 1;
+ }
+invalid_cache:
+ if (ctl.page) {
+ kunmap(ctl.page);
+ unlock_page(ctl.page);
+ page_cache_release(ctl.page);
+ ctl.page = NULL;
+ }
+ ctl.cache = cache;
+init_cache:
+ smb_invalidate_dircache_entries(dentry);
+ ctl.head.time = jiffies;
+ ctl.head.eof = 0;
+ ctl.fpos = 2;
+ ctl.ofs = 0;
+ ctl.idx = SMB_DIRCACHE_START;
+ ctl.filled = 0;
+ ctl.valid = 1;
+read_really:
+ result = server->ops->readdir(filp, dirent, filldir, &ctl);
+ if (ctl.idx == -1)
+ goto invalid_cache; /* retry */
+ ctl.head.end = ctl.fpos - 1;
+ ctl.head.eof = ctl.valid;
+finished:
+ if (page) {
+ cache->head = ctl.head;
+ kunmap(page);
+ SetPageUptodate(page);
+ unlock_page(page);
+ page_cache_release(page);
+ }
+ if (ctl.page) {
+ kunmap(ctl.page);
+ SetPageUptodate(ctl.page);
+ unlock_page(ctl.page);
+ page_cache_release(ctl.page);
+ }
+out:
+ unlock_kernel();
+ return result;
+}
+
+static int
+smb_dir_open(struct inode *dir, struct file *file)
+{
+ struct dentry *dentry = file->f_dentry;
+ struct smb_sb_info *server;
+ int error = 0;
+
+ VERBOSE("(%s/%s)\n", dentry->d_parent->d_name.name,
+ file->f_dentry->d_name.name);
+
+ /*
+ * Directory timestamps in the core protocol aren't updated
+ * when a file is added, so we give them a very short TTL.
+ */
+ lock_kernel();
+ server = server_from_dentry(dentry);
+ if (server->opt.protocol < SMB_PROTOCOL_LANMAN2) {
+ unsigned long age = jiffies - SMB_I(dir)->oldmtime;
+ if (age > 2*HZ)
+ smb_invalid_dir_cache(dir);
+ }
+
+ /*
+ * Note: in order to allow the smbmount process to open the
+ * mount point, we only revalidate if the connection is valid or
+ * if the process is trying to access something other than the root.
+ */
+ if (server->state == CONN_VALID || !IS_ROOT(dentry))
+ error = smb_revalidate_inode(dentry);
+ unlock_kernel();
+ return error;
+}
+
+/*
+ * Dentry operations routines
+ */
+static int smb_lookup_validate(struct dentry *, struct nameidata *);
+static int smb_hash_dentry(struct dentry *, struct qstr *);
+static int smb_compare_dentry(struct dentry *, struct qstr *, struct qstr *);
+static int smb_delete_dentry(struct dentry *);
+
+static struct dentry_operations smbfs_dentry_operations =
+{
+ .d_revalidate = smb_lookup_validate,
+ .d_hash = smb_hash_dentry,
+ .d_compare = smb_compare_dentry,
+ .d_delete = smb_delete_dentry,
+};
+
+static struct dentry_operations smbfs_dentry_operations_case =
+{
+ .d_revalidate = smb_lookup_validate,
+ .d_delete = smb_delete_dentry,
+};
+
+
+/*
+ * This is the callback when the dcache has a lookup hit.
+ */
+static int
+smb_lookup_validate(struct dentry * dentry, struct nameidata *nd)
+{
+ struct smb_sb_info *server = server_from_dentry(dentry);
+ struct inode * inode = dentry->d_inode;
+ unsigned long age = jiffies - dentry->d_time;
+ int valid;
+
+ /*
+ * The default validation is based on dentry age:
+ * we believe in dentries for a few seconds. (But each
+ * successful server lookup renews the timestamp.)
+ */
+ valid = (age <= SMB_MAX_AGE(server));
+#ifdef SMBFS_DEBUG_VERBOSE
+ if (!valid)
+ VERBOSE("%s/%s not valid, age=%lu\n",
+ DENTRY_PATH(dentry), age);
+#endif
+
+ if (inode) {
+ lock_kernel();
+ if (is_bad_inode(inode)) {
+ PARANOIA("%s/%s has dud inode\n", DENTRY_PATH(dentry));
+ valid = 0;
+ } else if (!valid)
+ valid = (smb_revalidate_inode(dentry) == 0);
+ unlock_kernel();
+ } else {
+ /*
+ * What should we do for negative dentries?
+ */
+ }
+ return valid;
+}
+
+static int
+smb_hash_dentry(struct dentry *dir, struct qstr *this)
+{
+ unsigned long hash;
+ int i;
+
+ hash = init_name_hash();
+ for (i=0; i < this->len ; i++)
+ hash = partial_name_hash(tolower(this->name[i]), hash);
+ this->hash = end_name_hash(hash);
+
+ return 0;
+}
+
+static int
+smb_compare_dentry(struct dentry *dir, struct qstr *a, struct qstr *b)
+{
+ int i, result = 1;
+
+ if (a->len != b->len)
+ goto out;
+ for (i=0; i < a->len; i++) {
+ if (tolower(a->name[i]) != tolower(b->name[i]))
+ goto out;
+ }
+ result = 0;
+out:
+ return result;
+}
+
+/*
+ * This is the callback from dput() when d_count is going to 0.
+ * We use this to unhash dentries with bad inodes.
+ */
+static int
+smb_delete_dentry(struct dentry * dentry)
+{
+ if (dentry->d_inode) {
+ if (is_bad_inode(dentry->d_inode)) {
+ PARANOIA("bad inode, unhashing %s/%s\n",
+ DENTRY_PATH(dentry));
+ return 1;
+ }
+ } else {
+ /* N.B. Unhash negative dentries? */
+ }
+ return 0;
+}
+
+/*
+ * Initialize a new dentry
+ */
+void
+smb_new_dentry(struct dentry *dentry)
+{
+ struct smb_sb_info *server = server_from_dentry(dentry);
+
+ if (server->mnt->flags & SMB_MOUNT_CASE)
+ dentry->d_op = &smbfs_dentry_operations_case;
+ else
+ dentry->d_op = &smbfs_dentry_operations;
+ dentry->d_time = jiffies;
+}
+
+
+/*
+ * Whenever a lookup succeeds, we know the parent directories
+ * are all valid, so we want to update the dentry timestamps.
+ * N.B. Move this to dcache?
+ */
+void
+smb_renew_times(struct dentry * dentry)
+{
+ dget(dentry);
+ spin_lock(&dentry->d_lock);
+ for (;;) {
+ struct dentry *parent;
+
+ dentry->d_time = jiffies;
+ if (IS_ROOT(dentry))
+ break;
+ parent = dentry->d_parent;
+ dget(parent);
+ spin_unlock(&dentry->d_lock);
+ dput(dentry);
+ dentry = parent;
+ spin_lock(&dentry->d_lock);
+ }
+ spin_unlock(&dentry->d_lock);
+ dput(dentry);
+}
+
+static struct dentry *
+smb_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
+{
+ struct smb_fattr finfo;
+ struct inode *inode;
+ int error;
+ struct smb_sb_info *server;
+
+ error = -ENAMETOOLONG;
+ if (dentry->d_name.len > SMB_MAXNAMELEN)
+ goto out;
+
+ lock_kernel();
+ error = smb_proc_getattr(dentry, &finfo);
+#ifdef SMBFS_PARANOIA
+ if (error && error != -ENOENT)
+ PARANOIA("find %s/%s failed, error=%d\n",
+ DENTRY_PATH(dentry), error);
+#endif
+
+ inode = NULL;
+ if (error == -ENOENT)
+ goto add_entry;
+ if (!error) {
+ error = -EACCES;
+ finfo.f_ino = iunique(dentry->d_sb, 2);
+ inode = smb_iget(dir->i_sb, &finfo);
+ if (inode) {
+ add_entry:
+ server = server_from_dentry(dentry);
+ if (server->mnt->flags & SMB_MOUNT_CASE)
+ dentry->d_op = &smbfs_dentry_operations_case;
+ else
+ dentry->d_op = &smbfs_dentry_operations;
+
+ d_add(dentry, inode);
+ smb_renew_times(dentry);
+ error = 0;
+ }
+ }
+ unlock_kernel();
+out:
+ return ERR_PTR(error);
+}
+
+/*
+ * This code is common to all routines creating a new inode.
+ */
+static int
+smb_instantiate(struct dentry *dentry, __u16 fileid, int have_id)
+{
+ struct smb_sb_info *server = server_from_dentry(dentry);
+ struct inode *inode;
+ int error;
+ struct smb_fattr fattr;
+
+ VERBOSE("file %s/%s, fileid=%u\n", DENTRY_PATH(dentry), fileid);
+
+ error = smb_proc_getattr(dentry, &fattr);
+ if (error)
+ goto out_close;
+
+ smb_renew_times(dentry);
+ fattr.f_ino = iunique(dentry->d_sb, 2);
+ inode = smb_iget(dentry->d_sb, &fattr);
+ if (!inode)
+ goto out_no_inode;
+
+ if (have_id) {
+ struct smb_inode_info *ei = SMB_I(inode);
+ ei->fileid = fileid;
+ ei->access = SMB_O_RDWR;
+ ei->open = server->generation;
+ }
+ d_instantiate(dentry, inode);
+out:
+ return error;
+
+out_no_inode:
+ error = -EACCES;
+out_close:
+ if (have_id) {
+ PARANOIA("%s/%s failed, error=%d, closing %u\n",
+ DENTRY_PATH(dentry), error, fileid);
+ smb_close_fileid(dentry, fileid);
+ }
+ goto out;
+}
+
+/* N.B. How should the mode argument be used? */
+static int
+smb_create(struct inode *dir, struct dentry *dentry, int mode,
+ struct nameidata *nd)
+{
+ struct smb_sb_info *server = server_from_dentry(dentry);
+ __u16 fileid;
+ int error;
+ struct iattr attr;
+
+ VERBOSE("creating %s/%s, mode=%d\n", DENTRY_PATH(dentry), mode);
+
+ lock_kernel();
+ smb_invalid_dir_cache(dir);
+ error = smb_proc_create(dentry, 0, get_seconds(), &fileid);
+ if (!error) {
+ if (server->opt.capabilities & SMB_CAP_UNIX) {
+ /* Set attributes for new file */
+ attr.ia_valid = ATTR_MODE;
+ attr.ia_mode = mode;
+ error = smb_proc_setattr_unix(dentry, &attr, 0, 0);
+ }
+ error = smb_instantiate(dentry, fileid, 1);
+ } else {
+ PARANOIA("%s/%s failed, error=%d\n",
+ DENTRY_PATH(dentry), error);
+ }
+ unlock_kernel();
+ return error;
+}
+
+/* N.B. How should the mode argument be used? */
+static int
+smb_mkdir(struct inode *dir, struct dentry *dentry, int mode)
+{
+ struct smb_sb_info *server = server_from_dentry(dentry);
+ int error;
+ struct iattr attr;
+
+ lock_kernel();
+ smb_invalid_dir_cache(dir);
+ error = smb_proc_mkdir(dentry);
+ if (!error) {
+ if (server->opt.capabilities & SMB_CAP_UNIX) {
+ /* Set attributes for new directory */
+ attr.ia_valid = ATTR_MODE;
+ attr.ia_mode = mode;
+ error = smb_proc_setattr_unix(dentry, &attr, 0, 0);
+ }
+ error = smb_instantiate(dentry, 0, 0);
+ }
+ unlock_kernel();
+ return error;
+}
+
+static int
+smb_rmdir(struct inode *dir, struct dentry *dentry)
+{
+ struct inode *inode = dentry->d_inode;
+ int error;
+
+ /*
+ * Close the directory if it's open.
+ */
+ lock_kernel();
+ smb_close(inode);
+
+ /*
+ * Check that nobody else is using the directory..
+ */
+ error = -EBUSY;
+ if (!d_unhashed(dentry))
+ goto out;
+
+ smb_invalid_dir_cache(dir);
+ error = smb_proc_rmdir(dentry);
+
+out:
+ unlock_kernel();
+ return error;
+}
+
+static int
+smb_unlink(struct inode *dir, struct dentry *dentry)
+{
+ int error;
+
+ /*
+ * Close the file if it's open.
+ */
+ lock_kernel();
+ smb_close(dentry->d_inode);
+
+ smb_invalid_dir_cache(dir);
+ error = smb_proc_unlink(dentry);
+ if (!error)
+ smb_renew_times(dentry);
+ unlock_kernel();
+ return error;
+}
+
+static int
+smb_rename(struct inode *old_dir, struct dentry *old_dentry,
+ struct inode *new_dir, struct dentry *new_dentry)
+{
+ int error;
+
+ /*
+ * Close any open files, and check whether to delete the
+ * target before attempting the rename.
+ */
+ lock_kernel();
+ if (old_dentry->d_inode)
+ smb_close(old_dentry->d_inode);
+ if (new_dentry->d_inode) {
+ smb_close(new_dentry->d_inode);
+ error = smb_proc_unlink(new_dentry);
+ if (error) {
+ VERBOSE("unlink %s/%s, error=%d\n",
+ DENTRY_PATH(new_dentry), error);
+ goto out;
+ }
+ /* FIXME */
+ d_delete(new_dentry);
+ }
+
+ smb_invalid_dir_cache(old_dir);
+ smb_invalid_dir_cache(new_dir);
+ error = smb_proc_mv(old_dentry, new_dentry);
+ if (!error) {
+ smb_renew_times(old_dentry);
+ smb_renew_times(new_dentry);
+ }
+out:
+ unlock_kernel();
+ return error;
+}
+
+/*
+ * FIXME: samba servers won't let you create device nodes unless uid/gid
+ * matches the connection credentials (and we don't know which those are ...)
+ */
+static int
+smb_make_node(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
+{
+ int error;
+ struct iattr attr;
+
+ attr.ia_valid = ATTR_MODE | ATTR_UID | ATTR_GID;
+ attr.ia_mode = mode;
+ attr.ia_uid = current->euid;
+ attr.ia_gid = current->egid;
+
+ if (!new_valid_dev(dev))
+ return -EINVAL;
+
+ smb_invalid_dir_cache(dir);
+ error = smb_proc_setattr_unix(dentry, &attr, MAJOR(dev), MINOR(dev));
+ if (!error) {
+ error = smb_instantiate(dentry, 0, 0);
+ }
+ return error;
+}
+
+/*
+ * dentry = existing file
+ * new_dentry = new file
+ */
+static int
+smb_link(struct dentry *dentry, struct inode *dir, struct dentry *new_dentry)
+{
+ int error;
+
+ DEBUG1("smb_link old=%s/%s new=%s/%s\n",
+ DENTRY_PATH(dentry), DENTRY_PATH(new_dentry));
+ smb_invalid_dir_cache(dir);
+ error = smb_proc_link(server_from_dentry(dentry), dentry, new_dentry);
+ if (!error) {
+ smb_renew_times(dentry);
+ error = smb_instantiate(new_dentry, 0, 0);
+ }
+ return error;
+}
generated by cgit v1.2.3 (git 2.0.4) at 2024-11-08 05:48:14 +0000