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Revert "[PATCH] Fix d_path for lazy unmounts"
This reverts commit eb3dfb0cb1.
It causes some strange Gnome problem with dbus-daemon getting stuck, so
we'll revert it until that problem is understood.
Reported by both walt and Greg KH, who both independently git-bisected
the problem to this commit.
Andreas is looking at it.
Reported-by: walt <wa1ter@myrealbox.com>
Reported-by: Greg KH <greg@kroah.com>
Acked-by: Andreas Gruenbacher <agruen@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Linus Torvalds
parent
ec2f9d1331
commit
552ce544ed
1 changed files with 70 additions and 80 deletions
150
fs/dcache.c
150
fs/dcache.c
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@ -1739,41 +1739,45 @@ shouldnt_be_hashed:
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* @rootmnt: vfsmnt to which the root dentry belongs
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* @buffer: buffer to return value in
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* @buflen: buffer length
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* @fail_deleted: what to return for deleted files
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*
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* Convert a dentry into an ASCII path name. If the entry has been deleted,
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* then if @fail_deleted is true, ERR_PTR(-ENOENT) is returned. Otherwise,
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* the the string " (deleted)" is appended. Note that this is ambiguous.
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* Convert a dentry into an ASCII path name. If the entry has been deleted
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* the string " (deleted)" is appended. Note that this is ambiguous.
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*
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* Returns the buffer or an error code.
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* Returns the buffer or an error code if the path was too long.
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*
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* "buflen" should be positive. Caller holds the dcache_lock.
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*/
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static char *__d_path(struct dentry *dentry, struct vfsmount *vfsmnt,
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struct dentry *root, struct vfsmount *rootmnt,
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char *buffer, int buflen, int fail_deleted)
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static char * __d_path( struct dentry *dentry, struct vfsmount *vfsmnt,
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struct dentry *root, struct vfsmount *rootmnt,
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char *buffer, int buflen)
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{
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int namelen, is_slash;
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char * end = buffer+buflen;
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char * retval;
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int namelen;
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if (buflen < 2)
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return ERR_PTR(-ENAMETOOLONG);
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buffer += --buflen;
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*buffer = '\0';
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spin_lock(&dcache_lock);
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*--end = '\0';
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buflen--;
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if (!IS_ROOT(dentry) && d_unhashed(dentry)) {
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if (fail_deleted) {
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buffer = ERR_PTR(-ENOENT);
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goto out;
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}
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if (buflen < 10)
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goto Elong;
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buflen -= 10;
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buffer -= 10;
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memcpy(buffer, " (deleted)", 10);
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end -= 10;
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if (buflen < 0)
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goto Elong;
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memcpy(end, " (deleted)", 10);
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}
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while (dentry != root || vfsmnt != rootmnt) {
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if (buflen < 1)
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goto Elong;
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/* Get '/' right */
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retval = end-1;
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*retval = '/';
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for (;;) {
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struct dentry * parent;
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if (dentry == root && vfsmnt == rootmnt)
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break;
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if (dentry == vfsmnt->mnt_root || IS_ROOT(dentry)) {
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/* Global root? */
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spin_lock(&vfsmount_lock);
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if (vfsmnt->mnt_parent == vfsmnt) {
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spin_unlock(&vfsmount_lock);
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@ -1787,60 +1791,33 @@ static char *__d_path(struct dentry *dentry, struct vfsmount *vfsmnt,
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parent = dentry->d_parent;
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prefetch(parent);
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namelen = dentry->d_name.len;
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if (buflen <= namelen)
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goto Elong;
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buflen -= namelen + 1;
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buffer -= namelen;
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memcpy(buffer, dentry->d_name.name, namelen);
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*--buffer = '/';
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if (buflen < 0)
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goto Elong;
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end -= namelen;
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memcpy(end, dentry->d_name.name, namelen);
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*--end = '/';
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retval = end;
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dentry = parent;
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}
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/* Get '/' right */
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if (*buffer != '/')
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*--buffer = '/';
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out:
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spin_unlock(&dcache_lock);
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return buffer;
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return retval;
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global_root:
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/*
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* We went past the (vfsmount, dentry) we were looking for and have
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* either hit a root dentry, a lazily unmounted dentry, an
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* unconnected dentry, or the file is on a pseudo filesystem.
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*/
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namelen = dentry->d_name.len;
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is_slash = (namelen == 1 && *dentry->d_name.name == '/');
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if (is_slash || (dentry->d_sb->s_flags & MS_NOUSER)) {
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/*
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* Make sure we won't return a pathname starting with '/'.
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*
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* Historically, we also glue together the root dentry and
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* remaining name for pseudo filesystems like pipefs, which
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* have the MS_NOUSER flag set. This results in pathnames
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* like "pipe:[439336]".
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*/
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if (*buffer == '/') {
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buffer++;
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buflen++;
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}
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if (is_slash)
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goto out;
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}
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if (buflen < namelen)
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buflen -= namelen;
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if (buflen < 0)
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goto Elong;
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buffer -= namelen;
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memcpy(buffer, dentry->d_name.name, namelen);
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goto out;
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retval -= namelen-1; /* hit the slash */
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memcpy(retval, dentry->d_name.name, namelen);
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return retval;
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Elong:
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buffer = ERR_PTR(-ENAMETOOLONG);
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goto out;
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return ERR_PTR(-ENAMETOOLONG);
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}
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/* write full pathname into buffer and return start of pathname */
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char *d_path(struct dentry *dentry, struct vfsmount *vfsmnt, char *buf,
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int buflen)
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char * d_path(struct dentry *dentry, struct vfsmount *vfsmnt,
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char *buf, int buflen)
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{
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char *res;
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struct vfsmount *rootmnt;
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@ -1850,7 +1827,9 @@ char *d_path(struct dentry *dentry, struct vfsmount *vfsmnt, char *buf,
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rootmnt = mntget(current->fs->rootmnt);
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root = dget(current->fs->root);
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read_unlock(¤t->fs->lock);
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res = __d_path(dentry, vfsmnt, root, rootmnt, buf, buflen, 0);
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spin_lock(&dcache_lock);
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res = __d_path(dentry, vfsmnt, root, rootmnt, buf, buflen);
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spin_unlock(&dcache_lock);
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dput(root);
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mntput(rootmnt);
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return res;
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@ -1876,10 +1855,10 @@ char *d_path(struct dentry *dentry, struct vfsmount *vfsmnt, char *buf,
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*/
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asmlinkage long sys_getcwd(char __user *buf, unsigned long size)
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{
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int error, len;
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int error;
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struct vfsmount *pwdmnt, *rootmnt;
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struct dentry *pwd, *root;
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char *page = (char *) __get_free_page(GFP_USER), *cwd;
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char *page = (char *) __get_free_page(GFP_USER);
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if (!page)
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return -ENOMEM;
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@ -1891,18 +1870,29 @@ asmlinkage long sys_getcwd(char __user *buf, unsigned long size)
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root = dget(current->fs->root);
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read_unlock(¤t->fs->lock);
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cwd = __d_path(pwd, pwdmnt, root, rootmnt, page, PAGE_SIZE, 1);
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error = PTR_ERR(cwd);
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if (IS_ERR(cwd))
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goto out;
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error = -ENOENT;
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/* Has the current directory has been unlinked? */
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spin_lock(&dcache_lock);
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if (pwd->d_parent == pwd || !d_unhashed(pwd)) {
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unsigned long len;
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char * cwd;
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error = -ERANGE;
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len = PAGE_SIZE + page - cwd;
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if (len <= size) {
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error = len;
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if (copy_to_user(buf, cwd, len))
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error = -EFAULT;
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}
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cwd = __d_path(pwd, pwdmnt, root, rootmnt, page, PAGE_SIZE);
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spin_unlock(&dcache_lock);
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error = PTR_ERR(cwd);
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if (IS_ERR(cwd))
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goto out;
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error = -ERANGE;
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len = PAGE_SIZE + page - cwd;
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if (len <= size) {
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error = len;
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if (copy_to_user(buf, cwd, len))
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error = -EFAULT;
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}
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} else
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spin_unlock(&dcache_lock);
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out:
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dput(pwd);
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