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Diffstat (limited to 'fs/namei.c')
-rw-r--r--fs/namei.c117
1 files changed, 85 insertions, 32 deletions
diff --git a/fs/namei.c b/fs/namei.c
index 85e40d1c0a8f..8b61d103a8a7 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -1352,7 +1352,7 @@ static int lookup_fast(struct nameidata *nd,
*/
if (nd->flags & LOOKUP_RCU) {
unsigned seq;
- dentry = __d_lookup_rcu(parent, &nd->last, &seq, nd->inode);
+ dentry = __d_lookup_rcu(parent, &nd->last, &seq);
if (!dentry)
goto unlazy;
@@ -1787,8 +1787,7 @@ static int link_path_walk(const char *name, struct nameidata *nd)
struct dentry *parent = nd->path.dentry;
nd->flags &= ~LOOKUP_JUMPED;
if (unlikely(parent->d_flags & DCACHE_OP_HASH)) {
- err = parent->d_op->d_hash(parent, nd->inode,
- &this);
+ err = parent->d_op->d_hash(parent, &this);
if (err < 0)
break;
}
@@ -1976,7 +1975,7 @@ static int path_lookupat(int dfd, const char *name,
err = complete_walk(nd);
if (!err && nd->flags & LOOKUP_DIRECTORY) {
- if (!nd->inode->i_op->lookup) {
+ if (!can_lookup(nd->inode)) {
path_put(&nd->path);
err = -ENOTDIR;
}
@@ -2121,7 +2120,7 @@ struct dentry *lookup_one_len(const char *name, struct dentry *base, int len)
* to use its own hash..
*/
if (base->d_flags & DCACHE_OP_HASH) {
- int err = base->d_op->d_hash(base, base->d_inode, &this);
+ int err = base->d_op->d_hash(base, &this);
if (err < 0)
return ERR_PTR(err);
}
@@ -2690,28 +2689,10 @@ static int do_last(struct nameidata *nd, struct path *path,
nd->flags &= ~LOOKUP_PARENT;
nd->flags |= op->intent;
- switch (nd->last_type) {
- case LAST_DOTDOT:
- case LAST_DOT:
+ if (nd->last_type != LAST_NORM) {
error = handle_dots(nd, nd->last_type);
if (error)
return error;
- /* fallthrough */
- case LAST_ROOT:
- error = complete_walk(nd);
- if (error)
- return error;
- audit_inode(name, nd->path.dentry, 0);
- if (open_flag & O_CREAT) {
- error = -EISDIR;
- goto out;
- }
- goto finish_open;
- case LAST_BIND:
- error = complete_walk(nd);
- if (error)
- return error;
- audit_inode(name, dir, 0);
goto finish_open;
}
@@ -2841,19 +2822,19 @@ finish_lookup:
}
nd->inode = inode;
/* Why this, you ask? _Now_ we might have grown LOOKUP_JUMPED... */
+finish_open:
error = complete_walk(nd);
if (error) {
path_put(&save_parent);
return error;
}
+ audit_inode(name, nd->path.dentry, 0);
error = -EISDIR;
if ((open_flag & O_CREAT) && S_ISDIR(nd->inode->i_mode))
goto out;
error = -ENOTDIR;
- if ((nd->flags & LOOKUP_DIRECTORY) && !nd->inode->i_op->lookup)
+ if ((nd->flags & LOOKUP_DIRECTORY) && !can_lookup(nd->inode))
goto out;
- audit_inode(name, nd->path.dentry, 0);
-finish_open:
if (!S_ISREG(nd->inode->i_mode))
will_truncate = false;
@@ -2920,6 +2901,67 @@ stale_open:
goto retry_lookup;
}
+static int do_tmpfile(int dfd, struct filename *pathname,
+ struct nameidata *nd, int flags,
+ const struct open_flags *op,
+ struct file *file, int *opened)
+{
+ static const struct qstr name = QSTR_INIT("/", 1);
+ struct dentry *dentry, *child;
+ struct inode *dir;
+ int error = path_lookupat(dfd, pathname->name,
+ flags | LOOKUP_DIRECTORY, nd);
+ if (unlikely(error))
+ return error;
+ error = mnt_want_write(nd->path.mnt);
+ if (unlikely(error))
+ goto out;
+ /* we want directory to be writable */
+ error = inode_permission(nd->inode, MAY_WRITE | MAY_EXEC);
+ if (error)
+ goto out2;
+ dentry = nd->path.dentry;
+ dir = dentry->d_inode;
+ if (!dir->i_op->tmpfile) {
+ error = -EOPNOTSUPP;
+ goto out2;
+ }
+ child = d_alloc(dentry, &name);
+ if (unlikely(!child)) {
+ error = -ENOMEM;
+ goto out2;
+ }
+ nd->flags &= ~LOOKUP_DIRECTORY;
+ nd->flags |= op->intent;
+ dput(nd->path.dentry);
+ nd->path.dentry = child;
+ error = dir->i_op->tmpfile(dir, nd->path.dentry, op->mode);
+ if (error)
+ goto out2;
+ audit_inode(pathname, nd->path.dentry, 0);
+ error = may_open(&nd->path, op->acc_mode, op->open_flag);
+ if (error)
+ goto out2;
+ file->f_path.mnt = nd->path.mnt;
+ error = finish_open(file, nd->path.dentry, NULL, opened);
+ if (error)
+ goto out2;
+ error = open_check_o_direct(file);
+ if (error) {
+ fput(file);
+ } else if (!(op->open_flag & O_EXCL)) {
+ struct inode *inode = file_inode(file);
+ spin_lock(&inode->i_lock);
+ inode->i_state |= I_LINKABLE;
+ spin_unlock(&inode->i_lock);
+ }
+out2:
+ mnt_drop_write(nd->path.mnt);
+out:
+ path_put(&nd->path);
+ return error;
+}
+
static struct file *path_openat(int dfd, struct filename *pathname,
struct nameidata *nd, const struct open_flags *op, int flags)
{
@@ -2935,6 +2977,11 @@ static struct file *path_openat(int dfd, struct filename *pathname,
file->f_flags = op->open_flag;
+ if (unlikely(file->f_flags & __O_TMPFILE)) {
+ error = do_tmpfile(dfd, pathname, nd, flags, op, file, &opened);
+ goto out;
+ }
+
error = path_init(dfd, pathname->name, flags | LOOKUP_PARENT, nd, &base);
if (unlikely(error))
goto out;
@@ -2987,9 +3034,10 @@ out:
}
struct file *do_filp_open(int dfd, struct filename *pathname,
- const struct open_flags *op, int flags)
+ const struct open_flags *op)
{
struct nameidata nd;
+ int flags = op->lookup_flags;
struct file *filp;
filp = path_openat(dfd, pathname, &nd, op, flags | LOOKUP_RCU);
@@ -3001,17 +3049,16 @@ struct file *do_filp_open(int dfd, struct filename *pathname,
}
struct file *do_file_open_root(struct dentry *dentry, struct vfsmount *mnt,
- const char *name, const struct open_flags *op, int flags)
+ const char *name, const struct open_flags *op)
{
struct nameidata nd;
struct file *file;
struct filename filename = { .name = name };
+ int flags = op->lookup_flags | LOOKUP_ROOT;
nd.root.mnt = mnt;
nd.root.dentry = dentry;
- flags |= LOOKUP_ROOT;
-
if (dentry->d_inode->i_op->follow_link && op->intent & LOOKUP_OPEN)
return ERR_PTR(-ELOOP);
@@ -3586,12 +3633,18 @@ int vfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *new_de
mutex_lock(&inode->i_mutex);
/* Make sure we don't allow creating hardlink to an unlinked file */
- if (inode->i_nlink == 0)
+ if (inode->i_nlink == 0 && !(inode->i_state & I_LINKABLE))
error = -ENOENT;
else if (max_links && inode->i_nlink >= max_links)
error = -EMLINK;
else
error = dir->i_op->link(old_dentry, dir, new_dentry);
+
+ if (!error && (inode->i_state & I_LINKABLE)) {
+ spin_lock(&inode->i_lock);
+ inode->i_state &= ~I_LINKABLE;
+ spin_unlock(&inode->i_lock);
+ }
mutex_unlock(&inode->i_mutex);
if (!error)
fsnotify_link(dir, inode, new_dentry);
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-20 13:50:39 +0000