Merge git://git.kernel.org/pub/scm/linux/kernel/git/bunk/trivial

[pandora-kernel.git] / fs / pipe.c

diff --git a/fs/pipe.c b/fs/pipe.c
index b1626f2..f8b6bdc 100644 (file)
--- a/fs/pipe.c
+++ b/fs/pipe.c
@@ -222,7 +222,7 @@ pipe_read(struct kiocb *iocb, const struct iovec *_iov,
           unsigned long nr_segs, loff_t pos)
 {
        struct file *filp = iocb->ki_filp;
-       struct inode *inode = filp->f_dentry->d_inode;
+       struct inode *inode = filp->f_path.dentry->d_inode;
        struct pipe_inode_info *pipe;
        int do_wakeup;
        ssize_t ret;
@@ -335,7 +335,7 @@ pipe_write(struct kiocb *iocb, const struct iovec *_iov,
            unsigned long nr_segs, loff_t ppos)
 {
        struct file *filp = iocb->ki_filp;
-       struct inode *inode = filp->f_dentry->d_inode;
+       struct inode *inode = filp->f_path.dentry->d_inode;
        struct pipe_inode_info *pipe;
        ssize_t ret;
        int do_wakeup;
@@ -520,7 +520,7 @@ static int
 pipe_ioctl(struct inode *pino, struct file *filp,
           unsigned int cmd, unsigned long arg)
 {
-       struct inode *inode = filp->f_dentry->d_inode;
+       struct inode *inode = filp->f_path.dentry->d_inode;
        struct pipe_inode_info *pipe;
        int count, buf, nrbufs;
 
@@ -548,7 +548,7 @@ static unsigned int
 pipe_poll(struct file *filp, poll_table *wait)
 {
        unsigned int mask;
-       struct inode *inode = filp->f_dentry->d_inode;
+       struct inode *inode = filp->f_path.dentry->d_inode;
        struct pipe_inode_info *pipe = inode->i_pipe;
        int nrbufs;
 
@@ -601,7 +601,7 @@ pipe_release(struct inode *inode, int decr, int decw)
 static int
 pipe_read_fasync(int fd, struct file *filp, int on)
 {
-       struct inode *inode = filp->f_dentry->d_inode;
+       struct inode *inode = filp->f_path.dentry->d_inode;
        int retval;
 
        mutex_lock(&inode->i_mutex);
@@ -618,7 +618,7 @@ pipe_read_fasync(int fd, struct file *filp, int on)
 static int
 pipe_write_fasync(int fd, struct file *filp, int on)
 {
-       struct inode *inode = filp->f_dentry->d_inode;
+       struct inode *inode = filp->f_path.dentry->d_inode;
        int retval;
 
        mutex_lock(&inode->i_mutex);
@@ -635,7 +635,7 @@ pipe_write_fasync(int fd, struct file *filp, int on)
 static int
 pipe_rdwr_fasync(int fd, struct file *filp, int on)
 {
-       struct inode *inode = filp->f_dentry->d_inode;
+       struct inode *inode = filp->f_path.dentry->d_inode;
        struct pipe_inode_info *pipe = inode->i_pipe;
        int retval;
 
@@ -830,7 +830,14 @@ void free_pipe_info(struct inode *inode)
 static struct vfsmount *pipe_mnt __read_mostly;
 static int pipefs_delete_dentry(struct dentry *dentry)
 {
-       return 1;
+       /*
+        * At creation time, we pretended this dentry was hashed
+        * (by clearing DCACHE_UNHASHED bit in d_flags)
+        * At delete time, we restore the truth : not hashed.
+        * (so that dput() can proceed correctly)
+        */
+       dentry->d_flags |= DCACHE_UNHASHED;
+       return 0;
 }
 
 static struct dentry_operations pipefs_dentry_operations = {
@@ -891,19 +898,24 @@ struct file *create_write_pipe(void)
        if (!inode)
                goto err_file;
 
-       sprintf(name, "[%lu]", inode->i_ino);
+       this.len = sprintf(name, "[%lu]", inode->i_ino);
        this.name = name;
-       this.len = strlen(name);
-       this.hash = inode->i_ino; /* will go */
+       this.hash = 0;
        err = -ENOMEM;
        dentry = d_alloc(pipe_mnt->mnt_sb->s_root, &this);
        if (!dentry)
                goto err_inode;
 
        dentry->d_op = &pipefs_dentry_operations;
-       d_add(dentry, inode);
-       f->f_vfsmnt = mntget(pipe_mnt);
-       f->f_dentry = dentry;
+       /*
+        * We dont want to publish this dentry into global dentry hash table.
+        * We pretend dentry is already hashed, by unsetting DCACHE_UNHASHED
+        * This permits a working /proc/$pid/fd/XXX on pipes
+        */
+       dentry->d_flags &= ~DCACHE_UNHASHED;
+       d_instantiate(dentry, inode);
+       f->f_path.mnt = mntget(pipe_mnt);
+       f->f_path.dentry = dentry;
        f->f_mapping = inode->i_mapping;
 
        f->f_flags = O_WRONLY;
@@ -923,8 +935,8 @@ struct file *create_write_pipe(void)
 
 void free_write_pipe(struct file *f)
 {
-       mntput(f->f_vfsmnt);
-       dput(f->f_dentry);
+       mntput(f->f_path.mnt);
+       dput(f->f_path.dentry);
        put_filp(f);
 }
 
@@ -935,9 +947,9 @@ struct file *create_read_pipe(struct file *wrf)
                return ERR_PTR(-ENFILE);
 
        /* Grab pipe from the writer */
-       f->f_vfsmnt = mntget(wrf->f_vfsmnt);
-       f->f_dentry = dget(wrf->f_dentry);
-       f->f_mapping = wrf->f_dentry->d_inode->i_mapping;
+       f->f_path.mnt = mntget(wrf->f_path.mnt);
+       f->f_path.dentry = dget(wrf->f_path.dentry);
+       f->f_mapping = wrf->f_path.dentry->d_inode->i_mapping;
 
        f->f_pos = 0;
        f->f_flags = O_RDONLY;