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Subject[CFT][PATCH] (5/5) sane procfs/dcache interaction

diff -urN C8-file/fs/proc/base.c C8-procfs/fs/proc/base.c
--- C8-file/fs/proc/base.c Fri Apr 19 02:11:56 2002
+++ C8-procfs/fs/proc/base.c Fri Apr 19 01:20:20 2002
@@ -88,6 +88,11 @@
return PROC_I(inode)->task;
}

+static inline int proc_type(struct inode *inode)
+{
+ return PROC_I(inode)->type;
+}
+
ssize_t proc_pid_read_maps(struct task_struct*,struct file*,char*,size_t,loff_t*);
int proc_pid_stat(struct task_struct*,char*);
int proc_pid_status(struct task_struct*,char*);
@@ -99,7 +104,7 @@
struct task_struct *task = proc_task(inode);
struct files_struct *files;
struct file *file;
- int fd = (inode->i_ino & 0xffff) - PROC_PID_FD_DIR;
+ int fd = proc_type(inode) - PROC_PID_FD_DIR;

task_lock(task);
files = task->files;
@@ -735,6 +740,7 @@
*/
get_task_struct(task);
ei->task = task;
+ ei->type = ino;
inode->i_uid = 0;
inode->i_gid = 0;
if (ino == PROC_PID_INO || task_dumpable(task)) {
@@ -753,11 +759,6 @@

/* dentry stuff */

-static int pid_fd_revalidate(struct dentry * dentry, int flags)
-{
- return 0;
-}
-
/*
* Exceptional case: normally we are not allowed to unhash a busy
* directory. In this case, however, we can do it - no aliasing problems
@@ -771,6 +772,31 @@
return 0;
}

+static int pid_fd_revalidate(struct dentry * dentry, int flags)
+{
+ struct task_struct *task = proc_task(dentry->d_inode);
+ int fd = proc_type(dentry->d_inode) - PROC_PID_FD_DIR;
+ struct files_struct *files;
+
+ task_lock(task);
+ files = task->files;
+ if (files)
+ atomic_inc(&files->count);
+ task_unlock(task);
+ if (files) {
+ read_lock(&files->file_lock);
+ if (fcheck_files(files, fd)) {
+ read_unlock(&files->file_lock);
+ put_files_struct(files);
+ return 1;
+ }
+ read_unlock(&files->file_lock);
+ put_files_struct(files);
+ }
+ d_drop(dentry);
+ return 0;
+}
+
static void pid_base_iput(struct dentry *dentry, struct inode *inode)
{
struct task_struct *task = proc_task(inode);
@@ -781,11 +807,6 @@
iput(inode);
}

-static int pid_fd_delete_dentry(struct dentry * dentry)
-{
- return 1;
-}
-
static int pid_delete_dentry(struct dentry * dentry)
{
return proc_task(dentry->d_inode)->pid == 0;
@@ -794,7 +815,7 @@
static struct dentry_operations pid_fd_dentry_operations =
{
d_revalidate: pid_fd_revalidate,
- d_delete: pid_fd_delete_dentry,
+ d_delete: pid_delete_dentry,
};

static struct dentry_operations pid_dentry_operations =
@@ -879,8 +900,8 @@
return NULL;

out_unlock2:
- put_files_struct(files);
read_unlock(&files->file_lock);
+ put_files_struct(files);
out_unlock:
iput(inode);
out:

-
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