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Message-Id: <200710181726.23976.jara@sin.cvut.cz>
Date: Thu, 18 Oct 2007 17:26:23 +0200
From: Jaroslav Sykora <jara@....cvut.cz>
To: linux-kernel@...r.kernel.org
Cc: linux-fsdevel@...r.kernel.org
Subject: [RFC PATCH 4/5] Shadow directories: procfs
Procfs interface: /proc/<pid>/status, /proc/<pid>/{root-shdw, cwd-shdw}.
Signed-off-by: Jaroslav Sykora <jaroslav.sykora@...il.com>
fs/proc/array.c | 23 +++++++++++++++++++
fs/proc/base.c | 53 ++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 76 insertions(+)
--- orig/fs/proc/base.c 2007-10-07 19:00:20.000000000 +0200
+++ new/fs/proc/base.c 2007-10-07 13:39:08.000000000 +0200
@@ -171,6 +171,32 @@ static int proc_cwd_link(struct inode *i
return result;
}
+static int proc_shdwcwd_link(struct inode *inode, struct dentry **dentry,
+ struct vfsmount **mnt)
+{
+ struct task_struct *task = get_proc_task(inode);
+ struct fs_struct *fs = NULL;
+ int result = -ENOENT;
+
+ if (task) {
+ fs = get_fs_struct(task);
+ put_task_struct(task);
+ }
+ if (fs) {
+ read_lock(&fs->lock);
+ *dentry = dget(fs->shdwpwd);
+ if (fs->shdwpwd)
+ *mnt = mntget(fs->shdwpwdmnt);
+ else
+ *mnt = NULL;
+ read_unlock(&fs->lock);
+ if (*dentry)
+ result = 0;
+ put_fs_struct(fs);
+ }
+ return result;
+}
+
static int proc_root_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt)
{
struct task_struct *task = get_proc_task(inode);
@@ -192,6 +218,29 @@ static int proc_root_link(struct inode *
return result;
}
+static int proc_shdwroot_link(struct inode *inode, struct dentry **dentry,
+ struct vfsmount **mnt)
+{
+ struct task_struct *task = get_proc_task(inode);
+ struct fs_struct *fs = NULL;
+ int result = -ENOENT;
+
+ if (task) {
+ fs = get_fs_struct(task);
+ put_task_struct(task);
+ }
+ if (fs) {
+ read_lock(&fs->lock);
+ *mnt = mntget(fs->shdwrootmnt);
+ *dentry = dget(fs->shdwroot);
+ read_unlock(&fs->lock);
+ if (*dentry)
+ result = 0;
+ put_fs_struct(fs);
+ }
+ return result;
+}
+
#define MAY_PTRACE(task) \
(task == current || \
(task->parent == current && \
@@ -2094,6 +2143,8 @@ static const struct pid_entry tgid_base_
#if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE)
REG("coredump_filter", S_IRUGO|S_IWUSR, coredump_filter),
#endif
+ LNK("root-shdw", shdwroot),
+ LNK("cwd-shdw", shdwcwd),
#ifdef CONFIG_TASK_IO_ACCOUNTING
INF("io", S_IRUGO, pid_io_accounting),
#endif
@@ -2377,6 +2428,8 @@ static const struct pid_entry tid_base_s
#ifdef CONFIG_FAULT_INJECTION
REG("make-it-fail", S_IRUGO|S_IWUSR, fault_inject),
#endif
+ LNK("root-shdw", shdwroot),
+ LNK("cwd-shdw", shdwcwd),
};
static int proc_tid_base_readdir(struct file * filp,
--- orig/fs/proc/array.c 2007-10-07 19:00:20.000000000 +0200
+++ new/fs/proc/array.c 2007-10-07 19:57:03.000000000 +0200
@@ -298,6 +298,28 @@ static inline char *task_context_switch_
p->nivcsw);
}
+static inline char *task_fsinfo(struct task_struct *p, char *buffer)
+{
+ int enabled = 0, use_esc = 0, esc_ch = 0;
+
+ rcu_read_lock();
+ task_lock(p);
+ if (p->fs) {
+ read_lock(&p->fs->lock);
+ enabled = (p->fs->flags & SHDW_ENABLED) ? 1 : 0;
+ use_esc = (p->fs->flags & SHDW_USE_ESC) ? 1 : 0;
+ esc_ch = p->fs->shdw_escch;
+ read_unlock(&p->fs->lock);
+ }
+ task_unlock(p);
+ rcu_read_unlock();
+
+ return buffer + sprintf(buffer, "Shdw_Enabled:\t%d\n"
+ "Shdw_UseEscChar: %d\n"
+ "Shdw_EscChar:\t%u\n",
+ enabled, use_esc, (unsigned int)esc_ch);
+}
+
int proc_pid_status(struct task_struct *task, char *buffer)
{
char *orig = buffer;
@@ -317,6 +339,7 @@ int proc_pid_status(struct task_struct *
buffer = task_show_regs(task, buffer);
#endif
buffer = task_context_switch_counts(task, buffer);
+ buffer = task_fsinfo(task, buffer);
return buffer - orig;
}
-
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