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dcache: extrace and use d_unlinked() 

d_unlinked() will be used in middle-term to ban checkpointing when opened
but unlinked file is detected, and in long term, to detect such situation
and special case on it.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Alexey Dobriyan 2009-05-04 03:32:03 +04:00 committed by Al Viro
parent 8c85e12512
commit f3da392e9f
3 changed files with 12 additions and 8 deletions
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7
fs/dcache.c
View File

@ -1910,7 +1910,7 @@ char *__d_path(const struct path *path, struct path *root,
spin_lock(&vfsmount_lock); spin_lock(&vfsmount_lock);
prepend(&end, &buflen, "\0", 1); prepend(&end, &buflen, "\0", 1);
if (!IS_ROOT(dentry) && d_unhashed(dentry) && if (d_unlinked(dentry) &&
(prepend(&end, &buflen, " (deleted)", 10) != 0)) (prepend(&end, &buflen, " (deleted)", 10) != 0))
goto Elong; goto Elong;
@ -2035,7 +2035,7 @@ char *dentry_path(struct dentry *dentry, char *buf, int buflen)
spin_lock(&dcache_lock); spin_lock(&dcache_lock);
prepend(&end, &buflen, "\0", 1); prepend(&end, &buflen, "\0", 1);
if (!IS_ROOT(dentry) && d_unhashed(dentry) && if (d_unlinked(dentry) &&
(prepend(&end, &buflen, "//deleted", 9) != 0)) (prepend(&end, &buflen, "//deleted", 9) != 0))
goto Elong; goto Elong;
if (buflen < 1) if (buflen < 1)
@ -2097,9 +2097,8 @@ SYSCALL_DEFINE2(getcwd, char __user *, buf, unsigned long, size)
read_unlock(&current->fs->lock); read_unlock(&current->fs->lock);
error = -ENOENT; error = -ENOENT;
/* Has the current directory has been unlinked? */
spin_lock(&dcache_lock); spin_lock(&dcache_lock);
if (IS_ROOT(pwd.dentry) || !d_unhashed(pwd.dentry)) { if (!d_unlinked(pwd.dentry)) {
unsigned long len; unsigned long len;
struct path tmp = root; struct path tmp = root;
char * cwd; char * cwd;

8
fs/namespace.c
View File

@ -1384,7 +1384,7 @@ static int graft_tree(struct vfsmount *mnt, struct path *path)
goto out_unlock; goto out_unlock;
err = -ENOENT; err = -ENOENT;
if (IS_ROOT(path->dentry) || !d_unhashed(path->dentry)) if (!d_unlinked(path->dentry))
err = attach_recursive_mnt(mnt, path, NULL); err = attach_recursive_mnt(mnt, path, NULL);
out_unlock: out_unlock:
mutex_unlock(&path->dentry->d_inode->i_mutex); mutex_unlock(&path->dentry->d_inode->i_mutex);
@ -1566,7 +1566,7 @@ static int do_move_mount(struct path *path, char *old_name)
if (IS_DEADDIR(path->dentry->d_inode)) if (IS_DEADDIR(path->dentry->d_inode))
goto out1; goto out1;
if (!IS_ROOT(path->dentry) && d_unhashed(path->dentry)) if (d_unlinked(path->dentry))
goto out1; goto out1;
err = -EINVAL; err = -EINVAL;
@ -2129,9 +2129,9 @@ SYSCALL_DEFINE2(pivot_root, const char __user *, new_root,
error = -ENOENT; error = -ENOENT;
if (IS_DEADDIR(new.dentry->d_inode)) if (IS_DEADDIR(new.dentry->d_inode))
goto out2; goto out2;
if (d_unhashed(new.dentry) && !IS_ROOT(new.dentry)) if (d_unlinked(new.dentry))
goto out2; goto out2;
if (d_unhashed(old.dentry) && !IS_ROOT(old.dentry)) if (d_unlinked(old.dentry))
goto out2; goto out2;
error = -EBUSY; error = -EBUSY;
if (new.mnt == root.mnt || if (new.mnt == root.mnt ||

5
include/linux/dcache.h
View File

@ -353,6 +353,11 @@ static inline int d_unhashed(struct dentry *dentry)
return (dentry->d_flags & DCACHE_UNHASHED); return (dentry->d_flags & DCACHE_UNHASHED);
} }
static inline int d_unlinked(struct dentry *dentry)
{
return d_unhashed(dentry) && !IS_ROOT(dentry);
}
static inline struct dentry *dget_parent(struct dentry *dentry) static inline struct dentry *dget_parent(struct dentry *dentry)
{ {
struct dentry *ret; struct dentry *ret;