From: Nick Piggin <npiggin@xxxxxxx>
Filesystems outside the regular namespace do not have to clear
DCACHE_UNHASHED in order to have a working /proc/$pid/fd/XXX. Nothing in
proc prevents the fd link from being used if its dentry is not in the
hash.
Also, it does not get put into the dcache hash if DCACHE_UNHASHED is
clear; that depends on the filesystem calling d_add or d_rehash.
So delete the misleading comments and needless code.
Acked-by: Miklos Szeredi <mszeredi@xxxxxxx>
Signed-off-by: Nick Piggin <npiggin@xxxxxxx>
Cc: Davide Libenzi <davidel@xxxxxxxxxxxxxxx>
Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
Cc: Jens Axboe <jens.axboe@xxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/anon_inodes.c | 16 ----------------
fs/pipe.c | 18 ------------------
net/socket.c | 19 -------------------
3 files changed, 53 deletions(-)
diff -puN fs/anon_inodes.c~fs-remove-unneeded-dcache_unhashed-tricks fs/anon_inodes.c
--- a/fs/anon_inodes.c~fs-remove-unneeded-dcache_unhashed-tricks
+++ a/fs/anon_inodes.c
@@ -35,24 +35,11 @@ static int anon_inodefs_get_sb(struct fi
mnt);
}
-static int anon_inodefs_delete_dentry(struct dentry *dentry)
-{
- /*
- * We faked vfs to believe the dentry was hashed when we created it.
- * Now we restore the flag so that dput() will work correctly.
- */
- dentry->d_flags |= DCACHE_UNHASHED;
- return 1;
-}
-
static struct file_system_type anon_inode_fs_type = {
.name = "anon_inodefs",
.get_sb = anon_inodefs_get_sb,
.kill_sb = kill_anon_super,
};
-static const struct dentry_operations anon_inodefs_dentry_operations = {
- .d_delete = anon_inodefs_delete_dentry,
-};
/*
* nop .set_page_dirty method so that people can use .page_mkwrite on
@@ -117,9 +104,6 @@ struct file *anon_inode_getfile(const ch
*/
atomic_inc(&anon_inode_inode->i_count);
- dentry->d_op = &anon_inodefs_dentry_operations;
- /* Do not publish this dentry inside the global dentry hash table */
- dentry->d_flags &= ~DCACHE_UNHASHED;
d_instantiate(dentry, anon_inode_inode);
error = -ENFILE;
diff -puN fs/pipe.c~fs-remove-unneeded-dcache_unhashed-tricks fs/pipe.c
--- a/fs/pipe.c~fs-remove-unneeded-dcache_unhashed-tricks
+++ a/fs/pipe.c
@@ -906,17 +906,6 @@ void free_pipe_info(struct inode *inode)
}
static struct vfsmount *pipe_mnt __read_mostly;
-static int pipefs_delete_dentry(struct dentry *dentry)
-{
- /*
- * 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;
-}
/*
* pipefs_dname() is called from d_path().
@@ -928,7 +917,6 @@ static char *pipefs_dname(struct dentry
}
static const struct dentry_operations pipefs_dentry_operations = {
- .d_delete = pipefs_delete_dentry,
.d_dname = pipefs_dname,
};
@@ -988,12 +976,6 @@ struct file *create_write_pipe(int flags
goto err_inode;
dentry->d_op = &pipefs_dentry_operations;
- /*
- * 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);
err = -ENFILE;
diff -puN net/socket.c~fs-remove-unneeded-dcache_unhashed-tricks net/socket.c
--- a/net/socket.c~fs-remove-unneeded-dcache_unhashed-tricks
+++ a/net/socket.c
@@ -312,18 +312,6 @@ static struct file_system_type sock_fs_t
.kill_sb = kill_anon_super,
};
-static int sockfs_delete_dentry(struct dentry *dentry)
-{
- /*
- * 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;
-}
-
/*
* sockfs_dname() is called from d_path().
*/
@@ -334,7 +322,6 @@ static char *sockfs_dname(struct dentry
}
static const struct dentry_operations sockfs_dentry_operations = {
- .d_delete = sockfs_delete_dentry,
.d_dname = sockfs_dname,
};
@@ -383,12 +370,6 @@ static int sock_attach_fd(struct socket
return -ENOMEM;
dentry->d_op = &sockfs_dentry_operations;
- /*
- * We dont want to push 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 sockets
- */
- dentry->d_flags &= ~DCACHE_UNHASHED;
d_instantiate(dentry, SOCK_INODE(sock));
sock->file = file;
_
--
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