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authorLinus Torvalds <torvalds@linux-foundation.org>2016-12-17 19:16:12 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2016-12-17 19:16:12 -0800
commit231753ef780012eb6f3922c3dfc0a7186baa33c2 (patch)
treec580186402ac9c5d7392ba4516dd3c88588807ba
parent0110c350c86d511be2130cb2a30dcbb76c4af750 (diff)
parentd16744ec8ad011793144bb932ce822cc0c1733cb (diff)
downloadop-kernel-dev-231753ef780012eb6f3922c3dfc0a7186baa33c2.zip
op-kernel-dev-231753ef780012eb6f3922c3dfc0a7186baa33c2.tar.gz
Merge uncontroversial parts of branch 'readlink' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs
Pull partial readlink cleanups from Miklos Szeredi. This is the uncontroversial part of the readlink cleanup patch-set that simplifies the default readlink handling. Miklos and Al are still discussing the rest of the series. * git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs: vfs: make generic_readlink() static vfs: remove ".readlink = generic_readlink" assignments vfs: default to generic_readlink() vfs: replace calling i_op->readlink with vfs_readlink() proc/self: use generic_readlink ecryptfs: use vfs_get_link() bad_inode: add missing i_op initializers
-rw-r--r--Documentation/filesystems/porting4
-rw-r--r--Documentation/filesystems/vfs.txt9
-rw-r--r--drivers/staging/lustre/lustre/llite/symlink.c1
-rw-r--r--fs/9p/vfs_inode.c1
-rw-r--r--fs/9p/vfs_inode_dotl.c1
-rw-r--r--fs/affs/symlink.c1
-rw-r--r--fs/autofs4/symlink.c1
-rw-r--r--fs/bad_inode.c55
-rw-r--r--fs/btrfs/inode.c1
-rw-r--r--fs/ceph/inode.c1
-rw-r--r--fs/cifs/cifsfs.c1
-rw-r--r--fs/coda/cnode.c1
-rw-r--r--fs/configfs/symlink.c1
-rw-r--r--fs/ecryptfs/inode.c30
-rw-r--r--fs/ext2/symlink.c2
-rw-r--r--fs/ext4/symlink.c3
-rw-r--r--fs/f2fs/namei.c2
-rw-r--r--fs/fuse/dir.c1
-rw-r--r--fs/gfs2/inode.c1
-rw-r--r--fs/hostfs/hostfs_kern.c1
-rw-r--r--fs/jffs2/symlink.c1
-rw-r--r--fs/jfs/symlink.c2
-rw-r--r--fs/kernfs/symlink.c1
-rw-r--r--fs/libfs.c1
-rw-r--r--fs/minix/inode.c1
-rw-r--r--fs/namei.c35
-rw-r--r--fs/ncpfs/inode.c1
-rw-r--r--fs/nfs/symlink.c1
-rw-r--r--fs/nfsd/nfs4xdr.c8
-rw-r--r--fs/nfsd/vfs.c6
-rw-r--r--fs/nilfs2/namei.c1
-rw-r--r--fs/ocfs2/symlink.c1
-rw-r--r--fs/orangefs/symlink.c1
-rw-r--r--fs/overlayfs/inode.c1
-rw-r--r--fs/proc/inode.c1
-rw-r--r--fs/proc/self.c13
-rw-r--r--fs/proc/thread_self.c14
-rw-r--r--fs/reiserfs/namei.c1
-rw-r--r--fs/squashfs/symlink.c1
-rw-r--r--fs/stat.c8
-rw-r--r--fs/sysv/inode.c1
-rw-r--r--fs/ubifs/file.c1
-rw-r--r--fs/xfs/xfs_ioctl.c4
-rw-r--r--fs/xfs/xfs_iops.c2
-rw-r--r--include/linux/fs.h3
-rw-r--r--mm/shmem.c2
46 files changed, 120 insertions, 110 deletions
diff --git a/Documentation/filesystems/porting b/Documentation/filesystems/porting
index bdd025c..9528007 100644
--- a/Documentation/filesystems/porting
+++ b/Documentation/filesystems/porting
@@ -596,3 +596,7 @@ in your dentry operations instead.
[mandatory]
->rename() has an added flags argument. Any flags not handled by the
filesystem should result in EINVAL being returned.
+--
+[recommended]
+ ->readlink is optional for symlinks. Don't set, unless filesystem needs
+ to fake something for readlink(2).
diff --git a/Documentation/filesystems/vfs.txt b/Documentation/filesystems/vfs.txt
index 3893f4d..b968084 100644
--- a/Documentation/filesystems/vfs.txt
+++ b/Documentation/filesystems/vfs.txt
@@ -451,9 +451,6 @@ otherwise noted.
exist; this is checked by the VFS. Unlike plain rename,
source and target may be of different type.
- readlink: called by the readlink(2) system call. Only required if
- you want to support reading symbolic links
-
get_link: called by the VFS to follow a symbolic link to the
inode it points to. Only required if you want to support
symbolic links. This method returns the symlink body
@@ -468,6 +465,12 @@ otherwise noted.
argument. If request can't be handled without leaving RCU mode,
have it return ERR_PTR(-ECHILD).
+ readlink: this is now just an override for use by readlink(2) for the
+ cases when ->get_link uses nd_jump_link() or object is not in
+ fact a symlink. Normally filesystems should only implement
+ ->get_link for symlinks and readlink(2) will automatically use
+ that.
+
permission: called by the VFS to check for access rights on a POSIX-like
filesystem.
diff --git a/drivers/staging/lustre/lustre/llite/symlink.c b/drivers/staging/lustre/lustre/llite/symlink.c
index 82c7c48..cd77b55 100644
--- a/drivers/staging/lustre/lustre/llite/symlink.c
+++ b/drivers/staging/lustre/lustre/llite/symlink.c
@@ -149,7 +149,6 @@ static const char *ll_get_link(struct dentry *dentry,
}
const struct inode_operations ll_fast_symlink_inode_operations = {
- .readlink = generic_readlink,
.setattr = ll_setattr,
.get_link = ll_get_link,
.getattr = ll_getattr,
diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c
index 30ca770..f4f4450 100644
--- a/fs/9p/vfs_inode.c
+++ b/fs/9p/vfs_inode.c
@@ -1464,7 +1464,6 @@ static const struct inode_operations v9fs_file_inode_operations = {
};
static const struct inode_operations v9fs_symlink_inode_operations = {
- .readlink = generic_readlink,
.get_link = v9fs_vfs_get_link,
.getattr = v9fs_vfs_getattr,
.setattr = v9fs_vfs_setattr,
diff --git a/fs/9p/vfs_inode_dotl.c b/fs/9p/vfs_inode_dotl.c
index afaa4b6..5999bd0 100644
--- a/fs/9p/vfs_inode_dotl.c
+++ b/fs/9p/vfs_inode_dotl.c
@@ -979,7 +979,6 @@ const struct inode_operations v9fs_file_inode_operations_dotl = {
};
const struct inode_operations v9fs_symlink_inode_operations_dotl = {
- .readlink = generic_readlink,
.get_link = v9fs_vfs_get_link_dotl,
.getattr = v9fs_vfs_getattr_dotl,
.setattr = v9fs_vfs_setattr_dotl,
diff --git a/fs/affs/symlink.c b/fs/affs/symlink.c
index 69b03db..ae622cd 100644
--- a/fs/affs/symlink.c
+++ b/fs/affs/symlink.c
@@ -70,7 +70,6 @@ const struct address_space_operations affs_symlink_aops = {
};
const struct inode_operations affs_symlink_inode_operations = {
- .readlink = generic_readlink,
.get_link = page_get_link,
.setattr = affs_notify_change,
};
diff --git a/fs/autofs4/symlink.c b/fs/autofs4/symlink.c
index 99aab00..ab0b428 100644
--- a/fs/autofs4/symlink.c
+++ b/fs/autofs4/symlink.c
@@ -25,6 +25,5 @@ static const char *autofs4_get_link(struct dentry *dentry,
}
const struct inode_operations autofs4_symlink_inode_operations = {
- .readlink = generic_readlink,
.get_link = autofs4_get_link
};
diff --git a/fs/bad_inode.c b/fs/bad_inode.c
index 8712062..5f685c8 100644
--- a/fs/bad_inode.c
+++ b/fs/bad_inode.c
@@ -106,6 +106,50 @@ static ssize_t bad_inode_listxattr(struct dentry *dentry, char *buffer,
return -EIO;
}
+static const char *bad_inode_get_link(struct dentry *dentry,
+ struct inode *inode,
+ struct delayed_call *done)
+{
+ return ERR_PTR(-EIO);
+}
+
+static struct posix_acl *bad_inode_get_acl(struct inode *inode, int type)
+{
+ return ERR_PTR(-EIO);
+}
+
+static int bad_inode_fiemap(struct inode *inode,
+ struct fiemap_extent_info *fieinfo, u64 start,
+ u64 len)
+{
+ return -EIO;
+}
+
+static int bad_inode_update_time(struct inode *inode, struct timespec *time,
+ int flags)
+{
+ return -EIO;
+}
+
+static int bad_inode_atomic_open(struct inode *inode, struct dentry *dentry,
+ struct file *file, unsigned int open_flag,
+ umode_t create_mode, int *opened)
+{
+ return -EIO;
+}
+
+static int bad_inode_tmpfile(struct inode *inode, struct dentry *dentry,
+ umode_t mode)
+{
+ return -EIO;
+}
+
+static int bad_inode_set_acl(struct inode *inode, struct posix_acl *acl,
+ int type)
+{
+ return -EIO;
+}
+
static const struct inode_operations bad_inode_ops =
{
.create = bad_inode_create,
@@ -118,14 +162,17 @@ static const struct inode_operations bad_inode_ops =
.mknod = bad_inode_mknod,
.rename = bad_inode_rename2,
.readlink = bad_inode_readlink,
- /* follow_link must be no-op, otherwise unmounting this inode
- won't work */
- /* put_link returns void */
- /* truncate returns void */
.permission = bad_inode_permission,
.getattr = bad_inode_getattr,
.setattr = bad_inode_setattr,
.listxattr = bad_inode_listxattr,
+ .get_link = bad_inode_get_link,
+ .get_acl = bad_inode_get_acl,
+ .fiemap = bad_inode_fiemap,
+ .update_time = bad_inode_update_time,
+ .atomic_open = bad_inode_atomic_open,
+ .tmpfile = bad_inode_tmpfile,
+ .set_acl = bad_inode_set_acl,
};
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index c3b6ffa..f2b281a 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -10653,7 +10653,6 @@ static const struct inode_operations btrfs_special_inode_operations = {
.update_time = btrfs_update_time,
};
static const struct inode_operations btrfs_symlink_inode_operations = {
- .readlink = generic_readlink,
.get_link = page_get_link,
.getattr = btrfs_getattr,
.setattr = btrfs_setattr,
diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c
index 284f0d8..398e532 100644
--- a/fs/ceph/inode.c
+++ b/fs/ceph/inode.c
@@ -1869,7 +1869,6 @@ retry:
* symlinks
*/
static const struct inode_operations ceph_symlink_iops = {
- .readlink = generic_readlink,
.get_link = simple_get_link,
.setattr = ceph_setattr,
.getattr = ceph_getattr,
diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index 15261ba..e6efb9a 100644
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -914,7 +914,6 @@ const struct inode_operations cifs_file_inode_ops = {
};
const struct inode_operations cifs_symlink_inode_ops = {
- .readlink = generic_readlink,
.get_link = cifs_get_link,
.permission = cifs_permission,
.listxattr = cifs_listxattr,
diff --git a/fs/coda/cnode.c b/fs/coda/cnode.c
index 1bfb7ba..f13e090 100644
--- a/fs/coda/cnode.c
+++ b/fs/coda/cnode.c
@@ -17,7 +17,6 @@ static inline int coda_fideq(struct CodaFid *fid1, struct CodaFid *fid2)
}
static const struct inode_operations coda_symlink_inode_operations = {
- .readlink = generic_readlink,
.get_link = page_get_link,
.setattr = coda_setattr,
};
diff --git a/fs/configfs/symlink.c b/fs/configfs/symlink.c
index db6d692..a6ab012 100644
--- a/fs/configfs/symlink.c
+++ b/fs/configfs/symlink.c
@@ -305,7 +305,6 @@ static const char *configfs_get_link(struct dentry *dentry,
const struct inode_operations configfs_symlink_inode_operations = {
.get_link = configfs_get_link,
- .readlink = generic_readlink,
.setattr = configfs_setattr,
};
diff --git a/fs/ecryptfs/inode.c b/fs/ecryptfs/inode.c
index cf390dc..e7413f8 100644
--- a/fs/ecryptfs/inode.c
+++ b/fs/ecryptfs/inode.c
@@ -631,28 +631,23 @@ out_lock:
static char *ecryptfs_readlink_lower(struct dentry *dentry, size_t *bufsiz)
{
+ DEFINE_DELAYED_CALL(done);
struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
- char *lower_buf;
+ const char *link;
char *buf;
- mm_segment_t old_fs;
int rc;
- lower_buf = kmalloc(PATH_MAX, GFP_KERNEL);
- if (!lower_buf)
- return ERR_PTR(-ENOMEM);
- old_fs = get_fs();
- set_fs(get_ds());
- rc = d_inode(lower_dentry)->i_op->readlink(lower_dentry,
- (char __user *)lower_buf,
- PATH_MAX);
- set_fs(old_fs);
- if (rc < 0)
- goto out;
+ link = vfs_get_link(lower_dentry, &done);
+ if (IS_ERR(link))
+ return ERR_CAST(link);
+
rc = ecryptfs_decode_and_decrypt_filename(&buf, bufsiz, dentry->d_sb,
- lower_buf, rc);
-out:
- kfree(lower_buf);
- return rc ? ERR_PTR(rc) : buf;
+ link, strlen(link));
+ do_delayed_call(&done);
+ if (rc)
+ return ERR_PTR(rc);
+
+ return buf;
}
static const char *ecryptfs_get_link(struct dentry *dentry,
@@ -1089,7 +1084,6 @@ out:
}
const struct inode_operations ecryptfs_symlink_iops = {
- .readlink = generic_readlink,
.get_link = ecryptfs_get_link,
.permission = ecryptfs_permission,
.setattr = ecryptfs_setattr,
diff --git a/fs/ext2/symlink.c b/fs/ext2/symlink.c
index 8437b19..eeffb01 100644
--- a/fs/ext2/symlink.c
+++ b/fs/ext2/symlink.c
@@ -21,7 +21,6 @@
#include "xattr.h"
const struct inode_operations ext2_symlink_inode_operations = {
- .readlink = generic_readlink,
.get_link = page_get_link,
.setattr = ext2_setattr,
#ifdef CONFIG_EXT2_FS_XATTR
@@ -30,7 +29,6 @@ const struct inode_operations ext2_symlink_inode_operations = {
};
const struct inode_operations ext2_fast_symlink_inode_operations = {
- .readlink = generic_readlink,
.get_link = simple_get_link,
.setattr = ext2_setattr,
#ifdef CONFIG_EXT2_FS_XATTR
diff --git a/fs/ext4/symlink.c b/fs/ext4/symlink.c
index 557b3b0..73b184d 100644
--- a/fs/ext4/symlink.c
+++ b/fs/ext4/symlink.c
@@ -83,21 +83,18 @@ errout:
}
const struct inode_operations ext4_encrypted_symlink_inode_operations = {
- .readlink = generic_readlink,
.get_link = ext4_encrypted_get_link,
.setattr = ext4_setattr,
.listxattr = ext4_listxattr,
};
const struct inode_operations ext4_symlink_inode_operations = {
- .readlink = generic_readlink,
.get_link = page_get_link,
.setattr = ext4_setattr,
.listxattr = ext4_listxattr,
};
const struct inode_operations ext4_fast_symlink_inode_operations = {
- .readlink = generic_readlink,
.get_link = simple_get_link,
.setattr = ext4_setattr,
.listxattr = ext4_listxattr,
diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c
index db33b56..56c19b0 100644
--- a/fs/f2fs/namei.c
+++ b/fs/f2fs/namei.c
@@ -1075,7 +1075,6 @@ errout:
}
const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
- .readlink = generic_readlink,
.get_link = f2fs_encrypted_get_link,
.getattr = f2fs_getattr,
.setattr = f2fs_setattr,
@@ -1105,7 +1104,6 @@ const struct inode_operations f2fs_dir_inode_operations = {
};
const struct inode_operations f2fs_symlink_inode_operations = {
- .readlink = generic_readlink,
.get_link = f2fs_get_link,
.getattr = f2fs_getattr,
.setattr = f2fs_setattr,
diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index 096f799..1f7c732 100644
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -1831,7 +1831,6 @@ static const struct inode_operations fuse_common_inode_operations = {
static const struct inode_operations fuse_symlink_inode_operations = {
.setattr = fuse_setattr,
.get_link = fuse_get_link,
- .readlink = generic_readlink,
.getattr = fuse_getattr,
.listxattr = fuse_listxattr,
};
diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c
index fe3f849..6cd9f84 100644
--- a/fs/gfs2/inode.c
+++ b/fs/gfs2/inode.c
@@ -2067,7 +2067,6 @@ const struct inode_operations gfs2_dir_iops = {
};
const struct inode_operations gfs2_symlink_iops = {
- .readlink = generic_readlink,
.get_link = gfs2_get_link,
.permission = gfs2_permission,
.setattr = gfs2_setattr,
diff --git a/fs/hostfs/hostfs_kern.c b/fs/hostfs/hostfs_kern.c
index 23e15ea..e61261a 100644
--- a/fs/hostfs/hostfs_kern.c
+++ b/fs/hostfs/hostfs_kern.c
@@ -920,7 +920,6 @@ static const char *hostfs_get_link(struct dentry *dentry,
}
static const struct inode_operations hostfs_link_iops = {
- .readlink = generic_readlink,
.get_link = hostfs_get_link,
};
diff --git a/fs/jffs2/symlink.c b/fs/jffs2/symlink.c
index 8f3f085..d2fa138a 100644
--- a/fs/jffs2/symlink.c
+++ b/fs/jffs2/symlink.c
@@ -13,7 +13,6 @@
const struct inode_operations jffs2_symlink_inode_operations =
{
- .readlink = generic_readlink,
.get_link = simple_get_link,
.setattr = jffs2_setattr,
.listxattr = jffs2_listxattr,
diff --git a/fs/jfs/symlink.c b/fs/jfs/symlink.c
index c82404f..3832060 100644
--- a/fs/jfs/symlink.c
+++ b/fs/jfs/symlink.c
@@ -22,14 +22,12 @@
#include "jfs_xattr.h"
const struct inode_operations jfs_fast_symlink_inode_operations = {
- .readlink = generic_readlink,
.get_link = simple_get_link,
.setattr = jfs_setattr,
.listxattr = jfs_listxattr,
};
const struct inode_operations jfs_symlink_inode_operations = {
- .readlink = generic_readlink,
.get_link = page_get_link,
.setattr = jfs_setattr,
.listxattr = jfs_listxattr,
diff --git a/fs/kernfs/symlink.c b/fs/kernfs/symlink.c
index 9b43ca0..1684af4 100644
--- a/fs/kernfs/symlink.c
+++ b/fs/kernfs/symlink.c
@@ -135,7 +135,6 @@ static const char *kernfs_iop_get_link(struct dentry *dentry,
const struct inode_operations kernfs_symlink_iops = {
.listxattr = kernfs_iop_listxattr,
- .readlink = generic_readlink,
.get_link = kernfs_iop_get_link,
.setattr = kernfs_iop_setattr,
.getattr = kernfs_iop_getattr,
diff --git a/fs/libfs.c b/fs/libfs.c
index 76048705..6637aa6 100644
--- a/fs/libfs.c
+++ b/fs/libfs.c
@@ -1131,7 +1131,6 @@ EXPORT_SYMBOL(simple_get_link);
const struct inode_operations simple_symlink_inode_operations = {
.get_link = simple_get_link,
- .readlink = generic_readlink
};
EXPORT_SYMBOL(simple_symlink_inode_operations);
diff --git a/fs/minix/inode.c b/fs/minix/inode.c
index f975d66..e7d9bf8 100644
--- a/fs/minix/inode.c
+++ b/fs/minix/inode.c
@@ -434,7 +434,6 @@ static const struct address_space_operations minix_aops = {
};
static const struct inode_operations minix_symlink_inode_operations = {
- .readlink = generic_readlink,
.get_link = page_get_link,
.getattr = minix_getattr,
};
diff --git a/fs/namei.c b/fs/namei.c
index 1c372de..d9fc761 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -4606,7 +4606,8 @@ out:
* have ->get_link() not calling nd_jump_link(). Using (or not using) it
* for any given inode is up to filesystem.
*/
-int generic_readlink(struct dentry *dentry, char __user *buffer, int buflen)
+static int generic_readlink(struct dentry *dentry, char __user *buffer,
+ int buflen)
{
DEFINE_DELAYED_CALL(done);
struct inode *inode = d_inode(dentry);
@@ -4622,7 +4623,36 @@ int generic_readlink(struct dentry *dentry, char __user *buffer, int buflen)
do_delayed_call(&done);
return res;
}
-EXPORT_SYMBOL(generic_readlink);
+
+/**
+ * vfs_readlink - copy symlink body into userspace buffer
+ * @dentry: dentry on which to get symbolic link
+ * @buffer: user memory pointer
+ * @buflen: size of buffer
+ *
+ * Does not touch atime. That's up to the caller if necessary
+ *
+ * Does not call security hook.
+ */
+int vfs_readlink(struct dentry *dentry, char __user *buffer, int buflen)
+{
+ struct inode *inode = d_inode(dentry);
+
+ if (unlikely(!(inode->i_opflags & IOP_DEFAULT_READLINK))) {
+ if (unlikely(inode->i_op->readlink))
+ return inode->i_op->readlink(dentry, buffer, buflen);
+
+ if (!d_is_symlink(dentry))
+ return -EINVAL;
+
+ spin_lock(&inode->i_lock);
+ inode->i_opflags |= IOP_DEFAULT_READLINK;
+ spin_unlock(&inode->i_lock);
+ }
+
+ return generic_readlink(dentry, buffer, buflen);
+}
+EXPORT_SYMBOL(vfs_readlink);
/**
* vfs_get_link - get symlink body
@@ -4739,7 +4769,6 @@ int page_symlink(struct inode *inode, const char *symname, int len)
EXPORT_SYMBOL(page_symlink);
const struct inode_operations page_symlink_inode_operations = {
- .readlink = generic_readlink,
.get_link = page_get_link,
};
EXPORT_SYMBOL(page_symlink_inode_operations);
diff --git a/fs/ncpfs/inode.c b/fs/ncpfs/inode.c
index f6cf4c7e..ba611bf 100644
--- a/fs/ncpfs/inode.c
+++ b/fs/ncpfs/inode.c
@@ -243,7 +243,6 @@ static void ncp_set_attr(struct inode *inode, struct ncp_entry_info *nwinfo)
#if defined(CONFIG_NCPFS_EXTRAS) || defined(CONFIG_NCPFS_NFS_NS)
static const struct inode_operations ncp_symlink_inode_operations = {
- .readlink = generic_readlink,
.get_link = page_get_link,
.setattr = ncp_notify_change,
};
diff --git a/fs/nfs/symlink.c b/fs/nfs/symlink.c
index 4fe3eea..5a1d0de 100644
--- a/fs/nfs/symlink.c
+++ b/fs/nfs/symlink.c
@@ -77,7 +77,6 @@ static const char *nfs_get_link(struct dentry *dentry,
* symlinks can't do much...
*/
const struct inode_operations nfs_symlink_inode_operations = {
- .readlink = generic_readlink,
.get_link = nfs_get_link,
.getattr = nfs_getattr,
.setattr = nfs_setattr,
diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index 79edde4..7ecf16b 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -3605,10 +3605,10 @@ nfsd4_encode_readlink(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd
if (!p)
return nfserr_resource;
/*
- * XXX: By default, the ->readlink() VFS op will truncate symlinks
- * if they would overflow the buffer. Is this kosher in NFSv4? If
- * not, one easy fix is: if ->readlink() precisely fills the buffer,
- * assume that truncation occurred, and return NFS4ERR_RESOURCE.
+ * XXX: By default, vfs_readlink() will truncate symlinks if they
+ * would overflow the buffer. Is this kosher in NFSv4? If not, one
+ * easy fix is: if vfs_readlink() precisely fills the buffer, assume
+ * that truncation occurred, and return NFS4ERR_RESOURCE.
*/
nfserr = nfsd_readlink(readlink->rl_rqstp, readlink->rl_fhp,
(char *)p, &maxcount);
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index 357e844..7a21abe 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -1450,7 +1450,6 @@ do_nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp,
__be32
nfsd_readlink(struct svc_rqst *rqstp, struct svc_fh *fhp, char *buf, int *lenp)
{
- struct inode *inode;
mm_segment_t oldfs;
__be32 err;
int host_err;
@@ -1462,10 +1461,9 @@ nfsd_readlink(struct svc_rqst *rqstp, struct svc_fh *fhp, char *buf, int *lenp)
path.mnt = fhp->fh_export->ex_path.mnt;
path.dentry = fhp->fh_dentry;
- inode = d_inode(path.dentry);
err = nfserr_inval;
- if (!inode->i_op->readlink)
+ if (!d_is_symlink(path.dentry))
goto out;
touch_atime(&path);
@@ -1474,7 +1472,7 @@ nfsd_readlink(struct svc_rqst *rqstp, struct svc_fh *fhp, char *buf, int *lenp)
*/
oldfs = get_fs(); set_fs(KERNEL_DS);
- host_err = inode->i_op->readlink(path.dentry, (char __user *)buf, *lenp);
+ host_err = vfs_readlink(path.dentry, (char __user *)buf, *lenp);
set_fs(oldfs);
if (host_err < 0)
diff --git a/fs/nilfs2/namei.c b/fs/nilfs2/namei.c
index 2b71c60..515d13c 100644
--- a/fs/nilfs2/namei.c
+++ b/fs/nilfs2/namei.c
@@ -568,7 +568,6 @@ const struct inode_operations nilfs_special_inode_operations = {
};
const struct inode_operations nilfs_symlink_inode_operations = {
- .readlink = generic_readlink,
.get_link = page_get_link,
.permission = nilfs_permission,
};
diff --git a/fs/ocfs2/symlink.c b/fs/ocfs2/symlink.c
index 6ad8eec..94cfacc 100644
--- a/fs/ocfs2/symlink.c
+++ b/fs/ocfs2/symlink.c
@@ -87,7 +87,6 @@ const struct address_space_operations ocfs2_fast_symlink_aops = {
};
const struct inode_operations ocfs2_symlink_inode_operations = {
- .readlink = generic_readlink,
.get_link = page_get_link,
.getattr = ocfs2_getattr,
.setattr = ocfs2_setattr,
diff --git a/fs/orangefs/symlink.c b/fs/orangefs/symlink.c
index 10b0b06..02b1bbd 100644
--- a/fs/orangefs/symlink.c
+++ b/fs/orangefs/symlink.c
@@ -9,7 +9,6 @@
#include "orangefs-bufmap.h"
const struct inode_operations orangefs_symlink_inode_operations = {
- .readlink = generic_readlink,
.get_link = simple_get_link,
.setattr = orangefs_setattr,
.getattr = orangefs_getattr,
diff --git a/fs/overlayfs/inode.c b/fs/overlayfs/inode.c
index 1ab8b0d..08643ac 100644
--- a/fs/overlayfs/inode.c
+++ b/fs/overlayfs/inode.c
@@ -296,7 +296,6 @@ static const struct inode_operations ovl_file_inode_operations = {
static const struct inode_operations ovl_symlink_inode_operations = {
.setattr = ovl_setattr,
.get_link = ovl_get_link,
- .readlink = generic_readlink,
.getattr = ovl_getattr,
.listxattr = ovl_listxattr,
.update_time = ovl_update_time,
diff --git a/fs/proc/inode.c b/fs/proc/inode.c
index 783bc19..8733001 100644
--- a/fs/proc/inode.c
+++ b/fs/proc/inode.c
@@ -425,7 +425,6 @@ static const char *proc_get_link(struct dentry *dentry,
}
const struct inode_operations proc_link_inode_operations = {
- .readlink = generic_readlink,
.get_link = proc_get_link,
};
diff --git a/fs/proc/self.c b/fs/proc/self.c
index 4024595..39857f6 100644
--- a/fs/proc/self.c
+++ b/fs/proc/self.c
@@ -6,18 +6,6 @@
/*
* /proc/self:
*/
-static int proc_self_readlink(struct dentry *dentry, char __user *buffer,
- int buflen)
-{
- struct pid_namespace *ns = dentry->d_sb->s_fs_info;
- pid_t tgid = task_tgid_nr_ns(current, ns);
- char tmp[PROC_NUMBUF];
- if (!tgid)
- return -ENOENT;
- sprintf(tmp, "%d", tgid);
- return readlink_copy(buffer, buflen, tmp);
-}
-
static const char *proc_self_get_link(struct dentry *dentry,
struct inode *inode,
struct delayed_call *done)
@@ -38,7 +26,6 @@ static const char *proc_self_get_link(struct dentry *dentry,
}
static const struct inode_operations proc_self_inode_operations = {
- .readlink = proc_self_readlink,
.get_link = proc_self_get_link,
};
diff --git a/fs/proc/thread_self.c b/fs/proc/thread_self.c
index 595b90a97..20614b6 100644
--- a/fs/proc/thread_self.c
+++ b/fs/proc/thread_self.c
@@ -6,19 +6,6 @@
/*
* /proc/thread_self:
*/
-static int proc_thread_self_readlink(struct dentry *dentry, char __user *buffer,
- int buflen)
-{
- struct pid_namespace *ns = dentry->d_sb->s_fs_info;
- pid_t tgid = task_tgid_nr_ns(current, ns);
- pid_t pid = task_pid_nr_ns(current, ns);
- char tmp[PROC_NUMBUF + 6 + PROC_NUMBUF];
- if (!pid)
- return -ENOENT;
- sprintf(tmp, "%d/task/%d", tgid, pid);
- return readlink_copy(buffer, buflen, tmp);
-}
-
static const char *proc_thread_self_get_link(struct dentry *dentry,
struct inode *inode,
struct delayed_call *done)
@@ -40,7 +27,6 @@ static const char *proc_thread_self_get_link(struct dentry *dentry,
}
static const struct inode_operations proc_thread_self_inode_operations = {
- .readlink = proc_thread_self_readlink,
.get_link = proc_thread_self_get_link,
};
diff --git a/fs/reiserfs/namei.c b/fs/reiserfs/namei.c
index e6a2b40..bd39a99 100644
--- a/fs/reiserfs/namei.c
+++ b/fs/reiserfs/namei.c
@@ -1665,7 +1665,6 @@ const struct inode_operations reiserfs_dir_inode_operations = {
* stuff added
*/
const struct inode_operations reiserfs_symlink_inode_operations = {
- .readlink = generic_readlink,
.get_link = page_get_link,
.setattr = reiserfs_setattr,
.listxattr = reiserfs_listxattr,
diff --git a/fs/squashfs/symlink.c b/fs/squashfs/symlink.c
index 79b9c31..befeba0 100644
--- a/fs/squashfs/symlink.c
+++ b/fs/squashfs/symlink.c
@@ -118,7 +118,6 @@ const struct address_space_operations squashfs_symlink_aops = {
};
const struct inode_operations squashfs_symlink_inode_ops = {
- .readlink = generic_readlink,
.get_link = page_get_link,
.listxattr = squashfs_listxattr
};
diff --git a/fs/stat.c b/fs/stat.c
index bc045c7..0b210c3 100644
--- a/fs/stat.c
+++ b/fs/stat.c
@@ -329,12 +329,14 @@ retry:
struct inode *inode = d_backing_inode(path.dentry);
error = empty ? -ENOENT : -EINVAL;
- if (inode->i_op->readlink) {
+ /*
+ * AFS mountpoints allow readlink(2) but are not symlinks
+ */
+ if (d_is_symlink(path.dentry) || inode->i_op->readlink) {
error = security_inode_readlink(path.dentry);
if (!error) {
touch_atime(&path);
- error = inode->i_op->readlink(path.dentry,
- buf, bufsiz);
+ error = vfs_readlink(path.dentry, buf, bufsiz);
}
}
path_put(&path);
diff --git a/fs/sysv/inode.c b/fs/sysv/inode.c
index d62c423..858fb72 100644
--- a/fs/sysv/inode.c
+++ b/fs/sysv/inode.c
@@ -145,7 +145,6 @@ static inline void write3byte(struct sysv_sb_info *sbi,
}
static const struct inode_operations sysv_symlink_inode_operations = {
- .readlink = generic_readlink,
.get_link = page_get_link,
.getattr = sysv_getattr,
};
diff --git a/fs/ubifs/file.c b/fs/ubifs/file.c
index aa0625f..b0d7837 100644
--- a/fs/ubifs/file.c
+++ b/fs/ubifs/file.c
@@ -1733,7 +1733,6 @@ const struct inode_operations ubifs_file_inode_operations = {
};
const struct inode_operations ubifs_symlink_inode_operations = {
- .readlink = generic_readlink,
.get_link = ubifs_get_link,
.setattr = ubifs_setattr,
.getattr = ubifs_getattr,
diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
index fc563b8..c67cfb4 100644
--- a/fs/xfs/xfs_ioctl.c
+++ b/fs/xfs/xfs_ioctl.c
@@ -287,7 +287,7 @@ xfs_readlink_by_handle(
return PTR_ERR(dentry);
/* Restrict this handle operation to symlinks only. */
- if (!d_inode(dentry)->i_op->readlink) {
+ if (!d_is_symlink(dentry)) {
error = -EINVAL;
goto out_dput;
}
@@ -297,7 +297,7 @@ xfs_readlink_by_handle(
goto out_dput;
}
- error = d_inode(dentry)->i_op->readlink(dentry, hreq->ohandle, olen);
+ error = vfs_readlink(dentry, hreq->ohandle, olen);
out_dput:
dput(dentry);
diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c
index b930be0..308bebb 100644
--- a/fs/xfs/xfs_iops.c
+++ b/fs/xfs/xfs_iops.c
@@ -1120,7 +1120,6 @@ static const struct inode_operations xfs_dir_ci_inode_operations = {
};
static const struct inode_operations xfs_symlink_inode_operations = {
- .readlink = generic_readlink,
.get_link = xfs_vn_get_link,
.getattr = xfs_vn_getattr,
.setattr = xfs_vn_setattr,
@@ -1129,7 +1128,6 @@ static const struct inode_operations xfs_symlink_inode_operations = {
};
static const struct inode_operations xfs_inline_symlink_inode_operations = {
- .readlink = generic_readlink,
.get_link = xfs_vn_get_link_inline,
.getattr = xfs_vn_getattr,
.setattr = xfs_vn_setattr,
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 3587896..e6e4146 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -543,6 +543,7 @@ is_uncached_acl(struct posix_acl *acl)
#define IOP_LOOKUP 0x0002
#define IOP_NOFOLLOW 0x0004
#define IOP_XATTR 0x0008
+#define IOP_DEFAULT_READLINK 0x0010
/*
* Keep mostly read-only and often accessed (especially for
@@ -2867,7 +2868,6 @@ extern int __page_symlink(struct inode *inode, const char *symname, int len,
extern int page_symlink(struct inode *inode, const char *symname, int len);
extern const struct inode_operations page_symlink_inode_operations;
extern void kfree_link(void *);
-extern int generic_readlink(struct dentry *, char __user *, int);
extern void generic_fillattr(struct inode *, struct kstat *);
int vfs_getattr_nosec(struct path *path, struct kstat *stat);
extern int vfs_getattr(struct path *, struct kstat *);
@@ -2888,6 +2888,7 @@ extern int vfs_lstat(const char __user *, struct kstat *);
extern int vfs_fstat(unsigned int, struct kstat *);
extern int vfs_fstatat(int , const char __user *, struct kstat *, int);
extern const char *vfs_get_link(struct dentry *, struct delayed_call *);
+extern int vfs_readlink(struct dentry *, char __user *, int);
extern int __generic_block_fiemap(struct inode *inode,
struct fiemap_extent_info *fieinfo,
diff --git a/mm/shmem.c b/mm/shmem.c
index 54287d44..b1b20dc 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -3212,7 +3212,6 @@ static ssize_t shmem_listxattr(struct dentry *dentry, char *buffer, size_t size)
#endif /* CONFIG_TMPFS_XATTR */
static const struct inode_operations shmem_short_symlink_operations = {
- .readlink = generic_readlink,
.get_link = simple_get_link,
#ifdef CONFIG_TMPFS_XATTR
.listxattr = shmem_listxattr,
@@ -3220,7 +3219,6 @@ static const struct inode_operations shmem_short_symlink_operations = {
};
static const struct inode_operations shmem_symlink_inode_operations = {
- .readlink = generic_readlink,
.get_link = shmem_get_link,
#ifdef CONFIG_TMPFS_XATTR
.listxattr = shmem_listxattr,
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