forked from luck/tmp_suning_uos_patched
5bc2afc2b5
Determine if we've created a new file by examining the directory change attribute and/or the O_EXCL flag. This fixes a regression when doing a non-exclusive create of a new file. If the FILE_CREATED flag is not set, the atomic_open() command will perform full file access permissions checks instead of just checking for MAY_OPEN. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
139 lines
3.1 KiB
C
139 lines
3.1 KiB
C
/*
|
|
* linux/fs/nfs/file.c
|
|
*
|
|
* Copyright (C) 1992 Rick Sladkey
|
|
*/
|
|
#include <linux/nfs_fs.h>
|
|
#include "internal.h"
|
|
#include "fscache.h"
|
|
#include "pnfs.h"
|
|
|
|
#define NFSDBG_FACILITY NFSDBG_FILE
|
|
|
|
static int
|
|
nfs4_file_open(struct inode *inode, struct file *filp)
|
|
{
|
|
struct nfs_open_context *ctx;
|
|
struct dentry *dentry = filp->f_path.dentry;
|
|
struct dentry *parent = NULL;
|
|
struct inode *dir;
|
|
unsigned openflags = filp->f_flags;
|
|
struct iattr attr;
|
|
int opened = 0;
|
|
int err;
|
|
|
|
/*
|
|
* If no cached dentry exists or if it's negative, NFSv4 handled the
|
|
* opens in ->lookup() or ->create().
|
|
*
|
|
* We only get this far for a cached positive dentry. We skipped
|
|
* revalidation, so handle it here by dropping the dentry and returning
|
|
* -EOPENSTALE. The VFS will retry the lookup/create/open.
|
|
*/
|
|
|
|
dprintk("NFS: open file(%s/%s)\n",
|
|
dentry->d_parent->d_name.name,
|
|
dentry->d_name.name);
|
|
|
|
if ((openflags & O_ACCMODE) == 3)
|
|
openflags--;
|
|
|
|
/* We can't create new files here */
|
|
openflags &= ~(O_CREAT|O_EXCL);
|
|
|
|
parent = dget_parent(dentry);
|
|
dir = parent->d_inode;
|
|
|
|
ctx = alloc_nfs_open_context(filp->f_path.dentry, filp->f_mode);
|
|
err = PTR_ERR(ctx);
|
|
if (IS_ERR(ctx))
|
|
goto out;
|
|
|
|
attr.ia_valid = ATTR_OPEN;
|
|
if (openflags & O_TRUNC) {
|
|
attr.ia_valid |= ATTR_SIZE;
|
|
attr.ia_size = 0;
|
|
nfs_wb_all(inode);
|
|
}
|
|
|
|
inode = NFS_PROTO(dir)->open_context(dir, ctx, openflags, &attr, &opened);
|
|
if (IS_ERR(inode)) {
|
|
err = PTR_ERR(inode);
|
|
switch (err) {
|
|
case -EPERM:
|
|
case -EACCES:
|
|
case -EDQUOT:
|
|
case -ENOSPC:
|
|
case -EROFS:
|
|
goto out_put_ctx;
|
|
default:
|
|
goto out_drop;
|
|
}
|
|
}
|
|
if (inode != dentry->d_inode)
|
|
goto out_drop;
|
|
|
|
nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
|
|
nfs_file_set_open_context(filp, ctx);
|
|
nfs_fscache_set_inode_cookie(inode, filp);
|
|
err = 0;
|
|
|
|
out_put_ctx:
|
|
put_nfs_open_context(ctx);
|
|
out:
|
|
dput(parent);
|
|
return err;
|
|
|
|
out_drop:
|
|
d_drop(dentry);
|
|
err = -EOPENSTALE;
|
|
goto out_put_ctx;
|
|
}
|
|
|
|
static int
|
|
nfs4_file_fsync(struct file *file, loff_t start, loff_t end, int datasync)
|
|
{
|
|
int ret;
|
|
struct inode *inode = file_inode(file);
|
|
|
|
do {
|
|
ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
|
|
if (ret != 0)
|
|
break;
|
|
mutex_lock(&inode->i_mutex);
|
|
ret = nfs_file_fsync_commit(file, start, end, datasync);
|
|
if (!ret && !datasync)
|
|
/* application has asked for meta-data sync */
|
|
ret = pnfs_layoutcommit_inode(inode, true);
|
|
mutex_unlock(&inode->i_mutex);
|
|
/*
|
|
* If nfs_file_fsync_commit detected a server reboot, then
|
|
* resend all dirty pages that might have been covered by
|
|
* the NFS_CONTEXT_RESEND_WRITES flag
|
|
*/
|
|
start = 0;
|
|
end = LLONG_MAX;
|
|
} while (ret == -EAGAIN);
|
|
|
|
return ret;
|
|
}
|
|
|
|
const struct file_operations nfs4_file_operations = {
|
|
.llseek = nfs_file_llseek,
|
|
.read = do_sync_read,
|
|
.write = do_sync_write,
|
|
.aio_read = nfs_file_read,
|
|
.aio_write = nfs_file_write,
|
|
.mmap = nfs_file_mmap,
|
|
.open = nfs4_file_open,
|
|
.flush = nfs_file_flush,
|
|
.release = nfs_file_release,
|
|
.fsync = nfs4_file_fsync,
|
|
.lock = nfs_lock,
|
|
.flock = nfs_flock,
|
|
.splice_read = nfs_file_splice_read,
|
|
.splice_write = nfs_file_splice_write,
|
|
.check_flags = nfs_check_flags,
|
|
.setlease = nfs_setlease,
|
|
};
|