mirror of
https://github.com/torvalds/linux.git
synced 2024-11-17 17:41:44 +00:00
16b9057804
Pull vfs updates from Al Viro:
"This the bunch that sat in -next + lock_parent() fix. This is the
minimal set; there's more pending stuff.
In particular, I really hope to get acct.c fixes merged this cycle -
we need that to deal sanely with delayed-mntput stuff. In the next
pile, hopefully - that series is fairly short and localized
(kernel/acct.c, fs/super.c and fs/namespace.c). In this pile: more
iov_iter work. Most of prereqs for ->splice_write with sane locking
order are there and Kent's dio rewrite would also fit nicely on top of
this pile"
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (70 commits)
lock_parent: don't step on stale ->d_parent of all-but-freed one
kill generic_file_splice_write()
ceph: switch to iter_file_splice_write()
shmem: switch to iter_file_splice_write()
nfs: switch to iter_splice_write_file()
fs/splice.c: remove unneeded exports
ocfs2: switch to iter_file_splice_write()
->splice_write() via ->write_iter()
bio_vec-backed iov_iter
optimize copy_page_{to,from}_iter()
bury generic_file_aio_{read,write}
lustre: get rid of messing with iovecs
ceph: switch to ->write_iter()
ceph_sync_direct_write: stop poking into iov_iter guts
ceph_sync_read: stop poking into iov_iter guts
new helper: copy_page_from_iter()
fuse: switch to ->write_iter()
btrfs: switch to ->write_iter()
ocfs2: switch to ->write_iter()
xfs: switch to ->write_iter()
...
136 lines
3.0 KiB
C
136 lines
3.0 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(%pd2)\n", dentry);
|
|
|
|
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_open_file(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)
|
|
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 = new_sync_read,
|
|
.write = new_sync_write,
|
|
.read_iter = nfs_file_read,
|
|
.write_iter = 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 = iter_file_splice_write,
|
|
.check_flags = nfs_check_flags,
|
|
.setlease = nfs_setlease,
|
|
};
|