mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-05 18:14:07 +08:00
532d4def2f
An open file description (struct file) in a given process can be associated with two different lock owners. It can have a Posix lock owner which will be different in each process that has a fd on the file. It can have a Flock owner which will be the same in all processes. When searching for a lock stateid to use, we need to consider both of these owners So add a new "flock_owner" to the "nfs_open_context" (of which there is one for each open file description). This flock_owner does not need to be reference-counted as there is a 1-1 relation between 'struct file' and nfs open contexts, and it will never be part of a list of contexts. So there is no need for a 'flock_context' - just the owner is enough. The io_count included in the (Posix) lock_context provides no guarantee that all read-aheads that could use the state have completed, so not supporting it for flock locks in not a serious problem. Synchronization between flock and read-ahead can be added later if needed. When creating an open_context for a non-openning create call, we don't have a 'struct file' to pass in, so the lock context gets initialized with a NULL owner, but this will never be used. The flock_owner is not used at all in this patch, that will come later. Acked-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: NeilBrown <neilb@suse.com> Reviewed-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
264 lines
6.2 KiB
C
264 lines
6.2 KiB
C
/*
|
|
* linux/fs/nfs/file.c
|
|
*
|
|
* Copyright (C) 1992 Rick Sladkey
|
|
*/
|
|
#include <linux/fs.h>
|
|
#include <linux/file.h>
|
|
#include <linux/falloc.h>
|
|
#include <linux/nfs_fs.h>
|
|
#include <uapi/linux/btrfs.h> /* BTRFS_IOC_CLONE/BTRFS_IOC_CLONE_RANGE */
|
|
#include "delegation.h"
|
|
#include "internal.h"
|
|
#include "iostat.h"
|
|
#include "fscache.h"
|
|
#include "pnfs.h"
|
|
|
|
#include "nfstrace.h"
|
|
|
|
#ifdef CONFIG_NFS_V4_2
|
|
#include "nfs42.h"
|
|
#endif
|
|
|
|
#define NFSDBG_FACILITY NFSDBG_FILE
|
|
|
|
static int
|
|
nfs4_file_open(struct inode *inode, struct file *filp)
|
|
{
|
|
struct nfs_open_context *ctx;
|
|
struct dentry *dentry = file_dentry(filp);
|
|
struct dentry *parent = NULL;
|
|
struct inode *dir;
|
|
unsigned openflags = filp->f_flags;
|
|
struct iattr attr;
|
|
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);
|
|
|
|
err = nfs_check_flags(openflags);
|
|
if (err)
|
|
return err;
|
|
|
|
if ((openflags & O_ACCMODE) == 3)
|
|
openflags--;
|
|
|
|
/* We can't create new files here */
|
|
openflags &= ~(O_CREAT|O_EXCL);
|
|
|
|
parent = dget_parent(dentry);
|
|
dir = d_inode(parent);
|
|
|
|
ctx = alloc_nfs_open_context(file_dentry(filp), filp->f_mode, filp);
|
|
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;
|
|
filemap_write_and_wait(inode->i_mapping);
|
|
}
|
|
|
|
inode = NFS_PROTO(dir)->open_context(dir, ctx, openflags, &attr, NULL);
|
|
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 != d_inode(dentry))
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* Flush all dirty pages, and check for write errors.
|
|
*/
|
|
static int
|
|
nfs4_file_flush(struct file *file, fl_owner_t id)
|
|
{
|
|
struct inode *inode = file_inode(file);
|
|
|
|
dprintk("NFS: flush(%pD2)\n", file);
|
|
|
|
nfs_inc_stats(inode, NFSIOS_VFSFLUSH);
|
|
if ((file->f_mode & FMODE_WRITE) == 0)
|
|
return 0;
|
|
|
|
/*
|
|
* If we're holding a write delegation, then check if we're required
|
|
* to flush the i/o on close. If not, then just start the i/o now.
|
|
*/
|
|
if (!nfs4_delegation_flush_on_close(inode))
|
|
return filemap_fdatawrite(file->f_mapping);
|
|
|
|
/* Flush writes to the server and return any errors */
|
|
return vfs_fsync(file, 0);
|
|
}
|
|
|
|
#ifdef CONFIG_NFS_V4_2
|
|
static ssize_t nfs4_copy_file_range(struct file *file_in, loff_t pos_in,
|
|
struct file *file_out, loff_t pos_out,
|
|
size_t count, unsigned int flags)
|
|
{
|
|
if (file_inode(file_in) == file_inode(file_out))
|
|
return -EINVAL;
|
|
|
|
return nfs42_proc_copy(file_in, pos_in, file_out, pos_out, count);
|
|
}
|
|
|
|
static loff_t nfs4_file_llseek(struct file *filep, loff_t offset, int whence)
|
|
{
|
|
loff_t ret;
|
|
|
|
switch (whence) {
|
|
case SEEK_HOLE:
|
|
case SEEK_DATA:
|
|
ret = nfs42_proc_llseek(filep, offset, whence);
|
|
if (ret != -ENOTSUPP)
|
|
return ret;
|
|
default:
|
|
return nfs_file_llseek(filep, offset, whence);
|
|
}
|
|
}
|
|
|
|
static long nfs42_fallocate(struct file *filep, int mode, loff_t offset, loff_t len)
|
|
{
|
|
struct inode *inode = file_inode(filep);
|
|
long ret;
|
|
|
|
if (!S_ISREG(inode->i_mode))
|
|
return -EOPNOTSUPP;
|
|
|
|
if ((mode != 0) && (mode != (FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE)))
|
|
return -EOPNOTSUPP;
|
|
|
|
ret = inode_newsize_ok(inode, offset + len);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (mode & FALLOC_FL_PUNCH_HOLE)
|
|
return nfs42_proc_deallocate(filep, offset, len);
|
|
return nfs42_proc_allocate(filep, offset, len);
|
|
}
|
|
|
|
static int nfs42_clone_file_range(struct file *src_file, loff_t src_off,
|
|
struct file *dst_file, loff_t dst_off, u64 count)
|
|
{
|
|
struct inode *dst_inode = file_inode(dst_file);
|
|
struct nfs_server *server = NFS_SERVER(dst_inode);
|
|
struct inode *src_inode = file_inode(src_file);
|
|
unsigned int bs = server->clone_blksize;
|
|
bool same_inode = false;
|
|
int ret;
|
|
|
|
/* check alignment w.r.t. clone_blksize */
|
|
ret = -EINVAL;
|
|
if (bs) {
|
|
if (!IS_ALIGNED(src_off, bs) || !IS_ALIGNED(dst_off, bs))
|
|
goto out;
|
|
if (!IS_ALIGNED(count, bs) && i_size_read(src_inode) != (src_off + count))
|
|
goto out;
|
|
}
|
|
|
|
if (src_inode == dst_inode)
|
|
same_inode = true;
|
|
|
|
/* XXX: do we lock at all? what if server needs CB_RECALL_LAYOUT? */
|
|
if (same_inode) {
|
|
inode_lock(src_inode);
|
|
} else if (dst_inode < src_inode) {
|
|
inode_lock_nested(dst_inode, I_MUTEX_PARENT);
|
|
inode_lock_nested(src_inode, I_MUTEX_CHILD);
|
|
} else {
|
|
inode_lock_nested(src_inode, I_MUTEX_PARENT);
|
|
inode_lock_nested(dst_inode, I_MUTEX_CHILD);
|
|
}
|
|
|
|
/* flush all pending writes on both src and dst so that server
|
|
* has the latest data */
|
|
ret = nfs_sync_inode(src_inode);
|
|
if (ret)
|
|
goto out_unlock;
|
|
ret = nfs_sync_inode(dst_inode);
|
|
if (ret)
|
|
goto out_unlock;
|
|
|
|
ret = nfs42_proc_clone(src_file, dst_file, src_off, dst_off, count);
|
|
|
|
/* truncate inode page cache of the dst range so that future reads can fetch
|
|
* new data from server */
|
|
if (!ret)
|
|
truncate_inode_pages_range(&dst_inode->i_data, dst_off, dst_off + count - 1);
|
|
|
|
out_unlock:
|
|
if (same_inode) {
|
|
inode_unlock(src_inode);
|
|
} else if (dst_inode < src_inode) {
|
|
inode_unlock(src_inode);
|
|
inode_unlock(dst_inode);
|
|
} else {
|
|
inode_unlock(dst_inode);
|
|
inode_unlock(src_inode);
|
|
}
|
|
out:
|
|
return ret;
|
|
}
|
|
#endif /* CONFIG_NFS_V4_2 */
|
|
|
|
const struct file_operations nfs4_file_operations = {
|
|
.read_iter = nfs_file_read,
|
|
.write_iter = nfs_file_write,
|
|
.mmap = nfs_file_mmap,
|
|
.open = nfs4_file_open,
|
|
.flush = nfs4_file_flush,
|
|
.release = nfs_file_release,
|
|
.fsync = nfs_file_fsync,
|
|
.lock = nfs_lock,
|
|
.flock = nfs_flock,
|
|
.splice_read = generic_file_splice_read,
|
|
.splice_write = iter_file_splice_write,
|
|
.check_flags = nfs_check_flags,
|
|
.setlease = simple_nosetlease,
|
|
#ifdef CONFIG_NFS_V4_2
|
|
.copy_file_range = nfs4_copy_file_range,
|
|
.llseek = nfs4_file_llseek,
|
|
.fallocate = nfs42_fallocate,
|
|
.clone_file_range = nfs42_clone_file_range,
|
|
#else
|
|
.llseek = nfs_file_llseek,
|
|
#endif
|
|
};
|