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Merge tag 'for-6.5/splice-2023-06-23' of git://git.kernel.dk/linux
Pull splice updates from Jens Axboe:
"This kills off ITER_PIPE to avoid a race between truncate,
iov_iter_revert() on the pipe and an as-yet incomplete DMA to a bio
with unpinned/unref'ed pages from an O_DIRECT splice read. This causes
memory corruption.
Instead, we either use (a) filemap_splice_read(), which invokes the
buffered file reading code and splices from the pagecache into the
pipe; (b) copy_splice_read(), which bulk-allocates a buffer, reads
into it and then pushes the filled pages into the pipe; or (c) handle
it in filesystem-specific code.
Summary:
- Rename direct_splice_read() to copy_splice_read()
- Simplify the calculations for the number of pages to be reclaimed
in copy_splice_read()
- Turn do_splice_to() into a helper, vfs_splice_read(), so that it
can be used by overlayfs and coda to perform the checks on the
lower fs
- Make vfs_splice_read() jump to copy_splice_read() to handle
direct-I/O and DAX
- Provide shmem with its own splice_read to handle non-existent pages
in the pagecache. We don't want a ->read_folio() as we don't want
to populate holes, but filemap_get_pages() requires it
- Provide overlayfs with its own splice_read to call down to a lower
layer as overlayfs doesn't provide ->read_folio()
- Provide coda with its own splice_read to call down to a lower layer
as coda doesn't provide ->read_folio()
- Direct ->splice_read to copy_splice_read() in tty, procfs, kernfs
and random files as they just copy to the output buffer and don't
splice pages
- Provide wrappers for afs, ceph, ecryptfs, ext4, f2fs, nfs, ntfs3,
ocfs2, orangefs, xfs and zonefs to do locking and/or revalidation
- Make cifs use filemap_splice_read()
- Replace pointers to generic_file_splice_read() with pointers to
filemap_splice_read() as DIO and DAX are handled in the caller;
filesystems can still provide their own alternate ->splice_read()
op
- Remove generic_file_splice_read()
- Remove ITER_PIPE and its paraphernalia as generic_file_splice_read
was the only user"
* tag 'for-6.5/splice-2023-06-23' of git://git.kernel.dk/linux: (31 commits)
splice: kdoc for filemap_splice_read() and copy_splice_read()
iov_iter: Kill ITER_PIPE
splice: Remove generic_file_splice_read()
splice: Use filemap_splice_read() instead of generic_file_splice_read()
cifs: Use filemap_splice_read()
trace: Convert trace/seq to use copy_splice_read()
zonefs: Provide a splice-read wrapper
xfs: Provide a splice-read wrapper
orangefs: Provide a splice-read wrapper
ocfs2: Provide a splice-read wrapper
ntfs3: Provide a splice-read wrapper
nfs: Provide a splice-read wrapper
f2fs: Provide a splice-read wrapper
ext4: Provide a splice-read wrapper
ecryptfs: Provide a splice-read wrapper
ceph: Provide a splice-read wrapper
afs: Provide a splice-read wrapper
9p: Add splice_read wrapper
net: Make sock_splice_read() use copy_splice_read() by default
tty, proc, kernfs, random: Use copy_splice_read()
...
165 lines
6.6 KiB
C
165 lines
6.6 KiB
C
/* SPDX-License-Identifier: LGPL-2.1 */
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/*
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*
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* Copyright (c) International Business Machines Corp., 2002, 2007
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* Author(s): Steve French (sfrench@us.ibm.com)
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*
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*/
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#ifndef _CIFSFS_H
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#define _CIFSFS_H
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#include <linux/hash.h>
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#define ROOT_I 2
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/*
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* ino_t is 32-bits on 32-bit arch. We have to squash the 64-bit value down
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* so that it will fit. We use hash_64 to convert the value to 31 bits, and
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* then add 1, to ensure that we don't end up with a 0 as the value.
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*/
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static inline ino_t
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cifs_uniqueid_to_ino_t(u64 fileid)
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{
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if ((sizeof(ino_t)) < (sizeof(u64)))
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return (ino_t)hash_64(fileid, (sizeof(ino_t) * 8) - 1) + 1;
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return (ino_t)fileid;
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}
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static inline void cifs_set_time(struct dentry *dentry, unsigned long time)
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{
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dentry->d_fsdata = (void *) time;
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}
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static inline unsigned long cifs_get_time(struct dentry *dentry)
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{
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return (unsigned long) dentry->d_fsdata;
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}
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extern struct file_system_type cifs_fs_type, smb3_fs_type;
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extern const struct address_space_operations cifs_addr_ops;
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extern const struct address_space_operations cifs_addr_ops_smallbuf;
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/* Functions related to super block operations */
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extern void cifs_sb_active(struct super_block *sb);
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extern void cifs_sb_deactive(struct super_block *sb);
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/* Functions related to inodes */
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extern const struct inode_operations cifs_dir_inode_ops;
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extern struct inode *cifs_root_iget(struct super_block *);
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extern int cifs_create(struct mnt_idmap *, struct inode *,
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struct dentry *, umode_t, bool excl);
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extern int cifs_atomic_open(struct inode *, struct dentry *,
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struct file *, unsigned, umode_t);
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extern struct dentry *cifs_lookup(struct inode *, struct dentry *,
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unsigned int);
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extern int cifs_unlink(struct inode *dir, struct dentry *dentry);
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extern int cifs_hardlink(struct dentry *, struct inode *, struct dentry *);
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extern int cifs_mknod(struct mnt_idmap *, struct inode *, struct dentry *,
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umode_t, dev_t);
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extern int cifs_mkdir(struct mnt_idmap *, struct inode *, struct dentry *,
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umode_t);
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extern int cifs_rmdir(struct inode *, struct dentry *);
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extern int cifs_rename2(struct mnt_idmap *, struct inode *,
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struct dentry *, struct inode *, struct dentry *,
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unsigned int);
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extern int cifs_revalidate_file_attr(struct file *filp);
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extern int cifs_revalidate_dentry_attr(struct dentry *);
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extern int cifs_revalidate_file(struct file *filp);
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extern int cifs_revalidate_dentry(struct dentry *);
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extern int cifs_invalidate_mapping(struct inode *inode);
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extern int cifs_revalidate_mapping(struct inode *inode);
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extern int cifs_zap_mapping(struct inode *inode);
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extern int cifs_getattr(struct mnt_idmap *, const struct path *,
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struct kstat *, u32, unsigned int);
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extern int cifs_setattr(struct mnt_idmap *, struct dentry *,
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struct iattr *);
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extern int cifs_fiemap(struct inode *, struct fiemap_extent_info *, u64 start,
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u64 len);
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extern const struct inode_operations cifs_file_inode_ops;
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extern const struct inode_operations cifs_symlink_inode_ops;
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extern const struct inode_operations cifs_dfs_referral_inode_operations;
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/* Functions related to files and directories */
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extern const struct file_operations cifs_file_ops;
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extern const struct file_operations cifs_file_direct_ops; /* if directio mnt */
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extern const struct file_operations cifs_file_strict_ops; /* if strictio mnt */
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extern const struct file_operations cifs_file_nobrl_ops; /* no brlocks */
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extern const struct file_operations cifs_file_direct_nobrl_ops;
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extern const struct file_operations cifs_file_strict_nobrl_ops;
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extern int cifs_open(struct inode *inode, struct file *file);
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extern int cifs_close(struct inode *inode, struct file *file);
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extern int cifs_closedir(struct inode *inode, struct file *file);
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extern ssize_t cifs_user_readv(struct kiocb *iocb, struct iov_iter *to);
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extern ssize_t cifs_direct_readv(struct kiocb *iocb, struct iov_iter *to);
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extern ssize_t cifs_strict_readv(struct kiocb *iocb, struct iov_iter *to);
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extern ssize_t cifs_user_writev(struct kiocb *iocb, struct iov_iter *from);
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extern ssize_t cifs_direct_writev(struct kiocb *iocb, struct iov_iter *from);
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extern ssize_t cifs_strict_writev(struct kiocb *iocb, struct iov_iter *from);
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extern int cifs_flock(struct file *pfile, int cmd, struct file_lock *plock);
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extern int cifs_lock(struct file *, int, struct file_lock *);
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extern int cifs_fsync(struct file *, loff_t, loff_t, int);
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extern int cifs_strict_fsync(struct file *, loff_t, loff_t, int);
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extern int cifs_flush(struct file *, fl_owner_t id);
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extern int cifs_file_mmap(struct file *file, struct vm_area_struct *vma);
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extern int cifs_file_strict_mmap(struct file *file, struct vm_area_struct *vma);
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extern const struct file_operations cifs_dir_ops;
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extern int cifs_dir_open(struct inode *inode, struct file *file);
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extern int cifs_readdir(struct file *file, struct dir_context *ctx);
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extern void cifs_pages_written_back(struct inode *inode, loff_t start, unsigned int len);
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extern void cifs_pages_write_failed(struct inode *inode, loff_t start, unsigned int len);
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extern void cifs_pages_write_redirty(struct inode *inode, loff_t start, unsigned int len);
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/* Functions related to dir entries */
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extern const struct dentry_operations cifs_dentry_ops;
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extern const struct dentry_operations cifs_ci_dentry_ops;
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#ifdef CONFIG_CIFS_DFS_UPCALL
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extern struct vfsmount *cifs_dfs_d_automount(struct path *path);
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#else
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static inline struct vfsmount *cifs_dfs_d_automount(struct path *path)
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{
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return ERR_PTR(-EREMOTE);
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}
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#endif
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/* Functions related to symlinks */
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extern const char *cifs_get_link(struct dentry *, struct inode *,
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struct delayed_call *);
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extern int cifs_symlink(struct mnt_idmap *idmap, struct inode *inode,
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struct dentry *direntry, const char *symname);
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#ifdef CONFIG_CIFS_XATTR
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extern const struct xattr_handler *cifs_xattr_handlers[];
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extern ssize_t cifs_listxattr(struct dentry *, char *, size_t);
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#else
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# define cifs_xattr_handlers NULL
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# define cifs_listxattr NULL
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#endif
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extern ssize_t cifs_file_copychunk_range(unsigned int xid,
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struct file *src_file, loff_t off,
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struct file *dst_file, loff_t destoff,
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size_t len, unsigned int flags);
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extern long cifs_ioctl(struct file *filep, unsigned int cmd, unsigned long arg);
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extern void cifs_setsize(struct inode *inode, loff_t offset);
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extern int cifs_truncate_page(struct address_space *mapping, loff_t from);
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struct smb3_fs_context;
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extern struct dentry *cifs_smb3_do_mount(struct file_system_type *fs_type,
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int flags, struct smb3_fs_context *ctx);
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#ifdef CONFIG_CIFS_NFSD_EXPORT
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extern const struct export_operations cifs_export_ops;
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#endif /* CONFIG_CIFS_NFSD_EXPORT */
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/* when changing internal version - update following two lines at same time */
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#define SMB3_PRODUCT_BUILD 43
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#define CIFS_VERSION "2.43"
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#endif /* _CIFSFS_H */
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