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| author | Christoph Hellwig <hch@lst.de> | 2015-12-03 12:59:50 +0100 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2015-12-07 23:11:33 -0500 |
| commit | 04b38d601239b4d9be641b412cf4b7456a041c67 (patch) | |
| tree | 196b5fa72848de2a98e09af86099d99da70f2833 /fs/cifs/cifsfs.h | |
| parent | acc15575e78e534c12549d8057a692f490a50f61 (diff) | |
| download | op-kernel-dev-04b38d601239b4d9be641b412cf4b7456a041c67.zip op-kernel-dev-04b38d601239b4d9be641b412cf4b7456a041c67.tar.gz | |
vfs: pull btrfs clone API to vfs layer
The btrfs clone ioctls are now adopted by other file systems, with NFS
and CIFS already having support for them, and XFS being under active
development. To avoid growth of various slightly incompatible
implementations, add one to the VFS. Note that clones are different from
file copies in several ways:
- they are atomic vs other writers
- they support whole file clones
- they support 64-bit legth clones
- they do not allow partial success (aka short writes)
- clones are expected to be a fast metadata operation
Because of that it would be rather cumbersome to try to piggyback them on
top of the recent clone_file_range infrastructure. The converse isn't
true and the clone_file_range system call could try clone file range as
a first attempt to copy, something that further patches will enable.
Based on earlier work from Peng Tao.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/cifs/cifsfs.h')
| -rw-r--r-- | fs/cifs/cifsfs.h | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/fs/cifs/cifsfs.h b/fs/cifs/cifsfs.h index c3cc160..c399513 100644 --- a/fs/cifs/cifsfs.h +++ b/fs/cifs/cifsfs.h @@ -131,7 +131,6 @@ extern int cifs_setxattr(struct dentry *, const char *, const void *, extern ssize_t cifs_getxattr(struct dentry *, const char *, void *, size_t); extern ssize_t cifs_listxattr(struct dentry *, char *, size_t); extern long cifs_ioctl(struct file *filep, unsigned int cmd, unsigned long arg); - #ifdef CONFIG_CIFS_NFSD_EXPORT extern const struct export_operations cifs_export_ops; #endif /* CONFIG_CIFS_NFSD_EXPORT */ |
