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-rw-r--r--Documentation/filesystems/vfs.txt22
1 files changed, 15 insertions, 7 deletions
diff --git a/Documentation/filesystems/vfs.txt b/Documentation/filesystems/vfs.txt
index a6c6a8af48a2..5f71a252e2e0 100644
--- a/Documentation/filesystems/vfs.txt
+++ b/Documentation/filesystems/vfs.txt
@@ -883,8 +883,9 @@ struct file_operations {
unsigned (*mmap_capabilities)(struct file *);
#endif
ssize_t (*copy_file_range)(struct file *, loff_t, struct file *, loff_t, size_t, unsigned int);
- int (*clone_file_range)(struct file *, loff_t, struct file *, loff_t, u64);
- int (*dedupe_file_range)(struct file *, loff_t, struct file *, loff_t, u64);
+ loff_t (*remap_file_range)(struct file *file_in, loff_t pos_in,
+ struct file *file_out, loff_t pos_out,
+ loff_t len, unsigned int remap_flags);
int (*fadvise)(struct file *, loff_t, loff_t, int);
};
@@ -960,11 +961,18 @@ otherwise noted.
copy_file_range: called by the copy_file_range(2) system call.
- clone_file_range: called by the ioctl(2) system call for FICLONERANGE and
- FICLONE commands.
-
- dedupe_file_range: called by the ioctl(2) system call for FIDEDUPERANGE
- command.
+ remap_file_range: called by the ioctl(2) system call for FICLONERANGE and
+ FICLONE and FIDEDUPERANGE commands to remap file ranges. An
+ implementation should remap len bytes at pos_in of the source file into
+ the dest file at pos_out. Implementations must handle callers passing
+ in len == 0; this means "remap to the end of the source file". The
+ return value should the number of bytes remapped, or the usual
+ negative error code if errors occurred before any bytes were remapped.
+ The remap_flags parameter accepts REMAP_FILE_* flags. If
+ REMAP_FILE_DEDUP is set then the implementation must only remap if the
+ requested file ranges have identical contents. If REMAP_CAN_SHORTEN is
+ set, the caller is ok with the implementation shortening the request
+ length to satisfy alignment or EOF requirements (or any other reason).
fadvise: possibly called by the fadvise64() system call.