diff options
Diffstat (limited to 'Documentation/filesystems/vfs.txt')
| -rw-r--r-- | Documentation/filesystems/vfs.txt | 24 |
1 files changed, 16 insertions, 8 deletions
diff --git a/Documentation/filesystems/vfs.txt b/Documentation/filesystems/vfs.txt index a6c6a8af48a2..8dc8e9c2913f 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. @@ -1123,7 +1131,7 @@ struct dentry_operations { d_manage: called to allow the filesystem to manage the transition from a dentry (optional). This allows autofs, for example, to hold up clients - waiting to explore behind a 'mountpoint' whilst letting the daemon go + waiting to explore behind a 'mountpoint' while letting the daemon go past and construct the subtree there. 0 should be returned to let the calling process continue. -EISDIR can be returned to tell pathwalk to use this directory as an ordinary directory and to ignore anything |