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| author | Al Viro <viro@zeniv.linux.org.uk> | 2014-02-11 18:37:41 -0500 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2014-05-06 17:36:00 -0400 |
| commit | 293bc9822fa9b3c9d4b7893bcb241e085580771a (patch) | |
| tree | 89aae8e9d832199906d413dcffd5b885bcee14fe /Documentation/filesystems | |
| parent | 7f7f25e82d54870df24d415a7007fbd327da027b (diff) | |
| download | linux-293bc9822fa9b3c9d4b7893bcb241e085580771a.tar.gz linux-293bc9822fa9b3c9d4b7893bcb241e085580771a.tar.bz2 linux-293bc9822fa9b3c9d4b7893bcb241e085580771a.zip | |
new methods: ->read_iter() and ->write_iter()
Beginning to introduce those. Just the callers for now, and it's
clumsier than it'll eventually become; once we finish converting
aio_read and aio_write instances, the things will get nicer.
For now, these guys are in parallel to ->aio_read() and ->aio_write();
they take iocb and iov_iter, with everything in iov_iter already
validated. File offset is passed in iocb->ki_pos, iov/nr_segs -
in iov_iter.
Main concerns in that series are stack footprint and ability to
split the damn thing cleanly.
[fix from Peter Ujfalusi <peter.ujfalusi@ti.com> folded]
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'Documentation/filesystems')
| -rw-r--r-- | Documentation/filesystems/Locking | 2 | ||||
| -rw-r--r-- | Documentation/filesystems/vfs.txt | 10 |
2 files changed, 10 insertions, 2 deletions
diff --git a/Documentation/filesystems/Locking b/Documentation/filesystems/Locking index 9b0d5a33c8bf..b18dd1779029 100644 --- a/Documentation/filesystems/Locking +++ b/Documentation/filesystems/Locking @@ -430,6 +430,8 @@ prototypes: ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *); ssize_t (*aio_read) (struct kiocb *, const struct iovec *, unsigned long, loff_t); ssize_t (*aio_write) (struct kiocb *, const struct iovec *, unsigned long, loff_t); + ssize_t (*read_iter) (struct kiocb *, struct iov_iter *); + ssize_t (*write_iter) (struct kiocb *, struct iov_iter *); int (*iterate) (struct file *, struct dir_context *); unsigned int (*poll) (struct file *, struct poll_table_struct *); long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long); diff --git a/Documentation/filesystems/vfs.txt b/Documentation/filesystems/vfs.txt index 1846374a5add..a1d0d7a30165 100644 --- a/Documentation/filesystems/vfs.txt +++ b/Documentation/filesystems/vfs.txt @@ -806,6 +806,8 @@ struct file_operations { ssize_t (*write) (struct file *, const char __user *, size_t, loff_t *); ssize_t (*aio_read) (struct kiocb *, const struct iovec *, unsigned long, loff_t); ssize_t (*aio_write) (struct kiocb *, const struct iovec *, unsigned long, loff_t); + ssize_t (*read_iter) (struct kiocb *, struct iov_iter *); + ssize_t (*write_iter) (struct kiocb *, struct iov_iter *); int (*iterate) (struct file *, struct dir_context *); unsigned int (*poll) (struct file *, struct poll_table_struct *); long (*unlocked_ioctl) (struct file *, unsigned int, unsigned long); @@ -836,11 +838,15 @@ otherwise noted. read: called by read(2) and related system calls - aio_read: called by io_submit(2) and other asynchronous I/O operations + aio_read: vectored, possibly asynchronous read + + read_iter: possibly asynchronous read with iov_iter as destination write: called by write(2) and related system calls - aio_write: called by io_submit(2) and other asynchronous I/O operations + aio_write: vectored, possibly asynchronous write + + write_iter: possibly asynchronous write with iov_iter as source iterate: called when the VFS needs to read the directory contents |