This system call takes 3 arguments:
fd - file descriptor of the directory being readahead
*offset - offset in dir from which to resume. This is updated
as we move along in the directory
count - The max number of entries to readahead
The syscall is supposed to read upto 'count' entries starting at
'*offset' and cache the inodes corresponding to those entries. It
returns a negative error code or a positive number indicating
the number of inodes it has issued readaheads for. It also
updates the '*offset' value so that repeated calls to dirreadahead
can resume at the right location. Returns 0 when there are no more
entries left.
Abhi Das (2):
fs: Add dirreadahead syscall and VFS hooks
gfs2: GFS2's implementation of the dir_readahead file operation
arch/x86/syscalls/syscall_32.tbl | 1 +
arch/x86/syscalls/syscall_64.tbl | 1 +
fs/gfs2/Makefile | 3 +-
fs/gfs2/dir.c | 49 ++++++---
fs/gfs2/dir.h | 15 +++
fs/gfs2/dir_readahead.c | 209 +++++++++++++++++++++++++++++++++++++++
fs/gfs2/file.c | 2 +
fs/gfs2/main.c | 10 +-
fs/gfs2/super.c | 1 +
fs/readdir.c | 49 +++++++++
include/linux/fs.h | 3 +
11 files changed, 328 insertions(+), 15 deletions(-)
create mode 100644 fs/gfs2/dir_readahead.c
--
1.8.1.4
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