diff options
| author | Jeff Layton <jlayton@kernel.org> | 2022-02-26 06:33:03 -0500 |
|---|---|---|
| committer | Ilya Dryomov <idryomov@gmail.com> | 2023-08-22 09:01:47 +0200 |
| commit | 03bc06c7b0bd8d86b9f17f459acaeb1283ba2700 (patch) | |
| tree | 4fac68b0dbfa895f1851e00653a8e1a2ca7f217f /fs/ceph/super.c | |
| parent | f628d799972799023d32c2542bb2639eb8c4f84e (diff) | |
ceph: add new mount option to enable sparse reads
Add a new mount option that has the client issue sparse reads instead of
normal ones. The callers now preallocate an sparse extent buffer that
the libceph receive code can populate and hand back after the operation
completes.
After a successful sparse read, we can't use the req->r_result value to
determine the amount of data "read", so instead we set the received
length to be from the end of the last extent in the buffer. Any
interstitial holes will have been filled by the receive code.
[ xiubli: fix a double free on req reported by Ilya ]
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: Xiubo Li <xiubli@redhat.com>
Reviewed-and-tested-by: Luís Henriques <lhenriques@suse.de>
Reviewed-by: Milind Changire <mchangir@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Diffstat (limited to 'fs/ceph/super.c')
| -rw-r--r-- | fs/ceph/super.c | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/fs/ceph/super.c b/fs/ceph/super.c index a5f52013314d..d6a1790f6923 100644 --- a/fs/ceph/super.c +++ b/fs/ceph/super.c @@ -165,6 +165,7 @@ enum { Opt_copyfrom, Opt_wsync, Opt_pagecache, + Opt_sparseread, }; enum ceph_recover_session_mode { @@ -207,6 +208,7 @@ static const struct fs_parameter_spec ceph_mount_parameters[] = { fsparam_u32 ("wsize", Opt_wsize), fsparam_flag_no ("wsync", Opt_wsync), fsparam_flag_no ("pagecache", Opt_pagecache), + fsparam_flag_no ("sparseread", Opt_sparseread), {} }; @@ -576,6 +578,12 @@ static int ceph_parse_mount_param(struct fs_context *fc, else fsopt->flags &= ~CEPH_MOUNT_OPT_NOPAGECACHE; break; + case Opt_sparseread: + if (result.negated) + fsopt->flags &= ~CEPH_MOUNT_OPT_SPARSEREAD; + else + fsopt->flags |= CEPH_MOUNT_OPT_SPARSEREAD; + break; default: BUG(); } @@ -710,9 +718,10 @@ static int ceph_show_options(struct seq_file *m, struct dentry *root) if (!(fsopt->flags & CEPH_MOUNT_OPT_ASYNC_DIROPS)) seq_puts(m, ",wsync"); - if (fsopt->flags & CEPH_MOUNT_OPT_NOPAGECACHE) seq_puts(m, ",nopagecache"); + if (fsopt->flags & CEPH_MOUNT_OPT_SPARSEREAD) + seq_puts(m, ",sparseread"); if (fsopt->wsize != CEPH_MAX_WRITE_SIZE) seq_printf(m, ",wsize=%u", fsopt->wsize); @@ -1296,6 +1305,11 @@ static int ceph_reconfigure_fc(struct fs_context *fc) else ceph_clear_mount_opt(fsc, ASYNC_DIROPS); + if (fsopt->flags & CEPH_MOUNT_OPT_SPARSEREAD) + ceph_set_mount_opt(fsc, SPARSEREAD); + else + ceph_clear_mount_opt(fsc, SPARSEREAD); + if (strcmp_null(fsc->mount_options->mon_addr, fsopt->mon_addr)) { kfree(fsc->mount_options->mon_addr); fsc->mount_options->mon_addr = fsopt->mon_addr; |