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authorLuis Chamberlain <mcgrof@kernel.org>2023-03-10 02:05:45 +0300
committerAndrew Morton <akpm@linux-foundation.org>2023-03-29 02:20:15 +0300
commit2c6efe9cf2d7841b75fe38ed1adbd41a90f51ba0 (patch)
tree6b649bab7e8913980c89b34292998920be7f78c5 /include/linux/shmem_fs.h
parentd0f5a85442d1a0552eae681b2e8cdc86ac08aba2 (diff)
downloadlinux-2c6efe9cf2d7841b75fe38ed1adbd41a90f51ba0.tar.xz
shmem: add support to ignore swap
In doing experimentations with shmem having the option to avoid swap becomes a useful mechanism. One of the *raves* about brd over shmem is you can avoid swap, but that's not really a good reason to use brd if we can instead use shmem. Using brd has its own good reasons to exist, but just because "tmpfs" doesn't let you do that is not a great reason to avoid it if we can easily add support for it. I don't add support for reconfiguring incompatible options, but if we really wanted to we can add support for that. To avoid swap we use mapping_set_unevictable() upon inode creation, and put a WARN_ON_ONCE() stop-gap on writepages() for reclaim. Link: https://lkml.kernel.org/r/20230309230545.2930737-7-mcgrof@kernel.org Signed-off-by: Luis Chamberlain <mcgrof@kernel.org> Acked-by: Christian Brauner <brauner@kernel.org> Tested-by: Xin Hao <xhao@linux.alibaba.com> Reviewed-by: Davidlohr Bueso <dave@stgolabs.net> Cc: Adam Manzanares <a.manzanares@samsung.com> Cc: David Hildenbrand <david@redhat.com> Cc: Davidlohr Bueso <dave@stgolabs.net> Cc: Hugh Dickins <hughd@google.com> Cc: Kees Cook <keescook@chromium.org> Cc: Matthew Wilcox <willy@infradead.org> Cc: Pankaj Raghav <p.raghav@samsung.com> Cc: Yosry Ahmed <yosryahmed@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'include/linux/shmem_fs.h')
-rw-r--r--include/linux/shmem_fs.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/shmem_fs.h b/include/linux/shmem_fs.h
index 103d1000a5a2..50bf82b36995 100644
--- a/include/linux/shmem_fs.h
+++ b/include/linux/shmem_fs.h
@@ -45,6 +45,7 @@ struct shmem_sb_info {
kuid_t uid; /* Mount uid for root directory */
kgid_t gid; /* Mount gid for root directory */
bool full_inums; /* If i_ino should be uint or ino_t */
+ bool noswap; /* ignores VM reclaim / swap requests */
ino_t next_ino; /* The next per-sb inode number to use */
ino_t __percpu *ino_batch; /* The next per-cpu inode number to use */
struct mempolicy *mpol; /* default memory policy for mappings */