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| author | Jeff Layton <jlayton@kernel.org> | 2022-09-09 15:00:31 +0200 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2022-10-03 23:03:06 +0200 |
| commit | 36f05cab0a2c97bda288c3b6a557ec5fb8d9bba6 (patch) | |
| tree | 5822bc43904c43dbce00d7dfe1aab83dd02e6633 /fs/posix_acl.c | |
| parent | mm/damon/vaddr: add a comment for 'default' case in damon_va_apply_scheme() (diff) | |
| download | linux-36f05cab0a2c97bda288c3b6a557ec5fb8d9bba6.tar.xz linux-36f05cab0a2c97bda288c3b6a557ec5fb8d9bba6.zip | |
tmpfs: add support for an i_version counter
NFSv4 mandates a change attribute to avoid problems with timestamp
granularity, which Linux implements using the i_version counter. This is
particularly important when the underlying filesystem is fast.
Give tmpfs an i_version counter. Since it doesn't have to be persistent,
we can just turn on SB_I_VERSION and sprinkle some inode_inc_iversion
calls in the right places.
Also, while there is no formal spec for xattrs, most implementations
update the ctime on setxattr. Fix shmem_xattr_handler_set to update the
ctime and bump the i_version appropriately.
Link: https://lkml.kernel.org/r/20220909130031.15477-1-jlayton@kernel.org
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Cc: Chuck Lever <chuck.lever@oracle.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'fs/posix_acl.c')
| -rw-r--r-- | fs/posix_acl.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/posix_acl.c b/fs/posix_acl.c index 5af33800743e..efb88a5e59f9 100644 --- a/fs/posix_acl.c +++ b/fs/posix_acl.c @@ -24,6 +24,7 @@ #include <linux/user_namespace.h> #include <linux/namei.h> #include <linux/mnt_idmapping.h> +#include <linux/iversion.h> static struct posix_acl **acl_by_type(struct inode *inode, int type) { @@ -1073,6 +1074,8 @@ int simple_set_acl(struct user_namespace *mnt_userns, struct inode *inode, } inode->i_ctime = current_time(inode); + if (IS_I_VERSION(inode)) + inode_inc_iversion(inode); set_cached_acl(inode, type, acl); return 0; } |