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Diffstat (limited to 'fs/stat.c')
-rw-r--r--fs/stat.c65
1 files changed, 52 insertions, 13 deletions
diff --git a/fs/stat.c b/fs/stat.c
index 7c238da22ef0..136711ae72fb 100644
--- a/fs/stat.c
+++ b/fs/stat.c
@@ -27,10 +27,42 @@
#include "mount.h"
/**
+ * fill_mg_cmtime - Fill in the mtime and ctime and flag ctime as QUERIED
+ * @stat: where to store the resulting values
+ * @request_mask: STATX_* values requested
+ * @inode: inode from which to grab the c/mtime
+ *
+ * Given @inode, grab the ctime and mtime out if it and store the result
+ * in @stat. When fetching the value, flag it as queried so the next write
+ * will use a fine-grained timestamp.
+ */
+void fill_mg_cmtime(struct kstat *stat, u32 request_mask, struct inode *inode)
+{
+ atomic_long_t *pnsec = (atomic_long_t *)&inode->__i_ctime.tv_nsec;
+
+ /* If neither time was requested, then don't report them */
+ if (!(request_mask & (STATX_CTIME|STATX_MTIME))) {
+ stat->result_mask &= ~(STATX_CTIME|STATX_MTIME);
+ return;
+ }
+
+ stat->mtime = inode->i_mtime;
+ stat->ctime.tv_sec = inode->__i_ctime.tv_sec;
+ /*
+ * Atomically set the QUERIED flag and fetch the new value with
+ * the flag masked off.
+ */
+ stat->ctime.tv_nsec = atomic_long_fetch_or(I_CTIME_QUERIED, pnsec) &
+ ~I_CTIME_QUERIED;
+}
+EXPORT_SYMBOL(fill_mg_cmtime);
+
+/**
* generic_fillattr - Fill in the basic attributes from the inode struct
- * @idmap: idmap of the mount the inode was found from
- * @inode: Inode to use as the source
- * @stat: Where to fill in the attributes
+ * @idmap: idmap of the mount the inode was found from
+ * @request_mask: statx request_mask
+ * @inode: Inode to use as the source
+ * @stat: Where to fill in the attributes
*
* Fill in the basic attributes in the kstat structure from data that's to be
* found on the VFS inode structure. This is the default if no getattr inode
@@ -42,8 +74,8 @@
* uid and gid filds. On non-idmapped mounts or if permission checking is to be
* performed on the raw inode simply passs @nop_mnt_idmap.
*/
-void generic_fillattr(struct mnt_idmap *idmap, struct inode *inode,
- struct kstat *stat)
+void generic_fillattr(struct mnt_idmap *idmap, u32 request_mask,
+ struct inode *inode, struct kstat *stat)
{
vfsuid_t vfsuid = i_uid_into_vfsuid(idmap, inode);
vfsgid_t vfsgid = i_gid_into_vfsgid(idmap, inode);
@@ -57,10 +89,22 @@ void generic_fillattr(struct mnt_idmap *idmap, struct inode *inode,
stat->rdev = inode->i_rdev;
stat->size = i_size_read(inode);
stat->atime = inode->i_atime;
- stat->mtime = inode->i_mtime;
- stat->ctime = inode->i_ctime;
+
+ if (is_mgtime(inode)) {
+ fill_mg_cmtime(stat, request_mask, inode);
+ } else {
+ stat->mtime = inode->i_mtime;
+ stat->ctime = inode_get_ctime(inode);
+ }
+
stat->blksize = i_blocksize(inode);
stat->blocks = inode->i_blocks;
+
+ if ((request_mask & STATX_CHANGE_COOKIE) && IS_I_VERSION(inode)) {
+ stat->result_mask |= STATX_CHANGE_COOKIE;
+ stat->change_cookie = inode_query_iversion(inode);
+ }
+
}
EXPORT_SYMBOL(generic_fillattr);
@@ -123,17 +167,12 @@ int vfs_getattr_nosec(const struct path *path, struct kstat *stat,
stat->attributes_mask |= (STATX_ATTR_AUTOMOUNT |
STATX_ATTR_DAX);
- if ((request_mask & STATX_CHANGE_COOKIE) && IS_I_VERSION(inode)) {
- stat->result_mask |= STATX_CHANGE_COOKIE;
- stat->change_cookie = inode_query_iversion(inode);
- }
-
idmap = mnt_idmap(path->mnt);
if (inode->i_op->getattr)
return inode->i_op->getattr(idmap, path, stat,
request_mask, query_flags);
- generic_fillattr(idmap, inode, stat);
+ generic_fillattr(idmap, request_mask, inode, stat);
return 0;
}
EXPORT_SYMBOL(vfs_getattr_nosec);