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NFS: Further fixes to attribute delegation a/mtime changes

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When asked to set both an atime and an mtime to the current system time,
ensure that the setting is atomic by calling inode_update_timestamps()
only once with the appropriate flags.

Fixes: e12912d941 ("NFSv4: Add support for delegated atime and mtime attributes")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Anna Schumaker <anna.schumaker@oracle.com>
This commit is contained in:
Trond Myklebust 2024-10-23 17:05:48 -04:00 committed by Anna Schumaker
parent d054c5eb28
commit 40f45ab381
1 changed files with 31 additions and 18 deletions
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49
fs/nfs/inode.c
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@ -628,23 +628,35 @@ nfs_fattr_fixup_delegated(struct inode *inode, struct nfs_fattr *fattr)
}
}
static void nfs_update_timestamps(struct inode *inode, unsigned int ia_valid)
{
enum file_time_flags time_flags = 0;
unsigned int cache_flags = 0;
if (ia_valid & ATTR_MTIME) {
time_flags |= S_MTIME | S_CTIME;
cache_flags |= NFS_INO_INVALID_CTIME | NFS_INO_INVALID_MTIME;
}
if (ia_valid & ATTR_ATIME) {
time_flags |= S_ATIME;
cache_flags |= NFS_INO_INVALID_ATIME;
}
inode_update_timestamps(inode, time_flags);
NFS_I(inode)->cache_validity &= ~cache_flags;
}
void nfs_update_delegated_atime(struct inode *inode)
{
spin_lock(&inode->i_lock);
if (nfs_have_delegated_atime(inode)) {
inode_update_timestamps(inode, S_ATIME);
NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ATIME;
}
if (nfs_have_delegated_atime(inode))
nfs_update_timestamps(inode, ATTR_ATIME);
spin_unlock(&inode->i_lock);
}
void nfs_update_delegated_mtime_locked(struct inode *inode)
{
if (nfs_have_delegated_mtime(inode)) {
inode_update_timestamps(inode, S_CTIME | S_MTIME);
NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_CTIME |
NFS_INO_INVALID_MTIME);
}
if (nfs_have_delegated_mtime(inode))
nfs_update_timestamps(inode, ATTR_MTIME);
}
void nfs_update_delegated_mtime(struct inode *inode)
@ -682,15 +694,16 @@ nfs_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
attr->ia_valid &= ~ATTR_SIZE;
}
if (nfs_have_delegated_mtime(inode)) {
if (attr->ia_valid & ATTR_MTIME) {
nfs_update_delegated_mtime(inode);
attr->ia_valid &= ~ATTR_MTIME;
}
if (attr->ia_valid & ATTR_ATIME) {
nfs_update_delegated_atime(inode);
attr->ia_valid &= ~ATTR_ATIME;
}
if (nfs_have_delegated_mtime(inode) && attr->ia_valid & ATTR_MTIME) {
spin_lock(&inode->i_lock);
nfs_update_timestamps(inode, attr->ia_valid);
spin_unlock(&inode->i_lock);
attr->ia_valid &= ~(ATTR_MTIME | ATTR_ATIME);
} else if (nfs_have_delegated_atime(inode) &&
attr->ia_valid & ATTR_ATIME &&
!(attr->ia_valid & ATTR_MTIME)) {
nfs_update_delegated_atime(inode);
attr->ia_valid &= ~ATTR_ATIME;
}
/* Optimization: if the end result is no change, don't RPC */