6.11-stable review patch. If anyone has any objections, please let me know.
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From: Trond Myklebust trond.myklebust@hammerspace.com
[ Upstream commit 40f45ab3814f2aff1ddada629c910aad982fc8e1 ]
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: e12912d94137 ("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 Signed-off-by: Sasha Levin sashal@kernel.org --- fs/nfs/inode.c | 49 +++++++++++++++++++++++++++++++------------------ 1 file changed, 31 insertions(+), 18 deletions(-)
diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c index b4914a11c3c25..b6519f4b12663 100644 --- a/fs/nfs/inode.c +++ b/fs/nfs/inode.c @@ -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 */