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Subject[PATCH v2 2/2] ceph: allow rename operation under different quota realms
Date
Returning -EXDEV when trying to 'mv' files/directories from different
quota realms results in copy+unlink operations instead of the faster
CEPH_MDS_OP_RENAME. This will occur even when there aren't any quotas
set in the destination directory, or if there's enough space left for
the new file(s).

This patch adds a new helper function to be called on rename operations
which will allow these operations if they can be executed. This patch
mimics userland fuse client commit b8954e5734b3 ("client:
optimize rename operation under different quota root").

Since ceph_quota_is_same_realm() is now called only from this new
helper, make it static.

URL: https://tracker.ceph.com/issues/44791
Signed-off-by: Luis Henriques <lhenriques@suse.com>
---
fs/ceph/dir.c | 9 ++++----
fs/ceph/quota.c | 58 ++++++++++++++++++++++++++++++++++++++++++++++++-
fs/ceph/super.h | 3 ++-
3 files changed, 64 insertions(+), 6 deletions(-)

diff --git a/fs/ceph/dir.c b/fs/ceph/dir.c
index d0cd0aba5843..23f0345611a3 100644
--- a/fs/ceph/dir.c
+++ b/fs/ceph/dir.c
@@ -1099,11 +1099,12 @@ static int ceph_rename(struct inode *old_dir, struct dentry *old_dentry,
op = CEPH_MDS_OP_RENAMESNAP;
else
return -EROFS;
+ } else if (old_dir != new_dir) {
+ err = ceph_quota_check_rename(mdsc, d_inode(old_dentry),
+ new_dir);
+ if (err)
+ return err;
}
- /* don't allow cross-quota renames */
- if ((old_dir != new_dir) &&
- (!ceph_quota_is_same_realm(old_dir, new_dir)))
- return -EXDEV;

dout("rename dir %p dentry %p to dir %p dentry %p\n",
old_dir, old_dentry, new_dir, new_dentry);
diff --git a/fs/ceph/quota.c b/fs/ceph/quota.c
index c5c8050f0f99..9e82704a9f7b 100644
--- a/fs/ceph/quota.c
+++ b/fs/ceph/quota.c
@@ -264,7 +264,7 @@ static struct ceph_snap_realm *get_quota_realm(struct ceph_mds_client *mdsc,
return NULL;
}

-bool ceph_quota_is_same_realm(struct inode *old, struct inode *new)
+static bool ceph_quota_is_same_realm(struct inode *old, struct inode *new)
{
struct ceph_mds_client *mdsc = ceph_inode_to_client(old)->mdsc;
struct ceph_snap_realm *old_realm, *new_realm;
@@ -516,3 +516,59 @@ bool ceph_quota_update_statfs(struct ceph_fs_client *fsc, struct kstatfs *buf)
return is_updated;
}

+/*
+ * ceph_quota_check_rename - check if a rename can be executed
+ * @mdsc: MDS client instance
+ * @old: inode to be copied
+ * @new: destination inode (directory)
+ *
+ * This function verifies if a rename (e.g. moving a file or directory) can be
+ * executed. It forces an rstat update in the @new target directory (and in the
+ * source @old as well, if it's a directory). The actual check is done both for
+ * max_files and max_bytes.
+ *
+ * This function returns 0 if it's OK to do the rename, or, if quotas are
+ * exceeded, -EXDEV (if @old is a directory) or -EDQUOT.
+ */
+int ceph_quota_check_rename(struct ceph_mds_client *mdsc,
+ struct inode *old, struct inode *new)
+{
+ struct ceph_inode_info *ci_old = ceph_inode(old);
+ int ret = 0;
+
+ if (ceph_quota_is_same_realm(old, new))
+ return 0;
+
+ /*
+ * Get the latest rstat for target directory (and for source, if a
+ * directory)
+ */
+ ret = ceph_do_getattr(new, CEPH_STAT_RSTAT, false);
+ if (ret)
+ return ret;
+
+ if (S_ISDIR(old->i_mode)) {
+ ret = ceph_do_getattr(old, CEPH_STAT_RSTAT, false);
+ if (ret)
+ return ret;
+ ret = check_quota_exceeded(new, QUOTA_CHECK_MAX_BYTES_OP,
+ ci_old->i_rbytes);
+ if (!ret)
+ ret = check_quota_exceeded(new,
+ QUOTA_CHECK_MAX_FILES_OP,
+ ci_old->i_rfiles +
+ ci_old->i_rsubdirs);
+ if (ret)
+ ret = -EXDEV;
+ } else {
+ ret = check_quota_exceeded(new, QUOTA_CHECK_MAX_BYTES_OP,
+ i_size_read(old));
+ if (!ret)
+ ret = check_quota_exceeded(new,
+ QUOTA_CHECK_MAX_FILES_OP, 1);
+ if (ret)
+ ret = -EDQUOT;
+ }
+
+ return ret;
+}
diff --git a/fs/ceph/super.h b/fs/ceph/super.h
index 037cdfb2ad4f..d5853831a6b5 100644
--- a/fs/ceph/super.h
+++ b/fs/ceph/super.h
@@ -1175,13 +1175,14 @@ extern void ceph_handle_quota(struct ceph_mds_client *mdsc,
struct ceph_mds_session *session,
struct ceph_msg *msg);
extern bool ceph_quota_is_max_files_exceeded(struct inode *inode);
-extern bool ceph_quota_is_same_realm(struct inode *old, struct inode *new);
extern bool ceph_quota_is_max_bytes_exceeded(struct inode *inode,
loff_t newlen);
extern bool ceph_quota_is_max_bytes_approaching(struct inode *inode,
loff_t newlen);
extern bool ceph_quota_update_statfs(struct ceph_fs_client *fsc,
struct kstatfs *buf);
+extern int ceph_quota_check_rename(struct ceph_mds_client *mdsc,
+ struct inode *old, struct inode *new);
extern void ceph_cleanup_quotarealms_inodes(struct ceph_mds_client *mdsc);

#endif /* _FS_CEPH_SUPER_H */
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