mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-30 17:36:41 +07:00
d8fb02abdc
Lockdep was reporting a possible circular lock dependency in dentry_lease_is_valid(). That function needs to sample the session's s_cap_gen and and s_cap_ttl fields coherently, but needs to do so while holding a dentry lock. The s_cap_lock field was being used to protect the two fields, but that can't be taken while holding a lock on a dentry within the session. In most cases, the s_cap_gen and s_cap_ttl fields only get operated on separately. But in three cases they need to be updated together. Implement a new lock to protect the spots updating both fields atomically is required. Signed-off-by: Alex Elder <elder@dreamhost.com> Reviewed-by: Sage Weil <sage@newdream.net>
384 lines
12 KiB
C
384 lines
12 KiB
C
#ifndef _FS_CEPH_MDS_CLIENT_H
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#define _FS_CEPH_MDS_CLIENT_H
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#include <linux/completion.h>
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#include <linux/kref.h>
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#include <linux/list.h>
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#include <linux/mutex.h>
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#include <linux/rbtree.h>
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#include <linux/spinlock.h>
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#include <linux/ceph/types.h>
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#include <linux/ceph/messenger.h>
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#include <linux/ceph/mdsmap.h>
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/*
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* Some lock dependencies:
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*
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* session->s_mutex
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* mdsc->mutex
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*
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* mdsc->snap_rwsem
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*
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* ci->i_ceph_lock
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* mdsc->snap_flush_lock
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* mdsc->cap_delay_lock
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*
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*/
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struct ceph_fs_client;
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struct ceph_cap;
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/*
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* parsed info about a single inode. pointers are into the encoded
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* on-wire structures within the mds reply message payload.
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*/
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struct ceph_mds_reply_info_in {
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struct ceph_mds_reply_inode *in;
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struct ceph_dir_layout dir_layout;
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u32 symlink_len;
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char *symlink;
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u32 xattr_len;
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char *xattr_data;
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};
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/*
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* parsed info about an mds reply, including information about
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* either: 1) the target inode and/or its parent directory and dentry,
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* and directory contents (for readdir results), or
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* 2) the file range lock info (for fcntl F_GETLK results).
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*/
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struct ceph_mds_reply_info_parsed {
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struct ceph_mds_reply_head *head;
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/* trace */
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struct ceph_mds_reply_info_in diri, targeti;
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struct ceph_mds_reply_dirfrag *dirfrag;
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char *dname;
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u32 dname_len;
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struct ceph_mds_reply_lease *dlease;
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/* extra */
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union {
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/* for fcntl F_GETLK results */
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struct ceph_filelock *filelock_reply;
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/* for readdir results */
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struct {
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struct ceph_mds_reply_dirfrag *dir_dir;
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int dir_nr;
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char **dir_dname;
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u32 *dir_dname_len;
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struct ceph_mds_reply_lease **dir_dlease;
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struct ceph_mds_reply_info_in *dir_in;
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u8 dir_complete, dir_end;
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};
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};
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/* encoded blob describing snapshot contexts for certain
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operations (e.g., open) */
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void *snapblob;
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int snapblob_len;
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};
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/*
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* cap releases are batched and sent to the MDS en masse.
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*/
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#define CEPH_CAPS_PER_RELEASE ((PAGE_CACHE_SIZE - \
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sizeof(struct ceph_mds_cap_release)) / \
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sizeof(struct ceph_mds_cap_item))
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/*
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* state associated with each MDS<->client session
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*/
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enum {
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CEPH_MDS_SESSION_NEW = 1,
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CEPH_MDS_SESSION_OPENING = 2,
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CEPH_MDS_SESSION_OPEN = 3,
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CEPH_MDS_SESSION_HUNG = 4,
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CEPH_MDS_SESSION_CLOSING = 5,
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CEPH_MDS_SESSION_RESTARTING = 6,
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CEPH_MDS_SESSION_RECONNECTING = 7,
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};
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struct ceph_mds_session {
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struct ceph_mds_client *s_mdsc;
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int s_mds;
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int s_state;
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unsigned long s_ttl; /* time until mds kills us */
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u64 s_seq; /* incoming msg seq # */
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struct mutex s_mutex; /* serialize session messages */
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struct ceph_connection s_con;
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struct ceph_authorizer *s_authorizer;
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void *s_authorizer_buf, *s_authorizer_reply_buf;
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size_t s_authorizer_buf_len, s_authorizer_reply_buf_len;
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/* protected by s_gen_ttl_lock */
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spinlock_t s_gen_ttl_lock;
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u32 s_cap_gen; /* inc each time we get mds stale msg */
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unsigned long s_cap_ttl; /* when session caps expire */
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/* protected by s_cap_lock */
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spinlock_t s_cap_lock;
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struct list_head s_caps; /* all caps issued by this session */
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int s_nr_caps, s_trim_caps;
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int s_num_cap_releases;
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struct list_head s_cap_releases; /* waiting cap_release messages */
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struct list_head s_cap_releases_done; /* ready to send */
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struct ceph_cap *s_cap_iterator;
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/* protected by mutex */
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struct list_head s_cap_flushing; /* inodes w/ flushing caps */
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struct list_head s_cap_snaps_flushing;
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unsigned long s_renew_requested; /* last time we sent a renew req */
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u64 s_renew_seq;
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atomic_t s_ref;
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struct list_head s_waiting; /* waiting requests */
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struct list_head s_unsafe; /* unsafe requests */
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};
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/*
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* modes of choosing which MDS to send a request to
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*/
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enum {
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USE_ANY_MDS,
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USE_RANDOM_MDS,
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USE_AUTH_MDS, /* prefer authoritative mds for this metadata item */
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};
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struct ceph_mds_request;
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struct ceph_mds_client;
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/*
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* request completion callback
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*/
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typedef void (*ceph_mds_request_callback_t) (struct ceph_mds_client *mdsc,
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struct ceph_mds_request *req);
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/*
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* an in-flight mds request
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*/
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struct ceph_mds_request {
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u64 r_tid; /* transaction id */
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struct rb_node r_node;
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struct ceph_mds_client *r_mdsc;
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int r_op; /* mds op code */
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/* operation on what? */
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struct inode *r_inode; /* arg1 */
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struct dentry *r_dentry; /* arg1 */
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struct dentry *r_old_dentry; /* arg2: rename from or link from */
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struct inode *r_old_dentry_dir; /* arg2: old dentry's parent dir */
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char *r_path1, *r_path2;
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struct ceph_vino r_ino1, r_ino2;
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struct inode *r_locked_dir; /* dir (if any) i_mutex locked by vfs */
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struct inode *r_target_inode; /* resulting inode */
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struct mutex r_fill_mutex;
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union ceph_mds_request_args r_args;
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int r_fmode; /* file mode, if expecting cap */
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uid_t r_uid;
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gid_t r_gid;
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/* for choosing which mds to send this request to */
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int r_direct_mode;
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u32 r_direct_hash; /* choose dir frag based on this dentry hash */
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bool r_direct_is_hash; /* true if r_direct_hash is valid */
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/* data payload is used for xattr ops */
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struct page **r_pages;
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int r_num_pages;
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int r_data_len;
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/* what caps shall we drop? */
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int r_inode_drop, r_inode_unless;
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int r_dentry_drop, r_dentry_unless;
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int r_old_dentry_drop, r_old_dentry_unless;
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struct inode *r_old_inode;
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int r_old_inode_drop, r_old_inode_unless;
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struct ceph_msg *r_request; /* original request */
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int r_request_release_offset;
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struct ceph_msg *r_reply;
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struct ceph_mds_reply_info_parsed r_reply_info;
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int r_err;
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bool r_aborted;
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unsigned long r_timeout; /* optional. jiffies */
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unsigned long r_started; /* start time to measure timeout against */
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unsigned long r_request_started; /* start time for mds request only,
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used to measure lease durations */
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/* link unsafe requests to parent directory, for fsync */
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struct inode *r_unsafe_dir;
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struct list_head r_unsafe_dir_item;
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struct ceph_mds_session *r_session;
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int r_attempts; /* resend attempts */
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int r_num_fwd; /* number of forward attempts */
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int r_resend_mds; /* mds to resend to next, if any*/
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u32 r_sent_on_mseq; /* cap mseq request was sent at*/
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struct kref r_kref;
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struct list_head r_wait;
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struct completion r_completion;
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struct completion r_safe_completion;
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ceph_mds_request_callback_t r_callback;
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struct list_head r_unsafe_item; /* per-session unsafe list item */
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bool r_got_unsafe, r_got_safe, r_got_result;
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bool r_did_prepopulate;
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u32 r_readdir_offset;
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struct ceph_cap_reservation r_caps_reservation;
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int r_num_caps;
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};
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/*
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* mds client state
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*/
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struct ceph_mds_client {
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struct ceph_fs_client *fsc;
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struct mutex mutex; /* all nested structures */
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struct ceph_mdsmap *mdsmap;
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struct completion safe_umount_waiters;
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wait_queue_head_t session_close_wq;
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struct list_head waiting_for_map;
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struct ceph_mds_session **sessions; /* NULL for mds if no session */
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int max_sessions; /* len of s_mds_sessions */
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int stopping; /* true if shutting down */
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/*
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* snap_rwsem will cover cap linkage into snaprealms, and
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* realm snap contexts. (later, we can do per-realm snap
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* contexts locks..) the empty list contains realms with no
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* references (implying they contain no inodes with caps) that
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* should be destroyed.
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*/
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struct rw_semaphore snap_rwsem;
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struct rb_root snap_realms;
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struct list_head snap_empty;
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spinlock_t snap_empty_lock; /* protect snap_empty */
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u64 last_tid; /* most recent mds request */
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struct rb_root request_tree; /* pending mds requests */
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struct delayed_work delayed_work; /* delayed work */
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unsigned long last_renew_caps; /* last time we renewed our caps */
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struct list_head cap_delay_list; /* caps with delayed release */
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spinlock_t cap_delay_lock; /* protects cap_delay_list */
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struct list_head snap_flush_list; /* cap_snaps ready to flush */
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spinlock_t snap_flush_lock;
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u64 cap_flush_seq;
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struct list_head cap_dirty; /* inodes with dirty caps */
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struct list_head cap_dirty_migrating; /* ...that are migration... */
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int num_cap_flushing; /* # caps we are flushing */
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spinlock_t cap_dirty_lock; /* protects above items */
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wait_queue_head_t cap_flushing_wq;
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/*
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* Cap reservations
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*
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* Maintain a global pool of preallocated struct ceph_caps, referenced
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* by struct ceph_caps_reservations. This ensures that we preallocate
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* memory needed to successfully process an MDS response. (If an MDS
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* sends us cap information and we fail to process it, we will have
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* problems due to the client and MDS being out of sync.)
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*
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* Reservations are 'owned' by a ceph_cap_reservation context.
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*/
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spinlock_t caps_list_lock;
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struct list_head caps_list; /* unused (reserved or
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unreserved) */
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int caps_total_count; /* total caps allocated */
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int caps_use_count; /* in use */
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int caps_reserve_count; /* unused, reserved */
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int caps_avail_count; /* unused, unreserved */
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int caps_min_count; /* keep at least this many
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(unreserved) */
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spinlock_t dentry_lru_lock;
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struct list_head dentry_lru;
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int num_dentry;
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};
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extern const char *ceph_mds_op_name(int op);
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extern struct ceph_mds_session *
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__ceph_lookup_mds_session(struct ceph_mds_client *, int mds);
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static inline struct ceph_mds_session *
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ceph_get_mds_session(struct ceph_mds_session *s)
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{
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atomic_inc(&s->s_ref);
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return s;
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}
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extern void ceph_put_mds_session(struct ceph_mds_session *s);
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extern int ceph_send_msg_mds(struct ceph_mds_client *mdsc,
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struct ceph_msg *msg, int mds);
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extern int ceph_mdsc_init(struct ceph_fs_client *fsc);
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extern void ceph_mdsc_close_sessions(struct ceph_mds_client *mdsc);
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extern void ceph_mdsc_destroy(struct ceph_fs_client *fsc);
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extern void ceph_mdsc_sync(struct ceph_mds_client *mdsc);
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extern void ceph_mdsc_lease_release(struct ceph_mds_client *mdsc,
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struct inode *inode,
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struct dentry *dn);
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extern void ceph_invalidate_dir_request(struct ceph_mds_request *req);
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extern struct ceph_mds_request *
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ceph_mdsc_create_request(struct ceph_mds_client *mdsc, int op, int mode);
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extern void ceph_mdsc_submit_request(struct ceph_mds_client *mdsc,
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struct ceph_mds_request *req);
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extern int ceph_mdsc_do_request(struct ceph_mds_client *mdsc,
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struct inode *dir,
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struct ceph_mds_request *req);
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static inline void ceph_mdsc_get_request(struct ceph_mds_request *req)
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{
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kref_get(&req->r_kref);
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}
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extern void ceph_mdsc_release_request(struct kref *kref);
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static inline void ceph_mdsc_put_request(struct ceph_mds_request *req)
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{
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kref_put(&req->r_kref, ceph_mdsc_release_request);
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}
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extern int ceph_add_cap_releases(struct ceph_mds_client *mdsc,
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struct ceph_mds_session *session);
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extern void ceph_send_cap_releases(struct ceph_mds_client *mdsc,
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struct ceph_mds_session *session);
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extern void ceph_mdsc_pre_umount(struct ceph_mds_client *mdsc);
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extern char *ceph_mdsc_build_path(struct dentry *dentry, int *plen, u64 *base,
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int stop_on_nosnap);
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extern void __ceph_mdsc_drop_dentry_lease(struct dentry *dentry);
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extern void ceph_mdsc_lease_send_msg(struct ceph_mds_session *session,
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struct inode *inode,
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struct dentry *dentry, char action,
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u32 seq);
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extern void ceph_mdsc_handle_map(struct ceph_mds_client *mdsc,
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struct ceph_msg *msg);
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extern void ceph_mdsc_open_export_target_sessions(struct ceph_mds_client *mdsc,
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struct ceph_mds_session *session);
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#endif
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