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844e5c0eb1
When looking at performance issues around directory caching, or debugging directory lease issues, it is helpful to be able to display the current directory leases (as we can e.g. or open files). Create pseudo-file /proc/fs/cifs/open_dirs that displays current directory leases. Here is sample output: cat /proc/fs/cifs/open_dirs Version:1 Format: <tree id> <sess id> <persistent fid> <path> Num entries: 3 0xce4c1c68 0x7176aa54 0xd95ef58e \dira valid file info, valid dirents 0xce4c1c68 0x7176aa54 0xd031e211 \dir5 valid file info, valid dirents 0xce4c1c68 0x7176aa54 0x96533a90 \dir1 valid file info Reviewed-by: Bharath SM <bharathsm@microsoft.com> Signed-off-by: Steve French <stfrench@microsoft.com>
85 lines
2.3 KiB
C
85 lines
2.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Functions to handle the cached directory entries
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*
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* Copyright (c) 2022, Ronnie Sahlberg <lsahlber@redhat.com>
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*/
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#ifndef _CACHED_DIR_H
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#define _CACHED_DIR_H
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struct cached_dirent {
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struct list_head entry;
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char *name;
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int namelen;
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loff_t pos;
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struct cifs_fattr fattr;
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};
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struct cached_dirents {
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bool is_valid:1;
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bool is_failed:1;
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struct file *file; /*
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* Used to associate the cache with a single
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* open file instance.
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*/
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struct mutex de_mutex;
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loff_t pos; /* Expected ctx->pos */
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struct list_head entries;
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};
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struct cached_fid {
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struct list_head entry;
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struct cached_fids *cfids;
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const char *path;
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bool has_lease:1;
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bool is_open:1;
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bool on_list:1;
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bool file_all_info_is_valid:1;
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unsigned long time; /* jiffies of when lease was taken */
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unsigned long last_access_time; /* jiffies of when last accessed */
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struct kref refcount;
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struct cifs_fid fid;
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spinlock_t fid_lock;
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struct cifs_tcon *tcon;
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struct dentry *dentry;
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struct work_struct put_work;
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struct work_struct close_work;
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struct smb2_file_all_info file_all_info;
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struct cached_dirents dirents;
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};
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/* default MAX_CACHED_FIDS is 16 */
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struct cached_fids {
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/* Must be held when:
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* - accessing the cfids->entries list
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* - accessing the cfids->dying list
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*/
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spinlock_t cfid_list_lock;
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int num_entries;
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struct list_head entries;
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struct list_head dying;
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struct work_struct invalidation_work;
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struct delayed_work laundromat_work;
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};
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extern struct cached_fids *init_cached_dirs(void);
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extern void free_cached_dirs(struct cached_fids *cfids);
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extern int open_cached_dir(unsigned int xid, struct cifs_tcon *tcon,
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const char *path,
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struct cifs_sb_info *cifs_sb,
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bool lookup_only, struct cached_fid **cfid);
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extern int open_cached_dir_by_dentry(struct cifs_tcon *tcon,
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struct dentry *dentry,
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struct cached_fid **cfid);
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extern void close_cached_dir(struct cached_fid *cfid);
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extern void drop_cached_dir_by_name(const unsigned int xid,
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struct cifs_tcon *tcon,
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const char *name,
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struct cifs_sb_info *cifs_sb);
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extern void close_all_cached_dirs(struct cifs_sb_info *cifs_sb);
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extern void invalidate_all_cached_dirs(struct cifs_tcon *tcon);
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extern bool cached_dir_lease_break(struct cifs_tcon *tcon, __u8 lease_key[16]);
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#endif /* _CACHED_DIR_H */
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