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15a6b982c5
Traditionally, unused dentries would be cached in the dentry cache until the associated entry is no longer on disk. The cached dentry continues to hold an inode reference, causing the inode to be pinned (see previous commit). Here we implement the dentry op d_delete, which is roughly analogous to the drop_inode superblock op, and add a zfs_delete_dentry tunable to control its behaviour. By default it continues the traditional behaviour, but when the tunable is enabled, we signal that an unused dentry should be freed immediately, releasing its inode reference, and so allowing that inode to be deleted if no longer in use. Sponsored-by: Klara, Inc. Sponsored-by: Fastmail Pty Ltd Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Alexander Motin <alexander.motin@TrueNAS.com> Signed-off-by: Rob Norris <rob.norris@klarasystems.com> Closes #17746
187 lines
6.3 KiB
C
187 lines
6.3 KiB
C
// SPDX-License-Identifier: CDDL-1.0
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/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or https://opensource.org/licenses/CDDL-1.0.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright (c) 2011, Lawrence Livermore National Security, LLC.
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*/
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#ifndef _SYS_ZPL_H
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#define _SYS_ZPL_H
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#include <sys/mntent.h>
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#include <sys/vfs.h>
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#include <linux/aio.h>
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#include <linux/dcache_compat.h>
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#include <linux/exportfs.h>
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#include <linux/falloc.h>
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#include <linux/parser.h>
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#include <linux/vfs_compat.h>
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#include <linux/writeback.h>
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#include <linux/xattr_compat.h>
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/* zpl_inode.c */
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extern void zpl_vap_init(vattr_t *vap, struct inode *dir,
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umode_t mode, cred_t *cr, zidmap_t *mnt_ns);
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extern const struct inode_operations zpl_inode_operations;
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extern const struct inode_operations zpl_dir_inode_operations;
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extern const struct inode_operations zpl_symlink_inode_operations;
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extern const struct inode_operations zpl_special_inode_operations;
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/* zpl_file.c */
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extern const struct address_space_operations zpl_address_space_operations;
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extern const struct file_operations zpl_file_operations;
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extern const struct file_operations zpl_dir_file_operations;
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/* zpl_super.c */
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extern void zpl_prune_sb(uint64_t nr_to_scan, void *arg);
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extern const struct super_operations zpl_super_operations;
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extern const struct dentry_operations zpl_dentry_operations;
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extern const struct export_operations zpl_export_operations;
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extern struct file_system_type zpl_fs_type;
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/* zpl_xattr.c */
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extern ssize_t zpl_xattr_list(struct dentry *dentry, char *buf, size_t size);
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extern int zpl_xattr_security_init(struct inode *ip, struct inode *dip,
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const struct qstr *qstr);
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#if defined(CONFIG_FS_POSIX_ACL)
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#if defined(HAVE_SET_ACL_IDMAP_DENTRY)
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extern int zpl_set_acl(struct mnt_idmap *idmap, struct dentry *dentry,
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struct posix_acl *acl, int type);
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#elif defined(HAVE_SET_ACL_USERNS)
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extern int zpl_set_acl(struct user_namespace *userns, struct inode *ip,
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struct posix_acl *acl, int type);
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#elif defined(HAVE_SET_ACL_USERNS_DENTRY_ARG2)
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extern int zpl_set_acl(struct user_namespace *userns, struct dentry *dentry,
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struct posix_acl *acl, int type);
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#else
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extern int zpl_set_acl(struct inode *ip, struct posix_acl *acl, int type);
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#endif /* HAVE_SET_ACL_USERNS */
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#if defined(HAVE_GET_ACL_RCU) || defined(HAVE_GET_INODE_ACL)
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extern struct posix_acl *zpl_get_acl(struct inode *ip, int type, bool rcu);
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#elif defined(HAVE_GET_ACL)
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extern struct posix_acl *zpl_get_acl(struct inode *ip, int type);
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#endif
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extern int zpl_init_acl(struct inode *ip, struct inode *dir);
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extern int zpl_chmod_acl(struct inode *ip);
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#else
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static inline int
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zpl_init_acl(struct inode *ip, struct inode *dir)
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{
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return (0);
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}
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static inline int
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zpl_chmod_acl(struct inode *ip)
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{
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return (0);
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}
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#endif /* CONFIG_FS_POSIX_ACL */
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extern xattr_handler_t *zpl_xattr_handlers[];
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/* zpl_ctldir.c */
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extern const struct file_operations zpl_fops_root;
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extern const struct inode_operations zpl_ops_root;
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extern const struct file_operations zpl_fops_snapdir;
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extern const struct inode_operations zpl_ops_snapdir;
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extern const struct file_operations zpl_fops_shares;
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extern const struct inode_operations zpl_ops_shares;
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/* zpl_file_range.c */
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/* handlers for file_operations of the same name */
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extern ssize_t zpl_copy_file_range(struct file *src_file, loff_t src_off,
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struct file *dst_file, loff_t dst_off, size_t len, unsigned int flags);
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extern loff_t zpl_remap_file_range(struct file *src_file, loff_t src_off,
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struct file *dst_file, loff_t dst_off, loff_t len, unsigned int flags);
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extern int zpl_clone_file_range(struct file *src_file, loff_t src_off,
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struct file *dst_file, loff_t dst_off, uint64_t len);
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extern int zpl_dedupe_file_range(struct file *src_file, loff_t src_off,
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struct file *dst_file, loff_t dst_off, uint64_t len);
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#if defined(HAVE_INODE_TIMESTAMP_TRUNCATE)
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#define zpl_inode_timestamp_truncate(ts, ip) timestamp_truncate(ts, ip)
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#else
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#define zpl_inode_timestamp_truncate(ts, ip) \
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timespec64_trunc(ts, (ip)->i_sb->s_time_gran)
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#endif
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#if defined(HAVE_INODE_OWNER_OR_CAPABLE)
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#define zpl_inode_owner_or_capable(ns, ip) inode_owner_or_capable(ip)
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#elif defined(HAVE_INODE_OWNER_OR_CAPABLE_USERNS)
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#define zpl_inode_owner_or_capable(ns, ip) inode_owner_or_capable(ns, ip)
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#elif defined(HAVE_INODE_OWNER_OR_CAPABLE_IDMAP)
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#define zpl_inode_owner_or_capable(idmap, ip) inode_owner_or_capable(idmap, ip)
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#else
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#error "Unsupported kernel"
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#endif
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#if defined(HAVE_SETATTR_PREPARE_USERNS) || defined(HAVE_SETATTR_PREPARE_IDMAP)
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#define zpl_setattr_prepare(ns, dentry, ia) setattr_prepare(ns, dentry, ia)
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#else
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/*
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* Use kernel-provided version, or our own from
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* linux/vfs_compat.h
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*/
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#define zpl_setattr_prepare(ns, dentry, ia) setattr_prepare(dentry, ia)
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#endif
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#ifdef HAVE_INODE_GET_CTIME
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#define zpl_inode_get_ctime(ip) inode_get_ctime(ip)
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#else
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#define zpl_inode_get_ctime(ip) (ip->i_ctime)
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#endif
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#ifdef HAVE_INODE_SET_CTIME_TO_TS
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#define zpl_inode_set_ctime_to_ts(ip, ts) inode_set_ctime_to_ts(ip, ts)
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#else
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#define zpl_inode_set_ctime_to_ts(ip, ts) (ip->i_ctime = ts)
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#endif
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#ifdef HAVE_INODE_GET_ATIME
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#define zpl_inode_get_atime(ip) inode_get_atime(ip)
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#else
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#define zpl_inode_get_atime(ip) (ip->i_atime)
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#endif
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#ifdef HAVE_INODE_SET_ATIME_TO_TS
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#define zpl_inode_set_atime_to_ts(ip, ts) inode_set_atime_to_ts(ip, ts)
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#else
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#define zpl_inode_set_atime_to_ts(ip, ts) (ip->i_atime = ts)
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#endif
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#ifdef HAVE_INODE_GET_MTIME
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#define zpl_inode_get_mtime(ip) inode_get_mtime(ip)
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#else
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#define zpl_inode_get_mtime(ip) (ip->i_mtime)
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#endif
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#ifdef HAVE_INODE_SET_MTIME_TO_TS
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#define zpl_inode_set_mtime_to_ts(ip, ts) inode_set_mtime_to_ts(ip, ts)
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#else
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#define zpl_inode_set_mtime_to_ts(ip, ts) (ip->i_mtime = ts)
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#endif
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#endif /* _SYS_ZPL_H */
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