// SPDX-License-Identifier: GPL-2.0-only /* * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. * Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved. */ #define pr_fmt(fmt) … #include <linux/bio.h> #include <linux/sched/signal.h> #include <linux/slab.h> #include <linux/spinlock.h> #include <linux/completion.h> #include <linux/buffer_head.h> #include <linux/statfs.h> #include <linux/seq_file.h> #include <linux/mount.h> #include <linux/kthread.h> #include <linux/delay.h> #include <linux/gfs2_ondisk.h> #include <linux/crc32.h> #include <linux/time.h> #include <linux/wait.h> #include <linux/writeback.h> #include <linux/backing-dev.h> #include <linux/kernel.h> #include "gfs2.h" #include "incore.h" #include "bmap.h" #include "dir.h" #include "glock.h" #include "glops.h" #include "inode.h" #include "log.h" #include "meta_io.h" #include "quota.h" #include "recovery.h" #include "rgrp.h" #include "super.h" #include "trans.h" #include "util.h" #include "sys.h" #include "xattr.h" #include "lops.h" enum dinode_demise { … }; /** * gfs2_jindex_free - Clear all the journal index information * @sdp: The GFS2 superblock * */ void gfs2_jindex_free(struct gfs2_sbd *sdp) { … } static struct gfs2_jdesc *jdesc_find_i(struct list_head *head, unsigned int jid) { … } struct gfs2_jdesc *gfs2_jdesc_find(struct gfs2_sbd *sdp, unsigned int jid) { … } int gfs2_jdesc_check(struct gfs2_jdesc *jd) { … } /** * gfs2_make_fs_rw - Turn a Read-Only FS into a Read-Write one * @sdp: the filesystem * * Returns: errno */ int gfs2_make_fs_rw(struct gfs2_sbd *sdp) { … } void gfs2_statfs_change_in(struct gfs2_statfs_change_host *sc, const void *buf) { … } void gfs2_statfs_change_out(const struct gfs2_statfs_change_host *sc, void *buf) { … } int gfs2_statfs_init(struct gfs2_sbd *sdp) { … } void gfs2_statfs_change(struct gfs2_sbd *sdp, s64 total, s64 free, s64 dinodes) { … } void update_statfs(struct gfs2_sbd *sdp, struct buffer_head *m_bh) { … } int gfs2_statfs_sync(struct super_block *sb, int type) { … } struct lfcc { … }; /** * gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all * journals are clean * @sdp: the file system * * Returns: errno */ static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp) { … } void gfs2_dinode_out(const struct gfs2_inode *ip, void *buf) { … } /** * gfs2_write_inode - Make sure the inode is stable on the disk * @inode: The inode * @wbc: The writeback control structure * * Returns: errno */ static int gfs2_write_inode(struct inode *inode, struct writeback_control *wbc) { … } /** * gfs2_dirty_inode - check for atime updates * @inode: The inode in question * @flags: The type of dirty * * Unfortunately it can be called under any combination of inode * glock and freeze glock, so we have to check carefully. * * At the moment this deals only with atime - it should be possible * to expand that role in future, once a review of the locking has * been carried out. */ static void gfs2_dirty_inode(struct inode *inode, int flags) { … } /** * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one * @sdp: the filesystem * * Returns: errno */ void gfs2_make_fs_ro(struct gfs2_sbd *sdp) { … } /** * gfs2_put_super - Unmount the filesystem * @sb: The VFS superblock * */ static void gfs2_put_super(struct super_block *sb) { … } /** * gfs2_sync_fs - sync the filesystem * @sb: the superblock * @wait: true to wait for completion * * Flushes the log to disk. */ static int gfs2_sync_fs(struct super_block *sb, int wait) { … } static int gfs2_do_thaw(struct gfs2_sbd *sdp) { … } void gfs2_freeze_func(struct work_struct *work) { … } /** * gfs2_freeze_super - prevent further writes to the filesystem * @sb: the VFS structure for the filesystem * */ static int gfs2_freeze_super(struct super_block *sb, enum freeze_holder who) { … } static int gfs2_freeze_fs(struct super_block *sb) { … } /** * gfs2_thaw_super - reallow writes to the filesystem * @sb: the VFS structure for the filesystem * */ static int gfs2_thaw_super(struct super_block *sb, enum freeze_holder who) { … } void gfs2_thaw_freeze_initiator(struct super_block *sb) { … } /** * statfs_slow_fill - fill in the sg for a given RG * @rgd: the RG * @sc: the sc structure * * Returns: 0 on success, -ESTALE if the LVB is invalid */ static int statfs_slow_fill(struct gfs2_rgrpd *rgd, struct gfs2_statfs_change_host *sc) { … } /** * gfs2_statfs_slow - Stat a filesystem using asynchronous locking * @sdp: the filesystem * @sc: the sc info that will be returned * * Any error (other than a signal) will cause this routine to fall back * to the synchronous version. * * FIXME: This really shouldn't busy wait like this. * * Returns: errno */ static int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc) { … } /** * gfs2_statfs_i - Do a statfs * @sdp: the filesystem * @sc: the sc structure * * Returns: errno */ static int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc) { … } /** * gfs2_statfs - Gather and return stats about the filesystem * @dentry: The name of the link * @buf: The buffer * * Returns: 0 on success or error code */ static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf) { … } /** * gfs2_drop_inode - Drop an inode (test for remote unlink) * @inode: The inode to drop * * If we've received a callback on an iopen lock then it's because a * remote node tried to deallocate the inode but failed due to this node * still having the inode open. Here we mark the link count zero * since we know that it must have reached zero if the GLF_DEMOTE flag * is set on the iopen glock. If we didn't do a disk read since the * remote node removed the final link then we might otherwise miss * this event. This check ensures that this node will deallocate the * inode's blocks, or alternatively pass the baton on to another * node for later deallocation. */ static int gfs2_drop_inode(struct inode *inode) { … } /** * gfs2_show_options - Show mount options for /proc/mounts * @s: seq_file structure * @root: root of this (sub)tree * * Returns: 0 on success or error code */ static int gfs2_show_options(struct seq_file *s, struct dentry *root) { … } static void gfs2_final_release_pages(struct gfs2_inode *ip) { … } static int gfs2_dinode_dealloc(struct gfs2_inode *ip) { … } /** * gfs2_glock_put_eventually * @gl: The glock to put * * When under memory pressure, trigger a deferred glock put to make sure we * won't call into DLM and deadlock. Otherwise, put the glock directly. */ static void gfs2_glock_put_eventually(struct gfs2_glock *gl) { … } static bool gfs2_upgrade_iopen_glock(struct inode *inode) { … } /** * evict_should_delete - determine whether the inode is eligible for deletion * @inode: The inode to evict * @gh: The glock holder structure * * This function determines whether the evicted inode is eligible to be deleted * and locks the inode glock. * * Returns: the fate of the dinode */ static enum dinode_demise evict_should_delete(struct inode *inode, struct gfs2_holder *gh) { … } /** * evict_unlinked_inode - delete the pieces of an unlinked evicted inode * @inode: The inode to evict */ static int evict_unlinked_inode(struct inode *inode) { … } /* * evict_linked_inode - evict an inode whose dinode has not been unlinked * @inode: The inode to evict */ static int evict_linked_inode(struct inode *inode) { … } /** * gfs2_evict_inode - Remove an inode from cache * @inode: The inode to evict * * There are three cases to consider: * 1. i_nlink == 0, we are final opener (and must deallocate) * 2. i_nlink == 0, we are not the final opener (and cannot deallocate) * 3. i_nlink > 0 * * If the fs is read only, then we have to treat all cases as per #3 * since we are unable to do any deallocation. The inode will be * deallocated by the next read/write node to attempt an allocation * in the same resource group * * We have to (at the moment) hold the inodes main lock to cover * the gap between unlocking the shared lock on the iopen lock and * taking the exclusive lock. I'd rather do a shared -> exclusive * conversion on the iopen lock, but we can change that later. This * is safe, just less efficient. */ static void gfs2_evict_inode(struct inode *inode) { … } static struct inode *gfs2_alloc_inode(struct super_block *sb) { … } static void gfs2_free_inode(struct inode *inode) { … } void free_local_statfs_inodes(struct gfs2_sbd *sdp) { … } struct inode *find_local_statfs_inode(struct gfs2_sbd *sdp, unsigned int index) { … } const struct super_operations gfs2_super_ops = …;
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