cregit-Linux how code gets into the kernel

Release 4.10 fs/notify/inode_mark.c

Directory: fs/notify
 *  Copyright (C) 2008 Red Hat, Inc., Eric Paris <>
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2, or (at your option)
 *  any later version.
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  GNU General Public License for more details.
 *  You should have received a copy of the GNU General Public License
 *  along with this program; see the file COPYING.  If not, write to
 *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.

#include <linux/fs.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/spinlock.h>

#include <linux/atomic.h>

#include <linux/fsnotify_backend.h>
#include "fsnotify.h"

#include "../internal.h"

 * Recalculate the inode->i_fsnotify_mask, or the mask of all FS_* event types
 * any notifier is interested in hearing for this inode.

void fsnotify_recalc_inode_mask(struct inode *inode) { spin_lock(&inode->i_lock); inode->i_fsnotify_mask = fsnotify_recalc_mask(&inode->i_fsnotify_marks); spin_unlock(&inode->i_lock); __fsnotify_update_child_dentry_flags(inode); }


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void fsnotify_destroy_inode_mark(struct fsnotify_mark *mark) { struct inode *inode = mark->inode; BUG_ON(!mutex_is_locked(&mark->group->mark_mutex)); assert_spin_locked(&mark->lock); spin_lock(&inode->i_lock); hlist_del_init_rcu(&mark->obj_list); mark->inode = NULL; /* * this mark is now off the inode->i_fsnotify_marks list and we * hold the inode->i_lock, so this is the perfect time to update the * inode->i_fsnotify_mask */ inode->i_fsnotify_mask = fsnotify_recalc_mask(&inode->i_fsnotify_marks); spin_unlock(&inode->i_lock); }


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/* * Given a group clear all of the inode marks associated with that group. */
void fsnotify_clear_inode_marks_by_group(struct fsnotify_group *group) { fsnotify_clear_marks_by_group_flags(group, FSNOTIFY_MARK_FLAG_INODE); }


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/* * given a group and inode, find the mark associated with that combination. * if found take a reference to that mark and return it, else return NULL */
struct fsnotify_mark *fsnotify_find_inode_mark(struct fsnotify_group *group, struct inode *inode) { struct fsnotify_mark *mark; spin_lock(&inode->i_lock); mark = fsnotify_find_mark(&inode->i_fsnotify_marks, group); spin_unlock(&inode->i_lock); return mark; }


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eric pariseric paris2241.51%250.00%
jan karajan kara611.32%125.00%

/* * If we are setting a mark mask on an inode mark we should pin the inode * in memory. */
void fsnotify_set_inode_mark_mask_locked(struct fsnotify_mark *mark, __u32 mask) { struct inode *inode; assert_spin_locked(&mark->lock); if (mask && mark->inode && !(mark->flags & FSNOTIFY_MARK_FLAG_OBJECT_PINNED)) { mark->flags |= FSNOTIFY_MARK_FLAG_OBJECT_PINNED; inode = igrab(mark->inode); /* * we shouldn't be able to get here if the inode wasn't * already safely held in memory. But bug in case it * ever is wrong. */ BUG_ON(!inode); } }


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/* * Attach an initialized mark to a given inode. * These marks may be used for the fsnotify backend to determine which * event types should be delivered to which group and for which inodes. These * marks are ordered according to priority, highest number first, and then by * the group's location in memory. */
int fsnotify_add_inode_mark(struct fsnotify_mark *mark, struct fsnotify_group *group, struct inode *inode, int allow_dups) { int ret; mark->flags |= FSNOTIFY_MARK_FLAG_INODE; BUG_ON(!mutex_is_locked(&group->mark_mutex)); assert_spin_locked(&mark->lock); spin_lock(&inode->i_lock); mark->inode = inode; ret = fsnotify_add_mark_list(&inode->i_fsnotify_marks, mark, allow_dups); inode->i_fsnotify_mask = fsnotify_recalc_mask(&inode->i_fsnotify_marks); spin_unlock(&inode->i_lock); return ret; }


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/** * fsnotify_unmount_inodes - an sb is unmounting. handle any watched inodes. * @sb: superblock being unmounted. * * Called during unmount with no locks held, so needs to be safe against * concurrent modifiers. We temporarily drop sb->s_inode_list_lock and CAN block. */
void fsnotify_unmount_inodes(struct super_block *sb) { struct inode *inode, *iput_inode = NULL; spin_lock(&sb->s_inode_list_lock); list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { /* * We cannot __iget() an inode in state I_FREEING, * I_WILL_FREE, or I_NEW which is fine because by that point * the inode cannot have any associated watches. */ spin_lock(&inode->i_lock); if (inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) { spin_unlock(&inode->i_lock); continue; } /* * If i_count is zero, the inode cannot have any watches and * doing an __iget/iput with MS_ACTIVE clear would actually * evict all inodes with zero i_count from icache which is * unnecessarily violent and may in fact be illegal to do. */ if (!atomic_read(&inode->i_count)) { spin_unlock(&inode->i_lock); continue; } __iget(inode); spin_unlock(&inode->i_lock); spin_unlock(&sb->s_inode_list_lock); if (iput_inode) iput(iput_inode); /* for each watch, send FS_UNMOUNT and then remove it */ fsnotify(inode, FS_UNMOUNT, inode, FSNOTIFY_EVENT_INODE, NULL, 0); fsnotify_inode_delete(inode); iput_inode = inode; spin_lock(&sb->s_inode_list_lock); } spin_unlock(&sb->s_inode_list_lock); if (iput_inode) iput(iput_inode); }


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lino sanfilippolino sanfilippo183.11%13.70%
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Directory: fs/notify
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