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[76.182.20.124]) by smtp.gmail.com with ESMTPSA id d75a77b69052e-462ff580e2asm66683971cf.67.2024.11.11.12.19.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 11 Nov 2024 12:19:26 -0800 (PST) From: Josef Bacik To: kernel-team@fb.com, linux-fsdevel@vger.kernel.org, jack@suse.cz, amir73il@gmail.com, brauner@kernel.org, torvalds@linux-foundation.org, linux-xfs@vger.kernel.org, linux-btrfs@vger.kernel.org, linux-mm@kvack.org, linux-ext4@vger.kernel.org Subject: [PATCH v6 11/17] fanotify: add a helper to check for pre content events Date: Mon, 11 Nov 2024 15:18:00 -0500 Message-ID: <0b76f68806fefceae2618e5f135765e429b23025.1731355931.git.josef@toxicpanda.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-btrfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 We want to emit events during page fault, and calling into fanotify could be expensive, so add a helper to allow us to skip calling into fanotify from page fault. This will also be used to disable readahead for content watched files which will be handled in a subsequent patch. Reviewed-by: Christian Brauner Signed-off-by: Josef Bacik --- fs/notify/fsnotify.c | 16 ++++++++++++++++ include/linux/fsnotify_backend.h | 14 ++++++++++++++ 2 files changed, 30 insertions(+) diff --git a/fs/notify/fsnotify.c b/fs/notify/fsnotify.c index 0696c1771b2a..a49c42c6ce01 100644 --- a/fs/notify/fsnotify.c +++ b/fs/notify/fsnotify.c @@ -203,6 +203,22 @@ static inline bool fsnotify_object_watched(struct inode *inode, __u32 mnt_mask, return mask & marks_mask & ALL_FSNOTIFY_EVENTS; } +#ifdef CONFIG_FANOTIFY_ACCESS_PERMISSIONS +bool fsnotify_file_has_pre_content_watches(struct file *file) +{ + struct inode *inode = file_inode(file); + __u32 mnt_mask = real_mount(file->f_path.mnt)->mnt_fsnotify_mask; + + if (!(inode->i_sb->s_iflags & SB_I_ALLOW_HSM)) + return false; + + return fsnotify_object_watched(inode, mnt_mask, + FSNOTIFY_PRE_CONTENT_EVENTS); +} +EXPORT_SYMBOL_GPL(fsnotify_file_has_pre_content_watches); +#endif + + /* * Notify this dentry's parent about a child's events with child name info * if parent is watching or if inode/sb/mount are interested in events with diff --git a/include/linux/fsnotify_backend.h b/include/linux/fsnotify_backend.h index abd292edb48c..e3a4a8e06fa0 100644 --- a/include/linux/fsnotify_backend.h +++ b/include/linux/fsnotify_backend.h @@ -896,6 +896,15 @@ static inline void fsnotify_init_event(struct fsnotify_event *event) INIT_LIST_HEAD(&event->list); } +#ifdef CONFIG_FANOTIFY_ACCESS_PERMISSIONS +bool fsnotify_file_has_pre_content_watches(struct file *file); +#else +static inline bool fsnotify_file_has_pre_content_watches(struct file *file) +{ + return false; +} +#endif /* CONFIG_FANOTIFY_ACCESS_PERMISSIONS */ + #else static inline int fsnotify(__u32 mask, const void *data, int data_type, @@ -934,6 +943,11 @@ static inline u32 fsnotify_get_cookie(void) static inline void fsnotify_unmount_inodes(struct super_block *sb) {} +static inline bool fsnotify_file_has_pre_content_watches(struct file *file) +{ + return false; +} + #endif /* CONFIG_FSNOTIFY */ #endif /* __KERNEL __ */