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Message-ID: <54C83C54.6020604@huawei.com> Date: Wed, 28 Jan 2015 09:33:08 +0800 From: Zhang Zhen <zhenzhang.zhang@...wei.com> To: Heinrich Schuchardt <xypron.glpk@....de> CC: <linux-fsdevel@...r.kernel.org>, <linux-kernel@...r.kernel.org>, Wang Nan <wangnan0@...wei.com>, <eparis@...isplace.org>, <rlove@...ve.org>, <john@...nmccutchan.com>, Jan Kara <jack@...e.cz>, <morgan.wang@...wei.com> Subject: Re: [RESEND PATCH] inotify: update documentation to reflect code changes On 2015/1/28 5:52, Heinrich Schuchardt wrote: > > Sections (i) and (ii) of Documentation/filesystems/inotify.txt have been > superseded by the inotify.7, inotify_init.2, inotify_rm_watch.2, and > inotify_add_watch.2 man-pages which are more detailed. In sections (i) > and (ii) the inotify_init1 system call is missing. > > Zhang suggests to drop sections (iii) and (iv) as they are obsolete > since 2010. > > Shouldn't we drop the whole file? > Yeah, i agree. Thanks! > Best regards > > Heinrich Schuchardt > > On 27.01.2015 13:45, Zhang Zhen wrote: >> The inotify kernel interface was removed by Eric Paris >> in this commit: 2dfc1ca inotify: remove inotify in >> kernel interface. >> >> Signed-off-by: Zhang Zhen <zhenzhang.zhang@...wei.com> >> --- >> Documentation/filesystems/inotify.txt | 120 +--------------------------------- >> 1 file changed, 2 insertions(+), 118 deletions(-) >> >> diff --git a/Documentation/filesystems/inotify.txt b/Documentation/filesystems/inotify.txt >> index cfd0271..9b74b45 100644 >> --- a/Documentation/filesystems/inotify.txt >> +++ b/Documentation/filesystems/inotify.txt >> @@ -69,123 +69,7 @@ Prototypes: >> int inotify_rm_watch (int fd, __u32 mask); >> >> >> -(iii) Kernel Interface >> - >> -Inotify's kernel API consists a set of functions for managing watches and an >> -event callback. >> - >> -To use the kernel API, you must first initialize an inotify instance with a set >> -of inotify_operations. You are given an opaque inotify_handle, which you use >> -for any further calls to inotify. >> - >> - struct inotify_handle *ih = inotify_init(my_event_handler); >> - >> -You must provide a function for processing events and a function for destroying >> -the inotify watch. >> - >> - void handle_event(struct inotify_watch *watch, u32 wd, u32 mask, >> - u32 cookie, const char *name, struct inode *inode) >> - >> - watch - the pointer to the inotify_watch that triggered this call >> - wd - the watch descriptor >> - mask - describes the event that occurred >> - cookie - an identifier for synchronizing events >> - name - the dentry name for affected files in a directory-based event >> - inode - the affected inode in a directory-based event >> - >> - void destroy_watch(struct inotify_watch *watch) >> - >> -You may add watches by providing a pre-allocated and initialized inotify_watch >> -structure and specifying the inode to watch along with an inotify event mask. >> -You must pin the inode during the call. You will likely wish to embed the >> -inotify_watch structure in a structure of your own which contains other >> -information about the watch. Once you add an inotify watch, it is immediately >> -subject to removal depending on filesystem events. You must grab a reference if >> -you depend on the watch hanging around after the call. >> - >> - inotify_init_watch(&my_watch->iwatch); >> - inotify_get_watch(&my_watch->iwatch); // optional >> - s32 wd = inotify_add_watch(ih, &my_watch->iwatch, inode, mask); >> - inotify_put_watch(&my_watch->iwatch); // optional >> - >> -You may use the watch descriptor (wd) or the address of the inotify_watch for >> -other inotify operations. You must not directly read or manipulate data in the >> -inotify_watch. Additionally, you must not call inotify_add_watch() more than >> -once for a given inotify_watch structure, unless you have first called either >> -inotify_rm_watch() or inotify_rm_wd(). >> - >> -To determine if you have already registered a watch for a given inode, you may >> -call inotify_find_watch(), which gives you both the wd and the watch pointer for >> -the inotify_watch, or an error if the watch does not exist. >> - >> - wd = inotify_find_watch(ih, inode, &watchp); >> - >> -You may use container_of() on the watch pointer to access your own data >> -associated with a given watch. When an existing watch is found, >> -inotify_find_watch() bumps the refcount before releasing its locks. You must >> -put that reference with: >> - >> - put_inotify_watch(watchp); >> - >> -Call inotify_find_update_watch() to update the event mask for an existing watch. >> -inotify_find_update_watch() returns the wd of the updated watch, or an error if >> -the watch does not exist. >> - >> - wd = inotify_find_update_watch(ih, inode, mask); >> - >> -An existing watch may be removed by calling either inotify_rm_watch() or >> -inotify_rm_wd(). >> - >> - int ret = inotify_rm_watch(ih, &my_watch->iwatch); >> - int ret = inotify_rm_wd(ih, wd); >> - >> -A watch may be removed while executing your event handler with the following: >> - >> - inotify_remove_watch_locked(ih, iwatch); >> - >> -Call inotify_destroy() to remove all watches from your inotify instance and >> -release it. If there are no outstanding references, inotify_destroy() will call >> -your destroy_watch op for each watch. >> - >> - inotify_destroy(ih); >> - >> -When inotify removes a watch, it sends an IN_IGNORED event to your callback. >> -You may use this event as an indication to free the watch memory. Note that >> -inotify may remove a watch due to filesystem events, as well as by your request. >> -If you use IN_ONESHOT, inotify will remove the watch after the first event, at >> -which point you may call the final inotify_put_watch. >> - >> -(iv) Kernel Interface Prototypes >> - >> - struct inotify_handle *inotify_init(struct inotify_operations *ops); >> - >> - inotify_init_watch(struct inotify_watch *watch); >> - >> - s32 inotify_add_watch(struct inotify_handle *ih, >> - struct inotify_watch *watch, >> - struct inode *inode, u32 mask); >> - >> - s32 inotify_find_watch(struct inotify_handle *ih, struct inode *inode, >> - struct inotify_watch **watchp); >> - >> - s32 inotify_find_update_watch(struct inotify_handle *ih, >> - struct inode *inode, u32 mask); >> - >> - int inotify_rm_wd(struct inotify_handle *ih, u32 wd); >> - >> - int inotify_rm_watch(struct inotify_handle *ih, >> - struct inotify_watch *watch); >> - >> - void inotify_remove_watch_locked(struct inotify_handle *ih, >> - struct inotify_watch *watch); >> - >> - void inotify_destroy(struct inotify_handle *ih); >> - >> - void get_inotify_watch(struct inotify_watch *watch); >> - void put_inotify_watch(struct inotify_watch *watch); >> - >> - >> -(v) Internal Kernel Implementation >> +(iii) Internal Kernel Implementation >> >> Each inotify instance is represented by an inotify_handle structure. >> Inotify's userspace consumers also have an inotify_device which is >> @@ -198,7 +82,7 @@ See fs/notify/inotify/inotify_fsnotify.c and fs/notify/inotify/inotify_user.c >> for the locking and lifetime rules. >> >> >> -(vi) Rationale >> +(iv) Rationale >> >> Q: What is the design decision behind not tying the watch to the open fd of >> the watched object? >> > > > . > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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