[PATCH] inotify
inotify is intended to correct the deficiencies of dnotify, particularly its inability to scale and its terrible user interface: * dnotify requires the opening of one fd per each directory that you intend to watch. This quickly results in too many open files and pins removable media, preventing unmount. * dnotify is directory-based. You only learn about changes to directories. Sure, a change to a file in a directory affects the directory, but you are then forced to keep a cache of stat structures. * dnotify's interface to user-space is awful. Signals? inotify provides a more usable, simple, powerful solution to file change notification: * inotify's interface is a system call that returns a fd, not SIGIO. You get a single fd, which is select()-able. * inotify has an event that says "the filesystem that the item you were watching is on was unmounted." * inotify can watch directories or files. Inotify is currently used by Beagle (a desktop search infrastructure), Gamin (a FAM replacement), and other projects. See Documentation/filesystems/inotify.txt. Signed-off-by: Robert Love <rml@novell.com> Cc: John McCutchan <ttb@tentacle.dhs.org> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
committed by
Linus Torvalds
parent
bd4c625c06
commit
0eeca28300
@ -16,6 +16,7 @@
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#include <linux/security.h>
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#include <linux/syscalls.h>
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#include <linux/module.h>
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#include <linux/fsnotify.h>
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#include <asm/uaccess.h>
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/*
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@ -57,8 +58,10 @@ setxattr(struct dentry *d, char __user *name, void __user *value,
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if (error)
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goto out;
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error = d->d_inode->i_op->setxattr(d, kname, kvalue, size, flags);
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if (!error)
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if (!error) {
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fsnotify_xattr(d);
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security_inode_post_setxattr(d, kname, kvalue, size, flags);
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}
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out:
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up(&d->d_inode->i_sem);
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}
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