diff options
author | Robert Love <rml@novell.com> | 2005-07-12 17:06:03 -0400 |
---|---|---|
committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-07-12 20:38:38 -0700 |
commit | 0eeca28300df110bd6ed54b31193c83b87921443 (patch) | |
tree | 7db42d8a18d80eca538f5b7d25e0532b8fa38b85 /fs/attr.c | |
parent | bd4c625c061c2a38568d0add3478f59172455159 (diff) | |
download | kernel_samsung_tuna-0eeca28300df110bd6ed54b31193c83b87921443.zip kernel_samsung_tuna-0eeca28300df110bd6ed54b31193c83b87921443.tar.gz kernel_samsung_tuna-0eeca28300df110bd6ed54b31193c83b87921443.tar.bz2 |
[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>
Diffstat (limited to 'fs/attr.c')
-rw-r--r-- | fs/attr.c | 33 |
1 files changed, 4 insertions, 29 deletions
@@ -10,7 +10,7 @@ #include <linux/mm.h> #include <linux/string.h> #include <linux/smp_lock.h> -#include <linux/dnotify.h> +#include <linux/fsnotify.h> #include <linux/fcntl.h> #include <linux/quotaops.h> #include <linux/security.h> @@ -107,31 +107,8 @@ int inode_setattr(struct inode * inode, struct iattr * attr) out: return error; } - EXPORT_SYMBOL(inode_setattr); -int setattr_mask(unsigned int ia_valid) -{ - unsigned long dn_mask = 0; - - if (ia_valid & ATTR_UID) - dn_mask |= DN_ATTRIB; - if (ia_valid & ATTR_GID) - dn_mask |= DN_ATTRIB; - if (ia_valid & ATTR_SIZE) - dn_mask |= DN_MODIFY; - /* both times implies a utime(s) call */ - if ((ia_valid & (ATTR_ATIME|ATTR_MTIME)) == (ATTR_ATIME|ATTR_MTIME)) - dn_mask |= DN_ATTRIB; - else if (ia_valid & ATTR_ATIME) - dn_mask |= DN_ACCESS; - else if (ia_valid & ATTR_MTIME) - dn_mask |= DN_MODIFY; - if (ia_valid & ATTR_MODE) - dn_mask |= DN_ATTRIB; - return dn_mask; -} - int notify_change(struct dentry * dentry, struct iattr * attr) { struct inode *inode = dentry->d_inode; @@ -197,11 +174,9 @@ int notify_change(struct dentry * dentry, struct iattr * attr) if (ia_valid & ATTR_SIZE) up_write(&dentry->d_inode->i_alloc_sem); - if (!error) { - unsigned long dn_mask = setattr_mask(ia_valid); - if (dn_mask) - dnotify_parent(dentry, dn_mask); - } + if (!error) + fsnotify_change(dentry, ia_valid); + return error; } |