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authorDavid Howells <dhowells@redhat.com>2007-05-09 05:33:46 -0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-05-09 15:30:50 -0400
commit31143d5d515ece617ffccb7df5ff75e4d1dfa120 (patch)
treedb28c26930f6a26db3e85da90f6668061425463a /fs/afs/super.c
parent416351f28d2b31d15ff73e9aff699b2163704c95 (diff)
AFS: implement basic file write support
Implement support for writing to regular AFS files, including: (1) write (2) truncate (3) fsync, fdatasync (4) chmod, chown, chgrp, utime. AFS writeback attempts to batch writes into as chunks as large as it can manage up to the point that it writes back 65535 pages in one chunk or it meets a locked page. Furthermore, if a page has been written to using a particular key, then should another write to that page use some other key, the first write will be flushed before the second is allowed to take place. If the first write fails due to a security error, then the page will be scrapped and reread before the second write takes place. If a page is dirty and the callback on it is broken by the server, then the dirty data is not discarded (same behaviour as NFS). Shared-writable mappings are not supported by this patch. [akpm@linux-foundation.org: fix a bunch of warnings] Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/afs/super.c')
-rw-r--r--fs/afs/super.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/fs/afs/super.c b/fs/afs/super.c
index 7030d76155fc..d24be334b608 100644
--- a/fs/afs/super.c
+++ b/fs/afs/super.c
@@ -50,6 +50,7 @@ static const struct super_operations afs_super_ops = {
50 .statfs = simple_statfs, 50 .statfs = simple_statfs,
51 .alloc_inode = afs_alloc_inode, 51 .alloc_inode = afs_alloc_inode,
52 .drop_inode = generic_delete_inode, 52 .drop_inode = generic_delete_inode,
53 .write_inode = afs_write_inode,
53 .destroy_inode = afs_destroy_inode, 54 .destroy_inode = afs_destroy_inode,
54 .clear_inode = afs_clear_inode, 55 .clear_inode = afs_clear_inode,
55 .umount_begin = afs_umount_begin, 56 .umount_begin = afs_umount_begin,
@@ -66,7 +67,7 @@ enum {
66 afs_opt_vol, 67 afs_opt_vol,
67}; 68};
68 69
69static const match_table_t afs_options_list = { 70static match_table_t afs_options_list = {
70 { afs_opt_cell, "cell=%s" }, 71 { afs_opt_cell, "cell=%s" },
71 { afs_opt_rwpath, "rwpath" }, 72 { afs_opt_rwpath, "rwpath" },
72 { afs_opt_vol, "vol=%s" }, 73 { afs_opt_vol, "vol=%s" },
@@ -459,7 +460,9 @@ static void afs_i_init_once(void *_vnode, struct kmem_cache *cachep,
459 init_waitqueue_head(&vnode->update_waitq); 460 init_waitqueue_head(&vnode->update_waitq);
460 mutex_init(&vnode->permits_lock); 461 mutex_init(&vnode->permits_lock);
461 mutex_init(&vnode->validate_lock); 462 mutex_init(&vnode->validate_lock);
463 spin_lock_init(&vnode->writeback_lock);
462 spin_lock_init(&vnode->lock); 464 spin_lock_init(&vnode->lock);
465 INIT_LIST_HEAD(&vnode->writebacks);
463 INIT_WORK(&vnode->cb_broken_work, afs_broken_callback_work); 466 INIT_WORK(&vnode->cb_broken_work, afs_broken_callback_work);
464 } 467 }
465} 468}