Lachlan McIlroy ba87ea699e [XFS] Fix to prevent the notorious 'NULL files' problem after a crash. ... The problem that has been addressed is that of synchronising updates of the file size with writes that extend a file. Without the fix the update of a file's size, as a result of a write beyond eof, is independent of when the cached data is flushed to disk. Often the file size update would be written to the filesystem log before the data is flushed to disk. When a system crashes between these two events and the filesystem log is replayed on mount the file's size will be set but since the contents never made it to disk the file is full of holes. If some of the cached data was flushed to disk then it may just be a section of the file at the end that has holes. There are existing fixes to help alleviate this problem, particularly in the case where a file has been truncated, that force cached data to be flushed to disk when the file is closed. If the system crashes while the file(s) are still open then this flushing will never occur. The fix that we have implemented is to introduce a second file size, called the in-memory file size, that represents the current file size as viewed by the user. The existing file size, called the on-disk file size, is the one that get's written to the filesystem log and we only update it when it is safe to do so. When we write to a file beyond eof we only update the in- memory file size in the write operation. Later when the I/O operation, that flushes the cached data to disk completes, an I/O completion routine will update the on-disk file size. The on-disk file size will be updated to the maximum offset of the I/O or to the value of the in-memory file size if the I/O includes eof. SGI-PV: 958522 SGI-Modid: xfs-linux-melb:xfs-kern:28322a Signed-off-by: Lachlan McIlroy <lachlan@sgi.com> Signed-off-by: David Chinner <dgc@sgi.com> Signed-off-by: Tim Shimmin <tes@sgi.com>		2007-05-08 13:49:46 +10:00
..
linux-2.6	[XFS] Fix to prevent the notorious 'NULL files' problem after a crash.	2007-05-08 13:49:46 +10:00
quota	[XFS] Fix uquota and oquota enforcement problems.	2007-05-08 13:49:33 +10:00
support	[XFS] reducing the number of random number functions.	2007-05-08 13:49:03 +10:00
Kbuild	kbuild/xfs: introduce fs/xfs/Kbuild	2006-01-09 20:48:03 +01:00
Kconfig	[PATCH] BLOCK: Make it possible to disable the block layer [try #6]	2006-09-30 20:52:31 +02:00
Makefile	[XFS] Sort out some cosmetic differences between XFS trees.	2005-09-05 11:47:01 +10:00
Makefile-linux-2.6	[XFS] 956618: Linux crashes on boot with XFS-DMAPI filesystem when	2006-11-11 18:03:49 +11:00
xfs_acl.c	[XFS] Remove unused header files for MAC and CAP checking functionality.	2007-02-10 18:37:28 +11:00
xfs_acl.h	[XFS] Resolve a namespace collision on remaining vtypes for FreeBSD	2006-06-09 17:07:12 +10:00
xfs_ag.h	[XFS] endianess annotation for xfs_agfl_t. Trivial, xfs_agfl_t is always	2006-09-28 10:56:51 +10:00
xfs_alloc_btree.c	[XFS] Reduce endian flipping in alloc_btree, same as was done for	2006-09-28 11:05:40 +10:00
xfs_alloc_btree.h	[XFS] Remove unused arguments from the XFS_BTREE_*_ADDR macros.	2007-02-10 18:37:33 +11:00
xfs_alloc.c	[XFS] reducing the number of random number functions.	2007-05-08 13:49:03 +10:00
xfs_alloc.h	[XFS] Prevent free space oversubscription and xfssyncd looping.	2006-09-07 14:26:50 +10:00
xfs_arch.h	[XFS] Merge in trivial changes, sync up headers with userspace	2006-01-12 10:29:53 +11:00
xfs_attr_leaf.c	[XFS] The last argument "lsn" of xfs_trans_commit() is always called with	2007-05-08 13:48:42 +10:00
xfs_attr_leaf.h	[XFS] Add EA list callbacks for xfs kernel use. Cleanup some namespace	2006-09-28 11:01:37 +10:00
xfs_attr_sf.h	[XFS] endianess annotations for xfs_attr_shortform_t	2006-03-17 17:29:25 +11:00
xfs_attr.c	[XFS] The last argument "lsn" of xfs_trans_commit() is always called with	2007-05-08 13:48:42 +10:00
xfs_attr.h	[XFS] Add EA list callbacks for xfs kernel use. Cleanup some namespace	2006-09-28 11:01:37 +10:00
xfs_behavior.c	[XFS] remove bhv_lookup, _range version works aswell and has more useful	2006-09-28 10:58:52 +10:00
xfs_behavior.h	[XFS] remove bhv_lookup, _range version works aswell and has more useful	2006-09-28 10:58:52 +10:00
xfs_bit.c	[XFS] Keep stack usage down for 4k stacks by using noinline.	2007-02-10 18:34:56 +11:00
xfs_bit.h	[XFS] Update license/copyright notices to match the prefered SGI	2005-11-02 14:58:39 +11:00
xfs_bmap_btree.c	[XFS] Remove a bunch of unused functions from XFS.	2007-02-10 18:37:40 +11:00
xfs_bmap_btree.h	[XFS] Remove a bunch of unused functions from XFS.	2007-02-10 18:37:40 +11:00
xfs_bmap.c	[XFS] Fix to prevent the notorious 'NULL files' problem after a crash.	2007-05-08 13:49:46 +10:00
xfs_bmap.h	[XFS] Remove unused argument to xfs_bmap_finish	2007-02-10 18:37:16 +11:00
xfs_btree.c	[XFS] endianess annotations for xfs_bmbt_key Trivial as there are no	2006-09-28 10:58:17 +10:00
xfs_btree.h	[XFS] Remove unused arguments from the XFS_BTREE_*_ADDR macros.	2007-02-10 18:37:33 +11:00
xfs_buf_item.c	[XFS] Keep stack usage down for 4k stacks by using noinline.	2007-02-10 18:34:56 +11:00
xfs_buf_item.h	[XFS] Get rid of old 5.3/6.1 v1 log items. Cleanup patch sent in by Eric	2007-02-10 18:35:02 +11:00
xfs_clnt.h	[XFS] Implement the silent parameter to fill_super, previously ignored.	2006-03-31 13:04:17 +10:00
xfs_da_btree.c	[XFS] Remove a bunch of unused functions from XFS.	2007-02-10 18:37:40 +11:00
xfs_da_btree.h	[XFS] Remove a bunch of unused functions from XFS.	2007-02-10 18:37:40 +11:00
xfs_dfrag.c	[XFS] propogate return codes from flush routines	2007-05-08 13:49:27 +10:00
xfs_dfrag.h	[XFS] Add parameters to xfs_bmapi() and xfs_bunmapi() to have them report	2006-06-09 14:48:12 +10:00
xfs_dinode.h	[XFS] Remove version 1 directory code. Never functioned on Linux, just	2006-06-20 13:04:51 +10:00
xfs_dir2_block.c	[XFS] the "aendp" arg to xfs_dir2_data_freescan is always NULL, remove it.	2007-05-08 13:48:49 +10:00
xfs_dir2_block.h	[XFS] endianess annotations for xfs_dir2_block_tail_t	2006-03-17 17:27:56 +11:00
xfs_dir2_data.c	[XFS] the "aendp" arg to xfs_dir2_data_freescan is always NULL, remove it.	2007-05-08 13:48:49 +10:00
xfs_dir2_data.h	[XFS] the "aendp" arg to xfs_dir2_data_freescan is always NULL, remove it.	2007-05-08 13:48:49 +10:00
xfs_dir2_leaf.c	[XFS] the "aendp" arg to xfs_dir2_data_freescan is always NULL, remove it.	2007-05-08 13:48:49 +10:00
xfs_dir2_leaf.h	[XFS] endianess annotations for xfs_dir2_leaf_entry_t	2006-03-17 17:28:18 +11:00
xfs_dir2_node.c	[XFS] the "aendp" arg to xfs_dir2_data_freescan is always NULL, remove it.	2007-05-08 13:48:49 +10:00
xfs_dir2_node.h	[XFS] endianess annotations for xfs_dir2_free_hdr_t	2006-03-17 17:27:07 +11:00
xfs_dir2_sf.c	[XFS] Remove version 1 directory code. Never functioned on Linux, just	2006-06-20 13:04:51 +10:00
xfs_dir2_sf.h	[XFS] Update license/copyright notices to match the prefered SGI	2005-11-02 14:58:39 +11:00
xfs_dir2_trace.c	[XFS] Remove version 1 directory code. Never functioned on Linux, just	2006-06-20 13:04:51 +10:00
xfs_dir2_trace.h	[XFS] Update license/copyright notices to match the prefered SGI	2005-11-02 14:58:39 +11:00
xfs_dir2.c	[XFS] rename uio_read() to xfs_uio_read()	2006-11-11 18:04:41 +11:00
xfs_dir2.h	[XFS] Remove version 1 directory code. Never functioned on Linux, just	2006-06-20 13:04:51 +10:00
xfs_dmapi.h	[XFS] Remove KERNEL_VERSION macros from xfs_dmapi.h	2006-11-11 18:05:06 +11:00
xfs_dmops.c	[XFS] Remove version 1 directory code. Never functioned on Linux, just	2006-06-20 13:04:51 +10:00
xfs_error.c	[XFS] reducing the number of random number functions.	2007-05-08 13:49:03 +10:00
xfs_error.h	[XFS] Remove a bunch of unused functions from XFS.	2007-02-10 18:37:40 +11:00
xfs_extfree_item.c	[XFS] Keep stack usage down for 4k stacks by using noinline.	2007-02-10 18:34:56 +11:00
xfs_extfree_item.h	[XFS] cleanup the field types of some item format structures	2006-09-28 10:55:43 +10:00
xfs_fs.h	[XFS] Remove several macros that are no longer used anywhere	2006-09-28 11:02:57 +10:00
xfs_fsops.c	[XFS] The last argument "lsn" of xfs_trans_commit() is always called with	2007-05-08 13:48:42 +10:00
xfs_fsops.h	[XFS] Write log dummy record when freezing filesystem	2006-01-11 15:30:08 +11:00
xfs_ialloc_btree.c	[XFS] use NULL for pointer initialisation instead of zero-cast-to-ptr	2006-09-28 10:58:40 +10:00
xfs_ialloc_btree.h	[XFS] Remove unused arguments from the XFS_BTREE_*_ADDR macros.	2007-02-10 18:37:33 +11:00
xfs_ialloc.c	[XFS] Keep stack usage down for 4k stacks by using noinline.	2007-02-10 18:34:56 +11:00
xfs_ialloc.h	[XFS] Update license/copyright notices to match the prefered SGI	2005-11-02 14:58:39 +11:00
xfs_iget.c	[XFS] Prevent a deadlock when xfslogd unpins inodes.	2006-11-11 18:05:00 +11:00
xfs_imap.h	[XFS] Update license/copyright notices to match the prefered SGI	2005-11-02 14:58:39 +11:00
xfs_inode_item.c	[XFS] Keep stack usage down for 4k stacks by using noinline.	2007-02-10 18:34:56 +11:00
xfs_inode_item.h	[XFS] cleanup the field types of some item format structures	2006-09-28 10:55:43 +10:00
xfs_inode.c	[XFS] Fix to prevent the notorious 'NULL files' problem after a crash.	2007-05-08 13:49:46 +10:00
xfs_inode.h	[XFS] Fix to prevent the notorious 'NULL files' problem after a crash.	2007-05-08 13:49:46 +10:00
xfs_inum.h	[XFS] Update license/copyright notices to match the prefered SGI	2005-11-02 14:58:39 +11:00
xfs_iocore.c	[XFS] Fix to prevent the notorious 'NULL files' problem after a crash.	2007-05-08 13:49:46 +10:00
xfs_iomap.c	[XFS] Fix to prevent the notorious 'NULL files' problem after a crash.	2007-05-08 13:49:46 +10:00
xfs_iomap.h	[XFS] Fix to prevent the notorious 'NULL files' problem after a crash.	2007-05-08 13:49:46 +10:00
xfs_itable.c	[XFS] 955947: Infinite loop in xfs_bulkstat() on formatter() error	2006-09-28 11:06:21 +10:00
xfs_itable.h	[XFS] pv 956241, author: nathans, rv: vapo - make ino validation checks	2006-09-28 11:06:15 +10:00
xfs_log_priv.h	[XFS] Fixes the leak in reservation space because we weren't ungranting	2006-09-28 11:04:16 +10:00
xfs_log_recover.c	[XFS] remove more misc. unused args	2007-05-08 13:48:56 +10:00
xfs_log_recover.h	[XFS] Update license/copyright notices to match the prefered SGI	2005-11-02 14:58:39 +11:00
xfs_log.c	[XFS] Fixes the leak in reservation space because we weren't ungranting	2006-09-28 11:04:16 +10:00
xfs_log.h	[XFS] Remove several macros that are no longer used anywhere	2006-09-28 11:02:57 +10:00
xfs_mount.c	[XFS] The last argument "lsn" of xfs_trans_commit() is always called with	2007-05-08 13:48:42 +10:00
xfs_mount.h	[XFS] Re-initialize the per-cpu superblock counters after recovery.	2007-02-10 18:36:29 +11:00
xfs_qmops.c	[XFS] The last argument "lsn" of xfs_trans_commit() is always called with	2007-05-08 13:48:42 +10:00
xfs_quota.h	[XFS] Fix uquota and oquota enforcement problems.	2007-05-08 13:49:33 +10:00
xfs_refcache.h	[XFS] Cleanup cosmetic differences between source trees.	2005-11-03 16:14:31 +11:00
xfs_rename.c	[XFS] The last argument "lsn" of xfs_trans_commit() is always called with	2007-05-08 13:48:42 +10:00
xfs_rtalloc.c	[XFS] The last argument "lsn" of xfs_trans_commit() is always called with	2007-05-08 13:48:42 +10:00
xfs_rtalloc.h	[XFS] Remove a bunch of unused functions from XFS.	2007-02-10 18:37:40 +11:00
xfs_rw.c	[XFS] The last argument "lsn" of xfs_trans_commit() is always called with	2007-05-08 13:48:42 +10:00
xfs_rw.h	[XFS] Push some common code out of write path into core XFS code for	2006-06-19 08:39:53 +10:00
xfs_sb.h	[XFS] Remove several macros that are no longer used anywhere	2006-09-28 11:02:57 +10:00
xfs_trans_ail.c	[XFS] Workaround log space issue by increasing XFS_TRANS_PUSH_AIL_RESTARTS	2007-02-10 18:35:52 +11:00
xfs_trans_buf.c	[XFS] Remove version 1 directory code. Never functioned on Linux, just	2006-06-20 13:04:51 +10:00
xfs_trans_extfree.c	[XFS] Remove version 1 directory code. Never functioned on Linux, just	2006-06-20 13:04:51 +10:00
xfs_trans_inode.c	[XFS] Remove version 1 directory code. Never functioned on Linux, just	2006-06-20 13:04:51 +10:00
xfs_trans_item.c	[XFS] Portability changes: remove prdev, stick to one diagnostic	2006-06-09 15:29:40 +10:00
xfs_trans_priv.h	[XFS] Add lock annotations to xfs_trans_update_ail and	2006-09-28 11:04:07 +10:00
xfs_trans_space.h	[XFS] Remove version 1 directory code. Never functioned on Linux, just	2006-06-20 13:04:51 +10:00
xfs_trans.c	[XFS] The last argument "lsn" of xfs_trans_commit() is always called with	2007-05-08 13:48:42 +10:00
xfs_trans.h	[XFS] The last argument "lsn" of xfs_trans_commit() is always called with	2007-05-08 13:48:42 +10:00
xfs_types.h	[XFS] Update license/copyright notices to match the prefered SGI	2005-11-02 14:58:39 +11:00
xfs_utils.c	[XFS] propogate return codes from flush routines	2007-05-08 13:49:27 +10:00
xfs_utils.h	[XFS] Resolve a namespace collision on remaining vtypes for FreeBSD	2006-06-09 17:07:12 +10:00
xfs_vfsops.c	[XFS] propogate return codes from flush routines	2007-05-08 13:49:27 +10:00
xfs_vnodeops.c	[XFS] Fix to prevent the notorious 'NULL files' problem after a crash.	2007-05-08 13:49:46 +10:00
xfs.h	[XFS] 956618: Linux crashes on boot with XFS-DMAPI filesystem when	2006-11-11 18:03:49 +11:00