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David Howells 12debc4248 iget: remove iget() and the read_inode() super op as being obsolete 
Remove the old iget() call and the read_inode() superblock operation it uses
as these are really obsolete, and the use of read_inode() does not produce
proper error handling (no distinction between ENOMEM and EIO when marking an
inode bad).

Furthermore, this removes the temptation to use iget() to find an inode by
number in a filesystem from code outside that filesystem.

iget_locked() should be used instead.  A new function is added in an earlier
patch (iget_failed) that is to be called to mark an inode as bad, unlock it
and release it should the get routine fail.  Mark iget() and read_inode() as
being obsolete and remove references to them from the documentation.

Typically a filesystem will be modified such that the read_inode function
becomes an internal iget function, for example the following:

	void thingyfs_read_inode(struct inode *inode)
	{
		...
	}

would be changed into something like:

	struct inode *thingyfs_iget(struct super_block *sp, unsigned long ino)
	{
		struct inode *inode;
		int ret;

		inode = iget_locked(sb, ino);
		if (!inode)
			return ERR_PTR(-ENOMEM);
		if (!(inode->i_state & I_NEW))
			return inode;

		...
		unlock_new_inode(inode);
		return inode;
	error:
		iget_failed(inode);
		return ERR_PTR(ret);
	}

and then thingyfs_iget() would be called rather than iget(), for example:

	ret = -EINVAL;
	inode = iget(sb, ino);
	if (!inode || is_bad_inode(inode))
		goto error;

becomes:

	inode = thingyfs_iget(sb, ino);
	if (IS_ERR(inode)) {
		ret = PTR_ERR(inode);
		goto error;
	}

Note that is_bad_inode() does not need to be called.  The error returned by
thingyfs_iget() should render it unnecessary.

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 		2008-02-07 08:42:29 -08:00
..
9p Convert ERR_PTR(PTR_ERR(p)) instances to ERR_CAST(p) 2008-02-07 08:42:26 -08:00
adfs Slab API: remove useless ctor parameter and reorder parameters 2007-10-17 08:42:45 -07:00
affs iget: stop AFFS from using iget() and read_inode() 2008-02-07 08:42:27 -08:00
afs iget: use iget_failed() in AFS 2008-02-07 08:42:26 -08:00
autofs iget: stop autofs from using iget() and read_inode() 2008-02-07 08:42:27 -08:00
autofs4 pid namespaces: round up the API 2007-10-19 11:53:37 -07:00
befs iget: stop BEFS from using iget() and read_inode() 2008-02-07 08:42:27 -08:00
bfs iget: stop BFS from using iget() and read_inode() 2008-02-07 08:42:27 -08:00
cifs iget: stop CIFS from using iget() and read_inode() 2008-02-07 08:42:27 -08:00
coda coda: convert struct class_device to struct device 2008-01-24 20:40:05 -08:00
configfs configfs: file.c fix possible recursive locking 2008-01-25 15:05:47 -08:00
cramfs fs/cramfs/inode.c: replace hardcoded value with preprocessor constant 2007-10-18 14:37:29 -07:00
debugfs Kobject: convert fs/* from kobject_unregister() to kobject_put() 2008-01-24 20:40:40 -08:00
devpts
…
dlm dlm: static initialization improvements 2008-01-30 11:04:43 -06:00
ecryptfs ecryptfs: check for existing key_tfm at mount time 2008-02-06 10:41:13 -08:00
efs iget: stop EFS from using iget() and read_inode() 2008-02-07 08:42:27 -08:00
exportfs exportfs: update documentation 2007-10-22 08:13:21 -07:00
ext2 iget: stop EXT2 from using iget() and read_inode() 2008-02-07 08:42:27 -08:00
ext3 iget: stop EXT3 from using iget() and read_inode() 2008-02-07 08:42:27 -08:00
ext4 iget: stop EXT4 from using iget() and read_inode() 2008-02-07 08:42:27 -08:00
fat iget: stop FAT from using iget() and read_inode() 2008-02-07 08:42:28 -08:00
freevxfs iget: stop FreeVXFS from using iget() and read_inode() 2008-02-07 08:42:28 -08:00
fuse iget: stop FUSE from using iget() and read_inode() 2008-02-07 08:42:28 -08:00
gfs2 iget: use iget_failed() in GFS2 2008-02-07 08:42:27 -08:00
hfs hfs: update comment to reflect actual init and exit routines 2008-02-06 10:41:05 -08:00
hfsplus iget: stop HFSPLUS from using iget() and read_inode() 2008-02-07 08:42:28 -08:00
hostfs iget: stop HOSTFS from using iget() and read_inode() 2008-02-07 08:42:29 -08:00
hpfs Slab API: remove useless ctor parameter and reorder parameters 2007-10-17 08:42:45 -07:00
hppfs iget: stop HPPFS from using iget() and read_inode() 2008-02-07 08:42:29 -08:00
hugetlbfs hugetlb: allow sticky directory mount option 2008-02-05 09:44:14 -08:00
isofs iget: stop ISOFS from using read_inode() 2008-02-07 08:42:28 -08:00
jbd make jbd/journal.c:__journal_abort_hard() static 2008-02-06 10:41:20 -08:00
jbd2 BKL-removal: remove incorrect comment refering to lock_kernel() from jbd/jbd2 2008-02-06 10:41:20 -08:00
jffs2 iget: stop JFFS2 from using iget() and read_inode() 2008-02-07 08:42:28 -08:00
jfs iget: stop JFS from using iget() and read_inode() 2008-02-07 08:42:28 -08:00
lockd NLM: tear down RPC clients in nlm_shutdown_hosts 2008-02-01 16:42:15 -05:00
minix iget: stop the MINIX filesystem from using iget() and read_inode() 2008-02-07 08:42:28 -08:00
msdos
…
ncpfs NCPFS: update diagnostic strings to match routine names. 2008-02-06 10:41:05 -08:00
nfs Convert ERR_PTR(PTR_ERR(p)) instances to ERR_CAST(p) 2008-02-07 08:42:26 -08:00
nfs_common
…
nfsd Convert ERR_PTR(PTR_ERR(p)) instances to ERR_CAST(p) 2008-02-07 08:42:26 -08:00
nls sparse pointer use of zero as null 2007-10-18 14:37:31 -07:00
ntfs is_vmalloc_addr(): Check if an address is within the vmalloc boundaries 2008-02-05 09:44:14 -08:00
ocfs2 Pagecache zeroing: zero_user_segment, zero_user_segments and zero_user 2008-02-05 09:44:13 -08:00
openpromfs iget: stop OPENPROMFS from using iget() and read_inode() 2008-02-07 08:42:29 -08:00
partitions partition: use DEFAULT_SGI_PARTITION for SGI_PARTION default 2008-02-06 10:41:08 -08:00
proc iget: stop PROCFS from using iget() and read_inode() 2008-02-07 08:42:28 -08:00
qnx4 iget: stop QNX4 from using iget() and read_inode() 2008-02-07 08:42:28 -08:00
ramfs Remove valueless definition of hard-selected RAMFS option 2007-10-17 08:42:56 -07:00
reiserfs Convert ERR_PTR(PTR_ERR(p)) instances to ERR_CAST(p) 2008-02-07 08:42:26 -08:00
romfs iget: stop ROMFS from using iget() and read_inode() 2008-02-07 08:42:28 -08:00
smbfs smbfs: fix calculation of kernel_recvmsg size parameter in smb_receive() 2008-02-06 10:41:02 -08:00
sysfs Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6 2008-01-25 17:19:08 -08:00
sysv iget: stop the SYSV filesystem from using iget() and read_inode() 2008-02-07 08:42:29 -08:00
udf fs/udf/balloc.c: mark a variable as uninitialized_var() 2007-10-17 08:43:00 -07:00
ufs iget: stop UFS from using iget() and read_inode() 2008-02-07 08:42:29 -08:00
vfat Convert ERR_PTR(PTR_ERR(p)) instances to ERR_CAST(p) 2008-02-07 08:42:26 -08:00
xfs is_vmalloc_addr(): Check if an address is within the vmalloc boundaries 2008-02-05 09:44:14 -08:00
Kconfig fs menu: small reorg 2008-02-07 08:42:24 -08:00
Kconfig.binfmt x86: compat_binfmt_elf Kconfig 2008-01-30 13:31:46 +01:00
Makefile x86: compat_binfmt_elf Kconfig 2008-01-30 13:31:46 +01:00
aio.c core: remove last users of empty FASTCALL macro 2008-01-30 13:31:17 +01:00
anon_inodes.c anon-inodes use open coded atomic_inc for the shared inode 2007-10-17 08:43:00 -07:00
attr.c VFS: make notify_change pass ATTR_KILL_S*ID to setattr operations 2007-10-18 14:37:22 -07:00
bad_inode.c iget: introduce a function to register iget failure 2008-02-07 08:42:26 -08:00
binfmt_aout.c mm: fix exit_mmap BUG() on a.out binary exit 2007-12-20 07:49:53 -08:00
binfmt_elf.c brk randomization: introduce CONFIG_COMPAT_BRK 2008-02-06 22:39:44 +01:00
binfmt_elf_fdpic.c pid namespaces: changes to show virtual ids to user 2007-10-19 11:53:40 -07:00
binfmt_em86.c Convert files to UTF-8 and some cleanups 2007-10-19 23:21:04 +02:00
binfmt_flat.c binfmt_flat: warning fixes 2007-10-17 08:42:54 -07:00
binfmt_misc.c Convert files to UTF-8 and some cleanups 2007-10-19 23:21:04 +02:00
binfmt_script.c Convert files to UTF-8 and some cleanups 2007-10-19 23:21:04 +02:00
binfmt_som.c core_pattern: ignore RLIMIT_CORE if core_pattern is a pipe 2007-10-17 08:42:50 -07:00
bio.c __bio_clone: don't calculate hw/phys segment counts 2008-01-28 10:04:46 +01:00
block_dev.c kill an unused PTR_ERR in bdev_cache_init() 2008-02-06 10:41:06 -08:00
buffer.c bufferhead: revert constructor removal 2008-02-05 09:44:14 -08:00
char_dev.c Kobject: rename kobject_init_ng() to kobject_init() 2008-01-24 20:40:38 -08:00
compat.c fs: remove dead config CONFIG_HAS_COMPAT_EPOLL_EVENT symbol 2008-02-06 10:41:03 -08:00
compat_binfmt_elf.c x86: compat_binfmt_elf 2008-01-30 13:31:46 +01:00
compat_ioctl.c VFS: swap do_ioctl and vfs_ioctl names 2008-02-07 08:42:16 -08:00
dcache.c inotify: remove debug code 2008-02-06 10:41:07 -08:00
dcookies.c Remove fs.h from mm.h 2007-07-29 17:09:29 -07:00
direct-io.c Pagecache zeroing: zero_user_segment, zero_user_segments and zero_user 2008-02-05 09:44:13 -08:00
dnotify.c mm: Remove slab destructors from kmem_cache_create(). 2007-07-20 10:11:58 +09:00
dquot.c quota: improve inode list scanning in add_dquot_ref() 2008-02-06 10:41:07 -08:00
drop_caches.c invalidate_mapping_pages(): add cond_resched 2007-07-16 09:05:36 -07:00
eventfd.c fs/eventfd.c should #include <linux/syscalls.h> 2008-02-06 10:41:03 -08:00
eventpoll.c lockdep: annotate epoll 2008-02-05 09:44:07 -08:00
exec.c exec: rework the group exit and fix the race with kill 2008-02-05 09:44:07 -08:00
fcntl.c pid namespaces: changes to show virtual ids to user 2007-10-19 11:53:40 -07:00
fifo.c
…
file.c get rid of NR_OPEN and introduce a sysctl_nr_open 2008-02-06 10:41:06 -08:00
file_table.c fs/file_table.c: use list_for_each_entry() instead of list_for_each() 2007-10-19 11:53:38 -07:00
filesystems.c
…
fs-writeback.c fs: use list_for_each_entry_reverse and kill sb_entry 2008-02-06 10:41:05 -08:00
generic_acl.c Introduce is_owner_or_cap() to wrap CAP_FOWNER use with fsuid check 2007-07-17 12:00:03 -07:00
inode.c iget: remove iget() and the read_inode() super op as being obsolete 2008-02-07 08:42:29 -08:00
inotify.c inotify: remove debug code 2008-02-06 10:41:07 -08:00
inotify_user.c SIGIO-driven I/O with inotify queues 2008-02-06 10:41:00 -08:00
internal.h
…
ioctl.c VFS: factor out three helpers for FIBMAP/FIONBIO/FIOASYNC file ioctls 2008-02-07 08:42:16 -08:00
ioprio.c cfq-iosched: relax IOPRIO_CLASS_IDLE restrictions 2008-01-28 11:38:15 +01:00
libfs.c Pagecache zeroing: zero_user_segment, zero_user_segments and zero_user 2008-02-05 09:44:13 -08:00
locks.c pid-namespaces-vs-locks-interaction 2008-02-03 17:51:36 -05:00
mbcache.c fs: Fix to correct the mbcache entries counter 2007-10-25 15:18:29 -07:00
mpage.c Pagecache zeroing: zero_user_segment, zero_user_segments and zero_user 2008-02-05 09:44:13 -08:00
namei.c inotify: send IN_ATTRIB events when link count changes 2008-02-06 10:41:05 -08:00
namespace.c Use ilog2() in fs/namespace.c 2008-02-06 10:41:09 -08:00
nfsctl.c nfsctl: use vfs_path_lookup 2007-07-19 10:04:45 -07:00
no-block.c
…
open.c mark sys_open/sys_read exports unused 2007-11-14 18:45:42 -08:00
pipe.c sched: affine sync wakeups 2007-10-15 17:00:19 +02:00
pnode.c MNT_UNBINDABLE fix 2008-02-06 10:41:02 -08:00
pnode.h [PATCH] new helpers - collect_mounts() and release_collected_mounts() 2007-10-21 02:37:25 -04:00
posix_acl.c
…
quota.c Convert ERR_PTR(PTR_ERR(p)) instances to ERR_CAST(p) 2008-02-07 08:42:26 -08:00
quota_v1.c
…
quota_v2.c
…
read_write.c ext4: export iov_shorten from kernel for ext4's use 2008-01-28 23:58:27 -05:00
read_write.h
…
readdir.c Use mutex_lock_killable in vfs_readdir 2007-12-06 17:39:54 -05:00
select.c make sys_poll() wait at least timeout ms 2008-02-06 10:41:09 -08:00
seq_file.c [FS] seq_file: Introduce the seq_open_private() 2007-10-10 16:55:33 -07:00
signalfd.c fs/signalfd.c should #include <linux/syscalls.h> 2008-02-06 10:41:03 -08:00
splice.c splice: always updated atime in direct splice 2008-02-01 09:26:32 +01:00
stack.c
…
stat.c
…
super.c Convert files to UTF-8 and some cleanups 2007-10-19 23:21:04 +02:00
sync.c
…
timerfd.c timerfd: new timerfd API 2008-02-05 09:44:07 -08:00
utimes.c fs/utimes.c should #include <linux/syscalls.h> 2008-02-06 10:41:03 -08:00
xattr.c VFS: Reorder vfs_getxattr to avoid unnecessary calls to the LSM 2008-02-05 09:44:20 -08:00
xattr_acl.c
…