Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs

Pull ext3 removal, quota & udf fixes from Jan Kara:
 "The biggest change in the pull is the removal of ext3 filesystem
  driver (~28k lines removed).  Ext4 driver is a full featured
  replacement these days and both RH and SUSE use it for several years
  without issues.  Also there are some workarounds in VM & block layer
  mainly for ext3 which we could eventually get rid of.

  Other larger change is addition of proper error handling for
  dquot_initialize().  The rest is small fixes and cleanups"

[ I wasn't convinced about the ext3 removal and worried about things
  falling through the cracks for legacy users, but ext4 maintainers
  piped up and were all unanimously in favor of removal, and maintaining
  all legacy ext3 support inside ext4.   - Linus ]

* 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs:
  udf: Don't modify filesystem for read-only mounts
  quota: remove an unneeded condition
  ext4: memory leak on error in ext4_symlink()
  mm/Kconfig: NEED_BOUNCE_POOL: clean-up condition
  ext4: Improve ext4 Kconfig test
  block: Remove forced page bouncing under IO
  fs: Remove ext3 filesystem driver
  doc: Update doc about journalling layer
  jfs: Handle error from dquot_initialize()
  reiserfs: Handle error from dquot_initialize()
  ocfs2: Handle error from dquot_initialize()
  ext4: Handle error from dquot_initialize()
  ext2: Handle error from dquot_initalize()
  quota: Propagate error from ->acquire_dquot()

Documentation/filesystems/ext2.txt

@@ -360,8 +360,8 @@ and are copied into the filesystem.  If a transaction is incomplete at
 the time of the crash, then there is no guarantee of consistency for
 the blocks in that transaction so they are discarded (which means any
 filesystem changes they represent are also lost).
-Check Documentation/filesystems/ext3.txt if you want to read more about
-ext3 and journaling.
+Check Documentation/filesystems/ext4.txt if you want to read more about
+ext4 and journaling.
 
 References
 ==========

Documentation/filesystems/ext3.txt

@@ -6,210 +6,7 @@ Ext3 was originally released in September 1999. Written by Stephen Tweedie
 for the 2.2 branch, and ported to 2.4 kernels by Peter Braam, Andreas Dilger,
 Andrew Morton, Alexander Viro, Ted Ts'o and Stephen Tweedie.
 
-Ext3 is the ext2 filesystem enhanced with journalling capabilities.
+Ext3 is the ext2 filesystem enhanced with journalling capabilities. The
+filesystem is a subset of ext4 filesystem so use ext4 driver for accessing
+ext3 filesystems.
 
-Options
-=======
-
-When mounting an ext3 filesystem, the following option are accepted:
-(*) == default
-
-ro			Mount filesystem read only. Note that ext3 will replay
-			the journal (and thus write to the partition) even when
-			mounted "read only". Mount options "ro,noload" can be
-			used to prevent writes to the filesystem.
-
-journal=update		Update the ext3 file system's journal to the current
-			format.
-
-journal=inum		When a journal already exists, this option is ignored.
-			Otherwise, it specifies the number of the inode which
-			will represent the ext3 file system's journal file.
-
-journal_path=path
-journal_dev=devnum	When the external journal device's major/minor numbers
-			have changed, these options allow the user to specify
-			the new journal location.  The journal device is
-			identified through either its new major/minor numbers
-			encoded in devnum, or via a path to the device.
-
-norecovery		Don't load the journal on mounting. Note that this forces
-noload			mount of inconsistent filesystem, which can lead to
-			various problems.
-
-data=journal		All data are committed into the journal prior to being
-			written into the main file system.
-
-data=ordered	(*)	All data are forced directly out to the main file
-			system prior to its metadata being committed to the
-			journal.
-
-data=writeback		Data ordering is not preserved, data may be written
-			into the main file system after its metadata has been
-			committed to the journal.
-
-commit=nrsec	(*)	Ext3 can be told to sync all its data and metadata
-			every 'nrsec' seconds. The default value is 5 seconds.
-			This means that if you lose your power, you will lose
-			as much as the latest 5 seconds of work (your
-			filesystem will not be damaged though, thanks to the
-			journaling).  This default value (or any low value)
-			will hurt performance, but it's good for data-safety.
-			Setting it to 0 will have the same effect as leaving
-			it at the default (5 seconds).
-			Setting it to very large values will improve
-			performance.
-
-barrier=<0|1(*)>	This enables/disables the use of write barriers in
-barrier	(*)		the jbd code.  barrier=0 disables, barrier=1 enables.
-nobarrier		This also requires an IO stack which can support
-			barriers, and if jbd gets an error on a barrier
-			write, it will disable again with a warning.
-			Write barriers enforce proper on-disk ordering
-			of journal commits, making volatile disk write caches
-			safe to use, at some performance penalty.  If
-			your disks are battery-backed in one way or another,
-			disabling barriers may safely improve performance.
-			The mount options "barrier" and "nobarrier" can
-			also be used to enable or disable barriers, for
-			consistency with other ext3 mount options.
-
-user_xattr		Enables Extended User Attributes.  Additionally, you
-			need to have extended attribute support enabled in the
-			kernel configuration (CONFIG_EXT3_FS_XATTR).  See the
-			attr(5) manual page and http://acl.bestbits.at/ to
-			learn more about extended attributes.
-
-nouser_xattr		Disables Extended User Attributes.
-
-acl			Enables POSIX Access Control Lists support.
-			Additionally, you need to have ACL support enabled in
-			the kernel configuration (CONFIG_EXT3_FS_POSIX_ACL).
-			See the acl(5) manual page and http://acl.bestbits.at/
-			for more information.
-
-noacl			This option disables POSIX Access Control List
-			support.
-
-reservation
-
-noreservation
-
-bsddf 		(*)	Make 'df' act like BSD.
-minixdf			Make 'df' act like Minix.
-
-check=none		Don't do extra checking of bitmaps on mount.
-nocheck
-
-debug			Extra debugging information is sent to syslog.
-
-errors=remount-ro	Remount the filesystem read-only on an error.
-errors=continue		Keep going on a filesystem error.
-errors=panic		Panic and halt the machine if an error occurs.
-			(These mount options override the errors behavior
-			specified in the superblock, which can be
-			configured using tune2fs.)
-
-data_err=ignore(*)	Just print an error message if an error occurs
-			in a file data buffer in ordered mode.
-data_err=abort		Abort the journal if an error occurs in a file
-			data buffer in ordered mode.
-
-grpid			Give objects the same group ID as their creator.
-bsdgroups
-
-nogrpid		(*)	New objects have the group ID of their creator.
-sysvgroups
-
-resgid=n		The group ID which may use the reserved blocks.
-
-resuid=n		The user ID which may use the reserved blocks.
-
-sb=n			Use alternate superblock at this location.
-
-quota			These options are ignored by the filesystem. They
-noquota			are used only by quota tools to recognize volumes
-grpquota		where quota should be turned on. See documentation
-usrquota		in the quota-tools package for more details
-			(http://sourceforge.net/projects/linuxquota).
-
-jqfmt=<quota type>	These options tell filesystem details about quota
-usrjquota=<file>	so that quota information can be properly updated
-grpjquota=<file>	during journal replay. They replace the above
-			quota options. See documentation in the quota-tools
-			package for more details
-			(http://sourceforge.net/projects/linuxquota).
-
-Specification
-=============
-Ext3 shares all disk implementation with the ext2 filesystem, and adds
-transactions capabilities to ext2.  Journaling is done by the Journaling Block
-Device layer.
-
-Journaling Block Device layer
------------------------------
-The Journaling Block Device layer (JBD) isn't ext3 specific.  It was designed
-to add journaling capabilities to a block device.  The ext3 filesystem code
-will inform the JBD of modifications it is performing (called a transaction).
-The journal supports the transactions start and stop, and in case of a crash,
-the journal can replay the transactions to quickly put the partition back into
-a consistent state.
-
-Handles represent a single atomic update to a filesystem.  JBD can handle an
-external journal on a block device.
-
-Data Mode
----------
-There are 3 different data modes:
-
-* writeback mode
-In data=writeback mode, ext3 does not journal data at all.  This mode provides
-a similar level of journaling as that of XFS, JFS, and ReiserFS in its default
-mode - metadata journaling.  A crash+recovery can cause incorrect data to
-appear in files which were written shortly before the crash.  This mode will
-typically provide the best ext3 performance.
-
-* ordered mode
-In data=ordered mode, ext3 only officially journals metadata, but it logically
-groups metadata and data blocks into a single unit called a transaction.  When
-it's time to write the new metadata out to disk, the associated data blocks
-are written first.  In general, this mode performs slightly slower than
-writeback but significantly faster than journal mode.
-
-* journal mode
-data=journal mode provides full data and metadata journaling.  All new data is
-written to the journal first, and then to its final location.
-In the event of a crash, the journal can be replayed, bringing both data and
-metadata into a consistent state.  This mode is the slowest except when data
-needs to be read from and written to disk at the same time where it
-outperforms all other modes.
-
-Compatibility
--------------
-
-Ext2 partitions can be easily convert to ext3, with `tune2fs -j <dev>`.
-Ext3 is fully compatible with Ext2.  Ext3 partitions can easily be mounted as
-Ext2.
-
-
-External Tools
-==============
-See manual pages to learn more.
-
-tune2fs: 	create a ext3 journal on a ext2 partition with the -j flag.
-mke2fs: 	create a ext3 partition with the -j flag.
-debugfs: 	ext2 and ext3 file system debugger.
-ext2online:	online (mounted) ext2 and ext3 filesystem resizer
-
-
-References
-==========
-
-kernel source:	<file:fs/ext3/>
-		<file:fs/jbd/>
-
-programs: 	http://e2fsprogs.sourceforge.net/
-		http://ext2resize.sourceforge.net
-
-useful links:	http://www.ibm.com/developerworks/library/l-fs7/index.html
-        http://www.ibm.com/developerworks/library/l-fs8/index.html

Documentation/filesystems/vfs.txt

@@ -769,7 +769,7 @@ struct address_space_operations {
 	to stall to allow flushers a chance to complete some IO. Ordinarily
 	it can use PageDirty and PageWriteback but some filesystems have
 	more complex state (unstable pages in NFS prevent reclaim) or
-	do not set those flags due to locking problems (jbd). This callback
+	do not set those flags due to locking problems. This callback
 	allows a filesystem to indicate to the VM if a page should be
 	treated as dirty or writeback for the purposes of stalling.
 

MAINTAINERS

@@ -4078,15 +4078,6 @@ F:	Documentation/filesystems/ext2.txt
 F:	fs/ext2/
 F:	include/linux/ext2*
 
-EXT3 FILE SYSTEM
-M:	Jan Kara <jack@suse.com>
-M:	Andrew Morton <akpm@linux-foundation.org>
-M:	Andreas Dilger <adilger.kernel@dilger.ca>
-L:	linux-ext4@vger.kernel.org
-S:	Maintained
-F:	Documentation/filesystems/ext3.txt
-F:	fs/ext3/
-
 EXT4 FILE SYSTEM
 M:	"Theodore Ts'o" <tytso@mit.edu>
 M:	Andreas Dilger <adilger.kernel@dilger.ca>
@@ -5787,16 +5778,9 @@ S:	Maintained
 F:	fs/jffs2/
 F:	include/uapi/linux/jffs2.h
 
-JOURNALLING LAYER FOR BLOCK DEVICES (JBD)
-M:	Andrew Morton <akpm@linux-foundation.org>
-M:	Jan Kara <jack@suse.com>
-L:	linux-ext4@vger.kernel.org
-S:	Maintained
-F:	fs/jbd/
-F:	include/linux/jbd.h
-
 JOURNALLING LAYER FOR BLOCK DEVICES (JBD2)
 M:	"Theodore Ts'o" <tytso@mit.edu>
+M:	Jan Kara <jack@suse.com>
 L:	linux-ext4@vger.kernel.org
 S:	Maintained
 F:	fs/jbd2/

block/bounce.c

@@ -177,26 +177,8 @@ static void bounce_end_io_read_isa(struct bio *bio)
 	__bounce_end_io_read(bio, isa_page_pool);
 }
 
-#ifdef CONFIG_NEED_BOUNCE_POOL
-static int must_snapshot_stable_pages(struct request_queue *q, struct bio *bio)
-{
-	if (bio_data_dir(bio) != WRITE)
-		return 0;
-
-	if (!bdi_cap_stable_pages_required(&q->backing_dev_info))
-		return 0;
-
-	return bio_flagged(bio, BIO_SNAP_STABLE);
-}
-#else
-static int must_snapshot_stable_pages(struct request_queue *q, struct bio *bio)
-{
-	return 0;
-}
-#endif /* CONFIG_NEED_BOUNCE_POOL */
-
 static void __blk_queue_bounce(struct request_queue *q, struct bio **bio_orig,
-			       mempool_t *pool, int force)
+			       mempool_t *pool)
 {
 	struct bio *bio;
 	int rw = bio_data_dir(*bio_orig);
@@ -204,8 +186,6 @@ static void __blk_queue_bounce(struct request_queue *q, struct bio **bio_orig,
 	struct bvec_iter iter;
 	unsigned i;
 
-	if (force)
-		goto bounce;
 	bio_for_each_segment(from, *bio_orig, iter)
 		if (page_to_pfn(from.bv_page) > queue_bounce_pfn(q))
 			goto bounce;
@@ -217,7 +197,7 @@ static void __blk_queue_bounce(struct request_queue *q, struct bio **bio_orig,
 	bio_for_each_segment_all(to, bio, i) {
 		struct page *page = to->bv_page;
 
-		if (page_to_pfn(page) <= queue_bounce_pfn(q) && !force)
+		if (page_to_pfn(page) <= queue_bounce_pfn(q))
 			continue;
 
 		to->bv_page = mempool_alloc(pool, q->bounce_gfp);
@@ -255,7 +235,6 @@ static void __blk_queue_bounce(struct request_queue *q, struct bio **bio_orig,
 
 void blk_queue_bounce(struct request_queue *q, struct bio **bio_orig)
 {
-	int must_bounce;
 	mempool_t *pool;
 
 	/*
@@ -264,15 +243,13 @@ void blk_queue_bounce(struct request_queue *q, struct bio **bio_orig)
 	if (!bio_has_data(*bio_orig))
 		return;
 
-	must_bounce = must_snapshot_stable_pages(q, *bio_orig);
-
 	/*
 	 * for non-isa bounce case, just check if the bounce pfn is equal
 	 * to or bigger than the highest pfn in the system -- in that case,
 	 * don't waste time iterating over bio segments
 	 */
 	if (!(q->bounce_gfp & GFP_DMA)) {
-		if (queue_bounce_pfn(q) >= blk_max_pfn && !must_bounce)
+		if (queue_bounce_pfn(q) >= blk_max_pfn)
 			return;
 		pool = page_pool;
 	} else {
@@ -283,7 +260,7 @@ void blk_queue_bounce(struct request_queue *q, struct bio **bio_orig)
 	/*
 	 * slow path
 	 */
-	__blk_queue_bounce(q, bio_orig, pool, must_bounce);
+	__blk_queue_bounce(q, bio_orig, pool);
 }
 
 EXPORT_SYMBOL(blk_queue_bounce);

fs/Kconfig

@@ -11,18 +11,15 @@ config DCACHE_WORD_ACCESS
 if BLOCK
 
 source "fs/ext2/Kconfig"
-source "fs/ext3/Kconfig"
 source "fs/ext4/Kconfig"
-source "fs/jbd/Kconfig"
 source "fs/jbd2/Kconfig"
 
 config FS_MBCACHE
 # Meta block cache for Extended Attributes (ext2/ext3/ext4)
 	tristate
 	default y if EXT2_FS=y && EXT2_FS_XATTR
-	default y if EXT3_FS=y && EXT3_FS_XATTR
 	default y if EXT4_FS=y
-	default m if EXT2_FS_XATTR || EXT3_FS_XATTR || EXT4_FS
+	default m if EXT2_FS_XATTR || EXT4_FS
 
 source "fs/reiserfs/Kconfig"
 source "fs/jfs/Kconfig"

fs/Makefile

@@ -62,12 +62,10 @@ obj-$(CONFIG_DLM)		+= dlm/
 # Do not add any filesystems before this line
 obj-$(CONFIG_FSCACHE)		+= fscache/
 obj-$(CONFIG_REISERFS_FS)	+= reiserfs/
-obj-$(CONFIG_EXT3_FS)		+= ext3/ # Before ext2 so root fs can be ext3
 obj-$(CONFIG_EXT2_FS)		+= ext2/
 # We place ext4 after ext2 so plain ext2 root fs's are mounted using ext2
 # unless explicitly requested by rootfstype
 obj-$(CONFIG_EXT4_FS)		+= ext4/
-obj-$(CONFIG_JBD)		+= jbd/
 obj-$(CONFIG_JBD2)		+= jbd2/
 obj-$(CONFIG_CRAMFS)		+= cramfs/
 obj-$(CONFIG_SQUASHFS)		+= squashfs/

fs/ext2/ialloc.c

@@ -577,7 +577,10 @@ struct inode *ext2_new_inode(struct inode *dir, umode_t mode,
 		goto fail;
 	}
 
-	dquot_initialize(inode);
+	err = dquot_initialize(inode);
+	if (err)
+		goto fail_drop;
+
 	err = dquot_alloc_inode(inode);
 	if (err)
 		goto fail_drop;

fs/ext2/inode.c

@@ -1552,8 +1552,11 @@ int ext2_setattr(struct dentry *dentry, struct iattr *iattr)
 	if (error)
 		return error;
 
-	if (is_quota_modification(inode, iattr))
-		dquot_initialize(inode);
+	if (is_quota_modification(inode, iattr)) {
+		error = dquot_initialize(inode);
+		if (error)
+			return error;
+	}
 	if ((iattr->ia_valid & ATTR_UID && !uid_eq(iattr->ia_uid, inode->i_uid)) ||
 	    (iattr->ia_valid & ATTR_GID && !gid_eq(iattr->ia_gid, inode->i_gid))) {
 		error = dquot_transfer(inode, iattr);

fs/ext2/namei.c

@@ -96,8 +96,11 @@ struct dentry *ext2_get_parent(struct dentry *child)
 static int ext2_create (struct inode * dir, struct dentry * dentry, umode_t mode, bool excl)
 {
 	struct inode *inode;
+	int err;
 
-	dquot_initialize(dir);
+	err = dquot_initialize(dir);
+	if (err)
+		return err;
 
 	inode = ext2_new_inode(dir, mode, &dentry->d_name);
 	if (IS_ERR(inode))
@@ -143,7 +146,9 @@ static int ext2_mknod (struct inode * dir, struct dentry *dentry, umode_t mode,
 	if (!new_valid_dev(rdev))
 		return -EINVAL;
 
-	dquot_initialize(dir);
+	err = dquot_initialize(dir);
+	if (err)
+		return err;
 
 	inode = ext2_new_inode (dir, mode, &dentry->d_name);
 	err = PTR_ERR(inode);
@@ -169,7 +174,9 @@ static int ext2_symlink (struct inode * dir, struct dentry * dentry,
 	if (l > sb->s_blocksize)
 		goto out;
 
-	dquot_initialize(dir);
+	err = dquot_initialize(dir);
+	if (err)
+		goto out;
 
 	inode = ext2_new_inode (dir, S_IFLNK | S_IRWXUGO, &dentry->d_name);
 	err = PTR_ERR(inode);
@@ -212,7 +219,9 @@ static int ext2_link (struct dentry * old_dentry, struct inode * dir,
 	struct inode *inode = d_inode(old_dentry);
 	int err;
 
-	dquot_initialize(dir);
+	err = dquot_initialize(dir);
+	if (err)
+		return err;
 
 	inode->i_ctime = CURRENT_TIME_SEC;
 	inode_inc_link_count(inode);
@@ -233,7 +242,9 @@ static int ext2_mkdir(struct inode * dir, struct dentry * dentry, umode_t mode)
 	struct inode * inode;
 	int err;
 
-	dquot_initialize(dir);
+	err = dquot_initialize(dir);
+	if (err)
+		return err;
 
 	inode_inc_link_count(dir);
 
@@ -279,13 +290,17 @@ static int ext2_unlink(struct inode * dir, struct dentry *dentry)
 	struct inode * inode = d_inode(dentry);
 	struct ext2_dir_entry_2 * de;
 	struct page * page;
-	int err = -ENOENT;
+	int err;
 
-	dquot_initialize(dir);
+	err = dquot_initialize(dir);
+	if (err)
+		goto out;
 
 	de = ext2_find_entry (dir, &dentry->d_name, &page);
-	if (!de)
+	if (!de) {
+		err = -ENOENT;
 		goto out;
+	}
 
 	err = ext2_delete_entry (de, page);
 	if (err)
@@ -323,14 +338,21 @@ static int ext2_rename (struct inode * old_dir, struct dentry * old_dentry,
 	struct ext2_dir_entry_2 * dir_de = NULL;
 	struct page * old_page;
 	struct ext2_dir_entry_2 * old_de;
-	int err = -ENOENT;
+	int err;
+
+	err = dquot_initialize(old_dir);
+	if (err)
+		goto out;
 
-	dquot_initialize(old_dir);
-	dquot_initialize(new_dir);
+	err = dquot_initialize(new_dir);
+	if (err)
+		goto out;
 
 	old_de = ext2_find_entry (old_dir, &old_dentry->d_name, &old_page);
-	if (!old_de)
+	if (!old_de) {
+		err = -ENOENT;
 		goto out;
+	}
 
 	if (S_ISDIR(old_inode->i_mode)) {
 		err = -EIO;

fs/ext3/Kconfig

-config EXT3_FS
-	tristate "Ext3 journalling file system support"
-	select JBD
-	help
-	  This is the journalling version of the Second extended file system
-	  (often called ext3), the de facto standard Linux file system
-	  (method to organize files on a storage device) for hard disks.
-
-	  The journalling code included in this driver means you do not have
-	  to run e2fsck (file system checker) on your file systems after a
-	  crash.  The journal keeps track of any changes that were being made
-	  at the time the system crashed, and can ensure that your file system
-	  is consistent without the need for a lengthy check.
-
-	  Other than adding the journal to the file system, the on-disk format
-	  of ext3 is identical to ext2.  It is possible to freely switch
-	  between using the ext3 driver and the ext2 driver, as long as the
-	  file system has been cleanly unmounted, or e2fsck is run on the file
-	  system.
-
-	  To add a journal on an existing ext2 file system or change the
-	  behavior of ext3 file systems, you can use the tune2fs utility ("man
-	  tune2fs").  To modify attributes of files and directories on ext3
-	  file systems, use chattr ("man chattr").  You need to be using
-	  e2fsprogs version 1.20 or later in order to create ext3 journals
-	  (available at <http://sourceforge.net/projects/e2fsprogs/>).
-
-	  To compile this file system support as a module, choose M here: the
-	  module will be called ext3.
-
-config EXT3_DEFAULTS_TO_ORDERED
-	bool "Default to 'data=ordered' in ext3"
-	depends on EXT3_FS
-	default y
-	help
-	  The journal mode options for ext3 have different tradeoffs
-	  between when data is guaranteed to be on disk and
-	  performance.	The use of "data=writeback" can cause
-	  unwritten data to appear in files after an system crash or
-	  power failure, which can be a security issue.	 However,
-	  "data=ordered" mode can also result in major performance
-	  problems, including seconds-long delays before an fsync()
-	  call returns.	 For details, see:
-
-	  http://ext4.wiki.kernel.org/index.php/Ext3_data_mode_tradeoffs
-
-	  If you have been historically happy with ext3's performance,
-	  data=ordered mode will be a safe choice and you should
-	  answer 'y' here.  If you understand the reliability and data
-	  privacy issues of data=writeback and are willing to make
-	  that trade off, answer 'n'.
-
-config EXT3_FS_XATTR
-	bool "Ext3 extended attributes"
-	depends on EXT3_FS
-	default y
-	help
-	  Extended attributes are name:value pairs associated with inodes by
-	  the kernel or by users (see the attr(5) manual page, or visit
-	  <http://acl.bestbits.at/> for details).
-
-	  If unsure, say N.
-
-	  You need this for POSIX ACL support on ext3.
-
-config EXT3_FS_POSIX_ACL
-	bool "Ext3 POSIX Access Control Lists"
-	depends on EXT3_FS_XATTR
-	select FS_POSIX_ACL
-	help
-	  Posix Access Control Lists (ACLs) support permissions for users and
-	  groups beyond the owner/group/world scheme.
-
-	  To learn more about Access Control Lists, visit the Posix ACLs for
-	  Linux website <http://acl.bestbits.at/>.
-
-	  If you don't know what Access Control Lists are, say N
-
-config EXT3_FS_SECURITY
-	bool "Ext3 Security Labels"
-	depends on EXT3_FS_XATTR
-	help
-	  Security labels support alternative access control models
-	  implemented by security modules like SELinux.  This option
-	  enables an extended attribute handler for file security
-	  labels in the ext3 filesystem.
-
-	  If you are not using a security module that requires using
-	  extended attributes for file security labels, say N.

fs/ext3/Makefile

-#
-# Makefile for the linux ext3-filesystem routines.
-#
-
-obj-$(CONFIG_EXT3_FS) += ext3.o
-
-ext3-y	:= balloc.o bitmap.o dir.o file.o fsync.o ialloc.o inode.o \
-	   ioctl.o namei.o super.o symlink.o hash.o resize.o ext3_jbd.o
-
-ext3-$(CONFIG_EXT3_FS_XATTR)	 += xattr.o xattr_user.o xattr_trusted.o
-ext3-$(CONFIG_EXT3_FS_POSIX_ACL) += acl.o
-ext3-$(CONFIG_EXT3_FS_SECURITY)	 += xattr_security.o

fs/ext3/acl.c

-/*
- * linux/fs/ext3/acl.c
- *
- * Copyright (C) 2001-2003 Andreas Gruenbacher, <agruen@suse.de>
- */
-
-#include "ext3.h"
-#include "xattr.h"
-#include "acl.h"
-
-/*
- * Convert from filesystem to in-memory representation.
- */
-static struct posix_acl *
-ext3_acl_from_disk(const void *value, size_t size)
-{
-	const char *end = (char *)value + size;
-	int n, count;
-	struct posix_acl *acl;
-
-	if (!value)
-		return NULL;
-	if (size < sizeof(ext3_acl_header))
-		 return ERR_PTR(-EINVAL);
-	if (((ext3_acl_header *)value)->a_version !=
-	    cpu_to_le32(EXT3_ACL_VERSION))
-		return ERR_PTR(-EINVAL);
-	value = (char *)value + sizeof(ext3_acl_header);
-	count = ext3_acl_count(size);
-	if (count < 0)
-		return ERR_PTR(-EINVAL);
-	if (count == 0)
-		return NULL;
-	acl = posix_acl_alloc(count, GFP_NOFS);
-	if (!acl)
-		return ERR_PTR(-ENOMEM);
-	for (n=0; n < count; n++) {
-		ext3_acl_entry *entry =
-			(ext3_acl_entry *)value;
-		if ((char *)value + sizeof(ext3_acl_entry_short) > end)
-			goto fail;
-		acl->a_entries[n].e_tag  = le16_to_cpu(entry->e_tag);
-		acl->a_entries[n].e_perm = le16_to_cpu(entry->e_perm);
-		switch(acl->a_entries[n].e_tag) {
-			case ACL_USER_OBJ:
-			case ACL_GROUP_OBJ:
-			case ACL_MASK:
-			case ACL_OTHER:
-				value = (char *)value +
-					sizeof(ext3_acl_entry_short);
-				break;
-
-			case ACL_USER:
-				value = (char *)value + sizeof(ext3_acl_entry);
-				if ((char *)value > end)
-					goto fail;
-				acl->a_entries[n].e_uid =
-					make_kuid(&init_user_ns,
-						  le32_to_cpu(entry->e_id));
-				break;
-			case ACL_GROUP:
-				value = (char *)value + sizeof(ext3_acl_entry);
-				if ((char *)value > end)
-					goto fail;
-				acl->a_entries[n].e_gid =
-					make_kgid(&init_user_ns,
-						  le32_to_cpu(entry->e_id));
-				break;
-
-			default:
-				goto fail;
-		}
-	}
-	if (value != end)
-		goto fail;
-	return acl;
-
-fail:
-	posix_acl_release(acl);
-	return ERR_PTR(-EINVAL);
-}
-
-/*
- * Convert from in-memory to filesystem representation.
- */
-static void *
-ext3_acl_to_disk(const struct posix_acl *acl, size_t *size)
-{
-	ext3_acl_header *ext_acl;
-	char *e;
-	size_t n;
-
-	*size = ext3_acl_size(acl->a_count);
-	ext_acl = kmalloc(sizeof(ext3_acl_header) + acl->a_count *
-			sizeof(ext3_acl_entry), GFP_NOFS);
-	if (!ext_acl)
-		return ERR_PTR(-ENOMEM);
-	ext_acl->a_version = cpu_to_le32(EXT3_ACL_VERSION);
-	e = (char *)ext_acl + sizeof(ext3_acl_header);
-	for (n=0; n < acl->a_count; n++) {
-		const struct posix_acl_entry *acl_e = &acl->a_entries[n];
-		ext3_acl_entry *entry = (ext3_acl_entry *)e;
-		entry->e_tag  = cpu_to_le16(acl_e->e_tag);
-		entry->e_perm = cpu_to_le16(acl_e->e_perm);
-		switch(acl_e->e_tag) {
-			case ACL_USER:
-				entry->e_id = cpu_to_le32(
-					from_kuid(&init_user_ns, acl_e->e_uid));
-				e += sizeof(ext3_acl_entry);
-				break;
-			case ACL_GROUP:
-				entry->e_id = cpu_to_le32(
-					from_kgid(&init_user_ns, acl_e->e_gid));
-				e += sizeof(ext3_acl_entry);
-				break;
-
-			case ACL_USER_OBJ:
-			case ACL_GROUP_OBJ:
-			case ACL_MASK:
-			case ACL_OTHER:
-				e += sizeof(ext3_acl_entry_short);
-				break;
-
-			default:
-				goto fail;
-		}
-	}
-	return (char *)ext_acl;
-
-fail:
-	kfree(ext_acl);
-	return ERR_PTR(-EINVAL);
-}
-
-/*
- * Inode operation get_posix_acl().
- *
- * inode->i_mutex: don't care
- */
-struct posix_acl *
-ext3_get_acl(struct inode *inode, int type)
-{
-	int name_index;
-	char *value = NULL;
-	struct posix_acl *acl;
-	int retval;
-
-	switch (type) {
-	case ACL_TYPE_ACCESS:
-		name_index = EXT3_XATTR_INDEX_POSIX_ACL_ACCESS;
-		break;
-	case ACL_TYPE_DEFAULT:
-		name_index = EXT3_XATTR_INDEX_POSIX_ACL_DEFAULT;
-		break;
-	default:
-		BUG();
-	}
-
-	retval = ext3_xattr_get(inode, name_index, "", NULL, 0);
-	if (retval > 0) {
-		value = kmalloc(retval, GFP_NOFS);
-		if (!value)
-			return ERR_PTR(-ENOMEM);
-		retval = ext3_xattr_get(inode, name_index, "", value, retval);
-	}
-	if (retval > 0)
-		acl = ext3_acl_from_disk(value, retval);
-	else if (retval == -ENODATA || retval == -ENOSYS)
-		acl = NULL;
-	else
-		acl = ERR_PTR(retval);
-	kfree(value);
-
-	if (!IS_ERR(acl))
-		set_cached_acl(inode, type, acl);
-
-	return acl;
-}
-
-/*
- * Set the access or default ACL of an inode.
- *
- * inode->i_mutex: down unless called from ext3_new_inode
- */
-static int
-__ext3_set_acl(handle_t *handle, struct inode *inode, int type,
-	     struct posix_acl *acl)
-{
-	int name_index;
-	void *value = NULL;
-	size_t size = 0;
-	int error;
-
-	switch(type) {
-		case ACL_TYPE_ACCESS:
-			name_index = EXT3_XATTR_INDEX_POSIX_ACL_ACCESS;
-			if (acl) {
-				error = posix_acl_equiv_mode(acl, &inode->i_mode);
-				if (error < 0)
-					return error;
-				else {
-					inode->i_ctime = CURRENT_TIME_SEC;
-					ext3_mark_inode_dirty(handle, inode);
-					if (error == 0)
-						acl = NULL;
-				}
-			}
-			break;
-
-		case ACL_TYPE_DEFAULT:
-			name_index = EXT3_XATTR_INDEX_POSIX_ACL_DEFAULT;
-			if (!S_ISDIR(inode->i_mode))
-				return acl ? -EACCES : 0;
-			break;
-
-		default:
-			return -EINVAL;
-	}
-	if (acl) {
-		value = ext3_acl_to_disk(acl, &size);
-		if (IS_ERR(value))
-			return (int)PTR_ERR(value);
-	}
-
-	error = ext3_xattr_set_handle(handle, inode, name_index, "",
-				      value, size, 0);
-
-	kfree(value);
-
-	if (!error)
-		set_cached_acl(inode, type, acl);
-
-	return error;
-}
-
-int
-ext3_set_acl(struct inode *inode, struct posix_acl *acl, int type)
-{
-	handle_t *handle;
-	int error, retries = 0;
-
-retry:
-	handle = ext3_journal_start(inode, EXT3_DATA_TRANS_BLOCKS(inode->i_sb));
-	if (IS_ERR(handle))
-		return PTR_ERR(handle);
-	error = __ext3_set_acl(handle, inode, type, acl);
-	ext3_journal_stop(handle);
-	if (error == -ENOSPC && ext3_should_retry_alloc(inode->i_sb, &retries))
-		goto retry;
-	return error;
-}
-
-/*
- * Initialize the ACLs of a new inode. Called from ext3_new_inode.
- *
- * dir->i_mutex: down
- * inode->i_mutex: up (access to inode is still exclusive)
- */
-int
-ext3_init_acl(handle_t *handle, struct inode *inode, struct inode *dir)
-{
-	struct posix_acl *default_acl, *acl;
-	int error;
-
-	error = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl);
-	if (error)
-		return error;
-
-	if (default_acl) {
-		error = __ext3_set_acl(handle, inode, ACL_TYPE_DEFAULT,
-				       default_acl);
-		posix_acl_release(default_acl);
-	}
-	if (acl) {
-		if (!error)
-			error = __ext3_set_acl(handle, inode, ACL_TYPE_ACCESS,
-					       acl);
-		posix_acl_release(acl);
-	}
-	return error;
-}

fs/ext3/acl.h

-/*
-  File: fs/ext3/acl.h
-
-  (C) 2001 Andreas Gruenbacher, <a.gruenbacher@computer.org>
-*/
-
-#include <linux/posix_acl_xattr.h>
-
-#define EXT3_ACL_VERSION	0x0001
-
-typedef struct {
-	__le16		e_tag;
-	__le16		e_perm;
-	__le32		e_id;
-} ext3_acl_entry;
-
-typedef struct {
-	__le16		e_tag;
-	__le16		e_perm;
-} ext3_acl_entry_short;
-
-typedef struct {
-	__le32		a_version;
-} ext3_acl_header;
-
-static inline size_t ext3_acl_size(int count)
-{
-	if (count <= 4) {
-		return sizeof(ext3_acl_header) +
-		       count * sizeof(ext3_acl_entry_short);
-	} else {
-		return sizeof(ext3_acl_header) +
-		       4 * sizeof(ext3_acl_entry_short) +
-		       (count - 4) * sizeof(ext3_acl_entry);
-	}
-}
-
-static inline int ext3_acl_count(size_t size)
-{
-	ssize_t s;
-	size -= sizeof(ext3_acl_header);
-	s = size - 4 * sizeof(ext3_acl_entry_short);
-	if (s < 0) {
-		if (size % sizeof(ext3_acl_entry_short))
-			return -1;
-		return size / sizeof(ext3_acl_entry_short);
-	} else {
-		if (s % sizeof(ext3_acl_entry))
-			return -1;
-		return s / sizeof(ext3_acl_entry) + 4;
-	}
-}
-
-#ifdef CONFIG_EXT3_FS_POSIX_ACL
-
-/* acl.c */
-extern struct posix_acl *ext3_get_acl(struct inode *inode, int type);
-extern int ext3_set_acl(struct inode *inode, struct posix_acl *acl, int type);
-extern int ext3_init_acl (handle_t *, struct inode *, struct inode *);
-
-#else  /* CONFIG_EXT3_FS_POSIX_ACL */
-#include <linux/sched.h>
-#define ext3_get_acl NULL
-#define ext3_set_acl NULL
-
-static inline int
-ext3_init_acl(handle_t *handle, struct inode *inode, struct inode *dir)
-{
-	return 0;
-}
-#endif  /* CONFIG_EXT3_FS_POSIX_ACL */
-

fs/ext3/bitmap.c

-/*
- *  linux/fs/ext3/bitmap.c
- *
- * Copyright (C) 1992, 1993, 1994, 1995
- * Remy Card (card@masi.ibp.fr)
- * Laboratoire MASI - Institut Blaise Pascal
- * Universite Pierre et Marie Curie (Paris VI)
- */
-
-#include "ext3.h"
-
-#ifdef EXT3FS_DEBUG
-
-unsigned long ext3_count_free (struct buffer_head * map, unsigned int numchars)
-{
-	return numchars * BITS_PER_BYTE - memweight(map->b_data, numchars);
-}
-
-#endif  /*  EXT3FS_DEBUG  */
-

fs/ext3/ext3_jbd.c

-/*
- * Interface between ext3 and JBD
- */
-
-#include "ext3.h"
-
-int __ext3_journal_get_undo_access(const char *where, handle_t *handle,
-				struct buffer_head *bh)
-{
-	int err = journal_get_undo_access(handle, bh);
-	if (err)
-		ext3_journal_abort_handle(where, __func__, bh, handle,err);
-	return err;
-}
-
-int __ext3_journal_get_write_access(const char *where, handle_t *handle,
-				struct buffer_head *bh)
-{
-	int err = journal_get_write_access(handle, bh);
-	if (err)
-		ext3_journal_abort_handle(where, __func__, bh, handle,err);
-	return err;
-}
-
-int __ext3_journal_forget(const char *where, handle_t *handle,
-				struct buffer_head *bh)
-{
-	int err = journal_forget(handle, bh);
-	if (err)
-		ext3_journal_abort_handle(where, __func__, bh, handle,err);
-	return err;
-}
-
-int __ext3_journal_revoke(const char *where, handle_t *handle,
-				unsigned long blocknr, struct buffer_head *bh)
-{
-	int err = journal_revoke(handle, blocknr, bh);
-	if (err)
-		ext3_journal_abort_handle(where, __func__, bh, handle,err);
-	return err;
-}
-
-int __ext3_journal_get_create_access(const char *where,
-				handle_t *handle, struct buffer_head *bh)
-{
-	int err = journal_get_create_access(handle, bh);
-	if (err)
-		ext3_journal_abort_handle(where, __func__, bh, handle,err);
-	return err;
-}
-
-int __ext3_journal_dirty_metadata(const char *where,
-				handle_t *handle, struct buffer_head *bh)
-{
-	int err = journal_dirty_metadata(handle, bh);
-	if (err)
-		ext3_journal_abort_handle(where, __func__, bh, handle,err);
-	return err;
-}

fs/ext3/file.c

-/*
- *  linux/fs/ext3/file.c
- *
- * Copyright (C) 1992, 1993, 1994, 1995
- * Remy Card (card@masi.ibp.fr)
- * Laboratoire MASI - Institut Blaise Pascal
- * Universite Pierre et Marie Curie (Paris VI)
- *
- *  from
- *
- *  linux/fs/minix/file.c
- *
- *  Copyright (C) 1991, 1992  Linus Torvalds
- *
- *  ext3 fs regular file handling primitives
- *
- *  64-bit file support on 64-bit platforms by Jakub Jelinek
- *	(jj@sunsite.ms.mff.cuni.cz)
- */
-
-#include <linux/quotaops.h>
-#include "ext3.h"
-#include "xattr.h"
-#include "acl.h"
-
-/*
- * Called when an inode is released. Note that this is different
- * from ext3_file_open: open gets called at every open, but release
- * gets called only when /all/ the files are closed.
- */
-static int ext3_release_file (struct inode * inode, struct file * filp)
-{
-	if (ext3_test_inode_state(inode, EXT3_STATE_FLUSH_ON_CLOSE)) {
-		filemap_flush(inode->i_mapping);
-		ext3_clear_inode_state(inode, EXT3_STATE_FLUSH_ON_CLOSE);
-	}
-	/* if we are the last writer on the inode, drop the block reservation */
-	if ((filp->f_mode & FMODE_WRITE) &&
-			(atomic_read(&inode->i_writecount) == 1))
-	{
-		mutex_lock(&EXT3_I(inode)->truncate_mutex);
-		ext3_discard_reservation(inode);
-		mutex_unlock(&EXT3_I(inode)->truncate_mutex);
-	}
-	if (is_dx(inode) && filp->private_data)
-		ext3_htree_free_dir_info(filp->private_data);
-
-	return 0;
-}
-
-const struct file_operations ext3_file_operations = {
-	.llseek		= generic_file_llseek,
-	.read_iter	= generic_file_read_iter,
-	.write_iter	= generic_file_write_iter,
-	.unlocked_ioctl	= ext3_ioctl,
-#ifdef CONFIG_COMPAT
-	.compat_ioctl	= ext3_compat_ioctl,
-#endif
-	.mmap		= generic_file_mmap,
-	.open		= dquot_file_open,
-	.release	= ext3_release_file,
-	.fsync		= ext3_sync_file,
-	.splice_read	= generic_file_splice_read,
-	.splice_write	= iter_file_splice_write,
-};
-
-const struct inode_operations ext3_file_inode_operations = {
-	.setattr	= ext3_setattr,
-#ifdef CONFIG_EXT3_FS_XATTR
-	.setxattr	= generic_setxattr,
-	.getxattr	= generic_getxattr,
-	.listxattr	= ext3_listxattr,
-	.removexattr	= generic_removexattr,
-#endif
-	.get_acl	= ext3_get_acl,
-	.set_acl	= ext3_set_acl,
-	.fiemap		= ext3_fiemap,
-};
-

fs/ext3/fsync.c

-/*
- *  linux/fs/ext3/fsync.c
- *
- *  Copyright (C) 1993  Stephen Tweedie (sct@redhat.com)
- *  from
- *  Copyright (C) 1992  Remy Card (card@masi.ibp.fr)
- *                      Laboratoire MASI - Institut Blaise Pascal
- *                      Universite Pierre et Marie Curie (Paris VI)
- *  from
- *  linux/fs/minix/truncate.c   Copyright (C) 1991, 1992  Linus Torvalds
- *
- *  ext3fs fsync primitive
- *
- *  Big-endian to little-endian byte-swapping/bitmaps by
- *        David S. Miller (davem@caip.rutgers.edu), 1995
- *
- *  Removed unnecessary code duplication for little endian machines
- *  and excessive __inline__s.
- *        Andi Kleen, 1997
- *
- * Major simplications and cleanup - we only need to do the metadata, because
- * we can depend on generic_block_fdatasync() to sync the data blocks.
- */
-
-#include <linux/blkdev.h>
-#include <linux/writeback.h>
-#include "ext3.h"
-
-/*
- * akpm: A new design for ext3_sync_file().
- *
- * This is only called from sys_fsync(), sys_fdatasync() and sys_msync().
- * There cannot be a transaction open by this task.
- * Another task could have dirtied this inode.  Its data can be in any
- * state in the journalling system.
- *
- * What we do is just kick off a commit and wait on it.  This will snapshot the
- * inode to disk.
- */
-
-int ext3_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
-{
-	struct inode *inode = file->f_mapping->host;
-	struct ext3_inode_info *ei = EXT3_I(inode);
-	journal_t *journal = EXT3_SB(inode->i_sb)->s_journal;
-	int ret, needs_barrier = 0;
-	tid_t commit_tid;
-
-	trace_ext3_sync_file_enter(file, datasync);
-
-	if (inode->i_sb->s_flags & MS_RDONLY) {
-		/* Make sure that we read updated state */
-		smp_rmb();
-		if (EXT3_SB(inode->i_sb)->s_mount_state & EXT3_ERROR_FS)
-			return -EROFS;
-		return 0;
-	}
-	ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
-	if (ret)
-		goto out;
-
-	J_ASSERT(ext3_journal_current_handle() == NULL);
-
-	/*
-	 * data=writeback,ordered:
-	 *  The caller's filemap_fdatawrite()/wait will sync the data.
-	 *  Metadata is in the journal, we wait for a proper transaction
-	 *  to commit here.
-	 *
-	 * data=journal:
-	 *  filemap_fdatawrite won't do anything (the buffers are clean).
-	 *  ext3_force_commit will write the file data into the journal and
-	 *  will wait on that.
-	 *  filemap_fdatawait() will encounter a ton of newly-dirtied pages
-	 *  (they were dirtied by commit).  But that's OK - the blocks are
-	 *  safe in-journal, which is all fsync() needs to ensure.
-	 */
-	if (ext3_should_journal_data(inode)) {
-		ret = ext3_force_commit(inode->i_sb);
-		goto out;
-	}
-
-	if (datasync)
-		commit_tid = atomic_read(&ei->i_datasync_tid);
-	else
-		commit_tid = atomic_read(&ei->i_sync_tid);
-
-	if (test_opt(inode->i_sb, BARRIER) &&
-	    !journal_trans_will_send_data_barrier(journal, commit_tid))
-		needs_barrier = 1;
-	log_start_commit(journal, commit_tid);
-	ret = log_wait_commit(journal, commit_tid);
-
-	/*
-	 * In case we didn't commit a transaction, we have to flush
-	 * disk caches manually so that data really is on persistent
-	 * storage
-	 */
-	if (needs_barrier) {
-		int err;
-
-		err = blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL, NULL);
-		if (!ret)
-			ret = err;
-	}
-out:
-	trace_ext3_sync_file_exit(inode, ret);
-	return ret;
-}

fs/ext3/hash.c

-/*
- *  linux/fs/ext3/hash.c
- *
- * Copyright (C) 2002 by Theodore Ts'o
- *
- * This file is released under the GPL v2.
- *
- * This file may be redistributed under the terms of the GNU Public
- * License.
- */
-
-#include "ext3.h"
-#include <linux/cryptohash.h>
-
-#define DELTA 0x9E3779B9
-
-static void TEA_transform(__u32 buf[4], __u32 const in[])
-{
-	__u32	sum = 0;
-	__u32	b0 = buf[0], b1 = buf[1];
-	__u32	a = in[0], b = in[1], c = in[2], d = in[3];
-	int	n = 16;
-
-	do {
-		sum += DELTA;
-		b0 += ((b1 << 4)+a) ^ (b1+sum) ^ ((b1 >> 5)+b);
-		b1 += ((b0 << 4)+c) ^ (b0+sum) ^ ((b0 >> 5)+d);
-	} while(--n);
-
-	buf[0] += b0;
-	buf[1] += b1;
-}
-
-
-/* The old legacy hash */
-static __u32 dx_hack_hash_unsigned(const char *name, int len)
-{
-	__u32 hash, hash0 = 0x12a3fe2d, hash1 = 0x37abe8f9;
-	const unsigned char *ucp = (const unsigned char *) name;
-
-	while (len--) {
-		hash = hash1 + (hash0 ^ (((int) *ucp++) * 7152373));
-
-		if (hash & 0x80000000)
-			hash -= 0x7fffffff;
-		hash1 = hash0;
-		hash0 = hash;
-	}
-	return hash0 << 1;
-}
-
-static __u32 dx_hack_hash_signed(const char *name, int len)
-{
-	__u32 hash, hash0 = 0x12a3fe2d, hash1 = 0x37abe8f9;
-	const signed char *scp = (const signed char *) name;
-
-	while (len--) {
-		hash = hash1 + (hash0 ^ (((int) *scp++) * 7152373));
-
-		if (hash & 0x80000000)
-			hash -= 0x7fffffff;
-		hash1 = hash0;
-		hash0 = hash;
-	}
-	return hash0 << 1;
-}
-
-static void str2hashbuf_signed(const char *msg, int len, __u32 *buf, int num)
-{
-	__u32	pad, val;
-	int	i;
-	const signed char *scp = (const signed char *) msg;
-
-	pad = (__u32)len | ((__u32)len << 8);
-	pad |= pad << 16;
-
-	val = pad;
-	if (len > num*4)
-		len = num * 4;
-	for (i = 0; i < len; i++) {
-		if ((i % 4) == 0)
-			val = pad;
-		val = ((int) scp[i]) + (val << 8);
-		if ((i % 4) == 3) {
-			*buf++ = val;
-			val = pad;
-			num--;
-		}
-	}
-	if (--num >= 0)
-		*buf++ = val;
-	while (--num >= 0)
-		*buf++ = pad;
-}
-
-static void str2hashbuf_unsigned(const char *msg, int len, __u32 *buf, int num)
-{
-	__u32	pad, val;
-	int	i;
-	const unsigned char *ucp = (const unsigned char *) msg;
-
-	pad = (__u32)len | ((__u32)len << 8);
-	pad |= pad << 16;
-
-	val = pad;
-	if (len > num*4)
-		len = num * 4;
-	for (i=0; i < len; i++) {
-		if ((i % 4) == 0)
-			val = pad;
-		val = ((int) ucp[i]) + (val << 8);
-		if ((i % 4) == 3) {
-			*buf++ = val;
-			val = pad;
-			num--;
-		}
-	}
-	if (--num >= 0)
-		*buf++ = val;
-	while (--num >= 0)
-		*buf++ = pad;
-}
-
-/*
- * Returns the hash of a filename.  If len is 0 and name is NULL, then
- * this function can be used to test whether or not a hash version is
- * supported.
- *
- * The seed is an 4 longword (32 bits) "secret" which can be used to
- * uniquify a hash.  If the seed is all zero's, then some default seed
- * may be used.
- *
- * A particular hash version specifies whether or not the seed is
- * represented, and whether or not the returned hash is 32 bits or 64
- * bits.  32 bit hashes will return 0 for the minor hash.
- */
-int ext3fs_dirhash(const char *name, int len, struct dx_hash_info *hinfo)
-{
-	__u32	hash;
-	__u32	minor_hash = 0;
-	const char	*p;
-	int		i;
-	__u32		in[8], buf[4];
-	void		(*str2hashbuf)(const char *, int, __u32 *, int) =
-				str2hashbuf_signed;
-
-	/* Initialize the default seed for the hash checksum functions */
-	buf[0] = 0x67452301;
-	buf[1] = 0xefcdab89;
-	buf[2] = 0x98badcfe;
-	buf[3] = 0x10325476;
-
-	/* Check to see if the seed is all zero's */
-	if (hinfo->seed) {
-		for (i=0; i < 4; i++) {
-			if (hinfo->seed[i])
-				break;
-		}
-		if (i < 4)
-			memcpy(buf, hinfo->seed, sizeof(buf));
-	}
-
-	switch (hinfo->hash_version) {
-	case DX_HASH_LEGACY_UNSIGNED:
-		hash = dx_hack_hash_unsigned(name, len);
-		break;
-	case DX_HASH_LEGACY:
-		hash = dx_hack_hash_signed(name, len);
-		break;
-	case DX_HASH_HALF_MD4_UNSIGNED:
-		str2hashbuf = str2hashbuf_unsigned;
-	case DX_HASH_HALF_MD4:
-		p = name;
-		while (len > 0) {
-			(*str2hashbuf)(p, len, in, 8);
-			half_md4_transform(buf, in);
-			len -= 32;
-			p += 32;
-		}
-		minor_hash = buf[2];
-		hash = buf[1];
-		break;
-	case DX_HASH_TEA_UNSIGNED:
-		str2hashbuf = str2hashbuf_unsigned;
-	case DX_HASH_TEA:
-		p = name;
-		while (len > 0) {
-			(*str2hashbuf)(p, len, in, 4);
-			TEA_transform(buf, in);
-			len -= 16;
-			p += 16;
-		}
-		hash = buf[0];
-		minor_hash = buf[1];
-		break;
-	default:
-		hinfo->hash = 0;
-		return -1;
-	}
-	hash = hash & ~1;
-	if (hash == (EXT3_HTREE_EOF_32BIT << 1))
-		hash = (EXT3_HTREE_EOF_32BIT - 1) << 1;
-	hinfo->hash = hash;
-	hinfo->minor_hash = minor_hash;
-	return 0;
-}

fs/ext3/ioctl.c

-/*
- * linux/fs/ext3/ioctl.c
- *
- * Copyright (C) 1993, 1994, 1995
- * Remy Card (card@masi.ibp.fr)
- * Laboratoire MASI - Institut Blaise Pascal
- * Universite Pierre et Marie Curie (Paris VI)
- */
-
-#include <linux/mount.h>
-#include <linux/compat.h>
-#include <asm/uaccess.h>
-#include "ext3.h"
-
-long ext3_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
-{
-	struct inode *inode = file_inode(filp);
-	struct ext3_inode_info *ei = EXT3_I(inode);
-	unsigned int flags;
-	unsigned short rsv_window_size;
-
-	ext3_debug ("cmd = %u, arg = %lu\n", cmd, arg);
-
-	switch (cmd) {
-	case EXT3_IOC_GETFLAGS:
-		ext3_get_inode_flags(ei);
-		flags = ei->i_flags & EXT3_FL_USER_VISIBLE;
-		return put_user(flags, (int __user *) arg);
-	case EXT3_IOC_SETFLAGS: {
-		handle_t *handle = NULL;
-		int err;
-		struct ext3_iloc iloc;
-		unsigned int oldflags;
-		unsigned int jflag;
-
-		if (!inode_owner_or_capable(inode))
-			return -EACCES;
-
-		if (get_user(flags, (int __user *) arg))
-			return -EFAULT;
-
-		err = mnt_want_write_file(filp);
-		if (err)
-			return err;
-
-		flags = ext3_mask_flags(inode->i_mode, flags);
-
-		mutex_lock(&inode->i_mutex);
-
-		/* Is it quota file? Do not allow user to mess with it */
-		err = -EPERM;
-		if (IS_NOQUOTA(inode))
-			goto flags_out;
-
-		oldflags = ei->i_flags;
-
-		/* The JOURNAL_DATA flag is modifiable only by root */
-		jflag = flags & EXT3_JOURNAL_DATA_FL;
-
-		/*
-		 * The IMMUTABLE and APPEND_ONLY flags can only be changed by
-		 * the relevant capability.
-		 *
-		 * This test looks nicer. Thanks to Pauline Middelink
-		 */
-		if ((flags ^ oldflags) & (EXT3_APPEND_FL | EXT3_IMMUTABLE_FL)) {
-			if (!capable(CAP_LINUX_IMMUTABLE))
-				goto flags_out;
-		}
-
-		/*
-		 * The JOURNAL_DATA flag can only be changed by
-		 * the relevant capability.
-		 */
-		if ((jflag ^ oldflags) & (EXT3_JOURNAL_DATA_FL)) {
-			if (!capable(CAP_SYS_RESOURCE))
-				goto flags_out;
-		}
-
-		handle = ext3_journal_start(inode, 1);
-		if (IS_ERR(handle)) {
-			err = PTR_ERR(handle);
-			goto flags_out;
-		}
-		if (IS_SYNC(inode))
-			handle->h_sync = 1;
-		err = ext3_reserve_inode_write(handle, inode, &iloc);
-		if (err)
-			goto flags_err;
-
-		flags = flags & EXT3_FL_USER_MODIFIABLE;
-		flags |= oldflags & ~EXT3_FL_USER_MODIFIABLE;
-		ei->i_flags = flags;
-
-		ext3_set_inode_flags(inode);
-		inode->i_ctime = CURRENT_TIME_SEC;
-
-		err = ext3_mark_iloc_dirty(handle, inode, &iloc);
-flags_err:
-		ext3_journal_stop(handle);
-		if (err)
-			goto flags_out;
-
-		if ((jflag ^ oldflags) & (EXT3_JOURNAL_DATA_FL))
-			err = ext3_change_inode_journal_flag(inode, jflag);
-flags_out:
-		mutex_unlock(&inode->i_mutex);
-		mnt_drop_write_file(filp);
-		return err;
-	}
-	case EXT3_IOC_GETVERSION:
-	case EXT3_IOC_GETVERSION_OLD:
-		return put_user(inode->i_generation, (int __user *) arg);
-	case EXT3_IOC_SETVERSION:
-	case EXT3_IOC_SETVERSION_OLD: {
-		handle_t *handle;
-		struct ext3_iloc iloc;
-		__u32 generation;
-		int err;
-
-		if (!inode_owner_or_capable(inode))
-			return -EPERM;
-
-		err = mnt_want_write_file(filp);
-		if (err)
-			return err;
-		if (get_user(generation, (int __user *) arg)) {
-			err = -EFAULT;
-			goto setversion_out;
-		}
-
-		mutex_lock(&inode->i_mutex);
-		handle = ext3_journal_start(inode, 1);
-		if (IS_ERR(handle)) {
-			err = PTR_ERR(handle);
-			goto unlock_out;
-		}
-		err = ext3_reserve_inode_write(handle, inode, &iloc);
-		if (err == 0) {
-			inode->i_ctime = CURRENT_TIME_SEC;
-			inode->i_generation = generation;
-			err = ext3_mark_iloc_dirty(handle, inode, &iloc);
-		}
-		ext3_journal_stop(handle);
-
-unlock_out:
-		mutex_unlock(&inode->i_mutex);
-setversion_out:
-		mnt_drop_write_file(filp);
-		return err;
-	}
-	case EXT3_IOC_GETRSVSZ:
-		if (test_opt(inode->i_sb, RESERVATION)
-			&& S_ISREG(inode->i_mode)
-			&& ei->i_block_alloc_info) {
-			rsv_window_size = ei->i_block_alloc_info->rsv_window_node.rsv_goal_size;
-			return put_user(rsv_window_size, (int __user *)arg);
-		}
-		return -ENOTTY;
-	case EXT3_IOC_SETRSVSZ: {
-		int err;
-
-		if (!test_opt(inode->i_sb, RESERVATION) ||!S_ISREG(inode->i_mode))
-			return -ENOTTY;
-
-		err = mnt_want_write_file(filp);
-		if (err)
-			return err;
-
-		if (!inode_owner_or_capable(inode)) {
-			err = -EACCES;
-			goto setrsvsz_out;
-		}
-
-		if (get_user(rsv_window_size, (int __user *)arg)) {
-			err = -EFAULT;
-			goto setrsvsz_out;
-		}
-
-		if (rsv_window_size > EXT3_MAX_RESERVE_BLOCKS)
-			rsv_window_size = EXT3_MAX_RESERVE_BLOCKS;
-
-		/*
-		 * need to allocate reservation structure for this inode
-		 * before set the window size
-		 */
-		mutex_lock(&ei->truncate_mutex);
-		if (!ei->i_block_alloc_info)
-			ext3_init_block_alloc_info(inode);
-
-		if (ei->i_block_alloc_info){
-			struct ext3_reserve_window_node *rsv = &ei->i_block_alloc_info->rsv_window_node;
-			rsv->rsv_goal_size = rsv_window_size;
-		}
-		mutex_unlock(&ei->truncate_mutex);
-setrsvsz_out:
-		mnt_drop_write_file(filp);
-		return err;
-	}
-	case EXT3_IOC_GROUP_EXTEND: {
-		ext3_fsblk_t n_blocks_count;
-		struct super_block *sb = inode->i_sb;
-		int err, err2;
-
-		if (!capable(CAP_SYS_RESOURCE))
-			return -EPERM;
-
-		err = mnt_want_write_file(filp);
-		if (err)
-			return err;
-
-		if (get_user(n_blocks_count, (__u32 __user *)arg)) {
-			err = -EFAULT;
-			goto group_extend_out;
-		}
-		err = ext3_group_extend(sb, EXT3_SB(sb)->s_es, n_blocks_count);
-		journal_lock_updates(EXT3_SB(sb)->s_journal);
-		err2 = journal_flush(EXT3_SB(sb)->s_journal);
-		journal_unlock_updates(EXT3_SB(sb)->s_journal);
-		if (err == 0)
-			err = err2;
-group_extend_out:
-		mnt_drop_write_file(filp);
-		return err;
-	}
-	case EXT3_IOC_GROUP_ADD: {
-		struct ext3_new_group_data input;
-		struct super_block *sb = inode->i_sb;
-		int err, err2;
-
-		if (!capable(CAP_SYS_RESOURCE))
-			return -EPERM;
-
-		err = mnt_want_write_file(filp);
-		if (err)
-			return err;
-
-		if (copy_from_user(&input, (struct ext3_new_group_input __user *)arg,
-				sizeof(input))) {
-			err = -EFAULT;
-			goto group_add_out;
-		}
-
-		err = ext3_group_add(sb, &input);
-		journal_lock_updates(EXT3_SB(sb)->s_journal);
-		err2 = journal_flush(EXT3_SB(sb)->s_journal);
-		journal_unlock_updates(EXT3_SB(sb)->s_journal);
-		if (err == 0)
-			err = err2;
-group_add_out:
-		mnt_drop_write_file(filp);
-		return err;
-	}
-	case FITRIM: {
-
-		struct super_block *sb = inode->i_sb;
-		struct fstrim_range range;
-		int ret = 0;
-
-		if (!capable(CAP_SYS_ADMIN))
-			return -EPERM;
-
-		if (copy_from_user(&range, (struct fstrim_range __user *)arg,
-				   sizeof(range)))
-			return -EFAULT;
-
-		ret = ext3_trim_fs(sb, &range);
-		if (ret < 0)
-			return ret;
-
-		if (copy_to_user((struct fstrim_range __user *)arg, &range,
-				 sizeof(range)))
-			return -EFAULT;
-
-		return 0;
-	}
-
-	default:
-		return -ENOTTY;
-	}
-}
-
-#ifdef CONFIG_COMPAT
-long ext3_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
-{
-	/* These are just misnamed, they actually get/put from/to user an int */
-	switch (cmd) {
-	case EXT3_IOC32_GETFLAGS:
-		cmd = EXT3_IOC_GETFLAGS;
-		break;
-	case EXT3_IOC32_SETFLAGS:
-		cmd = EXT3_IOC_SETFLAGS;
-		break;
-	case EXT3_IOC32_GETVERSION:
-		cmd = EXT3_IOC_GETVERSION;
-		break;
-	case EXT3_IOC32_SETVERSION:
-		cmd = EXT3_IOC_SETVERSION;
-		break;
-	case EXT3_IOC32_GROUP_EXTEND:
-		cmd = EXT3_IOC_GROUP_EXTEND;
-		break;
-	case EXT3_IOC32_GETVERSION_OLD:
-		cmd = EXT3_IOC_GETVERSION_OLD;
-		break;
-	case EXT3_IOC32_SETVERSION_OLD:
-		cmd = EXT3_IOC_SETVERSION_OLD;
-		break;
-#ifdef CONFIG_JBD_DEBUG
-	case EXT3_IOC32_WAIT_FOR_READONLY:
-		cmd = EXT3_IOC_WAIT_FOR_READONLY;
-		break;
-#endif
-	case EXT3_IOC32_GETRSVSZ:
-		cmd = EXT3_IOC_GETRSVSZ;
-		break;
-	case EXT3_IOC32_SETRSVSZ:
-		cmd = EXT3_IOC_SETRSVSZ;
-		break;
-	case EXT3_IOC_GROUP_ADD:
-		break;
-	default:
-		return -ENOIOCTLCMD;
-	}
-	return ext3_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
-}
-#endif

fs/ext3/namei.h

-/*  linux/fs/ext3/namei.h
- *
- * Copyright (C) 2005 Simtec Electronics
- *	Ben Dooks <ben@simtec.co.uk>
- *
-*/
-
-extern struct dentry *ext3_get_parent(struct dentry *child);
-
-static inline struct buffer_head *ext3_dir_bread(handle_t *handle,
-						 struct inode *inode,
-						 int block, int create,
-						 int *err)
-{
-	struct buffer_head *bh;
-
-	bh = ext3_bread(handle, inode, block, create, err);
-
-	if (!bh && !(*err)) {
-		*err = -EIO;
-		ext3_error(inode->i_sb, __func__,
-			   "Directory hole detected on inode %lu\n",
-			   inode->i_ino);
-		return NULL;
-	}
-	return bh;
-}

fs/ext3/symlink.c

-/*
- *  linux/fs/ext3/symlink.c
- *
- * Only fast symlinks left here - the rest is done by generic code. AV, 1999
- *
- * Copyright (C) 1992, 1993, 1994, 1995
- * Remy Card (card@masi.ibp.fr)
- * Laboratoire MASI - Institut Blaise Pascal
- * Universite Pierre et Marie Curie (Paris VI)
- *
- *  from
- *
- *  linux/fs/minix/symlink.c
- *
- *  Copyright (C) 1991, 1992  Linus Torvalds
- *
- *  ext3 symlink handling code
- */
-
-#include "ext3.h"
-#include "xattr.h"
-
-const struct inode_operations ext3_symlink_inode_operations = {
-	.readlink	= generic_readlink,
-	.follow_link	= page_follow_link_light,
-	.put_link	= page_put_link,
-	.setattr	= ext3_setattr,
-#ifdef CONFIG_EXT3_FS_XATTR
-	.setxattr	= generic_setxattr,
-	.getxattr	= generic_getxattr,
-	.listxattr	= ext3_listxattr,
-	.removexattr	= generic_removexattr,
-#endif
-};
-
-const struct inode_operations ext3_fast_symlink_inode_operations = {
-	.readlink	= generic_readlink,
-	.follow_link	= simple_follow_link,
-	.setattr	= ext3_setattr,
-#ifdef CONFIG_EXT3_FS_XATTR
-	.setxattr	= generic_setxattr,
-	.getxattr	= generic_getxattr,
-	.listxattr	= ext3_listxattr,
-	.removexattr	= generic_removexattr,
-#endif
-};

fs/ext3/xattr.h

-/*
-  File: fs/ext3/xattr.h
-
-  On-disk format of extended attributes for the ext3 filesystem.
-
-  (C) 2001 Andreas Gruenbacher, <a.gruenbacher@computer.org>
-*/
-
-#include <linux/xattr.h>
-
-/* Magic value in attribute blocks */
-#define EXT3_XATTR_MAGIC		0xEA020000
-
-/* Maximum number of references to one attribute block */
-#define EXT3_XATTR_REFCOUNT_MAX		1024
-
-/* Name indexes */
-#define EXT3_XATTR_INDEX_USER			1
-#define EXT3_XATTR_INDEX_POSIX_ACL_ACCESS	2
-#define EXT3_XATTR_INDEX_POSIX_ACL_DEFAULT	3
-#define EXT3_XATTR_INDEX_TRUSTED		4
-#define	EXT3_XATTR_INDEX_LUSTRE			5
-#define EXT3_XATTR_INDEX_SECURITY	        6
-
-struct ext3_xattr_header {
-	__le32	h_magic;	/* magic number for identification */
-	__le32	h_refcount;	/* reference count */
-	__le32	h_blocks;	/* number of disk blocks used */
-	__le32	h_hash;		/* hash value of all attributes */
-	__u32	h_reserved[4];	/* zero right now */
-};
-
-struct ext3_xattr_ibody_header {
-	__le32	h_magic;	/* magic number for identification */
-};
-
-struct ext3_xattr_entry {
-	__u8	e_name_len;	/* length of name */
-	__u8	e_name_index;	/* attribute name index */
-	__le16	e_value_offs;	/* offset in disk block of value */
-	__le32	e_value_block;	/* disk block attribute is stored on (n/i) */
-	__le32	e_value_size;	/* size of attribute value */
-	__le32	e_hash;		/* hash value of name and value */
-	char	e_name[0];	/* attribute name */
-};
-
-#define EXT3_XATTR_PAD_BITS		2
-#define EXT3_XATTR_PAD		(1<<EXT3_XATTR_PAD_BITS)
-#define EXT3_XATTR_ROUND		(EXT3_XATTR_PAD-1)
-#define EXT3_XATTR_LEN(name_len) \
-	(((name_len) + EXT3_XATTR_ROUND + \
-	sizeof(struct ext3_xattr_entry)) & ~EXT3_XATTR_ROUND)
-#define EXT3_XATTR_NEXT(entry) \
-	( (struct ext3_xattr_entry *)( \
-	  (char *)(entry) + EXT3_XATTR_LEN((entry)->e_name_len)) )
-#define EXT3_XATTR_SIZE(size) \
-	(((size) + EXT3_XATTR_ROUND) & ~EXT3_XATTR_ROUND)
-
-# ifdef CONFIG_EXT3_FS_XATTR
-
-extern const struct xattr_handler ext3_xattr_user_handler;
-extern const struct xattr_handler ext3_xattr_trusted_handler;
-extern const struct xattr_handler ext3_xattr_security_handler;
-
-extern ssize_t ext3_listxattr(struct dentry *, char *, size_t);
-
-extern int ext3_xattr_get(struct inode *, int, const char *, void *, size_t);
-extern int ext3_xattr_set(struct inode *, int, const char *, const void *, size_t, int);
-extern int ext3_xattr_set_handle(handle_t *, struct inode *, int, const char *, const void *, size_t, int);
-
-extern void ext3_xattr_delete_inode(handle_t *, struct inode *);
-extern void ext3_xattr_put_super(struct super_block *);
-
-extern int init_ext3_xattr(void);
-extern void exit_ext3_xattr(void);
-
-extern const struct xattr_handler *ext3_xattr_handlers[];
-
-# else  /* CONFIG_EXT3_FS_XATTR */
-
-static inline int
-ext3_xattr_get(struct inode *inode, int name_index, const char *name,
-	       void *buffer, size_t size, int flags)
-{
-	return -EOPNOTSUPP;
-}
-
-static inline int
-ext3_xattr_set(struct inode *inode, int name_index, const char *name,
-	       const void *value, size_t size, int flags)
-{
-	return -EOPNOTSUPP;
-}
-
-static inline int
-ext3_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index,
-	       const char *name, const void *value, size_t size, int flags)
-{
-	return -EOPNOTSUPP;
-}
-
-static inline void
-ext3_xattr_delete_inode(handle_t *handle, struct inode *inode)
-{
-}
-
-static inline void
-ext3_xattr_put_super(struct super_block *sb)
-{
-}
-
-static inline int
-init_ext3_xattr(void)
-{
-	return 0;
-}
-
-static inline void
-exit_ext3_xattr(void)
-{
-}
-
-#define ext3_xattr_handlers	NULL
-
-# endif  /* CONFIG_EXT3_FS_XATTR */
-
-#ifdef CONFIG_EXT3_FS_SECURITY
-extern int ext3_init_security(handle_t *handle, struct inode *inode,
-			      struct inode *dir, const struct qstr *qstr);
-#else
-static inline int ext3_init_security(handle_t *handle, struct inode *inode,
-				     struct inode *dir, const struct qstr *qstr)
-{
-	return 0;
-}
-#endif

fs/ext3/xattr_trusted.c

-/*
- * linux/fs/ext3/xattr_trusted.c
- * Handler for trusted extended attributes.
- *
- * Copyright (C) 2003 by Andreas Gruenbacher, <a.gruenbacher@computer.org>
- */
-
-#include "ext3.h"
-#include "xattr.h"
-
-static size_t
-ext3_xattr_trusted_list(struct dentry *dentry, char *list, size_t list_size,
-		const char *name, size_t name_len, int type)
-{
-	const size_t prefix_len = XATTR_TRUSTED_PREFIX_LEN;
-	const size_t total_len = prefix_len + name_len + 1;
-
-	if (!capable(CAP_SYS_ADMIN))
-		return 0;
-
-	if (list && total_len <= list_size) {
-		memcpy(list, XATTR_TRUSTED_PREFIX, prefix_len);
-		memcpy(list+prefix_len, name, name_len);
-		list[prefix_len + name_len] = '\0';
-	}
-	return total_len;
-}
-
-static int
-ext3_xattr_trusted_get(struct dentry *dentry, const char *name,
-		       void *buffer, size_t size, int type)
-{
-	if (strcmp(name, "") == 0)
-		return -EINVAL;
-	return ext3_xattr_get(d_inode(dentry), EXT3_XATTR_INDEX_TRUSTED,
-			      name, buffer, size);
-}
-
-static int
-ext3_xattr_trusted_set(struct dentry *dentry, const char *name,
-		const void *value, size_t size, int flags, int type)
-{
-	if (strcmp(name, "") == 0)
-		return -EINVAL;
-	return ext3_xattr_set(d_inode(dentry), EXT3_XATTR_INDEX_TRUSTED, name,
-			      value, size, flags);
-}
-
-const struct xattr_handler ext3_xattr_trusted_handler = {
-	.prefix	= XATTR_TRUSTED_PREFIX,
-	.list	= ext3_xattr_trusted_list,
-	.get	= ext3_xattr_trusted_get,
-	.set	= ext3_xattr_trusted_set,
-};

fs/ext4/inode.c

@@ -4661,8 +4661,11 @@ int ext4_setattr(struct dentry *dentry, struct iattr *attr)
 	if (error)
 		return error;
 
-	if (is_quota_modification(inode, attr))
-		dquot_initialize(inode);
+	if (is_quota_modification(inode, attr)) {
+		error = dquot_initialize(inode);
+		if (error)
+			return error;
+	}
 	if ((ia_valid & ATTR_UID && !uid_eq(attr->ia_uid, inode->i_uid)) ||
 	    (ia_valid & ATTR_GID && !gid_eq(attr->ia_gid, inode->i_gid))) {
 		handle_t *handle;