[mirror_ubuntu-artful-kernel.git] / fs / ext4 / file.c

/*
 *  linux/fs/ext4/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
 *
 *  ext4 fs regular file handling primitives
 *
 *  64-bit file support on 64-bit platforms by Jakub Jelinek
 *	(jj@sunsite.ms.mff.cuni.cz)
 */

#include <linux/time.h>
#include <linux/fs.h>
#include <linux/jbd2.h>
#include <linux/mount.h>
#include <linux/path.h>
#include <linux/quotaops.h>
#include "ext4.h"
#include "ext4_jbd2.h"
#include "xattr.h"
#include "acl.h"

/*
 * Called when an inode is released. Note that this is different
 * from ext4_file_open: open gets called at every open, but release
 * gets called only when /all/ the files are closed.
 */
static int ext4_release_file(struct inode *inode, struct file *filp)
{
	if (ext4_test_inode_state(inode, EXT4_STATE_DA_ALLOC_CLOSE)) {
		ext4_alloc_da_blocks(inode);
		ext4_clear_inode_state(inode, EXT4_STATE_DA_ALLOC_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) &&
		        !EXT4_I(inode)->i_reserved_data_blocks)
	{
		down_write(&EXT4_I(inode)->i_data_sem);
		ext4_discard_preallocations(inode);
		up_write(&EXT4_I(inode)->i_data_sem);
	}
	if (is_dx(inode) && filp->private_data)
		ext4_htree_free_dir_info(filp->private_data);

	return 0;
}

static void ext4_aiodio_wait(struct inode *inode)
{
	wait_queue_head_t *wq = ext4_ioend_wq(inode);

	wait_event(*wq, (atomic_read(&EXT4_I(inode)->i_aiodio_unwritten) == 0));
}

/*
 * This tests whether the IO in question is block-aligned or not.
 * Ext4 utilizes unwritten extents when hole-filling during direct IO, and they
 * are converted to written only after the IO is complete.  Until they are
 * mapped, these blocks appear as holes, so dio_zero_block() will assume that
 * it needs to zero out portions of the start and/or end block.  If 2 AIO
 * threads are at work on the same unwritten block, they must be synchronized
 * or one thread will zero the other's data, causing corruption.
 */
static int
ext4_unaligned_aio(struct inode *inode, const struct iovec *iov,
		   unsigned long nr_segs, loff_t pos)
{
	struct super_block *sb = inode->i_sb;
	int blockmask = sb->s_blocksize - 1;
	size_t count = iov_length(iov, nr_segs);
	loff_t final_size = pos + count;

	if (pos >= inode->i_size)
		return 0;

	if ((pos & blockmask) || (final_size & blockmask))
		return 1;

	return 0;
}

static ssize_t
ext4_file_dio_write(struct kiocb *iocb, const struct iovec *iov,
		    unsigned long nr_segs, loff_t pos)
{
	struct file *file = iocb->ki_filp;
	struct inode *inode = file->f_mapping->host;
	struct blk_plug plug;
	int unaligned_aio = 0;
	ssize_t ret;
	int overwrite = 0;
	size_t length = iov_length(iov, nr_segs);

	if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS) &&
	    !is_sync_kiocb(iocb))
		unaligned_aio = ext4_unaligned_aio(inode, iov, nr_segs, pos);

	/* Unaligned direct AIO must be serialized; see comment above */
	if (unaligned_aio) {
		static unsigned long unaligned_warn_time;

		/* Warn about this once per day */
		if (printk_timed_ratelimit(&unaligned_warn_time, 60*60*24*HZ))
			ext4_msg(inode->i_sb, KERN_WARNING,
				 "Unaligned AIO/DIO on inode %ld by %s; "
				 "performance will be poor.",
				 inode->i_ino, current->comm);
		mutex_lock(ext4_aio_mutex(inode));
		ext4_aiodio_wait(inode);
	}

	BUG_ON(iocb->ki_pos != pos);

	mutex_lock(&inode->i_mutex);
	blk_start_plug(&plug);

	iocb->private = &overwrite;

	/* check whether we do a DIO overwrite or not */
	if (ext4_should_dioread_nolock(inode) && !unaligned_aio &&
	    !file->f_mapping->nrpages && pos + length <= i_size_read(inode)) {
		struct ext4_map_blocks map;
		unsigned int blkbits = inode->i_blkbits;
		int err, len;

		map.m_lblk = pos >> blkbits;
		map.m_len = (EXT4_BLOCK_ALIGN(pos + length, blkbits) >> blkbits)
			- map.m_lblk;
		len = map.m_len;

		err = ext4_map_blocks(NULL, inode, &map, 0);
		/*
		 * 'err==len' means that all of blocks has been preallocated no
		 * matter they are initialized or not.  For excluding
		 * uninitialized extents, we need to check m_flags.  There are
		 * two conditions that indicate for initialized extents.
		 * 1) If we hit extent cache, EXT4_MAP_MAPPED flag is returned;
		 * 2) If we do a real lookup, non-flags are returned.
		 * So we should check these two conditions.
		 */
		if (err == len && (map.m_flags & EXT4_MAP_MAPPED))
			overwrite = 1;
	}

	ret = __generic_file_aio_write(iocb, iov, nr_segs, &iocb->ki_pos);
	mutex_unlock(&inode->i_mutex);

	if (ret > 0 || ret == -EIOCBQUEUED) {
		ssize_t err;

		err = generic_write_sync(file, pos, ret);
		if (err < 0 && ret > 0)
			ret = err;
	}
	blk_finish_plug(&plug);

	if (unaligned_aio)
		mutex_unlock(ext4_aio_mutex(inode));

	return ret;
}

static ssize_t
ext4_file_write(struct kiocb *iocb, const struct iovec *iov,
		unsigned long nr_segs, loff_t pos)
{
	struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;
	ssize_t ret;

	/*
	 * If we have encountered a bitmap-format file, the size limit
	 * is smaller than s_maxbytes, which is for extent-mapped files.
	 */

	if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) {
		struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
		size_t length = iov_length(iov, nr_segs);

		if ((pos > sbi->s_bitmap_maxbytes ||
		    (pos == sbi->s_bitmap_maxbytes && length > 0)))
			return -EFBIG;

		if (pos + length > sbi->s_bitmap_maxbytes) {
			nr_segs = iov_shorten((struct iovec *)iov, nr_segs,
					      sbi->s_bitmap_maxbytes - pos);
		}
	}

	if (unlikely(iocb->ki_filp->f_flags & O_DIRECT))
		ret = ext4_file_dio_write(iocb, iov, nr_segs, pos);
	else
		ret = generic_file_aio_write(iocb, iov, nr_segs, pos);

	return ret;
}

static const struct vm_operations_struct ext4_file_vm_ops = {
	.fault		= filemap_fault,
	.page_mkwrite   = ext4_page_mkwrite,
};

static int ext4_file_mmap(struct file *file, struct vm_area_struct *vma)
{
	struct address_space *mapping = file->f_mapping;

	if (!mapping->a_ops->readpage)
		return -ENOEXEC;
	file_accessed(file);
	vma->vm_ops = &ext4_file_vm_ops;
	vma->vm_flags |= VM_CAN_NONLINEAR;
	return 0;
}

static int ext4_file_open(struct inode * inode, struct file * filp)
{
	struct super_block *sb = inode->i_sb;
	struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
	struct ext4_inode_info *ei = EXT4_I(inode);
	struct vfsmount *mnt = filp->f_path.mnt;
	struct path path;
	char buf[64], *cp;

	if (unlikely(!(sbi->s_mount_flags & EXT4_MF_MNTDIR_SAMPLED) &&
		     !(sb->s_flags & MS_RDONLY))) {
		sbi->s_mount_flags |= EXT4_MF_MNTDIR_SAMPLED;
		/*
		 * Sample where the filesystem has been mounted and
		 * store it in the superblock for sysadmin convenience
		 * when trying to sort through large numbers of block
		 * devices or filesystem images.
		 */
		memset(buf, 0, sizeof(buf));
		path.mnt = mnt;
		path.dentry = mnt->mnt_root;
		cp = d_path(&path, buf, sizeof(buf));
		if (!IS_ERR(cp)) {
			handle_t *handle;
			int err;

			handle = ext4_journal_start_sb(sb, 1);
			if (IS_ERR(handle))
				return PTR_ERR(handle);
			err = ext4_journal_get_write_access(handle, sbi->s_sbh);
			if (err) {
				ext4_journal_stop(handle);
				return err;
			}
			strlcpy(sbi->s_es->s_last_mounted, cp,
				sizeof(sbi->s_es->s_last_mounted));
			ext4_handle_dirty_super(handle, sb);
			ext4_journal_stop(handle);
		}
	}
	/*
	 * Set up the jbd2_inode if we are opening the inode for
	 * writing and the journal is present
	 */
	if (sbi->s_journal && !ei->jinode && (filp->f_mode & FMODE_WRITE)) {
		struct jbd2_inode *jinode = jbd2_alloc_inode(GFP_KERNEL);

		spin_lock(&inode->i_lock);
		if (!ei->jinode) {
			if (!jinode) {
				spin_unlock(&inode->i_lock);
				return -ENOMEM;
			}
			ei->jinode = jinode;
			jbd2_journal_init_jbd_inode(ei->jinode, inode);
			jinode = NULL;
		}
		spin_unlock(&inode->i_lock);
		if (unlikely(jinode != NULL))
			jbd2_free_inode(jinode);
	}
	return dquot_file_open(inode, filp);
}

/*
 * ext4_llseek() handles both block-mapped and extent-mapped maxbytes values
 * by calling generic_file_llseek_size() with the appropriate maxbytes
 * value for each.
 */
loff_t ext4_llseek(struct file *file, loff_t offset, int origin)
{
	struct inode *inode = file->f_mapping->host;
	loff_t maxbytes;

	if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)))
		maxbytes = EXT4_SB(inode->i_sb)->s_bitmap_maxbytes;
	else
		maxbytes = inode->i_sb->s_maxbytes;

	return generic_file_llseek_size(file, offset, origin,
					maxbytes, i_size_read(inode));
}

const struct file_operations ext4_file_operations = {
	.llseek		= ext4_llseek,
	.read		= do_sync_read,
	.write		= do_sync_write,
	.aio_read	= generic_file_aio_read,
	.aio_write	= ext4_file_write,
	.unlocked_ioctl = ext4_ioctl,
#ifdef CONFIG_COMPAT
	.compat_ioctl	= ext4_compat_ioctl,
#endif
	.mmap		= ext4_file_mmap,
	.open		= ext4_file_open,
	.release	= ext4_release_file,
	.fsync		= ext4_sync_file,
	.splice_read	= generic_file_splice_read,
	.splice_write	= generic_file_splice_write,
	.fallocate	= ext4_fallocate,
};

const struct inode_operations ext4_file_inode_operations = {
	.setattr	= ext4_setattr,
	.getattr	= ext4_getattr,
#ifdef CONFIG_EXT4_FS_XATTR
	.setxattr	= generic_setxattr,
	.getxattr	= generic_getxattr,
	.listxattr	= ext4_listxattr,
	.removexattr	= generic_removexattr,
#endif
	.get_acl	= ext4_get_acl,
	.fiemap		= ext4_fiemap,
};
Commit	Line	Data
ac27a0ec	1	/*
617ba13b	2	* linux/fs/ext4/file.c
ac27a0ec DK	3	*
	4	* Copyright (C) 1992, 1993, 1994, 1995
	5	* Remy Card (card@masi.ibp.fr)
	6	* Laboratoire MASI - Institut Blaise Pascal
	7	* Universite Pierre et Marie Curie (Paris VI)
	8	*
	9	* from
	10	*
	11	* linux/fs/minix/file.c
	12	*
	13	* Copyright (C) 1991, 1992 Linus Torvalds
	14	*
617ba13b	15	* ext4 fs regular file handling primitives
ac27a0ec DK	16	*
	17	* 64-bit file support on 64-bit platforms by Jakub Jelinek
	18	* (jj@sunsite.ms.mff.cuni.cz)
	19	*/
	20
	21	#include <linux/time.h>
	22	#include <linux/fs.h>
dab291af	23	#include <linux/jbd2.h>
bc0b0d6d TT	24	#include <linux/mount.h>
bc0b0d6d TT	25	#include <linux/path.h>
871a2931	26	#include <linux/quotaops.h>
3dcf5451 CH	27	#include "ext4.h"
3dcf5451 CH	28	#include "ext4_jbd2.h"
ac27a0ec DK	29	#include "xattr.h"
	30	#include "acl.h"
	31
	32	/*
	33	* Called when an inode is released. Note that this is different
617ba13b	34	* from ext4_file_open: open gets called at every open, but release
ac27a0ec DK	35	* gets called only when /all/ the files are closed.
ac27a0ec DK	36	*/
af5bc92d	37	static int ext4_release_file(struct inode inode, struct file filp)
ac27a0ec	38	{
19f5fb7a	39	if (ext4_test_inode_state(inode, EXT4_STATE_DA_ALLOC_CLOSE)) {
7d8f9f7d	40	ext4_alloc_da_blocks(inode);
19f5fb7a	41	ext4_clear_inode_state(inode, EXT4_STATE_DA_ALLOC_CLOSE);
7d8f9f7d	42	}
ac27a0ec DK	43	/* if we are the last writer on the inode, drop the block reservation */
ac27a0ec DK	44	if ((filp->f_mode & FMODE_WRITE) &&
d6014301 AK	45	(atomic_read(&inode->i_writecount) == 1) &&
d6014301 AK	46	!EXT4_I(inode)->i_reserved_data_blocks)
ac27a0ec	47	{
0e855ac8	48	down_write(&EXT4_I(inode)->i_data_sem);
c2ea3fde	49	ext4_discard_preallocations(inode);
0e855ac8	50	up_write(&EXT4_I(inode)->i_data_sem);
ac27a0ec DK	51	}
ac27a0ec DK	52	if (is_dx(inode) && filp->private_data)
617ba13b	53	ext4_htree_free_dir_info(filp->private_data);
ac27a0ec DK	54
	55	return 0;
	56	}
	57
e9e3bcec ES	58	static void ext4_aiodio_wait(struct inode *inode)
	59	{
	60	wait_queue_head_t *wq = ext4_ioend_wq(inode);
	61
	62	wait_event(*wq, (atomic_read(&EXT4_I(inode)->i_aiodio_unwritten) == 0));
	63	}
	64
	65	/*
	66	* This tests whether the IO in question is block-aligned or not.
	67	* Ext4 utilizes unwritten extents when hole-filling during direct IO, and they
	68	* are converted to written only after the IO is complete. Until they are
	69	* mapped, these blocks appear as holes, so dio_zero_block() will assume that
	70	* it needs to zero out portions of the start and/or end block. If 2 AIO
	71	* threads are at work on the same unwritten block, they must be synchronized
	72	* or one thread will zero the other's data, causing corruption.
	73	*/
	74	static int
	75	ext4_unaligned_aio(struct inode inode, const struct iovec iov,
	76	unsigned long nr_segs, loff_t pos)
	77	{
	78	struct super_block *sb = inode->i_sb;
	79	int blockmask = sb->s_blocksize - 1;
	80	size_t count = iov_length(iov, nr_segs);
	81	loff_t final_size = pos + count;
	82
	83	if (pos >= inode->i_size)
	84	return 0;
	85
	86	if ((pos & blockmask) \|\| (final_size & blockmask))
	87	return 1;
	88
	89	return 0;
	90	}
	91
ac27a0ec	92	static ssize_t
fbe10494 ZL	93	ext4_file_dio_write(struct kiocb iocb, const struct iovec iov,
fbe10494 ZL	94	unsigned long nr_segs, loff_t pos)
ac27a0ec	95	{
4bd809db ZL	96	struct file *file = iocb->ki_filp;
	97	struct inode *inode = file->f_mapping->host;
	98	struct blk_plug plug;
e9e3bcec	99	int unaligned_aio = 0;
8563000d	100	ssize_t ret;
4bd809db ZL	101	int overwrite = 0;
4bd809db ZL	102	size_t length = iov_length(iov, nr_segs);
ac27a0ec	103
fbe10494 ZL	104	if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS) &&
fbe10494 ZL	105	!is_sync_kiocb(iocb))
e9e3bcec	106	unaligned_aio = ext4_unaligned_aio(inode, iov, nr_segs, pos);
e2b46574	107
e9e3bcec ES	108	/* Unaligned direct AIO must be serialized; see comment above */
	109	if (unaligned_aio) {
	110	static unsigned long unaligned_warn_time;
	111
	112	/* Warn about this once per day */
	113	if (printk_timed_ratelimit(&unaligned_warn_time, 606024*HZ))
	114	ext4_msg(inode->i_sb, KERN_WARNING,
	115	"Unaligned AIO/DIO on inode %ld by %s; "
	116	"performance will be poor.",
	117	inode->i_ino, current->comm);
	118	mutex_lock(ext4_aio_mutex(inode));
	119	ext4_aiodio_wait(inode);
	120	}
	121
4bd809db ZL	122	BUG_ON(iocb->ki_pos != pos);
	123
	124	mutex_lock(&inode->i_mutex);
	125	blk_start_plug(&plug);
	126
	127	iocb->private = &overwrite;
	128
	129	/* check whether we do a DIO overwrite or not */
	130	if (ext4_should_dioread_nolock(inode) && !unaligned_aio &&
	131	!file->f_mapping->nrpages && pos + length <= i_size_read(inode)) {
	132	struct ext4_map_blocks map;
	133	unsigned int blkbits = inode->i_blkbits;
	134	int err, len;
	135
	136	map.m_lblk = pos >> blkbits;
	137	map.m_len = (EXT4_BLOCK_ALIGN(pos + length, blkbits) >> blkbits)
	138	- map.m_lblk;
	139	len = map.m_len;
	140
	141	err = ext4_map_blocks(NULL, inode, &map, 0);
	142	/*
	143	* 'err==len' means that all of blocks has been preallocated no
	144	* matter they are initialized or not. For excluding
	145	* uninitialized extents, we need to check m_flags. There are
	146	* two conditions that indicate for initialized extents.
	147	* 1) If we hit extent cache, EXT4_MAP_MAPPED flag is returned;
	148	* 2) If we do a real lookup, non-flags are returned.
	149	* So we should check these two conditions.
	150	*/
	151	if (err == len && (map.m_flags & EXT4_MAP_MAPPED))
	152	overwrite = 1;
	153	}
	154
	155	ret = __generic_file_aio_write(iocb, iov, nr_segs, &iocb->ki_pos);
	156	mutex_unlock(&inode->i_mutex);
	157
	158	if (ret > 0 \|\| ret == -EIOCBQUEUED) {
	159	ssize_t err;
	160
	161	err = generic_write_sync(file, pos, ret);
	162	if (err < 0 && ret > 0)
	163	ret = err;
	164	}
	165	blk_finish_plug(&plug);
e9e3bcec ES	166
	167	if (unaligned_aio)
	168	mutex_unlock(ext4_aio_mutex(inode));
	169
	170	return ret;
ac27a0ec DK	171	}
ac27a0ec DK	172
ac27a0ec	173	static ssize_t
617ba13b	174	ext4_file_write(struct kiocb iocb, const struct iovec iov,
ac27a0ec DK	175	unsigned long nr_segs, loff_t pos)
ac27a0ec DK	176	{
0d34ec62	177	struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;
8563000d	178	ssize_t ret;
ac27a0ec	179
e2b46574 ES	180	/*
	181	* If we have encountered a bitmap-format file, the size limit
	182	* is smaller than s_maxbytes, which is for extent-mapped files.
	183	*/
	184
12e9b892	185	if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) {
e2b46574 ES	186	struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
e2b46574 ES	187	size_t length = iov_length(iov, nr_segs);
ac27a0ec	188
d889dc83 TO	189	if ((pos > sbi->s_bitmap_maxbytes \|\|
d889dc83 TO	190	(pos == sbi->s_bitmap_maxbytes && length > 0)))
e2b46574 ES	191	return -EFBIG;
	192
	193	if (pos + length > sbi->s_bitmap_maxbytes) {
	194	nr_segs = iov_shorten((struct iovec *)iov, nr_segs,
	195	sbi->s_bitmap_maxbytes - pos);
	196	}
	197	}
	198
fbe10494 ZL	199	if (unlikely(iocb->ki_filp->f_flags & O_DIRECT))
	200	ret = ext4_file_dio_write(iocb, iov, nr_segs, pos);
	201	else
	202	ret = generic_file_aio_write(iocb, iov, nr_segs, pos);
e9e3bcec ES	203
e9e3bcec ES	204	return ret;
ac27a0ec DK	205	}
ac27a0ec DK	206
f0f37e2f	207	static const struct vm_operations_struct ext4_file_vm_ops = {
2e9ee850 AK	208	.fault = filemap_fault,
	209	.page_mkwrite = ext4_page_mkwrite,
	210	};
	211
	212	static int ext4_file_mmap(struct file file, struct vm_area_struct vma)
	213	{
	214	struct address_space *mapping = file->f_mapping;
	215
	216	if (!mapping->a_ops->readpage)
	217	return -ENOEXEC;
	218	file_accessed(file);
	219	vma->vm_ops = &ext4_file_vm_ops;
	220	vma->vm_flags \|= VM_CAN_NONLINEAR;
	221	return 0;
	222	}
	223
bc0b0d6d TT	224	static int ext4_file_open(struct inode * inode, struct file * filp)
	225	{
	226	struct super_block *sb = inode->i_sb;
	227	struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
8aefcd55	228	struct ext4_inode_info *ei = EXT4_I(inode);
bc0b0d6d TT	229	struct vfsmount *mnt = filp->f_path.mnt;
	230	struct path path;
	231	char buf[64], *cp;
	232
	233	if (unlikely(!(sbi->s_mount_flags & EXT4_MF_MNTDIR_SAMPLED) &&
	234	!(sb->s_flags & MS_RDONLY))) {
	235	sbi->s_mount_flags \|= EXT4_MF_MNTDIR_SAMPLED;
	236	/*
	237	* Sample where the filesystem has been mounted and
	238	* store it in the superblock for sysadmin convenience
	239	* when trying to sort through large numbers of block
	240	* devices or filesystem images.
	241	*/
	242	memset(buf, 0, sizeof(buf));
3899167d AV	243	path.mnt = mnt;
3899167d AV	244	path.dentry = mnt->mnt_root;
bc0b0d6d	245	cp = d_path(&path, buf, sizeof(buf));
bc0b0d6d	246	if (!IS_ERR(cp)) {
044ce47f JK	247	handle_t *handle;
	248	int err;
	249
	250	handle = ext4_journal_start_sb(sb, 1);
	251	if (IS_ERR(handle))
	252	return PTR_ERR(handle);
	253	err = ext4_journal_get_write_access(handle, sbi->s_sbh);
	254	if (err) {
	255	ext4_journal_stop(handle);
	256	return err;
	257	}
cf803903 DW	258	strlcpy(sbi->s_es->s_last_mounted, cp,
cf803903 DW	259	sizeof(sbi->s_es->s_last_mounted));
044ce47f JK	260	ext4_handle_dirty_super(handle, sb);
044ce47f JK	261	ext4_journal_stop(handle);
bc0b0d6d TT	262	}
bc0b0d6d TT	263	}
8aefcd55 TT	264	/*
	265	* Set up the jbd2_inode if we are opening the inode for
	266	* writing and the journal is present
	267	*/
	268	if (sbi->s_journal && !ei->jinode && (filp->f_mode & FMODE_WRITE)) {
	269	struct jbd2_inode *jinode = jbd2_alloc_inode(GFP_KERNEL);
	270
	271	spin_lock(&inode->i_lock);
	272	if (!ei->jinode) {
	273	if (!jinode) {
	274	spin_unlock(&inode->i_lock);
	275	return -ENOMEM;
	276	}
	277	ei->jinode = jinode;
	278	jbd2_journal_init_jbd_inode(ei->jinode, inode);
	279	jinode = NULL;
	280	}
	281	spin_unlock(&inode->i_lock);
	282	if (unlikely(jinode != NULL))
	283	jbd2_free_inode(jinode);
	284	}
907f4554	285	return dquot_file_open(inode, filp);
bc0b0d6d TT	286	}
bc0b0d6d TT	287
e0d10bfa	288	/*
ec7268ce ES	289	* ext4_llseek() handles both block-mapped and extent-mapped maxbytes values
	290	* by calling generic_file_llseek_size() with the appropriate maxbytes
	291	* value for each.
e0d10bfa TO	292	*/
	293	loff_t ext4_llseek(struct file *file, loff_t offset, int origin)
	294	{
	295	struct inode *inode = file->f_mapping->host;
	296	loff_t maxbytes;
	297
	298	if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)))
	299	maxbytes = EXT4_SB(inode->i_sb)->s_bitmap_maxbytes;
	300	else
	301	maxbytes = inode->i_sb->s_maxbytes;
e0d10bfa	302
e8b96eb5 ES	303	return generic_file_llseek_size(file, offset, origin,
e8b96eb5 ES	304	maxbytes, i_size_read(inode));
e0d10bfa TO	305	}
e0d10bfa TO	306
617ba13b	307	const struct file_operations ext4_file_operations = {
e0d10bfa	308	.llseek = ext4_llseek,
ac27a0ec DK	309	.read = do_sync_read,
	310	.write = do_sync_write,
	311	.aio_read = generic_file_aio_read,
617ba13b	312	.aio_write = ext4_file_write,
5cdd7b2d	313	.unlocked_ioctl = ext4_ioctl,
ac27a0ec	314	#ifdef CONFIG_COMPAT
617ba13b	315	.compat_ioctl = ext4_compat_ioctl,
ac27a0ec	316	#endif
2e9ee850	317	.mmap = ext4_file_mmap,
bc0b0d6d	318	.open = ext4_file_open,
617ba13b MC	319	.release = ext4_release_file,
617ba13b MC	320	.fsync = ext4_sync_file,
ac27a0ec DK	321	.splice_read = generic_file_splice_read,
ac27a0ec DK	322	.splice_write = generic_file_splice_write,
2fe17c10	323	.fallocate = ext4_fallocate,
ac27a0ec DK	324	};
ac27a0ec DK	325
754661f1	326	const struct inode_operations ext4_file_inode_operations = {
617ba13b	327	.setattr = ext4_setattr,
3e3398a0	328	.getattr = ext4_getattr,
03010a33	329	#ifdef CONFIG_EXT4_FS_XATTR
ac27a0ec DK	330	.setxattr = generic_setxattr,
ac27a0ec DK	331	.getxattr = generic_getxattr,
617ba13b	332	.listxattr = ext4_listxattr,
ac27a0ec DK	333	.removexattr = generic_removexattr,
ac27a0ec DK	334	#endif
4e34e719	335	.get_acl = ext4_get_acl,
6873fa0d	336	.fiemap = ext4_fiemap,
ac27a0ec DK	337	};
ac27a0ec DK	338