[linux-2.6-block.git] / fs / jffs2 / file.c

/*
 * JFFS2 -- Journalling Flash File System, Version 2.
 *
 * Copyright © 2001-2007 Red Hat, Inc.
 * Copyright © 2004-2010 David Woodhouse <dwmw2@infradead.org>
 *
 * Created by David Woodhouse <dwmw2@infradead.org>
 *
 * For licensing information, see the file 'LICENCE' in this directory.
 *
 */

#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/time.h>
#include <linux/pagemap.h>
#include <linux/highmem.h>
#include <linux/crc32.h>
#include <linux/jffs2.h>
#include "nodelist.h"

static int jffs2_write_end(struct file *filp, struct address_space *mapping,
			loff_t pos, unsigned len, unsigned copied,
			struct page *pg, void *fsdata);
static int jffs2_write_begin(struct file *filp, struct address_space *mapping,
			loff_t pos, unsigned len, unsigned flags,
			struct page **pagep, void **fsdata);
static int jffs2_readpage (struct file *filp, struct page *pg);

int jffs2_fsync(struct file *filp, loff_t start, loff_t end, int datasync)
{
	struct inode *inode = filp->f_mapping->host;
	struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
	int ret;

	ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
	if (ret)
		return ret;

	mutex_lock(&inode->i_mutex);
	/* Trigger GC to flush any pending writes for this inode */
	jffs2_flush_wbuf_gc(c, inode->i_ino);
	mutex_unlock(&inode->i_mutex);

	return 0;
}

const struct file_operations jffs2_file_operations =
{
	.llseek =	generic_file_llseek,
	.open =		generic_file_open,
 	.read =		do_sync_read,
 	.aio_read =	generic_file_aio_read,
 	.write =	do_sync_write,
 	.aio_write =	generic_file_aio_write,
	.unlocked_ioctl=jffs2_ioctl,
	.mmap =		generic_file_readonly_mmap,
	.fsync =	jffs2_fsync,
	.splice_read =	generic_file_splice_read,
};

/* jffs2_file_inode_operations */

const struct inode_operations jffs2_file_inode_operations =
{
	.get_acl =	jffs2_get_acl,
	.setattr =	jffs2_setattr,
	.setxattr =	jffs2_setxattr,
	.getxattr =	jffs2_getxattr,
	.listxattr =	jffs2_listxattr,
	.removexattr =	jffs2_removexattr
};

const struct address_space_operations jffs2_file_address_operations =
{
	.readpage =	jffs2_readpage,
	.write_begin =	jffs2_write_begin,
	.write_end =	jffs2_write_end,
};

static int jffs2_do_readpage_nolock (struct inode *inode, struct page *pg)
{
	struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
	struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
	unsigned char *pg_buf;
	int ret;

	D2(printk(KERN_DEBUG "jffs2_do_readpage_nolock(): ino #%lu, page at offset 0x%lx\n", inode->i_ino, pg->index << PAGE_CACHE_SHIFT));

	BUG_ON(!PageLocked(pg));

	pg_buf = kmap(pg);
	/* FIXME: Can kmap fail? */

	ret = jffs2_read_inode_range(c, f, pg_buf, pg->index << PAGE_CACHE_SHIFT, PAGE_CACHE_SIZE);

	if (ret) {
		ClearPageUptodate(pg);
		SetPageError(pg);
	} else {
		SetPageUptodate(pg);
		ClearPageError(pg);
	}

	flush_dcache_page(pg);
	kunmap(pg);

	D2(printk(KERN_DEBUG "readpage finished\n"));
	return ret;
}

int jffs2_do_readpage_unlock(struct inode *inode, struct page *pg)
{
	int ret = jffs2_do_readpage_nolock(inode, pg);
	unlock_page(pg);
	return ret;
}


static int jffs2_readpage (struct file *filp, struct page *pg)
{
	struct jffs2_inode_info *f = JFFS2_INODE_INFO(pg->mapping->host);
	int ret;

	mutex_lock(&f->sem);
	ret = jffs2_do_readpage_unlock(pg->mapping->host, pg);
	mutex_unlock(&f->sem);
	return ret;
}

static int jffs2_write_begin(struct file *filp, struct address_space *mapping,
			loff_t pos, unsigned len, unsigned flags,
			struct page **pagep, void **fsdata)
{
	struct page *pg;
	struct inode *inode = mapping->host;
	struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
	pgoff_t index = pos >> PAGE_CACHE_SHIFT;
	uint32_t pageofs = index << PAGE_CACHE_SHIFT;
	int ret = 0;

	pg = grab_cache_page_write_begin(mapping, index, flags);
	if (!pg)
		return -ENOMEM;
	*pagep = pg;

	D1(printk(KERN_DEBUG "jffs2_write_begin()\n"));

	if (pageofs > inode->i_size) {
		/* Make new hole frag from old EOF to new page */
		struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
		struct jffs2_raw_inode ri;
		struct jffs2_full_dnode *fn;
		uint32_t alloc_len;

		D1(printk(KERN_DEBUG "Writing new hole frag 0x%x-0x%x between current EOF and new page\n",
			  (unsigned int)inode->i_size, pageofs));

		ret = jffs2_reserve_space(c, sizeof(ri), &alloc_len,
					  ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
		if (ret)
			goto out_page;

		mutex_lock(&f->sem);
		memset(&ri, 0, sizeof(ri));

		ri.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
		ri.nodetype = cpu_to_je16(JFFS2_NODETYPE_INODE);
		ri.totlen = cpu_to_je32(sizeof(ri));
		ri.hdr_crc = cpu_to_je32(crc32(0, &ri, sizeof(struct jffs2_unknown_node)-4));

		ri.ino = cpu_to_je32(f->inocache->ino);
		ri.version = cpu_to_je32(++f->highest_version);
		ri.mode = cpu_to_jemode(inode->i_mode);
		ri.uid = cpu_to_je16(inode->i_uid);
		ri.gid = cpu_to_je16(inode->i_gid);
		ri.isize = cpu_to_je32(max((uint32_t)inode->i_size, pageofs));
		ri.atime = ri.ctime = ri.mtime = cpu_to_je32(get_seconds());
		ri.offset = cpu_to_je32(inode->i_size);
		ri.dsize = cpu_to_je32(pageofs - inode->i_size);
		ri.csize = cpu_to_je32(0);
		ri.compr = JFFS2_COMPR_ZERO;
		ri.node_crc = cpu_to_je32(crc32(0, &ri, sizeof(ri)-8));
		ri.data_crc = cpu_to_je32(0);

		fn = jffs2_write_dnode(c, f, &ri, NULL, 0, ALLOC_NORMAL);

		if (IS_ERR(fn)) {
			ret = PTR_ERR(fn);
			jffs2_complete_reservation(c);
			mutex_unlock(&f->sem);
			goto out_page;
		}
		ret = jffs2_add_full_dnode_to_inode(c, f, fn);
		if (f->metadata) {
			jffs2_mark_node_obsolete(c, f->metadata->raw);
			jffs2_free_full_dnode(f->metadata);
			f->metadata = NULL;
		}
		if (ret) {
			D1(printk(KERN_DEBUG "Eep. add_full_dnode_to_inode() failed in write_begin, returned %d\n", ret));
			jffs2_mark_node_obsolete(c, fn->raw);
			jffs2_free_full_dnode(fn);
			jffs2_complete_reservation(c);
			mutex_unlock(&f->sem);
			goto out_page;
		}
		jffs2_complete_reservation(c);
		inode->i_size = pageofs;
		mutex_unlock(&f->sem);
	}

	/*
	 * Read in the page if it wasn't already present. Cannot optimize away
	 * the whole page write case until jffs2_write_end can handle the
	 * case of a short-copy.
	 */
	if (!PageUptodate(pg)) {
		mutex_lock(&f->sem);
		ret = jffs2_do_readpage_nolock(inode, pg);
		mutex_unlock(&f->sem);
		if (ret)
			goto out_page;
	}
	D1(printk(KERN_DEBUG "end write_begin(). pg->flags %lx\n", pg->flags));
	return ret;

out_page:
	unlock_page(pg);
	page_cache_release(pg);
	return ret;
}

static int jffs2_write_end(struct file *filp, struct address_space *mapping,
			loff_t pos, unsigned len, unsigned copied,
			struct page *pg, void *fsdata)
{
	/* Actually commit the write from the page cache page we're looking at.
	 * For now, we write the full page out each time. It sucks, but it's simple
	 */
	struct inode *inode = mapping->host;
	struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
	struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
	struct jffs2_raw_inode *ri;
	unsigned start = pos & (PAGE_CACHE_SIZE - 1);
	unsigned end = start + copied;
	unsigned aligned_start = start & ~3;
	int ret = 0;
	uint32_t writtenlen = 0;

	D1(printk(KERN_DEBUG "jffs2_write_end(): ino #%lu, page at 0x%lx, range %d-%d, flags %lx\n",
		  inode->i_ino, pg->index << PAGE_CACHE_SHIFT, start, end, pg->flags));

	/* We need to avoid deadlock with page_cache_read() in
	   jffs2_garbage_collect_pass(). So the page must be
	   up to date to prevent page_cache_read() from trying
	   to re-lock it. */
	BUG_ON(!PageUptodate(pg));

	if (end == PAGE_CACHE_SIZE) {
		/* When writing out the end of a page, write out the
		   _whole_ page. This helps to reduce the number of
		   nodes in files which have many short writes, like
		   syslog files. */
		aligned_start = 0;
	}

	ri = jffs2_alloc_raw_inode();

	if (!ri) {
		D1(printk(KERN_DEBUG "jffs2_write_end(): Allocation of raw inode failed\n"));
		unlock_page(pg);
		page_cache_release(pg);
		return -ENOMEM;
	}

	/* Set the fields that the generic jffs2_write_inode_range() code can't find */
	ri->ino = cpu_to_je32(inode->i_ino);
	ri->mode = cpu_to_jemode(inode->i_mode);
	ri->uid = cpu_to_je16(inode->i_uid);
	ri->gid = cpu_to_je16(inode->i_gid);
	ri->isize = cpu_to_je32((uint32_t)inode->i_size);
	ri->atime = ri->ctime = ri->mtime = cpu_to_je32(get_seconds());

	/* In 2.4, it was already kmapped by generic_file_write(). Doesn't
	   hurt to do it again. The alternative is ifdefs, which are ugly. */
	kmap(pg);

	ret = jffs2_write_inode_range(c, f, ri, page_address(pg) + aligned_start,
				      (pg->index << PAGE_CACHE_SHIFT) + aligned_start,
				      end - aligned_start, &writtenlen);

	kunmap(pg);

	if (ret) {
		/* There was an error writing. */
		SetPageError(pg);
	}

	/* Adjust writtenlen for the padding we did, so we don't confuse our caller */
	writtenlen -= min(writtenlen, (start - aligned_start));

	if (writtenlen) {
		if (inode->i_size < pos + writtenlen) {
			inode->i_size = pos + writtenlen;
			inode->i_blocks = (inode->i_size + 511) >> 9;

			inode->i_ctime = inode->i_mtime = ITIME(je32_to_cpu(ri->ctime));
		}
	}

	jffs2_free_raw_inode(ri);

	if (start+writtenlen < end) {
		/* generic_file_write has written more to the page cache than we've
		   actually written to the medium. Mark the page !Uptodate so that
		   it gets reread */
		D1(printk(KERN_DEBUG "jffs2_write_end(): Not all bytes written. Marking page !uptodate\n"));
		SetPageError(pg);
		ClearPageUptodate(pg);
	}

	D1(printk(KERN_DEBUG "jffs2_write_end() returning %d\n",
					writtenlen > 0 ? writtenlen : ret));
	unlock_page(pg);
	page_cache_release(pg);
	return writtenlen > 0 ? writtenlen : ret;
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* JFFS2 -- Journalling Flash File System, Version 2.
	3	*
c00c310e	4	* Copyright © 2001-2007 Red Hat, Inc.
6088c058	5	* Copyright © 2004-2010 David Woodhouse <dwmw2@infradead.org>
1da177e4 LT	6	*
	7	* Created by David Woodhouse <dwmw2@infradead.org>
	8	*
	9	* For licensing information, see the file 'LICENCE' in this directory.
	10	*
1da177e4 LT	11	*/
1da177e4 LT	12
1da177e4	13	#include <linux/kernel.h>
1da177e4 LT	14	#include <linux/fs.h>
	15	#include <linux/time.h>
	16	#include <linux/pagemap.h>
	17	#include <linux/highmem.h>
	18	#include <linux/crc32.h>
	19	#include <linux/jffs2.h>
	20	#include "nodelist.h"
	21
205c109a NP	22	static int jffs2_write_end(struct file filp, struct address_space mapping,
	23	loff_t pos, unsigned len, unsigned copied,
	24	struct page pg, void fsdata);
	25	static int jffs2_write_begin(struct file filp, struct address_space mapping,
	26	loff_t pos, unsigned len, unsigned flags,
	27	struct page pagep, void fsdata);
1da177e4 LT	28	static int jffs2_readpage (struct file filp, struct page pg);
1da177e4 LT	29
02c24a82	30	int jffs2_fsync(struct file *filp, loff_t start, loff_t end, int datasync)
1da177e4	31	{
7ea80859	32	struct inode *inode = filp->f_mapping->host;
1da177e4	33	struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
02c24a82	34	int ret;
1da177e4	35
02c24a82 JB	36	ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
	37	if (ret)
	38	return ret;
	39
	40	mutex_lock(&inode->i_mutex);
1da177e4 LT	41	/* Trigger GC to flush any pending writes for this inode */
1da177e4 LT	42	jffs2_flush_wbuf_gc(c, inode->i_ino);
02c24a82	43	mutex_unlock(&inode->i_mutex);
182ec4ee TG	44
182ec4ee TG	45	return 0;
1da177e4 LT	46	}
1da177e4 LT	47
4b6f5d20	48	const struct file_operations jffs2_file_operations =
1da177e4 LT	49	{
	50	.llseek = generic_file_llseek,
	51	.open = generic_file_open,
543ade1f BP	52	.read = do_sync_read,
	53	.aio_read = generic_file_aio_read,
	54	.write = do_sync_write,
	55	.aio_write = generic_file_aio_write,
0533400b	56	.unlocked_ioctl=jffs2_ioctl,
1da177e4 LT	57	.mmap = generic_file_readonly_mmap,
1da177e4 LT	58	.fsync = jffs2_fsync,
5ffc4ef4	59	.splice_read = generic_file_splice_read,
1da177e4 LT	60	};
	61
	62	/* jffs2_file_inode_operations */
	63
92e1d5be	64	const struct inode_operations jffs2_file_inode_operations =
1da177e4	65	{
4e34e719	66	.get_acl = jffs2_get_acl,
aa98d7cf KK	67	.setattr = jffs2_setattr,
	68	.setxattr = jffs2_setxattr,
	69	.getxattr = jffs2_getxattr,
	70	.listxattr = jffs2_listxattr,
	71	.removexattr = jffs2_removexattr
1da177e4 LT	72	};
1da177e4 LT	73
f5e54d6e	74	const struct address_space_operations jffs2_file_address_operations =
1da177e4 LT	75	{
1da177e4 LT	76	.readpage = jffs2_readpage,
205c109a NP	77	.write_begin = jffs2_write_begin,
205c109a NP	78	.write_end = jffs2_write_end,
1da177e4 LT	79	};
	80
	81	static int jffs2_do_readpage_nolock (struct inode inode, struct page pg)
	82	{
	83	struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
	84	struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
	85	unsigned char *pg_buf;
	86	int ret;
	87
	88	D2(printk(KERN_DEBUG "jffs2_do_readpage_nolock(): ino #%lu, page at offset 0x%lx\n", inode->i_ino, pg->index << PAGE_CACHE_SHIFT));
	89
cd7619d6	90	BUG_ON(!PageLocked(pg));
1da177e4 LT	91
	92	pg_buf = kmap(pg);
	93	/* FIXME: Can kmap fail? */
	94
	95	ret = jffs2_read_inode_range(c, f, pg_buf, pg->index << PAGE_CACHE_SHIFT, PAGE_CACHE_SIZE);
	96
	97	if (ret) {
	98	ClearPageUptodate(pg);
	99	SetPageError(pg);
	100	} else {
	101	SetPageUptodate(pg);
	102	ClearPageError(pg);
	103	}
	104
	105	flush_dcache_page(pg);
	106	kunmap(pg);
	107
	108	D2(printk(KERN_DEBUG "readpage finished\n"));
57ca7deb	109	return ret;
1da177e4 LT	110	}
	111
	112	int jffs2_do_readpage_unlock(struct inode inode, struct page pg)
	113	{
	114	int ret = jffs2_do_readpage_nolock(inode, pg);
	115	unlock_page(pg);
	116	return ret;
	117	}
	118
	119
	120	static int jffs2_readpage (struct file filp, struct page pg)
	121	{
	122	struct jffs2_inode_info *f = JFFS2_INODE_INFO(pg->mapping->host);
	123	int ret;
182ec4ee	124
ced22070	125	mutex_lock(&f->sem);
1da177e4	126	ret = jffs2_do_readpage_unlock(pg->mapping->host, pg);
ced22070	127	mutex_unlock(&f->sem);
1da177e4 LT	128	return ret;
	129	}
	130
205c109a NP	131	static int jffs2_write_begin(struct file filp, struct address_space mapping,
	132	loff_t pos, unsigned len, unsigned flags,
	133	struct page pagep, void fsdata)
1da177e4	134	{
205c109a NP	135	struct page *pg;
205c109a NP	136	struct inode *inode = mapping->host;
1da177e4	137	struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
205c109a	138	pgoff_t index = pos >> PAGE_CACHE_SHIFT;
abe2f414	139	uint32_t pageofs = index << PAGE_CACHE_SHIFT;
1da177e4 LT	140	int ret = 0;
1da177e4 LT	141
54566b2c	142	pg = grab_cache_page_write_begin(mapping, index, flags);
205c109a NP	143	if (!pg)
	144	return -ENOMEM;
	145	*pagep = pg;
	146
	147	D1(printk(KERN_DEBUG "jffs2_write_begin()\n"));
1da177e4 LT	148
	149	if (pageofs > inode->i_size) {
	150	/* Make new hole frag from old EOF to new page */
	151	struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
	152	struct jffs2_raw_inode ri;
	153	struct jffs2_full_dnode *fn;
9fe4854c	154	uint32_t alloc_len;
182ec4ee	155
1da177e4 LT	156	D1(printk(KERN_DEBUG "Writing new hole frag 0x%x-0x%x between current EOF and new page\n",
	157	(unsigned int)inode->i_size, pageofs));
	158
9fe4854c DW	159	ret = jffs2_reserve_space(c, sizeof(ri), &alloc_len,
9fe4854c DW	160	ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
1da177e4	161	if (ret)
205c109a	162	goto out_page;
1da177e4	163
ced22070	164	mutex_lock(&f->sem);
1da177e4 LT	165	memset(&ri, 0, sizeof(ri));
	166
	167	ri.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
	168	ri.nodetype = cpu_to_je16(JFFS2_NODETYPE_INODE);
	169	ri.totlen = cpu_to_je32(sizeof(ri));
	170	ri.hdr_crc = cpu_to_je32(crc32(0, &ri, sizeof(struct jffs2_unknown_node)-4));
	171
	172	ri.ino = cpu_to_je32(f->inocache->ino);
	173	ri.version = cpu_to_je32(++f->highest_version);
	174	ri.mode = cpu_to_jemode(inode->i_mode);
	175	ri.uid = cpu_to_je16(inode->i_uid);
	176	ri.gid = cpu_to_je16(inode->i_gid);
	177	ri.isize = cpu_to_je32(max((uint32_t)inode->i_size, pageofs));
	178	ri.atime = ri.ctime = ri.mtime = cpu_to_je32(get_seconds());
	179	ri.offset = cpu_to_je32(inode->i_size);
	180	ri.dsize = cpu_to_je32(pageofs - inode->i_size);
	181	ri.csize = cpu_to_je32(0);
	182	ri.compr = JFFS2_COMPR_ZERO;
	183	ri.node_crc = cpu_to_je32(crc32(0, &ri, sizeof(ri)-8));
	184	ri.data_crc = cpu_to_je32(0);
182ec4ee	185
9fe4854c	186	fn = jffs2_write_dnode(c, f, &ri, NULL, 0, ALLOC_NORMAL);
1da177e4 LT	187
	188	if (IS_ERR(fn)) {
	189	ret = PTR_ERR(fn);
	190	jffs2_complete_reservation(c);
ced22070	191	mutex_unlock(&f->sem);
205c109a	192	goto out_page;
1da177e4 LT	193	}
	194	ret = jffs2_add_full_dnode_to_inode(c, f, fn);
	195	if (f->metadata) {
	196	jffs2_mark_node_obsolete(c, f->metadata->raw);
	197	jffs2_free_full_dnode(f->metadata);
	198	f->metadata = NULL;
	199	}
	200	if (ret) {
205c109a	201	D1(printk(KERN_DEBUG "Eep. add_full_dnode_to_inode() failed in write_begin, returned %d\n", ret));
1da177e4 LT	202	jffs2_mark_node_obsolete(c, fn->raw);
	203	jffs2_free_full_dnode(fn);
	204	jffs2_complete_reservation(c);
ced22070	205	mutex_unlock(&f->sem);
205c109a	206	goto out_page;
1da177e4 LT	207	}
	208	jffs2_complete_reservation(c);
	209	inode->i_size = pageofs;
ced22070	210	mutex_unlock(&f->sem);
1da177e4	211	}
182ec4ee	212
205c109a NP	213	/*
	214	* Read in the page if it wasn't already present. Cannot optimize away
	215	* the whole page write case until jffs2_write_end can handle the
	216	* case of a short-copy.
	217	*/
	218	if (!PageUptodate(pg)) {
ced22070	219	mutex_lock(&f->sem);
1da177e4	220	ret = jffs2_do_readpage_nolock(inode, pg);
ced22070	221	mutex_unlock(&f->sem);
205c109a NP	222	if (ret)
205c109a NP	223	goto out_page;
1da177e4	224	}
205c109a NP	225	D1(printk(KERN_DEBUG "end write_begin(). pg->flags %lx\n", pg->flags));
	226	return ret;
	227
	228	out_page:
	229	unlock_page(pg);
	230	page_cache_release(pg);
1da177e4 LT	231	return ret;
	232	}
	233
205c109a NP	234	static int jffs2_write_end(struct file filp, struct address_space mapping,
	235	loff_t pos, unsigned len, unsigned copied,
	236	struct page pg, void fsdata)
1da177e4 LT	237	{
	238	/* Actually commit the write from the page cache page we're looking at.
	239	* For now, we write the full page out each time. It sucks, but it's simple
	240	*/
205c109a	241	struct inode *inode = mapping->host;
1da177e4 LT	242	struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
	243	struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
	244	struct jffs2_raw_inode *ri;
205c109a NP	245	unsigned start = pos & (PAGE_CACHE_SIZE - 1);
205c109a NP	246	unsigned end = start + copied;
1da177e4 LT	247	unsigned aligned_start = start & ~3;
	248	int ret = 0;
	249	uint32_t writtenlen = 0;
	250
205c109a	251	D1(printk(KERN_DEBUG "jffs2_write_end(): ino #%lu, page at 0x%lx, range %d-%d, flags %lx\n",
1da177e4 LT	252	inode->i_ino, pg->index << PAGE_CACHE_SHIFT, start, end, pg->flags));
1da177e4 LT	253
205c109a NP	254	/* We need to avoid deadlock with page_cache_read() in
	255	jffs2_garbage_collect_pass(). So the page must be
	256	up to date to prevent page_cache_read() from trying
	257	to re-lock it. */
	258	BUG_ON(!PageUptodate(pg));
	259
cf5eba53	260	if (end == PAGE_CACHE_SIZE) {
205c109a NP	261	/* When writing out the end of a page, write out the
	262	_whole_ page. This helps to reduce the number of
	263	nodes in files which have many short writes, like
	264	syslog files. */
2a754b51	265	aligned_start = 0;
1da177e4 LT	266	}
	267
	268	ri = jffs2_alloc_raw_inode();
	269
	270	if (!ri) {
205c109a NP	271	D1(printk(KERN_DEBUG "jffs2_write_end(): Allocation of raw inode failed\n"));
	272	unlock_page(pg);
	273	page_cache_release(pg);
1da177e4 LT	274	return -ENOMEM;
	275	}
	276
	277	/* Set the fields that the generic jffs2_write_inode_range() code can't find */
	278	ri->ino = cpu_to_je32(inode->i_ino);
	279	ri->mode = cpu_to_jemode(inode->i_mode);
	280	ri->uid = cpu_to_je16(inode->i_uid);
	281	ri->gid = cpu_to_je16(inode->i_gid);
	282	ri->isize = cpu_to_je32((uint32_t)inode->i_size);
	283	ri->atime = ri->ctime = ri->mtime = cpu_to_je32(get_seconds());
	284
	285	/* In 2.4, it was already kmapped by generic_file_write(). Doesn't
	286	hurt to do it again. The alternative is ifdefs, which are ugly. */
	287	kmap(pg);
	288
	289	ret = jffs2_write_inode_range(c, f, ri, page_address(pg) + aligned_start,
	290	(pg->index << PAGE_CACHE_SHIFT) + aligned_start,
	291	end - aligned_start, &writtenlen);
	292
	293	kunmap(pg);
	294
	295	if (ret) {
	296	/* There was an error writing. */
	297	SetPageError(pg);
	298	}
182ec4ee	299
1da177e4	300	/* Adjust writtenlen for the padding we did, so we don't confuse our caller */
2a754b51	301	writtenlen -= min(writtenlen, (start - aligned_start));
1da177e4 LT	302
1da177e4 LT	303	if (writtenlen) {
2a754b51 NP	304	if (inode->i_size < pos + writtenlen) {
2a754b51 NP	305	inode->i_size = pos + writtenlen;
1da177e4	306	inode->i_blocks = (inode->i_size + 511) >> 9;
182ec4ee	307
1da177e4 LT	308	inode->i_ctime = inode->i_mtime = ITIME(je32_to_cpu(ri->ctime));
	309	}
	310	}
	311
	312	jffs2_free_raw_inode(ri);
	313
	314	if (start+writtenlen < end) {
	315	/* generic_file_write has written more to the page cache than we've
182ec4ee	316	actually written to the medium. Mark the page !Uptodate so that
1da177e4	317	it gets reread */
205c109a	318	D1(printk(KERN_DEBUG "jffs2_write_end(): Not all bytes written. Marking page !uptodate\n"));
1da177e4 LT	319	SetPageError(pg);
	320	ClearPageUptodate(pg);
	321	}
	322
205c109a NP	323	D1(printk(KERN_DEBUG "jffs2_write_end() returning %d\n",
	324	writtenlen > 0 ? writtenlen : ret));
	325	unlock_page(pg);
	326	page_cache_release(pg);
	327	return writtenlen > 0 ? writtenlen : ret;
1da177e4	328	}