Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2)  * JFFS2 -- Journalling Flash File System, Version 2.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  * Copyright © 2001-2007 Red Hat, Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Copyright © 2004-2010 David Woodhouse <dwmw2@infradead.org>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  * Created by David Woodhouse <dwmw2@infradead.org>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  * For licensing information, see the file 'LICENCE' in this directory.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/time.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/pagemap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <linux/highmem.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <linux/crc32.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include <linux/jffs2.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #include "nodelist.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) static int jffs2_write_end(struct file *filp, struct address_space *mapping,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 			loff_t pos, unsigned len, unsigned copied,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 			struct page *pg, void *fsdata);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) static int jffs2_write_begin(struct file *filp, struct address_space *mapping,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 			loff_t pos, unsigned len, unsigned flags,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 			struct page **pagep, void **fsdata);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) static int jffs2_readpage (struct file *filp, struct page *pg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) int jffs2_fsync(struct file *filp, loff_t start, loff_t end, int datasync)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 	struct inode *inode = filp->f_mapping->host;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	ret = file_write_and_wait_range(filp, start, end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	inode_lock(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	/* Trigger GC to flush any pending writes for this inode */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	jffs2_flush_wbuf_gc(c, inode->i_ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 	inode_unlock(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) const struct file_operations jffs2_file_operations =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	.llseek =	generic_file_llseek,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	.open =		generic_file_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54)  	.read_iter =	generic_file_read_iter,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55)  	.write_iter =	generic_file_write_iter,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	.unlocked_ioctl=jffs2_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	.mmap =		generic_file_readonly_mmap,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	.fsync =	jffs2_fsync,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	.splice_read =	generic_file_splice_read,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	.splice_write = iter_file_splice_write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) /* jffs2_file_inode_operations */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) const struct inode_operations jffs2_file_inode_operations =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	.get_acl =	jffs2_get_acl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	.set_acl =	jffs2_set_acl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	.setattr =	jffs2_setattr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	.listxattr =	jffs2_listxattr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) const struct address_space_operations jffs2_file_address_operations =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	.readpage =	jffs2_readpage,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	.write_begin =	jffs2_write_begin,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	.write_end =	jffs2_write_end,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) static int jffs2_do_readpage_nolock (struct inode *inode, struct page *pg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	unsigned char *pg_buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	jffs2_dbg(2, "%s(): ino #%lu, page at offset 0x%lx\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 		  __func__, inode->i_ino, pg->index << PAGE_SHIFT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	BUG_ON(!PageLocked(pg));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	pg_buf = kmap(pg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	/* FIXME: Can kmap fail? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	ret = jffs2_read_inode_range(c, f, pg_buf, pg->index << PAGE_SHIFT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 				     PAGE_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 		ClearPageUptodate(pg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 		SetPageError(pg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 		SetPageUptodate(pg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 		ClearPageError(pg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	flush_dcache_page(pg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	kunmap(pg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	jffs2_dbg(2, "readpage finished\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) int jffs2_do_readpage_unlock(void *data, struct page *pg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	int ret = jffs2_do_readpage_nolock(data, pg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	unlock_page(pg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) static int jffs2_readpage (struct file *filp, struct page *pg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	struct jffs2_inode_info *f = JFFS2_INODE_INFO(pg->mapping->host);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	mutex_lock(&f->sem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	ret = jffs2_do_readpage_unlock(pg->mapping->host, pg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	mutex_unlock(&f->sem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) static int jffs2_write_begin(struct file *filp, struct address_space *mapping,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 			loff_t pos, unsigned len, unsigned flags,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 			struct page **pagep, void **fsdata)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	struct page *pg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	struct inode *inode = mapping->host;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 	struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	pgoff_t index = pos >> PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	uint32_t pageofs = index << PAGE_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	jffs2_dbg(1, "%s()\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	if (pageofs > inode->i_size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 		/* Make new hole frag from old EOF to new page */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 		struct jffs2_raw_inode ri;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 		struct jffs2_full_dnode *fn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 		uint32_t alloc_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 		jffs2_dbg(1, "Writing new hole frag 0x%x-0x%x between current EOF and new page\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 			  (unsigned int)inode->i_size, pageofs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 		ret = jffs2_reserve_space(c, sizeof(ri), &alloc_len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 					  ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 		if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 			goto out_err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 		mutex_lock(&f->sem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 		memset(&ri, 0, sizeof(ri));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 		ri.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 		ri.nodetype = cpu_to_je16(JFFS2_NODETYPE_INODE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 		ri.totlen = cpu_to_je32(sizeof(ri));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 		ri.hdr_crc = cpu_to_je32(crc32(0, &ri, sizeof(struct jffs2_unknown_node)-4));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 		ri.ino = cpu_to_je32(f->inocache->ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 		ri.version = cpu_to_je32(++f->highest_version);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 		ri.mode = cpu_to_jemode(inode->i_mode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 		ri.uid = cpu_to_je16(i_uid_read(inode));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 		ri.gid = cpu_to_je16(i_gid_read(inode));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 		ri.isize = cpu_to_je32(max((uint32_t)inode->i_size, pageofs));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 		ri.atime = ri.ctime = ri.mtime = cpu_to_je32(JFFS2_NOW());
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 		ri.offset = cpu_to_je32(inode->i_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 		ri.dsize = cpu_to_je32(pageofs - inode->i_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 		ri.csize = cpu_to_je32(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 		ri.compr = JFFS2_COMPR_ZERO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 		ri.node_crc = cpu_to_je32(crc32(0, &ri, sizeof(ri)-8));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 		ri.data_crc = cpu_to_je32(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 		fn = jffs2_write_dnode(c, f, &ri, NULL, 0, ALLOC_NORMAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 		if (IS_ERR(fn)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 			ret = PTR_ERR(fn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 			jffs2_complete_reservation(c);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 			mutex_unlock(&f->sem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 			goto out_err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 		ret = jffs2_add_full_dnode_to_inode(c, f, fn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 		if (f->metadata) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 			jffs2_mark_node_obsolete(c, f->metadata->raw);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 			jffs2_free_full_dnode(f->metadata);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 			f->metadata = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 		if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 			jffs2_dbg(1, "Eep. add_full_dnode_to_inode() failed in write_begin, returned %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 				  ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 			jffs2_mark_node_obsolete(c, fn->raw);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 			jffs2_free_full_dnode(fn);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 			jffs2_complete_reservation(c);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 			mutex_unlock(&f->sem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 			goto out_err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 		jffs2_complete_reservation(c);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 		inode->i_size = pageofs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 		mutex_unlock(&f->sem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	 * While getting a page and reading data in, lock c->alloc_sem until
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	 * the page is Uptodate. Otherwise GC task may attempt to read the same
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	 * page in read_cache_page(), which causes a deadlock.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	mutex_lock(&c->alloc_sem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	pg = grab_cache_page_write_begin(mapping, index, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	if (!pg) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 		ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 		goto release_sem;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	*pagep = pg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	 * Read in the page if it wasn't already present. Cannot optimize away
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	 * the whole page write case until jffs2_write_end can handle the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	 * case of a short-copy.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	if (!PageUptodate(pg)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 		mutex_lock(&f->sem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 		ret = jffs2_do_readpage_nolock(inode, pg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 		mutex_unlock(&f->sem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 		if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 			unlock_page(pg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 			put_page(pg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 			goto release_sem;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	jffs2_dbg(1, "end write_begin(). pg->flags %lx\n", pg->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) release_sem:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 	mutex_unlock(&c->alloc_sem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) out_err:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) static int jffs2_write_end(struct file *filp, struct address_space *mapping,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 			loff_t pos, unsigned len, unsigned copied,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 			struct page *pg, void *fsdata)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	/* Actually commit the write from the page cache page we're looking at.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 	 * For now, we write the full page out each time. It sucks, but it's simple
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	struct inode *inode = mapping->host;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 	struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 	struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	struct jffs2_raw_inode *ri;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 	unsigned start = pos & (PAGE_SIZE - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	unsigned end = start + copied;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 	unsigned aligned_start = start & ~3;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 	int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	uint32_t writtenlen = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	jffs2_dbg(1, "%s(): ino #%lu, page at 0x%lx, range %d-%d, flags %lx\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 		  __func__, inode->i_ino, pg->index << PAGE_SHIFT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 		  start, end, pg->flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	/* We need to avoid deadlock with page_cache_read() in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	   jffs2_garbage_collect_pass(). So the page must be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	   up to date to prevent page_cache_read() from trying
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	   to re-lock it. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 	BUG_ON(!PageUptodate(pg));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 	if (end == PAGE_SIZE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 		/* When writing out the end of a page, write out the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 		   _whole_ page. This helps to reduce the number of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 		   nodes in files which have many short writes, like
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 		   syslog files. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 		aligned_start = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 	ri = jffs2_alloc_raw_inode();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 	if (!ri) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 		jffs2_dbg(1, "%s(): Allocation of raw inode failed\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 			  __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 		unlock_page(pg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 		put_page(pg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 	/* Set the fields that the generic jffs2_write_inode_range() code can't find */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 	ri->ino = cpu_to_je32(inode->i_ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 	ri->mode = cpu_to_jemode(inode->i_mode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 	ri->uid = cpu_to_je16(i_uid_read(inode));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 	ri->gid = cpu_to_je16(i_gid_read(inode));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 	ri->isize = cpu_to_je32((uint32_t)inode->i_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 	ri->atime = ri->ctime = ri->mtime = cpu_to_je32(JFFS2_NOW());
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 	/* In 2.4, it was already kmapped by generic_file_write(). Doesn't
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 	   hurt to do it again. The alternative is ifdefs, which are ugly. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 	kmap(pg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 	ret = jffs2_write_inode_range(c, f, ri, page_address(pg) + aligned_start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 				      (pg->index << PAGE_SHIFT) + aligned_start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 				      end - aligned_start, &writtenlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 	kunmap(pg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 	if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 		/* There was an error writing. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 		SetPageError(pg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 	/* Adjust writtenlen for the padding we did, so we don't confuse our caller */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 	writtenlen -= min(writtenlen, (start - aligned_start));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 	if (writtenlen) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 		if (inode->i_size < pos + writtenlen) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 			inode->i_size = pos + writtenlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 			inode->i_blocks = (inode->i_size + 511) >> 9;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 			inode->i_ctime = inode->i_mtime = ITIME(je32_to_cpu(ri->ctime));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 	jffs2_free_raw_inode(ri);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 	if (start+writtenlen < end) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 		/* generic_file_write has written more to the page cache than we've
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 		   actually written to the medium. Mark the page !Uptodate so that
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 		   it gets reread */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 		jffs2_dbg(1, "%s(): Not all bytes written. Marking page !uptodate\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 			__func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 		SetPageError(pg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 		ClearPageUptodate(pg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 	jffs2_dbg(1, "%s() returning %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 		  __func__, writtenlen > 0 ? writtenlen : ret);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 	unlock_page(pg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 	put_page(pg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 	return writtenlen > 0 ? writtenlen : ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) }