add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/fs/jffs2/file.c
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@@ -57,6 +57,7 @@
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 	.mmap =		generic_file_readonly_mmap,
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 	.fsync =	jffs2_fsync,
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 	.splice_read =	generic_file_splice_read,
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+	.splice_write = iter_file_splice_write,
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 };
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 /* jffs2_file_inode_operations */
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@@ -137,19 +138,18 @@
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 	struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
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 	struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
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 	pgoff_t index = pos >> PAGE_SHIFT;
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-	uint32_t pageofs = index << PAGE_SHIFT;
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 	int ret = 0;
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 	jffs2_dbg(1, "%s()\n", __func__);
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-	if (pageofs > inode->i_size) {
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-		/* Make new hole frag from old EOF to new page */
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+	if (pos > inode->i_size) {
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+		/* Make new hole frag from old EOF to new position */
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 		struct jffs2_raw_inode ri;
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 		struct jffs2_full_dnode *fn;
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 		uint32_t alloc_len;
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-		jffs2_dbg(1, "Writing new hole frag 0x%x-0x%x between current EOF and new page\n",
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-			  (unsigned int)inode->i_size, pageofs);
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+		jffs2_dbg(1, "Writing new hole frag 0x%x-0x%x between current EOF and new position\n",
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+			  (unsigned int)inode->i_size, (uint32_t)pos);
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 		ret = jffs2_reserve_space(c, sizeof(ri), &alloc_len,
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 					  ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
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@@ -169,10 +169,10 @@
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 		ri.mode = cpu_to_jemode(inode->i_mode);
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 		ri.uid = cpu_to_je16(i_uid_read(inode));
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 		ri.gid = cpu_to_je16(i_gid_read(inode));
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-		ri.isize = cpu_to_je32(max((uint32_t)inode->i_size, pageofs));
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+		ri.isize = cpu_to_je32((uint32_t)pos);
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 		ri.atime = ri.ctime = ri.mtime = cpu_to_je32(JFFS2_NOW());
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 		ri.offset = cpu_to_je32(inode->i_size);
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-		ri.dsize = cpu_to_je32(pageofs - inode->i_size);
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+		ri.dsize = cpu_to_je32((uint32_t)pos - inode->i_size);
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 		ri.csize = cpu_to_je32(0);
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 		ri.compr = JFFS2_COMPR_ZERO;
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 		ri.node_crc = cpu_to_je32(crc32(0, &ri, sizeof(ri)-8));
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@@ -202,7 +202,7 @@
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 			goto out_err;
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 		}
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 		jffs2_complete_reservation(c);
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-		inode->i_size = pageofs;
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+		inode->i_size = pos;
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 		mutex_unlock(&f->sem);
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 	}
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