4 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
5 * http://www.samsung.com/
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
12 #include <linux/f2fs_fs.h>
13 #include <linux/stat.h>
14 #include <linux/buffer_head.h>
15 #include <linux/writeback.h>
16 #include <linux/blkdev.h>
17 #include <linux/falloc.h>
18 #include <linux/types.h>
19 #include <linux/compat.h>
20 #include <linux/uaccess.h>
21 #include <linux/mount.h>
28 #include <trace/events/f2fs.h>
30 static int f2fs_vm_page_mkwrite(struct vm_area_struct *vma,
33 struct page *page = vmf->page;
34 struct inode *inode = file_inode(vma->vm_file);
35 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
37 struct dnode_of_data dn;
42 sb_start_pagefault(inode->i_sb);
44 /* block allocation */
45 ilock = mutex_lock_op(sbi);
46 set_new_dnode(&dn, inode, NULL, NULL, 0);
47 err = get_dnode_of_data(&dn, page->index, ALLOC_NODE);
49 mutex_unlock_op(sbi, ilock);
53 old_blk_addr = dn.data_blkaddr;
55 if (old_blk_addr == NULL_ADDR) {
56 err = reserve_new_block(&dn);
59 mutex_unlock_op(sbi, ilock);
64 mutex_unlock_op(sbi, ilock);
67 if (page->mapping != inode->i_mapping ||
68 page_offset(page) >= i_size_read(inode) ||
69 !PageUptodate(page)) {
76 * check to see if the page is mapped already (no holes)
78 if (PageMappedToDisk(page))
82 wait_on_page_writeback(page);
84 /* page is wholly or partially inside EOF */
85 if (((page->index + 1) << PAGE_CACHE_SHIFT) > i_size_read(inode)) {
87 offset = i_size_read(inode) & ~PAGE_CACHE_MASK;
88 zero_user_segment(page, offset, PAGE_CACHE_SIZE);
91 SetPageUptodate(page);
93 file_update_time(vma->vm_file);
95 sb_end_pagefault(inode->i_sb);
96 return block_page_mkwrite_return(err);
99 static const struct vm_operations_struct f2fs_file_vm_ops = {
100 .fault = filemap_fault,
101 .page_mkwrite = f2fs_vm_page_mkwrite,
102 .remap_pages = generic_file_remap_pages,
105 int f2fs_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
107 struct inode *inode = file->f_mapping->host;
108 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
110 bool need_cp = false;
111 struct writeback_control wbc = {
112 .sync_mode = WB_SYNC_ALL,
113 .nr_to_write = LONG_MAX,
117 if (inode->i_sb->s_flags & MS_RDONLY)
120 trace_f2fs_sync_file_enter(inode);
121 ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
123 trace_f2fs_sync_file_exit(inode, need_cp, datasync, ret);
127 /* guarantee free sections for fsync */
128 f2fs_balance_fs(sbi);
130 mutex_lock(&inode->i_mutex);
132 if (datasync && !(inode->i_state & I_DIRTY_DATASYNC))
135 if (!S_ISREG(inode->i_mode) || inode->i_nlink != 1)
137 else if (is_cp_file(inode))
139 else if (!space_for_roll_forward(sbi))
141 else if (!is_checkpointed_node(sbi, F2FS_I(inode)->i_pino))
145 /* all the dirty node pages should be flushed for POR */
146 ret = f2fs_sync_fs(inode->i_sb, 1);
148 /* if there is no written node page, write its inode page */
149 while (!sync_node_pages(sbi, inode->i_ino, &wbc)) {
150 ret = f2fs_write_inode(inode, NULL);
154 filemap_fdatawait_range(sbi->node_inode->i_mapping,
156 ret = blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL, NULL);
159 mutex_unlock(&inode->i_mutex);
160 trace_f2fs_sync_file_exit(inode, need_cp, datasync, ret);
164 static int f2fs_file_mmap(struct file *file, struct vm_area_struct *vma)
167 vma->vm_ops = &f2fs_file_vm_ops;
171 static int truncate_data_blocks_range(struct dnode_of_data *dn, int count)
173 int nr_free = 0, ofs = dn->ofs_in_node;
174 struct f2fs_sb_info *sbi = F2FS_SB(dn->inode->i_sb);
175 struct f2fs_node *raw_node;
178 raw_node = page_address(dn->node_page);
179 addr = blkaddr_in_node(raw_node) + ofs;
181 for ( ; count > 0; count--, addr++, dn->ofs_in_node++) {
182 block_t blkaddr = le32_to_cpu(*addr);
183 if (blkaddr == NULL_ADDR)
186 update_extent_cache(NULL_ADDR, dn);
187 invalidate_blocks(sbi, blkaddr);
188 dec_valid_block_count(sbi, dn->inode, 1);
192 set_page_dirty(dn->node_page);
195 dn->ofs_in_node = ofs;
197 trace_f2fs_truncate_data_blocks_range(dn->inode, dn->nid,
198 dn->ofs_in_node, nr_free);
202 void truncate_data_blocks(struct dnode_of_data *dn)
204 truncate_data_blocks_range(dn, ADDRS_PER_BLOCK);
207 static void truncate_partial_data_page(struct inode *inode, u64 from)
209 unsigned offset = from & (PAGE_CACHE_SIZE - 1);
215 page = find_data_page(inode, from >> PAGE_CACHE_SHIFT, false);
220 if (page->mapping != inode->i_mapping) {
221 f2fs_put_page(page, 1);
224 wait_on_page_writeback(page);
225 zero_user(page, offset, PAGE_CACHE_SIZE - offset);
226 set_page_dirty(page);
227 f2fs_put_page(page, 1);
230 static int truncate_blocks(struct inode *inode, u64 from)
232 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
233 unsigned int blocksize = inode->i_sb->s_blocksize;
234 struct dnode_of_data dn;
236 int count = 0, ilock = -1;
239 trace_f2fs_truncate_blocks_enter(inode, from);
241 free_from = (pgoff_t)
242 ((from + blocksize - 1) >> (sbi->log_blocksize));
244 ilock = mutex_lock_op(sbi);
245 set_new_dnode(&dn, inode, NULL, NULL, 0);
246 err = get_dnode_of_data(&dn, free_from, LOOKUP_NODE);
250 mutex_unlock_op(sbi, ilock);
251 trace_f2fs_truncate_blocks_exit(inode, err);
255 if (IS_INODE(dn.node_page))
256 count = ADDRS_PER_INODE;
258 count = ADDRS_PER_BLOCK;
260 count -= dn.ofs_in_node;
263 if (dn.ofs_in_node || IS_INODE(dn.node_page)) {
264 truncate_data_blocks_range(&dn, count);
270 err = truncate_inode_blocks(inode, free_from);
271 mutex_unlock_op(sbi, ilock);
273 /* lastly zero out the first data page */
274 truncate_partial_data_page(inode, from);
276 trace_f2fs_truncate_blocks_exit(inode, err);
280 void f2fs_truncate(struct inode *inode)
282 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
283 S_ISLNK(inode->i_mode)))
286 trace_f2fs_truncate(inode);
288 if (!truncate_blocks(inode, i_size_read(inode))) {
289 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
290 mark_inode_dirty(inode);
294 static int f2fs_getattr(struct vfsmount *mnt,
295 struct dentry *dentry, struct kstat *stat)
297 struct inode *inode = dentry->d_inode;
298 generic_fillattr(inode, stat);
303 #ifdef CONFIG_F2FS_FS_POSIX_ACL
304 static void __setattr_copy(struct inode *inode, const struct iattr *attr)
306 struct f2fs_inode_info *fi = F2FS_I(inode);
307 unsigned int ia_valid = attr->ia_valid;
309 if (ia_valid & ATTR_UID)
310 inode->i_uid = attr->ia_uid;
311 if (ia_valid & ATTR_GID)
312 inode->i_gid = attr->ia_gid;
313 if (ia_valid & ATTR_ATIME)
314 inode->i_atime = timespec_trunc(attr->ia_atime,
315 inode->i_sb->s_time_gran);
316 if (ia_valid & ATTR_MTIME)
317 inode->i_mtime = timespec_trunc(attr->ia_mtime,
318 inode->i_sb->s_time_gran);
319 if (ia_valid & ATTR_CTIME)
320 inode->i_ctime = timespec_trunc(attr->ia_ctime,
321 inode->i_sb->s_time_gran);
322 if (ia_valid & ATTR_MODE) {
323 umode_t mode = attr->ia_mode;
325 if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
327 set_acl_inode(fi, mode);
331 #define __setattr_copy setattr_copy
334 int f2fs_setattr(struct dentry *dentry, struct iattr *attr)
336 struct inode *inode = dentry->d_inode;
337 struct f2fs_inode_info *fi = F2FS_I(inode);
340 err = inode_change_ok(inode, attr);
344 if ((attr->ia_valid & ATTR_SIZE) &&
345 attr->ia_size != i_size_read(inode)) {
346 truncate_setsize(inode, attr->ia_size);
347 f2fs_truncate(inode);
348 f2fs_balance_fs(F2FS_SB(inode->i_sb));
351 __setattr_copy(inode, attr);
353 if (attr->ia_valid & ATTR_MODE) {
354 err = f2fs_acl_chmod(inode);
355 if (err || is_inode_flag_set(fi, FI_ACL_MODE)) {
356 inode->i_mode = fi->i_acl_mode;
357 clear_inode_flag(fi, FI_ACL_MODE);
361 mark_inode_dirty(inode);
365 const struct inode_operations f2fs_file_inode_operations = {
366 .getattr = f2fs_getattr,
367 .setattr = f2fs_setattr,
368 .get_acl = f2fs_get_acl,
369 #ifdef CONFIG_F2FS_FS_XATTR
370 .setxattr = generic_setxattr,
371 .getxattr = generic_getxattr,
372 .listxattr = f2fs_listxattr,
373 .removexattr = generic_removexattr,
377 static void fill_zero(struct inode *inode, pgoff_t index,
378 loff_t start, loff_t len)
380 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
387 f2fs_balance_fs(sbi);
389 ilock = mutex_lock_op(sbi);
390 page = get_new_data_page(inode, index, false);
391 mutex_unlock_op(sbi, ilock);
394 wait_on_page_writeback(page);
395 zero_user(page, start, len);
396 set_page_dirty(page);
397 f2fs_put_page(page, 1);
401 int truncate_hole(struct inode *inode, pgoff_t pg_start, pgoff_t pg_end)
406 for (index = pg_start; index < pg_end; index++) {
407 struct dnode_of_data dn;
409 set_new_dnode(&dn, inode, NULL, NULL, 0);
410 err = get_dnode_of_data(&dn, index, LOOKUP_NODE);
417 if (dn.data_blkaddr != NULL_ADDR)
418 truncate_data_blocks_range(&dn, 1);
424 static int punch_hole(struct inode *inode, loff_t offset, loff_t len, int mode)
426 pgoff_t pg_start, pg_end;
427 loff_t off_start, off_end;
430 pg_start = ((unsigned long long) offset) >> PAGE_CACHE_SHIFT;
431 pg_end = ((unsigned long long) offset + len) >> PAGE_CACHE_SHIFT;
433 off_start = offset & (PAGE_CACHE_SIZE - 1);
434 off_end = (offset + len) & (PAGE_CACHE_SIZE - 1);
436 if (pg_start == pg_end) {
437 fill_zero(inode, pg_start, off_start,
438 off_end - off_start);
441 fill_zero(inode, pg_start++, off_start,
442 PAGE_CACHE_SIZE - off_start);
444 fill_zero(inode, pg_end, 0, off_end);
446 if (pg_start < pg_end) {
447 struct address_space *mapping = inode->i_mapping;
448 loff_t blk_start, blk_end;
449 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
452 f2fs_balance_fs(sbi);
454 blk_start = pg_start << PAGE_CACHE_SHIFT;
455 blk_end = pg_end << PAGE_CACHE_SHIFT;
456 truncate_inode_pages_range(mapping, blk_start,
459 ilock = mutex_lock_op(sbi);
460 ret = truncate_hole(inode, pg_start, pg_end);
461 mutex_unlock_op(sbi, ilock);
465 if (!(mode & FALLOC_FL_KEEP_SIZE) &&
466 i_size_read(inode) <= (offset + len)) {
467 i_size_write(inode, offset);
468 mark_inode_dirty(inode);
474 static int expand_inode_data(struct inode *inode, loff_t offset,
475 loff_t len, int mode)
477 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
478 pgoff_t index, pg_start, pg_end;
479 loff_t new_size = i_size_read(inode);
480 loff_t off_start, off_end;
483 ret = inode_newsize_ok(inode, (len + offset));
487 pg_start = ((unsigned long long) offset) >> PAGE_CACHE_SHIFT;
488 pg_end = ((unsigned long long) offset + len) >> PAGE_CACHE_SHIFT;
490 off_start = offset & (PAGE_CACHE_SIZE - 1);
491 off_end = (offset + len) & (PAGE_CACHE_SIZE - 1);
493 for (index = pg_start; index <= pg_end; index++) {
494 struct dnode_of_data dn;
497 ilock = mutex_lock_op(sbi);
498 set_new_dnode(&dn, inode, NULL, NULL, 0);
499 ret = get_dnode_of_data(&dn, index, ALLOC_NODE);
501 mutex_unlock_op(sbi, ilock);
505 if (dn.data_blkaddr == NULL_ADDR) {
506 ret = reserve_new_block(&dn);
509 mutex_unlock_op(sbi, ilock);
514 mutex_unlock_op(sbi, ilock);
516 if (pg_start == pg_end)
517 new_size = offset + len;
518 else if (index == pg_start && off_start)
519 new_size = (index + 1) << PAGE_CACHE_SHIFT;
520 else if (index == pg_end)
521 new_size = (index << PAGE_CACHE_SHIFT) + off_end;
523 new_size += PAGE_CACHE_SIZE;
526 if (!(mode & FALLOC_FL_KEEP_SIZE) &&
527 i_size_read(inode) < new_size) {
528 i_size_write(inode, new_size);
529 mark_inode_dirty(inode);
535 static long f2fs_fallocate(struct file *file, int mode,
536 loff_t offset, loff_t len)
538 struct inode *inode = file_inode(file);
541 if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
544 if (mode & FALLOC_FL_PUNCH_HOLE)
545 ret = punch_hole(inode, offset, len, mode);
547 ret = expand_inode_data(inode, offset, len, mode);
550 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
551 mark_inode_dirty(inode);
553 trace_f2fs_fallocate(inode, mode, offset, len, ret);
557 #define F2FS_REG_FLMASK (~(FS_DIRSYNC_FL | FS_TOPDIR_FL))
558 #define F2FS_OTHER_FLMASK (FS_NODUMP_FL | FS_NOATIME_FL)
560 static inline __u32 f2fs_mask_flags(umode_t mode, __u32 flags)
564 else if (S_ISREG(mode))
565 return flags & F2FS_REG_FLMASK;
567 return flags & F2FS_OTHER_FLMASK;
570 long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
572 struct inode *inode = file_inode(filp);
573 struct f2fs_inode_info *fi = F2FS_I(inode);
578 case FS_IOC_GETFLAGS:
579 flags = fi->i_flags & FS_FL_USER_VISIBLE;
580 return put_user(flags, (int __user *) arg);
581 case FS_IOC_SETFLAGS:
583 unsigned int oldflags;
585 ret = mnt_want_write_file(filp);
589 if (!inode_owner_or_capable(inode)) {
594 if (get_user(flags, (int __user *) arg)) {
599 flags = f2fs_mask_flags(inode->i_mode, flags);
601 mutex_lock(&inode->i_mutex);
603 oldflags = fi->i_flags;
605 if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) {
606 if (!capable(CAP_LINUX_IMMUTABLE)) {
607 mutex_unlock(&inode->i_mutex);
613 flags = flags & FS_FL_USER_MODIFIABLE;
614 flags |= oldflags & ~FS_FL_USER_MODIFIABLE;
616 mutex_unlock(&inode->i_mutex);
618 f2fs_set_inode_flags(inode);
619 inode->i_ctime = CURRENT_TIME;
620 mark_inode_dirty(inode);
622 mnt_drop_write_file(filp);
631 long f2fs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
634 case F2FS_IOC32_GETFLAGS:
635 cmd = F2FS_IOC_GETFLAGS;
637 case F2FS_IOC32_SETFLAGS:
638 cmd = F2FS_IOC_SETFLAGS;
643 return f2fs_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
647 const struct file_operations f2fs_file_operations = {
648 .llseek = generic_file_llseek,
649 .read = do_sync_read,
650 .write = do_sync_write,
651 .aio_read = generic_file_aio_read,
652 .aio_write = generic_file_aio_write,
653 .open = generic_file_open,
654 .mmap = f2fs_file_mmap,
655 .fsync = f2fs_sync_file,
656 .fallocate = f2fs_fallocate,
657 .unlocked_ioctl = f2fs_ioctl,
659 .compat_ioctl = f2fs_compat_ioctl,
661 .splice_read = generic_file_splice_read,
662 .splice_write = generic_file_splice_write,