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/falloc.h>
17 #include <linux/types.h>
18 #include <linux/uaccess.h>
19 #include <linux/mount.h>
27 static int f2fs_vm_page_mkwrite(struct vm_area_struct *vma,
30 struct page *page = vmf->page;
31 struct inode *inode = vma->vm_file->f_path.dentry->d_inode;
32 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
34 struct dnode_of_data dn;
39 sb_start_pagefault(inode->i_sb);
41 mutex_lock_op(sbi, DATA_NEW);
43 /* block allocation */
44 set_new_dnode(&dn, inode, NULL, NULL, 0);
45 err = get_dnode_of_data(&dn, page->index, 0);
47 mutex_unlock_op(sbi, DATA_NEW);
51 old_blk_addr = dn.data_blkaddr;
53 if (old_blk_addr == NULL_ADDR) {
54 err = reserve_new_block(&dn);
57 mutex_unlock_op(sbi, DATA_NEW);
63 mutex_unlock_op(sbi, DATA_NEW);
66 if (page->mapping != inode->i_mapping ||
67 page_offset(page) >= i_size_read(inode) ||
68 !PageUptodate(page)) {
75 * check to see if the page is mapped already (no holes)
77 if (PageMappedToDisk(page))
81 wait_on_page_writeback(page);
83 /* page is wholly or partially inside EOF */
84 if (((page->index + 1) << PAGE_CACHE_SHIFT) > i_size_read(inode)) {
86 offset = i_size_read(inode) & ~PAGE_CACHE_MASK;
87 zero_user_segment(page, offset, PAGE_CACHE_SIZE);
90 SetPageUptodate(page);
92 file_update_time(vma->vm_file);
94 sb_end_pagefault(inode->i_sb);
95 return block_page_mkwrite_return(err);
98 static const struct vm_operations_struct f2fs_file_vm_ops = {
99 .fault = filemap_fault,
100 .page_mkwrite = f2fs_vm_page_mkwrite,
103 static int need_to_sync_dir(struct f2fs_sb_info *sbi, struct inode *inode)
105 struct dentry *dentry;
108 inode = igrab(inode);
109 dentry = d_find_any_alias(inode);
114 pino = dentry->d_parent->d_inode->i_ino;
117 return !is_checkpointed_node(sbi, pino);
120 int f2fs_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
122 struct inode *inode = file->f_mapping->host;
123 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
124 unsigned long long cur_version;
126 bool need_cp = false;
127 struct writeback_control wbc = {
128 .sync_mode = WB_SYNC_ALL,
129 .nr_to_write = LONG_MAX,
133 if (inode->i_sb->s_flags & MS_RDONLY)
136 ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
140 mutex_lock(&inode->i_mutex);
142 if (datasync && !(inode->i_state & I_DIRTY_DATASYNC))
145 mutex_lock(&sbi->cp_mutex);
146 cur_version = le64_to_cpu(F2FS_CKPT(sbi)->checkpoint_ver);
147 mutex_unlock(&sbi->cp_mutex);
149 if (F2FS_I(inode)->data_version != cur_version &&
150 !(inode->i_state & I_DIRTY))
152 F2FS_I(inode)->data_version--;
154 if (!S_ISREG(inode->i_mode) || inode->i_nlink != 1)
156 if (is_inode_flag_set(F2FS_I(inode), FI_NEED_CP))
158 if (!space_for_roll_forward(sbi))
160 if (need_to_sync_dir(sbi, inode))
163 f2fs_write_inode(inode, NULL);
166 /* all the dirty node pages should be flushed for POR */
167 ret = f2fs_sync_fs(inode->i_sb, 1);
168 clear_inode_flag(F2FS_I(inode), FI_NEED_CP);
170 while (sync_node_pages(sbi, inode->i_ino, &wbc) == 0)
171 f2fs_write_inode(inode, NULL);
172 filemap_fdatawait_range(sbi->node_inode->i_mapping,
176 mutex_unlock(&inode->i_mutex);
180 static int f2fs_file_mmap(struct file *file, struct vm_area_struct *vma)
183 vma->vm_ops = &f2fs_file_vm_ops;
187 static int truncate_data_blocks_range(struct dnode_of_data *dn, int count)
189 int nr_free = 0, ofs = dn->ofs_in_node;
190 struct f2fs_sb_info *sbi = F2FS_SB(dn->inode->i_sb);
191 struct f2fs_node *raw_node;
194 raw_node = page_address(dn->node_page);
195 addr = blkaddr_in_node(raw_node) + ofs;
197 for ( ; count > 0; count--, addr++, dn->ofs_in_node++) {
198 block_t blkaddr = le32_to_cpu(*addr);
199 if (blkaddr == NULL_ADDR)
202 update_extent_cache(NULL_ADDR, dn);
203 invalidate_blocks(sbi, blkaddr);
204 dec_valid_block_count(sbi, dn->inode, 1);
208 set_page_dirty(dn->node_page);
211 dn->ofs_in_node = ofs;
215 void truncate_data_blocks(struct dnode_of_data *dn)
217 truncate_data_blocks_range(dn, ADDRS_PER_BLOCK);
220 static void truncate_partial_data_page(struct inode *inode, u64 from)
222 unsigned offset = from & (PAGE_CACHE_SIZE - 1);
228 page = find_data_page(inode, from >> PAGE_CACHE_SHIFT);
233 wait_on_page_writeback(page);
234 zero_user(page, offset, PAGE_CACHE_SIZE - offset);
235 set_page_dirty(page);
236 f2fs_put_page(page, 1);
239 static int truncate_blocks(struct inode *inode, u64 from)
241 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
242 unsigned int blocksize = inode->i_sb->s_blocksize;
243 struct dnode_of_data dn;
248 free_from = (pgoff_t)
249 ((from + blocksize - 1) >> (sbi->log_blocksize));
251 mutex_lock_op(sbi, DATA_TRUNC);
253 set_new_dnode(&dn, inode, NULL, NULL, 0);
254 err = get_dnode_of_data(&dn, free_from, RDONLY_NODE);
258 mutex_unlock_op(sbi, DATA_TRUNC);
262 if (IS_INODE(dn.node_page))
263 count = ADDRS_PER_INODE;
265 count = ADDRS_PER_BLOCK;
267 count -= dn.ofs_in_node;
269 if (dn.ofs_in_node || IS_INODE(dn.node_page)) {
270 truncate_data_blocks_range(&dn, count);
276 err = truncate_inode_blocks(inode, free_from);
277 mutex_unlock_op(sbi, DATA_TRUNC);
279 /* lastly zero out the first data page */
280 truncate_partial_data_page(inode, from);
285 void f2fs_truncate(struct inode *inode)
287 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
288 S_ISLNK(inode->i_mode)))
291 if (!truncate_blocks(inode, i_size_read(inode))) {
292 inode->i_mtime = inode->i_ctime = CURRENT_TIME;
293 mark_inode_dirty(inode);
296 f2fs_balance_fs(F2FS_SB(inode->i_sb));
299 static int f2fs_getattr(struct vfsmount *mnt,
300 struct dentry *dentry, struct kstat *stat)
302 struct inode *inode = dentry->d_inode;
303 generic_fillattr(inode, stat);
308 #ifdef CONFIG_F2FS_FS_POSIX_ACL
309 static void __setattr_copy(struct inode *inode, const struct iattr *attr)
311 struct f2fs_inode_info *fi = F2FS_I(inode);
312 unsigned int ia_valid = attr->ia_valid;
314 if (ia_valid & ATTR_UID)
315 inode->i_uid = attr->ia_uid;
316 if (ia_valid & ATTR_GID)
317 inode->i_gid = attr->ia_gid;
318 if (ia_valid & ATTR_ATIME)
319 inode->i_atime = timespec_trunc(attr->ia_atime,
320 inode->i_sb->s_time_gran);
321 if (ia_valid & ATTR_MTIME)
322 inode->i_mtime = timespec_trunc(attr->ia_mtime,
323 inode->i_sb->s_time_gran);
324 if (ia_valid & ATTR_CTIME)
325 inode->i_ctime = timespec_trunc(attr->ia_ctime,
326 inode->i_sb->s_time_gran);
327 if (ia_valid & ATTR_MODE) {
328 umode_t mode = attr->ia_mode;
330 if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID))
332 set_acl_inode(fi, mode);
336 #define __setattr_copy setattr_copy
339 int f2fs_setattr(struct dentry *dentry, struct iattr *attr)
341 struct inode *inode = dentry->d_inode;
342 struct f2fs_inode_info *fi = F2FS_I(inode);
345 err = inode_change_ok(inode, attr);
349 if ((attr->ia_valid & ATTR_SIZE) &&
350 attr->ia_size != i_size_read(inode)) {
351 truncate_setsize(inode, attr->ia_size);
352 f2fs_truncate(inode);
355 __setattr_copy(inode, attr);
357 if (attr->ia_valid & ATTR_MODE) {
358 err = f2fs_acl_chmod(inode);
359 if (err || is_inode_flag_set(fi, FI_ACL_MODE)) {
360 inode->i_mode = fi->i_acl_mode;
361 clear_inode_flag(fi, FI_ACL_MODE);
365 mark_inode_dirty(inode);
369 const struct inode_operations f2fs_file_inode_operations = {
370 .getattr = f2fs_getattr,
371 .setattr = f2fs_setattr,
372 .get_acl = f2fs_get_acl,
373 #ifdef CONFIG_F2FS_FS_XATTR
374 .setxattr = generic_setxattr,
375 .getxattr = generic_getxattr,
376 .listxattr = f2fs_listxattr,
377 .removexattr = generic_removexattr,
381 static void fill_zero(struct inode *inode, pgoff_t index,
382 loff_t start, loff_t len)
389 page = get_new_data_page(inode, index, false);
392 wait_on_page_writeback(page);
393 zero_user(page, start, len);
394 set_page_dirty(page);
395 f2fs_put_page(page, 1);
399 int truncate_hole(struct inode *inode, pgoff_t pg_start, pgoff_t pg_end)
404 for (index = pg_start; index < pg_end; index++) {
405 struct dnode_of_data dn;
406 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
408 mutex_lock_op(sbi, DATA_TRUNC);
409 set_new_dnode(&dn, inode, NULL, NULL, 0);
410 err = get_dnode_of_data(&dn, index, RDONLY_NODE);
412 mutex_unlock_op(sbi, DATA_TRUNC);
418 if (dn.data_blkaddr != NULL_ADDR)
419 truncate_data_blocks_range(&dn, 1);
421 mutex_unlock_op(sbi, DATA_TRUNC);
426 static int punch_hole(struct inode *inode, loff_t offset, loff_t len, int mode)
428 pgoff_t pg_start, pg_end;
429 loff_t off_start, off_end;
432 pg_start = ((unsigned long long) offset) >> PAGE_CACHE_SHIFT;
433 pg_end = ((unsigned long long) offset + len) >> PAGE_CACHE_SHIFT;
435 off_start = offset & (PAGE_CACHE_SIZE - 1);
436 off_end = (offset + len) & (PAGE_CACHE_SIZE - 1);
438 if (pg_start == pg_end) {
439 fill_zero(inode, pg_start, off_start,
440 off_end - off_start);
443 fill_zero(inode, pg_start++, off_start,
444 PAGE_CACHE_SIZE - off_start);
446 fill_zero(inode, pg_end, 0, off_end);
448 if (pg_start < pg_end) {
449 struct address_space *mapping = inode->i_mapping;
450 loff_t blk_start, blk_end;
452 blk_start = pg_start << PAGE_CACHE_SHIFT;
453 blk_end = pg_end << PAGE_CACHE_SHIFT;
454 truncate_inode_pages_range(mapping, blk_start,
456 ret = truncate_hole(inode, pg_start, pg_end);
460 if (!(mode & FALLOC_FL_KEEP_SIZE) &&
461 i_size_read(inode) <= (offset + len)) {
462 i_size_write(inode, offset);
463 mark_inode_dirty(inode);
469 static int expand_inode_data(struct inode *inode, loff_t offset,
470 loff_t len, int mode)
472 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
473 pgoff_t index, pg_start, pg_end;
474 loff_t new_size = i_size_read(inode);
475 loff_t off_start, off_end;
478 ret = inode_newsize_ok(inode, (len + offset));
482 pg_start = ((unsigned long long) offset) >> PAGE_CACHE_SHIFT;
483 pg_end = ((unsigned long long) offset + len) >> PAGE_CACHE_SHIFT;
485 off_start = offset & (PAGE_CACHE_SIZE - 1);
486 off_end = (offset + len) & (PAGE_CACHE_SIZE - 1);
488 for (index = pg_start; index <= pg_end; index++) {
489 struct dnode_of_data dn;
491 mutex_lock_op(sbi, DATA_NEW);
493 set_new_dnode(&dn, inode, NULL, NULL, 0);
494 ret = get_dnode_of_data(&dn, index, 0);
496 mutex_unlock_op(sbi, DATA_NEW);
500 if (dn.data_blkaddr == NULL_ADDR) {
501 ret = reserve_new_block(&dn);
504 mutex_unlock_op(sbi, DATA_NEW);
510 mutex_unlock_op(sbi, DATA_NEW);
512 if (pg_start == pg_end)
513 new_size = offset + len;
514 else if (index == pg_start && off_start)
515 new_size = (index + 1) << PAGE_CACHE_SHIFT;
516 else if (index == pg_end)
517 new_size = (index << PAGE_CACHE_SHIFT) + off_end;
519 new_size += PAGE_CACHE_SIZE;
522 if (!(mode & FALLOC_FL_KEEP_SIZE) &&
523 i_size_read(inode) < new_size) {
524 i_size_write(inode, new_size);
525 mark_inode_dirty(inode);
531 static long f2fs_fallocate(struct file *file, int mode,
532 loff_t offset, loff_t len)
534 struct inode *inode = file->f_path.dentry->d_inode;
535 struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
538 if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
541 if (mode & FALLOC_FL_PUNCH_HOLE)
542 ret = punch_hole(inode, offset, len, mode);
544 ret = expand_inode_data(inode, offset, len, mode);
546 f2fs_balance_fs(sbi);
550 #define F2FS_REG_FLMASK (~(FS_DIRSYNC_FL | FS_TOPDIR_FL))
551 #define F2FS_OTHER_FLMASK (FS_NODUMP_FL | FS_NOATIME_FL)
553 static inline __u32 f2fs_mask_flags(umode_t mode, __u32 flags)
557 else if (S_ISREG(mode))
558 return flags & F2FS_REG_FLMASK;
560 return flags & F2FS_OTHER_FLMASK;
563 long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
565 struct inode *inode = filp->f_dentry->d_inode;
566 struct f2fs_inode_info *fi = F2FS_I(inode);
571 case FS_IOC_GETFLAGS:
572 flags = fi->i_flags & FS_FL_USER_VISIBLE;
573 return put_user(flags, (int __user *) arg);
574 case FS_IOC_SETFLAGS:
576 unsigned int oldflags;
578 ret = mnt_want_write(filp->f_path.mnt);
582 if (!inode_owner_or_capable(inode)) {
587 if (get_user(flags, (int __user *) arg)) {
592 flags = f2fs_mask_flags(inode->i_mode, flags);
594 mutex_lock(&inode->i_mutex);
596 oldflags = fi->i_flags;
598 if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) {
599 if (!capable(CAP_LINUX_IMMUTABLE)) {
600 mutex_unlock(&inode->i_mutex);
606 flags = flags & FS_FL_USER_MODIFIABLE;
607 flags |= oldflags & ~FS_FL_USER_MODIFIABLE;
609 mutex_unlock(&inode->i_mutex);
611 f2fs_set_inode_flags(inode);
612 inode->i_ctime = CURRENT_TIME;
613 mark_inode_dirty(inode);
615 mnt_drop_write(filp->f_path.mnt);
623 const struct file_operations f2fs_file_operations = {
624 .llseek = generic_file_llseek,
625 .read = do_sync_read,
626 .write = do_sync_write,
627 .aio_read = generic_file_aio_read,
628 .aio_write = generic_file_aio_write,
629 .open = generic_file_open,
630 .mmap = f2fs_file_mmap,
631 .fsync = f2fs_sync_file,
632 .fallocate = f2fs_fallocate,
633 .unlocked_ioctl = f2fs_ioctl,
634 .splice_read = generic_file_splice_read,
635 .splice_write = generic_file_splice_write,