1b2441318SGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0
21da177e4SLinus Torvalds /*
31da177e4SLinus Torvalds * linux/fs/hpfs/file.c
41da177e4SLinus Torvalds *
51da177e4SLinus Torvalds * Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
61da177e4SLinus Torvalds *
71da177e4SLinus Torvalds * file VFS functions
81da177e4SLinus Torvalds */
91da177e4SLinus Torvalds
101da177e4SLinus Torvalds #include "hpfs_fn.h"
11a0c1b759SMikulas Patocka #include <linux/mpage.h>
12e0cba89dSChristoph Hellwig #include <linux/iomap.h>
1310c5db28SChristoph Hellwig #include <linux/fiemap.h>
141da177e4SLinus Torvalds
151da177e4SLinus Torvalds #define BLOCKS(size) (((size) + 511) >> 9)
161da177e4SLinus Torvalds
hpfs_file_release(struct inode * inode,struct file * file)171da177e4SLinus Torvalds static int hpfs_file_release(struct inode *inode, struct file *file)
181da177e4SLinus Torvalds {
199a311b96SArnd Bergmann hpfs_lock(inode->i_sb);
201da177e4SLinus Torvalds hpfs_write_if_changed(inode);
219a311b96SArnd Bergmann hpfs_unlock(inode->i_sb);
221da177e4SLinus Torvalds return 0;
231da177e4SLinus Torvalds }
241da177e4SLinus Torvalds
hpfs_file_fsync(struct file * file,loff_t start,loff_t end,int datasync)2502c24a82SJosef Bacik int hpfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync)
261da177e4SLinus Torvalds {
27bc8728eeSMikulas Patocka struct inode *inode = file->f_mapping->host;
2802c24a82SJosef Bacik int ret;
2902c24a82SJosef Bacik
303b49c9a1SJeff Layton ret = file_write_and_wait_range(file, start, end);
3102c24a82SJosef Bacik if (ret)
3202c24a82SJosef Bacik return ret;
33bc8728eeSMikulas Patocka return sync_blockdev(inode->i_sb->s_bdev);
341da177e4SLinus Torvalds }
351da177e4SLinus Torvalds
361da177e4SLinus Torvalds /*
371da177e4SLinus Torvalds * generic_file_read often calls bmap with non-existing sector,
381da177e4SLinus Torvalds * so we must ignore such errors.
391da177e4SLinus Torvalds */
401da177e4SLinus Torvalds
hpfs_bmap(struct inode * inode,unsigned file_secno,unsigned * n_secs)41a0c1b759SMikulas Patocka static secno hpfs_bmap(struct inode *inode, unsigned file_secno, unsigned *n_secs)
421da177e4SLinus Torvalds {
431da177e4SLinus Torvalds struct hpfs_inode_info *hpfs_inode = hpfs_i(inode);
441da177e4SLinus Torvalds unsigned n, disk_secno;
451da177e4SLinus Torvalds struct fnode *fnode;
461da177e4SLinus Torvalds struct buffer_head *bh;
471da177e4SLinus Torvalds if (BLOCKS(hpfs_i(inode)->mmu_private) <= file_secno) return 0;
481da177e4SLinus Torvalds n = file_secno - hpfs_inode->i_file_sec;
49a0c1b759SMikulas Patocka if (n < hpfs_inode->i_n_secs) {
50a0c1b759SMikulas Patocka *n_secs = hpfs_inode->i_n_secs - n;
51a0c1b759SMikulas Patocka return hpfs_inode->i_disk_sec + n;
52a0c1b759SMikulas Patocka }
531da177e4SLinus Torvalds if (!(fnode = hpfs_map_fnode(inode->i_sb, inode->i_ino, &bh))) return 0;
541da177e4SLinus Torvalds disk_secno = hpfs_bplus_lookup(inode->i_sb, inode, &fnode->btree, file_secno, bh);
551da177e4SLinus Torvalds if (disk_secno == -1) return 0;
561da177e4SLinus Torvalds if (hpfs_chk_sectors(inode->i_sb, disk_secno, 1, "bmap")) return 0;
57a0c1b759SMikulas Patocka n = file_secno - hpfs_inode->i_file_sec;
58a0c1b759SMikulas Patocka if (n < hpfs_inode->i_n_secs) {
59a0c1b759SMikulas Patocka *n_secs = hpfs_inode->i_n_secs - n;
60a0c1b759SMikulas Patocka return hpfs_inode->i_disk_sec + n;
61a0c1b759SMikulas Patocka }
62a0c1b759SMikulas Patocka *n_secs = 1;
631da177e4SLinus Torvalds return disk_secno;
641da177e4SLinus Torvalds }
651da177e4SLinus Torvalds
hpfs_truncate(struct inode * i)6670b31c4cSMarco Stornelli void hpfs_truncate(struct inode *i)
671da177e4SLinus Torvalds {
681da177e4SLinus Torvalds if (IS_IMMUTABLE(i)) return /*-EPERM*/;
697dd29d8dSMikulas Patocka hpfs_lock_assert(i->i_sb);
707dd29d8dSMikulas Patocka
711da177e4SLinus Torvalds hpfs_i(i)->i_n_secs = 0;
721da177e4SLinus Torvalds i->i_blocks = 1 + ((i->i_size + 511) >> 9);
731da177e4SLinus Torvalds hpfs_i(i)->mmu_private = i->i_size;
741da177e4SLinus Torvalds hpfs_truncate_btree(i->i_sb, i->i_ino, 1, ((i->i_size + 511) >> 9));
751da177e4SLinus Torvalds hpfs_write_inode(i);
761da177e4SLinus Torvalds hpfs_i(i)->i_n_secs = 0;
771da177e4SLinus Torvalds }
781da177e4SLinus Torvalds
hpfs_get_block(struct inode * inode,sector_t iblock,struct buffer_head * bh_result,int create)791da177e4SLinus Torvalds static int hpfs_get_block(struct inode *inode, sector_t iblock, struct buffer_head *bh_result, int create)
801da177e4SLinus Torvalds {
817dd29d8dSMikulas Patocka int r;
821da177e4SLinus Torvalds secno s;
83a0c1b759SMikulas Patocka unsigned n_secs;
847dd29d8dSMikulas Patocka hpfs_lock(inode->i_sb);
85a0c1b759SMikulas Patocka s = hpfs_bmap(inode, iblock, &n_secs);
861da177e4SLinus Torvalds if (s) {
87a0c1b759SMikulas Patocka if (bh_result->b_size >> 9 < n_secs)
88a0c1b759SMikulas Patocka n_secs = bh_result->b_size >> 9;
89a64eefaaSMikulas Patocka n_secs = hpfs_search_hotfix_map_for_range(inode->i_sb, s, n_secs);
90a64eefaaSMikulas Patocka if (unlikely(!n_secs)) {
91a64eefaaSMikulas Patocka s = hpfs_search_hotfix_map(inode->i_sb, s);
92a64eefaaSMikulas Patocka n_secs = 1;
93a64eefaaSMikulas Patocka }
941da177e4SLinus Torvalds map_bh(bh_result, inode->i_sb, s);
95a0c1b759SMikulas Patocka bh_result->b_size = n_secs << 9;
967dd29d8dSMikulas Patocka goto ret_0;
971da177e4SLinus Torvalds }
987dd29d8dSMikulas Patocka if (!create) goto ret_0;
991da177e4SLinus Torvalds if (iblock<<9 != hpfs_i(inode)->mmu_private) {
1001da177e4SLinus Torvalds BUG();
1017dd29d8dSMikulas Patocka r = -EIO;
1027dd29d8dSMikulas Patocka goto ret_r;
1031da177e4SLinus Torvalds }
1041da177e4SLinus Torvalds if ((s = hpfs_add_sector_to_btree(inode->i_sb, inode->i_ino, 1, inode->i_blocks - 1)) == -1) {
1051da177e4SLinus Torvalds hpfs_truncate_btree(inode->i_sb, inode->i_ino, 1, inode->i_blocks - 1);
1067dd29d8dSMikulas Patocka r = -ENOSPC;
1077dd29d8dSMikulas Patocka goto ret_r;
1081da177e4SLinus Torvalds }
1091da177e4SLinus Torvalds inode->i_blocks++;
1101da177e4SLinus Torvalds hpfs_i(inode)->mmu_private += 512;
1111da177e4SLinus Torvalds set_buffer_new(bh_result);
112a64eefaaSMikulas Patocka map_bh(bh_result, inode->i_sb, hpfs_search_hotfix_map(inode->i_sb, s));
1137dd29d8dSMikulas Patocka ret_0:
1147dd29d8dSMikulas Patocka r = 0;
1157dd29d8dSMikulas Patocka ret_r:
1167dd29d8dSMikulas Patocka hpfs_unlock(inode->i_sb);
1177dd29d8dSMikulas Patocka return r;
1181da177e4SLinus Torvalds }
1191da177e4SLinus Torvalds
hpfs_iomap_begin(struct inode * inode,loff_t offset,loff_t length,unsigned flags,struct iomap * iomap,struct iomap * srcmap)120e0cba89dSChristoph Hellwig static int hpfs_iomap_begin(struct inode *inode, loff_t offset, loff_t length,
121e0cba89dSChristoph Hellwig unsigned flags, struct iomap *iomap, struct iomap *srcmap)
122e0cba89dSChristoph Hellwig {
123e0cba89dSChristoph Hellwig struct super_block *sb = inode->i_sb;
124e0cba89dSChristoph Hellwig unsigned int blkbits = inode->i_blkbits;
125e0cba89dSChristoph Hellwig unsigned int n_secs;
126e0cba89dSChristoph Hellwig secno s;
127e0cba89dSChristoph Hellwig
128e0cba89dSChristoph Hellwig if (WARN_ON_ONCE(flags & (IOMAP_WRITE | IOMAP_ZERO)))
129e0cba89dSChristoph Hellwig return -EINVAL;
130e0cba89dSChristoph Hellwig
131e0cba89dSChristoph Hellwig iomap->bdev = inode->i_sb->s_bdev;
132e0cba89dSChristoph Hellwig iomap->offset = offset;
133e0cba89dSChristoph Hellwig
134e0cba89dSChristoph Hellwig hpfs_lock(sb);
135e0cba89dSChristoph Hellwig s = hpfs_bmap(inode, offset >> blkbits, &n_secs);
136e0cba89dSChristoph Hellwig if (s) {
137e0cba89dSChristoph Hellwig n_secs = hpfs_search_hotfix_map_for_range(sb, s,
138e0cba89dSChristoph Hellwig min_t(loff_t, n_secs, length));
139e0cba89dSChristoph Hellwig if (unlikely(!n_secs)) {
140e0cba89dSChristoph Hellwig s = hpfs_search_hotfix_map(sb, s);
141e0cba89dSChristoph Hellwig n_secs = 1;
142e0cba89dSChristoph Hellwig }
143e0cba89dSChristoph Hellwig iomap->type = IOMAP_MAPPED;
144e0cba89dSChristoph Hellwig iomap->flags = IOMAP_F_MERGED;
145e0cba89dSChristoph Hellwig iomap->addr = (u64)s << blkbits;
146e0cba89dSChristoph Hellwig iomap->length = (u64)n_secs << blkbits;
147e0cba89dSChristoph Hellwig } else {
148e0cba89dSChristoph Hellwig iomap->type = IOMAP_HOLE;
149e0cba89dSChristoph Hellwig iomap->addr = IOMAP_NULL_ADDR;
150e0cba89dSChristoph Hellwig iomap->length = 1 << blkbits;
151e0cba89dSChristoph Hellwig }
152e0cba89dSChristoph Hellwig
153e0cba89dSChristoph Hellwig hpfs_unlock(sb);
154e0cba89dSChristoph Hellwig return 0;
155e0cba89dSChristoph Hellwig }
156e0cba89dSChristoph Hellwig
157e0cba89dSChristoph Hellwig static const struct iomap_ops hpfs_iomap_ops = {
158e0cba89dSChristoph Hellwig .iomap_begin = hpfs_iomap_begin,
159e0cba89dSChristoph Hellwig };
160e0cba89dSChristoph Hellwig
hpfs_read_folio(struct file * file,struct folio * folio)161f132ab7dSMatthew Wilcox (Oracle) static int hpfs_read_folio(struct file *file, struct folio *folio)
162a0c1b759SMikulas Patocka {
163f132ab7dSMatthew Wilcox (Oracle) return mpage_read_folio(folio, hpfs_get_block);
164a0c1b759SMikulas Patocka }
165a0c1b759SMikulas Patocka
hpfs_readahead(struct readahead_control * rac)166d4388340SMatthew Wilcox (Oracle) static void hpfs_readahead(struct readahead_control *rac)
1671da177e4SLinus Torvalds {
168d4388340SMatthew Wilcox (Oracle) mpage_readahead(rac, hpfs_get_block);
169a0c1b759SMikulas Patocka }
170a0c1b759SMikulas Patocka
hpfs_writepages(struct address_space * mapping,struct writeback_control * wbc)171a0c1b759SMikulas Patocka static int hpfs_writepages(struct address_space *mapping,
172a0c1b759SMikulas Patocka struct writeback_control *wbc)
173a0c1b759SMikulas Patocka {
174a0c1b759SMikulas Patocka return mpage_writepages(mapping, wbc, hpfs_get_block);
1751da177e4SLinus Torvalds }
176d6091b72SNick Piggin
hpfs_write_failed(struct address_space * mapping,loff_t to)17770b31c4cSMarco Stornelli static void hpfs_write_failed(struct address_space *mapping, loff_t to)
17870b31c4cSMarco Stornelli {
17970b31c4cSMarco Stornelli struct inode *inode = mapping->host;
18070b31c4cSMarco Stornelli
181bbd465dfSMikulas Patocka hpfs_lock(inode->i_sb);
182bbd465dfSMikulas Patocka
18370b31c4cSMarco Stornelli if (to > inode->i_size) {
1847caef267SKirill A. Shutemov truncate_pagecache(inode, inode->i_size);
18570b31c4cSMarco Stornelli hpfs_truncate(inode);
18670b31c4cSMarco Stornelli }
187bbd465dfSMikulas Patocka
188bbd465dfSMikulas Patocka hpfs_unlock(inode->i_sb);
18970b31c4cSMarco Stornelli }
19070b31c4cSMarco Stornelli
hpfs_write_begin(struct file * file,struct address_space * mapping,loff_t pos,unsigned len,struct page ** pagep,void ** fsdata)191d6091b72SNick Piggin static int hpfs_write_begin(struct file *file, struct address_space *mapping,
1929d6b0cd7SMatthew Wilcox (Oracle) loff_t pos, unsigned len,
193d6091b72SNick Piggin struct page **pagep, void **fsdata)
1941da177e4SLinus Torvalds {
195282dc178SChristoph Hellwig int ret;
196282dc178SChristoph Hellwig
197d6091b72SNick Piggin *pagep = NULL;
198be3bbbc5SMatthew Wilcox (Oracle) ret = cont_write_begin(file, mapping, pos, len, pagep, fsdata,
199d6091b72SNick Piggin hpfs_get_block,
200d6091b72SNick Piggin &hpfs_i(mapping->host)->mmu_private);
20170b31c4cSMarco Stornelli if (unlikely(ret))
20270b31c4cSMarco Stornelli hpfs_write_failed(mapping, pos + len);
203282dc178SChristoph Hellwig
204282dc178SChristoph Hellwig return ret;
2051da177e4SLinus Torvalds }
206d6091b72SNick Piggin
hpfs_write_end(struct file * file,struct address_space * mapping,loff_t pos,unsigned len,unsigned copied,struct page * pagep,void * fsdata)2075f2e354fSAl Viro static int hpfs_write_end(struct file *file, struct address_space *mapping,
2085f2e354fSAl Viro loff_t pos, unsigned len, unsigned copied,
2095f2e354fSAl Viro struct page *pagep, void *fsdata)
2105f2e354fSAl Viro {
2115f2e354fSAl Viro struct inode *inode = mapping->host;
2125f2e354fSAl Viro int err;
2135f2e354fSAl Viro err = generic_write_end(file, mapping, pos, len, copied, pagep, fsdata);
2145f2e354fSAl Viro if (err < len)
2155f2e354fSAl Viro hpfs_write_failed(mapping, pos + len);
2165f2e354fSAl Viro if (!(err < 0)) {
2175f2e354fSAl Viro /* make sure we write it on close, if not earlier */
2185f2e354fSAl Viro hpfs_lock(inode->i_sb);
2195f2e354fSAl Viro hpfs_i(inode)->i_dirty = 1;
2205f2e354fSAl Viro hpfs_unlock(inode->i_sb);
2215f2e354fSAl Viro }
2225f2e354fSAl Viro return err;
2235f2e354fSAl Viro }
2245f2e354fSAl Viro
_hpfs_bmap(struct address_space * mapping,sector_t block)2251da177e4SLinus Torvalds static sector_t _hpfs_bmap(struct address_space *mapping, sector_t block)
2261da177e4SLinus Torvalds {
2271da177e4SLinus Torvalds return generic_block_bmap(mapping, block, hpfs_get_block);
2281da177e4SLinus Torvalds }
229d6091b72SNick Piggin
hpfs_fiemap(struct inode * inode,struct fiemap_extent_info * fieinfo,u64 start,u64 len)23091fff9b3SMikulas Patocka static int hpfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, u64 start, u64 len)
23191fff9b3SMikulas Patocka {
232e0cba89dSChristoph Hellwig int ret;
233e0cba89dSChristoph Hellwig
234e0cba89dSChristoph Hellwig inode_lock(inode);
235e0cba89dSChristoph Hellwig len = min_t(u64, len, i_size_read(inode));
236e0cba89dSChristoph Hellwig ret = iomap_fiemap(inode, fieinfo, start, len, &hpfs_iomap_ops);
237e0cba89dSChristoph Hellwig inode_unlock(inode);
238e0cba89dSChristoph Hellwig
239e0cba89dSChristoph Hellwig return ret;
24091fff9b3SMikulas Patocka }
24191fff9b3SMikulas Patocka
242f5e54d6eSChristoph Hellwig const struct address_space_operations hpfs_aops = {
243e621900aSMatthew Wilcox (Oracle) .dirty_folio = block_dirty_folio,
2447ba13abbSMatthew Wilcox (Oracle) .invalidate_folio = block_invalidate_folio,
245f132ab7dSMatthew Wilcox (Oracle) .read_folio = hpfs_read_folio,
246d4388340SMatthew Wilcox (Oracle) .readahead = hpfs_readahead,
247a0c1b759SMikulas Patocka .writepages = hpfs_writepages,
248d6091b72SNick Piggin .write_begin = hpfs_write_begin,
2495f2e354fSAl Viro .write_end = hpfs_write_end,
250cd2e6024SChristoph Hellwig .bmap = _hpfs_bmap,
251cd2e6024SChristoph Hellwig .migrate_folio = buffer_migrate_folio,
2521da177e4SLinus Torvalds };
2531da177e4SLinus Torvalds
2544b6f5d20SArjan van de Ven const struct file_operations hpfs_file_ops =
2551da177e4SLinus Torvalds {
2561da177e4SLinus Torvalds .llseek = generic_file_llseek,
257aad4f8bbSAl Viro .read_iter = generic_file_read_iter,
2588174202bSAl Viro .write_iter = generic_file_write_iter,
2591da177e4SLinus Torvalds .mmap = generic_file_mmap,
2601da177e4SLinus Torvalds .release = hpfs_file_release,
2611da177e4SLinus Torvalds .fsync = hpfs_file_fsync,
262*2cb1e089SDavid Howells .splice_read = filemap_splice_read,
263a27b5b97SMikulas Patocka .unlocked_ioctl = hpfs_ioctl,
264314999dcSArnd Bergmann .compat_ioctl = compat_ptr_ioctl,
2651da177e4SLinus Torvalds };
2661da177e4SLinus Torvalds
26792e1d5beSArjan van de Ven const struct inode_operations hpfs_file_iops =
2681da177e4SLinus Torvalds {
269ca30bc99SChristoph Hellwig .setattr = hpfs_setattr,
27091fff9b3SMikulas Patocka .fiemap = hpfs_fiemap,
2711da177e4SLinus Torvalds };
272