+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0
-#ifndef NO_BCACHEFS_FS
-
-#include "bcachefs.h"
-#include "alloc_foreground.h"
-#include "bkey_buf.h"
-#include "btree_update.h"
-#include "buckets.h"
-#include "clock.h"
-#include "error.h"
-#include "extents.h"
-#include "extent_update.h"
-#include "fs.h"
-#include "fs-io.h"
-#include "fs-io-buffered.h"
-#include "fs-io-pagecache.h"
-#include "fsck.h"
-#include "inode.h"
-#include "journal.h"
-#include "io_misc.h"
-#include "keylist.h"
-#include "quota.h"
-#include "reflink.h"
-#include "trace.h"
-
-#include <linux/aio.h>
-#include <linux/backing-dev.h>
-#include <linux/falloc.h>
-#include <linux/migrate.h>
-#include <linux/mmu_context.h>
-#include <linux/pagevec.h>
-#include <linux/rmap.h>
-#include <linux/sched/signal.h>
-#include <linux/task_io_accounting_ops.h>
-#include <linux/uio.h>
-
-#include <trace/events/writeback.h>
-
-struct nocow_flush {
- struct closure *cl;
- struct bch_dev *ca;
- struct bio bio;
-};
-
-static void nocow_flush_endio(struct bio *_bio)
-{
-
- struct nocow_flush *bio = container_of(_bio, struct nocow_flush, bio);
-
- closure_put(bio->cl);
- percpu_ref_put(&bio->ca->io_ref);
- bio_put(&bio->bio);
-}
-
-void bch2_inode_flush_nocow_writes_async(struct bch_fs *c,
- struct bch_inode_info *inode,
- struct closure *cl)
-{
- struct nocow_flush *bio;
- struct bch_dev *ca;
- struct bch_devs_mask devs;
- unsigned dev;
-
- dev = find_first_bit(inode->ei_devs_need_flush.d, BCH_SB_MEMBERS_MAX);
- if (dev == BCH_SB_MEMBERS_MAX)
- return;
-
- devs = inode->ei_devs_need_flush;
- memset(&inode->ei_devs_need_flush, 0, sizeof(inode->ei_devs_need_flush));
-
- for_each_set_bit(dev, devs.d, BCH_SB_MEMBERS_MAX) {
- rcu_read_lock();
- ca = rcu_dereference(c->devs[dev]);
- if (ca && !percpu_ref_tryget(&ca->io_ref))
- ca = NULL;
- rcu_read_unlock();
-
- if (!ca)
- continue;
-
- bio = container_of(bio_alloc_bioset(ca->disk_sb.bdev, 0,
- REQ_OP_FLUSH,
- GFP_KERNEL,
- &c->nocow_flush_bioset),
- struct nocow_flush, bio);
- bio->cl = cl;
- bio->ca = ca;
- bio->bio.bi_end_io = nocow_flush_endio;
- closure_bio_submit(&bio->bio, cl);
- }
-}
-
-static int bch2_inode_flush_nocow_writes(struct bch_fs *c,
- struct bch_inode_info *inode)
-{
- struct closure cl;
-
- closure_init_stack(&cl);
- bch2_inode_flush_nocow_writes_async(c, inode, &cl);
- closure_sync(&cl);
-
- return 0;
-}
-
-/* i_size updates: */
-
-struct inode_new_size {
- loff_t new_size;
- u64 now;
- unsigned fields;
-};
-
-static int inode_set_size(struct btree_trans *trans,
- struct bch_inode_info *inode,
- struct bch_inode_unpacked *bi,
- void *p)
-{
- struct inode_new_size *s = p;
-
- bi->bi_size = s->new_size;
- if (s->fields & ATTR_ATIME)
- bi->bi_atime = s->now;
- if (s->fields & ATTR_MTIME)
- bi->bi_mtime = s->now;
- if (s->fields & ATTR_CTIME)
- bi->bi_ctime = s->now;
-
- return 0;
-}
-
-int __must_check bch2_write_inode_size(struct bch_fs *c,
- struct bch_inode_info *inode,
- loff_t new_size, unsigned fields)
-{
- struct inode_new_size s = {
- .new_size = new_size,
- .now = bch2_current_time(c),
- .fields = fields,
- };
-
- return bch2_write_inode(c, inode, inode_set_size, &s, fields);
-}
-
-void __bch2_i_sectors_acct(struct bch_fs *c, struct bch_inode_info *inode,
- struct quota_res *quota_res, s64 sectors)
-{
- bch2_fs_inconsistent_on((s64) inode->v.i_blocks + sectors < 0, c,
- "inode %lu i_blocks underflow: %llu + %lli < 0 (ondisk %lli)",
- inode->v.i_ino, (u64) inode->v.i_blocks, sectors,
- inode->ei_inode.bi_sectors);
- inode->v.i_blocks += sectors;
-
-#ifdef CONFIG_BCACHEFS_QUOTA
- if (quota_res &&
- !test_bit(EI_INODE_SNAPSHOT, &inode->ei_flags) &&
- sectors > 0) {
- BUG_ON(sectors > quota_res->sectors);
- BUG_ON(sectors > inode->ei_quota_reserved);
-
- quota_res->sectors -= sectors;
- inode->ei_quota_reserved -= sectors;
- } else {
- bch2_quota_acct(c, inode->ei_qid, Q_SPC, sectors, KEY_TYPE_QUOTA_WARN);
- }
-#endif
-}
-
-/* fsync: */
-
-/*
- * inode->ei_inode.bi_journal_seq won't be up to date since it's set in an
- * insert trigger: look up the btree inode instead
- */
-static int bch2_flush_inode(struct bch_fs *c,
- struct bch_inode_info *inode)
-{
- struct bch_inode_unpacked u;
- int ret;
-
- if (c->opts.journal_flush_disabled)
- return 0;
-
- ret = bch2_inode_find_by_inum(c, inode_inum(inode), &u);
- if (ret)
- return ret;
-
- return bch2_journal_flush_seq(&c->journal, u.bi_journal_seq) ?:
- bch2_inode_flush_nocow_writes(c, inode);
-}
-
-int bch2_fsync(struct file *file, loff_t start, loff_t end, int datasync)
-{
- struct bch_inode_info *inode = file_bch_inode(file);
- struct bch_fs *c = inode->v.i_sb->s_fs_info;
- int ret;
-
- ret = file_write_and_wait_range(file, start, end);
- if (ret)
- goto out;
- ret = sync_inode_metadata(&inode->v, 1);
- if (ret)
- goto out;
- ret = bch2_flush_inode(c, inode);
-out:
- return bch2_err_class(ret);
-}
-
-/* truncate: */
-
-static inline int range_has_data(struct bch_fs *c, u32 subvol,
- struct bpos start,
- struct bpos end)
-{
- struct btree_trans *trans = bch2_trans_get(c);
- struct btree_iter iter;
- struct bkey_s_c k;
- int ret = 0;
-retry:
- bch2_trans_begin(trans);
-
- ret = bch2_subvolume_get_snapshot(trans, subvol, &start.snapshot);
- if (ret)
- goto err;
-
- for_each_btree_key_upto_norestart(trans, iter, BTREE_ID_extents, start, end, 0, k, ret)
- if (bkey_extent_is_data(k.k) && !bkey_extent_is_unwritten(k)) {
- ret = 1;
- break;
- }
- start = iter.pos;
- bch2_trans_iter_exit(trans, &iter);
-err:
- if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
- goto retry;
-
- bch2_trans_put(trans);
- return ret;
-}
-
-static int __bch2_truncate_folio(struct bch_inode_info *inode,
- pgoff_t index, loff_t start, loff_t end)
-{
- struct bch_fs *c = inode->v.i_sb->s_fs_info;
- struct address_space *mapping = inode->v.i_mapping;
- struct bch_folio *s;
- unsigned start_offset;
- unsigned end_offset;
- unsigned i;
- struct folio *folio;
- s64 i_sectors_delta = 0;
- int ret = 0;
- u64 end_pos;
-
- folio = filemap_lock_folio(mapping, index);
- if (IS_ERR_OR_NULL(folio)) {
- /*
- * XXX: we're doing two index lookups when we end up reading the
- * folio
- */
- ret = range_has_data(c, inode->ei_subvol,
- POS(inode->v.i_ino, (index << PAGE_SECTORS_SHIFT)),
- POS(inode->v.i_ino, (index << PAGE_SECTORS_SHIFT) + PAGE_SECTORS));
- if (ret <= 0)
- return ret;
-
- folio = __filemap_get_folio(mapping, index,
- FGP_LOCK|FGP_CREAT, GFP_KERNEL);
- if (IS_ERR_OR_NULL(folio)) {
- ret = -ENOMEM;
- goto out;
- }
- }
-
- BUG_ON(start >= folio_end_pos(folio));
- BUG_ON(end <= folio_pos(folio));
-
- start_offset = max(start, folio_pos(folio)) - folio_pos(folio);
- end_offset = min_t(u64, end, folio_end_pos(folio)) - folio_pos(folio);
-
- /* Folio boundary? Nothing to do */
- if (start_offset == 0 &&
- end_offset == folio_size(folio)) {
- ret = 0;
- goto unlock;
- }
-
- s = bch2_folio_create(folio, 0);
- if (!s) {
- ret = -ENOMEM;
- goto unlock;
- }
-
- if (!folio_test_uptodate(folio)) {
- ret = bch2_read_single_folio(folio, mapping);
- if (ret)
- goto unlock;
- }
-
- ret = bch2_folio_set(c, inode_inum(inode), &folio, 1);
- if (ret)
- goto unlock;
-
- for (i = round_up(start_offset, block_bytes(c)) >> 9;
- i < round_down(end_offset, block_bytes(c)) >> 9;
- i++) {
- s->s[i].nr_replicas = 0;
-
- i_sectors_delta -= s->s[i].state == SECTOR_dirty;
- bch2_folio_sector_set(folio, s, i, SECTOR_unallocated);
- }
-
- bch2_i_sectors_acct(c, inode, NULL, i_sectors_delta);
-
- /*
- * Caller needs to know whether this folio will be written out by
- * writeback - doing an i_size update if necessary - or whether it will
- * be responsible for the i_size update.
- *
- * Note that we shouldn't ever see a folio beyond EOF, but check and
- * warn if so. This has been observed by failure to clean up folios
- * after a short write and there's still a chance reclaim will fix
- * things up.
- */
- WARN_ON_ONCE(folio_pos(folio) >= inode->v.i_size);
- end_pos = folio_end_pos(folio);
- if (inode->v.i_size > folio_pos(folio))
- end_pos = min_t(u64, inode->v.i_size, end_pos);
- ret = s->s[folio_pos_to_s(folio, end_pos - 1)].state >= SECTOR_dirty;
-
- folio_zero_segment(folio, start_offset, end_offset);
-
- /*
- * Bit of a hack - we don't want truncate to fail due to -ENOSPC.
- *
- * XXX: because we aren't currently tracking whether the folio has actual
- * data in it (vs. just 0s, or only partially written) this wrong. ick.
- */
- BUG_ON(bch2_get_folio_disk_reservation(c, inode, folio, false));
-
- /*
- * This removes any writeable userspace mappings; we need to force
- * .page_mkwrite to be called again before any mmapped writes, to
- * redirty the full page:
- */
- folio_mkclean(folio);
- filemap_dirty_folio(mapping, folio);
-unlock:
- folio_unlock(folio);
- folio_put(folio);
-out:
- return ret;
-}
-
-static int bch2_truncate_folio(struct bch_inode_info *inode, loff_t from)
-{
- return __bch2_truncate_folio(inode, from >> PAGE_SHIFT,
- from, ANYSINT_MAX(loff_t));
-}
-
-static int bch2_truncate_folios(struct bch_inode_info *inode,
- loff_t start, loff_t end)
-{
- int ret = __bch2_truncate_folio(inode, start >> PAGE_SHIFT,
- start, end);
-
- if (ret >= 0 &&
- start >> PAGE_SHIFT != end >> PAGE_SHIFT)
- ret = __bch2_truncate_folio(inode,
- (end - 1) >> PAGE_SHIFT,
- start, end);
- return ret;
-}
-
-static int bch2_extend(struct mnt_idmap *idmap,
- struct bch_inode_info *inode,
- struct bch_inode_unpacked *inode_u,
- struct iattr *iattr)
-{
- struct address_space *mapping = inode->v.i_mapping;
- int ret;
-
- /*
- * sync appends:
- *
- * this has to be done _before_ extending i_size:
- */
- ret = filemap_write_and_wait_range(mapping, inode_u->bi_size, S64_MAX);
- if (ret)
- return ret;
-
- truncate_setsize(&inode->v, iattr->ia_size);
-
- return bch2_setattr_nonsize(idmap, inode, iattr);
-}
-
-int bchfs_truncate(struct mnt_idmap *idmap,
- struct bch_inode_info *inode, struct iattr *iattr)
-{
- struct bch_fs *c = inode->v.i_sb->s_fs_info;
- struct address_space *mapping = inode->v.i_mapping;
- struct bch_inode_unpacked inode_u;
- s64 i_sectors_delta = 0;
- int ret = 0;
-
- /*
- * If the truncate call with change the size of the file, the
- * cmtimes should be updated. If the size will not change, we
- * do not need to update the cmtimes.
- */
- if (iattr->ia_size != inode->v.i_size) {
- if (!(iattr->ia_valid & ATTR_MTIME))
- ktime_get_coarse_real_ts64(&iattr->ia_mtime);
- if (!(iattr->ia_valid & ATTR_CTIME))
- ktime_get_coarse_real_ts64(&iattr->ia_ctime);
- iattr->ia_valid |= ATTR_MTIME|ATTR_CTIME;
- }
-
- inode_dio_wait(&inode->v);
- bch2_pagecache_block_get(inode);
-
- ret = bch2_inode_find_by_inum(c, inode_inum(inode), &inode_u);
- if (ret)
- goto err;
-
- /*
- * check this before next assertion; on filesystem error our normal
- * invariants are a bit broken (truncate has to truncate the page cache
- * before the inode).
- */
- ret = bch2_journal_error(&c->journal);
- if (ret)
- goto err;
-
- WARN_ONCE(!test_bit(EI_INODE_ERROR, &inode->ei_flags) &&
- inode->v.i_size < inode_u.bi_size,
- "truncate spotted in mem i_size < btree i_size: %llu < %llu\n",
- (u64) inode->v.i_size, inode_u.bi_size);
-
- if (iattr->ia_size > inode->v.i_size) {
- ret = bch2_extend(idmap, inode, &inode_u, iattr);
- goto err;
- }
-
- iattr->ia_valid &= ~ATTR_SIZE;
-
- ret = bch2_truncate_folio(inode, iattr->ia_size);
- if (unlikely(ret < 0))
- goto err;
-
- truncate_setsize(&inode->v, iattr->ia_size);
-
- /*
- * When extending, we're going to write the new i_size to disk
- * immediately so we need to flush anything above the current on disk
- * i_size first:
- *
- * Also, when extending we need to flush the page that i_size currently
- * straddles - if it's mapped to userspace, we need to ensure that
- * userspace has to redirty it and call .mkwrite -> set_page_dirty
- * again to allocate the part of the page that was extended.
- */
- if (iattr->ia_size > inode_u.bi_size)
- ret = filemap_write_and_wait_range(mapping,
- inode_u.bi_size,
- iattr->ia_size - 1);
- else if (iattr->ia_size & (PAGE_SIZE - 1))
- ret = filemap_write_and_wait_range(mapping,
- round_down(iattr->ia_size, PAGE_SIZE),
- iattr->ia_size - 1);
- if (ret)
- goto err;
-
- ret = bch2_truncate(c, inode_inum(inode), iattr->ia_size, &i_sectors_delta);
- bch2_i_sectors_acct(c, inode, NULL, i_sectors_delta);
-
- if (unlikely(ret)) {
- /*
- * If we error here, VFS caches are now inconsistent with btree
- */
- set_bit(EI_INODE_ERROR, &inode->ei_flags);
- goto err;
- }
-
- bch2_fs_inconsistent_on(!inode->v.i_size && inode->v.i_blocks &&
- !bch2_journal_error(&c->journal), c,
- "inode %lu truncated to 0 but i_blocks %llu (ondisk %lli)",
- inode->v.i_ino, (u64) inode->v.i_blocks,
- inode->ei_inode.bi_sectors);
-
- ret = bch2_setattr_nonsize(idmap, inode, iattr);
-err:
- bch2_pagecache_block_put(inode);
- return bch2_err_class(ret);
-}
-
-/* fallocate: */
-
-static int inode_update_times_fn(struct btree_trans *trans,
- struct bch_inode_info *inode,
- struct bch_inode_unpacked *bi, void *p)
-{
- struct bch_fs *c = inode->v.i_sb->s_fs_info;
-
- bi->bi_mtime = bi->bi_ctime = bch2_current_time(c);
- return 0;
-}
-
-static long bchfs_fpunch(struct bch_inode_info *inode, loff_t offset, loff_t len)
-{
- struct bch_fs *c = inode->v.i_sb->s_fs_info;
- u64 end = offset + len;
- u64 block_start = round_up(offset, block_bytes(c));
- u64 block_end = round_down(end, block_bytes(c));
- bool truncated_last_page;
- int ret = 0;
-
- ret = bch2_truncate_folios(inode, offset, end);
- if (unlikely(ret < 0))
- goto err;
-
- truncated_last_page = ret;
-
- truncate_pagecache_range(&inode->v, offset, end - 1);
-
- if (block_start < block_end) {
- s64 i_sectors_delta = 0;
-
- ret = bch2_fpunch(c, inode_inum(inode),
- block_start >> 9, block_end >> 9,
- &i_sectors_delta);
- bch2_i_sectors_acct(c, inode, NULL, i_sectors_delta);
- }
-
- mutex_lock(&inode->ei_update_lock);
- if (end >= inode->v.i_size && !truncated_last_page) {
- ret = bch2_write_inode_size(c, inode, inode->v.i_size,
- ATTR_MTIME|ATTR_CTIME);
- } else {
- ret = bch2_write_inode(c, inode, inode_update_times_fn, NULL,
- ATTR_MTIME|ATTR_CTIME);
- }
- mutex_unlock(&inode->ei_update_lock);
-err:
- return ret;
-}
-
-static long bchfs_fcollapse_finsert(struct bch_inode_info *inode,
- loff_t offset, loff_t len,
- bool insert)
-{
- struct bch_fs *c = inode->v.i_sb->s_fs_info;
- struct address_space *mapping = inode->v.i_mapping;
- s64 i_sectors_delta = 0;
- int ret = 0;
-
- if ((offset | len) & (block_bytes(c) - 1))
- return -EINVAL;
-
- if (insert) {
- if (offset >= inode->v.i_size)
- return -EINVAL;
- } else {
- if (offset + len >= inode->v.i_size)
- return -EINVAL;
- }
-
- ret = bch2_write_invalidate_inode_pages_range(mapping, offset, LLONG_MAX);
- if (ret)
- return ret;
-
- if (insert)
- i_size_write(&inode->v, inode->v.i_size + len);
-
- ret = bch2_fcollapse_finsert(c, inode_inum(inode), offset >> 9, len >> 9,
- insert, &i_sectors_delta);
- if (!ret && !insert)
- i_size_write(&inode->v, inode->v.i_size - len);
- bch2_i_sectors_acct(c, inode, NULL, i_sectors_delta);
-
- return ret;
-}
-
-static int __bchfs_fallocate(struct bch_inode_info *inode, int mode,
- u64 start_sector, u64 end_sector)
-{
- struct bch_fs *c = inode->v.i_sb->s_fs_info;
- struct btree_trans *trans = bch2_trans_get(c);
- struct btree_iter iter;
- struct bpos end_pos = POS(inode->v.i_ino, end_sector);
- struct bch_io_opts opts;
- int ret = 0;
-
- bch2_inode_opts_get(&opts, c, &inode->ei_inode);
-
- bch2_trans_iter_init(trans, &iter, BTREE_ID_extents,
- POS(inode->v.i_ino, start_sector),
- BTREE_ITER_SLOTS|BTREE_ITER_INTENT);
-
- while (!ret && bkey_lt(iter.pos, end_pos)) {
- s64 i_sectors_delta = 0;
- struct quota_res quota_res = { 0 };
- struct bkey_s_c k;
- unsigned sectors;
- bool is_allocation;
- u64 hole_start, hole_end;
- u32 snapshot;
-
- bch2_trans_begin(trans);
-
- ret = bch2_subvolume_get_snapshot(trans,
- inode->ei_subvol, &snapshot);
- if (ret)
- goto bkey_err;
-
- bch2_btree_iter_set_snapshot(&iter, snapshot);
-
- k = bch2_btree_iter_peek_slot(&iter);
- if ((ret = bkey_err(k)))
- goto bkey_err;
-
- hole_start = iter.pos.offset;
- hole_end = bpos_min(k.k->p, end_pos).offset;
- is_allocation = bkey_extent_is_allocation(k.k);
-
- /* already reserved */
- if (bkey_extent_is_reservation(k) &&
- bch2_bkey_nr_ptrs_fully_allocated(k) >= opts.data_replicas) {
- bch2_btree_iter_advance(&iter);
- continue;
- }
-
- if (bkey_extent_is_data(k.k) &&
- !(mode & FALLOC_FL_ZERO_RANGE)) {
- bch2_btree_iter_advance(&iter);
- continue;
- }
-
- if (!(mode & FALLOC_FL_ZERO_RANGE)) {
- /*
- * Lock ordering - can't be holding btree locks while
- * blocking on a folio lock:
- */
- if (bch2_clamp_data_hole(&inode->v,
- &hole_start,
- &hole_end,
- opts.data_replicas, true))
- ret = drop_locks_do(trans,
- (bch2_clamp_data_hole(&inode->v,
- &hole_start,
- &hole_end,
- opts.data_replicas, false), 0));
- bch2_btree_iter_set_pos(&iter, POS(iter.pos.inode, hole_start));
-
- if (ret)
- goto bkey_err;
-
- if (hole_start == hole_end)
- continue;
- }
-
- sectors = hole_end - hole_start;
-
- if (!is_allocation) {
- ret = bch2_quota_reservation_add(c, inode,
- "a_res, sectors, true);
- if (unlikely(ret))
- goto bkey_err;
- }
-
- ret = bch2_extent_fallocate(trans, inode_inum(inode), &iter,
- sectors, opts, &i_sectors_delta,
- writepoint_hashed((unsigned long) current));
- if (ret)
- goto bkey_err;
-
- bch2_i_sectors_acct(c, inode, "a_res, i_sectors_delta);
-
- drop_locks_do(trans,
- (bch2_mark_pagecache_reserved(inode, hole_start, iter.pos.offset), 0));
-bkey_err:
- bch2_quota_reservation_put(c, inode, "a_res);
- if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
- ret = 0;
- }
-
- if (bch2_err_matches(ret, ENOSPC) && (mode & FALLOC_FL_ZERO_RANGE)) {
- struct quota_res quota_res = { 0 };
- s64 i_sectors_delta = 0;
-
- bch2_fpunch_at(trans, &iter, inode_inum(inode),
- end_sector, &i_sectors_delta);
- bch2_i_sectors_acct(c, inode, "a_res, i_sectors_delta);
- bch2_quota_reservation_put(c, inode, "a_res);
- }
-
- bch2_trans_iter_exit(trans, &iter);
- bch2_trans_put(trans);
- return ret;
-}
-
-static long bchfs_fallocate(struct bch_inode_info *inode, int mode,
- loff_t offset, loff_t len)
-{
- struct bch_fs *c = inode->v.i_sb->s_fs_info;
- u64 end = offset + len;
- u64 block_start = round_down(offset, block_bytes(c));
- u64 block_end = round_up(end, block_bytes(c));
- bool truncated_last_page = false;
- int ret, ret2 = 0;
-
- if (!(mode & FALLOC_FL_KEEP_SIZE) && end > inode->v.i_size) {
- ret = inode_newsize_ok(&inode->v, end);
- if (ret)
- return ret;
- }
-
- if (mode & FALLOC_FL_ZERO_RANGE) {
- ret = bch2_truncate_folios(inode, offset, end);
- if (unlikely(ret < 0))
- return ret;
-
- truncated_last_page = ret;
-
- truncate_pagecache_range(&inode->v, offset, end - 1);
-
- block_start = round_up(offset, block_bytes(c));
- block_end = round_down(end, block_bytes(c));
- }
-
- ret = __bchfs_fallocate(inode, mode, block_start >> 9, block_end >> 9);
-
- /*
- * On -ENOSPC in ZERO_RANGE mode, we still want to do the inode update,
- * so that the VFS cache i_size is consistent with the btree i_size:
- */
- if (ret &&
- !(bch2_err_matches(ret, ENOSPC) && (mode & FALLOC_FL_ZERO_RANGE)))
- return ret;
-
- if (mode & FALLOC_FL_KEEP_SIZE && end > inode->v.i_size)
- end = inode->v.i_size;
-
- if (end >= inode->v.i_size &&
- (((mode & FALLOC_FL_ZERO_RANGE) && !truncated_last_page) ||
- !(mode & FALLOC_FL_KEEP_SIZE))) {
- spin_lock(&inode->v.i_lock);
- i_size_write(&inode->v, end);
- spin_unlock(&inode->v.i_lock);
-
- mutex_lock(&inode->ei_update_lock);
- ret2 = bch2_write_inode_size(c, inode, end, 0);
- mutex_unlock(&inode->ei_update_lock);
- }
-
- return ret ?: ret2;
-}
-
-long bch2_fallocate_dispatch(struct file *file, int mode,
- loff_t offset, loff_t len)
-{
- struct bch_inode_info *inode = file_bch_inode(file);
- struct bch_fs *c = inode->v.i_sb->s_fs_info;
- long ret;
-
- if (!bch2_write_ref_tryget(c, BCH_WRITE_REF_fallocate))
- return -EROFS;
-
- inode_lock(&inode->v);
- inode_dio_wait(&inode->v);
- bch2_pagecache_block_get(inode);
-
- ret = file_modified(file);
- if (ret)
- goto err;
-
- if (!(mode & ~(FALLOC_FL_KEEP_SIZE|FALLOC_FL_ZERO_RANGE)))
- ret = bchfs_fallocate(inode, mode, offset, len);
- else if (mode == (FALLOC_FL_PUNCH_HOLE|FALLOC_FL_KEEP_SIZE))
- ret = bchfs_fpunch(inode, offset, len);
- else if (mode == FALLOC_FL_INSERT_RANGE)
- ret = bchfs_fcollapse_finsert(inode, offset, len, true);
- else if (mode == FALLOC_FL_COLLAPSE_RANGE)
- ret = bchfs_fcollapse_finsert(inode, offset, len, false);
- else
- ret = -EOPNOTSUPP;
-err:
- bch2_pagecache_block_put(inode);
- inode_unlock(&inode->v);
- bch2_write_ref_put(c, BCH_WRITE_REF_fallocate);
-
- return bch2_err_class(ret);
-}
-
-/*
- * Take a quota reservation for unallocated blocks in a given file range
- * Does not check pagecache
- */
-static int quota_reserve_range(struct bch_inode_info *inode,
- struct quota_res *res,
- u64 start, u64 end)
-{
- struct bch_fs *c = inode->v.i_sb->s_fs_info;
- struct btree_trans *trans = bch2_trans_get(c);
- struct btree_iter iter;
- struct bkey_s_c k;
- u32 snapshot;
- u64 sectors = end - start;
- u64 pos = start;
- int ret;
-retry:
- bch2_trans_begin(trans);
-
- ret = bch2_subvolume_get_snapshot(trans, inode->ei_subvol, &snapshot);
- if (ret)
- goto err;
-
- bch2_trans_iter_init(trans, &iter, BTREE_ID_extents,
- SPOS(inode->v.i_ino, pos, snapshot), 0);
-
- while (!(ret = btree_trans_too_many_iters(trans)) &&
- (k = bch2_btree_iter_peek_upto(&iter, POS(inode->v.i_ino, end - 1))).k &&
- !(ret = bkey_err(k))) {
- if (bkey_extent_is_allocation(k.k)) {
- u64 s = min(end, k.k->p.offset) -
- max(start, bkey_start_offset(k.k));
- BUG_ON(s > sectors);
- sectors -= s;
- }
- bch2_btree_iter_advance(&iter);
- }
- pos = iter.pos.offset;
- bch2_trans_iter_exit(trans, &iter);
-err:
- if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
- goto retry;
-
- bch2_trans_put(trans);
-
- return ret ?: bch2_quota_reservation_add(c, inode, res, sectors, true);
-}
-
-loff_t bch2_remap_file_range(struct file *file_src, loff_t pos_src,
- struct file *file_dst, loff_t pos_dst,
- loff_t len, unsigned remap_flags)
-{
- struct bch_inode_info *src = file_bch_inode(file_src);
- struct bch_inode_info *dst = file_bch_inode(file_dst);
- struct bch_fs *c = src->v.i_sb->s_fs_info;
- struct quota_res quota_res = { 0 };
- s64 i_sectors_delta = 0;
- u64 aligned_len;
- loff_t ret = 0;
-
- if (remap_flags & ~(REMAP_FILE_DEDUP|REMAP_FILE_ADVISORY))
- return -EINVAL;
-
- if (remap_flags & REMAP_FILE_DEDUP)
- return -EOPNOTSUPP;
-
- if ((pos_src & (block_bytes(c) - 1)) ||
- (pos_dst & (block_bytes(c) - 1)))
- return -EINVAL;
-
- if (src == dst &&
- abs(pos_src - pos_dst) < len)
- return -EINVAL;
-
- lock_two_nondirectories(&src->v, &dst->v);
- bch2_lock_inodes(INODE_PAGECACHE_BLOCK, src, dst);
-
- inode_dio_wait(&src->v);
- inode_dio_wait(&dst->v);
-
- ret = generic_remap_file_range_prep(file_src, pos_src,
- file_dst, pos_dst,
- &len, remap_flags);
- if (ret < 0 || len == 0)
- goto err;
-
- aligned_len = round_up((u64) len, block_bytes(c));
-
- ret = bch2_write_invalidate_inode_pages_range(dst->v.i_mapping,
- pos_dst, pos_dst + len - 1);
- if (ret)
- goto err;
-
- ret = quota_reserve_range(dst, "a_res, pos_dst >> 9,
- (pos_dst + aligned_len) >> 9);
- if (ret)
- goto err;
-
- file_update_time(file_dst);
-
- bch2_mark_pagecache_unallocated(src, pos_src >> 9,
- (pos_src + aligned_len) >> 9);
-
- ret = bch2_remap_range(c,
- inode_inum(dst), pos_dst >> 9,
- inode_inum(src), pos_src >> 9,
- aligned_len >> 9,
- pos_dst + len, &i_sectors_delta);
- if (ret < 0)
- goto err;
-
- /*
- * due to alignment, we might have remapped slightly more than requsted
- */
- ret = min((u64) ret << 9, (u64) len);
-
- bch2_i_sectors_acct(c, dst, "a_res, i_sectors_delta);
-
- spin_lock(&dst->v.i_lock);
- if (pos_dst + ret > dst->v.i_size)
- i_size_write(&dst->v, pos_dst + ret);
- spin_unlock(&dst->v.i_lock);
-
- if ((file_dst->f_flags & (__O_SYNC | O_DSYNC)) ||
- IS_SYNC(file_inode(file_dst)))
- ret = bch2_flush_inode(c, dst);
-err:
- bch2_quota_reservation_put(c, dst, "a_res);
- bch2_unlock_inodes(INODE_PAGECACHE_BLOCK, src, dst);
- unlock_two_nondirectories(&src->v, &dst->v);
-
- return bch2_err_class(ret);
-}
-
-/* fseek: */
-
-static loff_t bch2_seek_data(struct file *file, u64 offset)
-{
- struct bch_inode_info *inode = file_bch_inode(file);
- struct bch_fs *c = inode->v.i_sb->s_fs_info;
- struct btree_trans *trans;
- struct btree_iter iter;
- struct bkey_s_c k;
- subvol_inum inum = inode_inum(inode);
- u64 isize, next_data = MAX_LFS_FILESIZE;
- u32 snapshot;
- int ret;
-
- isize = i_size_read(&inode->v);
- if (offset >= isize)
- return -ENXIO;
-
- trans = bch2_trans_get(c);
-retry:
- bch2_trans_begin(trans);
-
- ret = bch2_subvolume_get_snapshot(trans, inum.subvol, &snapshot);
- if (ret)
- goto err;
-
- for_each_btree_key_upto_norestart(trans, iter, BTREE_ID_extents,
- SPOS(inode->v.i_ino, offset >> 9, snapshot),
- POS(inode->v.i_ino, U64_MAX),
- 0, k, ret) {
- if (bkey_extent_is_data(k.k)) {
- next_data = max(offset, bkey_start_offset(k.k) << 9);
- break;
- } else if (k.k->p.offset >> 9 > isize)
- break;
- }
- bch2_trans_iter_exit(trans, &iter);
-err:
- if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
- goto retry;
-
- bch2_trans_put(trans);
- if (ret)
- return ret;
-
- if (next_data > offset)
- next_data = bch2_seek_pagecache_data(&inode->v,
- offset, next_data, 0, false);
-
- if (next_data >= isize)
- return -ENXIO;
-
- return vfs_setpos(file, next_data, MAX_LFS_FILESIZE);
-}
-
-static loff_t bch2_seek_hole(struct file *file, u64 offset)
-{
- struct bch_inode_info *inode = file_bch_inode(file);
- struct bch_fs *c = inode->v.i_sb->s_fs_info;
- struct btree_trans *trans;
- struct btree_iter iter;
- struct bkey_s_c k;
- subvol_inum inum = inode_inum(inode);
- u64 isize, next_hole = MAX_LFS_FILESIZE;
- u32 snapshot;
- int ret;
-
- isize = i_size_read(&inode->v);
- if (offset >= isize)
- return -ENXIO;
-
- trans = bch2_trans_get(c);
-retry:
- bch2_trans_begin(trans);
-
- ret = bch2_subvolume_get_snapshot(trans, inum.subvol, &snapshot);
- if (ret)
- goto err;
-
- for_each_btree_key_norestart(trans, iter, BTREE_ID_extents,
- SPOS(inode->v.i_ino, offset >> 9, snapshot),
- BTREE_ITER_SLOTS, k, ret) {
- if (k.k->p.inode != inode->v.i_ino) {
- next_hole = bch2_seek_pagecache_hole(&inode->v,
- offset, MAX_LFS_FILESIZE, 0, false);
- break;
- } else if (!bkey_extent_is_data(k.k)) {
- next_hole = bch2_seek_pagecache_hole(&inode->v,
- max(offset, bkey_start_offset(k.k) << 9),
- k.k->p.offset << 9, 0, false);
-
- if (next_hole < k.k->p.offset << 9)
- break;
- } else {
- offset = max(offset, bkey_start_offset(k.k) << 9);
- }
- }
- bch2_trans_iter_exit(trans, &iter);
-err:
- if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
- goto retry;
-
- bch2_trans_put(trans);
- if (ret)
- return ret;
-
- if (next_hole > isize)
- next_hole = isize;
-
- return vfs_setpos(file, next_hole, MAX_LFS_FILESIZE);
-}
-
-loff_t bch2_llseek(struct file *file, loff_t offset, int whence)
-{
- loff_t ret;
-
- switch (whence) {
- case SEEK_SET:
- case SEEK_CUR:
- case SEEK_END:
- ret = generic_file_llseek(file, offset, whence);
- break;
- case SEEK_DATA:
- ret = bch2_seek_data(file, offset);
- break;
- case SEEK_HOLE:
- ret = bch2_seek_hole(file, offset);
- break;
- default:
- ret = -EINVAL;
- break;
- }
-
- return bch2_err_class(ret);
-}
-
-void bch2_fs_fsio_exit(struct bch_fs *c)
-{
- bioset_exit(&c->nocow_flush_bioset);
-}
-
-int bch2_fs_fsio_init(struct bch_fs *c)
-{
- if (bioset_init(&c->nocow_flush_bioset,
- 1, offsetof(struct nocow_flush, bio), 0))
- return -BCH_ERR_ENOMEM_nocow_flush_bioset_init;
-
- return 0;
-}
-
-#endif /* NO_BCACHEFS_FS */
projects / bcachefs-tools-debian / blobdiff