/* * inode.c - NILFS inode operations. * * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA * * Written by Ryusuke Konishi <ryusuke@osrg.net> * */ #include <linux/buffer_head.h> #include <linux/gfp.h> #include <linux/mpage.h> #include <linux/writeback.h> #include <linux/uio.h> #include "nilfs.h" #include "btnode.h" #include "segment.h" #include "page.h" #include "mdt.h" #include "cpfile.h" #include "ifile.h" struct nilfs_iget_args { u64 ino; __u64 cno; struct nilfs_root *root; int for_gc; }; void nilfs_inode_add_blocks(struct inode *inode, int n) { struct nilfs_root *root = NILFS_I(inode)->i_root; inode_add_bytes(inode, (1 << inode->i_blkbits) * n); if (root) atomic_add(n, &root->blocks_count); } void nilfs_inode_sub_blocks(struct inode *inode, int n) { struct nilfs_root *root = NILFS_I(inode)->i_root; inode_sub_bytes(inode, (1 << inode->i_blkbits) * n); if (root) atomic_sub(n, &root->blocks_count); } /** * nilfs_get_block() - get a file block on the filesystem (callback function) * @inode - inode struct of the target file * @blkoff - file block number * @bh_result - buffer head to be mapped on * @create - indicate whether allocating the block or not when it has not * been allocated yet. * * This function does not issue actual read request of the specified data * block. It is done by VFS. */ int nilfs_get_block(struct inode *inode, sector_t blkoff, struct buffer_head *bh_result, int create) { struct nilfs_inode_info *ii = NILFS_I(inode); __u64 blknum = 0; int err = 0, ret; struct inode *dat = NILFS_I_NILFS(inode)->ns_dat; unsigned maxblocks = bh_result->b_size >> inode->i_blkbits; down_read(&NILFS_MDT(dat)->mi_sem); ret = nilfs_bmap_lookup_contig(ii->i_bmap, blkoff, &blknum, maxblocks); up_read(&NILFS_MDT(dat)->mi_sem); if (ret >= 0) { /* found */ map_bh(bh_result, inode->i_sb, blknum); if (ret > 0) bh_result->b_size = (ret << inode->i_blkbits); goto out; } /* data block was not found */ if (ret == -ENOENT && create) { struct nilfs_transaction_info ti; bh_result->b_blocknr = 0; err = nilfs_transaction_begin(inode->i_sb, &ti, 1); if (unlikely(err)) goto out; err = nilfs_bmap_insert(ii->i_bmap, (unsigned long)blkoff, (unsigned long)bh_result); if (unlikely(err != 0)) { if (err == -EEXIST) { /* * The get_block() function could be called * from multiple callers for an inode. * However, the page having this block must * be locked in this case. */ printk(KERN_WARNING "nilfs_get_block: a race condition " "while inserting a data block. " "(inode number=%lu, file block " "offset=%llu)\n", inode->i_ino, (unsigned long long)blkoff); err = 0; } nilfs_transaction_abort(inode->i_sb); goto out; } nilfs_mark_inode_dirty(inode); nilfs_transaction_commit(inode->i_sb); /* never fails */ /* Error handling should be detailed */ set_buffer_new(bh_result); set_buffer_delay(bh_result); map_bh(bh_result, inode->i_sb, 0); /* dbn must be changed to proper value */ } else if (ret == -ENOENT) { /* not found is not error (e.g. hole); must return without the mapped state flag. */ ; } else { err = ret; } out: return err; } /** * nilfs_readpage() - implement readpage() method of nilfs_aops {} * address_space_operations. * @file - file struct of the file to be read * @page - the page to be read */ static int nilfs_readpage(struct file *file, struct page *page) { return mpage_readpage(page, nilfs_get_block); } /** * nilfs_readpages() - implement readpages() method of nilfs_aops {} * address_space_operations. * @file - file struct of the file to be read * @mapping - address_space struct used for reading multiple pages * @pages - the pages to be read * @nr_pages - number of pages to be read */ static int nilfs_readpages(struct file *file, struct address_space *mapping, struct list_head *pages, unsigned nr_pages) { return mpage_readpages(mapping, pages, nr_pages, nilfs_get_block); } static int nilfs_writepages(struct address_space *mapping, struct writeback_control *wbc) { struct inode *inode = mapping->host; int err = 0; if (wbc->sync_mode == WB_SYNC_ALL) err = nilfs_construct_dsync_segment(inode->i_sb, inode, wbc->range_start, wbc->range_end); return err; } static int nilfs_writepage(struct page *page, struct writeback_control *wbc) { struct inode *inode = page->mapping->host; int err; redirty_page_for_writepage(wbc, page); unlock_page(page); if (wbc->sync_mode == WB_SYNC_ALL) { err = nilfs_construct_segment(inode->i_sb); if (unlikely(err)) return err; } else if (wbc->for_reclaim) nilfs_flush_segment(inode->i_sb, inode->i_ino); return 0; } static int nilfs_set_page_dirty(struct page *page) { int ret = __set_page_dirty_buffers(page); if (ret) { struct inode *inode = page->mapping->host; unsigned nr_dirty = 1 << (PAGE_SHIFT - inode->i_blkbits); nilfs_set_file_dirty(inode, nr_dirty); } return ret; } static int nilfs_write_begin(struct file *file, struct address_space *mapping, loff_t pos, unsigned len, unsigned flags, struct page **pagep, void **fsdata) { struct inode *inode = mapping->host; int err = nilfs_transaction_begin(inode->i_sb, NULL, 1); if (unlikely(err)) return err; err = block_write_begin(mapping, pos, len, flags, pagep, nilfs_get_block); if (unlikely(err)) { loff_t isize = mapping->host->i_size; if (pos + len > isize) vmtruncate(mapping->host, isize); nilfs_transaction_abort(inode->i_sb); } return err; } static int nilfs_write_end(struct file *file, struct address_space *mapping, loff_t pos, unsigned len, unsigned copied, struct page *page, void *fsdata) { struct inode *inode = mapping->host; unsigned start = pos & (PAGE_CACHE_SIZE - 1); unsigned nr_dirty; int err; nr_dirty = nilfs_page_count_clean_buffers(page, start, start + copied); copied = generic_write_end(file, mapping, pos, len, copied, page, fsdata); nilfs_set_file_dirty(inode, nr_dirty); err = nilfs_transaction_commit(inode->i_sb); return err ? : copied; } static ssize_t nilfs_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov, loff_t offset, unsigned long nr_segs) { struct file *file = iocb->ki_filp; struct inode *inode = file->f_mapping->host; ssize_t size; if (rw == WRITE) return 0; /* Needs synchronization with the cleaner */ size = blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov, offset, nr_segs, nilfs_get_block, NULL); /* * In case of error extending write may have instantiated a few * blocks outside i_size. Trim these off again. */ if (unlikely((rw & WRITE) && size < 0)) { loff_t isize = i_size_read(inode); loff_t end = offset + iov_length(iov, nr_segs); if (end > isize) vmtruncate(inode, isize); } return size; } const struct address_space_operations nilfs_aops = { .writepage = nilfs_writepage, .readpage = nilfs_readpage, .sync_page = block_sync_page, .writepages = nilfs_writepages, .set_page_dirty = nilfs_set_page_dirty, .readpages = nilfs_readpages, .write_begin = nilfs_write_begin, .write_end = nilfs_write_end, /* .releasepage = nilfs_releasepage, */ .invalidatepage = block_invalidatepage, .direct_IO = nilfs_direct_IO, .is_partially_uptodate = block_is_partially_uptodate, }; struct inode *nilfs_new_inode(struct inode *dir, int mode) { struct super_block *sb = dir->i_sb; struct nilfs_sb_info *sbi = NILFS_SB(sb); struct inode *inode; struct nilfs_inode_info *ii; struct nilfs_root *root; int err = -ENOMEM; ino_t ino; inode = new_inode(sb); if (unlikely(!inode)) goto failed; mapping_set_gfp_mask(inode->i_mapping, mapping_gfp_mask(inode->i_mapping) & ~__GFP_FS); root = NILFS_I(dir)->i_root; ii = NILFS_I(inode); ii->i_state = 1 << NILFS_I_NEW; ii->i_root = root; err = nilfs_ifile_create_inode(root->ifile, &ino, &ii->i_bh); if (unlikely(err)) goto failed_ifile_create_inode; /* reference count of i_bh inherits from nilfs_mdt_read_block() */ atomic_inc(&root->inodes_count); inode_init_owner(inode, dir, mode); inode->i_ino = ino; inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) { err = nilfs_bmap_read(ii->i_bmap, NULL); if (err < 0) goto failed_bmap; set_bit(NILFS_I_BMAP, &ii->i_state); /* No lock is needed; iget() ensures it. */ } ii->i_flags = nilfs_mask_flags( mode, NILFS_I(dir)->i_flags & NILFS_FL_INHERITED); /* ii->i_file_acl = 0; */ /* ii->i_dir_acl = 0; */ ii->i_dir_start_lookup = 0; nilfs_set_inode_flags(inode); spin_lock(&sbi->s_next_gen_lock); inode->i_generation = sbi->s_next_generation++; spin_unlock(&sbi->s_next_gen_lock); insert_inode_hash(inode); err = nilfs_init_acl(inode, dir); if (unlikely(err)) goto failed_acl; /* never occur. When supporting nilfs_init_acl(), proper cancellation of above jobs should be considered */ return inode; failed_acl: failed_bmap: inode->i_nlink = 0; iput(inode); /* raw_inode will be deleted through generic_delete_inode() */ goto failed; failed_ifile_create_inode: make_bad_inode(inode); iput(inode); /* if i_nlink == 1, generic_forget_inode() will be called */ failed: return ERR_PTR(err); } void nilfs_set_inode_flags(struct inode *inode) { unsigned int flags = NILFS_I(inode)->i_flags; inode->i_flags &= ~(S_SYNC | S_APPEND | S_IMMUTABLE | S_NOATIME | S_DIRSYNC); if (flags & FS_SYNC_FL) inode->i_flags |= S_SYNC; if (flags & FS_APPEND_FL) inode->i_flags |= S_APPEND; if (flags & FS_IMMUTABLE_FL) inode->i_flags |= S_IMMUTABLE; if (flags & FS_NOATIME_FL) inode->i_flags |= S_NOATIME; if (flags & FS_DIRSYNC_FL) inode->i_flags |= S_DIRSYNC; mapping_set_gfp_mask(inode->i_mapping, mapping_gfp_mask(inode->i_mapping) & ~__GFP_FS); } int nilfs_read_inode_common(struct inode *inode, struct nilfs_inode *raw_inode) { struct nilfs_inode_info *ii = NILFS_I(inode); int err; inode->i_mode = le16_to_cpu(raw_inode->i_mode); inode->i_uid = (uid_t)le32_to_cpu(raw_inode->i_uid); inode->i_gid = (gid_t)le32_to_cpu(raw_inode->i_gid); inode->i_nlink = le16_to_cpu(raw_inode->i_links_count); inode->i_size = le64_to_cpu(raw_inode->i_size); inode->i_atime.tv_sec = le64_to_cpu(raw_inode->i_mtime); inode->i_ctime.tv_sec = le64_to_cpu(raw_inode->i_ctime); inode->i_mtime.tv_sec = le64_to_cpu(raw_inode->i_mtime); inode->i_atime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec); inode->i_ctime.tv_nsec = le32_to_cpu(raw_inode->i_ctime_nsec); inode->i_mtime.tv_nsec = le32_to_cpu(raw_inode->i_mtime_nsec); if (inode->i_nlink == 0 && inode->i_mode == 0) return -EINVAL; /* this inode is deleted */ inode->i_blocks = le64_to_cpu(raw_inode->i_blocks); ii->i_flags = le32_to_cpu(raw_inode->i_flags); #if 0 ii->i_file_acl = le32_to_cpu(raw_inode->i_file_acl); ii->i_dir_acl = S_ISREG(inode->i_mode) ? 0 : le32_to_cpu(raw_inode->i_dir_acl); #endif ii->i_dir_start_lookup = 0; inode->i_generation = le32_to_cpu(raw_inode->i_generation); if (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) { err = nilfs_bmap_read(ii->i_bmap, raw_inode); if (err < 0) return err; set_bit(NILFS_I_BMAP, &ii->i_state); /* No lock is needed; iget() ensures it. */ } return 0; } static int __nilfs_read_inode(struct super_block *sb, struct nilfs_root *root, unsigned long ino, struct inode *inode) { struct the_nilfs *nilfs = NILFS_SB(sb)->s_nilfs; struct buffer_head *bh; struct nilfs_inode *raw_inode; int err; down_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem); err = nilfs_ifile_get_inode_block(root->ifile, ino, &bh); if (unlikely(err)) goto bad_inode; raw_inode = nilfs_ifile_map_inode(root->ifile, ino, bh); err = nilfs_read_inode_common(inode, raw_inode); if (err) goto failed_unmap; if (S_ISREG(inode->i_mode)) { inode->i_op = &nilfs_file_inode_operations; inode->i_fop = &nilfs_file_operations; inode->i_mapping->a_ops = &nilfs_aops; } else if (S_ISDIR(inode->i_mode)) { inode->i_op = &nilfs_dir_inode_operations; inode->i_fop = &nilfs_dir_operations; inode->i_mapping->a_ops = &nilfs_aops; } else if (S_ISLNK(inode->i_mode)) { inode->i_op = &nilfs_symlink_inode_operations; inode->i_mapping->a_ops = &nilfs_aops; } else { inode->i_op = &nilfs_special_inode_operations; init_special_inode( inode, inode->i_mode, huge_decode_dev(le64_to_cpu(raw_inode->i_device_code))); } nilfs_ifile_unmap_inode(root->ifile, ino, bh); brelse(bh); up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem); nilfs_set_inode_flags(inode); return 0; failed_unmap: nilfs_ifile_unmap_inode(root->ifile, ino, bh); brelse(bh); bad_inode: up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem); return err; } static int nilfs_iget_test(struct inode *inode, void *opaque) { struct nilfs_iget_args *args = opaque; struct nilfs_inode_info *ii; if (args->ino != inode->i_ino || args->root != NILFS_I(inode)->i_root) return 0; ii = NILFS_I(inode); if (!test_bit(NILFS_I_GCINODE, &ii->i_state)) return !args->for_gc; return args->for_gc && args->cno == ii->i_cno; } static int nilfs_iget_set(struct inode *inode, void *opaque) { struct nilfs_iget_args *args = opaque; inode->i_ino = args->ino; if (args->for_gc) { NILFS_I(inode)->i_state = 1 << NILFS_I_GCINODE; NILFS_I(inode)->i_cno = args->cno; NILFS_I(inode)->i_root = NULL; } else { if (args->root && args->ino == NILFS_ROOT_INO) nilfs_get_root(args->root); NILFS_I(inode)->i_root = args->root; } return 0; } struct inode *nilfs_ilookup(struct super_block *sb, struct nilfs_root *root, unsigned long ino) { struct nilfs_iget_args args = { .ino = ino, .root = root, .cno = 0, .for_gc = 0 }; return ilookup5(sb, ino, nilfs_iget_test, &args); } struct inode *nilfs_iget_locked(struct super_block *sb, struct nilfs_root *root, unsigned long ino) { struct nilfs_iget_args args = { .ino = ino, .root = root, .cno = 0, .for_gc = 0 }; return iget5_locked(sb, ino, nilfs_iget_test, nilfs_iget_set, &args); } struct inode *nilfs_iget(struct super_block *sb, struct nilfs_root *root, unsigned long ino) { struct inode *inode; int err; inode = nilfs_iget_locked(sb, root, ino); if (unlikely(!inode)) return ERR_PTR(-ENOMEM); if (!(inode->i_state & I_NEW)) return inode; err = __nilfs_read_inode(sb, root, ino, inode); if (unlikely(err)) { iget_failed(inode); return ERR_PTR(err); } unlock_new_inode(inode); return inode; } struct inode *nilfs_iget_for_gc(struct super_block *sb, unsigned long ino, __u64 cno) { struct nilfs_iget_args args = { .ino = ino, .root = NULL, .cno = cno, .for_gc = 1 }; struct inode *inode; int err; inode = iget5_locked(sb, ino, nilfs_iget_test, nilfs_iget_set, &args); if (unlikely(!inode)) return ERR_PTR(-ENOMEM); if (!(inode->i_state & I_NEW)) return inode; err = nilfs_init_gcinode(inode); if (unlikely(err)) { iget_failed(inode); return ERR_PTR(err); } unlock_new_inode(inode); return inode; } void nilfs_write_inode_common(struct inode *inode, struct nilfs_inode *raw_inode, int has_bmap) { struct nilfs_inode_info *ii = NILFS_I(inode); raw_inode->i_mode = cpu_to_le16(inode->i_mode); raw_inode->i_uid = cpu_to_le32(inode->i_uid); raw_inode->i_gid = cpu_to_le32(inode->i_gid); raw_inode->i_links_count = cpu_to_le16(inode->i_nlink); raw_inode->i_size = cpu_to_le64(inode->i_size); raw_inode->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec); raw_inode->i_mtime = cpu_to_le64(inode->i_mtime.tv_sec); raw_inode->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec); raw_inode->i_mtime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec); raw_inode->i_blocks = cpu_to_le64(inode->i_blocks); raw_inode->i_flags = cpu_to_le32(ii->i_flags); raw_inode->i_generation = cpu_to_le32(inode->i_generation); if (has_bmap) nilfs_bmap_write(ii->i_bmap, raw_inode); else if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) raw_inode->i_device_code = cpu_to_le64(huge_encode_dev(inode->i_rdev)); /* When extending inode, nilfs->ns_inode_size should be checked for substitutions of appended fields */ } void nilfs_update_inode(struct inode *inode, struct buffer_head *ibh) { ino_t ino = inode->i_ino; struct nilfs_inode_info *ii = NILFS_I(inode); struct inode *ifile = ii->i_root->ifile; struct nilfs_inode *raw_inode; raw_inode = nilfs_ifile_map_inode(ifile, ino, ibh); if (test_and_clear_bit(NILFS_I_NEW, &ii->i_state)) memset(raw_inode, 0, NILFS_MDT(ifile)->mi_entry_size); set_bit(NILFS_I_INODE_DIRTY, &ii->i_state); nilfs_write_inode_common(inode, raw_inode, 0); /* XXX: call with has_bmap = 0 is a workaround to avoid deadlock of bmap. This delays update of i_bmap to just before writing */ nilfs_ifile_unmap_inode(ifile, ino, ibh); } #define NILFS_MAX_TRUNCATE_BLOCKS 16384 /* 64MB for 4KB block */ static void nilfs_truncate_bmap(struct nilfs_inode_info *ii, unsigned long from) { unsigned long b; int ret; if (!test_bit(NILFS_I_BMAP, &ii->i_state)) return; repeat: ret = nilfs_bmap_last_key(ii->i_bmap, &b); if (ret == -ENOENT) return; else if (ret < 0) goto failed; if (b < from) return; b -= min_t(unsigned long, NILFS_MAX_TRUNCATE_BLOCKS, b - from); ret = nilfs_bmap_truncate(ii->i_bmap, b); nilfs_relax_pressure_in_lock(ii->vfs_inode.i_sb); if (!ret || (ret == -ENOMEM && nilfs_bmap_truncate(ii->i_bmap, b) == 0)) goto repeat; failed: nilfs_warning(ii->vfs_inode.i_sb, __func__, "failed to truncate bmap (ino=%lu, err=%d)", ii->vfs_inode.i_ino, ret); } void nilfs_truncate(struct inode *inode) { unsigned long blkoff; unsigned int blocksize; struct nilfs_transaction_info ti; struct super_block *sb = inode->i_sb; struct nilfs_inode_info *ii = NILFS_I(inode); if (!test_bit(NILFS_I_BMAP, &ii->i_state)) return; if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) return; blocksize = sb->s_blocksize; blkoff = (inode->i_size + blocksize - 1) >> sb->s_blocksize_bits; nilfs_transaction_begin(sb, &ti, 0); /* never fails */ block_truncate_page(inode->i_mapping, inode->i_size, nilfs_get_block); nilfs_truncate_bmap(ii, blkoff); inode->i_mtime = inode->i_ctime = CURRENT_TIME; if (IS_SYNC(inode)) nilfs_set_transaction_flag(NILFS_TI_SYNC); nilfs_mark_inode_dirty(inode); nilfs_set_file_dirty(inode, 0); nilfs_transaction_commit(sb); /* May construct a logical segment and may fail in sync mode. But truncate has no return value. */ } static void nilfs_clear_inode(struct inode *inode) { struct nilfs_inode_info *ii = NILFS_I(inode); struct nilfs_mdt_info *mdi = NILFS_MDT(inode); /* * Free resources allocated in nilfs_read_inode(), here. */ BUG_ON(!list_empty(&ii->i_dirty)); brelse(ii->i_bh); ii->i_bh = NULL; if (mdi && mdi->mi_palloc_cache) nilfs_palloc_destroy_cache(inode); if (test_bit(NILFS_I_BMAP, &ii->i_state)) nilfs_bmap_clear(ii->i_bmap); nilfs_btnode_cache_clear(&ii->i_btnode_cache); if (ii->i_root && inode->i_ino == NILFS_ROOT_INO) nilfs_put_root(ii->i_root); } void nilfs_evict_inode(struct inode *inode) { struct nilfs_transaction_info ti; struct super_block *sb = inode->i_sb; struct nilfs_inode_info *ii = NILFS_I(inode); int ret; if (inode->i_nlink || !ii->i_root || unlikely(is_bad_inode(inode))) { if (inode->i_data.nrpages) truncate_inode_pages(&inode->i_data, 0); end_writeback(inode); nilfs_clear_inode(inode); return; } nilfs_transaction_begin(sb, &ti, 0); /* never fails */ if (inode->i_data.nrpages) truncate_inode_pages(&inode->i_data, 0); /* TODO: some of the following operations may fail. */ nilfs_truncate_bmap(ii, 0); nilfs_mark_inode_dirty(inode); end_writeback(inode); ret = nilfs_ifile_delete_inode(ii->i_root->ifile, inode->i_ino); if (!ret) atomic_dec(&ii->i_root->inodes_count); nilfs_clear_inode(inode); if (IS_SYNC(inode)) nilfs_set_transaction_flag(NILFS_TI_SYNC); nilfs_transaction_commit(sb); /* May construct a logical segment and may fail in sync mode. But delete_inode has no return value. */ } int nilfs_setattr(struct dentry *dentry, struct iattr *iattr) { struct nilfs_transaction_info ti; struct inode *inode = dentry->d_inode; struct super_block *sb = inode->i_sb; int err; err = inode_change_ok(inode, iattr); if (err) return err; err = nilfs_transaction_begin(sb, &ti, 0); if (unlikely(err)) return err; if ((iattr->ia_valid & ATTR_SIZE) && iattr->ia_size != i_size_read(inode)) { err = vmtruncate(inode, iattr->ia_size); if (unlikely(err)) goto out_err; } setattr_copy(inode, iattr); mark_inode_dirty(inode); if (iattr->ia_valid & ATTR_MODE) { err = nilfs_acl_chmod(inode); if (unlikely(err)) goto out_err; } return nilfs_transaction_commit(sb); out_err: nilfs_transaction_abort(sb); return err; } int nilfs_permission(struct inode *inode, int mask, unsigned int flags) { struct nilfs_root *root; if (flags & IPERM_FLAG_RCU) return -ECHILD; root = NILFS_I(inode)->i_root; if ((mask & MAY_WRITE) && root && root->cno != NILFS_CPTREE_CURRENT_CNO) return -EROFS; /* snapshot is not writable */ return generic_permission(inode, mask, flags, NULL); } int nilfs_load_inode_block(struct inode *inode, struct buffer_head **pbh) { struct nilfs_sb_info *sbi = NILFS_SB(inode->i_sb); struct nilfs_inode_info *ii = NILFS_I(inode); int err; spin_lock(&sbi->s_inode_lock); if (ii->i_bh == NULL) { spin_unlock(&sbi->s_inode_lock); err = nilfs_ifile_get_inode_block(ii->i_root->ifile, inode->i_ino, pbh); if (unlikely(err)) return err; spin_lock(&sbi->s_inode_lock); if (ii->i_bh == NULL) ii->i_bh = *pbh; else { brelse(*pbh); *pbh = ii->i_bh; } } else *pbh = ii->i_bh; get_bh(*pbh); spin_unlock(&sbi->s_inode_lock); return 0; } int nilfs_inode_dirty(struct inode *inode) { struct nilfs_inode_info *ii = NILFS_I(inode); struct nilfs_sb_info *sbi = NILFS_SB(inode->i_sb); int ret = 0; if (!list_empty(&ii->i_dirty)) { spin_lock(&sbi->s_inode_lock); ret = test_bit(NILFS_I_DIRTY, &ii->i_state) || test_bit(NILFS_I_BUSY, &ii->i_state); spin_unlock(&sbi->s_inode_lock); } return ret; } int nilfs_set_file_dirty(struct inode *inode, unsigned nr_dirty) { struct nilfs_sb_info *sbi = NILFS_SB(inode->i_sb); struct nilfs_inode_info *ii = NILFS_I(inode); atomic_add(nr_dirty, &sbi->s_nilfs->ns_ndirtyblks); if (test_and_set_bit(NILFS_I_DIRTY, &ii->i_state)) return 0; spin_lock(&sbi->s_inode_lock); if (!test_bit(NILFS_I_QUEUED, &ii->i_state) && !test_bit(NILFS_I_BUSY, &ii->i_state)) { /* Because this routine may race with nilfs_dispose_list(), we have to check NILFS_I_QUEUED here, too. */ if (list_empty(&ii->i_dirty) && igrab(inode) == NULL) { /* This will happen when somebody is freeing this inode. */ nilfs_warning(sbi->s_super, __func__, "cannot get inode (ino=%lu)\n", inode->i_ino); spin_unlock(&sbi->s_inode_lock); return -EINVAL; /* NILFS_I_DIRTY may remain for freeing inode */ } list_del(&ii->i_dirty); list_add_tail(&ii->i_dirty, &sbi->s_dirty_files); set_bit(NILFS_I_QUEUED, &ii->i_state); } spin_unlock(&sbi->s_inode_lock); return 0; } int nilfs_mark_inode_dirty(struct inode *inode) { struct buffer_head *ibh; int err; err = nilfs_load_inode_block(inode, &ibh); if (unlikely(err)) { nilfs_warning(inode->i_sb, __func__, "failed to reget inode block.\n"); return err; } nilfs_update_inode(inode, ibh); nilfs_mdt_mark_buffer_dirty(ibh); nilfs_mdt_mark_dirty(NILFS_I(inode)->i_root->ifile); brelse(ibh); return 0; } /** * nilfs_dirty_inode - reflect changes on given inode to an inode block. * @inode: inode of the file to be registered. * * nilfs_dirty_inode() loads a inode block containing the specified * @inode and copies data from a nilfs_inode to a corresponding inode * entry in the inode block. This operation is excluded from the segment * construction. This function can be called both as a single operation * and as a part of indivisible file operations. */ void nilfs_dirty_inode(struct inode *inode) { struct nilfs_transaction_info ti; struct nilfs_mdt_info *mdi = NILFS_MDT(inode); if (is_bad_inode(inode)) { nilfs_warning(inode->i_sb, __func__, "tried to mark bad_inode dirty. ignored.\n"); dump_stack(); return; } if (mdi) { nilfs_mdt_mark_dirty(inode); return; } nilfs_transaction_begin(inode->i_sb, &ti, 0); nilfs_mark_inode_dirty(inode); nilfs_transaction_commit(inode->i_sb); /* never fails */ } int nilfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, __u64 start, __u64 len) { struct the_nilfs *nilfs = NILFS_I_NILFS(inode); __u64 logical = 0, phys = 0, size = 0; __u32 flags = 0; loff_t isize; sector_t blkoff, end_blkoff; sector_t delalloc_blkoff; unsigned long delalloc_blklen; unsigned int blkbits = inode->i_blkbits; int ret, n; ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC); if (ret) return ret; mutex_lock(&inode->i_mutex); isize = i_size_read(inode); blkoff = start >> blkbits; end_blkoff = (start + len - 1) >> blkbits; delalloc_blklen = nilfs_find_uncommitted_extent(inode, blkoff, &delalloc_blkoff); do { __u64 blkphy; unsigned int maxblocks; if (delalloc_blklen && blkoff == delalloc_blkoff) { if (size) { /* End of the current extent */ ret = fiemap_fill_next_extent( fieinfo, logical, phys, size, flags); if (ret) break; } if (blkoff > end_blkoff) break; flags = FIEMAP_EXTENT_MERGED | FIEMAP_EXTENT_DELALLOC; logical = blkoff << blkbits; phys = 0; size = delalloc_blklen << blkbits; blkoff = delalloc_blkoff + delalloc_blklen; delalloc_blklen = nilfs_find_uncommitted_extent( inode, blkoff, &delalloc_blkoff); continue; } /* * Limit the number of blocks that we look up so as * not to get into the next delayed allocation extent. */ maxblocks = INT_MAX; if (delalloc_blklen) maxblocks = min_t(sector_t, delalloc_blkoff - blkoff, maxblocks); blkphy = 0; down_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem); n = nilfs_bmap_lookup_contig( NILFS_I(inode)->i_bmap, blkoff, &blkphy, maxblocks); up_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem); if (n < 0) { int past_eof; if (unlikely(n != -ENOENT)) break; /* error */ /* HOLE */ blkoff++; past_eof = ((blkoff << blkbits) >= isize); if (size) { /* End of the current extent */ if (past_eof) flags |= FIEMAP_EXTENT_LAST; ret = fiemap_fill_next_extent( fieinfo, logical, phys, size, flags); if (ret) break; size = 0; } if (blkoff > end_blkoff || past_eof) break; } else { if (size) { if (phys && blkphy << blkbits == phys + size) { /* The current extent goes on */ size += n << blkbits; } else { /* Terminate the current extent */ ret = fiemap_fill_next_extent( fieinfo, logical, phys, size, flags); if (ret || blkoff > end_blkoff) break; /* Start another extent */ flags = FIEMAP_EXTENT_MERGED; logical = blkoff << blkbits; phys = blkphy << blkbits; size = n << blkbits; } } else { /* Start a new extent */ flags = FIEMAP_EXTENT_MERGED; logical = blkoff << blkbits; phys = blkphy << blkbits; size = n << blkbits; } blkoff += n; } cond_resched(); } while (true); /* If ret is 1 then we just hit the end of the extent array */ if (ret == 1) ret = 0; mutex_unlock(&inode->i_mutex); return ret; }