linux-stable/fs/nilfs2/inode.c
Christian Brauner f2d40141d5
fs: port inode_init_owner() to mnt_idmap
Convert to struct mnt_idmap.

Last cycle we merged the necessary infrastructure in
256c8aed2b ("fs: introduce dedicated idmap type for mounts").
This is just the conversion to struct mnt_idmap.

Currently we still pass around the plain namespace that was attached to a
mount. This is in general pretty convenient but it makes it easy to
conflate namespaces that are relevant on the filesystem with namespaces
that are relevent on the mount level. Especially for non-vfs developers
without detailed knowledge in this area this can be a potential source for
bugs.

Once the conversion to struct mnt_idmap is done all helpers down to the
really low-level helpers will take a struct mnt_idmap argument instead of
two namespace arguments. This way it becomes impossible to conflate the two
eliminating the possibility of any bugs. All of the vfs and all filesystems
only operate on struct mnt_idmap.

Acked-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Christian Brauner (Microsoft) <brauner@kernel.org>
2023-01-19 09:24:28 +01:00

1263 lines
33 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* NILFS inode operations.
*
* Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
*
* Written by Ryusuke Konishi.
*
*/
#include <linux/buffer_head.h>
#include <linux/gfp.h>
#include <linux/mpage.h>
#include <linux/pagemap.h>
#include <linux/writeback.h>
#include <linux/uio.h>
#include <linux/fiemap.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 - arguments used during comparison between inodes
* @ino: inode number
* @cno: checkpoint number
* @root: pointer on NILFS root object (mounted checkpoint)
* @for_gc: inode for GC flag
* @for_btnc: inode for B-tree node cache flag
* @for_shadow: inode for shadowed page cache flag
*/
struct nilfs_iget_args {
u64 ino;
__u64 cno;
struct nilfs_root *root;
bool for_gc;
bool for_btnc;
bool for_shadow;
};
static int nilfs_iget_test(struct inode *inode, void *opaque);
void nilfs_inode_add_blocks(struct inode *inode, int n)
{
struct nilfs_root *root = NILFS_I(inode)->i_root;
inode_add_bytes(inode, i_blocksize(inode) * n);
if (root)
atomic64_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, i_blocksize(inode) * n);
if (root)
atomic64_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);
struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
__u64 blknum = 0;
int err = 0, ret;
unsigned int maxblocks = bh_result->b_size >> inode->i_blkbits;
down_read(&NILFS_MDT(nilfs->ns_dat)->mi_sem);
ret = nilfs_bmap_lookup_contig(ii->i_bmap, blkoff, &blknum, maxblocks);
up_read(&NILFS_MDT(nilfs->ns_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, 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.
*/
nilfs_warn(inode->i_sb,
"%s (ino=%lu): a race condition while inserting a data block at offset=%llu",
__func__, inode->i_ino,
(unsigned long long)blkoff);
err = 0;
}
nilfs_transaction_abort(inode->i_sb);
goto out;
}
nilfs_mark_inode_dirty_sync(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);
/* Disk block number 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_read_folio() - implement read_folio() method of nilfs_aops {}
* address_space_operations.
* @file: file struct of the file to be read
* @folio: the folio to be read
*/
static int nilfs_read_folio(struct file *file, struct folio *folio)
{
return mpage_read_folio(folio, nilfs_get_block);
}
static void nilfs_readahead(struct readahead_control *rac)
{
mpage_readahead(rac, nilfs_get_block);
}
static int nilfs_writepages(struct address_space *mapping,
struct writeback_control *wbc)
{
struct inode *inode = mapping->host;
int err = 0;
if (sb_rdonly(inode->i_sb)) {
nilfs_clear_dirty_pages(mapping, false);
return -EROFS;
}
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;
if (sb_rdonly(inode->i_sb)) {
/*
* It means that filesystem was remounted in read-only
* mode because of error or metadata corruption. But we
* have dirty pages that try to be flushed in background.
* So, here we simply discard this dirty page.
*/
nilfs_clear_dirty_page(page, false);
unlock_page(page);
return -EROFS;
}
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 bool nilfs_dirty_folio(struct address_space *mapping,
struct folio *folio)
{
struct inode *inode = mapping->host;
struct buffer_head *head;
unsigned int nr_dirty = 0;
bool ret = filemap_dirty_folio(mapping, folio);
/*
* The page may not be locked, eg if called from try_to_unmap_one()
*/
spin_lock(&mapping->private_lock);
head = folio_buffers(folio);
if (head) {
struct buffer_head *bh = head;
do {
/* Do not mark hole blocks dirty */
if (buffer_dirty(bh) || !buffer_mapped(bh))
continue;
set_buffer_dirty(bh);
nr_dirty++;
} while (bh = bh->b_this_page, bh != head);
} else if (ret) {
nr_dirty = 1 << (folio_shift(folio) - inode->i_blkbits);
}
spin_unlock(&mapping->private_lock);
if (nr_dirty)
nilfs_set_file_dirty(inode, nr_dirty);
return ret;
}
void nilfs_write_failed(struct address_space *mapping, loff_t to)
{
struct inode *inode = mapping->host;
if (to > inode->i_size) {
truncate_pagecache(inode, inode->i_size);
nilfs_truncate(inode);
}
}
static int nilfs_write_begin(struct file *file, struct address_space *mapping,
loff_t pos, unsigned len,
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, pagep, nilfs_get_block);
if (unlikely(err)) {
nilfs_write_failed(mapping, pos + len);
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 int start = pos & (PAGE_SIZE - 1);
unsigned int 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(struct kiocb *iocb, struct iov_iter *iter)
{
struct inode *inode = file_inode(iocb->ki_filp);
if (iov_iter_rw(iter) == WRITE)
return 0;
/* Needs synchronization with the cleaner */
return blockdev_direct_IO(iocb, inode, iter, nilfs_get_block);
}
const struct address_space_operations nilfs_aops = {
.writepage = nilfs_writepage,
.read_folio = nilfs_read_folio,
.writepages = nilfs_writepages,
.dirty_folio = nilfs_dirty_folio,
.readahead = nilfs_readahead,
.write_begin = nilfs_write_begin,
.write_end = nilfs_write_end,
.invalidate_folio = block_invalidate_folio,
.direct_IO = nilfs_direct_IO,
.is_partially_uptodate = block_is_partially_uptodate,
};
static int nilfs_insert_inode_locked(struct inode *inode,
struct nilfs_root *root,
unsigned long ino)
{
struct nilfs_iget_args args = {
.ino = ino, .root = root, .cno = 0, .for_gc = false,
.for_btnc = false, .for_shadow = false
};
return insert_inode_locked4(inode, ino, nilfs_iget_test, &args);
}
struct inode *nilfs_new_inode(struct inode *dir, umode_t mode)
{
struct super_block *sb = dir->i_sb;
struct the_nilfs *nilfs = sb->s_fs_info;
struct inode *inode;
struct nilfs_inode_info *ii;
struct nilfs_root *root;
struct buffer_head *bh;
int err = -ENOMEM;
ino_t ino;
inode = new_inode(sb);
if (unlikely(!inode))
goto failed;
mapping_set_gfp_mask(inode->i_mapping,
mapping_gfp_constraint(inode->i_mapping, ~__GFP_FS));
root = NILFS_I(dir)->i_root;
ii = NILFS_I(inode);
ii->i_state = BIT(NILFS_I_NEW);
ii->i_root = root;
err = nilfs_ifile_create_inode(root->ifile, &ino, &bh);
if (unlikely(err))
goto failed_ifile_create_inode;
/* reference count of i_bh inherits from nilfs_mdt_read_block() */
if (unlikely(ino < NILFS_USER_INO)) {
nilfs_warn(sb,
"inode bitmap is inconsistent for reserved inodes");
do {
brelse(bh);
err = nilfs_ifile_create_inode(root->ifile, &ino, &bh);
if (unlikely(err))
goto failed_ifile_create_inode;
} while (ino < NILFS_USER_INO);
nilfs_info(sb, "repaired inode bitmap for reserved inodes");
}
ii->i_bh = bh;
atomic64_inc(&root->inodes_count);
inode_init_owner(&nop_mnt_idmap, inode, dir, mode);
inode->i_ino = ino;
inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) {
err = nilfs_bmap_read(ii->i_bmap, NULL);
if (err < 0)
goto failed_after_creation;
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(&nilfs->ns_next_gen_lock);
inode->i_generation = nilfs->ns_next_generation++;
spin_unlock(&nilfs->ns_next_gen_lock);
if (nilfs_insert_inode_locked(inode, root, ino) < 0) {
err = -EIO;
goto failed_after_creation;
}
err = nilfs_init_acl(inode, dir);
if (unlikely(err))
/*
* Never occur. When supporting nilfs_init_acl(),
* proper cancellation of above jobs should be considered.
*/
goto failed_after_creation;
return inode;
failed_after_creation:
clear_nlink(inode);
if (inode->i_state & I_NEW)
unlock_new_inode(inode);
iput(inode); /*
* raw_inode will be deleted through
* nilfs_evict_inode().
*/
goto failed;
failed_ifile_create_inode:
make_bad_inode(inode);
iput(inode);
failed:
return ERR_PTR(err);
}
void nilfs_set_inode_flags(struct inode *inode)
{
unsigned int flags = NILFS_I(inode)->i_flags;
unsigned int new_fl = 0;
if (flags & FS_SYNC_FL)
new_fl |= S_SYNC;
if (flags & FS_APPEND_FL)
new_fl |= S_APPEND;
if (flags & FS_IMMUTABLE_FL)
new_fl |= S_IMMUTABLE;
if (flags & FS_NOATIME_FL)
new_fl |= S_NOATIME;
if (flags & FS_DIRSYNC_FL)
new_fl |= S_DIRSYNC;
inode_set_flags(inode, new_fl, S_SYNC | S_APPEND | S_IMMUTABLE |
S_NOATIME | S_DIRSYNC);
}
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);
i_uid_write(inode, le32_to_cpu(raw_inode->i_uid));
i_gid_write(inode, le32_to_cpu(raw_inode->i_gid));
set_nlink(inode, 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 (nilfs_is_metadata_file_inode(inode) && !S_ISREG(inode->i_mode))
return -EIO; /* this inode is for metadata and corrupted */
if (inode->i_nlink == 0)
return -ESTALE; /* 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 = sb->s_fs_info;
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_nohighmem(inode);
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);
mapping_set_gfp_mask(inode->i_mapping,
mapping_gfp_constraint(inode->i_mapping, ~__GFP_FS));
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_BTNC, &ii->i_state)) {
if (!args->for_btnc)
return 0;
} else if (args->for_btnc) {
return 0;
}
if (test_bit(NILFS_I_SHADOW, &ii->i_state)) {
if (!args->for_shadow)
return 0;
} else if (args->for_shadow) {
return 0;
}
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;
NILFS_I(inode)->i_cno = args->cno;
NILFS_I(inode)->i_root = args->root;
if (args->root && args->ino == NILFS_ROOT_INO)
nilfs_get_root(args->root);
if (args->for_gc)
NILFS_I(inode)->i_state = BIT(NILFS_I_GCINODE);
if (args->for_btnc)
NILFS_I(inode)->i_state |= BIT(NILFS_I_BTNC);
if (args->for_shadow)
NILFS_I(inode)->i_state |= BIT(NILFS_I_SHADOW);
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 = false,
.for_btnc = false, .for_shadow = false
};
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 = false,
.for_btnc = false, .for_shadow = false
};
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 = true,
.for_btnc = false, .for_shadow = false
};
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;
}
/**
* nilfs_attach_btree_node_cache - attach a B-tree node cache to the inode
* @inode: inode object
*
* nilfs_attach_btree_node_cache() attaches a B-tree node cache to @inode,
* or does nothing if the inode already has it. This function allocates
* an additional inode to maintain page cache of B-tree nodes one-on-one.
*
* Return Value: On success, 0 is returned. On errors, one of the following
* negative error code is returned.
*
* %-ENOMEM - Insufficient memory available.
*/
int nilfs_attach_btree_node_cache(struct inode *inode)
{
struct nilfs_inode_info *ii = NILFS_I(inode);
struct inode *btnc_inode;
struct nilfs_iget_args args;
if (ii->i_assoc_inode)
return 0;
args.ino = inode->i_ino;
args.root = ii->i_root;
args.cno = ii->i_cno;
args.for_gc = test_bit(NILFS_I_GCINODE, &ii->i_state) != 0;
args.for_btnc = true;
args.for_shadow = test_bit(NILFS_I_SHADOW, &ii->i_state) != 0;
btnc_inode = iget5_locked(inode->i_sb, inode->i_ino, nilfs_iget_test,
nilfs_iget_set, &args);
if (unlikely(!btnc_inode))
return -ENOMEM;
if (btnc_inode->i_state & I_NEW) {
nilfs_init_btnc_inode(btnc_inode);
unlock_new_inode(btnc_inode);
}
NILFS_I(btnc_inode)->i_assoc_inode = inode;
NILFS_I(btnc_inode)->i_bmap = ii->i_bmap;
ii->i_assoc_inode = btnc_inode;
return 0;
}
/**
* nilfs_detach_btree_node_cache - detach the B-tree node cache from the inode
* @inode: inode object
*
* nilfs_detach_btree_node_cache() detaches the B-tree node cache and its
* holder inode bound to @inode, or does nothing if @inode doesn't have it.
*/
void nilfs_detach_btree_node_cache(struct inode *inode)
{
struct nilfs_inode_info *ii = NILFS_I(inode);
struct inode *btnc_inode = ii->i_assoc_inode;
if (btnc_inode) {
NILFS_I(btnc_inode)->i_assoc_inode = NULL;
ii->i_assoc_inode = NULL;
iput(btnc_inode);
}
}
/**
* nilfs_iget_for_shadow - obtain inode for shadow mapping
* @inode: inode object that uses shadow mapping
*
* nilfs_iget_for_shadow() allocates a pair of inodes that holds page
* caches for shadow mapping. The page cache for data pages is set up
* in one inode and the one for b-tree node pages is set up in the
* other inode, which is attached to the former inode.
*
* Return Value: On success, a pointer to the inode for data pages is
* returned. On errors, one of the following negative error code is returned
* in a pointer type.
*
* %-ENOMEM - Insufficient memory available.
*/
struct inode *nilfs_iget_for_shadow(struct inode *inode)
{
struct nilfs_iget_args args = {
.ino = inode->i_ino, .root = NULL, .cno = 0, .for_gc = false,
.for_btnc = false, .for_shadow = true
};
struct inode *s_inode;
int err;
s_inode = iget5_locked(inode->i_sb, inode->i_ino, nilfs_iget_test,
nilfs_iget_set, &args);
if (unlikely(!s_inode))
return ERR_PTR(-ENOMEM);
if (!(s_inode->i_state & I_NEW))
return inode;
NILFS_I(s_inode)->i_flags = 0;
memset(NILFS_I(s_inode)->i_bmap, 0, sizeof(struct nilfs_bmap));
mapping_set_gfp_mask(s_inode->i_mapping, GFP_NOFS);
err = nilfs_attach_btree_node_cache(s_inode);
if (unlikely(err)) {
iget_failed(s_inode);
return ERR_PTR(err);
}
unlock_new_inode(s_inode);
return s_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(i_uid_read(inode));
raw_inode->i_gid = cpu_to_le32(i_gid_read(inode));
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 (NILFS_ROOT_METADATA_FILE(inode->i_ino)) {
struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
/* zero-fill unused portion in the case of super root block */
raw_inode->i_xattr = 0;
raw_inode->i_pad = 0;
memset((void *)raw_inode + sizeof(*raw_inode), 0,
nilfs->ns_inode_size - sizeof(*raw_inode));
}
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, int flags)
{
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);
if (flags & I_DIRTY_DATASYNC)
set_bit(NILFS_I_INODE_SYNC, &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)
{
__u64 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(__u64, 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_warn(ii->vfs_inode.i_sb, "error %d truncating bmap (ino=%lu)",
ret, ii->vfs_inode.i_ino);
}
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(inode);
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);
/*
* Free resources allocated in nilfs_read_inode(), here.
*/
BUG_ON(!list_empty(&ii->i_dirty));
brelse(ii->i_bh);
ii->i_bh = NULL;
if (nilfs_is_metadata_file_inode(inode))
nilfs_mdt_clear(inode);
if (test_bit(NILFS_I_BMAP, &ii->i_state))
nilfs_bmap_clear(ii->i_bmap);
if (!test_bit(NILFS_I_BTNC, &ii->i_state))
nilfs_detach_btree_node_cache(inode);
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))) {
truncate_inode_pages_final(&inode->i_data);
clear_inode(inode);
nilfs_clear_inode(inode);
return;
}
nilfs_transaction_begin(sb, &ti, 0); /* never fails */
truncate_inode_pages_final(&inode->i_data);
/* TODO: some of the following operations may fail. */
nilfs_truncate_bmap(ii, 0);
nilfs_mark_inode_dirty(inode);
clear_inode(inode);
ret = nilfs_ifile_delete_inode(ii->i_root->ifile, inode->i_ino);
if (!ret)
atomic64_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 mnt_idmap *idmap, struct dentry *dentry,
struct iattr *iattr)
{
struct nilfs_transaction_info ti;
struct inode *inode = d_inode(dentry);
struct super_block *sb = inode->i_sb;
int err;
err = setattr_prepare(&nop_mnt_idmap, dentry, 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)) {
inode_dio_wait(inode);
truncate_setsize(inode, iattr->ia_size);
nilfs_truncate(inode);
}
setattr_copy(&nop_mnt_idmap, 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 mnt_idmap *idmap, struct inode *inode,
int mask)
{
struct nilfs_root *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(&nop_mnt_idmap, inode, mask);
}
int nilfs_load_inode_block(struct inode *inode, struct buffer_head **pbh)
{
struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
struct nilfs_inode_info *ii = NILFS_I(inode);
int err;
spin_lock(&nilfs->ns_inode_lock);
if (ii->i_bh == NULL) {
spin_unlock(&nilfs->ns_inode_lock);
err = nilfs_ifile_get_inode_block(ii->i_root->ifile,
inode->i_ino, pbh);
if (unlikely(err))
return err;
spin_lock(&nilfs->ns_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(&nilfs->ns_inode_lock);
return 0;
}
int nilfs_inode_dirty(struct inode *inode)
{
struct nilfs_inode_info *ii = NILFS_I(inode);
struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
int ret = 0;
if (!list_empty(&ii->i_dirty)) {
spin_lock(&nilfs->ns_inode_lock);
ret = test_bit(NILFS_I_DIRTY, &ii->i_state) ||
test_bit(NILFS_I_BUSY, &ii->i_state);
spin_unlock(&nilfs->ns_inode_lock);
}
return ret;
}
int nilfs_set_file_dirty(struct inode *inode, unsigned int nr_dirty)
{
struct nilfs_inode_info *ii = NILFS_I(inode);
struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
atomic_add(nr_dirty, &nilfs->ns_ndirtyblks);
if (test_and_set_bit(NILFS_I_DIRTY, &ii->i_state))
return 0;
spin_lock(&nilfs->ns_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_warn(inode->i_sb,
"cannot set file dirty (ino=%lu): the file is being freed",
inode->i_ino);
spin_unlock(&nilfs->ns_inode_lock);
return -EINVAL; /*
* NILFS_I_DIRTY may remain for
* freeing inode.
*/
}
list_move_tail(&ii->i_dirty, &nilfs->ns_dirty_files);
set_bit(NILFS_I_QUEUED, &ii->i_state);
}
spin_unlock(&nilfs->ns_inode_lock);
return 0;
}
int __nilfs_mark_inode_dirty(struct inode *inode, int flags)
{
struct buffer_head *ibh;
int err;
err = nilfs_load_inode_block(inode, &ibh);
if (unlikely(err)) {
nilfs_warn(inode->i_sb,
"cannot mark inode dirty (ino=%lu): error %d loading inode block",
inode->i_ino, err);
return err;
}
nilfs_update_inode(inode, ibh, flags);
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.
* @flags: flags to determine the dirty state of the inode
*
* 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, int flags)
{
struct nilfs_transaction_info ti;
struct nilfs_mdt_info *mdi = NILFS_MDT(inode);
if (is_bad_inode(inode)) {
nilfs_warn(inode->i_sb,
"tried to mark bad_inode dirty. ignored.");
dump_stack();
return;
}
if (mdi) {
nilfs_mdt_mark_dirty(inode);
return;
}
nilfs_transaction_begin(inode->i_sb, &ti, 0);
__nilfs_mark_inode_dirty(inode, flags);
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 = inode->i_sb->s_fs_info;
__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_prep(inode, fieinfo, start, &len, 0);
if (ret)
return ret;
inode_lock(inode);
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;
inode_unlock(inode);
return ret;
}