mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-27 11:19:37 +00:00
![Linus Torvalds](/assets/img/avatar_default.png)
-----BEGIN PGP SIGNATURE----- iHUEABYKAB0WIQRAhzRXHqcMeLMyaSiRxhvAZXjcogUCZOXTKAAKCRCRxhvAZXjc oifJAQCzi/p+AdQu8LA/0XvR7fTwaq64ZDCibU4BISuLGT2kEgEAuGbuoFZa0rs2 XYD/s4+gi64p9Z01MmXm2XO1pu3GPg0= =eJz5 -----END PGP SIGNATURE----- Merge tag 'v6.6-vfs.ctime' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs Pull vfs timestamp updates from Christian Brauner: "This adds VFS support for multi-grain timestamps and converts tmpfs, xfs, ext4, and btrfs to use them. This carries acks from all relevant filesystems. The VFS always uses coarse-grained timestamps when updating the ctime and mtime after a change. This has the benefit of allowing filesystems to optimize away a lot of metadata updates, down to around 1 per jiffy, even when a file is under heavy writes. Unfortunately, this has always been an issue when we're exporting via NFSv3, which relies on timestamps to validate caches. A lot of changes can happen in a jiffy, so timestamps aren't sufficient to help the client decide to invalidate the cache. Even with NFSv4, a lot of exported filesystems don't properly support a change attribute and are subject to the same problems with timestamp granularity. Other applications have similar issues with timestamps (e.g., backup applications). If we were to always use fine-grained timestamps, that would improve the situation, but that becomes rather expensive, as the underlying filesystem would have to log a lot more metadata updates. This introduces fine-grained timestamps that are used when they are actively queried. This uses the 31st bit of the ctime tv_nsec field to indicate that something has queried the inode for the mtime or ctime. When this flag is set, on the next mtime or ctime update, the kernel will fetch a fine-grained timestamp instead of the usual coarse-grained one. As POSIX generally mandates that when the mtime changes, the ctime must also change the kernel always stores normalized ctime values, so only the first 30 bits of the tv_nsec field are ever used. Filesytems can opt into this behavior by setting the FS_MGTIME flag in the fstype. Filesystems that don't set this flag will continue to use coarse-grained timestamps. Various preparatory changes, fixes and cleanups are included: - Fixup all relevant places where POSIX requires updating ctime together with mtime. This is a wide-range of places and all maintainers provided necessary Acks. - Add new accessors for inode->i_ctime directly and change all callers to rely on them. Plain accesses to inode->i_ctime are now gone and it is accordingly rename to inode->__i_ctime and commented as requiring accessors. - Extend generic_fillattr() to pass in a request mask mirroring in a sense the statx() uapi. This allows callers to pass in a request mask to only get a subset of attributes filled in. - Rework timestamp updates so it's possible to drop the @now parameter the update_time() inode operation and associated helpers. - Add inode_update_timestamps() and convert all filesystems to it removing a bunch of open-coding" * tag 'v6.6-vfs.ctime' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs: (107 commits) btrfs: convert to multigrain timestamps ext4: switch to multigrain timestamps xfs: switch to multigrain timestamps tmpfs: add support for multigrain timestamps fs: add infrastructure for multigrain timestamps fs: drop the timespec64 argument from update_time xfs: have xfs_vn_update_time gets its own timestamp fat: make fat_update_time get its own timestamp fat: remove i_version handling from fat_update_time ubifs: have ubifs_update_time use inode_update_timestamps btrfs: have it use inode_update_timestamps fs: drop the timespec64 arg from generic_update_time fs: pass the request_mask to generic_fillattr fs: remove silly warning from current_time gfs2: fix timestamp handling on quota inodes fs: rename i_ctime field to __i_ctime selinux: convert to ctime accessor functions security: convert to ctime accessor functions apparmor: convert to ctime accessor functions sunrpc: convert to ctime accessor functions ...
395 lines
10 KiB
C
395 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Copyright (C) 2017-2018 HUAWEI, Inc.
|
|
* https://www.huawei.com/
|
|
* Copyright (C) 2021, Alibaba Cloud
|
|
*/
|
|
#include "xattr.h"
|
|
|
|
#include <trace/events/erofs.h>
|
|
|
|
static void *erofs_read_inode(struct erofs_buf *buf,
|
|
struct inode *inode, unsigned int *ofs)
|
|
{
|
|
struct super_block *sb = inode->i_sb;
|
|
struct erofs_sb_info *sbi = EROFS_SB(sb);
|
|
struct erofs_inode *vi = EROFS_I(inode);
|
|
const erofs_off_t inode_loc = erofs_iloc(inode);
|
|
|
|
erofs_blk_t blkaddr, nblks = 0;
|
|
void *kaddr;
|
|
struct erofs_inode_compact *dic;
|
|
struct erofs_inode_extended *die, *copied = NULL;
|
|
unsigned int ifmt;
|
|
int err;
|
|
|
|
blkaddr = erofs_blknr(sb, inode_loc);
|
|
*ofs = erofs_blkoff(sb, inode_loc);
|
|
|
|
kaddr = erofs_read_metabuf(buf, sb, blkaddr, EROFS_KMAP);
|
|
if (IS_ERR(kaddr)) {
|
|
erofs_err(sb, "failed to get inode (nid: %llu) page, err %ld",
|
|
vi->nid, PTR_ERR(kaddr));
|
|
return kaddr;
|
|
}
|
|
|
|
dic = kaddr + *ofs;
|
|
ifmt = le16_to_cpu(dic->i_format);
|
|
|
|
if (ifmt & ~EROFS_I_ALL) {
|
|
erofs_err(inode->i_sb, "unsupported i_format %u of nid %llu",
|
|
ifmt, vi->nid);
|
|
err = -EOPNOTSUPP;
|
|
goto err_out;
|
|
}
|
|
|
|
vi->datalayout = erofs_inode_datalayout(ifmt);
|
|
if (vi->datalayout >= EROFS_INODE_DATALAYOUT_MAX) {
|
|
erofs_err(inode->i_sb, "unsupported datalayout %u of nid %llu",
|
|
vi->datalayout, vi->nid);
|
|
err = -EOPNOTSUPP;
|
|
goto err_out;
|
|
}
|
|
|
|
switch (erofs_inode_version(ifmt)) {
|
|
case EROFS_INODE_LAYOUT_EXTENDED:
|
|
vi->inode_isize = sizeof(struct erofs_inode_extended);
|
|
/* check if the extended inode acrosses block boundary */
|
|
if (*ofs + vi->inode_isize <= sb->s_blocksize) {
|
|
*ofs += vi->inode_isize;
|
|
die = (struct erofs_inode_extended *)dic;
|
|
} else {
|
|
const unsigned int gotten = sb->s_blocksize - *ofs;
|
|
|
|
copied = kmalloc(vi->inode_isize, GFP_NOFS);
|
|
if (!copied) {
|
|
err = -ENOMEM;
|
|
goto err_out;
|
|
}
|
|
memcpy(copied, dic, gotten);
|
|
kaddr = erofs_read_metabuf(buf, sb, blkaddr + 1,
|
|
EROFS_KMAP);
|
|
if (IS_ERR(kaddr)) {
|
|
erofs_err(sb, "failed to get inode payload block (nid: %llu), err %ld",
|
|
vi->nid, PTR_ERR(kaddr));
|
|
kfree(copied);
|
|
return kaddr;
|
|
}
|
|
*ofs = vi->inode_isize - gotten;
|
|
memcpy((u8 *)copied + gotten, kaddr, *ofs);
|
|
die = copied;
|
|
}
|
|
vi->xattr_isize = erofs_xattr_ibody_size(die->i_xattr_icount);
|
|
|
|
inode->i_mode = le16_to_cpu(die->i_mode);
|
|
switch (inode->i_mode & S_IFMT) {
|
|
case S_IFREG:
|
|
case S_IFDIR:
|
|
case S_IFLNK:
|
|
vi->raw_blkaddr = le32_to_cpu(die->i_u.raw_blkaddr);
|
|
break;
|
|
case S_IFCHR:
|
|
case S_IFBLK:
|
|
inode->i_rdev =
|
|
new_decode_dev(le32_to_cpu(die->i_u.rdev));
|
|
break;
|
|
case S_IFIFO:
|
|
case S_IFSOCK:
|
|
inode->i_rdev = 0;
|
|
break;
|
|
default:
|
|
goto bogusimode;
|
|
}
|
|
i_uid_write(inode, le32_to_cpu(die->i_uid));
|
|
i_gid_write(inode, le32_to_cpu(die->i_gid));
|
|
set_nlink(inode, le32_to_cpu(die->i_nlink));
|
|
|
|
/* extended inode has its own timestamp */
|
|
inode_set_ctime(inode, le64_to_cpu(die->i_mtime),
|
|
le32_to_cpu(die->i_mtime_nsec));
|
|
|
|
inode->i_size = le64_to_cpu(die->i_size);
|
|
|
|
/* total blocks for compressed files */
|
|
if (erofs_inode_is_data_compressed(vi->datalayout))
|
|
nblks = le32_to_cpu(die->i_u.compressed_blocks);
|
|
else if (vi->datalayout == EROFS_INODE_CHUNK_BASED)
|
|
/* fill chunked inode summary info */
|
|
vi->chunkformat = le16_to_cpu(die->i_u.c.format);
|
|
kfree(copied);
|
|
copied = NULL;
|
|
break;
|
|
case EROFS_INODE_LAYOUT_COMPACT:
|
|
vi->inode_isize = sizeof(struct erofs_inode_compact);
|
|
*ofs += vi->inode_isize;
|
|
vi->xattr_isize = erofs_xattr_ibody_size(dic->i_xattr_icount);
|
|
|
|
inode->i_mode = le16_to_cpu(dic->i_mode);
|
|
switch (inode->i_mode & S_IFMT) {
|
|
case S_IFREG:
|
|
case S_IFDIR:
|
|
case S_IFLNK:
|
|
vi->raw_blkaddr = le32_to_cpu(dic->i_u.raw_blkaddr);
|
|
break;
|
|
case S_IFCHR:
|
|
case S_IFBLK:
|
|
inode->i_rdev =
|
|
new_decode_dev(le32_to_cpu(dic->i_u.rdev));
|
|
break;
|
|
case S_IFIFO:
|
|
case S_IFSOCK:
|
|
inode->i_rdev = 0;
|
|
break;
|
|
default:
|
|
goto bogusimode;
|
|
}
|
|
i_uid_write(inode, le16_to_cpu(dic->i_uid));
|
|
i_gid_write(inode, le16_to_cpu(dic->i_gid));
|
|
set_nlink(inode, le16_to_cpu(dic->i_nlink));
|
|
|
|
/* use build time for compact inodes */
|
|
inode_set_ctime(inode, sbi->build_time, sbi->build_time_nsec);
|
|
|
|
inode->i_size = le32_to_cpu(dic->i_size);
|
|
if (erofs_inode_is_data_compressed(vi->datalayout))
|
|
nblks = le32_to_cpu(dic->i_u.compressed_blocks);
|
|
else if (vi->datalayout == EROFS_INODE_CHUNK_BASED)
|
|
vi->chunkformat = le16_to_cpu(dic->i_u.c.format);
|
|
break;
|
|
default:
|
|
erofs_err(inode->i_sb,
|
|
"unsupported on-disk inode version %u of nid %llu",
|
|
erofs_inode_version(ifmt), vi->nid);
|
|
err = -EOPNOTSUPP;
|
|
goto err_out;
|
|
}
|
|
|
|
if (vi->datalayout == EROFS_INODE_CHUNK_BASED) {
|
|
if (vi->chunkformat & ~EROFS_CHUNK_FORMAT_ALL) {
|
|
erofs_err(inode->i_sb,
|
|
"unsupported chunk format %x of nid %llu",
|
|
vi->chunkformat, vi->nid);
|
|
err = -EOPNOTSUPP;
|
|
goto err_out;
|
|
}
|
|
vi->chunkbits = sb->s_blocksize_bits +
|
|
(vi->chunkformat & EROFS_CHUNK_FORMAT_BLKBITS_MASK);
|
|
}
|
|
inode->i_mtime = inode->i_atime = inode_get_ctime(inode);
|
|
|
|
inode->i_flags &= ~S_DAX;
|
|
if (test_opt(&sbi->opt, DAX_ALWAYS) && S_ISREG(inode->i_mode) &&
|
|
(vi->datalayout == EROFS_INODE_FLAT_PLAIN ||
|
|
vi->datalayout == EROFS_INODE_CHUNK_BASED))
|
|
inode->i_flags |= S_DAX;
|
|
|
|
if (!nblks)
|
|
/* measure inode.i_blocks as generic filesystems */
|
|
inode->i_blocks = round_up(inode->i_size, sb->s_blocksize) >> 9;
|
|
else
|
|
inode->i_blocks = nblks << (sb->s_blocksize_bits - 9);
|
|
return kaddr;
|
|
|
|
bogusimode:
|
|
erofs_err(inode->i_sb, "bogus i_mode (%o) @ nid %llu",
|
|
inode->i_mode, vi->nid);
|
|
err = -EFSCORRUPTED;
|
|
err_out:
|
|
DBG_BUGON(1);
|
|
kfree(copied);
|
|
erofs_put_metabuf(buf);
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
static int erofs_fill_symlink(struct inode *inode, void *kaddr,
|
|
unsigned int m_pofs)
|
|
{
|
|
struct erofs_inode *vi = EROFS_I(inode);
|
|
unsigned int bsz = i_blocksize(inode);
|
|
char *lnk;
|
|
|
|
/* if it cannot be handled with fast symlink scheme */
|
|
if (vi->datalayout != EROFS_INODE_FLAT_INLINE ||
|
|
inode->i_size >= bsz || inode->i_size < 0) {
|
|
inode->i_op = &erofs_symlink_iops;
|
|
return 0;
|
|
}
|
|
|
|
lnk = kmalloc(inode->i_size + 1, GFP_KERNEL);
|
|
if (!lnk)
|
|
return -ENOMEM;
|
|
|
|
m_pofs += vi->xattr_isize;
|
|
/* inline symlink data shouldn't cross block boundary */
|
|
if (m_pofs + inode->i_size > bsz) {
|
|
kfree(lnk);
|
|
erofs_err(inode->i_sb,
|
|
"inline data cross block boundary @ nid %llu",
|
|
vi->nid);
|
|
DBG_BUGON(1);
|
|
return -EFSCORRUPTED;
|
|
}
|
|
memcpy(lnk, kaddr + m_pofs, inode->i_size);
|
|
lnk[inode->i_size] = '\0';
|
|
|
|
inode->i_link = lnk;
|
|
inode->i_op = &erofs_fast_symlink_iops;
|
|
return 0;
|
|
}
|
|
|
|
static int erofs_fill_inode(struct inode *inode)
|
|
{
|
|
struct erofs_inode *vi = EROFS_I(inode);
|
|
struct erofs_buf buf = __EROFS_BUF_INITIALIZER;
|
|
void *kaddr;
|
|
unsigned int ofs;
|
|
int err = 0;
|
|
|
|
trace_erofs_fill_inode(inode);
|
|
|
|
/* read inode base data from disk */
|
|
kaddr = erofs_read_inode(&buf, inode, &ofs);
|
|
if (IS_ERR(kaddr))
|
|
return PTR_ERR(kaddr);
|
|
|
|
/* setup the new inode */
|
|
switch (inode->i_mode & S_IFMT) {
|
|
case S_IFREG:
|
|
inode->i_op = &erofs_generic_iops;
|
|
if (erofs_inode_is_data_compressed(vi->datalayout))
|
|
inode->i_fop = &generic_ro_fops;
|
|
else
|
|
inode->i_fop = &erofs_file_fops;
|
|
break;
|
|
case S_IFDIR:
|
|
inode->i_op = &erofs_dir_iops;
|
|
inode->i_fop = &erofs_dir_fops;
|
|
inode_nohighmem(inode);
|
|
break;
|
|
case S_IFLNK:
|
|
err = erofs_fill_symlink(inode, kaddr, ofs);
|
|
if (err)
|
|
goto out_unlock;
|
|
inode_nohighmem(inode);
|
|
break;
|
|
case S_IFCHR:
|
|
case S_IFBLK:
|
|
case S_IFIFO:
|
|
case S_IFSOCK:
|
|
inode->i_op = &erofs_generic_iops;
|
|
init_special_inode(inode, inode->i_mode, inode->i_rdev);
|
|
goto out_unlock;
|
|
default:
|
|
err = -EFSCORRUPTED;
|
|
goto out_unlock;
|
|
}
|
|
|
|
if (erofs_inode_is_data_compressed(vi->datalayout)) {
|
|
#ifdef CONFIG_EROFS_FS_ZIP
|
|
if (!erofs_is_fscache_mode(inode->i_sb) &&
|
|
inode->i_sb->s_blocksize_bits == PAGE_SHIFT) {
|
|
inode->i_mapping->a_ops = &z_erofs_aops;
|
|
err = 0;
|
|
goto out_unlock;
|
|
}
|
|
#endif
|
|
err = -EOPNOTSUPP;
|
|
goto out_unlock;
|
|
}
|
|
inode->i_mapping->a_ops = &erofs_raw_access_aops;
|
|
mapping_set_large_folios(inode->i_mapping);
|
|
#ifdef CONFIG_EROFS_FS_ONDEMAND
|
|
if (erofs_is_fscache_mode(inode->i_sb))
|
|
inode->i_mapping->a_ops = &erofs_fscache_access_aops;
|
|
#endif
|
|
|
|
out_unlock:
|
|
erofs_put_metabuf(&buf);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* ino_t is 32-bits on 32-bit arch. We have to squash the 64-bit value down
|
|
* so that it will fit.
|
|
*/
|
|
static ino_t erofs_squash_ino(erofs_nid_t nid)
|
|
{
|
|
ino_t ino = (ino_t)nid;
|
|
|
|
if (sizeof(ino_t) < sizeof(erofs_nid_t))
|
|
ino ^= nid >> (sizeof(erofs_nid_t) - sizeof(ino_t)) * 8;
|
|
return ino;
|
|
}
|
|
|
|
static int erofs_iget5_eq(struct inode *inode, void *opaque)
|
|
{
|
|
return EROFS_I(inode)->nid == *(erofs_nid_t *)opaque;
|
|
}
|
|
|
|
static int erofs_iget5_set(struct inode *inode, void *opaque)
|
|
{
|
|
const erofs_nid_t nid = *(erofs_nid_t *)opaque;
|
|
|
|
inode->i_ino = erofs_squash_ino(nid);
|
|
EROFS_I(inode)->nid = nid;
|
|
return 0;
|
|
}
|
|
|
|
struct inode *erofs_iget(struct super_block *sb, erofs_nid_t nid)
|
|
{
|
|
struct inode *inode;
|
|
|
|
inode = iget5_locked(sb, erofs_squash_ino(nid), erofs_iget5_eq,
|
|
erofs_iget5_set, &nid);
|
|
if (!inode)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
if (inode->i_state & I_NEW) {
|
|
int err = erofs_fill_inode(inode);
|
|
|
|
if (err) {
|
|
iget_failed(inode);
|
|
return ERR_PTR(err);
|
|
}
|
|
unlock_new_inode(inode);
|
|
}
|
|
return inode;
|
|
}
|
|
|
|
int erofs_getattr(struct mnt_idmap *idmap, const struct path *path,
|
|
struct kstat *stat, u32 request_mask,
|
|
unsigned int query_flags)
|
|
{
|
|
struct inode *const inode = d_inode(path->dentry);
|
|
|
|
if (erofs_inode_is_data_compressed(EROFS_I(inode)->datalayout))
|
|
stat->attributes |= STATX_ATTR_COMPRESSED;
|
|
|
|
stat->attributes |= STATX_ATTR_IMMUTABLE;
|
|
stat->attributes_mask |= (STATX_ATTR_COMPRESSED |
|
|
STATX_ATTR_IMMUTABLE);
|
|
|
|
generic_fillattr(idmap, request_mask, inode, stat);
|
|
return 0;
|
|
}
|
|
|
|
const struct inode_operations erofs_generic_iops = {
|
|
.getattr = erofs_getattr,
|
|
.listxattr = erofs_listxattr,
|
|
.get_inode_acl = erofs_get_acl,
|
|
.fiemap = erofs_fiemap,
|
|
};
|
|
|
|
const struct inode_operations erofs_symlink_iops = {
|
|
.get_link = page_get_link,
|
|
.getattr = erofs_getattr,
|
|
.listxattr = erofs_listxattr,
|
|
.get_inode_acl = erofs_get_acl,
|
|
};
|
|
|
|
const struct inode_operations erofs_fast_symlink_iops = {
|
|
.get_link = simple_get_link,
|
|
.getattr = erofs_getattr,
|
|
.listxattr = erofs_listxattr,
|
|
.get_inode_acl = erofs_get_acl,
|
|
};
|