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Kernel: Update atime/ctime/mtime timestamps atomically

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Instead of having three separate APIs (one for each timestamp),
there's now only Inode::update_timestamps() and it takes 3x optional
timestamps. The non-empty timestamps are updated while holding the inode
mutex, and the outside world no longer has to look at intermediate
timestamp states.
This commit is contained in:
Andreas Kling
2022-08-22 13:34:22 +02:00
parent 35b2e9c663
commit 280694bb46
18 changed files with 34 additions and 109 deletions
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35
Kernel/FileSystem/Ext2FileSystem.cpp
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@@ -1537,34 +1537,23 @@ ErrorOr<NonnullLockRefPtr<Inode>> Ext2FSInode::lookup(StringView name)
return fs().get_inode({ fsid(), inode_index });
}
ErrorOr<void> Ext2FSInode::set_atime(time_t t)
ErrorOr<void> Ext2FSInode::update_timestamps(Optional<time_t> atime, Optional<time_t> ctime, Optional<time_t> mtime)
{
MutexLocker locker(m_inode_lock);
if (fs().is_readonly())
return EROFS;
if (t > INT32_MAX)
if (atime.value_or(0) > INT32_MAX)
return EINVAL;
m_raw_inode.i_atime = t;
set_metadata_dirty(true);
return {};
}
ErrorOr<void> Ext2FSInode::set_ctime(time_t t)
{
MutexLocker locker(m_inode_lock);
if (fs().is_readonly())
return EROFS;
m_raw_inode.i_ctime = t;
set_metadata_dirty(true);
return {};
}
ErrorOr<void> Ext2FSInode::set_mtime(time_t t)
{
MutexLocker locker(m_inode_lock);
if (fs().is_readonly())
return EROFS;
m_raw_inode.i_mtime = t;
if (ctime.value_or(0) > INT32_MAX)
return EINVAL;
if (mtime.value_or(0) > INT32_MAX)
return EINVAL;
if (atime.has_value())
m_raw_inode.i_atime = atime.value();
if (ctime.has_value())
m_raw_inode.i_ctime = ctime.value();
if (mtime.has_value())
m_raw_inode.i_mtime = mtime.value();
set_metadata_dirty(true);
return {};
}