forked from Minki/linux
fat: ignore ctime updates, and keep ctime identical to mtime in memory
FAT supports creation time but not change time, and there was no corresponding timestamp for creation time in previous VFS. The original implementation took the compromise of saving the in-memory change time into the on-disk creation time field, but this would lead to compatibility issues with non-linux systems. To address this issue, this patch changes the behavior of ctime. It will no longer be loaded and stored from the creation time on disk. Instead of that, it'll be consistent with the in-memory mtime and share the same on-disk field. All updates to mtime will also be applied to ctime in memory, while all updates to ctime will be ignored. Link: https://lkml.kernel.org/r/20220503152536.2503003-2-cccheng@synology.com Signed-off-by: Chung-Chiang Cheng <cccheng@synology.com> Acked-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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4dcc3f96e7
commit
0f9d148167
@ -567,12 +567,11 @@ int fat_fill_inode(struct inode *inode, struct msdos_dir_entry *de)
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& ~((loff_t)sbi->cluster_size - 1)) >> 9;
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fat_time_fat2unix(sbi, &inode->i_mtime, de->time, de->date, 0);
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if (sbi->options.isvfat) {
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fat_time_fat2unix(sbi, &inode->i_ctime, de->ctime,
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de->cdate, de->ctime_cs);
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inode->i_ctime = inode->i_mtime;
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if (sbi->options.isvfat)
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fat_time_fat2unix(sbi, &inode->i_atime, 0, de->adate, 0);
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} else
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fat_truncate_time(inode, &inode->i_mtime, S_ATIME|S_CTIME);
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else
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inode->i_atime = fat_truncate_atime(sbi, &inode->i_mtime);
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return 0;
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}
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@ -888,8 +887,6 @@ retry:
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&raw_entry->date, NULL);
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if (sbi->options.isvfat) {
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__le16 atime;
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fat_time_unix2fat(sbi, &inode->i_ctime, &raw_entry->ctime,
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&raw_entry->cdate, &raw_entry->ctime_cs);
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fat_time_unix2fat(sbi, &inode->i_atime, &atime,
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&raw_entry->adate, NULL);
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}
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@ -347,10 +347,13 @@ int fat_truncate_time(struct inode *inode, struct timespec64 *now, int flags)
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if (flags & S_ATIME)
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inode->i_atime = fat_truncate_atime(sbi, now);
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if (flags & S_CTIME)
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inode->i_ctime = fat_truncate_crtime(sbi, now);
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/*
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* ctime and mtime share the same on-disk field, and should be
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* identical in memory. all mtime updates will be applied to ctime,
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* but ctime updates are ignored.
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*/
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if (flags & S_MTIME)
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inode->i_mtime = fat_truncate_mtime(sbi, now);
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inode->i_mtime = inode->i_ctime = fat_truncate_mtime(sbi, now);
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return 0;
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}
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