From 04f0b2eaa3b3ee243df6040617b4bfbbc0404854 Mon Sep 17 00:00:00 2001 From: Qiuyang Sun Date: Wed, 5 Jun 2019 11:33:25 +0800 Subject: f2fs: ioctl for removing a range from F2FS This ioctl shrinks a given length (aligned to sections) from end of the main area. Any cursegs and valid blocks will be moved out before invalidating the range. This feature can be used for adjusting partition sizes online. History of the patch: Sahitya Tummala: - Add this ioctl for f2fs_compat_ioctl() as well. - Fix debugfs status to reflect the online resize changes. - Fix potential race between online resize path and allocate new data block path or gc path. Others: - Rename some identifiers. - Add some error handling branches. - Clear sbi->next_victim_seg[BG_GC/FG_GC] in shrinking range. - Implement this interface as ext4's, and change the parameter from shrunk bytes to new block count of F2FS. - During resizing, force to empty sit_journal and forbid adding new entries to it, in order to avoid invalid segno in journal after resize. - Reduce sbi->user_block_count before resize starts. - Commit the updated superblock first, and then update in-memory metadata only when the former succeeds. - Target block count must align to sections. - Write checkpoint before and after committing the new superblock, w/o CP_FSCK_FLAG respectively, so that the FS can be fixed by fsck even if resize fails after the new superblock is committed. - In free_segment_range(), reduce granularity of gc_mutex. - Add protection on curseg migration. - Add freeze_bdev() and thaw_bdev() for resize fs. - Remove CUR_MAIN_SECS and use MAIN_SECS directly for allocation. - Recover super_block and FS metadata when resize fails. - No need to clear CP_FSCK_FLAG in update_ckpt_flags(). - Clean up the sb and fs metadata update functions for resize_fs. Geert Uytterhoeven: - Use div_u64*() for 64-bit divisions Arnd Bergmann: - Not all architectures support get_user() with a 64-bit argument: ERROR: "__get_user_bad" [fs/f2fs/f2fs.ko] undefined! Use copy_from_user() here, this will always work. Signed-off-by: Qiuyang Sun Signed-off-by: Chao Yu Signed-off-by: Sahitya Tummala Signed-off-by: Geert Uytterhoeven Signed-off-by: Arnd Bergmann Reviewed-by: Chao Yu Signed-off-by: Jaegeuk Kim --- fs/f2fs/f2fs.h | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'fs/f2fs/f2fs.h') diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h index 9777e306390c..5c983268a303 100644 --- a/fs/f2fs/f2fs.h +++ b/fs/f2fs/f2fs.h @@ -415,6 +415,7 @@ static inline bool __has_cursum_space(struct f2fs_journal *journal, #define F2FS_IOC_SET_PIN_FILE _IOW(F2FS_IOCTL_MAGIC, 13, __u32) #define F2FS_IOC_GET_PIN_FILE _IOR(F2FS_IOCTL_MAGIC, 14, __u32) #define F2FS_IOC_PRECACHE_EXTENTS _IO(F2FS_IOCTL_MAGIC, 15) +#define F2FS_IOC_RESIZE_FS _IOW(F2FS_IOCTL_MAGIC, 16, __u64) #define F2FS_IOC_SET_ENCRYPTION_POLICY FS_IOC_SET_ENCRYPTION_POLICY #define F2FS_IOC_GET_ENCRYPTION_POLICY FS_IOC_GET_ENCRYPTION_POLICY @@ -1116,6 +1117,7 @@ enum { SBI_QUOTA_NEED_FLUSH, /* need to flush quota info in CP */ SBI_QUOTA_SKIP_FLUSH, /* skip flushing quota in current CP */ SBI_QUOTA_NEED_REPAIR, /* quota file may be corrupted */ + SBI_IS_RESIZEFS, /* resizefs is in process */ }; enum { @@ -1236,6 +1238,7 @@ struct f2fs_sb_info { unsigned int segs_per_sec; /* segments per section */ unsigned int secs_per_zone; /* sections per zone */ unsigned int total_sections; /* total section count */ + struct mutex resize_mutex; /* for resize exclusion */ unsigned int total_node_count; /* total node block count */ unsigned int total_valid_node_count; /* valid node block count */ loff_t max_file_blocks; /* max block index of file */ @@ -3058,6 +3061,8 @@ block_t f2fs_get_unusable_blocks(struct f2fs_sb_info *sbi); int f2fs_disable_cp_again(struct f2fs_sb_info *sbi, block_t unusable); void f2fs_release_discard_addrs(struct f2fs_sb_info *sbi); int f2fs_npages_for_summary_flush(struct f2fs_sb_info *sbi, bool for_ra); +void allocate_segment_for_resize(struct f2fs_sb_info *sbi, int type, + unsigned int start, unsigned int end); void f2fs_allocate_new_segments(struct f2fs_sb_info *sbi); int f2fs_trim_fs(struct f2fs_sb_info *sbi, struct fstrim_range *range); bool f2fs_exist_trim_candidates(struct f2fs_sb_info *sbi, @@ -3196,6 +3201,7 @@ block_t f2fs_start_bidx_of_node(unsigned int node_ofs, struct inode *inode); int f2fs_gc(struct f2fs_sb_info *sbi, bool sync, bool background, unsigned int segno); void f2fs_build_gc_manager(struct f2fs_sb_info *sbi); +int f2fs_resize_fs(struct f2fs_sb_info *sbi, __u64 block_count); /* * recovery.c -- cgit v1.2.3-58-ga151