From 979618d56da6ae95fe412e8f3d74a5b83f1dc894 Mon Sep 17 00:00:00 2001 From: Namjae Jeon Date: Fri, 3 Jan 2014 14:10:25 +1100 Subject: [PATCH] fat: add i_disksize to represent uninitialized size Add i_disksize to represent uninitialized allocated size. And mmu_private represent initialized allocated size. Signed-off-by: Namjae Jeon Signed-off-by: Amit Sahrawat Cc: OGAWA Hirofumi Signed-off-by: Andrew Morton --- fs/fat/cache.c | 6 +++--- fs/fat/fat.h | 3 ++- fs/fat/file.c | 4 +++- fs/fat/inode.c | 4 ++++ 4 files changed, 12 insertions(+), 5 deletions(-) diff --git a/fs/fat/cache.c b/fs/fat/cache.c index 91ad9e1c9441..a132666920e6 100644 --- a/fs/fat/cache.c +++ b/fs/fat/cache.c @@ -329,10 +329,10 @@ int fat_bmap(struct inode *inode, sector_t sector, sector_t *phys, return 0; /* - * ->mmu_private can access on only allocation path. - * (caller must hold ->i_mutex) + * Both ->mmu_private and ->i_disksize can access + * on only allocation path. (caller must hold ->i_mutex) */ - last_block = (MSDOS_I(inode)->mmu_private + (blocksize - 1)) + last_block = (MSDOS_I(inode)->i_disksize + (blocksize - 1)) >> blocksize_bits; if (sector >= last_block) return 0; diff --git a/fs/fat/fat.h b/fs/fat/fat.h index 7c31f4bc74a9..a3df2ad45a89 100644 --- a/fs/fat/fat.h +++ b/fs/fat/fat.h @@ -118,7 +118,8 @@ struct msdos_inode_info { unsigned int cache_valid_id; /* NOTE: mmu_private is 64bits, so must hold ->i_mutex to access */ - loff_t mmu_private; /* physically allocated size */ + loff_t mmu_private; /* physically allocated size (uninitialized) */ + loff_t i_disksize; /* physically allocated size (initialized) */ int i_start; /* first cluster or 0 */ int i_logstart; /* logical first cluster */ diff --git a/fs/fat/file.c b/fs/fat/file.c index 9b104f543056..0bf0d281ea5c 100644 --- a/fs/fat/file.c +++ b/fs/fat/file.c @@ -300,8 +300,10 @@ void fat_truncate_blocks(struct inode *inode, loff_t offset) * This protects against truncating a file bigger than it was then * trying to write into the hole. */ - if (MSDOS_I(inode)->mmu_private > offset) + if (MSDOS_I(inode)->i_disksize > offset) { MSDOS_I(inode)->mmu_private = offset; + MSDOS_I(inode)->i_disksize = offset; + } nr_clusters = (offset + (cluster_size - 1)) >> sbi->cluster_bits; diff --git a/fs/fat/inode.c b/fs/fat/inode.c index 854b578f6695..7e5531a8fdea 100644 --- a/fs/fat/inode.c +++ b/fs/fat/inode.c @@ -93,6 +93,7 @@ static inline int __fat_get_block(struct inode *inode, sector_t iblock, *max_blocks = min(mapped_blocks, *max_blocks); MSDOS_I(inode)->mmu_private += *max_blocks << sb->s_blocksize_bits; + MSDOS_I(inode)->i_disksize = MSDOS_I(inode)->mmu_private; err = fat_bmap(inode, iblock, &phys, &mapped_blocks, create); if (err) @@ -408,6 +409,7 @@ int fat_fill_inode(struct inode *inode, struct msdos_dir_entry *de) if (error < 0) return error; MSDOS_I(inode)->mmu_private = inode->i_size; + MSDOS_I(inode)->i_disksize = inode->i_size; set_nlink(inode, fat_subdirs(inode)); } else { /* not a directory */ @@ -423,6 +425,7 @@ int fat_fill_inode(struct inode *inode, struct msdos_dir_entry *de) inode->i_fop = &fat_file_operations; inode->i_mapping->a_ops = &fat_aops; MSDOS_I(inode)->mmu_private = inode->i_size; + MSDOS_I(inode)->i_disksize = inode->i_size; } if (de->attr & ATTR_SYS) { if (sbi->options.sys_immutable) @@ -1223,6 +1226,7 @@ static int fat_read_root(struct inode *inode) & ~((loff_t)sbi->cluster_size - 1)) >> 9; MSDOS_I(inode)->i_logstart = 0; MSDOS_I(inode)->mmu_private = inode->i_size; + MSDOS_I(inode)->i_disksize = inode->i_size; fat_save_attrs(inode, ATTR_DIR); inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = 0; -- 2.39.5