From 85416288bf730cffb61ab6ce8a7b97b17c73458f Mon Sep 17 00:00:00 2001 From: Al Viro Date: Thu, 18 Jun 2015 14:36:31 -0400 Subject: [PATCH] ufs_trunc_...indirect(): pass the array of indices instead of offsets rather than bitslicing the offset just formed as sum of shifted indices, pass the array of those indices itself. NULL is used as equivalent of "all zeroes" (== free the entire branch). Signed-off-by: Al Viro --- fs/ufs/inode.c | 50 ++++++++++++++++++++++---------------------------- 1 file changed, 22 insertions(+), 28 deletions(-) diff --git a/fs/ufs/inode.c b/fs/ufs/inode.c index c2544d62adf2..34d8dac4fe8b 100644 --- a/fs/ufs/inode.c +++ b/fs/ufs/inode.c @@ -1069,7 +1069,7 @@ next1: } -static void ufs_trunc_indirect(struct inode *inode, unsigned from, void *p) +static void ufs_trunc_indirect(struct inode *inode, unsigned *offsets, void *p) { struct super_block *sb = inode->i_sb; struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi; @@ -1077,7 +1077,8 @@ static void ufs_trunc_indirect(struct inode *inode, unsigned from, void *p) void *ind; u64 tmp, frag_to_free = 0; unsigned free_count = 0; - bool to_free = !from; + unsigned from = offsets ? *offsets : 0; + bool to_free = !offsets || !from; unsigned i; tmp = ufs_data_ptr_to_cpu(sb, p); @@ -1134,16 +1135,15 @@ static void ufs_trunc_indirect(struct inode *inode, unsigned from, void *p) ubh_brelse (ind_ubh); } -static void ufs_trunc_dindirect(struct inode *inode, u64 offset, void *p) +static void ufs_trunc_dindirect(struct inode *inode, unsigned *offsets, void *p) { struct super_block *sb = inode->i_sb; struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi; struct ufs_buffer_head *dind_bh; u64 tmp; void *dind; - bool free_it = !offset; - unsigned dindirect_block = offset >> uspi->s_apbshift; - unsigned from = offset & uspi->s_apbmask; + bool free_it = !offsets || !(offsets[0] || offsets[1]); + unsigned dindirect_block = offsets ? *offsets++ : 0; unsigned i; tmp = ufs_data_ptr_to_cpu(sb, p); @@ -1157,12 +1157,12 @@ static void ufs_trunc_dindirect(struct inode *inode, u64 offset, void *p) return; } - for (i = dindirect_block ; i < uspi->s_apb ; i++, from = 0) { + for (i = dindirect_block ; i < uspi->s_apb ; i++, offsets = NULL) { dind = ubh_get_data_ptr(uspi, dind_bh, i); tmp = ufs_data_ptr_to_cpu(sb, dind); if (!tmp) continue; - ufs_trunc_indirect(inode, from, dind); + ufs_trunc_indirect(inode, offsets, dind); ubh_mark_buffer_dirty(dind_bh); } @@ -1182,7 +1182,7 @@ static void ufs_trunc_dindirect(struct inode *inode, u64 offset, void *p) ubh_brelse (dind_bh); } -static void ufs_trunc_tindirect(struct inode *inode, u64 offset) +static void ufs_trunc_tindirect(struct inode *inode, unsigned *offsets) { struct super_block *sb = inode->i_sb; struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi; @@ -1190,12 +1190,10 @@ static void ufs_trunc_tindirect(struct inode *inode, u64 offset) struct ufs_buffer_head * tind_bh; u64 tmp; void *tind, *p; - bool free_it = !offset; - unsigned tindirect_block = offset >> uspi->s_2apbshift; + bool free_it = !offsets || !(offsets[0] || offsets[1] || offsets[2]); + unsigned tindirect_block = offsets ? *offsets++ : 0; unsigned i; - offset -= tindirect_block << uspi->s_2apbshift; - p = ufs_get_direct_data_ptr(uspi, ufsi, UFS_TIND_BLOCK); if (!(tmp = ufs_data_ptr_to_cpu(sb, p))) return; @@ -1207,9 +1205,9 @@ static void ufs_trunc_tindirect(struct inode *inode, u64 offset) return; } - for (i = tindirect_block ; i < uspi->s_apb ; i++, offset = 0) { + for (i = tindirect_block ; i < uspi->s_apb ; i++, offsets = NULL) { tind = ubh_get_data_ptr(uspi, tind_bh, i); - ufs_trunc_dindirect(inode, offset, tind); + ufs_trunc_dindirect(inode, offsets, tind); ubh_mark_buffer_dirty(tind_bh); } if (free_it) { @@ -1310,30 +1308,26 @@ static void __ufs_truncate_blocks(struct inode *inode) switch (depth) { case 1: ufs_trunc_direct(inode); - ufs_trunc_indirect(inode, 0, + ufs_trunc_indirect(inode, NULL, ufs_get_direct_data_ptr(uspi, ufsi, UFS_IND_BLOCK)); - ufs_trunc_dindirect(inode, 0, + ufs_trunc_dindirect(inode, NULL, ufs_get_direct_data_ptr(uspi, ufsi, UFS_DIND_BLOCK)); - ufs_trunc_tindirect(inode, 0); + ufs_trunc_tindirect(inode, NULL); break; case 2: - ufs_trunc_indirect(inode, offsets[1], + ufs_trunc_indirect(inode, offsets + 1, ufs_get_direct_data_ptr(uspi, ufsi, UFS_IND_BLOCK)); - ufs_trunc_dindirect(inode, 0, + ufs_trunc_dindirect(inode, NULL, ufs_get_direct_data_ptr(uspi, ufsi, UFS_DIND_BLOCK)); - ufs_trunc_tindirect(inode, 0); + ufs_trunc_tindirect(inode, NULL); break; case 3: - ufs_trunc_dindirect(inode, - (offsets[1] << uspi->s_apbshift) + offsets[2], + ufs_trunc_dindirect(inode, offsets + 1, ufs_get_direct_data_ptr(uspi, ufsi, UFS_DIND_BLOCK)); - ufs_trunc_tindirect(inode, 0); + ufs_trunc_tindirect(inode, NULL); break; case 4: - ufs_trunc_tindirect(inode, - (offsets[1] << uspi->s_2apbshift) + - (offsets[2] << uspi->s_apbshift) + - offsets[3]); + ufs_trunc_tindirect(inode, offsets + 1); } ufsi->i_lastfrag = DIRECT_FRAGMENT; mutex_unlock(&ufsi->truncate_mutex);