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Date: Fri, 29 Jun 2012 13:50:47 -0500
From: "Steven J. Magnani" <steve@...idescorp.com>
To: OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
Cc: linux-kernel@...r.kernel.org,
"Steven J. Magnani" <steve@...idescorp.com>
Subject: [PATCH] fat: Accessors for msdos_dir_entry 'start' fields
Simplify code by providing accessor functions for the directory entry
start cluster fields.
Signed-off-by: Steven J. Magnani <steve@...idescorp.com>
---
diff -uprN linux-3.5-rc4/fs/fat/fat.h new/fs/fat/fat.h
--- linux-3.5-rc4/fs/fat/fat.h 2012-06-29 11:20:12.670349215 -0500
+++ new/fs/fat/fat.h 2012-06-29 13:27:11.336157236 -0500
@@ -217,6 +217,21 @@ static inline void fat16_towchar(wchar_t
#endif
}
+static inline int fat_get_start(const struct msdos_sb_info *sbi,
+ const struct msdos_dir_entry *de)
+{
+ int cluster = le16_to_cpu(de->start);
+ if (sbi->fat_bits == 32)
+ cluster |= (le16_to_cpu(de->starthi) << 16);
+ return cluster;
+}
+
+static inline void fat_set_start(struct msdos_dir_entry *de, int cluster)
+{
+ de->start = cpu_to_le16(cluster);
+ de->starthi = cpu_to_le16(cluster >> 16);
+}
+
static inline void fatwchar_to16(__u8 *dst, const wchar_t *src, size_t len)
{
#ifdef __BIG_ENDIAN
diff -uprN linux-3.5-rc4/fs/fat/inode.c new/fs/fat/inode.c
--- linux-3.5-rc4/fs/fat/inode.c 2012-06-29 11:20:12.781348652 -0500
+++ new/fs/fat/inode.c 2012-06-29 13:31:10.394924190 -0500
@@ -369,10 +369,7 @@ static int fat_fill_inode(struct inode *
inode->i_op = sbi->dir_ops;
inode->i_fop = &fat_dir_operations;
- MSDOS_I(inode)->i_start = le16_to_cpu(de->start);
- if (sbi->fat_bits == 32)
- MSDOS_I(inode)->i_start |= (le16_to_cpu(de->starthi) << 16);
-
+ MSDOS_I(inode)->i_start = fat_get_start(sbi, de);
MSDOS_I(inode)->i_logstart = MSDOS_I(inode)->i_start;
error = fat_calc_dir_size(inode);
if (error < 0)
@@ -385,9 +382,7 @@ static int fat_fill_inode(struct inode *
inode->i_mode = fat_make_mode(sbi, de->attr,
((sbi->options.showexec && !is_exec(de->name + 8))
? S_IRUGO|S_IWUGO : S_IRWXUGO));
- MSDOS_I(inode)->i_start = le16_to_cpu(de->start);
- if (sbi->fat_bits == 32)
- MSDOS_I(inode)->i_start |= (le16_to_cpu(de->starthi) << 16);
+ MSDOS_I(inode)->i_start = fat_get_start(sbi, de);
MSDOS_I(inode)->i_logstart = MSDOS_I(inode)->i_start;
inode->i_size = le32_to_cpu(de->size);
@@ -613,8 +608,7 @@ retry:
else
raw_entry->size = cpu_to_le32(inode->i_size);
raw_entry->attr = fat_make_attrs(inode);
- raw_entry->start = cpu_to_le16(MSDOS_I(inode)->i_logstart);
- raw_entry->starthi = cpu_to_le16(MSDOS_I(inode)->i_logstart >> 16);
+ fat_set_start(raw_entry, MSDOS_I(inode)->i_logstart);
fat_time_unix2fat(sbi, &inode->i_mtime, &raw_entry->time,
&raw_entry->date, NULL);
if (sbi->options.isvfat) {
diff -uprN linux-3.5-rc4/fs/fat/namei_msdos.c new/fs/fat/namei_msdos.c
--- linux-3.5-rc4/fs/fat/namei_msdos.c 2012-06-29 11:20:12.809348509 -0500
+++ new/fs/fat/namei_msdos.c 2012-06-29 13:32:24.201544986 -0500
@@ -246,8 +246,7 @@ static int msdos_add_entry(struct inode
de.ctime_cs = 0;
de.time = time;
de.date = date;
- de.start = cpu_to_le16(cluster);
- de.starthi = cpu_to_le16(cluster >> 16);
+ fat_set_start(&de, cluster);
de.size = 0;
err = fat_add_entries(dir, &de, 1, sinfo);
@@ -530,9 +529,7 @@ static int do_msdos_rename(struct inode
mark_inode_dirty(old_inode);
if (update_dotdot) {
- int start = MSDOS_I(new_dir)->i_logstart;
- dotdot_de->start = cpu_to_le16(start);
- dotdot_de->starthi = cpu_to_le16(start >> 16);
+ fat_set_start(dotdot_de, MSDOS_I(new_dir)->i_logstart);
mark_buffer_dirty_inode(dotdot_bh, old_inode);
if (IS_DIRSYNC(new_dir)) {
err = sync_dirty_buffer(dotdot_bh);
@@ -572,9 +569,7 @@ error_dotdot:
corrupt = 1;
if (update_dotdot) {
- int start = MSDOS_I(old_dir)->i_logstart;
- dotdot_de->start = cpu_to_le16(start);
- dotdot_de->starthi = cpu_to_le16(start >> 16);
+ fat_set_start(dotdot_de, MSDOS_I(old_dir)->i_logstart);
mark_buffer_dirty_inode(dotdot_bh, old_inode);
corrupt |= sync_dirty_buffer(dotdot_bh);
}
diff -uprN linux-3.5-rc4/fs/fat/namei_vfat.c new/fs/fat/namei_vfat.c
--- linux-3.5-rc4/fs/fat/namei_vfat.c 2012-06-29 11:20:12.765348733 -0500
+++ new/fs/fat/namei_vfat.c 2012-06-29 13:33:28.778213709 -0500
@@ -651,8 +651,7 @@ shortname:
de->time = de->ctime = time;
de->date = de->cdate = de->adate = date;
de->ctime_cs = time_cs;
- de->start = cpu_to_le16(cluster);
- de->starthi = cpu_to_le16(cluster >> 16);
+ fat_set_start(de, cluster);
de->size = 0;
out_free:
__putname(uname);
@@ -965,9 +964,7 @@ static int vfat_rename(struct inode *old
mark_inode_dirty(old_inode);
if (update_dotdot) {
- int start = MSDOS_I(new_dir)->i_logstart;
- dotdot_de->start = cpu_to_le16(start);
- dotdot_de->starthi = cpu_to_le16(start >> 16);
+ fat_set_start(dotdot_de, MSDOS_I(new_dir)->i_logstart);
mark_buffer_dirty_inode(dotdot_bh, old_inode);
if (IS_DIRSYNC(new_dir)) {
err = sync_dirty_buffer(dotdot_bh);
@@ -1009,9 +1006,7 @@ error_dotdot:
corrupt = 1;
if (update_dotdot) {
- int start = MSDOS_I(old_dir)->i_logstart;
- dotdot_de->start = cpu_to_le16(start);
- dotdot_de->starthi = cpu_to_le16(start >> 16);
+ fat_set_start(dotdot_de, MSDOS_I(old_dir)->i_logstart);
mark_buffer_dirty_inode(dotdot_bh, old_inode);
corrupt |= sync_dirty_buffer(dotdot_bh);
}
--
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