| 1 |
diff -up -r linux-2.6.19.org/fs/fat/dir.c linux-2.6.19/fs/fat/dir.c |
| 2 |
--- linux-2.6.19.org/fs/fat/dir.c 2007-09-29 15:27:28.000000000 +0200 |
| 3 |
+++ linux-2.6.19/fs/fat/dir.c 2007-09-29 15:28:16.000000000 +0200 |
| 4 |
@@ -241,6 +241,7 @@ static int fat_parse_long(struct inode * |
| 5 |
{ |
| 6 |
struct msdos_dir_slot *ds; |
| 7 |
unsigned char id, slot, slots, alias_checksum; |
| 8 |
+ int epoc = MSDOS_SB(dir->i_sb)->options.epoc; |
| 9 |
|
| 10 |
if (!*unicode) { |
| 11 |
*unicode = (wchar_t *)__get_free_page(GFP_KERNEL); |
| 12 |
@@ -287,6 +288,8 @@ parse_long: |
| 13 |
} |
| 14 |
if ((*de)->name[0] == DELETED_FLAG) |
| 15 |
return PARSE_INVALID; |
| 16 |
+ if (epoc && ((*de)->name[0] == EOD_FLAG)) |
| 17 |
+ return PARSE_EOF; |
| 18 |
if ((*de)->attr == ATTR_EXT) |
| 19 |
goto parse_long; |
| 20 |
if (IS_FREE((*de)->name) || ((*de)->attr & ATTR_VOLUME)) |
| 21 |
@@ -320,6 +323,7 @@ int fat_search_long(struct inode *inode, |
| 22 |
unsigned short opt_shortname = sbi->options.shortname; |
| 23 |
loff_t cpos = 0; |
| 24 |
int chl, i, j, last_u, err; |
| 25 |
+ int epoc = sbi->options.epoc; |
| 26 |
|
| 27 |
err = -ENOENT; |
| 28 |
while(1) { |
| 29 |
@@ -329,6 +333,9 @@ parse_record: |
| 30 |
nr_slots = 0; |
| 31 |
if (de->name[0] == DELETED_FLAG) |
| 32 |
continue; |
| 33 |
+ if (epoc && (de->name[0] == EOD_FLAG)) |
| 34 |
+ goto EODir; |
| 35 |
+ |
| 36 |
if (de->attr != ATTR_EXT && (de->attr & ATTR_VOLUME)) |
| 37 |
continue; |
| 38 |
if (de->attr != ATTR_EXT && IS_FREE(de->name)) |
| 39 |
@@ -456,6 +463,8 @@ static int __fat_readdir(struct inode *i |
| 40 |
int chi, chl, i, i2, j, last, last_u, dotoffset = 0; |
| 41 |
loff_t cpos; |
| 42 |
int ret = 0; |
| 43 |
+ int epoc = MSDOS_SB(sb)->options.epoc; |
| 44 |
+ |
| 45 |
|
| 46 |
lock_kernel(); |
| 47 |
|
| 48 |
@@ -486,6 +495,8 @@ GetNew: |
| 49 |
parse_record: |
| 50 |
long_slots = 0; |
| 51 |
/* Check for long filename entry */ |
| 52 |
+ if (epoc && (de->name[0] == EOD_FLAG)) |
| 53 |
+ goto EODir; |
| 54 |
if (isvfat) { |
| 55 |
if (de->name[0] == DELETED_FLAG) |
| 56 |
goto RecEnd; |
| 57 |
@@ -808,7 +819,10 @@ static int fat_get_short_entry(struct in |
| 58 |
struct buffer_head **bh, |
| 59 |
struct msdos_dir_entry **de) |
| 60 |
{ |
| 61 |
+ int epoc = MSDOS_SB(dir->i_sb)->options.epoc; |
| 62 |
while (fat_get_entry(dir, pos, bh, de) >= 0) { |
| 63 |
+ if (epoc && ((*de)->name[0] == EOD_FLAG)) |
| 64 |
+ return -ENOENT; |
| 65 |
/* free entry or long name entry or volume label */ |
| 66 |
if (!IS_FREE((*de)->name) && !((*de)->attr & ATTR_VOLUME)) |
| 67 |
return 0; |
| 68 |
@@ -1186,6 +1200,25 @@ error: |
| 69 |
return err; |
| 70 |
} |
| 71 |
|
| 72 |
+int fat_write_zero_entry(struct inode *dir, loff_t curr) |
| 73 |
+{ |
| 74 |
+ struct msdos_dir_entry *de = NULL; |
| 75 |
+ struct buffer_head *bh = NULL; |
| 76 |
+ loff_t pos; |
| 77 |
+ int err = 0; |
| 78 |
+ |
| 79 |
+ pos = curr; |
| 80 |
+ if (fat_get_entry(dir,&pos,&bh,&de) < 0) |
| 81 |
+ return 0; |
| 82 |
+ |
| 83 |
+ de->name[0] = EOD_FLAG; |
| 84 |
+ mark_buffer_dirty(bh); |
| 85 |
+ if (IS_DIRSYNC(dir)) |
| 86 |
+ err = sync_dirty_buffer(bh); |
| 87 |
+ brelse(bh); |
| 88 |
+ return err; |
| 89 |
+} |
| 90 |
+ |
| 91 |
int fat_add_entries(struct inode *dir, void *slots, int nr_slots, |
| 92 |
struct fat_slot_info *sinfo) |
| 93 |
{ |
| 94 |
@@ -1195,6 +1228,8 @@ int fat_add_entries(struct inode *dir, v |
| 95 |
struct msdos_dir_entry *de; |
| 96 |
int err, free_slots, i, nr_bhs; |
| 97 |
loff_t pos, i_pos; |
| 98 |
+ int epoc = sbi->options.epoc; |
| 99 |
+ int last_entry = 0; |
| 100 |
|
| 101 |
sinfo->nr_slots = nr_slots; |
| 102 |
|
| 103 |
@@ -1208,7 +1243,9 @@ int fat_add_entries(struct inode *dir, v |
| 104 |
if (pos >= FAT_MAX_DIR_SIZE) |
| 105 |
goto error; |
| 106 |
|
| 107 |
- if (IS_FREE(de->name)) { |
| 108 |
+ if (epoc && (de->name[0] == EOD_FLAG)) |
| 109 |
+ last_entry = 1; |
| 110 |
+ if (last_entry || IS_FREE(de->name)) { |
| 111 |
if (prev != bh) { |
| 112 |
get_bh(bh); |
| 113 |
bhs[nr_bhs] = prev = bh; |
| 114 |
@@ -1238,6 +1275,17 @@ found: |
| 115 |
err = 0; |
| 116 |
pos -= free_slots * sizeof(*de); |
| 117 |
nr_slots -= free_slots; |
| 118 |
+ |
| 119 |
+ /* We need to write an end-of-directory slot. And we do it first, |
| 120 |
+ * because we want to keep the directory in a readble state. |
| 121 |
+ * Note that there is no need to remove it on error, as it is beyond |
| 122 |
+ * the visible end of directory anyway. |
| 123 |
+ */ |
| 124 |
+ if (epoc && !nr_slots && last_entry) |
| 125 |
+ err = fat_write_zero_entry(dir, pos + free_slots * sizeof(*de)); |
| 126 |
+ if (err) |
| 127 |
+ goto error; |
| 128 |
+ |
| 129 |
if (free_slots) { |
| 130 |
/* |
| 131 |
* Second stage: filling the free entries with new entries. |
| 132 |
diff -up -r linux-2.6.19.org/fs/fat/inode.c linux-2.6.19/fs/fat/inode.c |
| 133 |
--- linux-2.6.19.org/fs/fat/inode.c 2007-09-29 15:27:28.000000000 +0200 |
| 134 |
+++ linux-2.6.19/fs/fat/inode.c 2007-09-29 15:29:36.000000000 +0200 |
| 135 |
@@ -854,6 +854,7 @@ enum { |
| 136 |
Opt_charset, Opt_shortname_lower, Opt_shortname_win95, |
| 137 |
Opt_shortname_winnt, Opt_shortname_mixed, Opt_utf8_no, Opt_utf8_yes, |
| 138 |
Opt_uni_xl_no, Opt_uni_xl_yes, Opt_nonumtail_no, Opt_nonumtail_yes, |
| 139 |
+ Opt_epoc, |
| 140 |
Opt_obsolate, Opt_flush, Opt_err, |
| 141 |
}; |
| 142 |
|
| 143 |
@@ -875,6 +876,7 @@ static match_table_t fat_tokens = { |
| 144 |
{Opt_showexec, "showexec"}, |
| 145 |
{Opt_debug, "debug"}, |
| 146 |
{Opt_immutable, "sys_immutable"}, |
| 147 |
+ {Opt_epoc, "epoc"}, |
| 148 |
{Opt_obsolate, "conv=binary"}, |
| 149 |
{Opt_obsolate, "conv=text"}, |
| 150 |
{Opt_obsolate, "conv=auto"}, |
| 151 |
@@ -1031,6 +1033,10 @@ static int parse_options(char *options, |
| 152 |
case Opt_flush: |
| 153 |
opts->flush = 1; |
| 154 |
break; |
| 155 |
+ case Opt_epoc: |
| 156 |
+ opts->epoc = 1; |
| 157 |
+ break; |
| 158 |
+ |
| 159 |
|
| 160 |
/* msdos specific */ |
| 161 |
case Opt_dots: |
| 162 |
diff -up -r linux-2.6.19.org/include/linux/msdos_fs.h linux-2.6.19/include/linux/msdos_fs.h |
| 163 |
--- linux-2.6.19.org/include/linux/msdos_fs.h 2007-09-29 15:27:43.000000000 +0200 |
| 164 |
+++ linux-2.6.19/include/linux/msdos_fs.h 2007-09-29 15:31:01.000000000 +0200 |
| 165 |
@@ -44,6 +44,7 @@ |
| 166 |
#define CASE_LOWER_EXT 16 /* extension is lower case */ |
| 167 |
|
| 168 |
#define DELETED_FLAG 0xe5 /* marks file as deleted when in name[0] */ |
| 169 |
+#define EOD_FLAG 0x00 /* marks end of directory when in name[0] for old fats */ |
| 170 |
#define IS_FREE(n) (!*(n) || *(n) == DELETED_FLAG) |
| 171 |
|
| 172 |
/* valid file mode bits */ |
| 173 |
@@ -206,6 +207,7 @@ struct fat_mount_options { |
| 174 |
atari:1, /* Use Atari GEMDOS variation of MS-DOS fs */ |
| 175 |
flush:1, /* write things quickly */ |
| 176 |
- nocase:1; /* Does this need case conversion? 0=need case conversion*/ |
| 177 |
+ nocase:1, /* Does this need case conversion? 0=need case conversion*/ |
| 178 |
+ epoc:1; /* Filename starting with 0x00 marks end of dir? */ |
| 179 |
}; |
| 180 |
|
| 181 |
#define FAT_HASH_BITS 8 |
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