fat-epoc/trunk/fat-epoc-2.6.22.diff

diff -r -u2 -p linux-2.6.22.unpatched/fs/fat/dir.c linux-2.6.22/fs/fat/dir.c
--- linux-2.6.22.unpatched/fs/fat/dir.c 2007-11-06 22:45:27.000000000 +0100
+++ linux-2.6.22/fs/fat/dir.c   2007-11-06 22:59:08.000000000 +0100
@@ -242,4 +242,5 @@ static int fat_parse_long(struct inode *
        struct msdos_dir_slot *ds;
        unsigned char id, slot, slots, alias_checksum;
+       int epoc = MSDOS_SB(dir->i_sb)->options.epoc;
 
        if (!*unicode) {
@@ -288,4 +289,8 @@ parse_long:
        if ((*de)->name[0] == DELETED_FLAG)
                return PARSE_INVALID;
+       if (epoc && ((*de)->name[0] == EOD_FLAG)) {
+               while (fat_get_entry(dir, pos, bh, de) >= 0);
+               return PARSE_EOF;
+       }
        if ((*de)->attr == ATTR_EXT)
                goto parse_long;
@@ -321,4 +326,5 @@ int fat_search_long(struct inode *inode,
        loff_t cpos = 0;
        int chl, i, j, last_u, err;
+       int epoc = sbi->options.epoc;
 
        err = -ENOENT;
@@ -330,4 +336,8 @@ parse_record:
                if (de->name[0] == DELETED_FLAG)
                        continue;
+               if (epoc && (de->name[0] == EOD_FLAG)) {
+                       while (fat_get_entry(inode, &cpos, &bh, &de) >= 0);
+                       goto EODir;
+               }
                if (de->attr != ATTR_EXT && (de->attr & ATTR_VOLUME))
                        continue;
@@ -457,4 +467,6 @@ static int __fat_readdir(struct inode *i
        loff_t cpos;
        int ret = 0;
+       int epoc = MSDOS_SB(sb)->options.epoc;
+
 
        lock_kernel();
@@ -487,4 +499,8 @@ parse_record:
        long_slots = 0;
        /* Check for long filename entry */
+       if (epoc && (de->name[0] == EOD_FLAG)) {
+               while (fat_get_entry(inode, &cpos, &bh, &de) >= 0);
+               goto EODir;
+       }
        if (isvfat) {
                if (de->name[0] == DELETED_FLAG)
@@ -810,5 +826,10 @@ static int fat_get_short_entry(struct in
                               struct msdos_dir_entry **de)
 {
+       int epoc = MSDOS_SB(dir->i_sb)->options.epoc;
        while (fat_get_entry(dir, pos, bh, de) >= 0) {
+               if (epoc && ((*de)->name[0] == EOD_FLAG)) {
+                       while (fat_get_entry(dir, pos, bh, de) >= 0);
+                       return -ENOENT;
+               }
                /* free entry or long name entry or volume label */
                if (!IS_FREE((*de)->name) && !((*de)->attr & ATTR_VOLUME))
@@ -1188,4 +1209,23 @@ error:
 }
 
+int fat_write_zero_entry(struct inode *dir, loff_t curr)
+{
+       struct msdos_dir_entry *de = NULL;
+       struct buffer_head *bh = NULL;
+       loff_t pos;
+       int err = 0;
+
+       pos = curr;
+       if (fat_get_entry(dir,&pos,&bh,&de) < 0)
+               return 0;
+
+       de->name[0] = EOD_FLAG;
+       mark_buffer_dirty(bh);
+       if (IS_DIRSYNC(dir))
+               err = sync_dirty_buffer(bh);
+       brelse(bh);
+       return err;
+}
+
 int fat_add_entries(struct inode *dir, void *slots, int nr_slots,
                    struct fat_slot_info *sinfo)
@@ -1197,4 +1237,6 @@ int fat_add_entries(struct inode *dir, v
        int err, free_slots, i, nr_bhs;
        loff_t pos, i_pos;
+       int epoc = sbi->options.epoc;
+       int last_entry = 0;
 
        sinfo->nr_slots = nr_slots;
@@ -1210,5 +1252,7 @@ int fat_add_entries(struct inode *dir, v
                        goto error;
 
-               if (IS_FREE(de->name)) {
+               if (epoc && (de->name[0] == EOD_FLAG))
+                       last_entry = 1;
+               if (last_entry || IS_FREE(de->name)) {
                        if (prev != bh) {
                                get_bh(bh);
@@ -1240,4 +1284,15 @@ found:
        pos -= free_slots * sizeof(*de);
        nr_slots -= free_slots;
+
+       /* We need to write an end-of-directory slot. And we do it first,
+         * because we want to keep the directory in a readble state.
+         * Note that there is no need to remove it on error, as it is beyond
+         * the visible end of directory anyway.
+         */
+        if (epoc && !nr_slots && last_entry)
+                err = fat_write_zero_entry(dir, pos + free_slots * sizeof(*de));
+       if (err)
+               goto error;
+
        if (free_slots) {
                /*
diff -r -u2 -p linux-2.6.22.unpatched/fs/fat/inode.c linux-2.6.22/fs/fat/inode.c
--- linux-2.6.22.unpatched/fs/fat/inode.c       2007-11-06 22:45:27.000000000 +0100
+++ linux-2.6.22/fs/fat/inode.c 2007-11-06 22:47:36.000000000 +0100
@@ -857,4 +857,5 @@ enum {
        Opt_shortname_winnt, Opt_shortname_mixed, Opt_utf8_no, Opt_utf8_yes,
        Opt_uni_xl_no, Opt_uni_xl_yes, Opt_nonumtail_no, Opt_nonumtail_yes,
+       Opt_epoc,
        Opt_obsolate, Opt_flush, Opt_err,
 };
@@ -879,4 +880,5 @@ static match_table_t fat_tokens = {
        {Opt_debug, "debug"},
        {Opt_immutable, "sys_immutable"},
+       {Opt_epoc, "epoc"},
        {Opt_obsolate, "conv=binary"},
        {Opt_obsolate, "conv=text"},
@@ -1038,4 +1040,8 @@ static int parse_options(char *options, 
                        opts->flush = 1;
                        break;
+               case Opt_epoc:
+                       opts->epoc = 1;
+                       break;
+
 
                /* msdos specific */
diff -r -u2 -p linux-2.6.22.unpatched/include/linux/msdos_fs.h linux-2.6.22/include/linux/msdos_fs.h
--- linux-2.6.22.unpatched/include/linux/msdos_fs.h     2007-11-06 22:46:01.000000000 +0100
+++ linux-2.6.22/include/linux/msdos_fs.h       2007-11-06 22:47:36.000000000 +0100
@@ -45,4 +45,5 @@
 
 #define DELETED_FLAG   0xe5    /* marks file as deleted when in name[0] */
+#define EOD_FLAG 0x00 /* marks end of directory when in name[0] for old fats */
 #define IS_FREE(n)     (!*(n) || *(n) == DELETED_FLAG)
 
@@ -207,4 +208,5 @@ struct fat_mount_options {
                 flush:1,         /* write things quickly */
                 nocase:1,        /* Does this need case conversion? 0=need case conversion*/
+                epoc:1,          /* Filename starting with 0x00 marks end of dir? */
                 usefree:1;       /* Use free_clusters for FAT32 */
 };
1	frodo	308	diff -r -u2 -p linux-2.6.22.unpatched/fs/fat/dir.c linux-2.6.22/fs/fat/dir.c
2			--- linux-2.6.22.unpatched/fs/fat/dir.c 2007-11-06 22:45:27.000000000 +0100
3			+++ linux-2.6.22/fs/fat/dir.c 2007-11-06 22:59:08.000000000 +0100
4			@@ -242,4 +242,5 @@ static int fat_parse_long(struct inode *
5	frodo	303	struct msdos_dir_slot *ds;
6			unsigned char id, slot, slots, alias_checksum;
7			+ int epoc = MSDOS_SB(dir->i_sb)->options.epoc;
8
9			if (!*unicode) {
10	frodo	308	@@ -288,4 +289,8 @@ parse_long:
11	frodo	303	if ((*de)->name[0] == DELETED_FLAG)
12			return PARSE_INVALID;
13	frodo	308	+ if (epoc && ((*de)->name[0] == EOD_FLAG)) {
14			+ while (fat_get_entry(dir, pos, bh, de) >= 0);
15	frodo	303	+ return PARSE_EOF;
16	frodo	308	+ }
17	frodo	303	if ((*de)->attr == ATTR_EXT)
18			goto parse_long;
19	frodo	308	@@ -321,4 +326,5 @@ int fat_search_long(struct inode *inode,
20	frodo	303	loff_t cpos = 0;
21			int chl, i, j, last_u, err;
22			+ int epoc = sbi->options.epoc;
23
24			err = -ENOENT;
25	frodo	308	@@ -330,4 +336,8 @@ parse_record:
26	frodo	303	if (de->name[0] == DELETED_FLAG)
27			continue;
28	frodo	308	+ if (epoc && (de->name[0] == EOD_FLAG)) {
29			+ while (fat_get_entry(inode, &cpos, &bh, &de) >= 0);
30	frodo	303	+ goto EODir;
31	frodo	308	+ }
32	frodo	303	if (de->attr != ATTR_EXT && (de->attr & ATTR_VOLUME))
33			continue;
34	frodo	308	@@ -457,4 +467,6 @@ static int __fat_readdir(struct inode *i
35	frodo	303	loff_t cpos;
36			int ret = 0;
37			+ int epoc = MSDOS_SB(sb)->options.epoc;
38			+
39
40			lock_kernel();
41	frodo	308	@@ -487,4 +499,8 @@ parse_record:
42	frodo	303	long_slots = 0;
43			/* Check for long filename entry */
44	frodo	308	+ if (epoc && (de->name[0] == EOD_FLAG)) {
45			+ while (fat_get_entry(inode, &cpos, &bh, &de) >= 0);
46	frodo	303	+ goto EODir;
47	frodo	308	+ }
48	frodo	303	if (isvfat) {
49			if (de->name[0] == DELETED_FLAG)
50	frodo	308	@@ -810,5 +826,10 @@ static int fat_get_short_entry(struct in
51	frodo	303	struct msdos_dir_entry **de)
52			{
53			+ int epoc = MSDOS_SB(dir->i_sb)->options.epoc;
54			while (fat_get_entry(dir, pos, bh, de) >= 0) {
55	frodo	308	+ if (epoc && ((*de)->name[0] == EOD_FLAG)) {
56			+ while (fat_get_entry(dir, pos, bh, de) >= 0);
57	frodo	303	+ return -ENOENT;
58	frodo	308	+ }
59	frodo	303	/* free entry or long name entry or volume label */
60			if (!IS_FREE((de)->name) && !((de)->attr & ATTR_VOLUME))
61	frodo	308	@@ -1188,4 +1209,23 @@ error:
62	frodo	303	}
63
64			+int fat_write_zero_entry(struct inode *dir, loff_t curr)
65			+{
66			+ struct msdos_dir_entry *de = NULL;
67			+ struct buffer_head *bh = NULL;
68			+ loff_t pos;
69			+ int err = 0;
70			+
71			+ pos = curr;
72			+ if (fat_get_entry(dir,&pos,&bh,&de) < 0)
73			+ return 0;
74			+
75			+ de->name[0] = EOD_FLAG;
76			+ mark_buffer_dirty(bh);
77			+ if (IS_DIRSYNC(dir))
78			+ err = sync_dirty_buffer(bh);
79			+ brelse(bh);
80			+ return err;
81			+}
82			+
83			int fat_add_entries(struct inode dir, void slots, int nr_slots,
84			struct fat_slot_info *sinfo)
85	frodo	308	@@ -1197,4 +1237,6 @@ int fat_add_entries(struct inode *dir, v
86	frodo	303	int err, free_slots, i, nr_bhs;
87			loff_t pos, i_pos;
88			+ int epoc = sbi->options.epoc;
89			+ int last_entry = 0;
90
91			sinfo->nr_slots = nr_slots;
92	frodo	308	@@ -1210,5 +1252,7 @@ int fat_add_entries(struct inode *dir, v
93	frodo	303	goto error;
94
95			- if (IS_FREE(de->name)) {
96			+ if (epoc && (de->name[0] == EOD_FLAG))
97			+ last_entry = 1;
98			+ if (last_entry \|\| IS_FREE(de->name)) {
99			if (prev != bh) {
100			get_bh(bh);
101	frodo	308	@@ -1240,4 +1284,15 @@ found:
102	frodo	303	pos -= free_slots * sizeof(*de);
103			nr_slots -= free_slots;
104			+
105			+ /* We need to write an end-of-directory slot. And we do it first,
106			+ * because we want to keep the directory in a readble state.
107			+ * Note that there is no need to remove it on error, as it is beyond
108			+ * the visible end of directory anyway.
109			+ */
110			+ if (epoc && !nr_slots && last_entry)
111			+ err = fat_write_zero_entry(dir, pos + free_slots * sizeof(*de));
112			+ if (err)
113			+ goto error;
114			+
115			if (free_slots) {
116			/*
117	frodo	308	diff -r -u2 -p linux-2.6.22.unpatched/fs/fat/inode.c linux-2.6.22/fs/fat/inode.c
118			--- linux-2.6.22.unpatched/fs/fat/inode.c 2007-11-06 22:45:27.000000000 +0100
119			+++ linux-2.6.22/fs/fat/inode.c 2007-11-06 22:47:36.000000000 +0100
120			@@ -857,4 +857,5 @@ enum {
121	frodo	303	Opt_shortname_winnt, Opt_shortname_mixed, Opt_utf8_no, Opt_utf8_yes,
122			Opt_uni_xl_no, Opt_uni_xl_yes, Opt_nonumtail_no, Opt_nonumtail_yes,
123			+ Opt_epoc,
124			Opt_obsolate, Opt_flush, Opt_err,
125			};
126	frodo	308	@@ -879,4 +880,5 @@ static match_table_t fat_tokens = {
127	frodo	303	{Opt_debug, "debug"},
128			{Opt_immutable, "sys_immutable"},
129			+ {Opt_epoc, "epoc"},
130			{Opt_obsolate, "conv=binary"},
131			{Opt_obsolate, "conv=text"},
132	frodo	308	@@ -1038,4 +1040,8 @@ static int parse_options(char *options,
133	frodo	303	opts->flush = 1;
134			break;
135			+ case Opt_epoc:
136			+ opts->epoc = 1;
137			+ break;
138			+
139
140			/* msdos specific */
141	frodo	308	diff -r -u2 -p linux-2.6.22.unpatched/include/linux/msdos_fs.h linux-2.6.22/include/linux/msdos_fs.h
142			--- linux-2.6.22.unpatched/include/linux/msdos_fs.h 2007-11-06 22:46:01.000000000 +0100
143			+++ linux-2.6.22/include/linux/msdos_fs.h 2007-11-06 22:47:36.000000000 +0100
144			@@ -45,4 +45,5 @@
145	frodo	303
146			#define DELETED_FLAG 0xe5 /* marks file as deleted when in name[0] */
147			+#define EOD_FLAG 0x00 /* marks end of directory when in name[0] for old fats */
148			#define IS_FREE(n) (!(n) \|\| (n) == DELETED_FLAG)
149
150	frodo	308	@@ -207,4 +208,5 @@ struct fat_mount_options {
151	frodo	303	flush:1, /* write things quickly */
152			nocase:1, /* Does this need case conversion? 0=need case conversion*/
153	frodo	306	+ epoc:1, /* Filename starting with 0x00 marks end of dir? */
154	frodo	303	usefree:1; /* Use free_clusters for FAT32 */
155			};
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