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[/] [test_project/] [trunk/] [linux_sd_driver/] [fs/] [isofs/] [namei.c] - Blame information for rev 62

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/*
 *  linux/fs/isofs/namei.c
 *
 *  (C) 1992  Eric Youngdale Modified for ISO 9660 filesystem.
 *
 *  (C) 1991  Linus Torvalds - minix filesystem
 */
 
#include <linux/smp_lock.h>
#include "isofs.h"
 
/*
 * ok, we cannot use strncmp, as the name is not in our data space.
 * Thus we'll have to use isofs_match. No big problem. Match also makes
 * some sanity tests.
 */
static int
isofs_cmp(struct dentry *dentry, const char *compare, int dlen)
{
        struct qstr qstr;
 
        if (!compare)
                return 1;
 
        /* check special "." and ".." files */
        if (dlen == 1) {
                /* "." */
                if (compare[0] == 0) {
                        if (!dentry->d_name.len)
                                return 0;
                        compare = ".";
                } else if (compare[0] == 1) {
                        compare = "..";
                        dlen = 2;
                }
        }
 
        qstr.name = compare;
        qstr.len = dlen;
        return dentry->d_op->d_compare(dentry, &dentry->d_name, &qstr);
}
 
/*
 *      isofs_find_entry()
 *
 * finds an entry in the specified directory with the wanted name. It
 * returns the inode number of the found entry, or 0 on error.
 */
static unsigned long
isofs_find_entry(struct inode *dir, struct dentry *dentry,
        unsigned long *block_rv, unsigned long *offset_rv,
        char *tmpname, struct iso_directory_record *tmpde)
{
        unsigned long bufsize = ISOFS_BUFFER_SIZE(dir);
        unsigned char bufbits = ISOFS_BUFFER_BITS(dir);
        unsigned long block, f_pos, offset, block_saved, offset_saved;
        struct buffer_head *bh = NULL;
        struct isofs_sb_info *sbi = ISOFS_SB(dir->i_sb);
 
        if (!ISOFS_I(dir)->i_first_extent)
                return 0;
 
        f_pos = 0;
        offset = 0;
        block = 0;
 
        while (f_pos < dir->i_size) {
                struct iso_directory_record *de;
                int de_len, match, i, dlen;
                char *dpnt;
 
                if (!bh) {
                        bh = isofs_bread(dir, block);
                        if (!bh)
                                return 0;
                }
 
                de = (struct iso_directory_record *) (bh->b_data + offset);
 
                de_len = *(unsigned char *) de;
                if (!de_len) {
                        brelse(bh);
                        bh = NULL;
                        f_pos = (f_pos + ISOFS_BLOCK_SIZE) & ~(ISOFS_BLOCK_SIZE - 1);
                        block = f_pos >> bufbits;
                        offset = 0;
                        continue;
                }
 
                block_saved = bh->b_blocknr;
                offset_saved = offset;
                offset += de_len;
                f_pos += de_len;
 
                /* Make sure we have a full directory entry */
                if (offset >= bufsize) {
                        int slop = bufsize - offset + de_len;
                        memcpy(tmpde, de, slop);
                        offset &= bufsize - 1;
                        block++;
                        brelse(bh);
                        bh = NULL;
                        if (offset) {
                                bh = isofs_bread(dir, block);
                                if (!bh)
                                        return 0;
                                memcpy((void *) tmpde + slop, bh->b_data, offset);
                        }
                        de = tmpde;
                }
 
                dlen = de->name_len[0];
                dpnt = de->name;
 
                if (sbi->s_rock &&
                    ((i = get_rock_ridge_filename(de, tmpname, dir)))) {
                        dlen = i;       /* possibly -1 */
                        dpnt = tmpname;
#ifdef CONFIG_JOLIET
                } else if (sbi->s_joliet_level) {
                        dlen = get_joliet_filename(de, tmpname, dir);
                        dpnt = tmpname;
#endif
                } else if (sbi->s_mapping == 'a') {
                        dlen = get_acorn_filename(de, tmpname, dir);
                        dpnt = tmpname;
                } else if (sbi->s_mapping == 'n') {
                        dlen = isofs_name_translate(de, tmpname, dir);
                        dpnt = tmpname;
                }
 
                /*
                 * Skip hidden or associated files unless hide or showassoc,
                 * respectively, is set
                 */
                match = 0;
                if (dlen > 0 &&
                        (sbi->s_hide =='n' ||
                                (!(de->flags[-sbi->s_high_sierra] & 1))) &&
                        (sbi->s_showassoc =='y' ||
                                (!(de->flags[-sbi->s_high_sierra] & 4)))) {
                        match = (isofs_cmp(dentry, dpnt, dlen) == 0);
                }
                if (match) {
                        isofs_normalize_block_and_offset(de,
                                                         &block_saved,
                                                         &offset_saved);
                        *block_rv = block_saved;
                        *offset_rv = offset_saved;
                        brelse(bh);
                        return 1;
                }
        }
        brelse(bh);
        return 0;
}
 
struct dentry *isofs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
{
        int found;
        unsigned long uninitialized_var(block);
        unsigned long uninitialized_var(offset);
        struct inode *inode;
        struct page *page;
 
        dentry->d_op = dir->i_sb->s_root->d_op;
 
        page = alloc_page(GFP_USER);
        if (!page)
                return ERR_PTR(-ENOMEM);
 
        lock_kernel();
        found = isofs_find_entry(dir, dentry,
                                &block, &offset,
                                page_address(page),
                                1024 + page_address(page));
        __free_page(page);
 
        inode = NULL;
        if (found) {
                inode = isofs_iget(dir->i_sb, block, offset);
                if (!inode) {
                        unlock_kernel();
                        return ERR_PTR(-EACCES);
                }
        }
        unlock_kernel();
        return d_splice_alias(inode, dentry);
}

Line No.	Rev	Author	Line
1	62	marcus.erl	`/*`
2			`* linux/fs/isofs/namei.c`
3			`*`
4			`* (C) 1992 Eric Youngdale Modified for ISO 9660 filesystem.`
5			`*`
6			`* (C) 1991 Linus Torvalds - minix filesystem`
7			`*/`
8
9			`#include <linux/smp_lock.h>`
10			`#include "isofs.h"`
11
12			`/*`
13			`* ok, we cannot use strncmp, as the name is not in our data space.`
14			`* Thus we'll have to use isofs_match. No big problem. Match also makes`
15			`* some sanity tests.`
16			`*/`
17			`static int`
18			`isofs_cmp(struct dentry dentry, const char compare, int dlen)`
19			`{`
20			`struct qstr qstr;`
21
22			`if (!compare)`
23			`return 1;`
24
25			`/* check special "." and ".." files */`
26			`if (dlen == 1) {`
27			`/* "." */`
28			`if (compare[0] == 0) {`
29			`if (!dentry->d_name.len)`
30			`return 0;`
31			`compare = ".";`
32			`} else if (compare[0] == 1) {`
33			`compare = "..";`
34			`dlen = 2;`
35			`}`
36			`}`
37
38			`qstr.name = compare;`
39			`qstr.len = dlen;`
40			`return dentry->d_op->d_compare(dentry, &dentry->d_name, &qstr);`
41			`}`
42
43			`/*`
44			`* isofs_find_entry()`
45			`*`
46			`* finds an entry in the specified directory with the wanted name. It`
47			`* returns the inode number of the found entry, or 0 on error.`
48			`*/`
49			`static unsigned long`
50			`isofs_find_entry(struct inode dir, struct dentry dentry,`
51			`unsigned long block_rv, unsigned long offset_rv,`
52			`char tmpname, struct iso_directory_record tmpde)`
53			`{`
54			`unsigned long bufsize = ISOFS_BUFFER_SIZE(dir);`
55			`unsigned char bufbits = ISOFS_BUFFER_BITS(dir);`
56			`unsigned long block, f_pos, offset, block_saved, offset_saved;`
57			`struct buffer_head *bh = NULL;`
58			`struct isofs_sb_info *sbi = ISOFS_SB(dir->i_sb);`
59
60			`if (!ISOFS_I(dir)->i_first_extent)`
61			`return 0;`
62
63			`f_pos = 0;`
64			`offset = 0;`
65			`block = 0;`
66
67			`while (f_pos < dir->i_size) {`
68			`struct iso_directory_record *de;`
69			`int de_len, match, i, dlen;`
70			`char *dpnt;`
71
72			`if (!bh) {`
73			`bh = isofs_bread(dir, block);`
74			`if (!bh)`
75			`return 0;`
76			`}`
77
78			`de = (struct iso_directory_record *) (bh->b_data + offset);`
79
80			`de_len = (unsigned char ) de;`
81			`if (!de_len) {`
82			`brelse(bh);`
83			`bh = NULL;`
84			`f_pos = (f_pos + ISOFS_BLOCK_SIZE) & ~(ISOFS_BLOCK_SIZE - 1);`
85			`block = f_pos >> bufbits;`
86			`offset = 0;`
87			`continue;`
88			`}`
89
90			`block_saved = bh->b_blocknr;`
91			`offset_saved = offset;`
92			`offset += de_len;`
93			`f_pos += de_len;`
94
95			`/* Make sure we have a full directory entry */`
96			`if (offset >= bufsize) {`
97			`int slop = bufsize - offset + de_len;`
98			`memcpy(tmpde, de, slop);`
99			`offset &= bufsize - 1;`
100			`block++;`
101			`brelse(bh);`
102			`bh = NULL;`
103			`if (offset) {`
104			`bh = isofs_bread(dir, block);`
105			`if (!bh)`
106			`return 0;`
107			`memcpy((void *) tmpde + slop, bh->b_data, offset);`
108			`}`
109			`de = tmpde;`
110			`}`
111
112			`dlen = de->name_len[0];`
113			`dpnt = de->name;`
114
115			`if (sbi->s_rock &&`
116			`((i = get_rock_ridge_filename(de, tmpname, dir)))) {`
117			`dlen = i; /* possibly -1 */`
118			`dpnt = tmpname;`
119			`#ifdef CONFIG_JOLIET`
120			`} else if (sbi->s_joliet_level) {`
121			`dlen = get_joliet_filename(de, tmpname, dir);`
122			`dpnt = tmpname;`
123			`#endif`
124			`} else if (sbi->s_mapping == 'a') {`
125			`dlen = get_acorn_filename(de, tmpname, dir);`
126			`dpnt = tmpname;`
127			`} else if (sbi->s_mapping == 'n') {`
128			`dlen = isofs_name_translate(de, tmpname, dir);`
129			`dpnt = tmpname;`
130			`}`
131
132			`/*`
133			`* Skip hidden or associated files unless hide or showassoc,`
134			`* respectively, is set`
135			`*/`
136			`match = 0;`
137			`if (dlen > 0 &&`
138			`(sbi->s_hide =='n' \|\|`
139			`(!(de->flags[-sbi->s_high_sierra] & 1))) &&`
140			`(sbi->s_showassoc =='y' \|\|`
141			`(!(de->flags[-sbi->s_high_sierra] & 4)))) {`
142			`match = (isofs_cmp(dentry, dpnt, dlen) == 0);`
143			`}`
144			`if (match) {`
145			`isofs_normalize_block_and_offset(de,`
146			`&block_saved,`
147			`&offset_saved);`
148			`*block_rv = block_saved;`
149			`*offset_rv = offset_saved;`
150			`brelse(bh);`
151			`return 1;`
152			`}`
153			`}`
154			`brelse(bh);`
155			`return 0;`
156			`}`
157
158			`struct dentry isofs_lookup(struct inode dir, struct dentry dentry, struct nameidata nd)`
159			`{`
160			`int found;`
161			`unsigned long uninitialized_var(block);`
162			`unsigned long uninitialized_var(offset);`
163			`struct inode *inode;`
164			`struct page *page;`
165
166			`dentry->d_op = dir->i_sb->s_root->d_op;`
167
168			`page = alloc_page(GFP_USER);`
169			`if (!page)`
170			`return ERR_PTR(-ENOMEM);`
171
172			`lock_kernel();`
173			`found = isofs_find_entry(dir, dentry,`
174			`&block, &offset,`
175			`page_address(page),`
176			`1024 + page_address(page));`
177			`__free_page(page);`
178
179			`inode = NULL;`
180			`if (found) {`
181			`inode = isofs_iget(dir->i_sb, block, offset);`
182			`if (!inode) {`
183			`unlock_kernel();`
184			`return ERR_PTR(-EACCES);`
185			`}`
186			`}`
187			`unlock_kernel();`
188			`return d_splice_alias(inode, dentry);`
189			`}`

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[/] [test_project/] [trunk/] [linux_sd_driver/] [fs/] [isofs/] [namei.c] - Blame information for rev 62