Release 4.10 fs/coda/dir.c

/*
 * Directory operations for Coda filesystem
 * Original version: (C) 1996 P. Braam and M. Callahan
 * Rewritten for Linux 2.1. (C) 1997 Carnegie Mellon University
 * 
 * Carnegie Mellon encourages users to contribute improvements to
 * the Coda project. Contact Peter Braam (coda@cs.cmu.edu).
 */

#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/time.h>
#include <linux/fs.h>
#include <linux/slab.h>
#include <linux/file.h>
#include <linux/stat.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/spinlock.h>
#include <linux/namei.h>
#include <linux/uaccess.h>

#include <linux/coda.h>
#include <linux/coda_psdev.h>
#include "coda_linux.h"
#include "coda_cache.h"

#include "coda_int.h"

/* same as fs/bad_inode.c */


static int coda_return_EIO(void)
{
	return -EIO;
}
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#define CODA_EIO_ERROR ((void *) (coda_return_EIO))

/* inode operations for directories */
/* access routines: lookup, readlink, permission */


static struct dentry *coda_lookup(struct inode *dir, struct dentry *entry, unsigned int flags)
{
	struct super_block *sb = dir->i_sb;
	const char *name = entry->d_name.name;
	size_t length = entry->d_name.len;
	struct inode *inode;
	int type = 0;

	if (length > CODA_MAXNAMLEN) {
		pr_err("name too long: lookup, %s (%*s)\n",
		       coda_i2s(dir), (int)length, name);
		return ERR_PTR(-ENAMETOOLONG);
	}

	/* control object, create inode on the fly */
	if (is_root_inode(dir) && coda_iscontrol(name, length)) {
		inode = coda_cnode_makectl(sb);
		type = CODA_NOCACHE;
	} else {
		struct CodaFid fid = { { 0, } };
		int error = venus_lookup(sb, coda_i2f(dir), name, length,
				     &type, &fid);
		inode = !error ? coda_cnode_make(&fid, sb) : ERR_PTR(error);
	}

	if (!IS_ERR(inode) && (type & CODA_NOCACHE))
		coda_flag_inode(inode, C_VATTR | C_PURGE);

	if (inode == ERR_PTR(-ENOENT))
		inode = NULL;

	return d_splice_alias(inode, entry);
}


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136
61.82%
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al viro
al viro
66
30.00%
4
28.57%
jan harkes
jan harkes
16
7.27%
1
7.14%
trond myklebust
trond myklebust
1
0.45%
1
7.14%
fabian frederick
fabian frederick
1
0.45%
1
7.14%
Total
220
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14
100.00%



int coda_permission(struct inode *inode, int mask)
{
	int error;

	if (mask & MAY_NOT_BLOCK)
		return -ECHILD;

	mask &= MAY_READ | MAY_WRITE | MAY_EXEC;
 
	if (!mask)
		return 0;

	if ((mask & MAY_EXEC) && !execute_ok(inode))
		return -EACCES;

	if (coda_cache_check(inode, mask))
		return 0;

	error = venus_access(inode->i_sb, coda_i2f(inode), mask);
    
	if (!error)
		coda_cache_enter(inode, mask);

	return error;
}


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63
61.17%
3
33.33%
miklos szeredi
miklos szeredi
18
17.48%
1
11.11%
al viro
al viro
10
9.71%
2
22.22%
nick piggin
nick piggin
8
7.77%
1
11.11%
yoshihisa abe
yoshihisa abe
3
2.91%
1
11.11%
jan harkes
jan harkes
1
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1
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103
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9
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static inline void coda_dir_update_mtime(struct inode *dir)
{
#ifdef REQUERY_VENUS_FOR_MTIME
	/* invalidate the directory cnode's attributes so we refetch the
         * attributes from venus next time the inode is referenced */
	coda_flag_inode(dir, C_VATTR);
#else
	/* optimistically we can also act as if our nose bleeds. The
         * granularity of the mtime is coarse anyways so we might actually be
         * right most of the time. Note: we only do this for directories. */
	dir->i_mtime = dir->i_ctime = current_time(dir);
#endif
}

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jan harkes
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17.07%
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deepa dinamani
deepa dinamani
4
9.76%
1
25.00%
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41
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4
100.00%

/* we have to wrap inc_nlink/drop_nlink because sometimes userspace uses a
 * trick to fool GNU find's optimizations. If we can't be sure of the link
 * (because of volume mount points) we set i_nlink to 1 which forces find
 * to consider every child as a possible directory. We should also never
 * see an increment or decrement for deleted directories where i_nlink == 0 */


static inline void coda_dir_inc_nlink(struct inode *dir)
{
	if (dir->i_nlink >= 2)
		inc_nlink(dir);
}

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static inline void coda_dir_drop_nlink(struct inode *dir)
{
	if (dir->i_nlink > 2)
		drop_nlink(dir);
}

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/* creation routines: create, mknod, mkdir, link, symlink */


static int coda_create(struct inode *dir, struct dentry *de, umode_t mode, bool excl)
{
	int error;
	const char *name=de->d_name.name;
	int length=de->d_name.len;
	struct inode *inode;
	struct CodaFid newfid;
	struct coda_vattr attrs;

	if (is_root_inode(dir) && coda_iscontrol(name, length))
		return -EPERM;

	error = venus_create(dir->i_sb, coda_i2f(dir), name, length, 
				0, mode, &newfid, &attrs);
	if (error)
		goto err_out;

	inode = coda_iget(dir->i_sb, &newfid, &attrs);
	if (IS_ERR(inode)) {
		error = PTR_ERR(inode);
		goto err_out;
	}

	/* invalidate the directory cnode's attributes */
	coda_dir_update_mtime(dir);
	d_instantiate(de, inode);
	return 0;
err_out:
	d_drop(de);
	return error;
}

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5
38.46%
jan harkes
jan harkes
20
11.70%
3
23.08%
yoshihisa abe
yoshihisa abe
19
11.11%
1
7.69%
al viro
al viro
4
2.34%
3
23.08%
trond myklebust
trond myklebust
1
0.58%
1
7.69%
Total
171
100.00%
13
100.00%



static int coda_mkdir(struct inode *dir, struct dentry *de, umode_t mode)
{
	struct inode *inode;
	struct coda_vattr attrs;
	const char *name = de->d_name.name;
	int len = de->d_name.len;
	int error;
	struct CodaFid newfid;

	if (is_root_inode(dir) && coda_iscontrol(name, len))
		return -EPERM;

	attrs.va_mode = mode;
	error = venus_mkdir(dir->i_sb, coda_i2f(dir), 
			       name, len, &newfid, &attrs);
	if (error)
		goto err_out;
         
	inode = coda_iget(dir->i_sb, &newfid, &attrs);
	if (IS_ERR(inode)) {
		error = PTR_ERR(inode);
		goto err_out;
	}

	/* invalidate the directory cnode's attributes */
	coda_dir_inc_nlink(dir);
	coda_dir_update_mtime(dir);
	d_instantiate(de, inode);
	return 0;
err_out:
	d_drop(de);
	return error;
}

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45.45%
jan harkes
jan harkes
25
14.29%
3
27.27%
yoshihisa abe
yoshihisa abe
19
10.86%
1
9.09%
al viro
al viro
2
1.14%
2
18.18%
Total
175
100.00%
11
100.00%

/* try to make de an entry in dir_inodde linked to source_de */ 


static int coda_link(struct dentry *source_de, struct inode *dir_inode, 
	  struct dentry *de)
{
	struct inode *inode = d_inode(source_de);
        const char * name = de->d_name.name;
	int len = de->d_name.len;
	int error;

	if (is_root_inode(dir_inode) && coda_iscontrol(name, len))
		return -EPERM;

	error = venus_link(dir_inode->i_sb, coda_i2f(inode),
			   coda_i2f(dir_inode), (const char *)name, len);
	if (error) {
		d_drop(de);
		return error;
	}

	coda_dir_update_mtime(dir_inode);
	ihold(inode);
	d_instantiate(de, inode);
	inc_nlink(inode);
	return 0;
}


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126
90.65%
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yoshihisa abe
yoshihisa abe
4
2.88%
1
10.00%
dave hansen
dave hansen
3
2.16%
1
10.00%
david howells
david howells
3
2.16%
1
10.00%
al viro
al viro
2
1.44%
2
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jan harkes
jan harkes
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static int coda_symlink(struct inode *dir_inode, struct dentry *de,
			const char *symname)
{
	const char *name = de->d_name.name;
	int len = de->d_name.len;
	int symlen;
	int error;

	if (is_root_inode(dir_inode) && coda_iscontrol(name, len))
		return -EPERM;

	symlen = strlen(symname);
	if (symlen > CODA_MAXPATHLEN)
		return -ENAMETOOLONG;

	/*
         * This entry is now negative. Since we do not create
         * an inode for the entry we have to drop it.
         */
	d_drop(de);
	error = venus_symlink(dir_inode->i_sb, coda_i2f(dir_inode), name, len,
			      symname, symlen);

	/* mtime is no good anymore */
	if (!error)
		coda_dir_update_mtime(dir_inode);

	return error;
}

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97.58%
5
71.43%
jan harkes
jan harkes
2
1.61%
1
14.29%
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al viro
1
0.81%
1
14.29%
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124
100.00%
7
100.00%

/* destruction routines: unlink, rmdir */


static int coda_unlink(struct inode *dir, struct dentry *de)
{
        int error;
	const char *name = de->d_name.name;
	int len = de->d_name.len;

	error = venus_remove(dir->i_sb, coda_i2f(dir), name, len);
	if (error)
		return error;

	coda_dir_update_mtime(dir);
	drop_nlink(d_inode(de));
	return 0;
}

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pre-git
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72
90.00%
2
33.33%
david howells
david howells
3
3.75%
1
16.67%
dave hansen
dave hansen
3
3.75%
1
16.67%
harvey harrison
harvey harrison
1
1.25%
1
16.67%
jan harkes
jan harkes
1
1.25%
1
16.67%
Total
80
100.00%
6
100.00%



static int coda_rmdir(struct inode *dir, struct dentry *de)
{
	const char *name = de->d_name.name;
	int len = de->d_name.len;
	int error;

	error = venus_rmdir(dir->i_sb, coda_i2f(dir), name, len);
	if (!error) {
		/* VFS may delete the child */
		if (d_really_is_positive(de))
			clear_nlink(d_inode(de));

		/* fix the link count of the parent */
		coda_dir_drop_nlink(dir);
		coda_dir_update_mtime(dir);
	}
	return error;
}

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67
71.28%
2
25.00%
jan harkes
jan harkes
16
17.02%
2
25.00%
david howells
david howells
6
6.38%
1
12.50%
miklos szeredi
miklos szeredi
3
3.19%
1
12.50%
al viro
al viro
1
1.06%
1
12.50%
harvey harrison
harvey harrison
1
1.06%
1
12.50%
Total
94
100.00%
8
100.00%

/* rename */


static int coda_rename(struct inode *old_dir, struct dentry *old_dentry,
		       struct inode *new_dir, struct dentry *new_dentry,
		       unsigned int flags)
{
	const char *old_name = old_dentry->d_name.name;
	const char *new_name = new_dentry->d_name.name;
	int old_length = old_dentry->d_name.len;
	int new_length = new_dentry->d_name.len;
	int error;

	if (flags)
		return -EINVAL;

	error = venus_rename(old_dir->i_sb, coda_i2f(old_dir),
			     coda_i2f(new_dir), old_length, new_length,
			     (const char *) old_name, (const char *)new_name);
	if (!error) {
		if (d_really_is_positive(new_dentry)) {
			if (d_is_dir(new_dentry)) {
				coda_dir_drop_nlink(old_dir);
				coda_dir_inc_nlink(new_dir);
			}
			coda_dir_update_mtime(old_dir);
			coda_dir_update_mtime(new_dir);
			coda_flag_inode(d_inode(new_dentry), C_VATTR);
		} else {
			coda_flag_inode(old_dir, C_VATTR);
			coda_flag_inode(new_dir, C_VATTR);
		}
	}
	return error;
}

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pre-git
pre-git
85
44.04%
2
20.00%
fabian frederick
fabian frederick
62
32.12%
1
10.00%
al viro
al viro
19
9.84%
1
10.00%
miklos szeredi
miklos szeredi
12
6.22%
1
10.00%
jan harkes
jan harkes
8
4.15%
3
30.00%
david howells
david howells
7
3.63%
2
20.00%
Total
193
100.00%
10
100.00%



static inline unsigned int CDT2DT(unsigned char cdt)
{
	unsigned int dt;

	switch(cdt) {
	case CDT_UNKNOWN: dt = DT_UNKNOWN; break;
	case CDT_FIFO:	  dt = DT_FIFO;    break;
	case CDT_CHR:	  dt = DT_CHR;     break;
	case CDT_DIR:	  dt = DT_DIR;     break;
	case CDT_BLK:	  dt = DT_BLK;     break;
	case CDT_REG:	  dt = DT_REG;     break;
	case CDT_LNK:	  dt = DT_LNK;     break;
	case CDT_SOCK:	  dt = DT_SOCK;    break;
	case CDT_WHT:	  dt = DT_WHT;     break;
	default:	  dt = DT_UNKNOWN; break;
	}
	return dt;
}

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jan harkes
jan harkes
88
85.44%
1
20.00%
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pre-git
12
11.65%
2
40.00%
linus torvalds
linus torvalds
3
2.91%
2
40.00%
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103
100.00%
5
100.00%

/* support routines */


static int coda_venus_readdir(struct file *coda_file, struct dir_context *ctx)
{
	struct coda_file_info *cfi;
	struct coda_inode_info *cii;
	struct file *host_file;
	struct venus_dirent *vdir;
	unsigned long vdir_size = offsetof(struct venus_dirent, d_name);
	unsigned int type;
	struct qstr name;
	ino_t ino;
	int ret;

	cfi = CODA_FTOC(coda_file);
	BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC);
	host_file = cfi->cfi_container;

	cii = ITOC(file_inode(coda_file));

	vdir = kmalloc(sizeof(*vdir), GFP_KERNEL);
	if (!vdir) return -ENOMEM;

	if (!dir_emit_dots(coda_file, ctx))
		goto out;

	while (1) {
		/* read entries from the directory file */
		ret = kernel_read(host_file, ctx->pos - 2, (char *)vdir,
				  sizeof(*vdir));
		if (ret < 0) {
			pr_err("%s: read dir %s failed %d\n",
			       __func__, coda_f2s(&cii->c_fid), ret);
			break;
		}
		if (ret == 0) break; /* end of directory file reached */

		/* catch truncated reads */
		if (ret < vdir_size || ret < vdir_size + vdir->d_namlen) {
			pr_err("%s: short read on %s\n",
			       __func__, coda_f2s(&cii->c_fid));
			ret = -EBADF;
			break;
		}
		/* validate whether the directory file actually makes sense */
		if (vdir->d_reclen < vdir_size + vdir->d_namlen) {
			pr_err("%s: invalid dir %s\n",
			       __func__, coda_f2s(&cii->c_fid));
			ret = -EBADF;
			break;
		}

		name.len = vdir->d_namlen;
		name.name = vdir->d_name;

		/* Make sure we skip '.' and '..', we already got those */
		if (name.name[0] == '.' && (name.len == 1 ||
		    (name.name[1] == '.' && name.len == 2)))
			vdir->d_fileno = name.len = 0;

		/* skip null entries */
		if (vdir->d_fileno && name.len) {
			ino = vdir->d_fileno;
			type = CDT2DT(vdir->d_type);
			if (!dir_emit(ctx, name.name, name.len, ino, type))
				break;
		}
		/* we'll always have progress because d_reclen is unsigned and
                 * we've already established it is non-zero. */
		ctx->pos += vdir->d_reclen;
	}
out:
	kfree(vdir);
	return 0;
}

Contributors
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jan harkes
jan harkes
211
52.36%
3
23.08%
fabian frederick
fabian frederick
90
22.33%
3
23.08%
pre-git
pre-git
80
19.85%
3
23.08%
al viro
al viro
22
5.46%
4
30.77%
Total
403
100.00%
13
100.00%

/* file operations for directories */


static int coda_readdir(struct file *coda_file, struct dir_context *ctx)
{
	struct coda_file_info *cfi;
	struct file *host_file;
	int ret;

	cfi = CODA_FTOC(coda_file);
	BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC);
	host_file = cfi->cfi_container;

	if (host_file->f_op->iterate || host_file->f_op->iterate_shared) {
		struct inode *host_inode = file_inode(host_file);
		ret = -ENOENT;
		if (!IS_DEADDIR(host_inode)) {
			if (host_file->f_op->iterate_shared) {
				inode_lock_shared(host_inode);
				ret = host_file->f_op->iterate_shared(host_file, ctx);
				file_accessed(host_file);
				inode_unlock_shared(host_inode);
			} else {
				inode_lock(host_inode);
				ret = host_file->f_op->iterate(host_file, ctx);
				file_accessed(host_file);
				inode_unlock(host_inode);
			}
		}
		return ret;
	}
	/* Venus: we must read Venus dirents from a file */
	return coda_venus_readdir(coda_file, ctx);
}

Contributors
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fabian frederick
fabian frederick
98
55.68%
1
11.11%
al viro
al viro
57
32.39%
3
33.33%
pre-git
pre-git
18
10.23%
3
33.33%
jan harkes
jan harkes
3
1.70%
2
22.22%
Total
176
100.00%
9
100.00%

/* called when a cache lookup succeeds */


static int coda_dentry_revalidate(struct dentry *de, unsigned int flags)
{
	struct inode *inode;
	struct coda_inode_info *cii;

	if (flags & LOOKUP_RCU)
		return -ECHILD;

	inode = d_inode(de);
	if (!inode || is_root_inode(inode))
		goto out;
	if (is_bad_inode(inode))
		goto bad;

	cii = ITOC(d_inode(de));
	if (!(cii->c_flags & (C_PURGE | C_FLUSH)))
		goto out;

	shrink_dcache_parent(de);

	/* propagate for a flush */
	if (cii->c_flags & C_FLUSH) 
		coda_flag_inode_children(inode, C_FLUSH);

	if (d_count(de) > 1)
		/* pretend it's valid, but don't change the flags */
		goto out;

	/* clear the flags. */
	spin_lock(&cii->c_lock);
	cii->c_flags &= ~(C_VATTR | C_PURGE | C_FLUSH);
	spin_unlock(&cii->c_lock);
bad:
	return 0;
out:
	return 1;
}

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pre-git
pre-git
120
71.86%
8
50.00%
yoshihisa abe
yoshihisa abe
17
10.18%
2
12.50%
nick piggin
nick piggin
14
8.38%
1
6.25%
al viro
al viro
7
4.19%
3
18.75%
david howells
david howells
6
3.59%
1
6.25%
jan harkes
jan harkes
3
1.80%
1
6.25%
Total
167
100.00%
16
100.00%

/*
 * This is the callback from dput() when d_count is going to 0.
 * We use this to unhash dentries with bad inodes.
 */


static int coda_dentry_delete(const struct dentry * dentry)
{
	int flags;

	if (d_really_is_negative(dentry)) 
		return 0;

	flags = (ITOC(d_inode(dentry))->c_flags) & C_PURGE;
	if (is_bad_inode(d_inode(dentry)) || flags) {
		return 1;
	}
	return 0;
}



Contributors
Person
Tokens
Prop
Commits
CommitProp
pre-git
pre-git
51
83.61%
2
50.00%
david howells
david howells
9
14.75%
1
25.00%
nick piggin
nick piggin
1
1.64%
1
25.00%
Total
61
100.00%
4
100.00%

/*
 * This is called when we want to check if the inode has
 * changed on the server.  Coda makes this easy since the
 * cache manager Venus issues a downcall to the kernel when this 
 * happens 
 */


int coda_revalidate_inode(struct inode *inode)
{
	struct coda_vattr attr;
	int error;
	int old_mode;
	ino_t old_ino;
	struct coda_inode_info *cii = ITOC(inode);

	if (!cii->c_flags)
		return 0;

	if (cii->c_flags & (C_VATTR | C_PURGE | C_FLUSH)) {
		error = venus_getattr(inode->i_sb, &(cii->c_fid), &attr);
		if (error)
			return -EIO;

		/* this inode may be lost if:
                   - it's ino changed 
                   - type changes must be permitted for repair and
                   missing mount points.
                */
		old_mode = inode->i_mode;
		old_ino = inode->i_ino;
		coda_vattr_to_iattr(inode, &attr);

		if ((old_mode & S_IFMT) != (inode->i_mode & S_IFMT)) {
			pr_warn("inode %ld, fid %s changed type!\n",
				inode->i_ino, coda_f2s(&(cii->c_fid)));
		}

		/* the following can happen when a local fid is replaced 
                   with a global one, here we lose and declare the inode bad */
		if (inode->i_ino != old_ino)
			return -EIO;
		
		coda_flag_inode_children(inode, C_FLUSH);

		spin_lock(&cii->c_lock);
		cii->c_flags &= ~(C_VATTR | C_PURGE | C_FLUSH);
		spin_unlock(&cii->c_lock);
	}
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
pre-git
pre-git
164
83.67%
3
33.33%
yoshihisa abe
yoshihisa abe
27
13.78%
2
22.22%
fabian frederick
fabian frederick
2
1.02%
2
22.22%
al viro
al viro
2
1.02%
1
11.11%
linus torvalds
linus torvalds
1
0.51%
1
11.11%
Total
196
100.00%
9
100.00%


const struct dentry_operations coda_dentry_operations = {
	.d_revalidate	= coda_dentry_revalidate,
	.d_delete	= coda_dentry_delete,
};


const struct inode_operations coda_dir_inode_operations = {
	.create		= coda_create,
	.lookup		= coda_lookup,
	.link		= coda_link,
	.unlink		= coda_unlink,
	.symlink	= coda_symlink,
	.mkdir		= coda_mkdir,
	.rmdir		= coda_rmdir,
	.mknod		= CODA_EIO_ERROR,
	.rename		= coda_rename,
	.permission	= coda_permission,
	.getattr	= coda_getattr,
	.setattr	= coda_setattr,
};


const struct file_operations coda_dir_operations = {
	.llseek		= generic_file_llseek,
	.read		= generic_read_dir,
	.iterate	= coda_readdir,
	.open		= coda_open,
	.release	= coda_release,
	.fsync		= coda_fsync,
};
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
pre-git
pre-git
1453
53.85%
20
25.97%
jan harkes
jan harkes
462
17.12%
8
10.39%
fabian frederick
fabian frederick
376
13.94%
5
6.49%
al viro
al viro
195
7.23%
22
28.57%
yoshihisa abe
yoshihisa abe
92
3.41%
2
2.60%
david howells
david howells
34
1.26%
2
2.60%
miklos szeredi
miklos szeredi
33
1.22%
3
3.90%
nick piggin
nick piggin
26
0.96%
3
3.90%
linus torvalds
linus torvalds
8
0.30%
3
3.90%
dave hansen
dave hansen
6
0.22%
2
2.60%
deepa dinamani
deepa dinamani
4
0.15%
1
1.30%
tejun heo
tejun heo
3
0.11%
1
1.30%
trond myklebust
trond myklebust
2
0.07%
2
2.60%
harvey harrison
harvey harrison
2
0.07%
1
1.30%
dave jones
dave jones
1
0.04%
1
1.30%
adrian bunk
adrian bunk
1
0.04%
1
1.30%
Total
2698
100.00%
77
100.00%
Directory: fs/coda

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