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coda: fix nlink updates for directories

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The Coda client sets the directory link count to 1 when it isn't sure how many
subdirectories we have.  In this case we shouldn't change the link count in
the kernel when a subdirectory is created or removed.

Signed-off-by: Jan Harkes <jaharkes@cs.cmu.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jan Harkes 2007-07-19 01:48:43 -07:00 committed by Linus Torvalds
parent 56ee354794
commit d728900cd5
1 changed files with 60 additions and 46 deletions
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106
fs/coda/dir.c
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@ -173,12 +173,11 @@ int coda_permission(struct inode *inode, int mask, struct nameidata *nd)
out:
unlock_kernel();
return error;
return error;
}
static inline void coda_dir_changed(struct inode *dir, int link)
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
@ -186,12 +185,27 @@ static inline void coda_dir_changed(struct inode *dir, int link)
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. */
* 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_SEC;
#endif
if (link)
dir->i_nlink += link;
}
/* 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);
}
static inline void coda_dir_drop_nlink(struct inode *dir)
{
if (dir->i_nlink > 2)
drop_nlink(dir);
}
/* creation routines: create, mknod, mkdir, link, symlink */
@ -229,10 +243,10 @@ static int coda_create(struct inode *dir, struct dentry *de, int mode, struct na
}
/* invalidate the directory cnode's attributes */
coda_dir_changed(dir, 0);
coda_dir_update_mtime(dir);
unlock_kernel();
d_instantiate(de, inode);
return 0;
return 0;
}
static int coda_mkdir(struct inode *dir, struct dentry *de, int mode)
@ -268,12 +282,13 @@ static int coda_mkdir(struct inode *dir, struct dentry *de, int mode)
d_drop(de);
return PTR_ERR(inode);
}
/* invalidate the directory cnode's attributes */
coda_dir_changed(dir, 1);
coda_dir_inc_nlink(dir);
coda_dir_update_mtime(dir);
unlock_kernel();
d_instantiate(de, inode);
return 0;
return 0;
}
/* try to make de an entry in dir_inodde linked to source_de */
@ -296,16 +311,16 @@ static int coda_link(struct dentry *source_de, struct inode *dir_inode,
error = venus_link(dir_inode->i_sb, coda_i2f(inode),
coda_i2f(dir_inode), (const char *)name, len);
if (error) {
if (error) {
d_drop(de);
goto out;
}
coda_dir_changed(dir_inode, 0);
coda_dir_update_mtime(dir_inode);
atomic_inc(&inode->i_count);
d_instantiate(de, inode);
inc_nlink(inode);
out:
unlock_kernel();
return(error);
@ -336,18 +351,18 @@ static int coda_symlink(struct inode *dir_inode, struct dentry *de,
/*
* This entry is now negative. Since we do not create
* an inode for the entry we have to drop it.
* 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,
error = venus_symlink(dir_inode->i_sb, coda_i2f(dir_inode), name, len,
symname, symlen);
/* mtime is no good anymore */
if ( !error )
coda_dir_changed(dir_inode, 0);
coda_dir_update_mtime(dir_inode);
unlock_kernel();
return error;
return error;
}
/* destruction routines: unlink, rmdir */
@ -360,17 +375,16 @@ int coda_unlink(struct inode *dir, struct dentry *de)
lock_kernel();
coda_vfs_stat.unlink++;
error = venus_remove(dir->i_sb, coda_i2f(dir), name, len);
if ( error ) {
error = venus_remove(dir->i_sb, coda_i2f(dir), name, len);
if ( error ) {
unlock_kernel();
return error;
}
return error;
}
coda_dir_changed(dir, 0);
coda_dir_update_mtime(dir);
drop_nlink(de->d_inode);
unlock_kernel();
return 0;
return 0;
}
int coda_rmdir(struct inode *dir, struct dentry *de)
@ -388,49 +402,49 @@ int coda_rmdir(struct inode *dir, struct dentry *de)
}
error = venus_rmdir(dir->i_sb, coda_i2f(dir), name, len);
if ( error ) {
if ( error ) {
unlock_kernel();
return error;
}
return error;
}
coda_dir_changed(dir, -1);
coda_dir_drop_nlink(dir);
coda_dir_update_mtime(dir);
drop_nlink(de->d_inode);
d_delete(de);
unlock_kernel();
return 0;
return 0;
}
/* rename */
static int coda_rename(struct inode *old_dir, struct dentry *old_dentry,
static int coda_rename(struct inode *old_dir, struct dentry *old_dentry,
struct inode *new_dir, struct dentry *new_dentry)
{
const char *old_name = old_dentry->d_name.name;
const char *new_name = new_dentry->d_name.name;
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 link_adjust = 0;
int error;
int error;
lock_kernel();
coda_vfs_stat.rename++;
error = venus_rename(old_dir->i_sb, coda_i2f(old_dir),
coda_i2f(new_dir), old_length, new_length,
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 ( !error ) {
if ( new_dentry->d_inode ) {
if ( S_ISDIR(new_dentry->d_inode->i_mode) )
link_adjust = 1;
coda_dir_changed(old_dir, -link_adjust);
coda_dir_changed(new_dir, link_adjust);
if ( S_ISDIR(new_dentry->d_inode->i_mode) ) {
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(new_dentry->d_inode, C_VATTR);
} else {
coda_flag_inode(old_dir, C_VATTR);
coda_flag_inode(new_dir, C_VATTR);
}
}
}
unlock_kernel();