mirror of https://gitee.com/openkylin/linux.git
coda: fix nlink updates for directories
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
Linus Torvalds
parent
56ee354794
commit
d728900cd5
106
fs/coda/dir.c
106
fs/coda/dir.c
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@ -173,12 +173,11 @@ int coda_permission(struct inode *inode, int mask, struct nameidata *nd)
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out:
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unlock_kernel();
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return error;
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return error;
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}
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static inline void coda_dir_changed(struct inode *dir, int link)
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static inline void coda_dir_update_mtime(struct inode *dir)
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{
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#ifdef REQUERY_VENUS_FOR_MTIME
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/* invalidate the directory cnode's attributes so we refetch the
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@ -186,12 +185,27 @@ static inline void coda_dir_changed(struct inode *dir, int link)
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coda_flag_inode(dir, C_VATTR);
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#else
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/* optimistically we can also act as if our nose bleeds. The
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* granularity of the mtime is coarse anyways so we might actually be
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* right most of the time. Note: we only do this for directories. */
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* granularity of the mtime is coarse anyways so we might actually be
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* right most of the time. Note: we only do this for directories. */
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dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
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#endif
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if (link)
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dir->i_nlink += link;
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}
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/* we have to wrap inc_nlink/drop_nlink because sometimes userspace uses a
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* trick to fool GNU find's optimizations. If we can't be sure of the link
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* (because of volume mount points) we set i_nlink to 1 which forces find
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* to consider every child as a possible directory. We should also never
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* see an increment or decrement for deleted directories where i_nlink == 0 */
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static inline void coda_dir_inc_nlink(struct inode *dir)
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{
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if (dir->i_nlink >= 2)
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inc_nlink(dir);
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}
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static inline void coda_dir_drop_nlink(struct inode *dir)
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{
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if (dir->i_nlink > 2)
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drop_nlink(dir);
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}
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/* creation routines: create, mknod, mkdir, link, symlink */
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@ -229,10 +243,10 @@ static int coda_create(struct inode *dir, struct dentry *de, int mode, struct na
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}
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/* invalidate the directory cnode's attributes */
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coda_dir_changed(dir, 0);
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coda_dir_update_mtime(dir);
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unlock_kernel();
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d_instantiate(de, inode);
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return 0;
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return 0;
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}
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static int coda_mkdir(struct inode *dir, struct dentry *de, int mode)
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@ -268,12 +282,13 @@ static int coda_mkdir(struct inode *dir, struct dentry *de, int mode)
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d_drop(de);
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return PTR_ERR(inode);
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}
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/* invalidate the directory cnode's attributes */
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coda_dir_changed(dir, 1);
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coda_dir_inc_nlink(dir);
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coda_dir_update_mtime(dir);
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unlock_kernel();
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d_instantiate(de, inode);
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return 0;
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return 0;
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}
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/* try to make de an entry in dir_inodde linked to source_de */
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@ -296,16 +311,16 @@ static int coda_link(struct dentry *source_de, struct inode *dir_inode,
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error = venus_link(dir_inode->i_sb, coda_i2f(inode),
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coda_i2f(dir_inode), (const char *)name, len);
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if (error) {
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if (error) {
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d_drop(de);
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goto out;
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}
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coda_dir_changed(dir_inode, 0);
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coda_dir_update_mtime(dir_inode);
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atomic_inc(&inode->i_count);
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d_instantiate(de, inode);
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inc_nlink(inode);
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out:
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unlock_kernel();
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return(error);
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@ -336,18 +351,18 @@ static int coda_symlink(struct inode *dir_inode, struct dentry *de,
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/*
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* This entry is now negative. Since we do not create
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* an inode for the entry we have to drop it.
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* an inode for the entry we have to drop it.
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*/
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d_drop(de);
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error = venus_symlink(dir_inode->i_sb, coda_i2f(dir_inode), name, len,
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error = venus_symlink(dir_inode->i_sb, coda_i2f(dir_inode), name, len,
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symname, symlen);
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/* mtime is no good anymore */
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if ( !error )
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coda_dir_changed(dir_inode, 0);
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coda_dir_update_mtime(dir_inode);
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unlock_kernel();
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return error;
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return error;
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}
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/* destruction routines: unlink, rmdir */
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@ -360,17 +375,16 @@ int coda_unlink(struct inode *dir, struct dentry *de)
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lock_kernel();
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coda_vfs_stat.unlink++;
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error = venus_remove(dir->i_sb, coda_i2f(dir), name, len);
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if ( error ) {
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error = venus_remove(dir->i_sb, coda_i2f(dir), name, len);
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if ( error ) {
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unlock_kernel();
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return error;
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}
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return error;
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}
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coda_dir_changed(dir, 0);
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coda_dir_update_mtime(dir);
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drop_nlink(de->d_inode);
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unlock_kernel();
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return 0;
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return 0;
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}
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int coda_rmdir(struct inode *dir, struct dentry *de)
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@ -388,49 +402,49 @@ int coda_rmdir(struct inode *dir, struct dentry *de)
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}
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error = venus_rmdir(dir->i_sb, coda_i2f(dir), name, len);
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if ( error ) {
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if ( error ) {
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unlock_kernel();
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return error;
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}
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return error;
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}
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coda_dir_changed(dir, -1);
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coda_dir_drop_nlink(dir);
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coda_dir_update_mtime(dir);
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drop_nlink(de->d_inode);
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d_delete(de);
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unlock_kernel();
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return 0;
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return 0;
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}
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/* rename */
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static int coda_rename(struct inode *old_dir, struct dentry *old_dentry,
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static int coda_rename(struct inode *old_dir, struct dentry *old_dentry,
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struct inode *new_dir, struct dentry *new_dentry)
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{
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const char *old_name = old_dentry->d_name.name;
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const char *new_name = new_dentry->d_name.name;
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const char *old_name = old_dentry->d_name.name;
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const char *new_name = new_dentry->d_name.name;
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int old_length = old_dentry->d_name.len;
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int new_length = new_dentry->d_name.len;
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int link_adjust = 0;
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int error;
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int error;
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lock_kernel();
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coda_vfs_stat.rename++;
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error = venus_rename(old_dir->i_sb, coda_i2f(old_dir),
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coda_i2f(new_dir), old_length, new_length,
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error = venus_rename(old_dir->i_sb, coda_i2f(old_dir),
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coda_i2f(new_dir), old_length, new_length,
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(const char *) old_name, (const char *)new_name);
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if ( !error ) {
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if ( !error ) {
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if ( new_dentry->d_inode ) {
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if ( S_ISDIR(new_dentry->d_inode->i_mode) )
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link_adjust = 1;
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coda_dir_changed(old_dir, -link_adjust);
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coda_dir_changed(new_dir, link_adjust);
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if ( S_ISDIR(new_dentry->d_inode->i_mode) ) {
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coda_dir_drop_nlink(old_dir);
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coda_dir_inc_nlink(new_dir);
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}
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coda_dir_update_mtime(old_dir);
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coda_dir_update_mtime(new_dir);
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coda_flag_inode(new_dentry->d_inode, C_VATTR);
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} else {
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coda_flag_inode(old_dir, C_VATTR);
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coda_flag_inode(new_dir, C_VATTR);
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}
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}
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}
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unlock_kernel();
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