From 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 Mon Sep 17 00:00:00 2001 From: Yunhong Jiang Date: Tue, 4 Aug 2015 12:17:53 -0700 Subject: Add the rt linux 4.1.3-rt3 as base Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang --- kernel/fs/coda/dir.c | 579 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 579 insertions(+) create mode 100644 kernel/fs/coda/dir.c (limited to 'kernel/fs/coda/dir.c') diff --git a/kernel/fs/coda/dir.c b/kernel/fs/coda/dir.c new file mode 100644 index 000000000..fda9f4311 --- /dev/null +++ b/kernel/fs/coda/dir.c @@ -0,0 +1,579 @@ + +/* + * 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#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; +} +#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); +} + + +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; +} + + +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_SEC; +#endif +} + +/* 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 */ +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; +} + +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; +} + +/* 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; +} + + +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; +} + +/* 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; +} + +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; +} + +/* rename */ +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; + int old_length = old_dentry->d_name.len; + int new_length = new_dentry->d_name.len; + int error; + + 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; +} + +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; +} + +/* 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; +} + +/* 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) { + struct inode *host_inode = file_inode(host_file); + + mutex_lock(&host_inode->i_mutex); + ret = -ENOENT; + if (!IS_DEADDIR(host_inode)) { + ret = host_file->f_op->iterate(host_file, ctx); + file_accessed(host_file); + } + mutex_unlock(&host_inode->i_mutex); + return ret; + } + /* Venus: we must read Venus dirents from a file */ + return coda_venus_readdir(coda_file, ctx); +} + +/* 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; +} + +/* + * 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; +} + + + +/* + * 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; +} + +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, +}; -- cgit 1.2.3-korg