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fs/reiserfs/xattr.c
25.8 KB
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/* * linux/fs/reiserfs/xattr.c * * Copyright (c) 2002 by Jeff Mahoney, <jeffm@suse.com> * */ /* * In order to implement EA/ACLs in a clean, backwards compatible manner, * they are implemented as files in a "private" directory. * Each EA is in it's own file, with the directory layout like so (/ is assumed * to be relative to fs root). Inside the /.reiserfs_priv/xattrs directory, * directories named using the capital-hex form of the objectid and * generation number are used. Inside each directory are individual files * named with the name of the extended attribute. * * So, for objectid 12648430, we could have: * /.reiserfs_priv/xattrs/C0FFEE.0/system.posix_acl_access * /.reiserfs_priv/xattrs/C0FFEE.0/system.posix_acl_default * /.reiserfs_priv/xattrs/C0FFEE.0/user.Content-Type * .. or similar. * * The file contents are the text of the EA. The size is known based on the * stat data describing the file. * * In the case of system.posix_acl_access and system.posix_acl_default, since * these are special cases for filesystem ACLs, they are interpreted by the * kernel, in addition, they are negatively and positively cached and attached * to the inode so that unnecessary lookups are avoided. |
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* * Locking works like so: |
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* Directory components (xattr root, xattr dir) are protectd by their i_mutex. * The xattrs themselves are protected by the xattr_sem. |
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*/ #include <linux/reiserfs_fs.h> |
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#include <linux/capability.h> |
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#include <linux/dcache.h> #include <linux/namei.h> #include <linux/errno.h> |
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#include <linux/gfp.h> |
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#include <linux/fs.h> #include <linux/file.h> #include <linux/pagemap.h> #include <linux/xattr.h> #include <linux/reiserfs_xattr.h> #include <linux/reiserfs_acl.h> |
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#include <asm/uaccess.h> |
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#include <net/checksum.h> |
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#include <linux/stat.h> |
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#include <linux/quotaops.h> |
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#include <linux/security.h> |
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#define PRIVROOT_NAME ".reiserfs_priv" #define XAROOT_NAME "xattrs" |
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/* Helpers for inode ops. We do this so that we don't have all the VFS * overhead and also for proper i_mutex annotation. * dir->i_mutex must be held for all of them. */ |
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#ifdef CONFIG_REISERFS_FS_XATTR |
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static int xattr_create(struct inode *dir, struct dentry *dentry, int mode) |
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{ |
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BUG_ON(!mutex_is_locked(&dir->i_mutex)); |
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return dir->i_op->create(dir, dentry, mode, NULL); } |
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#endif |
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static int xattr_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
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{ BUG_ON(!mutex_is_locked(&dir->i_mutex)); |
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return dir->i_op->mkdir(dir, dentry, mode); } |
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/* We use I_MUTEX_CHILD here to silence lockdep. It's safe because xattr * mutation ops aren't called during rename or splace, which are the * only other users of I_MUTEX_CHILD. It violates the ordering, but that's * better than allocating another subclass just for this code. */ static int xattr_unlink(struct inode *dir, struct dentry *dentry) { int error; BUG_ON(!mutex_is_locked(&dir->i_mutex)); |
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reiserfs_mutex_lock_nested_safe(&dentry->d_inode->i_mutex, I_MUTEX_CHILD, dir->i_sb); |
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error = dir->i_op->unlink(dir, dentry); mutex_unlock(&dentry->d_inode->i_mutex); if (!error) d_delete(dentry); return error; } static int xattr_rmdir(struct inode *dir, struct dentry *dentry) { int error; BUG_ON(!mutex_is_locked(&dir->i_mutex)); |
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reiserfs_mutex_lock_nested_safe(&dentry->d_inode->i_mutex, I_MUTEX_CHILD, dir->i_sb); |
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error = dir->i_op->rmdir(dir, dentry); if (!error) dentry->d_inode->i_flags |= S_DEAD; mutex_unlock(&dentry->d_inode->i_mutex); if (!error) d_delete(dentry); |
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return error; } |
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#define xattr_may_create(flags) (!flags || flags & XATTR_CREATE) |
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static struct dentry *open_xa_root(struct super_block *sb, int flags) |
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{ |
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struct dentry *privroot = REISERFS_SB(sb)->priv_root; struct dentry *xaroot; if (!privroot->d_inode) return ERR_PTR(-ENODATA); |
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mutex_lock_nested(&privroot->d_inode->i_mutex, I_MUTEX_XATTR); |
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xaroot = dget(REISERFS_SB(sb)->xattr_root); |
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if (!xaroot) xaroot = ERR_PTR(-ENODATA); else if (!xaroot->d_inode) { |
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int err = -ENODATA; |
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if (xattr_may_create(flags)) |
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err = xattr_mkdir(privroot->d_inode, xaroot, 0700); |
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if (err) { |
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dput(xaroot); xaroot = ERR_PTR(err); |
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} |
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} |
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mutex_unlock(&privroot->d_inode->i_mutex); return xaroot; |
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} |
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static struct dentry *open_xa_dir(const struct inode *inode, int flags) |
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{ |
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struct dentry *xaroot, *xadir; char namebuf[17]; |
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xaroot = open_xa_root(inode->i_sb, flags); |
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if (IS_ERR(xaroot)) |
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return xaroot; |
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snprintf(namebuf, sizeof(namebuf), "%X.%X", le32_to_cpu(INODE_PKEY(inode)->k_objectid), inode->i_generation); |
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mutex_lock_nested(&xaroot->d_inode->i_mutex, I_MUTEX_XATTR); xadir = lookup_one_len(namebuf, xaroot, strlen(namebuf)); if (!IS_ERR(xadir) && !xadir->d_inode) { int err = -ENODATA; if (xattr_may_create(flags)) err = xattr_mkdir(xaroot->d_inode, xadir, 0700); if (err) { dput(xadir); xadir = ERR_PTR(err); } } mutex_unlock(&xaroot->d_inode->i_mutex); |
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dput(xaroot); return xadir; |
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} |
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/* The following are side effects of other operations that aren't explicitly * modifying extended attributes. This includes operations such as permissions * or ownership changes, object deletions, etc. */ |
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struct reiserfs_dentry_buf { struct dentry *xadir; int count; struct dentry *dentries[8]; }; |
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static int |
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fill_with_dentries(void *buf, const char *name, int namelen, loff_t offset, u64 ino, unsigned int d_type) |
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{ |
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struct reiserfs_dentry_buf *dbuf = buf; |
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struct dentry *dentry; |
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WARN_ON_ONCE(!mutex_is_locked(&dbuf->xadir->d_inode->i_mutex)); |
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if (dbuf->count == ARRAY_SIZE(dbuf->dentries)) return -ENOSPC; |
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if (name[0] == '.' && (name[1] == '\0' || (name[1] == '.' && name[2] == '\0'))) return 0; |
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dentry = lookup_one_len(name, dbuf->xadir, namelen); |
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if (IS_ERR(dentry)) { |
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return PTR_ERR(dentry); |
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} else if (!dentry->d_inode) { |
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/* A directory entry exists, but no file? */ reiserfs_error(dentry->d_sb, "xattr-20003", "Corrupted directory: xattr %s listed but " "not found for file %s. ", dentry->d_name.name, dbuf->xadir->d_name.name); dput(dentry); return -EIO; |
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} |
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dbuf->dentries[dbuf->count++] = dentry; return 0; |
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} |
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static void cleanup_dentry_buf(struct reiserfs_dentry_buf *buf) |
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{ |
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int i; for (i = 0; i < buf->count; i++) if (buf->dentries[i]) dput(buf->dentries[i]); |
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} |
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static int reiserfs_for_each_xattr(struct inode *inode, int (*action)(struct dentry *, void *), void *data) |
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{ |
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struct dentry *dir; int i, err = 0; loff_t pos = 0; struct reiserfs_dentry_buf buf = { .count = 0, }; |
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/* Skip out, an xattr has no xattrs associated with it */ if (IS_PRIVATE(inode) || get_inode_sd_version(inode) == STAT_DATA_V1) return 0; |
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reiserfs_write_unlock(inode->i_sb); |
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dir = open_xa_dir(inode, XATTR_REPLACE); |
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if (IS_ERR(dir)) { err = PTR_ERR(dir); |
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reiserfs_write_lock(inode->i_sb); |
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goto out; } else if (!dir->d_inode) { |
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err = 0; |
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reiserfs_write_lock(inode->i_sb); |
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goto out_dir; |
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} |
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mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_XATTR); |
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reiserfs_write_lock(inode->i_sb); |
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buf.xadir = dir; err = reiserfs_readdir_dentry(dir, &buf, fill_with_dentries, &pos); while ((err == 0 || err == -ENOSPC) && buf.count) { err = 0; |
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for (i = 0; i < buf.count && buf.dentries[i]; i++) { int lerr = 0; struct dentry *dentry = buf.dentries[i]; |
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if (err == 0 && !S_ISDIR(dentry->d_inode->i_mode)) lerr = action(dentry, data); |
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dput(dentry); buf.dentries[i] = NULL; err = lerr ?: err; |
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} |
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buf.count = 0; if (!err) err = reiserfs_readdir_dentry(dir, &buf, fill_with_dentries, &pos); |
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} |
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mutex_unlock(&dir->d_inode->i_mutex); |
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/* Clean up after a failed readdir */ cleanup_dentry_buf(&buf); |
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if (!err) { |
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/* We start a transaction here to avoid a ABBA situation * between the xattr root's i_mutex and the journal lock. * This doesn't incur much additional overhead since the * new transaction will just nest inside the * outer transaction. */ int blocks = JOURNAL_PER_BALANCE_CNT * 2 + 2 + 4 * REISERFS_QUOTA_TRANS_BLOCKS(inode->i_sb); struct reiserfs_transaction_handle th; err = journal_begin(&th, inode->i_sb, blocks); if (!err) { int jerror; |
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reiserfs_mutex_lock_nested_safe( &dir->d_parent->d_inode->i_mutex, I_MUTEX_XATTR, inode->i_sb); |
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err = action(dir, data); jerror = journal_end(&th, inode->i_sb, blocks); mutex_unlock(&dir->d_parent->d_inode->i_mutex); err = jerror ?: err; } |
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} |
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out_dir: dput(dir); |
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out: |
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/* -ENODATA isn't an error */ if (err == -ENODATA) err = 0; |
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return err; } |
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static int delete_one_xattr(struct dentry *dentry, void *data) |
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{ |
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struct inode *dir = dentry->d_parent->d_inode; |
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/* This is the xattr dir, handle specially. */ if (S_ISDIR(dentry->d_inode->i_mode)) return xattr_rmdir(dir, dentry); |
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return xattr_unlink(dir, dentry); } |
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static int chown_one_xattr(struct dentry *dentry, void *data) { struct iattr *attrs = data; return reiserfs_setattr(dentry, attrs); } |
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/* No i_mutex, but the inode is unconnected. */ int reiserfs_delete_xattrs(struct inode *inode) { int err = reiserfs_for_each_xattr(inode, delete_one_xattr, NULL); if (err) reiserfs_warning(inode->i_sb, "jdm-20004", "Couldn't delete all xattrs (%d) ", err); |
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return err; } |
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/* inode->i_mutex: down */ |
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int reiserfs_chown_xattrs(struct inode *inode, struct iattr *attrs) { |
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int err = reiserfs_for_each_xattr(inode, chown_one_xattr, attrs); |
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if (err) reiserfs_warning(inode->i_sb, "jdm-20007", "Couldn't chown all xattrs (%d) ", err); |
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return err; |
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} |
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#ifdef CONFIG_REISERFS_FS_XATTR |
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/* Returns a dentry corresponding to a specific extended attribute file * for the inode. If flags allow, the file is created. Otherwise, a * valid or negative dentry, or an error is returned. */ |
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static struct dentry *xattr_lookup(struct inode *inode, const char *name, int flags) |
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{ |
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struct dentry *xadir, *xafile; int err = 0; xadir = open_xa_dir(inode, flags); |
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if (IS_ERR(xadir)) |
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return ERR_CAST(xadir); |
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mutex_lock_nested(&xadir->d_inode->i_mutex, I_MUTEX_XATTR); |
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xafile = lookup_one_len(name, xadir, strlen(name)); if (IS_ERR(xafile)) { |
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err = PTR_ERR(xafile); goto out; |
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} |
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if (xafile->d_inode && (flags & XATTR_CREATE)) err = -EEXIST; |
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if (!xafile->d_inode) { err = -ENODATA; |
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if (xattr_may_create(flags)) |
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err = xattr_create(xadir->d_inode, xafile, 0700|S_IFREG); |
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} |
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if (err) dput(xafile); |
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out: |
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mutex_unlock(&xadir->d_inode->i_mutex); |
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dput(xadir); if (err) |
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return ERR_PTR(err); |
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return xafile; |
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} |
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/* Internal operations on file data */ |
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static inline void reiserfs_put_page(struct page *page) |
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{ |
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kunmap(page); page_cache_release(page); |
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} |
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static struct page *reiserfs_get_page(struct inode *dir, size_t n) |
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{ |
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struct address_space *mapping = dir->i_mapping; struct page *page; /* We can deadlock if we try to free dentries, |
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and an unlink/rmdir has just occurred - GFP_NOFS avoids this */ |
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mapping_set_gfp_mask(mapping, GFP_NOFS); |
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page = read_mapping_page(mapping, n >> PAGE_CACHE_SHIFT, NULL); |
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if (!IS_ERR(page)) { |
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kmap(page); |
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if (PageError(page)) goto fail; } return page; fail: reiserfs_put_page(page); return ERR_PTR(-EIO); |
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} |
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static inline __u32 xattr_hash(const char *msg, int len) |
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{ |
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return csum_partial(msg, len, 0); |
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} |
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int reiserfs_commit_write(struct file *f, struct page *page, unsigned from, unsigned to); |
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static void update_ctime(struct inode *inode) { struct timespec now = current_fs_time(inode->i_sb); |
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if (inode_unhashed(inode) || !inode->i_nlink || |
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timespec_equal(&inode->i_ctime, &now)) return; inode->i_ctime = CURRENT_TIME_SEC; mark_inode_dirty(inode); } static int lookup_and_delete_xattr(struct inode *inode, const char *name) { int err = 0; struct dentry *dentry, *xadir; xadir = open_xa_dir(inode, XATTR_REPLACE); if (IS_ERR(xadir)) return PTR_ERR(xadir); |
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mutex_lock_nested(&xadir->d_inode->i_mutex, I_MUTEX_XATTR); |
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dentry = lookup_one_len(name, xadir, strlen(name)); if (IS_ERR(dentry)) { err = PTR_ERR(dentry); goto out_dput; } if (dentry->d_inode) { |
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reiserfs_write_lock(inode->i_sb); |
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err = xattr_unlink(xadir->d_inode, dentry); |
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reiserfs_write_unlock(inode->i_sb); |
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update_ctime(inode); } dput(dentry); out_dput: |
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mutex_unlock(&xadir->d_inode->i_mutex); |
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444 445 446 |
dput(xadir); return err; } |
ba9d8cec6
|
447 |
|
1da177e4c
|
448 449 450 |
/* Generic extended attribute operations that can be used by xa plugins */ /* |
1b1dcc1b5
|
451 |
* inode->i_mutex: down |
1da177e4c
|
452 453 |
*/ int |
0ab2621eb
|
454 455 456 |
reiserfs_xattr_set_handle(struct reiserfs_transaction_handle *th, struct inode *inode, const char *name, const void *buffer, size_t buffer_size, int flags) |
1da177e4c
|
457 |
{ |
bd4c625c0
|
458 |
int err = 0; |
3227e14c3
|
459 |
struct dentry *dentry; |
bd4c625c0
|
460 461 |
struct page *page; char *data; |
bd4c625c0
|
462 463 |
size_t file_pos = 0; size_t buffer_pos = 0; |
48b32a355
|
464 |
size_t new_size; |
bd4c625c0
|
465 |
__u32 xahash = 0; |
bd4c625c0
|
466 467 |
if (get_inode_sd_version(inode) == STAT_DATA_V1) return -EOPNOTSUPP; |
3f14fea6b
|
468 |
reiserfs_write_unlock(inode->i_sb); |
4f3be1b5a
|
469 470 471 472 473 474 |
if (!buffer) { err = lookup_and_delete_xattr(inode, name); reiserfs_write_lock(inode->i_sb); return err; } |
48b32a355
|
475 |
dentry = xattr_lookup(inode, name, flags); |
3f14fea6b
|
476 477 |
if (IS_ERR(dentry)) { reiserfs_write_lock(inode->i_sb); |
48b32a355
|
478 |
return PTR_ERR(dentry); |
3f14fea6b
|
479 |
} |
f3e22f48f
|
480 |
down_write(&REISERFS_I(inode)->i_xattr_sem); |
bd4c625c0
|
481 |
|
3f14fea6b
|
482 |
reiserfs_write_lock(inode->i_sb); |
bd4c625c0
|
483 |
|
8b6dd72a4
|
484 |
xahash = xattr_hash(buffer, buffer_size); |
bd4c625c0
|
485 486 487 488 489 490 491 492 |
while (buffer_pos < buffer_size || buffer_pos == 0) { size_t chunk; size_t skip = 0; size_t page_offset = (file_pos & (PAGE_CACHE_SIZE - 1)); if (buffer_size - buffer_pos > PAGE_CACHE_SIZE) chunk = PAGE_CACHE_SIZE; else chunk = buffer_size - buffer_pos; |
ec6ea56b2
|
493 |
page = reiserfs_get_page(dentry->d_inode, file_pos); |
bd4c625c0
|
494 495 |
if (IS_ERR(page)) { err = PTR_ERR(page); |
48b32a355
|
496 |
goto out_unlock; |
bd4c625c0
|
497 498 499 500 501 502 503 504 505 506 507 508 509 510 |
} lock_page(page); data = page_address(page); if (file_pos == 0) { struct reiserfs_xattr_header *rxh; skip = file_pos = sizeof(struct reiserfs_xattr_header); if (chunk + skip > PAGE_CACHE_SIZE) chunk = PAGE_CACHE_SIZE - skip; rxh = (struct reiserfs_xattr_header *)data; rxh->h_magic = cpu_to_le32(REISERFS_XATTR_MAGIC); rxh->h_hash = cpu_to_le32(xahash); } |
ebdec241d
|
511 |
err = __reiserfs_write_begin(page, page_offset, chunk + skip); |
bd4c625c0
|
512 513 514 |
if (!err) { if (buffer) memcpy(data + skip, buffer + buffer_pos, chunk); |
3227e14c3
|
515 516 517 |
err = reiserfs_commit_write(NULL, page, page_offset, page_offset + chunk + skip); |
bd4c625c0
|
518 519 520 521 522 523 524 525 526 |
} unlock_page(page); reiserfs_put_page(page); buffer_pos += chunk; file_pos += chunk; skip = 0; if (err || buffer_size == 0 || !buffer) break; } |
48b32a355
|
527 528 529 530 |
new_size = buffer_size + sizeof(struct reiserfs_xattr_header); if (!err && new_size < i_size_read(dentry->d_inode)) { struct iattr newattrs = { .ia_ctime = current_fs_time(inode->i_sb), |
fb2162df7
|
531 |
.ia_size = new_size, |
48b32a355
|
532 533 |
.ia_valid = ATTR_SIZE | ATTR_CTIME, }; |
31370f62b
|
534 535 |
reiserfs_write_unlock(inode->i_sb); |
48b32a355
|
536 |
mutex_lock_nested(&dentry->d_inode->i_mutex, I_MUTEX_XATTR); |
bd5fe6c5e
|
537 |
inode_dio_wait(dentry->d_inode); |
31370f62b
|
538 |
reiserfs_write_lock(inode->i_sb); |
48b32a355
|
539 |
err = reiserfs_setattr(dentry, &newattrs); |
48b32a355
|
540 541 542 543 |
mutex_unlock(&dentry->d_inode->i_mutex); } else update_ctime(inode); out_unlock: |
8b6dd72a4
|
544 |
up_write(&REISERFS_I(inode)->i_xattr_sem); |
3227e14c3
|
545 |
dput(dentry); |
48b32a355
|
546 547 |
return err; } |
bd4c625c0
|
548 |
|
0ab2621eb
|
549 550 551 |
/* We need to start a transaction to maintain lock ordering */ int reiserfs_xattr_set(struct inode *inode, const char *name, const void *buffer, size_t buffer_size, int flags) |
48b32a355
|
552 |
{ |
0ab2621eb
|
553 554 555 556 557 558 559 560 561 562 563 564 565 |
struct reiserfs_transaction_handle th; int error, error2; size_t jbegin_count = reiserfs_xattr_nblocks(inode, buffer_size); if (!(flags & XATTR_REPLACE)) jbegin_count += reiserfs_xattr_jcreate_nblocks(inode); reiserfs_write_lock(inode->i_sb); error = journal_begin(&th, inode->i_sb, jbegin_count); if (error) { reiserfs_write_unlock(inode->i_sb); return error; |
1da177e4c
|
566 |
} |
bd4c625c0
|
567 |
|
0ab2621eb
|
568 569 |
error = reiserfs_xattr_set_handle(&th, inode, name, buffer, buffer_size, flags); |
bd4c625c0
|
570 |
|
0ab2621eb
|
571 572 573 574 575 576 |
error2 = journal_end(&th, inode->i_sb, jbegin_count); if (error == 0) error = error2; reiserfs_write_unlock(inode->i_sb); return error; |
1da177e4c
|
577 578 579 |
} /* |
1b1dcc1b5
|
580 |
* inode->i_mutex: down |
1da177e4c
|
581 582 |
*/ int |
48b32a355
|
583 |
reiserfs_xattr_get(struct inode *inode, const char *name, void *buffer, |
bd4c625c0
|
584 |
size_t buffer_size) |
1da177e4c
|
585 |
{ |
bd4c625c0
|
586 |
ssize_t err = 0; |
3227e14c3
|
587 |
struct dentry *dentry; |
bd4c625c0
|
588 589 590 591 |
size_t isize; size_t file_pos = 0; size_t buffer_pos = 0; struct page *page; |
bd4c625c0
|
592 593 594 595 596 597 598 599 600 |
__u32 hash = 0; if (name == NULL) return -EINVAL; /* We can't have xattrs attached to v1 items since they don't have * generation numbers */ if (get_inode_sd_version(inode) == STAT_DATA_V1) return -EOPNOTSUPP; |
48b32a355
|
601 |
dentry = xattr_lookup(inode, name, XATTR_REPLACE); |
3227e14c3
|
602 603 |
if (IS_ERR(dentry)) { err = PTR_ERR(dentry); |
bd4c625c0
|
604 605 |
goto out; } |
8b6dd72a4
|
606 |
down_read(&REISERFS_I(inode)->i_xattr_sem); |
d984561b3
|
607 |
|
f437c529e
|
608 |
isize = i_size_read(dentry->d_inode); |
bd4c625c0
|
609 610 611 612 |
/* Just return the size needed */ if (buffer == NULL) { err = isize - sizeof(struct reiserfs_xattr_header); |
8b6dd72a4
|
613 |
goto out_unlock; |
bd4c625c0
|
614 615 616 617 |
} if (buffer_size < isize - sizeof(struct reiserfs_xattr_header)) { err = -ERANGE; |
8b6dd72a4
|
618 |
goto out_unlock; |
bd4c625c0
|
619 620 621 622 623 624 625 626 627 628 |
} while (file_pos < isize) { size_t chunk; char *data; size_t skip = 0; if (isize - file_pos > PAGE_CACHE_SIZE) chunk = PAGE_CACHE_SIZE; else chunk = isize - file_pos; |
a72bdb1cd
|
629 |
page = reiserfs_get_page(dentry->d_inode, file_pos); |
bd4c625c0
|
630 631 |
if (IS_ERR(page)) { err = PTR_ERR(page); |
8b6dd72a4
|
632 |
goto out_unlock; |
bd4c625c0
|
633 634 635 636 637 638 639 640 641 642 643 644 645 |
} lock_page(page); data = page_address(page); if (file_pos == 0) { struct reiserfs_xattr_header *rxh = (struct reiserfs_xattr_header *)data; skip = file_pos = sizeof(struct reiserfs_xattr_header); chunk -= skip; /* Magic doesn't match up.. */ if (rxh->h_magic != cpu_to_le32(REISERFS_XATTR_MAGIC)) { unlock_page(page); reiserfs_put_page(page); |
a72bdb1cd
|
646 |
reiserfs_warning(inode->i_sb, "jdm-20001", |
bd4c625c0
|
647 648 649 650 |
"Invalid magic for xattr (%s) " "associated with %k", name, INODE_PKEY(inode)); err = -EIO; |
8b6dd72a4
|
651 |
goto out_unlock; |
bd4c625c0
|
652 653 654 655 656 657 658 659 660 661 662 663 664 665 |
} hash = le32_to_cpu(rxh->h_hash); } memcpy(buffer + buffer_pos, data + skip, chunk); unlock_page(page); reiserfs_put_page(page); file_pos += chunk; buffer_pos += chunk; skip = 0; } err = isize - sizeof(struct reiserfs_xattr_header); if (xattr_hash(buffer, isize - sizeof(struct reiserfs_xattr_header)) != hash) { |
a72bdb1cd
|
666 |
reiserfs_warning(inode->i_sb, "jdm-20002", |
bd4c625c0
|
667 668 669 670 |
"Invalid hash for xattr (%s) associated " "with %k", name, INODE_PKEY(inode)); err = -EIO; } |
8b6dd72a4
|
671 672 |
out_unlock: up_read(&REISERFS_I(inode)->i_xattr_sem); |
3227e14c3
|
673 |
dput(dentry); |
bd4c625c0
|
674 |
|
a72bdb1cd
|
675 |
out: |
bd4c625c0
|
676 |
return err; |
1da177e4c
|
677 |
} |
48b32a355
|
678 679 680 681 682 683 684 685 686 687 688 689 690 |
/* * In order to implement different sets of xattr operations for each xattr * prefix with the generic xattr API, a filesystem should create a * null-terminated array of struct xattr_handler (one for each prefix) and * hang a pointer to it off of the s_xattr field of the superblock. * * The generic_fooxattr() functions will use this list to dispatch xattr * operations to the correct xattr_handler. */ #define for_each_xattr_handler(handlers, handler) \ for ((handler) = *(handlers)++; \ (handler) != NULL; \ (handler) = *(handlers)++) |
1da177e4c
|
691 |
|
48b32a355
|
692 |
/* This is the implementation for the xattr plugin infrastructure */ |
94d09a98c
|
693 694 |
static inline const struct xattr_handler * find_xattr_handler_prefix(const struct xattr_handler **handlers, |
48b32a355
|
695 |
const char *name) |
1da177e4c
|
696 |
{ |
94d09a98c
|
697 |
const struct xattr_handler *xah; |
bd4c625c0
|
698 |
|
48b32a355
|
699 700 |
if (!handlers) return NULL; |
bd4c625c0
|
701 |
|
48b32a355
|
702 703 704 |
for_each_xattr_handler(handlers, xah) { if (strncmp(xah->prefix, name, strlen(xah->prefix)) == 0) break; |
bd4c625c0
|
705 |
} |
48b32a355
|
706 |
return xah; |
bd4c625c0
|
707 |
} |
1da177e4c
|
708 |
|
1da177e4c
|
709 710 711 |
/* * Inode operation getxattr() |
1da177e4c
|
712 713 |
*/ ssize_t |
bd4c625c0
|
714 715 |
reiserfs_getxattr(struct dentry * dentry, const char *name, void *buffer, size_t size) |
1da177e4c
|
716 |
{ |
94d09a98c
|
717 |
const struct xattr_handler *handler; |
bd4c625c0
|
718 |
|
431547b3c
|
719 |
handler = find_xattr_handler_prefix(dentry->d_sb->s_xattr, name); |
48b32a355
|
720 |
|
431547b3c
|
721 |
if (!handler || get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1) |
bd4c625c0
|
722 |
return -EOPNOTSUPP; |
431547b3c
|
723 |
return handler->get(dentry, name, buffer, size, handler->flags); |
1da177e4c
|
724 |
} |
1da177e4c
|
725 726 727 |
/* * Inode operation setxattr() * |
1b1dcc1b5
|
728 |
* dentry->d_inode->i_mutex down |
1da177e4c
|
729 730 |
*/ int |
bd4c625c0
|
731 732 |
reiserfs_setxattr(struct dentry *dentry, const char *name, const void *value, size_t size, int flags) |
1da177e4c
|
733 |
{ |
94d09a98c
|
734 |
const struct xattr_handler *handler; |
bd4c625c0
|
735 |
|
431547b3c
|
736 |
handler = find_xattr_handler_prefix(dentry->d_sb->s_xattr, name); |
48b32a355
|
737 |
|
431547b3c
|
738 |
if (!handler || get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1) |
bd4c625c0
|
739 |
return -EOPNOTSUPP; |
431547b3c
|
740 |
return handler->set(dentry, name, value, size, flags, handler->flags); |
1da177e4c
|
741 742 743 744 745 |
} /* * Inode operation removexattr() * |
1b1dcc1b5
|
746 |
* dentry->d_inode->i_mutex down |
1da177e4c
|
747 |
*/ |
bd4c625c0
|
748 |
int reiserfs_removexattr(struct dentry *dentry, const char *name) |
1da177e4c
|
749 |
{ |
94d09a98c
|
750 |
const struct xattr_handler *handler; |
431547b3c
|
751 |
handler = find_xattr_handler_prefix(dentry->d_sb->s_xattr, name); |
1da177e4c
|
752 |
|
431547b3c
|
753 |
if (!handler || get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1) |
bd4c625c0
|
754 |
return -EOPNOTSUPP; |
1da177e4c
|
755 |
|
431547b3c
|
756 |
return handler->set(dentry, name, NULL, 0, XATTR_REPLACE, handler->flags); |
1da177e4c
|
757 |
} |
48b32a355
|
758 759 760 761 |
struct listxattr_buf { size_t size; size_t pos; char *buf; |
431547b3c
|
762 |
struct dentry *dentry; |
1da177e4c
|
763 |
}; |
48b32a355
|
764 765 |
static int listxattr_filler(void *buf, const char *name, int namelen, loff_t offset, u64 ino, unsigned int d_type) |
1da177e4c
|
766 |
{ |
48b32a355
|
767 768 769 770 |
struct listxattr_buf *b = (struct listxattr_buf *)buf; size_t size; if (name[0] != '.' || (namelen != 1 && (name[1] != '.' || namelen != 2))) { |
94d09a98c
|
771 |
const struct xattr_handler *handler; |
431547b3c
|
772 |
handler = find_xattr_handler_prefix(b->dentry->d_sb->s_xattr, |
48b32a355
|
773 774 775 776 |
name); if (!handler) /* Unsupported xattr name */ return 0; if (b->buf) { |
431547b3c
|
777 778 779 |
size = handler->list(b->dentry, b->buf + b->pos, b->size, name, namelen, handler->flags); |
48b32a355
|
780 781 782 |
if (size > b->size) return -ERANGE; } else { |
431547b3c
|
783 784 |
size = handler->list(b->dentry, NULL, 0, name, namelen, handler->flags); |
bd4c625c0
|
785 |
} |
bd4c625c0
|
786 |
|
48b32a355
|
787 788 |
b->pos += size; } |
bd4c625c0
|
789 |
return 0; |
1da177e4c
|
790 |
} |
bd4c625c0
|
791 |
|
1da177e4c
|
792 793 794 |
/* * Inode operation listxattr() * |
48b32a355
|
795 796 797 |
* We totally ignore the generic listxattr here because it would be stupid * not to. Since the xattrs are organized in a directory, we can just * readdir to find them. |
1da177e4c
|
798 |
*/ |
bd4c625c0
|
799 |
ssize_t reiserfs_listxattr(struct dentry * dentry, char *buffer, size_t size) |
1da177e4c
|
800 |
{ |
bd4c625c0
|
801 802 |
struct dentry *dir; int err = 0; |
a41f1a471
|
803 |
loff_t pos = 0; |
48b32a355
|
804 |
struct listxattr_buf buf = { |
431547b3c
|
805 |
.dentry = dentry, |
48b32a355
|
806 807 808 |
.buf = buffer, .size = buffer ? size : 0, }; |
bd4c625c0
|
809 810 811 |
if (!dentry->d_inode) return -EINVAL; |
677c9b2e3
|
812 |
if (!dentry->d_sb->s_xattr || |
bd4c625c0
|
813 814 |
get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1) return -EOPNOTSUPP; |
6c17675e1
|
815 |
dir = open_xa_dir(dentry->d_inode, XATTR_REPLACE); |
bd4c625c0
|
816 817 818 |
if (IS_ERR(dir)) { err = PTR_ERR(dir); if (err == -ENODATA) |
48b32a355
|
819 |
err = 0; /* Not an error if there aren't any xattrs */ |
bd4c625c0
|
820 821 |
goto out; } |
6c17675e1
|
822 |
mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_XATTR); |
a41f1a471
|
823 |
err = reiserfs_readdir_dentry(dir, &buf, listxattr_filler, &pos); |
6c17675e1
|
824 |
mutex_unlock(&dir->d_inode->i_mutex); |
bd4c625c0
|
825 |
|
48b32a355
|
826 827 |
if (!err) err = buf.pos; |
bd4c625c0
|
828 |
|
3227e14c3
|
829 |
dput(dir); |
8b6dd72a4
|
830 |
out: |
bd4c625c0
|
831 |
return err; |
1da177e4c
|
832 |
} |
a72bdb1cd
|
833 |
static int create_privroot(struct dentry *dentry) |
1da177e4c
|
834 |
{ |
a72bdb1cd
|
835 836 |
int err; struct inode *inode = dentry->d_parent->d_inode; |
5a6059c35
|
837 |
WARN_ON_ONCE(!mutex_is_locked(&inode->i_mutex)); |
6c17675e1
|
838 |
err = xattr_mkdir(inode, dentry, 0700); |
edcc37a04
|
839 840 841 842 843 844 |
if (err || !dentry->d_inode) { reiserfs_warning(dentry->d_sb, "jdm-20006", "xattrs/ACLs enabled and couldn't " "find/create .reiserfs_priv. " "Failing mount."); return -EOPNOTSUPP; |
bd4c625c0
|
845 |
} |
edcc37a04
|
846 847 848 849 |
dentry->d_inode->i_flags |= S_PRIVATE; reiserfs_info(dentry->d_sb, "Created %s - reserved for xattr " "storage. ", PRIVROOT_NAME); |
bd4c625c0
|
850 |
|
edcc37a04
|
851 |
return 0; |
1da177e4c
|
852 |
} |
12abb35a0
|
853 854 855 856 857 858 859 |
#else int __init reiserfs_xattr_register_handlers(void) { return 0; } void reiserfs_xattr_unregister_handlers(void) {} static int create_privroot(struct dentry *dentry) { return 0; } #endif /* Actual operations that are exported to VFS-land */ |
94d09a98c
|
860 |
const struct xattr_handler *reiserfs_xattr_handlers[] = { |
12abb35a0
|
861 862 863 864 865 866 867 868 869 870 871 872 873 |
#ifdef CONFIG_REISERFS_FS_XATTR &reiserfs_xattr_user_handler, &reiserfs_xattr_trusted_handler, #endif #ifdef CONFIG_REISERFS_FS_SECURITY &reiserfs_xattr_security_handler, #endif #ifdef CONFIG_REISERFS_FS_POSIX_ACL &reiserfs_posix_acl_access_handler, &reiserfs_posix_acl_default_handler, #endif NULL }; |
a72bdb1cd
|
874 |
static int xattr_mount_check(struct super_block *s) |
1da177e4c
|
875 |
{ |
a72bdb1cd
|
876 877 |
/* We need generation numbers to ensure that the oid mapping is correct * v3.5 filesystems don't have them. */ |
48b32a355
|
878 879 880 881 882 883 884 885 886 887 |
if (old_format_only(s)) { if (reiserfs_xattrs_optional(s)) { /* Old format filesystem, but optional xattrs have * been enabled. Error out. */ reiserfs_warning(s, "jdm-2005", "xattrs/ACLs not supported " "on pre-v3.6 format filesystems. " "Failing mount."); return -EOPNOTSUPP; } |
a72bdb1cd
|
888 889 890 |
} return 0; |
1da177e4c
|
891 |
} |
10556cb21
|
892 |
int reiserfs_permission(struct inode *inode, int mask) |
b83674c0d
|
893 894 895 896 897 898 899 |
{ /* * We don't do permission checks on the internal objects. * Permissions are determined by the "owning" object. */ if (IS_PRIVATE(inode)) return 0; |
2830ba7f3
|
900 |
return generic_permission(inode, mask); |
b83674c0d
|
901 |
} |
cac36f707
|
902 |
static int xattr_hide_revalidate(struct dentry *dentry, struct nameidata *nd) |
1da177e4c
|
903 |
{ |
cac36f707
|
904 |
return -EPERM; |
1da177e4c
|
905 |
} |
e16404ed0
|
906 |
static const struct dentry_operations xattr_lookup_poison_ops = { |
cac36f707
|
907 |
.d_revalidate = xattr_hide_revalidate, |
1da177e4c
|
908 |
}; |
edcc37a04
|
909 910 911 912 913 914 |
int reiserfs_lookup_privroot(struct super_block *s) { struct dentry *dentry; int err = 0; /* If we don't have the privroot located yet - go find it */ |
c72e05756
|
915 |
reiserfs_mutex_lock_safe(&s->s_root->d_inode->i_mutex, s); |
edcc37a04
|
916 917 918 919 |
dentry = lookup_one_len(PRIVROOT_NAME, s->s_root, strlen(PRIVROOT_NAME)); if (!IS_ERR(dentry)) { REISERFS_SB(s)->priv_root = dentry; |
fb045adb9
|
920 |
d_set_d_op(dentry, &xattr_lookup_poison_ops); |
edcc37a04
|
921 922 923 924 925 926 927 928 |
if (dentry->d_inode) dentry->d_inode->i_flags |= S_PRIVATE; } else err = PTR_ERR(dentry); mutex_unlock(&s->s_root->d_inode->i_mutex); return err; } |
1da177e4c
|
929 930 931 |
/* We need to take a copy of the mount flags since things like * MS_RDONLY don't get set until *after* we're called. * mount_flags != mount_options */ |
bd4c625c0
|
932 |
int reiserfs_xattr_init(struct super_block *s, int mount_flags) |
1da177e4c
|
933 |
{ |
bd4c625c0
|
934 |
int err = 0; |
ab17c4f02
|
935 |
struct dentry *privroot = REISERFS_SB(s)->priv_root; |
bd4c625c0
|
936 |
|
a72bdb1cd
|
937 938 |
err = xattr_mount_check(s); if (err) |
bd4c625c0
|
939 |
goto error; |
bd4c625c0
|
940 |
|
ab17c4f02
|
941 |
if (!privroot->d_inode && !(mount_flags & MS_RDONLY)) { |
ae635c0bb
|
942 |
reiserfs_mutex_lock_safe(&s->s_root->d_inode->i_mutex, s); |
edcc37a04
|
943 |
err = create_privroot(REISERFS_SB(s)->priv_root); |
5a6059c35
|
944 |
mutex_unlock(&s->s_root->d_inode->i_mutex); |
bd4c625c0
|
945 |
} |
ab17c4f02
|
946 947 |
if (privroot->d_inode) { |
48b32a355
|
948 |
s->s_xattr = reiserfs_xattr_handlers; |
c72e05756
|
949 |
reiserfs_mutex_lock_safe(&privroot->d_inode->i_mutex, s); |
ab17c4f02
|
950 951 952 953 954 955 956 957 958 959 960 |
if (!REISERFS_SB(s)->xattr_root) { struct dentry *dentry; dentry = lookup_one_len(XAROOT_NAME, privroot, strlen(XAROOT_NAME)); if (!IS_ERR(dentry)) REISERFS_SB(s)->xattr_root = dentry; else err = PTR_ERR(dentry); } mutex_unlock(&privroot->d_inode->i_mutex); } |
48b32a355
|
961 |
|
a72bdb1cd
|
962 |
error: |
bd4c625c0
|
963 |
if (err) { |
bd4c625c0
|
964 965 966 967 968 |
clear_bit(REISERFS_XATTRS_USER, &(REISERFS_SB(s)->s_mount_opt)); clear_bit(REISERFS_POSIXACL, &(REISERFS_SB(s)->s_mount_opt)); } /* The super_block MS_POSIXACL must mirror the (no)acl mount option. */ |
bd4c625c0
|
969 970 |
if (reiserfs_posixacl(s)) s->s_flags |= MS_POSIXACL; |
ab17c4f02
|
971 |
else |
ab17c4f02
|
972 |
s->s_flags &= ~MS_POSIXACL; |
bd4c625c0
|
973 974 |
return err; |
1da177e4c
|
975 |
} |