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fs/coda/cnode.c
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/* cnode related routines for the coda kernel code (C) 1996 Peter Braam */ #include <linux/types.h> #include <linux/string.h> #include <linux/time.h> #include <linux/coda.h> |
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#include <linux/coda_psdev.h> |
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#include <linux/pagemap.h> |
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#include "coda_linux.h" |
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static inline int coda_fideq(struct CodaFid *fid1, struct CodaFid *fid2) { return memcmp(fid1, fid2, sizeof(*fid1)) == 0; } |
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static const struct inode_operations coda_symlink_inode_operations = { |
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.readlink = generic_readlink, |
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.get_link = page_get_link, |
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.setattr = coda_setattr, }; /* cnode.c */ static void coda_fill_inode(struct inode *inode, struct coda_vattr *attr) { coda_vattr_to_iattr(inode, attr); if (S_ISREG(inode->i_mode)) { inode->i_op = &coda_file_inode_operations; inode->i_fop = &coda_file_operations; } else if (S_ISDIR(inode->i_mode)) { inode->i_op = &coda_dir_inode_operations; inode->i_fop = &coda_dir_operations; } else if (S_ISLNK(inode->i_mode)) { inode->i_op = &coda_symlink_inode_operations; |
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inode_nohighmem(inode); |
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inode->i_data.a_ops = &coda_symlink_aops; inode->i_mapping = &inode->i_data; } else init_special_inode(inode, inode->i_mode, huge_decode_dev(attr->va_rdev)); } static int coda_test_inode(struct inode *inode, void *data) { struct CodaFid *fid = (struct CodaFid *)data; |
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struct coda_inode_info *cii = ITOC(inode); return coda_fideq(&cii->c_fid, fid); |
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} static int coda_set_inode(struct inode *inode, void *data) { struct CodaFid *fid = (struct CodaFid *)data; |
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struct coda_inode_info *cii = ITOC(inode); cii->c_fid = *fid; |
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return 0; } |
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struct inode * coda_iget(struct super_block * sb, struct CodaFid * fid, struct coda_vattr * attr) { struct inode *inode; struct coda_inode_info *cii; unsigned long hash = coda_f2i(fid); inode = iget5_locked(sb, hash, coda_test_inode, coda_set_inode, fid); if (!inode) return ERR_PTR(-ENOMEM); if (inode->i_state & I_NEW) { cii = ITOC(inode); /* we still need to set i_ino for things like stat(2) */ inode->i_ino = hash; |
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/* inode is locked and unique, no need to grab cii->c_lock */ |
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cii->c_mapcount = 0; unlock_new_inode(inode); } /* always replace the attributes, type might have changed */ coda_fill_inode(inode, attr); return inode; } /* this is effectively coda_iget: - get attributes (might be cached) - get the inode for the fid using vfs iget - link the two up if this is needed - fill in the attributes */ |
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struct inode *coda_cnode_make(struct CodaFid *fid, struct super_block *sb) |
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{ struct coda_vattr attr; |
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struct inode *inode; |
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int error; /* We get inode numbers from Venus -- see venus source */ error = venus_getattr(sb, fid, &attr); |
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if (error) return ERR_PTR(error); |
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inode = coda_iget(sb, fid, &attr); if (IS_ERR(inode)) |
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pr_warn("%s: coda_iget failed ", __func__); |
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return inode; |
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} |
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/* Although we treat Coda file identifiers as immutable, there is one * special case for files created during a disconnection where they may * not be globally unique. When an identifier collision is detected we * first try to flush the cached inode from the kernel and finally * resort to renaming/rehashing in-place. Userspace remembers both old * and new values of the identifier to handle any in-flight upcalls. * The real solution is to use globally unique UUIDs as identifiers, but * retrofitting the existing userspace code for this is non-trivial. */ |
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void coda_replace_fid(struct inode *inode, struct CodaFid *oldfid, struct CodaFid *newfid) { |
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struct coda_inode_info *cii = ITOC(inode); |
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unsigned long hash = coda_f2i(newfid); |
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BUG_ON(!coda_fideq(&cii->c_fid, oldfid)); |
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/* replace fid and rehash inode */ /* XXX we probably need to hold some lock here! */ remove_inode_hash(inode); cii->c_fid = *newfid; inode->i_ino = hash; __insert_inode_hash(inode, hash); } /* convert a fid to an inode. */ struct inode *coda_fid_to_inode(struct CodaFid *fid, struct super_block *sb) { struct inode *inode; unsigned long hash = coda_f2i(fid); if ( !sb ) { |
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pr_warn("%s: no sb! ", __func__); |
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return NULL; } |
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inode = ilookup5(sb, hash, coda_test_inode, fid); |
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if ( !inode ) return NULL; /* we should never see newly created inodes because we intentionally * fail in the initialization callback */ BUG_ON(inode->i_state & I_NEW); return inode; } /* the CONTROL inode is made without asking attributes from Venus */ |
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struct inode *coda_cnode_makectl(struct super_block *sb) |
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{ |
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struct inode *inode = new_inode(sb); if (inode) { inode->i_ino = CTL_INO; inode->i_op = &coda_ioctl_inode_operations; inode->i_fop = &coda_ioctl_operations; inode->i_mode = 0444; return inode; |
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} |
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return ERR_PTR(-ENOMEM); |
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} |