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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 2 | pj | 1 | |
| 2 | #include <fs/types.h> |
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| 3 | #include <fs/errno.h> |
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| 4 | #include <fs/task.h> |
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| 5 | #include <fs/maccess.h> |
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| 6 | #include <fs/fcntl.h> |
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| 7 | |||
| 8 | #include "file.h" |
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| 9 | #include "inode.h" |
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| 10 | #include "dentry.h" |
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| 11 | #include "fileop.h" |
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| 12 | #include "fsconst.h" |
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| 13 | #include "fs.h" |
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| 14 | |||
| 15 | /* NB: alcune operazioni sui files vanno fatte in mutua esclusione */ |
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| 16 | |||
| 17 | /* to FIX: |
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| 18 | * -- fd == 0,1,2 then we must write on teminal |
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| 19 | * (must be integrated better) |
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| 20 | */ |
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| 21 | #include <ll/i386/cons.h> |
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| 22 | |||
| 23 | __ssize_t k_write(int fd, __ptr_t buf, __ssize_t nbytes) |
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| 24 | { |
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| 25 | __pid_t pid; |
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| 26 | __ssize_t sz; |
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| 27 | |||
| 28 | call_to_fs(); |
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| 29 | |||
| 30 | /* TO FIX! */ |
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| 31 | if (fd>=0&&fd<=2) { |
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| 32 | __ssize_t x; |
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| 33 | char *c; |
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| 34 | |||
| 35 | //printk(KERN_INFO "writing on console with fd=%i",fd); |
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| 36 | |||
| 37 | /* WARNING buf is a pointer into user-space |
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| 38 | * we are using it without cast |
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| 39 | */ |
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| 40 | |||
| 41 | /* WARNING cputc is called without mutex |
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| 42 | * lock |
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| 43 | */ |
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| 44 | |||
| 45 | if (fd==0) return_from_fs(-EBADF); |
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| 46 | |||
| 47 | c=(char*)buf; |
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| 48 | x=nbytes; |
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| 49 | while (x-->0) cputc(*c++); |
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| 50 | |||
| 51 | return_from_fs(nbytes); |
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| 52 | } |
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| 53 | |||
| 54 | /* don't try to use a bad file descriptor */ |
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| 55 | pid=__get_pid(); |
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| 56 | if (check_fd(pid,fd)) { |
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| 57 | printk(KERN_INFO "k_write: using bad file descriptor"); |
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| 58 | return_from_fs(-EBADF); |
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| 59 | } |
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| 60 | |||
| 61 | /* don't try to write a directory */ |
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| 62 | if (file_ptr(pid,fd)->f_flag_isdir) return_from_fs(-EBADF); |
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| 63 | |||
| 64 | /* don't try to write from not user memory */ |
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| 65 | if (!__verify_write(buf,nbytes)) return_from_fs(-EVERIFY); |
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| 66 | |||
| 67 | /* if in read only mode (errno OK?)*/ |
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| 68 | if (*fildesfflags_ptr(pid,fd)&O_RDONLY) |
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| 69 | return_from_fs(-EPERM); |
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| 70 | |||
| 71 | /* cancellation point */ |
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| 72 | //fs_test_cancellation(-EINTR); |
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| 73 | |||
| 74 | /* acquire write lock on inode's file */ |
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| 75 | __rwlock_wrlock(&file_ptr(pid,fd)->f_dentry->d_inode->i_lock); |
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| 76 | |||
| 77 | if (*fildesfflags_ptr(pid,fd)&O_APPEND) |
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| 78 | if (file_ptr(pid,fd)->f_pos!= |
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| 79 | file_ptr(pid,fd)->f_dentry->d_inode->i_st.st_size) { |
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| 80 | __off_t off; |
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| 81 | off=file_ptr(pid,fd)->f_op->lseek(file_ptr(pid,fd),0,SEEK_END); |
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| 82 | if (off!=file_ptr(pid,fd)->f_dentry->d_inode->i_st.st_size) { |
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| 83 | sz=-ESPIPE; |
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| 84 | goto SKIP; |
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| 85 | } |
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| 86 | } |
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| 87 | |||
| 88 | /* WARNIG buf is a pointer into user-space */ |
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| 89 | sz=file_ptr(pid,fd)->f_op->write(file_ptr(pid,fd),buf,nbytes); |
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| 90 | |||
| 91 | /* release the lock */ |
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| 92 | SKIP: |
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| 93 | __rwlock_wrunlock(&file_ptr(pid,fd)->f_dentry->d_inode->i_lock); |
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| 94 | |||
| 95 | return_from_fs(sz); |
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| 96 | } |